JP2020089320A - Work unit - Google Patents

Abstract

To improve operability of a riding-over mechanism.SOLUTION: A work unit to be mounted on a lower side of a working machine having wheels includes: a work part; a housing for covering the work part; bridges 53 arranged at an upper side of the housing; auxiliary plates (51, 52) to be displaced between a storage state in the bridges 53 and a projection state from the bridges 53; link mechanisms 55 arranged in the bridges 53 and connected to the auxiliary plates (51, 52); and operation tools 56 for operating the link mechanisms 55. When the operation tool 56 is operated, the link mechanisms 55 are opened/closed, so that the auxiliary plates (51,52) are displaced between the storage state in the bridge 53 and the projection state from the bridge 53.SELECTED DRAWING: Figure 4

Description

The present invention relates to a work unit mounted between a front wheel and a rear wheel below a mid-mount work machine.

The mid-mount work machine includes a work unit that can be attached and detached. When working, the work unit is suspended between a front wheel and a rear wheel of the machine body so that it can be lifted and lowered. For maintenance and inspection of the work unit, the work unit is removed from the machine body. The work of connecting or disconnecting the work unit to or from the machine body in a narrow space between the front and rear wheels of the machine body is a heavy burden on the operator. For this reason, some work units are configured to have an overcoming mechanism. In the mid-mount type working machine, one of the front wheels or the rear wheels travels on a work-over mechanism of the working unit to arrange the working unit below the mid-mount type working machine. The ride-over mechanism is composed of a bridge portion provided on the upper part of the working machine and two auxiliary plates. During the operation of the work unit, the auxiliary plate is housed in the bridge portion. When the mid-mount work machine travels on the work unit, the auxiliary plate is suspended in the front-rear direction of the bridge unit so as to connect the bridge unit and the ground. The wheels of a mid-mount work machine travel in the order of one auxiliary plate, the bridge, and the other auxiliary plate.The mid-mount work machine straddles the work unit and works between the front and rear wheels. Place the unit.

JP, 2016-34257, A

However, in the conventional overcoming mechanism of the working unit, each of the two auxiliary plates housed in the bridge portion is fixed to the bridge portion by the pin. Therefore, when using the ride-over mechanism, it is necessary to remove each pin and manually pull out the auxiliary plate from the bridge portion, which is difficult to operate.

SUMMARY OF THE INVENTION It is an object of the present invention to improve the operability of a ride-over mechanism in order to solve the above problems.

In order to achieve the above object, a working unit according to an embodiment of the present invention is a working unit mounted below a working machine including wheels, and includes a working unit, a housing covering the working unit, and A bridge portion provided on the upper side of the housing, an auxiliary plate that is displaced into a state of being housed in the bridge portion and a state of protruding from the bridge portion, and a link mechanism provided in the bridge portion and connected to the auxiliary plate, An operating tool for operating the link mechanism is provided, and the link mechanism is opened and closed by operating the operating tool, and the auxiliary plate is displaced into a state of being housed in the bridge portion and a state of protruding from the bridge portion. To do.

With such a configuration, only by operating the operation tool, the link mechanism is opened and closed, and the auxiliary plate supported by the link mechanism is displaced between the housed state and the projected state (used state). Since the auxiliary plate can be easily displaced only by operating the operation tool, operability is improved.

Further, the operating tool may reciprocate, and the link mechanism may open and close according to the reciprocating operation of the operating tool.

With such a configuration, the link mechanism can be opened and closed according to a simple operation of the operation tool, so that the auxiliary plate can be displaced more easily and the operability is improved.

In addition, an elastic body connected to the bridge portion and an end region of the operating tool opposite to the bridge portion is provided, and when the operating tool reciprocates from one end to the other end, the elastic body, It is preferable that when the operating tool is at the one end, the operating tool is biased toward the one end, and when the operating tool is at the other end, the operating tool is biased toward the other end.

With such a configuration, after the operating tool reciprocates, the operating tool is held in that state by the elastic body, so that it is possible to prevent the operating tool from being operated unexpectedly and the auxiliary plate from malfunctioning.

Further, a working unit according to an embodiment of the present invention is a working unit mounted below a working machine including wheels, and includes a working part, a housing covering the working part, and a bridge provided on the upper side of the housing. A portion, a support portion connected to an end portion of the bridge portion and extending downward in a direction away from the bridge portion, and an auxiliary plate connected to the support portion and displaced in a direction extending from the support portion by its own weight. And a pin that holds the auxiliary plate in the state of being accommodated in the support part by being inserted from the auxiliary plate into the support part.

With such a configuration, the auxiliary plate can be held in the housed state by the pin, and the auxiliary plate can be protruded and displaced into the used state by only pulling out the pin. Thereby, the auxiliary plate can be easily displaced, and the operability is improved.

Further, the bridge portion is provided from a front end region to a rear end region in the front-rear direction along the longitudinal direction of the auxiliary plate of the housing, and as the auxiliary plates, a pair of front auxiliary plates that are displaced in opposite directions to each other. A rear auxiliary plate is preferably provided on the bridge portion side by side in the front-rear direction.

With such a configuration, the auxiliary plate can be provided so as to project at least forward and backward with respect to the work unit so that the work machine can get over the work unit. Therefore, the working machine can appropriately get over the working unit.

In addition, it is preferable that a plurality of the bridge portions including the auxiliary plate are provided side by side in the left-right direction intersecting the longitudinal direction of the auxiliary plate.

With such a configuration, the bridge portion can be provided according to the arrangement and the number of wheels of the working machine, so that the working machine can appropriately get over the working unit.

Further, the working unit may be a blade for mowing, and the working machine may be a mowing machine.

With such a configuration, it can be used not only for mowers but also for various work machines.

It is a schematic diagram which shows the basic structure of the mid mount type mower by this invention. It is a side view of a mower equipped with a mower unit. It is a perspective view of a mower unit. 3 is a schematic diagram illustrating an overall configuration of a ride-over mechanism according to the first embodiment. FIG. FIG. 3 is a schematic diagram illustrating a configuration of a main part in a stowed state of the ride-over mechanism according to the first embodiment. FIG. 3 is a schematic diagram illustrating a configuration of a main part in a use state of the ride-over mechanism according to the first embodiment. 9 is a schematic diagram illustrating the overall configuration of a ride-over mechanism according to Embodiment 2. FIG. FIG. 9 is a schematic diagram illustrating a configuration of a main part of a riding-over mechanism according to a second embodiment in a stored state. FIG. 7 is a schematic diagram illustrating a configuration of a main part in a use state of a ride-over mechanism according to the second embodiment. FIG. 10 is a schematic diagram illustrating the overall configuration of a ride-over mechanism according to the third embodiment.

First, a mid-mount work machine equipped with a working unit will be described with reference to FIGS. 1 and 2 by taking a mid-mount mower equipped with a mower unit (hereinafter, simply referred to as a mower) as an example. In the following description, the straight forward direction of the mower is referred to as the front and the straight backward direction is referred to as the rear. The direction intersecting the front-back direction is referred to as the left-right direction or the cross-machine direction, and the left-right direction indicates the direction in which the front direction is faced.

FIG. 1 shows an elevating link mechanism 3 mounted on a main frame 10 which is a basic structure of this mower, and a mower unit 4 mounted on the elevating link mechanism 3 as the mower moves in the front-rear direction. The state before and after mounting is schematically shown. An elevating link mechanism 3 including a pair of left and right front links 31 and a rear link 32 is provided at the bottom of the machine body. The intermediate frame 6 is suspended by the free end of the front link 31 and the free end of the rear link 32. The free end of the front link 31 and the free end of the rear link 32 are connected to the intermediate frame 6 via a swing axis, and the swing of the lifting link mechanism 3 causes the intermediate frame 6 to be displaced up and down with respect to the ground. The intermediate frame 6 is provided with an engaging portion 610, and the blade housing 40 (corresponding to a housing) of the mower unit 4 is provided with an engaged portion 620 that can be connected to the engaging portion 610.

As shown in FIG. 1, when the front wheel 2a gets over the mower unit 4 with an appropriate positional relationship, the engaged portion 620 of the blade housing 40 engages with the engaging portion 610 of the intermediate frame 6. As a result, the blade housing 40 and the intermediate frame 6 are connected, and as a result, the mower unit 4 and the mower body are connected. A lock mechanism 8 is provided which locks the coupling position (engaged state) of the engaged portion 610 and the engaged portion 620 realized here and mechanically holds the locked state. Although the constituent members of the lock mechanism 8 are only schematically shown in FIG. 1, they are accommodated within the range of the intermediate frame 6 in a plane view of the machine body.

Further, in order to transmit the rotational power from the engine 23 to the mower unit 4 mounted on the main frame 10, the blade power transmission mechanism 25 is set to a connected state capable of transmitting power. The blade power transmission mechanism 25 is composed of an airframe side power transmission mechanism 25A and a mower side power transmission mechanism 25B which are separated or connected by the power connection mechanism 7.

One of the embodiments of this mower is shown in FIG. In this mower equipped with the mower unit 4 between the front wheels 2a and the rear wheels 2b, a water-cooled engine (diesel engine) 23 covered with a bonnet 11 is mounted on the front half of the main frame 10. The driver's seat 21 is arranged in the latter half of the main frame 10. The front wheels 2a are steered wheels that are operated by the steering wheel 22, and at the same time are driving wheels. It is a four-wheel drive, and the rear wheels 2b are also drive wheels. A transmission case 13 is provided in the latter half of the main frame 10.

Further, as shown in FIG. 3, the mower unit 4 includes three blades for mowing (corresponding to a working unit (not shown)) that are arranged in the machine transverse direction in a plan view and rotate clockwise, and these blades. And a blade housing (corresponding to a housing) 40 that covers the blade from above. The blade housing 40 has a top plate 41 and side plates 42 extending downward from the peripheral edge of the top plate. A power distribution mechanism 44 for driving the blade is provided on the top plate 41 of the blade housing 40. The blade housing 40 forms a conveyance path for cutting grass in the blade housing 40 by forming a bulging portion in the front region in the left and right directions upward. A discharge cover 40a is attached to the right end of the blade housing 40 that serves as a discharge port of the transport path.

Next, a configuration in which the mower unit 4 is installed in the mower will be described with reference to FIGS. When the mower unit 4 is mounted on the airframe, the mower according to the present invention travels forwards over the mower unit 4 placed laterally on the ground. For this reason, the overriding mechanism 5 is provided in the blade housing 40. The ride-over mechanism 5 is prepared for each of the left and right front wheels 2a, and the interval thereof corresponds to the front wheel tread width. The ride-over mechanism 5 extends in the front-rear direction above the belt transmission mechanism 44c arranged on the top plate 41 of the blade housing 40, and extends from the front end of the bridge portion 50 so as to incline toward the ground. It comprises a front auxiliary plate 51 (corresponding to an auxiliary plate) and a rear auxiliary plate 52 (corresponding to an auxiliary plate) that extends from the rear end of the bridge portion 50 toward the ground. The width of the bridge portion 50 is set so as to avoid interference with the subframe 20 of the mower and to allow the left and right front wheels 2a to ride stably. The detailed structure of the ride-over mechanism 5 will be described later with reference to FIGS.

To equip the lower abdomen of the tractor with the mower unit 4, first, the lifting link mechanism 3 is operated to lower the intermediate frame 6 to the lower limit position. Subsequently, the front wheels 2a ride on the rear auxiliary plate 52 from the rear of the mower unit 4, pass through the bridge portion 50 and the front auxiliary plate 51 above the blade housing 40, and advance the aircraft so as to get over the blade housing 40. When the front wheel 2a gets over the blade housing 40, the machine body is stopped, and the engaged portion 620 provided on the blade housing 40 and the engaging portion 610 provided on the intermediate frame 6 are engaged with each other.

After stopping the machine body, the operator swings an operation lever (not shown) to bring the blade power transmission mechanism 25 into a connected state capable of transmitting power. Further, the lock mechanism 8 fixes the machine body and the mower unit 4 to each other.

When the mower unit 4 is detached from the machine body, after the elevating link mechanism 3 is lowered so that the mower unit 4 is grounded, the driver operates the operation lever (not shown) to move the blade power transmission mechanism 25. To leave. Further, the lock mechanism 8 is released, and the fixing of the airframe and the mower unit 4 is released. Next, the overriding mechanism 5 is used to retract the aircraft so as to get over the mower unit 4. Through this backward movement, the engaging portion 610 provided on the intermediate frame 6 comes out of the engaged portion 620 provided on the blade housing 40. When the front wheel 2a gets over the blade housing 40, the mower unit 4 becomes free, so that the airframe can be freely separated and moved.

Hereinafter, a specific configuration example of the ride-over mechanism 5 will be described as an embodiment.

[Embodiment 1]
The configuration of the ride-over mechanism according to the first embodiment will be described with reference to FIGS. 4 to 6. 4 to 6, a part of the bridge portion is shown by a chain double-dashed line, and the internal structure is transparently disclosed.

As shown in FIG. 4, the ride-over mechanism 5 is provided on the blade housing 40 (hereinafter, see FIG. 3) and above the mower unit 4 (hereinafter, see FIG. 3). As illustrated in FIG. 3, the ride-over mechanism 5 is provided in two places side by side in the left-right direction in order for the left and right front wheels 2a (hereinafter, see FIG. 1) to get over. Each of the ride-over mechanisms 5 includes a bridge portion 53 fixed to the upper part of the mower unit 4, and a pair of auxiliary plates, a front auxiliary plate 51 and a rear auxiliary plate 52. The bridge portion 53 includes a storage portion 54 that stores the front auxiliary plate 51 and the rear auxiliary plate 52, and a link mechanism 55. The front auxiliary plate 51 and the rear auxiliary plate 52 are normally accommodated in the accommodating portion 54 (see FIG. 5 ), and project outwardly when the ride-over mechanism 5 is used to form a slope over which the front wheel 2 a rides (see FIG. 6 ). .. The link mechanism 55 is connected to the inner ends of the front auxiliary plate 51 and the rear auxiliary plate 52, respectively, and the link mechanism 55 operates to store the front auxiliary plate 51 and the rear auxiliary plate 52 in the storage portion 54 ( In the following, it can be displaced into a housed state) and a state of protruding from the bridge portion 53 (hereinafter referred to as a used state). Further, the link mechanism 55 is provided with a lever 56 (corresponding to an operating tool), and the link mechanism 55 operates in accordance with the operation of the lever 56 to displace the front auxiliary plate 51 and the rear auxiliary plate 52.

The link mechanism 55 includes a front first arm 57a, a front second arm 58a, a lever plate 59, a rear first arm 57b, and a rear second arm 58b.

The front first arm 57a is connected to the front auxiliary plate 51. The support pin 49a is inserted through one end region of the front first arm 57a and one end region of the front auxiliary plate 51, and the front first arm 57a and the front auxiliary plate 51 rotate relative to each other about the support pin 49a. Supported in a possible manner. The other end region of the front auxiliary plate 51 comes into contact with or approaches the ground or the like when protruding. The front first arm 57a is provided with openings 45a and 45b in the other end region. The support pin 49b is inserted through the opening 45a of the front first arm 57a and one end region of the front second arm 58a, and the front first arm 57a and the front second arm 58a are relatively positioned with respect to the support pin 49b. It is supported in a rotatable manner. The lever plate 59 is supported by the support portion 49c fixed to the side wall of the bridge portion 53 and rotatably about the support pin 49c. The support pin 49d is inserted through the other end region of the front second arm 58a and the lever plate 59, and the front second arm 58a is supported rotatably about the support pin 49d. The lever 56 is fixed to the other end of the support pin 49c whose one end is instructed by the bridge portion 53 so as to be rotatable around the support pin 49c. The lever 56 is an operation tool for displacing the front auxiliary plate 51 and the rear auxiliary plate 52 into the stored state and the used state. The lever plate 59 actuates the link mechanism 55 in accordance with the turning operation of the lever 56, and displaces the front auxiliary plate 51 and the rear auxiliary plate 52 into the stored state and the used state. The operating range of the lever plate 59 is restricted by the restricting pin 48a and the restricting pin 48b, and when the lever plate 59 is displaced to the position where it abuts against the restricting pin 48a, the front auxiliary plate 51 and the rear auxiliary plate 52 will be moved. When the lever plate 59 is displaced to the use state and is displaced to the position where the lever plate 59 contacts the regulation pin 48b, the front auxiliary plate 51 and the rear auxiliary plate 52 are displaced to the stored state.

Further, the rear first arm 57b is connected to the rear auxiliary plate 52. The support pin 49a is inserted through one end region of the rear first arm 57b and one end region of the rear auxiliary plate 52, and the rear first arm 57b and the rear auxiliary plate 52 rotate relative to each other about the support pin 49a. Supported in a possible manner. The other end region of the rear auxiliary plate 52 comes into contact with or approaches the ground or the like when protruding. The rear first arm 57b is provided with openings 45a and 45b in the other end region. The support pin 49b is inserted through the opening 45b of the rear first arm 57b and the one end region of the rear second arm 58b, and the rear first arm 57b and the rear second arm 58b are relatively positioned with the support pin 49b as the center. It is supported in a rotatable manner. The support pin 49d is inserted through the other end region of the rear second arm 58b and the lever plate 59, and the rear second arm 58b is supported rotatably about the support pin 49d.

When the lever 56 is rotated to a position where it is in contact with the regulation pin 48b, the lever 56 is stored, and the link mechanism 55 is folded and connected to the front auxiliary plate 51 and the rear auxiliary plate as shown in FIG. The plate 52 is stored in the storage portion 54.

When the lever 56 rotates from the restriction pin 48a toward the restriction pin 48b, the second front arm 58a moves in a direction approaching the lever 56 as the lever plate 59 rotates. Here, a regulation pin 48c is provided on the side wall of the storage portion 54. The second front arm 58a moves while contacting the restriction pin 48c, and the movement is restricted by the restriction pin 48c. When the lever 56 rotates from the regulation pin 48a toward the regulation pin 48b, the portion of the front second arm 58a supported by the support pin 49d moves downward, but the movement is regulated by the regulation pin 48c. Therefore, the portion of the front second arm 58a supported by the support pin 49b moves upward. That is, the second front arm 58a rotates about the restriction pin 48a. With the rotation of the second front arm 58a, the first front arm 57a moves toward the lever 56. Here, a regulation pin 48e and a regulation pin 48f are provided on the side wall of the storage portion 54. The movement of the front auxiliary plate 51 is regulated by the regulation pins 48e and 48f, and the movement of the front first arm 57a connected to the front auxiliary plate 51 is also regulated. As a result, the front first arm 57a rotates about 180° around the support pin 49a as the front second arm 58a rotates. Along with this, the portion of the front auxiliary plate 51 supported by the support pins 49a moves toward the lever 56, and the front auxiliary plate 51 is stored in the storage portion 54. Further, a claw 47 is provided at the tip of each of the first front arm 57a and the first rear arm 57b, and a hole 46 is provided in each of the front auxiliary plate 51 and the rear auxiliary plate 52. In the housed state, the claw 47 is inserted into the hole 46, and the front auxiliary plate 51 and the rear auxiliary plate 52 are restricted from unintentionally protruding.

Similarly, when the lever 56 rotates from the restriction pin 48a toward the restriction pin 48b, the rear auxiliary plate 52 is displaced to the stored state. In the rear auxiliary plate 52, the displacement of the support pin 49b is restricted within the opening 45b while the movement of the rear auxiliary plate 52 is restricted by the restriction pin 48g provided on the side wall of the storage portion 54. As a result, the first rear arm 57b rotates about the support pin 49b, and the rear auxiliary plate 52 is stored in the storage portion 54.

Further, when the lever 56 is rotated to a position where it is in contact with the regulation pin 48a, the lever 56 is in a use state, and as shown in FIG. The auxiliary plate 51 and the rear auxiliary plate 52 project from the storage portion 54.

When the lever 56 rotates from the restriction pin 48b toward the restriction pin 48a, the front first arm 57a and the rear first arm 57b rotate around the support pin 49b, and the claw 47 is disengaged from the hole 46. Thereafter, the portions of the front first arm 57a and the rear first arm 57b supported by the support pins 49a extend outward (in the front-rear direction), and the front auxiliary plate 51 and the rear auxiliary plate 52 project from the storage portion 54 for use. It becomes a state.

As described above, according to the configuration of the first embodiment, only by rotating the lever 56, the link mechanism 55 is opened and closed, and the front auxiliary plate 51 and the rear auxiliary plate 52 are easily moved between the stored state and the used state. Can be displaced.

[Embodiment 2]
The configuration of the ride-over mechanism according to the second embodiment will be described with reference to FIGS. 7 to 9.

As shown in FIG. 7, the ride-over mechanism 5 is provided on the blade housing 40 (hereinafter, see FIG. 3) and above the mower unit 4 (hereinafter, see FIG. 3). As illustrated in FIG. 3, the ride-over mechanism 5 is provided in two places side by side in the left-right direction in order for the left and right front wheels 2a (hereinafter, see FIG. 1) to get over. Each of the rideover mechanisms 5 includes a bridge portion 63 fixed to the upper part of the mower unit 4, a link mechanism 65, and a front auxiliary plate 51 and a rear auxiliary plate 52 which are a pair of auxiliary plates. The bridge portion 63 includes two side walls arranged in the left-right direction, and includes a storage portion 64 that stores the front auxiliary plate 51 and the rear auxiliary plate 52. The front auxiliary plate 51 and the rear auxiliary plate 52 are normally accommodated in the accommodating portion 64, and project outwardly when the overpass mechanism 5 is used, and serve as a slope over which the front wheel 2a passes. The link mechanism 65 is connected to the inner ends of the front auxiliary plate 51 and the rear auxiliary plate 52, respectively, and the link mechanism 65 operates to store the front auxiliary plate 51 and the rear auxiliary plate 52 in the storage section 64 ( Hereinafter, it can be displaced to a state where it is housed) and a state where it projects from the bridge portion 63 (hereinafter referred to as a used state). Further, the link mechanism 65 is provided with a lever 66 (corresponding to an operating tool), and the link mechanism 65 operates in accordance with the operation of the lever 66 to displace the front auxiliary plate 51 and the rear auxiliary plate 52.

The link mechanism 65 includes arms 67 provided at the front and rear, and a rotating lever 68 for rotating each arm 67. One end of one of the pair of arms 67 is connected to the front auxiliary plate 51 via a support pin 49e, and the arm 67 and the front auxiliary plate 51 are relatively rotatable about the support pin 49e. One end of the other of the pair of arms 67 is connected to the rear auxiliary plate 52 via a support pin 49e, and the arm 67 and the rear auxiliary plate 52 are relatively rotatable about the support pin 49e. The other end of each arm 67 is supported on the side wall of the bridge portion 63 via the support pin 49f in a rotatable manner integrally with the support pin 49f. The support pin 49f is supported in such a manner that it can be integrated with the rotary lever 68, and when the rotary lever 68 rotates, the support pin 49f also rotates in the same direction and the arm 67 also rotates in the same direction. The rotary lever 68 is processed into an L-shape, and its tip is bent in the direction of the lever 66 and protrudes.

The lever 66 is supported on the side wall of the bridge portion 63 via a lever stay 66a. The lever 66 also includes a pair of protrusions 66b that protrude in the front-rear direction. The protrusion 66b rotates as the lever 66 reciprocates in the vertical direction. Specifically, the protruding portion 66b is a member in which a rod-shaped member is processed into a U shape, one end of the rod-shaped protruding portion 66b is fixed to the lever main body 66c, and the other end of the rod main body 66c is rotatable. And is supported by the lever body 66c. The protruding portion 66b is in contact with the protruding portion of the rotating lever 68, the rotational force of the protruding portion 66b is transmitted to the rotating lever 68, and the rotating lever 68 also rotates as the protruding portion 66b rotates.

In the ride-over mechanism 5 including the link mechanism 65 and the lever 66, when the lever 66 is pushed upward, the protrusion 66b rotates. When the protrusion 66b rotates, the protrusion 66b presses the rotation lever 68 to rotate the rotation lever 68. Along with the rotation of the rotary lever 68, the arm 67 also rotates such that the portion connected to the front auxiliary plate 51 (rear auxiliary plate 52) rotates in the front (rear) direction (inward). As the arm 67 rotates, the front auxiliary plate 51 and the rear auxiliary plate 52 are displaced inward in the front-rear direction, and the front auxiliary plate 51 and the rear auxiliary plate 52 are stored in the storage portion 64. This state is the stored state.

On the contrary, when the lever 66 is pushed down, the protrusion 66b rotates. When the protrusion 66b rotates, the protrusion 66b presses the rotation lever 68 to rotate the rotation lever 68. Along with the rotation of the rotary lever 68, the arm 67 also rotates such that the portion connected to the front auxiliary plate 51 (rear auxiliary plate 52) rotates backward (forward) (outward). As the arm 67 rotates, the front auxiliary plate 51 and the rear auxiliary plate 52 project outward in the front-rear direction to form a slope. This state is the use state.

As described above, also with the configuration of the second embodiment, the link mechanism 65 is opened and closed only by operating the lever 66 in the vertical direction, and the front auxiliary plate 51 and the rear auxiliary plate 52 are moved between the stored state and the used state. , Can be easily displaced.

Further, in the riding over mechanism 5 according to the second embodiment, the lever 66 may be provided with an elastic body such as a tension spring 69 over the side wall of the lever body 66c and the bridge portion 63. By providing the tension spring 69, an urging force that pulls the lever main body 66c toward the bridge portion 53 side acts above the lever 66 when the lever 66 is positioned above. Further, when the lever 66 is located below, an urging force that pulls the lever main body 66c toward the bridge portion 53 side acts on the lower side of the lever 66. As a result, the posture of the lever 66 is maintained in a state where the lever 66 is positioned at the upper and lower sides, and the lever 66 is prevented from malfunctioning due to a weak external force such as vibration.

[Embodiment 3]
The configuration of the ride-over mechanism according to the third embodiment will be described with reference to FIG. Note that, in FIG. 10, a state in which the front auxiliary plate 51 and the rear auxiliary plate 52 are projected is indicated by a chain double-dashed line.

As shown in FIG. 10, the ride-over mechanism 5 is provided on the blade housing 40 (hereinafter, see FIG. 3) and above the mower unit 4 (hereinafter, see FIG. 3). As illustrated in FIG. 3, the ride-over mechanism 5 is provided in two places side by side in the left-right direction in order for the left and right front wheels 2a (hereinafter, see FIG. 1) to get over. Each of the ride-over mechanisms 5 includes a bridge portion 73 fixed to the upper part of the mower unit 4, a fixing pin 43 (corresponding to a pin), and a front auxiliary plate 51 and a rear auxiliary plate 52 which are a pair of auxiliary plates.

The bridge portion 73 includes a front storage portion 74 and a rear storage portion 75 (both correspond to a support portion). The front storage portion 74 projects obliquely forward and downward, and the rear storage portion 75 projects obliquely rearward and downward. The front storage portion 74 and the rear storage portion 75 each include two parallel side walls, and the side walls include an opening portion 76 extending parallel to the projecting direction.

The front auxiliary plate 51 and the rear auxiliary plate 52 are supported by the support pin 77 in the front storage part 74 and the rear storage part 75 at one end thereof. The support pin 77 is provided so as to penetrate the openings 76 of the front auxiliary plate 51 and the rear auxiliary plate 52 and the side walls of the front storage part 74 and the rear storage part 75.

Each of the front auxiliary plate 51 and the rear auxiliary plate 52 has an opening 39 in the upper end region thereof. In the stored state, the front auxiliary plate 51 and the rear auxiliary plate 52 are pulled up along the front storage portion 74 and the rear storage portion 75, respectively. Then, the fixing pin 43 is inserted so as to penetrate the openings 39 and the openings 76 of the front auxiliary plate 51 and the rear auxiliary plate 52. When the front auxiliary plate 51 and the rear auxiliary plate 52 slide down to the state where the fixing pin 43 contacts the lower end of the opening 76, the front auxiliary plate 51 and the rear auxiliary plate 52 are held in this state. This state is the stored state.

When displacing the front auxiliary plate 51 and the rear auxiliary plate 52 to the use state, the fixing pin 43 is pulled out. By pulling out the fixing pin 43, the front auxiliary plate 51 and the rear auxiliary plate 52 further slide down due to their own weight along the front storage part 74 and the rear storage part 75, respectively (indicated by a chain double-dashed line in the figure). The front auxiliary plate 51 and the rear auxiliary plate 52 that slide down stop when the support pin 77 comes into contact with the lower end of the opening 76. As a result, the front auxiliary plate 51 and the rear auxiliary plate 52 form a slope and are in a use state.

As described above, also with the configuration of the third embodiment, the front auxiliary plate 51 and the rear auxiliary plate 52 slide down due to their own weight only by pulling out the fixing pin 43, and the front auxiliary plate 51 and the rear auxiliary plate 52 are used from the stored state. It can be easily displaced to the state. Further, the number of parts can be reduced and the burden on manufacturing can be reduced as compared with the overpass mechanism 5 of the first and second embodiments.

In each of the above embodiments, the mid-mount work machine such as a mowing machine is not limited to four wheels, and may be three wheels or five or more wheels. Further, not only the wheels but also crawlers may be equipped. The riding mechanism 5 is provided according to the number of front wheels or crawlers arranged in the left-right direction. For example, when the number of front wheels is one, one get-over mechanism 5 is provided, and when the number of front wheels is three, three get-over mechanisms 5 are provided.

Further, the front auxiliary plate 51 and the rear auxiliary plate 52 may have a structure in which two plates are superposed and extendable. In the housed state, the plates forming the front auxiliary plate 51 and the rear auxiliary plate 52 are stacked, and in the used state, the plates forming the front auxiliary plate 51 and the rear auxiliary plate 52 protrude from one side. And This makes it possible to store the front auxiliary plate 51 and the rear auxiliary plate 52 in a compact size while ensuring a sufficient length in the use state.

Further, not only in the case where the mid-mount work machine gets over the mower unit by moving forward, the ride-over mechanism 5 is provided according to the number of rear wheels arranged in the left-right direction, and the mid-mount work machine gets over the mower unit by going backward. May be.

INDUSTRIAL APPLICABILITY The present invention can be applied to various work units such as a mower unit mounted on a mid-mount work machine.

2a front wheel 2b rear wheel 4 mower unit (work unit)
5 Overpass mechanism 40 Blade housing (housing)
43 Fixed pin (pin)
51 Front auxiliary plate (auxiliary plate)
52 Rear auxiliary plate (auxiliary plate)
53 bridge part 55 link mechanism 56 lever (operation tool)
69 Extension spring (elastic body)
73 Bridge 74 Front storage (support)
75 Rear storage section (support section)

Claims (7)

A working unit mounted below a working machine equipped with wheels,
Working part,
A housing for covering the working part,
A bridge portion provided on the upper side of the housing,
An auxiliary plate that is displaced into a state of being accommodated in the bridge portion and a state of protruding from the bridge portion,
A link mechanism provided in the bridge portion and connected to the auxiliary plate,
An operating tool for operating the link mechanism,
A working unit in which the link mechanism is opened and closed by operating the operation tool, and the auxiliary plate is displaced into a state of being housed in the bridge portion and a state of protruding from the bridge portion. The working unit according to claim 1, wherein the operating tool reciprocates, and the link mechanism opens and closes according to the reciprocating operation of the operating tool. An elastic body connected to the bridge portion and the end region on the opposite side of the bridge portion of the operation tool,
When the operating tool reciprocates from one end to the other end, the elastic body biases the operating tool toward the one end when the operating tool is at the one end, and the operating tool moves toward the other end. The work unit according to claim 2, wherein the operating tool is biased toward the other end at a certain time. A working unit mounted below a working machine equipped with wheels,
Working part,
A housing for covering the working part,
A bridge portion provided on the upper side of the housing,
A support portion that is connected to an end portion of the bridge portion and extends downward in a direction away from the bridge portion,
An auxiliary plate that is connected to the support portion and that is displaced by its own weight in a direction extending from the support portion;
A working unit comprising: a pin that holds the auxiliary plate in a state of being accommodated in the support part by being inserted from the auxiliary plate into the support part. The bridge portion is provided from the front end region to the rear end region in the front-rear direction along the longitudinal direction of the auxiliary plate of the housing, and as the auxiliary plates, a pair of front auxiliary plates and rear auxiliary plates that are displaced in opposite directions to each other. The work unit according to any one of claims 1 to 4, wherein a plate and the bridge are provided side by side in the front-rear direction. The working unit according to any one of claims 1 to 5, wherein a plurality of the bridge portions including the auxiliary plate are provided side by side in a left-right direction intersecting a longitudinal direction of the auxiliary plate. The working unit according to claim 1, wherein the working unit is a blade for mowing, and the working machine is a mowing machine.

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