JPH1076970A - Sulky lawn mower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate handle operation so as not to cause a hindrance to elevation of a lawn mowing device by putting an output part to output reciprocal motive power in the longitudinal direction of a frame body of a power steering device to a knuckle arm along one side surface of a pair of left and right body frames of a manned mobile frame body. SOLUTION: A second knuckle arm 75 is oscillated and operated around a shaft center in the vertical direction on a frame body of a knuckle shaft 1b as a drag link 76 is driven in the longitudinal direction of the frame body, the knuckle shaft 1b of a left front wheel 1 is revolved against a front wheel support frame 70, this revolutional force is transmitted to a first knuckle arm 73 on the side of a right front wheel through a tie rod 74 from the first knuckle arm 73 on the side of the left front wheel, and the knuckle shaft 1b of the left front wheel 1 is revolved against the front wheel support frame 70 in the opposite direction of the knuckle shaft 1b on the side of the left front wheel. Consequently, the left and right front wheels 1, 1 are steered by a turning angle corresponding to a rotational angle of a steering handle 4 in a direction corresponding to the operating direction of the steering handle 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a riding lawn mower in which a lawn mower is disposed between front and rear wheels of a riding type self-propelled body so as to be able to move up and down freely.

[0002]

2. Description of the Related Art Conventionally, in the above-mentioned lawn mower, wheels are steered by only the rotational operation force of a steering handle.

[0003]

Conventionally, the steering operation for steering the aircraft has been heavy. In particular,
The work location was inclined in the lateral direction of the aircraft, which was noticeable when turning the steering wheel uphill. An object of the first invention is to provide a riding lawn mower in which a steering wheel operation can be lightened without hindering raising and lowering of the lawn mowing device.
An object of the second invention is to provide a riding lawn mower which can be operated with a light handle and has relatively simple structure and excellent durability.

[0004]

The constitution, operation and effect of the invention according to claim 1 are as follows.

[Structure] In a riding lawn mower in which a lawn mowing device is arranged between the front and rear wheels of the riding type self-propelled body so as to be able to freely move up and down, a power operated by a steering handle to steer a body steering wheel. With the steering device, an output unit for outputting the reciprocating power of the power steering device in the longitudinal direction of the fuselage to the knuckle arm is arranged along one lateral side of a pair of left and right fuselage frames of the riding type self-propelled fuselage. is there.

[Operation] When the steering wheel is operated, the power steering device exerts a steering driving force,
The driving force steers the wheels.

The output section of the power steering apparatus (hereinafter simply referred to as a power steering output section) outputs reciprocating power in the longitudinal direction of the body to the knuckle arm, and is therefore the same as or similar to the body frame of the self-propelled body. Located at a close level. In the case of a lawn mower connected between the front and rear wheels so as to be able to move up and down, an input portion such as an input belt pulley generally protrudes from the upper surface of the cutting blade housing. For this reason, if the power steering output section is located between the left and right body frames, it is necessary to set a lifting limit of the lawn mower so that the input section does not hit the power steering output section even when the lawn mower is raised. There are inconveniences such as a relatively small stroke in which the device can be raised and lowered, and a relatively low ground clearance when the lawn mower is raised to its limit. However, in the case of the first invention, since the power steering output unit is located along the lateral side surface of the body frame, even if the lawn mower is raised, the input unit does not hit the power steering output unit, and the input unit is not operated. The lawn mower can be lifted until it enters between the left and right body frames and the upper surface of the blade housing approaches the lower surface of the body frame. That is, it is possible to raise and lower the lawn mower over a wide adjustment range as much as possible, or to lift the lawn mower from the ground to a strong high position.

[Effect] Due to the operation of the power steering device, it is possible to steer the aircraft in the upward direction in the lateral direction only by operating the steering handle lightly.
The lawn mower can now be easily operated by operating the handle lightly. For that reason, it is possible to increase the height adjustment height of the lawn mower and increase the ground height,
The mowing height of the lawn can be adjusted over a wide range to work advantageously, or the mowing device can be lifted high to make it difficult to hit a raised portion on the ground, thereby making it possible to move and travel advantageously.

The structure, operation and effect of the invention according to claim 2 are as follows.

[Structure] In a riding lawn mower in which a lawn mowing device is arranged between front and rear wheels of a riding type self-propelled body so as to be able to move up and down, power for steering a body steering wheel by operating a steering wheel. An output unit that includes a steering device and outputs reciprocating power of the power steering device in the longitudinal direction of the fuselage to a knuckle arm is disposed immediately above the lawn mowing device.

[Operation] When the steering handle is operated, the power steering device exerts a steering driving force,
The driving force steers the wheels.

The output unit of the power steering device is
Since it outputs reciprocating power in the longitudinal direction of the fuselage to the knuckle arm, it is arranged at the same level as or close to the knuckle arm. For this reason, the power steering output section is located at a relatively low level portion, and if there is no cover that covers the lower side, soil and stones jumping from the ground are likely to adhere or hit. However, in the case of the second invention, since the mowing blade housing of the lawn mowing device is located directly above the lawn mowing device, it covers the lower portion of the power steering output portion, and soil and stones adhere to the power steering output portion, To prevent hits.

[Effect] Due to the operation of the power steering device, it is possible to steer the aircraft in the lateral upward direction only by operating the steering handle lightly.
The lawn mower can now be easily operated by operating the handle lightly. In addition, the power steering device has a simple structure using the cutting blade housing as a cover and has a high durability so that the power steering device is not easily deformed or damaged.

The structure, operation and effect of the invention according to claim 3 are as follows.

[Configuration] In the configuration according to the second aspect of the present invention, the output portion extends along one lateral side of a pair of right and left body frames of the riding type self-propelled body.

[Operation] Even if the lawn mowing device is raised, the input portion does not hit the power steering output portion, the input portion enters between the left and right body frames, and the upper surface of the cutting blade housing is located on the lower surface of the body frame. The lawn mower can be lifted until approaching. That is, it is possible to raise and lower the lawn mower over a wide adjustment range as much as possible, or to lift the lawn mower from the ground to a strong high position.

[Effect] An object which can operate the handle lightly and which can use the cutting blade housing as a cover for preventing deformation and breakage of the power steering device can be advantageously used, for example, by raising the lawn mowing device to make it difficult to hit a raised portion on the ground. It is obtained in a state where it can run.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a pair of left and right freely rotatable front wheels 1, 1 and a pair of left and right drivable rear wheels 2, 2 are self-propelled and located at the front of the fuselage. A mowing device having a driving unit having an engine E and an engine bonnet 3 and a riding type self-propelled body including a riding type driving unit having a steering handle 4 and a driver seat 5 located behind the driving unit. The ride-on lawn mower is constructed such that the lift 50 is equipped with a link mechanism 60 so that it can be moved up and down, and the power is transmitted from the intermediate transmission case 20 located at the rear part of the self-propelled body to the lawn mower 50 by the transmission belt 7. It is composed.

As shown in FIGS. 1 and 2, the engine E
The intermediate transmission case 20 in which the input shaft 21 is connected to the output shaft via the rotary shaft 11 is connected to a pair of left and right body fumes 12, 1 of a self-propelled body near the rear axle case 30 at the body front side.
2 and the two body frames 12, 1
2 is supported by a case mounting member 13 supported by the case mounting member 2. A traveling transmission 40 in which an input belt pulley 41 is linked by a transmission belt 14 to a first output belt pulley 22 that is rotatably provided around an axis in the vertical direction of the body above the body of the intermediate transmission case 20. And the two body frames 12, 1 on the rear side of the body of the rear axle case 30.
2 and connected to and supported by the two body frames 12, 12. The traveling transmission 40 includes:
A variable displacement hydraulic pump (not shown) having an input shaft to which the input belt pulley 41 is integrally rotatably connected;
A hydraulic motor (not shown) driven by the hydraulic pressure from the hydraulic pump is constituted by a hydrostatic continuously variable transmission device which is housed in the same transmission device case. The switching operation can be performed between the forward side and the reverse side, and the speed change operation can be continuously performed on both the forward side and the reverse side. The rear axle case 30 rotatably supports a pair of rear axles 31, 31 respectively having left and right rear wheels 2, 2 rotatably mounted integrally with each other. A rear wheel differential mechanism (not shown) for transmitting rotation output to the left and right rear axles 31, 31 is provided. That is, the rotation output of the engine E is
1 and to the intermediate transmission case 20 and from the intermediate transmission case 20 to the traveling transmission 40 via a belt, and the rotational output of the traveling transmission 40 to the right and left rear axles 31 via a differential mechanism. The transmission is performed to drive the left and right rear wheels 2 and 2. As a result, by switching the traveling transmission 40 to the forward side and performing a speed change operation, the left and right rear wheels 2, 2 can be driven to the forward side and the driving speed can be changed. By switching the traveling transmission 40 to the reverse side and performing a speed change operation, the left and right rear wheels 2 can be driven to the reverse side and the driving speed can be changed, so that the aircraft travels backward and performs variable speed traveling. By operating the traveling transmission 40 neutrally,
The driving of the left and right rear wheels 2 can be stopped, and the vehicle travel stops.
The rotary shaft 11 includes a universal joint portion connected to the output shaft of the engine E, and a universal joint portion 11a connected to the input shaft 21 of the intermediate transmission case 20.
The traveling transmission 40 includes a cooling fan 42 for cooling the transmission. The cooling fan 42 is rotatably mounted integrally with the input shaft to which the input belt pulley 41 is connected, and receives power from the intermediate transmission case 20 even when the traveling transmission 40 is operated in a neutral state. As long as it rotates, it performs a cooling action. The tension pulley 15 shown in FIG. 2 is a pulley that applies a transmission tension to the transmission belt 14.

As shown in FIGS. 1 and 2, the lawn mowing apparatus 50 includes three rotating cutting blades 51 arranged in a cutting blade housing 52 in a lateral direction of a machine and rotatable about a vertical axis of the machine body. The cutting blade housing 52 is supported by a pair of front and rear swing links 61 and 62 of the link mechanism 60 so that the cutting blade housing 52 can be moved up and down. Along with the running of the machine body, a cutting blade drive mechanism 53 provided on the upper surface side of the cutting blade housing 52 drives the three rotary cutting blades 51 by the rotating power from the intermediate transmission case 20, and the cutting blade housing 52 The gauge wheels 54 rotatably mounted on the right and left sides of the rear part around the axis in the lateral direction of the machine body roll on the grass surface, and the height of each rotary cutting blade 51 from the grass surface is measured by the gauge wheels 54. It is configured to maintain at a set height determined by the mounting height with respect to the cutting blade housing 52. As a result, the lawn mowing device 50 mows the lawn at the mowing height set by the gauge wheel 54 with the three rotating blades 51. As shown in FIG. 2, rollers 55 rotatably supported around the axis in the lateral direction of the machine at three positions arranged in the lateral direction of the machine on the front end side of the cutting blade housing 52, and a raised portion of the ground is provided at a place where lawn mowing is to be performed. If an obstacle such as exists, it will overcome it.

As shown in FIG. 2, the cutting blade drive mechanism 53
Of the three rotary cutting blades 51. A rotary shaft supporting the rotary cutting blade 51 positioned at the center in the lateral direction of the machine body integrally rotates with a shaft portion protruding from the upper surface side of the cutting blade housing 52. One input belt pulley 5 which is freely mounted and has upper and lower two-stage belt hanging grooves 56a, 56b.
6, a cutting blade drive pulley 57 that is rotatably attached to a shaft portion of each of the other two rotating cutting blades 51, 51, which protrudes on the upper surface side of the cutting blade housing 52, and a cutting blade drive pulley. 57, a guide pulley 58 located near the input belt pulley 56, and a lower belt hooking groove 56b of two upper and lower belt hooking grooves 56a and 56b of the input belt pulley 56. Each of the transmission belts 59 is constituted. Of the two upper and lower belt hooking grooves 56a and 56b of the input belt pulley 56, the upper belt hooking groove 5
The transmission belt 7 is wrapped around 6a and a second output belt pulley 23 which is rotatably provided on the lower side of the intermediate transmission case 20 around the vertical axis of the aircraft as shown in FIG. . That is, the cutting blade drive mechanism 53
Is input to the input belt pulley 56 from the intermediate transmission case 20 and rotates the input belt pulley 56 in each rotation while the input belt pulley 56 is also used as a pulley for driving the central rotary cutting blade 51. Drive pulley 5 of cutting blade 51
6 and 57 to drive each rotary cutting blade 51.

As shown in FIG. 4, a vertical knuckle shaft 1b extending from an end of an axle 1a for rotatably supporting the left front wheel 1 is rotatably mounted on one end of a front wheel support frame 70. A vertical knuckle shaft 1b extending from an end of an axle 1a for supporting and supporting the right front wheel 1 rotatably is rotatably supported on the other end side of the front wheel support frame 70. The front wheel supporting frame 70 is a pair of front and rear brackets 71, 71 and both brackets 71, 71 attached to the front end side of the pair of left and right body frames 12, 12 at an intermediate portion of the frame 70 in the body lateral direction. Are swingably supported by the fuselage frame 12 via a pivot shaft 72 in the longitudinal direction of the fuselage. A first knuckle arm 73 integrally rotatably connected to the lower end of the knuckle shaft 1b of the left front wheel 1;
And a first knuckle arm 73 connected to the lower end of the knuckle shaft 1b so as to be rotatable integrally with the knuckle shaft 1b by a tie rod 74 so as to swing in the same direction. A second knuckle arm 7 is provided on the upper end side of the knuckle shaft 1b of the left front wheel 1.
5 so that the second knuckle arm 7
5 is connected to an output shaft 77 a via a drag link 76 so that the lower portion of the gear mechanism 77 is covered by the cutting blade housing 52, and the gear mechanism 7 is
7 is located just above the lawn mower 50 so as not to be an obstacle to the rise of the input belt pulley 56, and the left body frame 12 of the pair of body frames 12,
And is supported by the body frame 12 via a bracket 78 configured to bolt the gear mechanism 77 to the outside of the body along the lateral side surface 12a.
As shown in FIG. 3, an input shaft 77 b facing obliquely upward and inside the body of the gear mechanism 77 is connected to a lower end of a rotation support shaft 80 of the steering handle 4 via a rotation shaft 79. A power steering device main body 81 having an electric power motor M is attached to the rotation support shaft 80, and a power steering device 82 is constituted by the power steering device main body 81 and the gear mechanism 77. The steering operation of the left and right front wheels 1 and 1 can be performed, and the steering wheel operation can be reduced.

That is, when the steering handle 4 is rotated, the rotation support shaft 80 rotates together with the steering handle 4, and the rotation force is transmitted to the input shaft 77 b of the gear mechanism 77 via the rotation shaft 79. Then, the gear mechanism 7
7, a pinion gear 77c that rotates integrally with the input shaft 77b as shown in FIG. The rotational force of the motor 77b is converted into linear power in the longitudinal direction of the fuselage by the pinion gear 77c and the rack gear 77d, and the linear power is output to the drag link 76 from the output shaft 77a. Then, the drag link 76 is driven in the front-rear direction of the fuselage to swing the second knuckle arm 75 around the vertical axis of the knuckle shaft 1b in the vertical direction of the fuselage, and the knuckle shaft 1b of the left front wheel 1 is moved relative to the front wheel support frame 70. And the turning force is applied to the first knuckle arm 73 on the left front wheel side.
The knuckle shaft 1b of the right front wheel 1 is transmitted to the front knuckle shaft 1b of the right front wheel 1 in a direction opposite to the knuckle shaft 1b of the left front wheel side via a tie rod 74.
To rotate. Thus, the left and right front wheels 1 and 1 are steered in a direction corresponding to the operation direction of the steering handle 4 by an angle corresponding to the rotation angle of the steering handle 4.

The main body 81 of the power steering apparatus comprises a sensor 81a and a shaft driving gear 81b attached to the rotating shaft 80, and an output gear 8 meshing with the shaft driving gear 81b.
1c, and a control mechanism 81d linking the electric power motor M and the sensor 81a. When the steering handle 4 is rotated, the sensor 81a detects the rotation direction and the rotation torque of the rotation support shaft 80 that is rotated by the steering handle 4. Then, the control mechanism 81d automatically drives the power motor M in the rotation direction corresponding to the rotation direction of the rotation support shaft 80 based on the information from the sensor 81a, and the power motor M drives the support shaft drive gear 81b. , A rotational power is applied to the rotating shaft 80. Then, the rotating power of the rotation support shaft 80 by the power motor M is transmitted through the rotation shaft 79 to the input shaft 77 of the gear mechanism 77.
b, and the gear mechanism 77 is moved to the input shaft 77b as described above.
Is converted into a linear power in the longitudinal direction of the aircraft, and the output shaft 7
7a to the Draklink 76. When the rotation operation of the steering handle 4 is stopped, the rotation support shaft 8 is stopped.
0 is stopped and the sensor 81a detects the stop of the spindle, and the control mechanism 81d automatically stops the power motor M based on the information from the sensor 81a. Is stopped, and the gear mechanism 77 stops outputting to the drag link 76. Thus, when the steering wheel 4 is rotated, the power steering device 82 is operated so as to be operated by the steering handle 4. And the gear mechanism 77 is converted and output at this point to convert the turning power by the power motor M into the reciprocating power in the vehicle longitudinal direction together with the turning force by the steering handle 4 at this point. The driving force is output to the second knuckle arm 75, and the steering force of the left and right front wheels 1, 1 is performed by adding the driving force of the power motor M to the manual steering operation force of the steering handle 4.

[Other Embodiment] FIG. 5 shows a traveling device of a self-propelled body provided with another embodiment, which is constituted by a four-wheel steering so that both the front wheel 1 and the rear wheel 2 can be steered. That is, the left and right front wheels 1, 1 are attached to the body frame 12 by the same structure as the front wheel attachment structure in FIG.
The steering operation around the axis of the knuckle shaft 1b can be performed. A wheel-side case portion 30a of the rear axle case 30 that supports the rear wheel 2 is attached to the body-side case portion 30b that is connected to the body frame 12 in the vertical axis P of the body.
The rear wheel 2 can be steered with respect to the fuselage by being supported so as to be swingable around one. Left front wheel 1
A gear mechanism 77 in which a front wheel output shaft 77a is connected via a drag link 76 to a second knuckle arm 75 integrally rotatably connected to the knuckle shaft 1b of the lawn mower 5
0, and is supported along the lateral side surface 12a on the outside of the body of the left body frame 12 of the pair of left and right body frames 12, 12. A knuckle arm 83 is provided on the wheel side case portion 30a of the left rear wheel 2 so as to be swingable integrally.
The swing link 85 interlocked with the frame 4 is attached to the bracket 86 supported by the body frame 12 by the vertical axis P of the body.
The gear mechanism 77 is provided with a rear wheel output shaft 77f that is rotatably supported around the shaft 2 and is connected to the swing link 85 via a drag link 87. The input shaft 77b of the gear mechanism 77 is connected to the steering handle 4, similarly to the gear mechanism 77 shown in FIG.
The gear mechanism 77 includes a pinion gear 77c integrally rotatably connected to the input shaft 77b,
and a rack gear that meshes with the front wheel output shaft 77a at the front end and the rear wheel output shaft 77f at the rear end.

That is, when the steering handle 4 is rotated, the rotational force of the rotating shaft 80 that rotates together with the steering handle 4 and the rotational force applied to the rotating shaft 80 by the electric power motor M of the steering device body 81 are shifted by gears. The power is transmitted to the input shaft 77b of the mechanism 77. Gear mechanism 7
7 converts the rotational force of the input shaft 77b into reciprocating power in the longitudinal direction of the fuselage, from the front wheel output shaft 77a to the front wheel side drag link 76, and from the rear wheel output shaft 77f to the rear wheel side drag link 87, respectively. Output. Then, the front wheel-side drag link 76 is driven in the longitudinal direction of the fuselage to swing the second knuckle arm 75, so that both the operating force of the steering handle 4 by the driver and the operating force of the power motor M are used. Thus, the left and right front wheels 1, 1 can be steered.
Then, the rear wheel side drag link 87 is driven in the same direction as the front wheel side drag link 76 in the longitudinal direction of the fuselage, so that the knuckle arm 8 is driven through the swing link 85 and the interlocking link 84.
The left and right rear wheels 2 and 2 are steered in the opposite direction to the swing direction of the front wheel 1 by both the operating force of the steering wheel 4 by the driver and the operating force of the power motor M in order to swing the wheel 3. Can be operated. The turning angles of the left and right rear wheels 2 are smaller than the turning angles of the left and right front wheels 1 and 1 due to the link ratio of the swing link 85 and the like.

FIG. 6 shows a power transmission structure according to another embodiment, in which the engine E is a vertical axis type engine whose output shaft 10 is oriented in the vertical direction of the body. Output shaft 10 of engine E
A transmission belt 91 is wound around an upper output belt pulley 90a of a pair of upper and lower output belt pulleys 90a and 90b provided on the input belt pulley 41 of the traveling transmission 40 similar to the traveling transmission 40, By applying a transmission tension to the transmission belt 91 by the tension pulley 92, power is transmitted from the engine E to the traveling transmission 40, and the application of the transmission tension to the transmission belt 91 by the tension pulley 92 is released. Thus, the transmission of power from the engine E to the transmission 40 is cut off. A transmission belt 95 is wound around the lower output belt pulley 90b of the pair of output belt pulleys 90a and 90b and the input belt pulley 94 of the intermediate transmission shaft 93 located near the front side of the rear axle case 30 in the body. , The intermediate transmission shaft 93
The transmission belt 7 is wound around an output belt pulley 96 of the lawn mower 50 and an input belt pulley 56 similar to the input belt pulley 56 of the lawn mower 50. The transmission belt 95
The transmission tension is applied by the tension pulley 97 to the mower, the power is transmitted from the engine E to the lawn mowing device 50, and the application of the transmission tension to the transmission belt 95 by the tension pulley 97 is released. The power transmission to the device 50 is cut off. A belt pulley 43 provided on the traveling transmission 40 so as to be rotatable integrally with the input belt pulley 41.
Is for taking out power for transmitting power to the attachment when the attachment is connected to the self-propelled body.

In practicing the first aspect of the present invention, the gear mechanism 77 is arranged along the lateral side surface 12a of the body frame 12 outside the fuselage as in the above-described embodiment, and the lateral side surface of the body frame 12 inside the fuselage. May be implemented along the line. Also in this case, since the gear mechanism 77 is located on the side of the lawn mower 50 directly above the input belt pulley 56, the gear mechanism 77 can be prevented from becoming an obstacle to the rise of the input belt pulley 56 when the lawn mower 50 is lifted. is there.

Power steering output changing means for adjusting the power supplied to the electric power motor M to change the driving force applied to the rotating shaft 80 by the power motor M, a manual operation switch for operating the power steering output changing means, a steering wheel Control means for detecting the rotation angle of the steering wheel 4 and automatically operating the power steering output changing means on the basis of the detection result; detecting the rotation speed of the engine E and automatically operating the power steering output changing means on the basis of the detection result; May be provided with a control means for performing the operation. Then, the steering wheel 4 becomes heavier and harder to meander during straight running, and the steering wheel 4 becomes lighter during turning running, so that it is possible to run advantageously so that steering operation can be performed easily. Further, it is possible to automatically change the force required for operating the steering wheel so that the steering wheel becomes lighter as the steering angle of the steering wheel increases. Further, the steering wheel 4 can be adjusted lightly or heavily according to the type of work and the driver's preference, which is convenient. Further, when the steering operation force is automatically applied to the power steering device 82 according to the rotation speed of the engine E or artificially as necessary, the turning on and off of the application of the steering operation force is performed. Can be used by switching.

Instead of the power steering device 82,
The present invention is also applicable to a case where a hydraulic booster type power steering device is employed. Therefore, these electric and hydraulic power steering devices are collectively referred to simply as a power steering device 82, and the gear mechanism 77
Is referred to as an output unit 77.

[Brief description of the drawings]

FIG. 1 is a side view of the entire riding lawn mower.

FIG. 2 is a plan view of a transmission structure for a rear wheel and a lawn mower.

FIG. 3 is a side view of the power steering device.

FIG. 4 is a plan view of an output unit of the power steering device.

FIG. 5 is a plan view of a traveling device according to another embodiment.

FIG. 6 is a schematic view of a transmission structure for a rear wheel and a lawn mower according to another embodiment.

[Explanation of symbols]

 1, 2 Aircraft steering wheel 50 Lawn mower 75, 83 Knuckle arm 77 Output unit 82 Power steering device

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazuaki Kurohara 64 Ishizukita-cho, Sakai City, Osaka Prefecture Inside the Kubota Sakai Works (72) Inventor Nobuyuki Yamashita 64 Ishizukita-cho, Sakai City, Osaka Prefecture Kubota Sakai Co., Ltd. Inside the factory (72) Inventor Masaki Hayashi 64, Ishizukitamachi, Sakai City, Osaka Prefecture Inside the Kubota Sakai Factory (72) Inventor Seiya Harada 64, Ishizukitamachi, Sakai City, Osaka Prefecture Inside Kubota Sakai Factory

Claims (3)

[Claims] 1. A riding lawn mower in which a lawn mower is disposed between front and rear wheels of a riding type self-propelled body so as to be able to move up and down, and is operated by a steering handle to steer a body steering wheel. A power steering device is provided, and an output unit for outputting reciprocating power in the longitudinal direction of the body of the power steering device to a knuckle arm is arranged along one lateral side of a pair of right and left body frames of the riding type self-propelled body. Riding-type lawn mower. 2. A riding lawn mower in which a lawn mowing device is arranged between front and rear wheels of a riding type self-propelled body so as to be able to move up and down, and is operated by a steering handle to steer a body steering wheel. A riding lawn mower comprising a power steering device, and an output portion for outputting reciprocating power in a longitudinal direction of the body of the power steering device to a knuckle arm, which is disposed immediately above the lawn mower. 3. The riding lawn mower according to claim 2, wherein the output portion is arranged along one lateral side of a pair of left and right body frames of the riding type self-propelled body.