JP2008182997A - Lawn mower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lawn mower provided with a mower deck which is free from a fear of accumulation of mown turfgrass on a connecting part of a body part and a straight discharging part of a central rear end part. <P>SOLUTION: The mower is provided with a shooter 14 connected with a guide 16b which is a straight discharging part installed on the central rear end part of the body 16a of the mower deck 16, a pair of mowing blades 5, 5 for mowing turfgrass each parallelly mounted in the body 16a, 16a, and inward rotating each blade 5, 5 around a vertical shaft and constituted to guide the turfgrass to the guide 16b, wherein the turfgrass blocked in the connecting part 16x of the body 16a and the guide 16b are removed by turfgrass removing means 45, 46, 48. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a riding or walking lawn mower that cuts turf grass or weeds (hereinafter referred to as turf grass).

  Conventionally, a riding lawn mower has been provided with a pair of left and right cutting blades, the left and right cutting blades are out of phase and rotated inward with a part of the rotation region partially overlapped, and at least in front of the left and right cutting blades. Is known that is covered with a mower deck having a cylindrical portion formed in an arc shape along the outer periphery of the rotation locus of the cutting blade.

The lawn mower has a cylindrical section with a mower deck that follows the outer circumference of the cutting locus of the mowing blade in order to efficiently discharge the wind generated by the rotation of the mowing blade to the rear collector. The rotating area for rotating the right and left cutting blades inwardly with each other partially overlaps, and at the central rear end of the cylindrical part, there is a rectilinear discharge part for discharging the cut turf grass backward. It is often used.
Japanese Patent Laying-Open No. 2005-323549 (FIG. 4)

In many cases, the turfgrass that has been cut out accumulates at the connecting portion between the cylindrical portion of the conventional mower deck structure and the straight discharge portion at the center rear end thereof, so that the turfgrass cutting operation cannot be continued.
The subject of this invention is providing the lawn mower provided with the mower deck which there is no possibility of the turfgrass harvested in the connection part of the said cylindrical part and the rectilinear discharge part of the center rear end part being accumulated.

The above-described problems of the present invention are solved by the following solution means.
According to the first aspect of the present invention, a mower (6) having a mower deck (16) having a pair of cutting blades (5, 5) for cutting turfgrass and a turfgrass cut by the mower (6) are conveyed. The mower deck (16) includes a left and right cylindrical portion (16a, 16a) and a guide guide (16b) which is a rectilinear discharge portion at the center rear end in a plan view. The cutting blades (5, 5) are arranged in parallel in the cylindrical portions (16a, 16a), and the cutting blades (5, 5) are rotated inwardly around the vertical axis to guide the guide guide (16b). The guide guide (16b) is connected to the shooter (14), and the turf grass clogged in the connection portion (16x, 16x) between the cylindrical portion (16a, 16a) and the guide guide (16b) is provided. Turf grass removing means for removal (45, 46 The connecting portion 48) (16x, a lawn mower equipped with a 16x).

The invention as set forth in claim 2 is provided with lifting means for raising and lowering the mower (6), and the lifting means is provided with an interlocking mechanism (such as 47) interlocking with the turfgrass removing means (48). It is a lawn mower.
The invention described in claim 3 is the lawn mower according to claim 1, further comprising an attaching / detaching mechanism (14a1, 14a2, 14b1, 14c1) that can attach and detach the intermediate part of the shooter (14) from the lawn mower body with one touch.

  According to the first aspect of the present invention, the turfgrass harvested by the mower (6) is collected in the connecting portion between the cylindrical portion (16a) of the mower deck (16) and the guide guide (16b) while being transported to the collector (15). Easy turfgrass can be easily removed by the turfgrass removal means (45, 46, 48).

  According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, the turfgrass removing means (48) operates in conjunction with the raising / lowering of the mower (6). The turfgrass can be easily removed by the turfgrass removing means (48) from the connecting portion between the cylindrical portion (16a) and the guide guide (16b).

  According to the invention of claim 3, in addition to the effect of the invention of claim 1, the middle part of the shooter (14) can be detached from the lawn mower body with one touch, so that the shooter (14) can be detached from the airframe. After that, turfgrass adhering to the inside of the shooter (14) can be easily removed.

Embodiments of the present invention will be described below with reference to the drawings.
A left side view of the riding lawn mower of the present embodiment is shown in FIG. 1A, a partial drive mechanism diagram thereof is shown in FIG. 1B, and a plan view thereof is shown in FIG. In the present invention, the left and right directions in the forward direction of the lawn mower are referred to as the left side and the right side, respectively, the forward direction is referred to as the front side, and the reverse direction is referred to as the rear side.

Turfgrass having front wheels 3, 3 and rear wheels 4, 4 at the front and rear of the traveling machine body, and a cutting blade 5 between the front wheels 3, 3 and the rear wheels 4, 4 below the front part of the machine body A mower 6 for mowing is provided, a steering column 8 is erected on the floor 7 above the front of the machine body, and a handle 10 is provided on the upper portion of the column 8. A steering seat 11 is provided at the rear of the handle 10, a not-shown engine is provided at the front of the aircraft, and a mission case 12 having a hydrostatic continuously variable transmission (HST) is provided below the cockpit 11. Is provided.
In the HST, the motor output is guided into the mission case 12, and the output decelerated by a predetermined gear shift drives the left and right rear wheels 4, 4 through an unillustrated differential mechanism.

  Further, the turf grass cut by the cutting blade 5 in the pair of cylindrical portions 16a partially overlapping at the central portion of the mower deck 16 is guided to the short cylindrical guide guide 16b from the discharge port at the rear central portion of the mower deck 16, The air is conveyed to the rear collector 15 via the shooter 14 connected to the guide guide 16b.

  The cutting blade 5 has a blade edge 5A on the front side of the rotation and a wind wing 5B on the rear side of the rotation. The turf grass cut by the blade edge 5A is carried around by the wind wing 5B and guided to the shooter 14 from the guide duct 16b at the rear of the deck. The wind generated by the rotation of the cutting blade 5 is configured to blow the turf grass to the rear collector 15.

  Further, since the imaginary line connecting the rotation axes (38, 40) of the cutting blades 5, 5 is inclined with a predetermined angle with respect to the longitudinal direction of the machine body, it is within a predetermined width dimension orthogonal to the traveling direction. Can be provided with the large-diameter cutting blades 5 and 5, and the mower 6 having high cutting ability can be configured.

A transmission shaft 20 that receives power from an engine (not shown) shown in the side view of FIG. 1A is connected to an input shaft 22 that protrudes forward from a transmission case 21 disposed below the cockpit 11. .
The transmission case 21 is provided with a first output shaft 24 projecting downward via a bevel gear mechanism therein and a second output shaft 25 projecting rightward (FIG. 2).

  1B shows the interlocking relationship between the vertical axes 26 and 27 driven by the first output shaft 24. As shown in FIG. A transmission belt 29 is wound around the pulley 24a fixed to the first output shaft 24 through pulleys 26a and 27a fixed to the vertical axes 26 and 27, respectively. The vertical axis 26 is the rotation axis of the HST cooling fan 30, and the vertical axis 27 is the HST pump axis.

  A transmission belt 34 is wound around a pulley 25 a provided on the second output shaft 25 and an input pulley 32 a provided on the center side of the transmission case 31 on the right side of the mower deck 16. The transmission belt 34 is tensioned or relaxed by a tension pulley 35 that is operated by operating the clutch lever 51.

  The transmission configuration of the mower 6 will be described. The driving force of the input pulley 32a is transmitted to the vertical axis 37 and is transmitted by a gear 37a provided on the vertical axis 37 and a gear 38a meshing with the gear 37a. Turn forward. In addition, a pulley 37b is fixed to a portion of the vertical axis 37 that supports the gear 37a that protrudes to the outside of the mower deck 16, and a pulley 40a that is fixed from the pulley 37b to the second cutting blade shaft 40 is interlocked by a belt 41. The second cutting blade shaft 40 is reversed in the direction of arrow B. At this time, the belt 41 is stretched over the tension pulley 42 provided on the outer side of the mower deck 16, and the belt 41 is tensioned or relaxed by the tension pulley 44 at the tip of the tension arm 43 supported on the outer surface of the mower deck 16. The first and second cutting blade shafts 38 and 40 are equipped with cutting blades 5 and 5, respectively.

  3 shows a plan layout of the pulleys 38a and 40a, the belt 41, and the tension pulley 42. By using both the shaft center 42a of the tension pulley 42 and the shaft center 43a of the tension arm 43, the cost can be reduced. Can do. That is, in order to prevent the tension belt 41 from being disposed on the upper bulging portion of the upper surface of the mower deck 16, a tension pulley 42 is provided so as to have a letter-like shape in plan view. The axial center 43a of the tension arm 43 for tension or relaxation is made to coincide. With this configuration, it is not necessary to provide two axial center configurations, and the configuration can be simplified.

  The mower deck 16 is easily trapped and accumulated on the connecting portion 16x (see FIG. 4) between the cylindrical portion 16a and the straight discharge portion (guide guide) 16b at the center rear end of the mower deck 16 in a plan view. Although there is a possibility that the cut turfgrass cannot be transported, the mower deck 16 of the present embodiment can employ several configurations as follows to prevent this.

  First, in the configuration example shown in the perspective view of the moor deck 16 in FIG. 4, the side plates 45, 45 provided on the left and right inner walls of the guide guide 16b are rotated in a double-spread manner so that the inner wall of the guide guide 16b is securely jammed. This configuration removes grass. The side plate 45 is rotated by manually operating a side plate handle 45a provided outside the guide 16b. The handle 45a is attached to a rotating shaft 45b of one side plate 45, one end of a link member 45d is rotatably attached to an arm 45c integral with the rotating shaft 45b, and the other end of the link member 45d is already attached. One side plate 45 is pivotally attached to an arm 45c integrated with a pivot shaft 45b.

  Therefore, it is possible to open the pair of side plates 45, 45 by operating the handle 45a. When mowing the turf grass with the mower 6, the pair of side plates 45, 45 can be opened, and the turf grass deposited on the side plates 45, 45 can be easily removed manually by closing the side plates 45, 45.

  The configuration example shown in the overall perspective view of the mower deck of FIG. 5A, the partial perspective view of the mower deck of FIG. 5B viewed from the cylindrical portion side, and the plan view of the interior of the mower deck of FIG. The turf grass clogged on the wall surface on the cylindrical portion 16a side of the connection portion 16x between the guide guide 16b and the guide guide 16b is removed.

  A left and right turfgrass removal arm 46 is pivotally supported on upper portions of the left and right wall surfaces of the cylindrical portion 16a, and a rotation shaft 46a fixed to the left and right removal arm 46 is passed through the wall surface of the deck 16 and is armed outside the wall surface. The operation lever 46c is rotatably attached to the tip of the arm 46b. By sliding the operation lever 46c in the direction of arrow A from the outside of the moor deck 16, the left and right turfgrass removal arm 46 is rotated in the direction of arrow B to remove turfgrass deposited on the left and right wall surfaces of the cylindrical portion 16a. is there.

  The configuration example shown in the overall perspective view of the moor deck 16 in FIG. 6 is a configuration in which turf grass clogged on the inner wall side of the guide guide 16b of the connecting portion 16x between the cylindrical portion 16a and the guide guide 16b is removed. One end of the wire 47 on the outer wire 47a side is connected to a support portion 16c provided on the outer wall of the guide guide 16b. The inner wire 47b of the wire 47 is interlocked with a mower up-and-down moving link mechanism (not shown).

The tip of the inner wire 47b is rotatably connected to one end of an arm 49, and the other end of the arm 49 is fixed to a rotating shaft 48a that penetrates the wall surface of the guide guide 16b and reaches the inside of the guide. . The lower end portion of the turfgrass removing arm 48 is fixed to the rotating shaft 48a. Since the rotation shaft 48a is rotatably attached to the wall surface of the guide guide 16b, when the wire 47 is moved in the vertical direction (arrow A direction), the turfgrass removal arm 48 rotates in the arrow B direction. Therefore, when the mower 6 moves up and down, the inner wire 47b is operated together with a link mechanism (not shown) interlocked with the mower 6, and the turfgrass removing arm 48 is also rotated in the direction of the arrow B to accumulate on the inner surface of the wall surface of the guide guide 16b. Turfgrass can be removed.
In this configuration example, the turfgrass removal arm 48 is rotated in conjunction with the vertical movement of the mower 6, so that the turfgrass clogged in the inner wall portion of the guide guide 16 b can be removed even during the turfgrass cutting operation.

  Further, as shown in the exploded perspective view of FIG. 7, the transport shooter 14a constituting the intermediate portion of the shooter 14 disposed between the mower 6 and the collector 15 can be attached to the body of the lawn mower with one touch and can be removed. .

The transport shooter 14a is provided with a pair of handles 14d and 14d, and further provided at both ends of the transport shooter 14a are mating portions 14a1 and 14a2 having inner wall portions that respectively match the outer peripheral portions of the container side shooter 14b and the mower side shooter 14c. The plate springs 14b1 and 14c1 into which the mating portions 14a1 and 14a2 can be inserted are respectively disposed in the corresponding container side shooter 14b and mower side shooter 14c so that there is no gap in the joint portion. The leaf spring 14b1 of the container side shooter 14b is detachably disposed on the mounting portion 2a provided on the machine body.
With this configuration, it is possible to remove the clogged turf grass inside the shooters 14a, 14b, 14c by pulling out the transport shooter 14a while holding the handles 14d, 14d without removing the collector 15.

  Further, as shown in the perspective view of FIG. 8, the guide guide 16b is provided with a minimum passage space 16b1 through which the air / air blades 5B of the cutting blade 5 can pass, and the turfgrass packed in the connecting portion 16x between the cylindrical portion 16a and the guide guide 16b. The turf grass discharge performance from the guide guide 16b to the shooter 14 can be maintained. Further, by reducing the distance in which turfgrass can be accumulated, a large amount of turfgrass is blocked at the connecting portion 16x, so that continuous cutting work is possible even under heavy load conditions.

  Conventionally, in the operation under heavy load conditions, turfgrass accumulates and grows at the connection portion, so that the discharge port of the guide guide 16b is blocked and continuous lawn mowing work may not be possible. By doing so, clogging of turfgrass in the connection part 16x can be reduced, and the growth of the deposited turfgrass in the connection part 16x can be prevented.

  Further, as shown in the perspective view of FIG. 9, the lower end of the cylindrical portion side wall surface 16b2 of the guide guide 16b above the connecting portion is formed obliquely, and the size of the turfgrass passage space 16b1 is set to the air flow of the cutting blade 5. It is possible to reduce the turfgrass accumulation by making it as close as possible to the minimum size through which the wings 5B can pass, and to make the turfgrass to be deposited easily fall downward.

  The lawn mower of this embodiment includes a throttle lever 50 (FIG. 1) for controlling the engine speed and a PTO lever 51 (FIG. 1) for controlling the operation of a PTO for operating a PTO such as a mower. Regardless of the position of 50, the full throttle state is established when the PTO lever 51 is operated.

FIG. 10 shows a configuration for that purpose.
A throttle arm 53 that interlocks with the throttle of the engine is provided so as to be able to swing around its support shaft 53b, and is connected to the throttle lever 50 via a wire 54, a wire fastener 50c, a boss arm 50b, and a boss 50a. The throttle arm 53 can be swung by adjusting the throttle lever 50 to adjust the engine rotation.

  Further, an arm 53a for connecting the wire 54 composed of the throttle arm 53, the inner wire 54a, and the outer wire 54b is extended, and a wire 55 is interposed in the extended portion to interlock with the PTO lever 51. The PTO lever 51 operates the tension pulley 35 (see FIG. 1A) to enter the PTO state, but in conjunction with this operation, the wire 55 is pulled to swing the throttle arm 53 and the throttle opening degree. Is a big. Then, the swinging is stopped at a position where it comes into contact with the fully open stopper 57. At this time, as shown in FIG. 10B, the throttle lever 50 causes the inner wire 54a of the wire 54 to escape with the wire fastener 50c through the interchange hole 51c1 of the wire fastener 50c, and exerts an operating force on the lever 50. Absent.

Since it is configured as described above, when the PTO lever 51 is operated, the throttle arm 53 is pulled by the pulling action of the wire 55 and is operated to the fully open position where it contacts the stopper 57. Therefore, the full throttle state can always be maintained during the cutting operation.
In addition, when moving between fields without work, as a result of the PTO lever 51 being returned, the throttle arm 53 is pulled to the closed position.
In this state, the operation of the throttle is based on the operation of the throttle lever 50.

  Moreover, the top view which shows the input transmission structure of the cutting blade 5 of another Example is shown in FIG. That is, FIG. 11 shows a transmission configuration in which the PTO power is output to the front of the machine body as an engine crankshaft and can be extracted to a lower position by belt transmission or the like. FIG. 12 is a plan view showing two types of moor decks 16 having different sizes in FIG. 11 at the same time. As shown in the plan views of FIGS. 11 and 12, the drive is input through the drive universal joint 60, the first input shaft 61, the transmission pulleys 62 and 63, the drive belt 65, the second input shaft 66, the bevel transmission mechanism 67, and the like. It is a configuration.

In the mower 6 of this embodiment, the mower deck 16 can be shared in two sizes with a diameter of 48 inches and 54 inches. Therefore, the front-rear distance (L1) from the input shaft 61 to the bevel transmission mechanism 67 and the front-rear length (L2) of the second input shaft 66 are configured to be the same for the two types of mower decks 16.
Thus, the first input shaft 60, the second input shaft 66, and the belt portion cover 68 can be shared, leading to cost reduction.

  The side view of FIG. 13 shows a side view of a lawn mower according to another embodiment of the present invention. 14 shows a partially enlarged view of FIG. 13, and FIG. 15 shows a perspective view of FIG. The feature of this embodiment is that, at the base of the collector 15, the movable plate 71 pivotally attached to the base end of the lifting cylinder 70 of the collector 15 is rotated with respect to the fixed plate 72 for holding the cylinder (fixed to the collector support member 73). The movable plate 71 is provided so as to be adjustable, and the movable plate 71 is provided so as to be finely adjusted by the rotation of the eccentric plate 75, so that the position of the base of the cylinder 70 can be adjusted.

  The movable plate 71 has an arc-shaped long hole 71a, and the long hole 71a is slidably disposed by loosening a bolt 76 provided to protrude from the fixed plate 72. The movable plate 71 is fixed to an eccentric plate 75 to which the base end portion of the cylinder 70 is fixed. The eccentric plate 75 is rotatably fitted in a circular hole 72b hollowed in the fixed plate 72, and the rotation center 75b of the eccentric plate 75 coincides with the rotation center of the arc-shaped elongated hole 71a. ing.

  A cylinder fixing hole 75a is formed at a position deviated from the rotation center 75b of the eccentric plate 75, and the cylinder fixing pin 70a is inserted and fixed. Therefore, when the eccentric plate 75 is rotated around the rotation center 75b, the movable plate 71 moves in the direction of arrow A or arrow B in FIG. 14, and the cylinder fixing hole 75a moves in the direction of arrow C or D.

  Thus, the position of the fixing pin 70a of the cylinder 70 can be adjusted, and after the mounting position of the cylinder 70 is determined, the bolt 76 is tightened through the bolt hole 72a of the fixing plate 72 so that the position in the elongated hole 71a is not displaced. Thereby, the attachment position to the collector support member 73 is fixed.

  The conventional cylinder mounting position cannot be adjusted, and it is difficult to adjust the position of the collector 15 when the cylinder 70 is at the lowest position, and the collector 15 is tilted. The position can be easily adjusted, and the fixed position of the cylinder 70 can be adjusted quickly without applying force.

  According to the present invention, it is possible to efficiently perform a series of movements from cutting with a cutting blade of turfgrass to storage in a storage collector, so that industrial applicability is high.

It is the left view (FIG. 1 (a)) of the riding lawn mower of one Example of this invention, and its drive mechanism figure (FIG.1 (b)). It is a top view of the riding lawn mower of FIG. FIG. 2 is a plan layout view of a mower pulley, a belt, and a tension pulley of the riding lawn mower of FIG. 1. It is a perspective view of the mower deck of the riding lawn mower of FIG. 1 is a general perspective view of the mower deck of the riding lawn mower of FIG. 1 (FIG. 5A), a partial perspective view of the mower deck viewed from the cylindrical portion side (FIG. 5B), and a plan view of the interior of the mower deck (FIG. 5C). ). It is a perspective view of the mower deck of the riding lawn mower of FIG. It is a disassembled perspective view of the shooter arrange | positioned between the mower and collector of the riding lawn mower of FIG. It is a perspective view of the riding lawn mower of FIG. It is a perspective view of the mower deck of the riding lawn mower of FIG. FIG. 2 is an interlocking mechanism diagram for a configuration in which a full throttle state is obtained when a throttle lever and a PTO lever of the riding lawn mower of FIG. 1 are operated. It is a top view which shows the input transmission structure of the cutting blade of the other Example of the riding lawn mower of FIG. It is a top view which shows simultaneously two types of moor decks from which the size of FIG. 11 differs. It is a left view of the riding lawn mower of one Example of the present invention. It is the elements on larger scale of FIG. FIG. 14 is a partially exploded perspective view of FIG. 13.

Explanation of symbols

3 Front wheel 4 Rear wheel 5 Cutting blade 5A Blade edge 5B Winding blade 6 Moore 7 Floor 8 Steering column 10 Handle 11 Pilot seat 12 Transmission case 14 Shooter 14a Transport shooter 14a1, 14a2 Alignment portion 14b Container side shooter 14c Mower side shooter 14b1, 14c1 leaf spring 14d handle 15 collector 16 mower deck 16a cylindrical portion 16b guide guide 16b1 passage space 16b2 wall surface 16c on the cylindrical portion side support portion 16x connection portion 20 transmission shaft 21 transmission case 22 input shaft 24 first output shaft 25 second output shaft 26 27 27 Vertical axis 24a, 25a, 26a, 27a Pulley 29 Transmission belt 30 HST cooling fan 31 Transmission case 32a Pulley 34 Transmission belt 35 Tension pulley 37 Vertical axis 37a, 38a Gear 37b Pulley 38 First cut Blade shaft 40 Second cutting blade shaft 40a Pulley 41 Belt 42 Tension pulley 43, 44 Tension arm 45 Side plate 45a Side plate handle 45b Rotating shaft 45c Arm 45d Link member 46 Turf grass removal arm 46a Rotating shaft 46b Arm 46c Operation lever 47 Wire 47a Outer wire 47b Inner wire 48 Turf grass removal arm 48a Rotating shaft 49 Arm 50 Throttle lever 50a Boss 50b Boss arm 50c Wire clamp 50c1 Fitting hole 51 PTO lever 53 Throttle arm 53a Connecting arm 53b Support shaft 54 Throttle wire 54a Inner wire 54b Outer wire 55 PTO operation Wire 57 Fully open stopper 60 Drive universal joint 61 First input shafts 62, 63 Transmission pulley 65 Drive belt 66 Second input shaft 6 Bevel transmission mechanism 68 a belt cover 70 collector lifting cylinders 70a cylinder fixing pin 71 movable plate 71a long hole 72 fixing plate 72a bolt hole 72b circular hole 73 collector support member 75 eccentric plate 75a cylinder fixing holes 75b rotational center 76 volts

Claims (3)

A mower (6) having a mower deck (16) having a pair of cutting blades (5, 5) for cutting turf grass and a shooter (14) for conveying turf grass cut by the mower (6) In the lawn mower
The mower deck (16) includes left and right cylindrical portions (16a, 16a) in a plan view and a guide guide (16b) which is a straight discharge portion at the center rear end portion, and a cutting blade is provided in the cylindrical portions (16a, 16a). (5, 5) are arranged in parallel, and the cutting blades (5, 5) are rotated inwardly around the vertical axis to be guided to the guide guide (16b), and the guide guide (16b) is moved to the shooter (14 Turf grass removing means (45, 46, 48) for removing turf grass clogged in the connecting part (16x, 16x) between the cylindrical part (16a, 16a) and the guide guide (16b). A lawn mower characterized in that the connecting part (16x, 16x) is provided.   2. A lawn mower according to claim 1, further comprising an elevating means for elevating and lowering the mower (6), wherein the elevating means includes an interlocking mechanism (47 or the like) interlocking with the turfgrass removing means (48).   The lawn mower according to claim 1, further comprising an attachment / detachment mechanism (14a1, 14a2, 14b1, 14c1) capable of attaching and detaching an intermediate portion of the shooter (14) from the lawn mower body with one touch.

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