JP2022030874A - Front mount type sulky mower - Google Patents

Abstract

To provide a front mount type sulky mower capable of reliably preventing the lowering of a mowing device by a simplified structure even when hydraulic oil leaks.SOLUTION: A front mount type sulky mower comprises: a lock member 51 for switching a posture of the front mount type sulky mower between a lock posture in which a lifting link 20 in a lifted up state, and a coupling frame 54 on a vehicle body are coupled, and the lifting link 20 is held to the coupling frame 54 in the lifted up state, and a lock release posture in which the coupling of the lifting link 20 and the coupling frame 54 is released, and the oscillation of the lifting link 20 is allowed. The lock member 51 is provided on the coupling frame 54.SELECTED DRAWING: Figure 4

Description

The present invention relates to a front mount type riding mower.

The front-mounted passenger mower includes a mowing device located in front of the vehicle body, an elevating link that extends from the vehicle body to the upper part of the mowing device so that it can swing up and down, and supports the mowing device so that it can be lifted and lowered. There is a hydraulic actuator that swings and operates. In this type of front-mounted passenger mower, the elevating link has a support portion that swingably supports the mowing device with the pivot axis in the direction along the width direction of the vehicle body as a swinging fulcrum. There is a configuration that can be switched between a descending state in which the bottom side is supported in a working posture in which the vehicle body faces forward and backward, and an ascending state in which the mowing device is supported in a maintenance posture in which the mowing device is raised to the ground and the bottom side is facing forward.
As a front-mounted type riding lawn mower of this type, for example, there is a front-mounted type riding lawn mower shown in Patent Document 1. This front-mounted passenger lawn mower is equipped with a mower as a mowing device and a hydraulic cylinder as a hydraulic actuator.

Japanese Unexamined Patent Publication No. 8-256556

In the above-mentioned front-mounted riding mower, the mower is supported by the elevating link in the maintenance posture, so that the mowing device can be easily maintained without being removed from the elevating link. In addition, it is possible to move and store the vehicle body in a state where the length of the mowing device protruding forward from the vehicle body is shorter than that during work. However, when hydraulic oil leaks in the hydraulic circuit linked to the hydraulic actuator, the elevating link goes down and the mowing device goes down. It may collide with a step. For maintenance, the tools on the work floor may be the underlay of the mowing equipment.

The present invention provides a front-mounted riding mower that can firmly prevent the mower from descending with a simple structure even if hydraulic oil leaks.

The front-mounted riding mower according to the present invention
The vehicle body, the mowing device located in front of the vehicle body, the elevating link extending from the vehicle body to the upper part of the mowing device so as to swing and move up and down, and supporting the mowing device so as to be able to move up and down, and the elevating link. A hydraulic actuator for swinging operation is provided, and the elevating link has a support portion that swingably supports the mowing device with a pivot axis in a direction along the width direction of the vehicle body as a swinging fulcrum. It is configured to be switchable between a descending state in which the mowing device is supported in a working posture in which the bottom surface side faces the front and back of the vehicle body, and an ascending state in which the mowing device is supported in a maintenance posture in which the bottom surface side faces forward while ascending to the ground. The lock posture in which the elevating link and the vehicle body in the ascending state are connected and the elevating link is held by the vehicle body in the ascending state, and the connection between the elevating link and the vehicle body are released, and the elevating link swings. A lock member capable of switching the posture to an unlocked posture is provided, and the lock member is mounted on the vehicle body or the elevating link.

According to this configuration, the elevating link that supports the mowing device in the maintenance posture can be fixed to the vehicle body by the lock member, so that even if the hydraulic oil leaks in the hydraulic circuit, the elevating link can be prevented from descending. Since the structure of the lock member can be fixed to a simple structure such as a hook structure for connecting the vehicle body and the elevating link, the elevating link can be firmly fixed to the vehicle body, so that the descent of the mowing device can be firmly prevented with a simple structure.

In the present invention
It is preferable that the lock member is mounted on the vehicle body.

According to this configuration, since the lock member is supported by the support portion on the fixed side, it is easier to equip the lock member so as not to interfere with the raising and lowering of the elevating link, as compared with the case where the lock member is supported by the elevating link on the movable side.

In the present invention
It is preferable that the lock member is mounted on the vehicle body so as to be able to swing up and down, and is configured to be in the locked posture by swinging down and to be in the unlocked posture by swinging up.

According to this configuration, in the normal state where the lock member is in the unlocked posture, the lock member is located at a higher position than in the locked posture, so that it is easy to prevent the lock member from becoming an obstacle to the ascending of the elevating link.

In the present invention
It is preferable that a spring for urging the lock member to the unlocked posture is provided.

According to this configuration, the lock member in the unlocked posture, which is located at a higher position than in the locked posture, can be firmly held in the locked posture by the spring so as not to change the posture to the locked posture due to vibration or the like.

It is a left side view which shows the whole of a float mount type riding mower. It is a left side view which shows the mowing device and the support structure of the mowing device. It is a top view which shows the mowing device and the support structure of a mowing device. It is a left side view which shows the mowing device of the maintenance posture. It is a top view which shows the support structure of a hook member. It is a side view which shows the hook member on the left of an ascending lock release posture. It is a side view which shows the right hook member of the ascending lock release posture.

Hereinafter, embodiments that are an example of the present invention will be described with reference to the drawings.
In the following description, regarding the vehicle body of the front mount type passenger grass mowing machine, the direction of the arrow F shown in FIGS. The direction of the arrow U shown in FIG. 3 is "upper body", the direction of arrow D is "lower side of the car body", the direction on the front side of the paper in FIG. 1, and the direction of the arrow L shown in FIG. The direction on the back side of the paper surface of No. 1 and the direction of the arrow R shown in FIG. 3 are defined as "the right side of the vehicle body".

[Overall configuration of front-mounted riding mower]
As shown in FIG. 1, the front mount type passenger mower is equipped with a pair of left and right front wheels 1 operably equipped, and a pair of left and right rear wheels 2 operably equipped, and is located in front of the vehicle body. The mowing device 10 is provided. A passenger-type driving unit 5 having a steering wheel 4 for steering and operating the driver's seat 3 and the rear wheels 2 is formed on the front portion of the vehicle body. A driving portion 7 having an engine 6 is formed at the rear portion of the vehicle body. A mission case 8 is provided below the driving unit 5. The mission case 8 contains a mission (not shown) in which the power from the engine 6 is input and the input power is output to the front wheels 1 and the mowing device 10. As shown in FIGS. 2 and 3, the elevating link 20 is extended forward from the mission case 8 constituting the vehicle body frame of the vehicle body so as to be able to swing up and down above the mowing device 10. The mowing device 10 is supported by the elevating link 20, and is operated by the elevating link 20 in both the descending working state and the ascending non-working state.

[Structure of mowing device]
As shown in FIGS. 1, 2, and 3, the mowing device 10 includes a cutting blade housing 11 and a support frame 24 provided above the cutting blade housing 11 to suspend and support the cutting blade housing 11. ing. Inside the cutting blade housing 11, three cutting blades 12 arranged in the width direction of the vehicle body are provided. The three cutting blades 12 have a rotary support shaft 13 extending in the vertical direction of the vehicle body, and are rotatably supported on the upper portion of the cutting blade housing 11 via the rotary support shaft 13. The ground ring 27 is supported by the front end portions of the left and right front-rear facing frames 25 of the support frame 24. The ground ring 27 is supported in a state where the mounting height with respect to the front-rear frame 25 can be adjusted. Anti-scalp rollers 14 are provided on the front outer side and the rear outer side of the cutting blade housing 11.

The support frame 24 has a left front-rear frame 25 located above the left end portion of the cutting blade housing 11 in a direction extending along the vehicle body front-rear direction, and a vehicle body front-rear direction above the right end portion of the cutting blade housing 11. It is located between the right front-rear frame 25 that extends in the direction along the vehicle body and the left-right front-rear frame 25 that extends in the direction along the width direction of the vehicle body, and connects the middle part of the left-right front-rear frame 25. It has a sideways frame 26 and the like.

The left and right front swing support rods 32, which are swayably supported by the support frame 24 by dividing them into the front portion 25a of the left front-rear facing frame 25 and the front portion 25a of the right front-rear facing frame 25, and the left The left and right rear swing support rods 34 are provided so as to be divided into a rear portion 25b of the front-rear facing frame 25 and a rear portion 25b of the right front-rear facing frame 25 and supported so as to be swingable. Each of the left and right front swing support rods 32 is slidably engaged with the long hole-shaped connecting hole 35a of the front support portion 35 erected at the front portion of the cutting blade housing 11 and the connecting hole 35a. It is connected to the front support portion 35 via a connecting shaft 32a provided at the free end portion of the front swing support rod 32. Each of the left and right rear swing support rods 34 is slidably engaged with the elongated hole-shaped connecting hole 36a of the rear support portion 36 erected at the rear portion of the cutting blade housing 11 and the connecting hole 36a. It is connected to the rear support portion 36 via a connecting shaft 34a provided at the free end portion of the rear swing support rod 34. The cutting blade housing 11 is suspended and supported by the left and right front swing support rods 32 and the left and right rear swing support rods 34 supported by the support frame 24.

As shown in FIGS. 2 and 3, the left and right front swing support rods 32 are one rotary support shaft used for supporting the left front swing support rod 32 and supporting the right front swing support rod 32. It is supported by the front-rear frame 25 via the 31. The left and right rear swing support rods 34 are supported by the front-rear frame 25 via individual support shafts 33 separately provided on the left and right rear swing support rods 34. The left front swing support rod 32 and the left rear swing support rod 34 are interlocked and connected by the left interlocking link 37, and the right front swing support rod 32 and the right rear swing support rod 34 are on the right. It is interlocked and linked by the interlocking link 38.

The mounting angle adjusting mechanism 40 is interlocked and connected to the left and right front swing support rods 32 and the left and right rear swing support rods 34. The mounting angle adjusting mechanism 40 is provided near the inside of the right front-rear facing frame 25 at a position on the front side of the side-facing frame 26. The mounting angle adjusting mechanism 40 is interlocked and connected to the left and right front swing support rods 32 by a rotary support shaft 31, a rotary support shaft 31 to the left rear swing support rod 34, and a left front swing support rod. It is interlocked and connected via 32 and the left interlocking link 37, and is interlocked and connected to the right rear swing support rod 34 via the rotary support shaft 31, the right front swing support rod 32 and the right interlocking link 38. .. The mounting angle adjusting mechanism 40 swings the left and right front swing support rods 32 and the left and right rear swing support rods 34 in conjunction with each other to swing the left and right front swing support rods 32 with respect to the support frame 24 and the mounting angles of the left and right front swing support rods 32. , The mounting angle of the left and right rear swing support rods 34 with respect to the support frame 24 is configured to be adjusted at once.

[Support for mowing equipment]
The elevating link 20 is composed of a pair of left and right elevating links 20. As shown in FIG. 3, the left elevating link 20 is extended so as to be swingable up and down from the left support shaft 20a provided in the lower part of the mission case 8. The right elevating link 20 is extended so as to be swingable up and down from the right support shaft 20a provided in the lower part of the mission case 8. As shown in FIGS. There is. A swing arm 22b for rotating the rotary support shaft 22a is provided on the rotary support shaft 22a that supports the pair of left and right lift arms 22 in an interlocking state. The hydraulic cylinder 21 is interlocked and connected to the swing arm 22b, and the left and right lift arms 22 are interlocked and connected to the hydraulic cylinder 21 via the rotary support shaft 22a and the swing arm 22b. The swing arm 22b and the hydraulic cylinder 21 are provided inside the mission case 8. The left and right elevating links 20 are interlocked with the hydraulic cylinder 21 via the lift link 23, the lift arm 22, the rotary support shaft 22a, and the swing arm 22b, and the support shaft is expanded and contracted by the expansion and contraction operation of the hydraulic cylinder 21 as a hydraulic actuator. The swing up / down operation is performed with 20a as the swing fulcrum.

As shown in FIG. 3, the connecting portion 26a is formed at the left end portion and the right end portion of the lateral frame 26 in the support frame 24. The left connecting portion 26a is connected to the support portion 20b formed at the tip of the left elevating link 20 via the pivot shaft 29, and the right connecting portion 26a is formed at the tip of the right elevating link 20. It is connected to the supported support portion 20b via a pivot shaft 29. The support portions 20b of the left and right elevating links 20 allow the mowing device 10 to swing with respect to the elevating link 20 with the pivot axis X extending in the lateral width direction of the vehicle body as a swing fulcrum.

When the support frame 24 in the mowing device 10 is supported by the left and right elevating links 20 and the left and right elevating links 20 are lowered by the shortening operation of the hydraulic cylinder 21, the mowing device 10 is lowered by the left and right elevating links 20. .. As shown in FIG. 2, when the mowing device 10 is lowered and the ground contact ring 27 hits the ground G, the mowing device 10 is in the descent work state, and the lower surface side of the mowing device 10 is near the ground G and faces the vehicle body back and forth. Become. The cutting blade housing 11 is maintained in a working state by suspension support by the left and right front swing support rods 32 and the left and right rear swing support rods 34 supported by the support frame 24. When performing mowing work, as shown in FIG. 2, the first lock pin 30 provided in the left connecting portion 26a is provided in the left elevating link 20 with the first pin hole 20c (see FIG. 4). In the left and right connecting portions 26a of the support frame 24, the second lock pin 28 is attached to the pin hole 26b (see FIG. 4) provided in the connecting portion 26a and the second pin hole 20d provided in the elevating link 20. As a result, the support frame 24 is locked so as not to swing with respect to the elevating link 20, and swinging with the pivot shaft 29 of the mowing device 10 as the swing fulcrum is prevented. When performing mowing work, by operating the mounting angle adjusting mechanism 40, the mounting angles of the left and right front swing support rods 32 and the left and right rear swing support rods 34 with respect to the support frame 24 are adjusted, and the cutting blade housing 11 is used. The hanging height can be changed and the mowing height can be adjusted. When the mounting angle adjusting mechanism 40 is operated to the ascending side of the cutting blade housing 11, the load of the cutting blade housing 11 is applied to the mounting angle adjusting mechanism 40, but the assist spring 45 connected to the left and right rear swing support rods 34. The raising operation of the cutting blade housing 11 is assisted.

When the left and right elevating links 20 are raised by the extension operation of the hydraulic cylinder 21, the mowing device 10 is raised by the left and right elevating links 20, and when the left and right elevating links 20 are raised to a set height such as a rising end, the mowing device 10 is in the ascending non-working state, and the lower surface side of the mowing device 10 is located above the ground G.

When performing maintenance of the mowing device 10, as shown in FIG. 4, the rotating shaft 9 (see FIG. 1) that transmits power to the mowing device 10 is removed from the mission case 8, and the first lock pin 30 is the left elevating link. The first pin hole 20c of the 20 is removed, the left and right second lock pins 28 are removed from the connecting portion 26a and the first pin hole 20c of the elevating link 20, and the elevating link 20 is operated in the ascending state. Then, the rear end side of the mowing device 10 can descend with the pivot axis X as a swinging fulcrum, the bottom surface side of the mowing device 10 faces forward, and the mowing device 10 floats to the ground in a maintenance posture. The mowing device 10 can be suspended and supported by the elevating link 20. Ascending to the ground includes not only ascending to the ground G but also ascending to a work floor other than the ground G. In this case, the support frame 24 is prevented from swinging with respect to the elevating link 20 by inserting the first lock pin 30 into the second pin hole 20d (see FIG. 4) provided in the elevating link 20 on the left. Is fixed by the first lock pin 30. It is possible to prevent the mowing device 10 from swinging with the pivot axis X as a swinging fulcrum.

When the mowing device 10 is supported by the elevating link 20 in the maintenance posture, if hydraulic oil leaks from the hydraulic circuit linked to the hydraulic cylinder 21, the left and right elevating links 20 are lowered and the mowing device 10 is lowered. As shown in 4, the hook member 51 as a lock member mounted on the vehicle body can prevent the mowing device 10 from descending.

That is, as shown in FIGS. 2 and 5, a driving unit frame 50 constituting the vehicle body frame of the vehicle body is provided at the lower part of the driving unit 5. The driving unit frame 50 includes a pair of left and right first driving unit frames 50a, a second driving unit frame 50b, and a connecting frame 54. The left and right first operating unit frames 50a are provided so as to extend forward and upward from the front portion of the mission case 8 and to connect the extended ends to the lower portion of the front portion of the operating unit floor 5a. The pair of left and right second operating unit frames 50b are extended forward and upward from the support shaft 20a provided in the mission case 8, and the extended end portion is behind the extended end portion of the first operating unit frame 50a. It is provided in a state of being connected to the lower part of 5a. The connection between the second driving unit frame 50b and the driving unit floor 5a is performed via the connecting seat portion 60. The connecting frame 54 is connected to an intermediate portion of the left and right first operating unit frames 50a and an intermediate portion of the left and right second operating unit frames 50b, and is connected to the left and right first operating unit frames 50a and the left and right second operating unit frames. 50b is connected.

As shown in FIG. 5, the hook member 51 is provided corresponding to each of the left and right elevating links 20. The left and right hook members 51 are pivotally supported by the support portion 54a via a support shaft 52 provided at the base of the hook member 51. The support portion 54a is formed on the connecting frame 54. The left and right hook members 51 are mounted on the connecting frame 54 in the driver frame 50 of the vehicle body.

As shown in FIGS. 5, 6 and 7, the left and right hook members 51 are interlocked and connected by a connecting member 53 connected to the base of the hook member 51, and are interlocked with the support shaft 52 as a swing fulcrum. It is supported in a state where it can be raised and lowered in both the descending lock posture and the ascending lock release posture. As shown in FIGS. 6 and 7, when the left and right hook members 51 are in the ascending release posture, the back portion of the hook member 51 hits and is supported by the connecting frame 54, and the posture is determined by the connecting frame 54 in the ascending unlocking posture. Will be done. The left and right hook members 51 are oscillated in an ascending / releasing posture by a spring 55 connected to the right hook member 51. As shown in FIG. 5, the left and right hook members 51 are attached to the operation pedal 58 via the connecting member 53, the link member 56 connected to the connecting member 53, and the operation cable 57 having one end connected to the link member 56. It is linked and linked. The operation pedal 58 is provided in the driving unit 5.

The left and right hook members 51 are switched between a downward lock posture and an upward lock release posture by the operation force of the operation pedal 58 and the operation force of the spring 55 by operating the operation pedal 58. Instead of the operation pedal 58, various operation tools such as an operation lever can be adopted.

As shown in FIG. 4, when the mowing device 10 is supported by the elevating link 20 in the maintenance posture, when the left and right hook members 51 are changed to the descent lock posture, the tips of the left and right hook members 51 are elevated and lowered. Engage with the lock pin 59 provided on the link 20. That is, when the left and right hook members 51 are in the descending lock posture, they are connected to the elevating link 20 via the lock pin 59, and are connected to the connecting frame 54 via the support shaft 52, and the elevating link 20 is connected. It is held by the connecting frame 54 in the raised state. Even if hydraulic oil leaks in the hydraulic circuit linked to the hydraulic cylinder 21, the hook member 51 prevents the left and right elevating links 20 from descending.

As shown in FIGS. 6 and 7, when the left and right hook members 51 are changed to the ascending lock release posture, the tips of the left and right hook members 51 are disengaged from the lock pin 59 of the elevating link 20, and the left and right hook members are released. The 51 disengages the connection with the elevating link 20 and disengages the connection with the connecting frame 54 to enable the elevating link 20 to move up and down. When the posture of the left and right hook members 51 is changed to the ascending lock release posture, the left and right hook members 51 are held by the spring 55 in the ascending lock releasing posture so as not to change the posture to the descending lock posture due to vibration or the like.

[Another Embodiment]
(1) In the above-described embodiment, an example is shown in which the cutting blade housing 11 is suspended and supported by the front swing support rod 32 and the rear swing support rod 34, but the present invention is not limited to this. For example, without the front swing support rod 32 and the rear swing support rod 34, the support frame 24 is pivotally supported by the support portion 20b of the elevating link 20 in a state of being fixed to the cutting blade housing 11, and the pivot shaft core X is provided. A support rod that can be switched between a state in which the cutting blade housing 11 is suspended and supported and a state in which the cutting blade housing 11 is released is provided over the left and right elevating links 20 and the cutting blade housing 11. May be good.

(2) In the above embodiment, an example in which the left and right hook members 51 are provided is shown, but the left and right elevating links 20 are interlocked via the left and right lift links 23, the left and right lift arms 22, and the rotary support shaft 22a. Since they are connected, only one hook member 51 that acts on only one of the left and right elevating links 20 may be provided.

(3) In the above-described embodiment, the example in which the hook member 51 is mounted on the connecting frame 54 in the driving section frame 50 of the vehicle body is shown, but the hook member 51 is mounted on the elevating link 20 and is engaged with the first driving section frame 50a. It may be taken off. In the above-described embodiment, an example in which the hook member 51 is adopted as the lock member is shown, but the present invention is not limited to this. For example, one end side may be supported by one of the driving unit frame 50 and the elevating link 20, and the other end side may be a rod that can be engaged with and detached from the other connecting hole of the operating unit frame 50 and the elevating link 20. As the vehicle body to which the lock member is connected, any vehicle body portion other than the driver frame 50 may be adopted.

(4) In the above-described embodiment, the hydraulic cylinder 21 is adopted, but the present invention is not limited to this, and a hydraulic motor may be adopted.

(5) In the above-described embodiment, the configuration in which the switching operation of the hook member 51 is performed by the driving unit is adopted, but a configuration in which the switching operation is performed outside the vehicle body may be adopted.

The present invention swings the mowing device located in front of the vehicle body, the elevating link extending from the vehicle body to the upper part of the mowing device so as to be able to swing up and down, and supporting the mowing device so that the mowing device can be lifted and lowered. It is equipped with a hydraulic actuator, and the elevating link is in a descending state that supports the mowing device in a working posture with the bottom side facing forward and backward, and in an ascending state that supports the mowing device in a maintenance posture that rises to the ground and the bottom side faces forward. It can be applied to a riding grass mowing machine that is configured to be switchable to and.

10 Mowing device 20 Elevating link 20b Support 21 Hydraulic actuator (hydraulic cylinder)
54 Body (connecting frame)
51 Lock member (hook member)
55 Spring X Pivot Jikushin

Claims (4)

With the car body
The mowing device located in front of the car body and
An elevating link that is extended from the vehicle body to the upper part of the mowing device so as to be able to swing up and down and supports the mowing device so as to be able to move up and down.
A hydraulic actuator for swinging the elevating link is provided.
The elevating link has a support portion that swingably supports the mowing device with the pivot axis in the direction along the width direction of the vehicle body as a swing fulcrum, and the bottom side of the mowing device faces the front and rear of the vehicle body. It is configured to be switchable between a descending state supported by the posture and an ascending state supporting the mowing device in a maintenance posture in which the mowing device is raised to the ground and the bottom surface side is facing forward.
The lock posture in which the elevating link in the ascending state and the vehicle body are connected and the elevating link is held by the vehicle body in the ascending state, and the connection between the elevating link and the vehicle body are released, and the elevating link is shaken. A lock member that can switch the posture to the unlocked posture that allows movement is provided.
The lock member is a front-mounted riding mower equipped on the vehicle body or the elevating link. The front-mounted riding mower according to claim 1, wherein the lock member is mounted on the vehicle body. The front mount type according to claim 2, wherein the lock member is mounted on the vehicle body so as to be able to swing up and down, and is configured to be in the locked posture by swinging down and to be in the unlocked posture by swinging up. Riding mower. The front-mounted riding mower according to any one of claims 1 to 3, further provided with a spring for urging the lock member to the unlocked posture.

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