JP2006304723A - Apparatus for lifting and lowering collector for riding type lawn mower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a bad condition that an operator forgets return of a collector from a dump state to a storage state, operates a lifting and lowering actuator and breaks the collector since a lifting and lowering actuator for lifting and lowering the collector and a dump actuator for dumping the collector are independently and freely operated. <P>SOLUTION: In the apparatus for lifting and lowering a collector for a riding type lawn mower, with which the collector 24 for storing lawn grass is arranged at the rear part of a traveling vehicle body 2, the collector 24 is attached to lifting and lowering link mechanisms 22 and 22 and lifted and lowered freely by the lifting and lowering actuator 26 and the collector 24 is changed from a storage state to a dump state by an actuator 27 for dump, a dump operation lever 72 for operating the actuator 27 for dump is constantly urged to a non-dump side by a spring 74. Consequently, when an operator releases hands from the dump operation lever 72, the dump operation lever 72 is moved to a non-dump position by the spring 74, the collector 24 is returned to a non-dump state and a collector opening and closing part 24b is closed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a collector lifting device for a riding lawn mower.

In a riding lawn mower, a collector for storing turfgrass is provided at the rear of the traveling vehicle body, and this collector is attached to a link mechanism so that it can be moved up and down by a lifting actuator, and the collector is changed from a stored state to a dumped state by a dumping actuator. A structure that can be changed and that operates the lifting and dumping actuators independently is known (Patent Document 1).
JP-A-5-76231

  In conventional lawn mowers, the lifting actuator that raises and lowers the collector and the dumping actuator that dumps the collector can be operated independently, so you forget to return the collector from the dumped state to the stowed state. As a result, the lifting actuator was activated and the collector was damaged.

  The collector is constructed by pivotally supporting a collector opening / closing part with respect to the collector main part, and when discharging the turf grass from the collector, the collector is raised by a link mechanism, and the collector is dumped to discharge the turf grass. The collector opening / closing part opens in relation to the dump, and the collector opening / closing part is closed and rotated by its own weight in connection with the return of the collector to the non-dumping state. Therefore, when the riding lawn mower runs on the uneven surface, there is a problem that the acting force in the closing direction of the collector opening / closing portion is insufficient and rattles.

  Therefore, the present invention is intended to solve such a problem.

In order to solve the above problems, the present invention has taken the following technical means.
According to the first aspect of the present invention, a collector 24 for storing turfgrass is provided at the rear portion of the traveling vehicle body 2, and the collector 24 is attached to the lift link mechanisms 22, 22 so as to be lifted and lowered by the lift actuator 26. In a riding lawn mower configured such that the collector 24 can be changed from the housed state to the dumped state by the dumping actuator 27, the collector 24 is configured to be freely opened and closed by a collector main body 24a and a collector opening / closing part 24b, and the collector main body 24a And a collector opening / closing part 24b in a closed state are provided, and the locking member 51 is switched between a locked state and an unlocked state in association with the lifting and lowering of the lifting link mechanisms 22, 22. A lawn mower collector lifting device.

  According to the above configuration, when the collector 24 in the storage state is in the lowered position, the collector 24 is in a closed state in which the collector main body 24a and the collector 24b are locked by the lock member 51, and the turf grass cut by the mower is the collector. 24.

  When the collector 24 is lifted by the lift link mechanisms 22, 22 by the lift actuator 26, the lock member 51 is switched from the closed state to the unlocked state, and when the collector 24 is dumped by the dump actuator 27, the collector opening / closing portion 24b opens and the turf grass stored is dropped and discharged.

  Further, when the collector 24 returns from the dumped state to the closed state and the collector 24 is lowered by the elevating link mechanisms 22 and 22, the lock member 51 is switched from the unlocked state to the locked state, and the collector main body portion 24a and the collector opening / closing portion 24b. And locked in the closed state.

  According to the second aspect of the present invention, a collector 24 for storing turfgrass is provided at the rear part of the traveling vehicle body 2, and the collector 24 is attached to the lift link mechanisms 22, 22 and is configured to be movable up and down by a lift actuator 26. In the riding lawn mower configured so that the collector 24 can be changed from the closed state to the dumped state by the dumping actuator 27, the dumping operation lever 72 for operating the dumping actuator 27 is always biased to the non-dumping operation position side by the spring 74. It is set as the collector raising / lowering apparatus of the riding lawn mower characterized by the above-mentioned.

  According to the above configuration, when the collector 24 in the closed state is in the lowered posture, the turf grass cut by the mower is stored in the collector 24. Further, when the collector 24 is lifted by the elevating link mechanisms 22 and 22 and the dump operation lever 72 is operated to the dump operation position side, the dump actuator is actuated to dump the collector 24, and the collector opening / closing part 24b is opened to open the turf grass. Is dropped and discharged. When the operator releases the dump operation lever 72, the dump operation lever 72 is moved to the non-dump operation position side by the spring 74, the collector 24 is returned to the non-dump state by the dump actuator 27, and the collector opening / closing portion 24b. Will be closed.

  According to the third aspect of the present invention, a collector 24 for storing turfgrass is provided at the rear part of the traveling vehicle body 2, the collector 24 is attached to the lift link mechanisms 22, 22 and is configured to be movable up and down by a lift actuator 26. In the riding lawn mower configured so that the collector 24 can be changed from the closed state to the dumped state by the dumping actuator 27, the dumping actuator 27 is constituted by the hydraulic dump cylinder 27, and the non-dumping operation side of the hydraulic dump cylinder 27 is provided. It is set as the collector raising / lowering apparatus of the riding lawn mower characterized by supplying pressure oil to a constant.

  According to the above configuration, when the collector 24 in the closed state is in the lowered posture, the turf grass cut by the mower is stored in the collector 24. Further, when the collector 24 is raised by the elevating link mechanisms 22 and 22 and the dump operation lever 72 is operated to the dump side, the hydraulic pressure is supplied to the dump operation side of the hydraulic cylinder 27 which is the dump actuator 27 and the collector 24 is dumped. The collector opening / closing part 24b is opened, and the turf grass is dropped and discharged. When the dump operation lever 72 is returned to the neutral position, pressure oil is supplied and flows into the non-dump operation side of the hydraulic dump cylinder 27, the hydraulic dump cylinder 27 is operated to the non-dump side, and the collector 24 is Return from the dump state to the non-dump state.

  In the first aspect of the present invention, when the collector 24 is lowered by the elevating link mechanisms 22 and 22, the collector main body portion 24a and the collector opening / closing portion 24b are locked by the lock member 51, so that the collector 24 opens. In addition, rattling of the collector opening / closing portion 24b can be prevented even when traveling on uneven surfaces.

According to the second aspect of the present invention, the collector opening / closing portion 24b of the collector 24 can be prevented from descending in the open state, and damage to the collector 24 and parts near the lowered position of the collector 24 can be prevented.
According to the third aspect of the present invention, the dump actuator 27 is constituted by the hydraulic dump cylinder 27, and pressure oil is always sent to the non-dump operation side of the hydraulic dump cylinder 27. Therefore, the collector opening / closing portion 24b of the collector 24 is provided. Always operates to the closed side, prevents the collector 24 from being lowered in the open state, and can prevent damage to the collector 24 and parts near the lowered position of the collector 24.

Hereinafter, an embodiment of a lifting apparatus for a riding lawn mower according to the present invention will be described.
First, the overall configuration of the riding lawn mower will be described based on the overall side view of FIG.
Reference numeral 1 denotes a riding lawn mower, which includes left and right front wheels 3 and 3 and left and right rear wheels 4 and 4 at the front and rear of a traveling vehicle body 2, an engine 6 mounted on the rear of the traveling vehicle body 2 and covered with an engine cover 7. is doing. A handle post 16 is provided at the front end portion of the traveling vehicle body 2, a steering handle 17 is provided at the handle post 16, and a seat 18 is provided at the front side portion of the traveling vehicle body 2 so as to be positioned behind the steering handle 17. .

  An HST (hydrostatic continuously variable transmission) 8 and a transmission case 9 are provided at the front of the engine 6 at the rear of the traveling vehicle body 2, and power is transmitted from the output shaft of the engine 6 to the HST 8. The reversely switched and shifted power is shifted by the transmission in the transmission case 9 and transmitted to the left and right front wheels 3 and 3 via the left and right front wheel transmission cases 11 and 11. Further, a mower 12 is provided at the front lower portion of the traveling vehicle body 2 so as to be movable up and down, and power is transmitted to the mower 12 via a PTO shaft 13 extending forward from the mission case 9.

  A gate-shaped frame 21 is erected at the rear of the traveling vehicle body 2 in a front view, and the base ends of the upper and lower elevating links 22 and 22 are pivotally supported on the left and right upper portions of the frame 21 so as to be rotatable up and down. Mounting frame bodies 23 and 23 are attached to the front end portions of 22 and 22, the frame portion of the collector 24 is pivotally supported on the mounting frame bodies 23 and 23, and the lifting links 22 and 22 can be lifted and lowered by the lifting cylinders 26 and 26. It is composed. Reference numeral 27 denotes a dump cylinder that interlocks opening and closing of the collector opening / closing part 24b. The turf grass cut by the mower 12 is stored in the lowered collector 24 via the shooter 28 below the left and right intermediate portions of the traveling vehicle body 2.

Next, the hydraulic circuit configuration for raising and lowering the collector 24 and dumping will be described with reference to FIG.
When the hydraulic pump 31 is driven by the engine 6, the hydraulic pressure from the hydraulic pump 31 is sent to the mower elevating control valve 33 via the high-pressure circuit and the diversion valve 32, and the mower cylinder is operated by switching the mower elevating control valve 33. 34 is expanded and contracted, and the mower 12 is moved up and down. Also, the hydraulic pressure is sent to the lift control valve 36, and the lift cylinder 26 is expanded and contracted by the switching operation of the lift control valve 36 to lift and lower the lift links 22, 22 and the collector 24. Further, the hydraulic pressure is sent to the dump control valve 38, and by switching the dump control valve 38, the dump cylinder 27 is expanded and contracted to return the collector 24 to the dump state or return to the non-dump state.

  The pump port of the dump control valve 38 and the shortening side 27a of the dump cylinder 27 are connected by the shortening side circuit 41, and the tank port of the dump control valve 38 and the extension side 27b of the dump cylinder 27 are connected by the extension side circuit 42. Yes. Then, the middle part of the reflux circuit 43 that communicates the hydraulic pump 31 and the tank 39 is connected to the shortening side circuit 41 and the extension side oil passage 37, and the connection part of the reflux circuit 43 to the shortening side circuit 41 is high pressure. A low-pressure orifice 46 is arranged at a connection portion between the orifice 44 and the expansion side circuit 42 of the reflux circuit 43.

  Thus, when the neutral state of the dump control valve 38 is not operated, the collector 24 is automatically brought into the non-dump state by constantly applying a constant pressure to the shortening side 27a of the dump cylinder 27 so as to shorten the extension side 27b. It is constituted to return to.

  Therefore, the collector 24 always returns to the non-dump state, and the collector opening / closing part 24b is actuated to the closed side, so that the collector 24 can be prevented from being damaged while improving the operability for the operator.

Next, the locking device for the collector opening / closing part 24b of the collector 24 will be described with reference to FIGS.
The collector 24 is configured in a box shape by front and rear side plates, left and right side plates, a bottom plate, and an upper plate. The collector main body 24a is composed of a front side plate, left and right side plates and a bottom plate, and a collector opening / closing portion 24b is formed of an upper side plate and a rear side plate. The front side of the upper plate is pivotally supported so as to be openable and closable, and the collector 24 can be dumped or non-dumped by the expansion and contraction of the dump cylinder 27 so that the collector opening and closing part 24b can be opened and closed.

  Then, left and right dump restricting hooks 51, 51 are pivotally supported at the rear lower ends of the left and right side plates of the collector main body 24a, and the dump restricting hooks 51, 51 are rearwardly supported by springs 53, 53. It tends to rotate to the lock position on the side. Then, lock pins 52, 52 are provided on the left and right sides of the lower part of the rear side plate in the collector opening / closing part 24b. When the collector opening / closing part 24b is closed, the dump regulating hooks 51, 51 are rotated rearward by the springs 53, 53. The collector is engaged with the lock pins 52 and 52 and the collector 24 is locked in the closed state. Further, attachment bodies 54, 54 are attached to rear end portions of the lower elevating links 22, 22, and between the attachment bodies 54, 54 and the dump restricting hooks 51, 51 by interlocking wires 56, 56 having a predetermined length. It is connected.

  Thus, in the state in which the elevating links 22 and 22 are pivoted downward, the attachment bodies 54 and 54 move rearward as shown by dotted lines in FIG. 5 and the interlocking wires 56 and 56 are loosened, and the dump restricting hooks 51 and 51 are moved. Is rotated to the rear side by the springs 53 and 53 and is brought into a locked state engaged with the lock pins 52 and 52.

  Further, when the elevating links 22 and 22 are turned upward, the attachment bodies 54 and 54 are rotated to the front side as indicated by phantom lines in FIG. 5, and the interlocking wires 56 and 56 are pulled to the front side. 51 turns to the front side against the springs 53, 53, and is in an openable state detached from the lock pins 52, 52.

  Therefore, when the collector 24 is in the non-dump state, the dump regulating hooks 51, 51 and the lock pins 52, 52 are not engaged and the collector 24 is not released, and the flapping of the collector 24 is prevented while preventing the collector 24 from flapping. The storing operation can be performed smoothly.

  Next, a locking device of the collector 24 may be configured as shown in FIG. That is, the left and right dump restricting hooks 51, 51 are pivotally supported on the frame portion 24c of the collector main body 24a so as to be pivotable up and down, and the dump restricting hooks 51, 51 are urged toward the lock side by the springs 53, 53. Lock pins 52, 52 are provided on the left and right sides of the lower part of the rear plate in the opening / closing part 24b. The rear end portion of the lower lift link 22 and the elongated holes 51a, 51a of the dump restricting hooks 51, 51 are interlocked and connected by connecting rods 68, 68 that can be expanded and contracted.

  Thus, when the elevating links 22 and 22 are raised to a predetermined height (for example, a height that does not interfere with the frame portion of the collector main body 24a even if the collector opening / closing portion 24a is opened), the elevating links 22 and 22 are moved upward. The connecting rod 68 moves to the front side, the dump restricting hooks 51 and 51 turn to the front side to unlock, and the collector opening / closing part 24b can be opened.

Therefore, it is possible to prevent the collector 24 from being damaged while preventing the collector opening / closing portion 24b from flapping when the riding lawn mower 1 travels on uneven surfaces.
Next, the lock structure of the elevating links 22 and 22 when the collector 24 is raised will be described with reference to FIGS.

  The left and right mounting plates 57, 57 provided at the upper end of the frame 21 are pivotally supported by the front end portions of the elevating links 22, 22 in a vertically rotatable manner, and a first lock hole 58 is provided at the intermediate portion of the mounting plate 57. A lock plate 59 with a second lock hole 59a is attached to the base of the lower elevating link 22, and when the lower elevating link 22 is raised to the dumping position, which is the highest position, the first lock hole 58 on the frame 21 side. And the second lock hole 59a on the lifting link 22 side are configured to coincide with each other.

  Further, the first lock hole 58 of the mounting plate 57 is provided with a lock pin 61 so that it can be inserted and removed, and one end of the push / pull means 62 is connected to the rear side portion of the bottom plate of the collector opening / closing part 24b. Is connected to the lock pin 61. In this embodiment, the push / pull means 62 includes a push / pull wire 62a connected between the bottom plate of the collector opening / closing portion 24b and the lock pin 61 with a predetermined clearance, and a push spring 62b. .

  Thus, when the elevating links 22 and 22 are pivoted downward and the collector opening / closing portion 24b is closed with the dump cylinder 27 shortened in the non-dumping state, the push / pull means 62 is pulled and locked by the bottom plate of the collector opening / closing portion 24b. The pin 61 is detached from the first lock hole 58. Next, when the elevating links 22 and 22 are raised to the highest position, the first lock hole 58 and the second lock hole 59a are matched.

  Next, when the dump cylinder 27 is extended and the collector 24 is dumped, the collector opening / closing part 24b is opened and the turf grass in the collector 24 is discharged. When the push-pull wire 62a is loosened in connection with the dumping rotation of the collector 24, the push-pull wire 62a is pushed by the spring 62b, and the lock pin 61 is pushed into the first lock hole 58 and the second lock hole 59a, and is moved up and down. The links 22, 22 are locked in the raised position.

  Next, when the dump cylinder 27 is shortened and the collector 24 is rotated back to the non-dump state, the lock push / pull means 62 pulls the lock pin 61 from the first lock hole 58 and the second lock hole 59a, The elevating links 22 and 22 are ready to descend.

  Therefore, the collector 24 is not lowered while the collector 24 is in the dumping state and the collector opening / closing portion 24b is in the open state, and the collector opening / closing portion 24b can be prevented from being damaged.

  Further, the connection configuration of the lock pin 61 and the push-pull means 62 may be configured as shown in FIG. That is, an arm 63 refracted in a V-shape is pivotally supported on the mounting plate 57, a pin provided at one end of the arm 63 is linked to a long hole 62c at the end of the push-pull wire 62a, and the other end of the arm 63 is connected. And the lock pin 61 are pin-connected.

  As in the above embodiment, the lock pin 63 can be inserted and removed by the push / pull means 62, and the lock pin 61 can be operated regardless of the movement of the push / pull means 62 by rotating the arm 63. The lifting links 22 and 22 can be lifted and lowered freely during inspection work, and maintenance work is facilitated.

  Moreover, you may comprise the related structure of the lock pin 61, the pushing / pulling means 62, and the dump control hook 51 as shown in FIG. That is, the push-pull means 62 is constituted by the push-pull wire 62a, the spring 62c, and the dump restricting wire 62d branched from the end of the push-pull wire 62a, and one end of the push-pull wire 62a is connected to the lock pin 61. The other end of 62a is connected to the bottom plate of the collector 24 via a spring 62c, and the dump restricting wire 62d is connected to the dump restricting hook 51.

Thus, both the lock pin 61 and the dump restricting hook 51 can be operated by the push-pull means 62, and the configuration can be simplified.
Next, the operation device of the dump cylinder 27 will be described with reference to FIG.

  The dump operation lever 72 for operating the dump control valve 38 is configured to be movable along the neutral position (N), the raising position (U), and the lowering position (D) of the operation groove 73, and the operation lever 72 has a spring 74. Is always pressed and biased toward the lowered position (D). Further, the frame portion 24c of the collector main body portion 24c is pivotally connected to the mounting frame body 23 attached to the rear end portions of the elevating links 22 and 22, and the tip end portion of the mounting frame body 23 and the frame portion 24c of the collector 24 are connected to each other. A dump cylinder 27 is connected between the collector 24 and the collector 24 so that dumping is possible. A long hole 76a is provided at one end of the connecting wire 76, the long hole 76a is linked to the dump operation lever 72, and the other end of the connecting wire 76 is linked to the frame 24c of the collector main body 24a.

  When the dump operation lever 72 is operated to the raised position (U), the dump cylinder 27 extends to dump the collector 24 and discharge the turfgrass. Further, when the hand is released from the dump operation lever 72, it is moved to the lowered position (D) by the spring 74, and the dump cylinder 27 is shortened and returned to the non-dump state. Then, in connection with the return of the collector 24 to the non-dump state, the connecting wire 76 is pulled to the rear side, and the dump operation lever 72 is returned from the lowered position (D) to the neutral position (N). The oil pressure can be prevented from blowing out and the oil can be prevented from deteriorating.

  Since it comprised as mentioned above, the collector 24 can be prevented from descending in a state where the collector 24 is dumped and the collector opening / closing part 24b is opened, and damage to the collector 24 can be prevented.

  Moreover, you may comprise as shown in FIG. 12 and FIG. In other words, the frames 21 and 21 do not contact when the collector 24 descends in the non-dump state, but are provided with an operating piece of the sensor switch 77 at a portion where a part of the collector 24 abuts when the collector 24 descends in the dump state. When 77 is turned on, for example, the buzzer 81 sounds and an alarm is issued. Thus, the lowering of the collector 24 in the dumping state can be detected by an alarm, and the dumping lever 72 is operated to the lowered position to return the collector 24 to the non-dumping state, thereby preventing the collector 24 from being damaged. Can do.

The whole side view of a riding lawn mower. Hydraulic circuit diagram. The side view of the collector of a descent | fall state. The side view of the collector of a raise state. Side view of the collector. The principal part enlarged side view of a collector. Side view of the frame and collector. The front view of a flame | frame and a collector. Side view of the collector. The front view of a collector. Side view of the collector. The side view which shows the relationship between a collector and a sensor switch. The perspective view which shows the relationship between a collector and a sensor switch.

Explanation of symbols

2 Traveling body 22 Lifting link mechanism 24 Collector 24a Collector main body 24b Collector opening / closing part 26 Lifting actuator 27 Dump actuator (dump cylinder)
41 Short circuit 42 Extension side circuit 43 Recirculation circuit 44 High pressure orifice 46 Low pressure orifice 51 Lock member (dump restriction hook)
52 Lock pin 72 Dump operation lever 74 Spring

Claims (3)

  A collector (24) for storing turfgrass is provided at the rear part of the traveling vehicle body (2), and the collector (24) is attached to the lift link mechanism (22, 22) and is configured to be movable up and down by the lift actuator (26). In the riding lawn mower configured so that the collector (24) can be changed from the housed state to the dumped state by the dumping actuator (27), the collector (24) is composed of a collector main part (24a) and a collector opening / closing part (24b). A lock member (51) that is configured to be openable and closable and locks the collector main part (24a) and the collector open / close part (24b) in a closed state is provided to relate to the raising and lowering of the elevating link mechanism (22, 22). A collector elevating device for a riding lawn mower, wherein the lock member (51) is switched between a locked state and an unlocked state.   A collector (24) for storing turfgrass is provided at the rear part of the traveling vehicle body (2), and the collector (24) is attached to the lift link mechanism (22, 22) and is configured to be movable up and down by the lift actuator (26). In the riding lawn mower configured so that the collector (24) can be changed from the closed state to the dumped state by the dumping actuator (27), the dumping operation lever (72) for operating the dumping actuator (27) is spring (74) The raising / lowering device for a collector of a lawn mower for riding is characterized in that it is always urged to the non-dumping operation position side. A collector (24) for storing turfgrass is provided at the rear part of the traveling vehicle body (2), and the collector (24) is attached to the lift link mechanism (22, 22) and is configured to be movable up and down by the lift actuator (26). In the riding lawn mower configured so that the collector (24) can be changed from the closed state to the dumped state by the dumping actuator (27), the dumping actuator (27) is constituted by a hydraulic dump cylinder (27), and the hydraulic pressure A collector raising / lowering device for a riding lawn mower characterized in that pressure oil is always supplied to the non-dump operation side of the dump cylinder (27).

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