JP7023215B2 - Mower - Google Patents

Description

The present invention relates to a mower in which a mower is suspended and supported so as to be able to move up and down via a link mechanism to a traveling machine.

In the above-mentioned mower, conventionally, the link mechanism for supporting the mower has been configured as follows. That is, swing links are provided on both front and rear sides, one end of each swing link is swingably connected to the frame of the traveling machine body, and the other end of each swing link is swingably connected to the auxiliary link. Each auxiliary link is swingably connected to the cutting blade housing in the mower (see, for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 2003-274730

In the above-mentioned conventional configuration, even when the mower rises to the maximum ascending position with respect to the traveling machine, each swinging link suspends and supports the cutting blade housing via the auxiliary link, so that it is on the upper side of the cutting blade housing. Space is formed. As a result, there is an advantage that it is easy to secure a space for installing a transmission mechanism for transmitting power to the cutting blade on the upper side of the cutting blade housing.

However, in the above-mentioned conventional configuration, an auxiliary link having a configuration in which both end portions are pivotally connected so as to be swingable is interposed between the swinging link and the cutting blade housing. There is a risk that the amount of rattling will increase and the rattling in the left-right direction will increase. As a result, the position of the mower in the left-right direction with respect to the traveling machine is not stable, and there is a disadvantage that the member on the traveling machine side and the member on the moor side come into contact with each other and the member is damaged with long-term use. ..

Therefore, it is hoped that the installation space for the transmission mechanism can be secured regardless of the raising and lowering operation of the mower, while the position of the mower in the left-right direction is stabilized and the risk of damage to the members is reduced. It was rare.

The characteristic configuration of the mower according to the present invention is that the mower is suspended and supported by the traveling machine body so as to be able to move up and down via a link mechanism, and the mower is rotationally driven to mow and the mowing that covers the upper side of the mowing blade. A blade housing and a transmission mechanism located above the cutting blade housing to transmit power to the cutting blade are provided, and the link mechanism has a front swing link located on the front side of the machine and a swing link on the rear side of the machine. A rear swing link is provided, and a vertically extending portion extending upward from the upper surface of the cutting blade housing is erected at each of the front side portion and the rear side portion in the upper part of the cutting blade housing. One end of the swing link on the front side is swingably connected to the traveling machine body, and the other end is swingably connected to the upper part of the vertically extending portion on the front side. One end of the swing link on the side is swingably connected to the traveling machine body, and the other end is swingably connected to the upper part of the vertically extending portion on the rear side, so that the cutting blade housing is discharged. A grass collecting duct that guides the grass discharged from the portion to the rear of the vehicle body and a grass collecting container that stores the grass guided by the grass collecting duct are provided, and the bottom plate of the discharging portion is operated by the operation tool on the mower side. The bottom plate of the grass collecting duct, which is supported so as to be swingable up and down around the first horizontal axis core and is connected to the bottom plate of the discharge portion to form a grass cutting guide surface, is around the second horizontal axis core by operating the duct side operating tool. The bottom plate of the grass collecting duct is supported so as to be swingable up and down, and the front end is in a mowing guide state in which the front end is connected to the bottom plate of the discharge portion, and the front end is rotated upward to position the center of gravity of the second horizontal axis. A gap that is provided so as to be swingable over the retracted state located on the rear side of the position of the above, and pushes the side plate of the grass collecting duct from the lateral outer side to the lateral inward side by urging force. The point is that a restraining member is provided .

According to the present invention, the link mechanism that supports the mower is composed of an oscillating link on the front side and an oscillating link on the rear side, and the pivot connection point is only the end of each oscillating link. Even if it is used for a long time, there is little possibility that the rattling in the left-right direction will increase. As a result, the position of the mower in the left-right direction with respect to the traveling machine is stable, and the possibility that the member on the traveling machine side and the member on the mower side come into contact with each other is reduced.

Since each swing link is swingably connected to a vertically extending portion extending upward from the upper surface of the cutting blade housing, the swing link is vertically extended even if the mower is raised to the maximum rising position. Since the cutting blade housing is suspended and supported via the portion, it is possible to prevent the transmission mechanism located on the upper side of the cutting blade housing from interfering with the member on the machine body side.

Therefore, it is possible to secure the installation space for the transmission mechanism regardless of the raising and lowering operation of the mower, while stabilizing the position of the mower in the left-right direction and reducing the risk of damage to the members. It became.

Further , according to this configuration, when the mowed grass is clogged, the clogged grass can be cleared and the smooth discharge operation can be performed by shaking the bottom plate of the discharge portion and the bottom plate of the grass collecting duct. Then, when the bottom plate of the discharge section is swung in order to discharge the grass remaining in the discharge section at the end of the work or when collecting the grass in the grass collection container, the grass collection duct is used. When the bottom plate is switched to the retracted state, the bottom plate of the grass collecting duct can maintain the retracted state by its own weight even if the hand is released from the operation tool on the mower side. As a result, the bottom of the grass collecting duct is opened, and the grass cut in the discharging portion can be easily discharged.

Since the bottom plate of the grass collecting duct is configured to be swingable, the bottom plate and the side plates located on both sides in the lateral direction thereof are separated from each other. Then, the pressing force due to the discharged grass may act, or the grass collecting container may come into contact with external objects such as convex parts of the ground or trees due to the grass cutting work, and an unreasonable force may be applied in the lateral direction. As a result, the side plate may be displaced laterally outward, widening the gap between the side plate and the bottom plate. If the gap is widened, there is a disadvantage that the cut grass stays and accumulates in a lump.

Therefore, according to this configuration, by providing the gap suppressing member, even if the above-mentioned force acts on the side plate, the gap suppressing member pushes the side plate inward in the lateral direction. By preventing the gap between the side plate and the bottom plate from widening, it becomes easy to prevent the mowing from accumulating.

It is an overall side view of a mower. It is the whole plan view of the mower. It is a plan view of Moor. It is a side view of the moor arrangement part in the grounded state. It is a vertical sectional side view which shows the discharge part and the duct in the grounded state. It is a side view of the moor arrangement part in the raised state. It is a vertical sectional side view which shows the discharge part and the duct in the raised state. It is a cross-sectional plan view which shows a discharge part and a duct. It is a vertical sectional front view of a duct. It is a perspective view which shows the linkage structure for operation. It is a side view which shows the 2nd linkage mechanism when the bottom plate is in the retracted state.

Hereinafter, an example of a mode for carrying out the present invention will be described with reference to the drawings.
Unless otherwise specified, the front-back direction and the left-right direction in the description of the present embodiment are described as follows. That is, the traveling direction on the forward side (see arrow F in FIG. 1) is "forward" and the traveling direction on the backward side (see arrow B in FIG. 1) is "" when the passenger-type mower according to the present invention is running. "Rear", the direction corresponding to the right side (see arrow R in FIG. 2) with respect to the forward posture in the front-back direction is "right", and the direction corresponding to the left side (see arrow L in FIG. 2) is "left". ".

〔overall structure〕
As shown in FIGS. 1 and 2, the mower is self-propelled with a pair of left and right steerable front wheels 2 on the front side of the traveling machine 1 and a pair of left and right driveable rear wheels 3 on the rear side. It is configured as follows. Below the vehicle body, a rear discharge type mower 4 is suspended and supported between the front wheels 2 and the rear wheels 3 in the front-rear direction so as to be able to move up and down. A grass collecting container 5 as a grass collecting section for accommodating the grass cut by the mower 4 is provided on the rear side of the traveling machine 1.

A driving unit 6 is provided on the front portion of the traveling machine body 1, and a boarding operation unit 7 is provided on the rear side of the driving unit 6. In the driving unit 6, the engine 8 is mounted and supported on the machine frame 10 in a state of being built in the engine bonnet 9. The power taken out from the rear side of the engine 8 is input to the hydrostatic continuously variable transmission (HST) 12 located rearward via the transmission shaft 11 extending rearward. The output from the hydrostatic continuously variable transmission 12 is transmitted to the left and right rear axles 3a via the chain type transmission mechanism (not shown) built in the transmission case 13 provided at the rear and the transmission cases 14 on both the left and right sides. The rear wheel 3 is driven. The transmission case 14 extends diagonally downward from the lateral side of the mission case 13.

A power take-out mechanism 15 configured by a belt transmission mechanism is provided on the front side of the engine 8, and the engine 8 is provided via a PTO shaft 16 provided in the power take-off mechanism 15 and a transmission mechanism 33 provided in the upper part of the mower 4. Power is transmitted to Moor 4.

The boarding operation unit 7 is provided with a control panel 17 connected to the rear side of the engine bonnet 9, and a control unit 19 provided with a steering wheel 18 and the like capable of steering the front wheels 2. A driver's seat 20 is installed on the rear side of the control unit 19, and a rops 21 is provided at the rear portion of the driver's seat 20.

[Composition of Moor]
As shown in FIG. 3, the mower 4 has a structure in which two blades 32 as cutting blades are arranged side by side in the cutting blade housing 31, and the blade 32 on the left side is driven clockwise. The blade 32 on the right side is driven counterclockwise. In this way, the blade 32 on the left side is driven clockwise, and the blade 32 on the right side is driven counterclockwise, so that the grass is driven by the transport wind generated by the rotation of both blades 32, and the cutting blade housing 31 It is configured to be discharged rearward from the discharge portion 34 formed near the center of the rear portion. The grass discharged from the discharge unit 34 is guided by the grass collection duct 35 connected to the discharge unit 34, and is sent to the grass collection container 5 and stored.

As shown in FIG. 4, the mower 4 is supported by the airframe frame 10 so as to be able to move up and down via the lift link mechanism 36. The elevating link mechanism 36 includes a pair of front and rear swing links 37A and 37B whose upper end side is pivotally connected to the machine frame 10 and whose lower end side is pivotally connected to the cutting blade housing 31 on each of the left and right sides. ..

A pair of left and right vertically extending portions 31A and 31B extending upward from the upper surface of the cutting blade housing 31 are erected at each of the front side portion and the rear side portion in the upper portion of the cutting blade housing 31. As shown in FIG. 3, the vertical extension portion 31A on the front side and the vertical extension portion 31B on the rear side each have a shape in which the plate body is bent into a substantially L shape in a plan view, and the cutting is performed. It is integrally connected to the upper surface of the blade housing 31 by welding.

One end of the swing link 37A on the front side is swingably connected to the machine frame 10 of the traveling machine body 1 around the horizontal axis, and the other end is a horizontal shaft on the upper part of the vertically extending portion 31A on the front side. It is connected so that it can swing around the core. On the other hand, one end of the rear swing link 37B is swingably connected to the machine frame 10 of the traveling machine 1 around the lateral axis, and the other end is connected to the upper part of the vertically extending portion 31B on the rear side. It is swingably connected around the horizontal axis.

As shown in FIG. 3, the vertical extension portion 31A on the front side and the vertical extension portion 31B on the rear side each have a shape in which the plate body is bent into a substantially L shape in a plan view, and the cutting is performed. It is integrally connected to the upper surface of the blade housing 31 by welding. The vertical extension portion 31A on the front side and the vertical extension portion 31B on the rear side extend upward from the upper surface of the cutting blade housing 31 to a height substantially equal to the height of the transmission mechanism 33 for the cutting blade. With this configuration, as shown in FIG. 6, even if the mower 4 is raised to the maximum rising position, the upper end portion of the transmission mechanism 33 corresponding to the machine frame 10 interferes with the machine frame 10. It is possible to secure a space for installing the transmission mechanism 33 on the upper side of the cutting blade housing 31.

The front and rear swing links 37A and 37B are interlocked with each other on the upper end side by a connecting rod 38, and one end of the hydraulic cylinder 39 for raising and lowering is interlocked with the operation portion 37A1 formed on the front swing link 37A. Has been done. The other end of the hydraulic cylinder 39 is pivotally connected to the airframe frame 10. The mower 4 can be raised and lowered by expanding and contracting the hydraulic cylinder 39 to swing the swing links 37A and 37B. In the cutting work state, the mower 4 performs cutting traveling while following the ground contact with the gauge ring 40 provided at the lower end of the cutting blade housing 31 in contact with the ground.

As shown in FIGS. 3, 4, and 5, the discharge portion 34 is formed at the central rear portion in the left-right direction of the cutting blade housing 31 so as to extend diagonally upward and rearward. The discharge unit 34 includes a discharge unit main body 41 integrally connected to the cutting blade housing 31, and a guide member 42 forming the bottom of the discharge unit main body 41. The discharge unit main body 41 has a ceiling surface 41a and side surfaces 41b on both the left and right sides, and is formed in an inverted U shape when viewed in the front-rear direction. A plate-shaped guide member 42 is provided so as to cover the lower part of the internal space formed by the discharge portion main body 41. Therefore, the discharge unit main body 41 and the guide member 42 form a substantially rectangular tubular transport path extending diagonally upward and rearward. During the transportation of the guide member 42, an upward guide surface 43 for guiding the grass in the upward direction is formed.

As shown in FIGS. 8 and 10, the guide member 42 is provided around the first horizontal axis X1 with respect to the cutting blade housing 31 by the support shaft 44 erected over the left and right side surfaces 41b of the discharge unit main body 41. It is supported so that it can swing up and down. The guide member 42 is linked to the first operating lever 71 provided in the vicinity of the driver's seat 20 via the first linking mechanism 70, and the guide member 42 is shaken by manually operating the first operating lever 71. It is configured to be movable. When the mowing is clogged in the discharging unit 34 due to the mowing work, the clogged mowing can be cleared and conveyed by reciprocating and swinging the first operation lever 71.

As shown in FIGS. 3, 5 and 8, the first linking mechanism 70 has a support shaft portion 72 facing left and right and is supported by a rear portion on the right side of the cutting blade housing 31 so as to be vertically swingable. , The first arm 73 fixed to the left end portion of the support shaft portion 72, the second arm 74 fixed to the right end portion of the support shaft 44, and the push-pull link linking the first arm 73 and the second arm 74. It is equipped with 75, a tension spring 76, and the like. The first arm 73 is oscillated and urged in the forward tilting direction by the action of the tension spring 76, and is regulated by the contact portion 77, so that the guide member 42 is held in the rearward upward guide posture. The first operating lever 71 is pulled up and swung toward the rear and upper direction to swing the guide member 42 from the rearward ascending guide posture to the forward ascending direction against the urging force of the tension spring 76. Can be done.

During the mowing operation, if the mowing unit 34 is clogged with the mowing adhering to and accumulating on the guide member 42, the driver moves the first operation lever 71 in the vertical direction while sitting in the driver's seat 20. By rocking, the guide member 42 can be rocked in the vertical direction, and the mow that has adhered and accumulated can be removed.

[Grass collection duct]
Next, the duct 35 for collecting grass will be described.
As shown in FIGS. 3, 4, 5, and 8, a duct 35 for collecting grass, which is connected to the discharge unit 34 formed in the cutting blade housing 31 so as to communicate with the discharge unit 34 and guides the grass to be sent out from the discharge unit 34, is provided. Has been done. As shown in FIGS. 1 and 9, the duct 35 is provided in a state of extending in the front-rear direction in the space formed between the left and right transmission cases 14.

As shown in FIGS. 5, 8 and 9, the duct 35 includes a duct main body 45 and a bottom plate 46. The duct main body 45 has a ceiling surface 45a and side plates 46b on both the left and right sides, and is formed in an inverted U shape when viewed in the front-rear direction. A plate-shaped bottom plate 46 is provided so as to cover the lower part of the internal space formed by the duct main body 45. Therefore, similarly to the discharge portion 34 of the mower 4, a substantially rectangular tubular transport path extending diagonally upward and rearward is formed in the internal region surrounded by the duct main body 45 and the bottom plate 46.

As described above, the duct main body 45 is formed in an inverted U shape when viewed in the front-rear direction, and the side plate may be displaced outward in the lateral direction. Therefore, a gap suppressing member SY for pushing the side plate 45b of the duct main body 45 in the duct 35 toward the inward side in the lateral direction is provided. As shown in FIG. 9, the gap suppressing member SY is provided between the machine frame 10 located on the lateral outer side of the duct main body 45 and the side plate 45b of the duct main body 45. The gap suppressing member SY has a plurality of coil springs 23 and a plate body 24 or the like that pushes and operates the side plate 45b by the urging force of the coil springs 23. Since the side plate 45b is pushed inward in the lateral direction by the gap suppressing member SY, it is possible to prevent the side plate 45b from spreading outward.

Support members 47 in a fixed position are provided on both the left and right sides of the duct 35. Although not shown, the support member 47 is connected to the machine frame 10 or a member fixed to the machine frame 10 and is supported in a fixed position state. The bottom plate 46 in the duct 35 is supported by the left and right support members 47 so as to be vertically swingable around the second horizontal axis X2. That is, as shown in FIG. 8, the rotation support shaft 48 is provided in a state of being erected over the left and right support members 47. As shown in FIG. 5, the left and right support arms 49 are integrally extended from the lower surface of the bottom plate 46 toward the rear and lower sides. Boss portions 49A provided at the extended ends of the left and right support arms 49 are rotatably fitted and supported with respect to the rotation support shaft 48.

Then, the bottom plate 46 of the duct 35 is interlocked with the second operation lever 51 as a duct-side operation tool provided on the right side of the driver's seat 20 via the second linkage mechanism 50, and the second operation lever 51 is connected. It is configured so that it can be rotated by operating it. As shown in FIGS. 6 and 10, the second operating lever 51 is rotatably supported by the lateral shaft portion 51a, and is provided with a first arm 78 that is integrally rotated at the left end portion of the lateral shaft portion 51a. .. The second arm 79, which is connected to the rotating boss portion 49a of the support arm 49, is interlocked with the second arm 79 via the push-pull link 80. Therefore, when the second operating lever 51 is swung, the bottom plate 46 swings due to the linking structure of the second linking mechanism 50. As a result, similarly to the guide member 42, when the mowing is clogged inside the duct 35 due to the mowing work, the clogged mowing can be cleared and conveyed by reciprocating and swinging the second operation lever 51. can.

The bottom plate 46 of the duct 35 is configured so that the posture can be changed in conjunction with the raising and lowering operation of the mower 4, apart from the posture switching by the operation of the second operation lever 51. To add an explanation, as shown in FIGS. ing. The mower linkage mechanism 52 is provided so as to be located on the left outer side of the duct 35.

The mower linkage mechanism 52 includes a push-pull link 54 having one end interlocked with the left end of a support shaft 44 that supports the guide member 42, a fulcrum pin 55 provided on the support member 47, and a push-pull link 54. The first swing arm 56, whose other end is pivotally connected and swingably supported by the fulcrum pin 55, and the first swing arm 56, which is supported and swingably swingably by the fulcrum pin 55. It is provided with a second swing arm 57 whose end abuts on the lower surface of the bottom plate 46. The push-pull link 54 includes a turnbuckle portion 54a.

When the mower 4 rises, the support shaft 44 rises accordingly, and the push-pull link 54 is pushed to swing the first swing arm 56 and the second swing arm 57 to move the bottom plate 46 forward. Change the posture to the raised state (see Fig. 7). When the mower 4 descends, the support shaft 44 descends, the push-pull link 54 is pulled, the first swing arm 56 and the second swing arm 57 swing, and the bottom plate 46 is in a forward-down state. Change (see Fig. 5). As a result, it is possible to prevent the bottom plate 46 from being damaged due to the raising and lowering of the mower 4, and the grass cutting from being released from the gap between the guide member 42 and the bottom plate 46.

The bottom plate 46 of the duct 35 is in a mowing guide state (state shown in FIGS. 5 and 7) in which the front end portion is connected to the guide member 42 which is the bottom plate of the discharge portion 34, and the front end portion rotates upward to position the center of gravity G. Is provided so as to be swingable over the retracted state (state shown in FIG. 11) located behind the position of the second horizontal axis X2. That is, as shown in FIG. 11, when the bottom plate 46 is swung to the retracted state, the bottom plate 46 is in a state in which a rotational urging force acts toward the opposite side (rear side) from the mowing guide state due to its own weight. The position can be held in that posture even if the hand is released from the second operation lever 51.

When the mowing work is completed and the mowing remaining inside the discharge unit 34 is discharged to the outside, the bottom plate 46 of the duct 35 is switched to the retracted state to open the bottom portion of the discharge unit 34. By swinging the guide member 42, it can be easily discharged.

[Another Embodiment]
(1) In the above embodiment, the gap suppressing member for pushing the side plate 46b of the duct 35 inward in the lateral direction is provided, but such a member may not be provided.

(2) In the above embodiment, the bottom plate 46 of the duct 35 is provided so as to be switchable to a retracted state in which the front end portion rotates upward and the position of the center of gravity is located behind the second horizontal axis core position. As shown above, instead of this configuration, the bottom plate 46 of the duct 35 may always return to the mowing guide state when the hand is released from the second operation lever 51.

(3) In the above embodiment, the mower 4 is raised and lowered by operating the hydraulic cylinder 39, but instead of this configuration, for example, for raising and lowering the rear working device mounted on the rear part of the machine body. If it is provided with a lift arm, it may be configured to be linked with a link mechanism so as to raise and lower the mower with the raising and lowering operation of the lift arm.

(4) The mower may be configured to have a semi-crawler specification in which left and right crawlers are provided instead of the left and right rear wheels 3. Further, it may be configured to have an electric specification provided with an electric motor instead of the engine, or may be configured to have a hybrid specification provided with the engine 9 and the electric motor. Further, the mower may be provided with an automatic driving system and configured to be capable of automatic driving.

(5) The mower 4 may be configured to include a single blade 32 or three or more blades 32, or may be configured to include a disk-shaped cutting blade or the like instead of the blade 32.

The present invention can be applied to a mower in which a mower is suspended and supported so as to be able to move up and down via a link mechanism to a traveling machine.

4 Moor 5 Grass collecting container 31 Cutting blade housing 31A Vertical extension on the front side 31B Vertical extension on the rear side 32 Blade (cutting blade)
33 Transmission mechanism 34 Discharge part 35 Weed collection duct 36 Link mechanism 37A Front swing link 37B Rear swing link 42 Guide member (bottom plate)
45b Side plate 46 Bottom plate 51 Second operation lever (Duct side operation tool)
71 1st operating lever (Mower side operating tool)
G Center of gravity position SY Gap suppression member X1 1st horizontal axis core X2 2nd horizontal axis core

Claims (1)

The mower is suspended and supported by the traveling machine so that it can be raised and lowered via a link mechanism.
The mower is provided with a rotary-driven cutting blade, a cutting blade housing that covers the upper side of the cutting blade, and a transmission mechanism that is located above the cutting blade housing and transmits power to the cutting blade.
The link mechanism is provided with a front swing link located on the front side of the machine and a rear swing link located on the rear side of the machine.
A vertically extending portion extending upward from the upper surface of the cutting blade housing is erected at each of the front side portion and the rear side portion in the upper portion of the cutting blade housing.
One end of the swing link on the front side is swingably connected to the traveling machine body, and the other end is swingably connected to the upper part of the vertically extending portion on the front side.
One end of the swing link on the rear side is swingably connected to the traveling machine body, and the other end is swingably connected to the upper part of the vertically extending portion on the rear side.
A grass collecting duct for guiding the grass discharged from the discharging portion of the cutting blade housing to the rear of the vehicle body and a grass collecting container for storing the grass guided by the grass collecting duct are provided.
The bottom plate of the discharge portion is supported so as to be swingable up and down around the first horizontal axis by operating the operating tool on the mower side.
The bottom plate of the grass collecting duct, which is connected to the bottom plate of the discharge portion to form a grass guide surface, is supported so as to be swingable up and down around the second horizontal axis by operating the duct side operating tool.
The bottom plate of the grass collecting duct has a grass cutting guide state in which the front end is connected to the bottom plate of the discharge portion, and the front end is rotated upward so that the center of gravity is located behind the position of the second horizontal axis. It is provided so that it can swing over the retracted state.
A mower provided with a gap suppressing member that pushes the side plate of the grass collecting duct from the lateral outer side to the lateral inward side by an urging force .

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