JP5338457B2 - Lawn mower mower deck - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mower deck for a lawn mower which is compatible with either of rear discharge mode and mulching mode. <P>SOLUTION: The mower deck 3 for a lawn mower includes the following configuration: a sealing section 5 defining the upper part of rotating areas where left and right two rotating blades 2 for lawn mowing rotate standing against each other within a mutually interferential range and a circumferential wall section 6 defining the outer circumference of the rotating area, are integratedly formed; and left and right inlet guides 7 functioning to guide cut grasses from the left and right respective rotating areas to their joining position and outlet guides 9 for rear discharging use functioning to guide cut grasses from the joining position to a discharge port 8 opened high at the backside position of the circumferential wall section 6 are made to communicate with each other. In the deck, the left and right inlet guides 7 and the outlet guides 9 include: attachment members 4 each composed of a flat sealing plate 11 defining the upper part of the rotating areas at a height common to that of the sealing section 5 and a discharge port circumferential wall plate 12 defining the outer circumference of the rotating areas and closing the discharge port 8, respectively. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a mower deck that covers two left and right rotating blades of a lawn mowing device for high-performance rear discharge that can mow a wide range of lawn mowing widths at high speed and uniformly.

  It is a lawn mower with rear discharge specifications that is mounted so that it hangs between the wheelbases of the aircraft that can run on turf, and that discharges the rear so that the cutting pieces are accumulated in the collector at the rear of the aircraft, which is a grass collector. There is known a structure that can be diverted to a mulching specification in which the cutting pieces are dropped and accumulated as they are.

  For example, in the example of the lawn mowing apparatus of Patent Document 1, the two right and left rotating blades for lawn mowing are opposed to each other within the mutual interference range to enable uniform mowing over a wide range of lawn mowing widths, and to cover both the rotating blades. A sealing part that defines the upper part of the rotation area and a peripheral wall part that defines the outer periphery of the rotation area are integrally formed, and a high-level opening is made from the merging position of both rotation areas to the rear position of the peripheral wall part beyond the sealing part. A mower deck having a discharge guide body for rear discharge that guides the cutting piece to the delivery port is provided.

  The delivery guide body can efficiently feed the cutting pieces to the stacking part for rear discharge by guiding the cutting pieces from the merging position of both rotation regions to the delivery port of the back surface. By attaching the cover member so as to be closed and switching to the mulching specification, the cut pieces can be dropped and deposited as they are within the lawn mowing width.

JP 2005-31314 A

However, in the case of a high-performance lawn mower capable of high-speed mowing, the delivery guide body includes not only the central junction, but also the left and right introduction guide bodies that extend to both rotation areas. Even when switching to the mulching specification, a hollow due to the introduction guide body remains, and there is a problem that it becomes difficult to uniformly disperse the cutting pieces by collecting the cutting pieces in this depression and dropping them into a nodule shape. .
Therefore, high-performance lawn mowers equipped with an introduction guide body are more expensive by inventory and individual management of large parts by specification in order to meet the mulching specification, which has limited market demand compared to the rear discharge specification. The problem of inviting was included.

  An object of the present invention is to provide a mower deck of a high-performance lawn mower capable of supporting both rear discharge specifications and mulching specifications.

The invention according to claim 1 integrally forms a sealing part that defines the upper part of the rotating area in which the two right and left rotating blades for lawn mowing rotate opposite to each other within the mutual interference range and a peripheral wall part that defines the outer periphery of the rotating area. The left and right introduction guide bodies for guiding the cutting pieces from the left and right rotation areas to the joining position, and the discharge guide for rear discharge that guides the cutting pieces from the joining position to the outlet opening at a high position at the rear position of the peripheral wall portion. In the mower deck of the lawn mower that is formed in communication with the body, a flat sealing plate that is closed with the corresponding shape of each of the left and right introduction guide bodies and the delivery guide body, and that defines the upper part of the rotation area at the same height as the sealing part. provided, the portions corresponding to the delivery guide body of the flat sealing plate, fitted with a feed port wall plate to close the outlet defining the outer periphery of the rotation range, flat sea phosphorus Plates and outlet wall plate, characterized by an attachment member for removably constituted by fasteners connecting portion between the sealing portion and the peripheral wall portion.

Guide the cutting pieces harvested by the left and right rotating blades by the left and right introduction guide bodies from each rotation area to the joining position, and then guide the delivery guide body to the delivery opening that opens to the rear position of the peripheral wall portion. From the above, the cutting pieces are efficiently fed to the rear discharge accumulating section, and on the other hand, by providing a flat sealing plate and a delivery outlet peripheral wall plate, the upper and outer circumferences of both rotation areas are defined. Since the cutting pieces fall as they are, the cutting pieces are uniformly deposited over the entire width of the lawn mowing so that there is no concentrated fall due to the mulching mower as the cutting pieces are accumulated in the depressions of the sealing portion.
Since the attachment member can be attached and detached with a fastener, the rear discharge specification and the mulching specification can be easily switched and changed.

According to a second aspect of the present invention, in the configuration of the first aspect, a pair of left and right curved plates are formed at the arc-shaped intersection of the front peripheral wall portion of the deck of the mower deck, and the left and right width direction is formed at the left and right joint portions of the curved plate. A notch release portion is formed in the lower half, and the front peripheral wall plate that closes the notch release portion is attached to the flat sealing plate .

The mower deck according to claim 1 is provided with an attachment member composed of a flat sealing plate and a delivery outlet peripheral wall plate on a mower deck with a high performance rear discharge specification, so that the cutting pieces fall as they are in each rotation region. Since the outer periphery is defined, it does not cause a concentrated fall due to partial accumulation of the cutting pieces, and functions as a high-performance mulching mower in which the cutting pieces are uniformly deposited over the entire width of the lawn mowing without cutting. With a simple attachment member made up of a flat sealing plate and a delivery outlet peripheral wall plate, it is possible to cope with the production of both specifications while reducing the large inventory cost required for the production of a large-size member of a plurality of specifications.
Further, since the attachment member can be attached and detached with a fastener, the rear discharge specification and the mulching specification can be easily switched and changed.
Further, since the flat sealing plate 11 closes the left and right introduction guide bodies 7 and the delivery guide body 9 of the mower deck 3 and the delivery outlet peripheral wall plate 12 closes the delivery outlet 8 side, the left and right rotary blades 2 and 2 rotate. The cutting pieces can be dropped and accumulated in the area, and the rear discharge specification mower deck 3 can be diverted to the mulching specification.
In this case, the mower deck 3 is a flat sealing plate in which the left and right introduction guide bodies 7 and 7 and the subsequent delivery guide body 9 have the same height as the sealing portion 5 by the attachment member 4 for making the mulching specification. 11 is flattened, so that partial accumulation of the cutting pieces can be avoided, and the cutting pieces can be uniformly deposited over the entire width of the lawn mowing without uncut cutting without incurring the concentrated fall of the cutting pieces. Acts as a mulching mower.

In addition to the effect of claim 1, the mower deck of claim 2 has a configuration in which the front peripheral wall plate 15 is applied to the notch release portion 3E of the left and right arc-shaped intersection 3D portion of the mower deck 3 to close the front side during mulching work. Can prevent scattering of how to cut .

Plan view of the midmore apparatus of the present invention Exploded perspective view of mower deck Top view (a) and side view (b) of attachment member Plan view (a), side view (b), and S1-S1 line sectional view (c) of the right rotating blade Front view of the transmission system of the Midmore device Side view of the discharge duct Disassembled perspective view with internal perspective display of collector The perspective view of the mounting state by the internal perspective display of the collector of FIG. Side view of container unfolding up The exploded perspective view by the internal perspective display of the container of another composition example Side view of lawn mower with mid-more tractor Perspective view of lawn mower

Embodiments specifically configured based on the above technical idea will be described below with reference to the drawings.
Lawnmower mid mower 1 is attached to the tractor, which is an example of a lawnmower apparatus of the present invention, as shown in the side view of FIG. 11, a mid-mower in a form attached to the abdomen of the body 102, the body 102, a front wheel 110 110, rear wheels 106, 106, a steering wheel 111 for steering the front wheels 110, 110, a driver's seat 112, an engine 113, a floor 114, and the like. A power take-off shaft 115 for taking out the power of the engine 113 is provided below the floor 114 in the front-rear direction. Power of the power take-off shaft 115 is transmitted to the input shaft 117 of mower 1 through the transmission belt 116, and transmitted to the blade shaft 118, 118 is provided from the input shaft 117 to the right and left side portions of the mower deck 3 blade 2,2 Cuts turfgrass counterclockwise around the vertical axis. A travel transmission shaft 120 is connected to the rear portion of the power take-off shaft 115, and the rear wheels 106 and 106 are driven through a transmission case 121 and a hydraulic continuously variable transmission (HST) 122.

Forming a grass collection port 8 at the center rear of the mower deck 3. The grass collection port 8 communicates with a collector 109 attached to a rear frame 108 at the rear end of the vehicle body 102 via a duct 7 between the left and right rear wheels 106 and 106.
A collector 109 is mounted on a rear frame 108 at the rear end of the vehicle body 102 via a mounting bracket 123. The mounting bracket 123 is configured to support a collector pivot shaft 124 having a horizontal axis serving as a pivot shaft of the collector 109.

  The collector 109 is surrounded by an air-permeable net N at the upper and lower surfaces, the left and right surfaces, and the rear surface of the net frame 126 formed in a box shape in the vertical and horizontal directions. The front surface of the collector 109 is not covered with the ventilation net N, and an open portion G is formed so as to correspond to the rear surface of the rear frame 108. The opening G is configured to communicate with the duct opening at the end of the duct 107 connected to the rear frame 108.

The blades 2 and 2 of the mower 1 cut the turf and generate air, and the cut turfgrass passes through the duct 7 and passes through the duct opening at the end and the opening G of the collector 109 into the collector 109. Drain and store. And the ventilation which conveyed the turf grass is exhausted from the ventilation net | network N. FIG.

  A rotation operation lever 130 for rotating the collector 109 is provided at the front part on the left and right sides of the collector 109. When the collector 109 is in a working position for receiving and accommodating the cut grass, the pivot operation lever 130 is in a vertically long posture and is a pair of upper and lower lever supports (not shown) formed on a pivot plate (not shown). The rotation operation lever 130 is configured to be slidable in the longitudinal direction. When the operator operates the rotation operation lever 130, the operator grips the upper portion of the rotation operation lever 130 and rotates it forward.

Mid mower 1, as shown in the perspective view of FIG. 12, left and right two rotating blades 2,2 for lawn, covers these rotating blades 2,2, on a collection of cutting pieces in the middle, the rear The rear discharge mower deck 3 is guided to the extending shooter. As shown in FIG. 1, a plan view including a partial cross section of the mower deck 3 can be equipped with an attachment member 4 for diverting to a mulching specification in which a cutting piece is dropped and accumulated in the rotation region of the left and right rotary blades 2 and 2. Configure.

  The two rotating blades 2 and 2 are arranged with a phase difference of 90 degrees so that they can rotate oppositely in a mutual interference range in the same plane in order to uniformly cut the entire width over a wide cutting range. The mower deck 3 integrally includes a sealing portion 5 that forms a ceiling portion that defines an upper portion of the rotation region of the rotary blades 2 and 2, and a peripheral wall portion 6 that defines the outer periphery of the rotation region together with a flange 6a on the outer periphery of the lower surface. The left and right introduction guide bodies 7 and 7 for guiding the cutting pieces to the joining position from the respective rotation areas beyond the sealing part 5 and the delivery opening 8 that opens from the joining position to the back position of the peripheral wall 6. A rear discharge delivery guide body 9 that guides the cutting piece is formed so as to gradually rise from the sealing portion 5.

  Although the mower deck 3 is formed by pressing, it is pressed in two stages. In the first stage, a draw is formed substantially along an elliptical shape, and then in the second stage, along the left and right rotating blades 2, 2. Deep drawing is formed in a letter shape. For this reason, the flange 6a is formed on the stage 3A, the stage 3B during the first stage press, and the ceiling stage 3C during the second stage press. When the ceiling stage 3C is formed during the second stage pressing, the sealing part 5, the introduction guide body 7 and the delivery guide body 9 are formed.

  Further, on the front side of the mower deck 3, a pair of left and right curved plates 3E, 3E are applied integrally by welding so that the left and right arc-shaped intersecting portions 3D are suspended from the flange portion. And the notch release part 3F is formed in the right-and-left width direction in the right-and-left width direction and the notch release part 3F in the lower half part in the right-and-left joining part of these bending plates 3E and 3E. Further, a substantially triangular notch 3G is formed on the front side of the stage 3B during the first stage pressing. 3H and 3H are reinforcing plates of the curved plates 3E and 3E. Therefore, the turfgrass to be vegetated is deeply laid down by the flange portion 6a and the stage 3B. However, since the turfgrass enters the mower deck 3 through the triangular cutout 3G and the cutout release portion 3G, the turfgrass does not fall deeply and rotates. The blades 2 and 2 do not cut the sky, and no uncut leaves are produced.

  The attachment member 4 is sealed above the rotational area of the rotary blades 2 and 2 as shown in an exploded perspective view of the mower deck in FIG. 2 by reversing the top and bottom and a plan view (a) and a side view (b) in FIG. A flat sealing plate 11 defined at a common height with the portion 5, a delivery outlet peripheral wall plate 12 defining the delivery outlet 8 side, and a notch release portion 3G of the arcuate intersection 3D of the deck front peripheral wall portion 15 are defined. And a front peripheral wall plate 15 formed.

The flat sealing plate 11 is formed in a shape corresponding to each of the left and right introduction guide bodies 7 and the delivery guide body 9 so as to close them. For connection with the mower deck 3, left and right connection parts 13, 13 for the sealing part 5, a rear connection part 14 for the peripheral wall part 6, and a front connection part 15 a formed in a step shape are provided. In particular, the rear connection portion 14 is detachably connected and fixed to the flange 6a of the peripheral wall portion 6 by a co-fastener 16 using a bolt that suppresses the downward protrusion. Furthermore, among the front side connection parts 15a of the side view staircase type that connects the front peripheral wall plates 15 in the left and right communication state, the upper side plane part is superposed on the stage 3B from the lower side and both are fastened and fixed.
The attachment member 4 is attached and detached by turning the mower deck 3 upside down.

  The mower deck 3 configured as described above passes the cutting pieces cut by the two right and left rotary blades 2 and 2 from the respective rotation areas to the sealing portion 5 by the left and right introduction guide bodies 7 and 7 and the delivery guide body 9 subsequent thereto. Then, the delivery guide body 9 guides to the delivery outlet 8 which opens to the rear position of the peripheral wall portion 6 at a high position, so that it is possible to constitute a lawn mowing apparatus with a rear discharge specification. By attaching the member 4, that is, by fixing the left and right connection parts 13, 13 to the sealing part 5, and the rear side connection part 14 and the front side connection part 15 to the peripheral wall part 6, the flat sealing plate 11 is attached to the mower deck 3. Since the left and right introduction guide bodies 7 and the delivery guide body 9 are closed, and the delivery outlet peripheral wall plate 12 closes the delivery outlet 8 side, the cutting piece is placed in the rotation region of the left and right rotary blades 2 and 2. Can be directly dropped deposition, she is possible to divert the mower deck 3 of the rear discharge specifications mulching specifications.

  In this case, the mower deck 3 has a flat sealing in which the range of the left and right introduction guide bodies 7 and 7 and the subsequent delivery guide body 9 is the same as that of the sealing portion 5 by the attachment member 4 for diverting to the mulching specification. Since the plate 11 is flatly defined, partial accumulation of the cutting pieces can be avoided, and the cutting pieces can be uniformly deposited over the entire width of the lawn mowing without uncut cutting without incurring the concentrated fall of the cutting pieces. Functions as a mulching mower that can. In the present embodiment, the front peripheral wall plate 15 is also applied to the notch release portion 3E of the left and right arc-shaped intersection portion 3D of the mower deck 3 so as to prevent the cutting pieces from scattering to the front side.

  Therefore, the mower deck with high performance rear discharge specifications can be diverted to the mulching specification while ensuring its lawn mowing performance by the configuration of the mower deck, so the simple attachment member with the flat sealing plate and the outlet peripheral wall plate can be used according to the specifications. Both specifications can be accommodated while reducing the large inventory costs required for the production of large-sized parts. Such a structure of the mower deck is not limited to the above-described mid mower but can be commonly applied as a lawn mower for the front mower.

  For the left and right rotary blades 2 and 2, as shown in FIG. 4, a plan view (a), a side view (b) of the right rotary blade, and a sectional view (c) taken along line S 1 -S 1 in the plan view A single-edged blade 21 for lawn mowing is formed on the front edge, an inclined part 22 for raising the cutting piece is formed on the rear edge, and an inclined part 23 for pressing is provided on the inner peripheral position of the single-edged blade 21. By configuring the blades corresponding to the rotation direction and replacing the left and right blades with dedicated blades, the rear discharge mower deck having a thin configuration can be used as a high performance lawn mower with a mulching specification.

(Transmission system)
The transmission system of the lawn mower shown in FIG. 5 has a front PTO configuration in which the input to the mower is located on the front side of the mower deck, and shows a configuration different from the rear PTO transmission system of FIG. 1 arranged on the rear side of the mower deck. As shown in FIG. 5, in a configuration in which center input is received from the front PTO, a gear case 31 that transmits rotational power to the rotary blade 2 on one side is cantilevered so as to project high above the delivery guide body 9. 31 is provided with a center-arranged input shaft 32 to receive the center input, and in order to transmit rotational power from the input shaft 32 to the rotating blade 2 on the other side, a timing belt mechanism 34 by a gear transmission pulley shaft 33 is configured. To do.

  By constructing the transmission system of the lawn mower as described above, full width cutting by the left and right rotating blades 2 and 2 arranged close to each other with constant phase difference rotation and high level discharge by the delivery guide body 9 can be secured, so that the discharge performance of the rear discharge is improved. While maintaining the power transmission system, the transmission system can be simplified and the bending angle of the transmission axis of the front PTO can be reduced, so that the universal joint connected to the center-arranged input shaft 32 can be reduced in noise and improved in durability. Can do. Further, as another transmission configuration, when compared with a side transmission configuration that requires a member that is displaced from the center to receive transmission from the front of one rotary blade shaft (for example, JP 2008-29287 A), With the above configuration, the number of transmission members is small and the configuration can be made at low cost.

(Exhaust duct)
Next, the exhaust duct communicating with the lawn mower is configured so that the discharge stream line faces one side of the fuselage in a plan view. On the left side wall, as shown in the side view of FIG. 6, an opening 43 serving both as an air intake and a maintenance port is formed, and a lid 44 capable of adjusting the opening is provided.

  In general, in the configuration in which the streamline of the discharge duct 41 is directed to one side in a plan view, the cutting piece is guided and sent along the outer wall that is closer to the outer side of the fuselage. By forming the opening 43 as an air inlet, it is possible to improve the conveying capacity, and when the cutting piece is clogged in the duct, the cutting piece can be easily removed from the opening 43, More efficient mower work can be achieved.

(collector)
Next, with respect to the collector following the discharge duct, as shown in the exploded perspective view with the internal perspective display in FIG. 7 and the perspective view with the internal perspective display in the attached state in FIG. The handle 53 and the fulcrum-carrying spring-type holding mechanism 54 are configured to be held open. Reference numeral “55” denotes a guide plate.

By configuring as described above, when the container 51 is deployed and raised rearward, as shown in the operation side view of FIG. 9, by ensuring a large ground clearance H in the space below the container, Maintenance operations such as checking the discharge duct 41 and removing the clogged cutting pieces are facilitated.

  Further, as shown in the exploded perspective view of the internal perspective display in FIG. 10, a guide plate 55 is extended from the container deployment frame side, and the bottom plate 56 of the collector 51 is cut out in the range of the extension dimension A as shown in FIG. By forming B and moving the position of the lower mating surface to the rear, it is possible to secure a large ground height H when the container 51 is deployed and raised rearward in the same manner as described above.

DESCRIPTION OF SYMBOLS 1 Lawn mower 2 Rotating blade 3 Mower deck 4 Attachment member 5 Sealing part 6 Peripheral wall part 7 Introduction guide body 8 Outlet 9 Outlet guide body 11 Flat sealing board 12 Outlet peripheral wall board 13 Connection part 14 Rear connection part 15 Front peripheral wall board 16 Fastener

Claims (2)

The right and left rotating blades (2) for lawn mowing are integrally formed with a sealing part (5) that defines the upper part of the rotating area facing and rotating in the mutual interference range and a peripheral wall part (6) that defines the outer periphery of the rotating area. The left and right introduction guide bodies (7) for guiding the cutting pieces from the left and right rotation areas to the joining position over the sealing part (5), and the rear position of the peripheral wall (6) from the joining position In the mower deck of the lawn mower apparatus in which the discharge guide body (9) for rear discharge that guides the cutting piece to the opening (8) that opens is communicated,
A flat sealing plate (11) that is closed with the corresponding shapes of the left and right introduction guide bodies (7) and the delivery guide bodies (9) and defines the upper part of the rotation area at a common height with the sealing part (5). Provided,
A portion corresponding to the delivery guide body (9) of the flat sealing plate (11 ) is attached with a delivery outlet peripheral wall plate (12) that defines the outer periphery of the rotation region and closes the delivery outlet (8) ,
The flat sealing plate (11) and the delivery outlet peripheral wall plate (12) are used as an attachment member (4) configured such that a connecting portion between the sealing portion (5) and the peripheral wall portion (6) is detachable by a fastener. The mower deck of the lawn mower characterized. A pair of left and right bent plates (3E, 3E) are formed at the arc-shaped intersection (3D) of the front peripheral wall portion (15) of the deck of the mower deck (3), and the left and right joint portions of the bent plates (3E, 3E) are formed. Forms a notch release part (3F) in the lower half part across the width direction,
The mower deck of a lawn mower according to claim 1, wherein the front peripheral wall plate (15) for closing the notch release portion (3G) is attached to the flat sealing plate (11) .

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