JP2022102978A - Sulky lawn mower - Google Patents

Abstract

To provide a sulky lawn mower to/from which a mower unit can be easily attached and detached.SOLUTION: A sulky lawn mower comprises a travel vehicle body 2 and a mower unit 1 provided on a travel vehicle body 2. The mower unit 1 comprises: a deck part 10 on which a mower mechanism 11 for cutting grass is provided; front wheel parts 12 which are provided on a front side of the deck part 10 and come into contact with a ground surface in grass cutting work; a front wheel arm part 13 which is coupled to the front wheel parts 12 on a front end side and is provided on the deck part 10 in a manner of capable of oscillating; a cutting height cylinder 17 which is coupled to the front wheel arm part 13 through a link mechanism 16, and changes a positional relationship between lower end parts of the front wheel parts 12 and the lower end of the deck part 10; and a lifting arm 15 which couples a lifting cylinder 17 for lifting the deck part 10 and the deck part 10. A coupling shaft 40 of the lifting arm 15 and a coupling shaft 40 of the cutting height cylinder 17 are provided on a same shaft, and the cutting height cylinder 17 and the lifting arm 15 are rotatably attached to the deck part 10 by penetrating a single fulcrum pin 41 therein.SELECTED DRAWING: Figure 3

Description

The present invention relates to a passenger lawn mower.

A passenger lawn mower connected to an elevating cylinder via an elevating arm is known as a mowing device having a floor on which a driver gets on the front of a traveling vehicle body and a lawn mowing device below the floor. 1).

Japanese Unexamined Patent Publication No. 2019-24437

In a passenger lawn mower with such a conventional configuration, the pin connecting the mower deck and the elevating arm was completely pulled out and removed during the desorption work of the mower deck, but it is necessary to manage the pin to prevent it from being dropped or lost. There was room for improvement in workability.

An object of the present invention is to provide a riding lawn mower to which a mower unit can be easily attached and detached.

The first invention is
With the running body
A mower unit provided on the traveling vehicle body is provided.
The mower unit
The deck part where the grass mowing mechanism is installed and the mowing mechanism
A front wheel portion provided in front of the deck portion and grounded during mowing work, and a front wheel portion.
A front wheel arm portion that is connected to the front wheel portion on the front end side and is provided on the deck portion so as to be swingable.
A cutting height cylinder that is connected to the front wheel arm portion via a link mechanism and changes the positional relationship between the lower end of the front wheel portion and the lower end of the deck portion.
Equipped with an elevating cylinder that elevates and elevates the deck portion and an elevating arm that connects the deck portion.
The connecting shaft of the elevating arm and the connecting shaft of the cutting height cylinder are provided on the same shaft.
It is a riding lawn mower characterized in that the cutting height cylinder and the elevating arm are rotatably attached to a deck portion by penetrating a single fulcrum pin.

The second invention is
A first connecting stay for rotatably attaching the front wheel arm portion around the first connecting fulcrum is provided between the cutting height cylinder and the elevating arm.
It is the first riding lawn mower of the present invention that allows the fulcrum pin to penetrate the first connecting stay as well.

According to the first invention, since the fulcrum pin can be shared, the number of parts can be reduced. In addition, the mower unit can be easily attached and detached by removing it from the elevating arm without completely removing the fulcrum pin.

According to the second invention, the fulcrum pin can be stably penetrated and can be easily inserted and removed, so that the mower unit can be easily attached and detached.

Side view of a riding lawn mower according to an embodiment of the present invention Perspective view of the mower unit of the passenger lawn mower Plan view of the mower unit Perspective view of the mower unit from the outside front to the rear Side view of the mower unit of the passenger lawn mower Schematic side view showing the horizontal state of the deck when adjusting the height of the mower unit Part 1 Schematic side view showing the horizontal state of the deck when adjusting the height of the mower unit Part 2 Perspective view from above the front of the mower unit Partial enlarged view of the mower unit

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an example of a riding lawn mower according to an embodiment of the present invention. In the following, it will be referred to as front-back, left-right, and up-down based on the traveling direction of the passenger lawn mower.

As shown in FIG. 1, the passenger lawn mower according to the present embodiment includes a mower unit 1 on the lower front side of the traveling vehicle body 2. 3 is the driver's seat, 4 and 5 are the front wheels and the rear wheels, respectively. In addition, a collector 6 for temporarily accommodating the turfgrass cut in the rear is provided. G is the ground. The floor 7, which serves as a foothold for the driver sitting in the driver's seat 3 during driving, is designed to have a height that can secure a space for raising the mower unit 1. Since the rear arm portion 14, which will be described later, is located at the height between the ground G and the floor 7 on both the left and right sides, it is easy to get on and off the floor 7 by using this as a step for getting on and off.

The structure of the mower unit 1 and the like will be described in detail below with reference to FIG.

That is, FIG. 2 is a perspective view of the mower unit 1 in the present embodiment. As shown in FIG. 2, the mower unit 1 includes a deck portion 10, a mowing mechanism 11, front wheel portions 12, 12, front wheel arm portions 13, 13, rear arm portions 14, 14, and elevating arms 15, 15. And prepare.

In the deck portion 10, the cutting blade of the mowing mechanism 11 is housed on the lower side of the top surface, and the power portion of the mowing mechanism 11, the front wheel arm portion 13, the rear arm portion 14, and the elevating arm 15 are housed on the upper side of the top surface. Etc. are arranged in a state of being exposed to the outside.

In the grass cutting mechanism 11, the cutting blade rotates by the power transmitted from the power source supplied from the traveling vehicle body 2 to mow the grass.

The front wheel portion 12 is provided on the front side of the deck portion 10, and the auxiliary wheel 12a comes into contact with the ground G during mowing to support the front wheel arm portion 13. Further, the front wheel portion 12 includes a rotation mechanism 12b in which a rotation shaft along the vertical direction is rotatably provided. The rotation mechanism 12b is connected to the training wheels 12a and rotates in accordance with the traveling of the traveling vehicle body 2 in the traveling direction to direct the training wheels 12a in the traveling direction.

The front wheel arm portion 13 is provided above the deck portion 10, one end on the front side (front end side) is connected to the front wheel portion 12, and the other end on the rear side (rear end side) is connected to the rear arm portion 14. .. Further, the front wheel arm portion 13 is configured to swing with respect to the deck portion 10 by a first connecting fulcrum 18 having a swing axis along the left-right direction of the traveling vehicle body 2.

Specifically, the first connecting fulcrum 18 is arranged closer to the rear between the front wheel portion 12 and the rear arm portion 14.

The rear arm portion 14 is arranged on the rear extension line in the front-rear direction of the front wheel arm portion 13. Specifically, in the rotary connecting portion 19, the front end side of the rear arm portion 13 is connected to the rear end side of the front wheel arm portion 13.

Further, the rear arm portion 14 is swingably connected to the deck portion 10 at the second connecting fulcrum 20 rearward from the front end side. Further, the rear arm portion 14 is connected to the elevating arm 15 so that the rear end side can rotate about the left-right direction as a rotation axis. As a result, the rear arm portion 14 swings in conjunction with the swing of the front wheel arm portion 13. The rear arm portion 14 has a step portion 14s whose upper surface is anti-slip processed so that the driver can easily place his / her foot when getting on and off.

On the other hand, the elevating arm 15 is connected to the traveling vehicle body 2 and moves up and down the deck portion 10 by expanding and contracting the elevating cylinder 26 of the traveling vehicle body 2. Specifically, in the elevating arm 15, the front end portion 22 is rotatably connected to the deck portion 10, and is rotatably connected to the rear arm portion 14 via the horizontal mechanism 21 on the rear side. As a result, the deck portion 10 moves up and down as the raising and lowering arm 15 moves up and down.

Next, the mechanism for changing the cutting height will be described. That is, the front wheel arm portions 13 and 13 are connected to the cutting height cylinder 17 that changes the positional relationship between the lower ends of the front wheel portions 12 and 12 and the lower end of the deck portion 10 via the link mechanisms 16 and 16, respectively. ing. The cutting height cylinder 17 is provided at the front portion of the deck portion 10.

3 to 5 are drawings showing the mower unit 1, FIGS. 3 and 4 are drawings excluding the right cylinder cover 24 on the right side thereof, and FIG. 8 is a drawing showing the right cylinder cover 24 on the right side thereof. It is a figure attached. By the way, 23 is a left cylinder cover located on the left side.

FIG. 3 is a plan view, and FIG. 4 is a perspective view of the outside from the front to the rear. The rotating fulcrum shaft connected to the deck portion 10 of the elevating arm 15 and the rotating fulcrum shaft connected to the deck portion 10 of the cutting height cylinder 17 are on the same connecting shaft 40 and penetrate a single fulcrum pin 41. It is installed by letting it. The first connecting stay 43, which rotatably attaches the front wheel arm portion 13 around the first connecting fulcrum 18, is erected between the cutting height cylinder 17 and the elevating arm 15, and penetrates directly under the first connecting fulcrum 18. The hole 45 is configured (see FIG. 2). The through hole 45 is also on the connecting shaft 40, and the fulcrum pin 41 is inserted therethrough. As a result, of the stopper pins 42 inserted at both ends of the fulcrum pin 41, if the elevating arm 15 side is pulled out and the fulcrum pin 41 is pulled out to the elevating arm 15, the fulcrum pin 41 can be pulled out from the elevating arm 15 without being completely pulled out. The mower unit 1 can be easily attached and detached. Further, since the fulcrum pin 41 is inserted into the through hole 45 of the first connecting stay 43 between the cutting height cylinder 17 and the elevating arm 15, the fulcrum pin 41 can be stably attached and the pulling out work is also stable. Can be done. The above configuration relates to the configuration on the right side of the vehicle, but the left side also has the same configuration, and the deck portion 10 can be removed from the traveling vehicle body by removing the elevating arms 15 on both sides from the deck portion 10.

Here, the link mechanism 16 will be described mainly with reference to FIG. The link mechanism 16 is provided with the same structure on each of the front left and right sides of the deck portion 10, and the first connecting tool 16a, the connecting shaft 16c, the bracket 16b, the first connecting metal fitting 16d, the first connecting bolt 16e, and the first link mechanism 16, respectively. It is composed of two connecting metal fittings 16f, a second connecting metal fitting 16g, and a third connecting metal fitting 16h.

That is, on the cutting height cylinder 17 side, a first connecting tool 16a having a cross section "9" shape (the upper part is a box type and the lower part is a plate portion) is provided. A connecting shaft 16c penetrates the lower plate portion. The connecting shaft 16c is attached to the front portion of the deck portion 10 on the left and right sides, and is shared by the left and right link mechanisms 16 and 16.

The left and right ends of the connecting shaft 16c are rotatably supported by brackets 16b and 16b on the left and right sides of the deck portion 10, respectively.

The first connecting metal fittings 16d are fixed to the positions near both ends of the connecting shaft 16c, respectively. Further, the second connecting metal fitting 16f is rotatably connected to the first connecting metal fitting 16d via the first connecting bolt 16e, and further, the second connecting metal fitting 16f is connected to the second connecting metal fitting 16f via the second connecting bolt 16g. The connecting metal fittings 16h are rotatably connected.

The third connecting metal fitting 16h is fixed to the front wheel arm portion 13. On the other hand, in the first connecting tool 16a, the tip of the rod 17a of the cutting height cylinder 17 is rotatably connected. That is, the tip of the rod 17a is inserted into the box-shaped portion at the upper part of the shape having a cross section of 9, and is rotatably connected to the shaft 16a1 of the box-shaped portion.

Reference numeral 171 is a DC motor for driving the cutting height cylinder 17, and reference numeral 172 is an oil tank.

Here, a mechanism for adjusting the height of the deck portion 10 with respect to the ground G by using the cutting height cylinder 17 will be described.

When the motor 171 is driven by a predetermined amount by the cutting height adjustment switch 27 (see FIG. 1), the rod 17a of the cutting height cylinder 17 expands and contracts to a predetermined position. As a result, the shaft 16a1 of the box-shaped portion connected to the tip of the rod 17a moves, and the first connecting tool 16a rotates to a predetermined position. Since the first connecting tool 16a is fixed to the connecting shaft 16c, the connecting shaft 16c rotates by a predetermined amount. As a result, the first connecting metal fittings 16d fixed to both ends of the connecting shaft 16c rotate. Due to the rotation, the second connecting metal fitting 16f rotates via the first connecting bolt 16e. Due to the rotation, the third connecting metal fitting 16h rotates via the second connecting bolt 16g and moves to a predetermined position. The front wheel arm portion 13 moves due to the rotational movement of the third connecting metal fitting 16h.

For example, when the rod 17a of the cutting height cylinder 17 is extended, the first connector 16a rotates as shown by the arrow A. The connecting shaft 16c fixed by the rotation rotates in the direction of the arrow B. Due to the rotation, the first connecting metal fitting 16 rotates downward, the second connecting metal fitting 16f is pulled down accordingly, and the third connecting metal fitting 16h also moves downward. As a result, the front wheel arm portion 13 moves downward as shown by the arrow C. As a result, the front wheels 12 and 12 also move downward.

Here, the connecting shaft 16c is pivotally supported by the deck portion 10 by the bracket 16b, and the fact that the front wheel 12 moves downward due to the rotation of each of the above members means that the deck portion 10 is based on the front wheel 12 side. It means that the side moves up. That is, assuming that the lower end of the front wheel 12 is in contact with the ground G, the lower end of the deck portion 10 will be in a higher position with respect to the ground G, and the cutting height will be higher.

On the contrary, when the rod 17a of the cutting height cylinder 17 is reduced, the front wheel arm portion 13 moves upward due to the reverse rotation, and takes a low position with respect to the ground G.

FIG. 6 is a schematic side view showing the lower position, and the skeleton of each part thereof is outlined by a thick line. FIG. 7 is a schematic side view showing a case where a high position is taken. As shown in FIGS. 6 and 7, even if the cutting height is changed by the cylinder 17, the elevating arm 15, its front end portion 22, the horizontal mechanism 21, the rear arm portion 14, the second connecting fulcrum 20, and the rotating connecting portion are used. The horizontal state of the deck portion 10 is maintained by the rotation and movement of each member such as 19, the first connecting fulcrum 18, and the front wheel arm portion 13.

That is, the positional relationship between the lower end of the front wheel portion 12 and the lower end of the deck portion 10, specifically, the height of the lower end of the deck portion 10 is unique even when the cutting height is changed and adjusted. It will be decided.

In this way, when the cutting height is adjusted, the rear arm portion 14 rotates around the second connecting fulcrum 20 in conjunction with the operation of the cylinder 17, so that the angle of the place where the driver steps on is the step when getting on and off the driver. It changes and makes you feel uncomfortable. However, in step 14, since the front step portion 14f and the rear step portion 14r are configured at different angles, even if the angle of the rear arm portion 14 changes, at least one of the front step portion 14f or the rear step portion 14r remains. Since the angle is easy to step on, the driver can easily get on and off by stepping on the side that is easy to step on.

Specifically, the rear step portion 14r is configured to be higher from the front to the rear, and when the cutting height is set low as shown in FIG. 6, the rear lowering inclination of the rear arm portion 14 is set. Due to its small size, it can be raised and lowered without discomfort by stepping on either the front step portion 14f or the rear step portion 14r. On the other hand, when the cutting height is set high as shown in FIG. 7, since the rear arm portion 14 has a large rearward downward inclination, the front step portion 14f has an angle that is difficult to step on, but the rear step portion 14r has a large rear step portion 14. The angle is close to horizontal, and you can step on and get on and off the floor 7 without any discomfort.

FIG. 8 is a perspective view of the mower unit 1 as viewed from above the front. In the deck portion 10, the cutting blade of the grass cutting mechanism 11 rotates on the lower side of the top surface, and the grass cut is discharged upward from the discharging portion 31 on the upper surface of the deck portion 10. The discharge portion 31 is connected to the duct 32 by a connection portion 33. Due to the air flow generated by the rotation of the cutting blade of the mowing mechanism 11 and the air flow generated by the blower 35, the mowing discharged from the discharge portion 31 is stored in the collector 6 through the connection portion 33, the duct 32, and the blower 35. (See Figure 1).

FIG. 9 is an enlarged view of a portion of the connection portion 33. Gap 33a and 33b are provided between the discharge portion 31 and the connection portion 33. The gap 33a on the right side of the vehicle and the gap 33b on the left side are provided at similar intervals. Since the pressure sucked by the blower 35 is larger than the pressure sent out by the rotation of the cutting blade, the inside around the connecting portion 33 has a negative pressure. With such a configuration, air is sucked in from the left and right in the same manner, so that the grass can be smoothly conveyed, and an air flow is generated in a well-balanced manner on the left and right, and vibration and noise are reduced.

The present invention is most suitable for a passenger lawn mower.

1 More unit 2 Traveling vehicle body 3 Driver's seat 4, 5 Front wheel, Rear wheel 6 Collector 7 Floor G Ground 10 Deck part 11 Mowing mechanism 12 Front wheel part 13 Front wheel arm part 14 Rear arm part 14s Step part 14f Front step part 14r Rear step Part 15 Lifting arm 16 Link mechanism 17 Cutting height cylinder 18 First connection fulcrum 26 Lifting cylinder 31 Discharge section 32 Duct 33 Connection section 33a Gap (right side)
33b gap (left side)
35 Blower 40 Connecting shaft 41 Supporting pin 42 Stopper pin 43 First connecting stay 45 Through hole

Claims (2)

With the running body
A mower unit provided on the traveling vehicle body is provided.
The mower unit
The deck part where the grass mowing mechanism is installed and the mowing mechanism
A front wheel portion provided in front of the deck portion and grounded during mowing work, and a front wheel portion.
A front wheel arm portion that is connected to the front wheel portion on the front end side and is provided on the deck portion so as to be swingable.
A cutting height cylinder that is connected to the front wheel arm portion via a link mechanism and changes the positional relationship between the lower end of the front wheel portion and the lower end of the deck portion.
Equipped with an elevating cylinder that elevates and elevates the deck portion and an elevating arm that connects the deck portion.
The connecting shaft of the elevating arm and the connecting shaft of the cutting height cylinder are provided on the same shaft.
The cutting height cylinder and the elevating arm are rotatably attached to the deck portion by penetrating one fulcrum pin.
Riding lawn mower. A first connecting stay for rotatably attaching the front wheel arm portion around the first connecting fulcrum is provided between the cutting height cylinder and the elevating arm.
The fulcrum pin is also passed through the first connecting stay.
The passenger lawn mower according to claim 1.

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