JP2000211384A - Operation wheel of running vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make operation easier with reduced resistance during manual operation by supporting the operation wheel freely rotatably while making them freely turnable to the right and left within a predetermined angle, and to improve operability by reducing the reaction force generated when the operation wheels are turned due to bumps while running on a bumpy road. SOLUTION: Drive wheels on the left and right sides are made rotatable in forward and reverse directions independently. Further, this vehicle is provided with driven wheels 16 of caster type rotatably supported either in front of or in back of drive wheels 43. A support rod which supports the driven wheels is supported by a caster guide 100. The support rod is installed such that it is freely rotatable in to the left and right within a predetermined relative angle with respect to the caster guide. The caster guide and a speed control member of the drive wheels are cooperatively linked to a steering operation device 14. An indicator 11 for indicating a traveling direction is disposed between linking members that connect the caster guide and the steering operation device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a drive wheel capable of independently driving forward and reverse rotation to the left and right, and a caster wheel rotatably and freely rotatable in the left and right direction before or after the drive wheel. The present invention relates to a technique for preventing a temporary increase in running resistance that occurs when switching between forward and backward traveling in a running vehicle.

[0002]

2. Description of the Related Art Conventionally, it is known that there is known a traveling vehicle in which one of a front wheel and a rear wheel is a drive wheel, the other is a caster wheel, and the drive wheels are capable of changing the forward / reverse rotation and the rotation speed independently of right and left. Has become. A driving unit for driving the driving wheels includes a hydrostatic transmission (hereinafter, “HS”) including a pair of hydraulic pumps and a hydraulic motor.
T ”. ), Hydraulic motors are mounted on the left and right drive wheels, respectively, to separately change the output rotation of the left and right hydraulic motors, or one of a pair of HSTs for steering and the other for traveling. According to the conventional technology, a difference is made between the rotational speeds of the left and right traveling drive wheels by means of a hydrostatic pump / motor for steering according to the turning direction of the steering operation tool, thereby enabling the turning operation. The caster wheels are mounted so as to be swivelable 360 degrees in the left and right direction, are independent of the steering operation tool and are independent, and can be easily and quickly turned in the turning direction to improve the feeling during steering operation. I was planning to do it. This technology has been applied to tractors, mowers and the like.

[0003]

However, in the conventional traveling vehicle as described above, since the caster wheels can be turned in all directions of 360 degrees, when the traveling direction of the vehicle is largely changed, the wheels of the caster wheels are turned. In order to follow the direction, it is necessary to largely change the direction. In particular, when the vehicle is stopped and the traveling direction is changed by nearly 180 degrees and the traveling is started again, for example, when switching from forward traveling to reverse traveling or switching from turning left to turning right,
The wheels will need to change direction by nearly 180 degrees to follow the new direction of travel.

Further, the direction of the caster wheels is mechanically independent of the steering operating tool as described above, and changes the direction following the running direction when the vehicle is steered and running. Only. As described above, since the direction of the caster wheels does not directly follow the operation of the steering operating tool, the direction of the caster wheels can follow the turning direction of the steering operating tool when the vehicle is stopped. Instead, the direction change of the caster wheels is performed after the running is started again and the caster wheels start rotating. For this reason, the caster wheel
For a moment after the vehicle starts, the vehicle moves so as to draw a slightly “S” -shaped trajectory with respect to the ground.

[0005] For example, if the vehicle is stopped and the steering wheel is turned to the right when the vehicle is stopped and the caster wheels are turned to the left, the airframe is turned to the left while the caster wheels are turned to the left. The wheel turns to the right, which is the opposite direction, so that the caster wheel turns significantly from left to right for a moment immediately after the start to follow the turning direction. As a result, the caster wheel exhibits the above behavior for a moment.

When the traveling vehicle is traveling forward, the casters are facing forward. However, when the traveling direction is switched backward by a lever or the like after the vehicle stops and the traveling vehicle is started again, the caster wheels move forward. The caster wheel turns backward by approximately 180 degrees from the front to the rear at the moment of the start just after the start in order to follow the running direction. Even in this case, the caster wheel exhibits the above behavior.

[0007] The S-shaped behavior of the caster wheels causes the body to swing substantially at right angles to the traveling (turning) direction, which confuses the operator. In addition, the caster wheel may be perpendicular to the traveling direction for a moment due to the behavior of the caster wheel, and the traveling resistance increases for a moment and the steering HST becomes insufficient in capacity, causing a stall.
Further, at that moment, the caster wheel cannot rotate and is dragged in the traveling direction of the vehicle, thereby damaging the ground contact surface.

Further, as described above, the steering operating tool and the caster wheels are mechanically independent, and the caster wheels are usually located below the steps, and are difficult for the operator to see because of the steps and the like. Therefore, the operator cannot perform the steering operation while checking in which direction the caster wheel is rotated,
The operator performed the steering operation while feeling slightly uneasy.

[0009]

The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described. According to the first aspect of the present invention, the operation wheels that are steered and rotated left and right by a manual operation are rotatably supported and can be turned left and right within a set angle. According to a second aspect of the present invention, in a traveling vehicle in which left and right driving wheels are driven by a traveling drive HST and the driving wheels can be steered by a steering HST, a support rod for mounting and supporting a rotatable operation wheel is caster. The caster guide was supported by a guide, and the support rod was attached to the caster guide so as to be rotatable left and right within a set angle. According to a third aspect of the present invention, an indicator indicating a traveling direction is arranged between members for connecting the caster guide and a steering operation tool.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment in which the present invention shown in the attached drawings is applied to a mower will be described. FIG. 1 is a side view showing an overall configuration of an embodiment in which the present invention is applied to a lawn mower, FIG. 2 is a plan view of a steering drive device provided in the lawn mower, FIG. Is a plan sectional view of the same, and FIG. 5 is a skeleton diagram of the steering drive system.

Referring to FIG. 1, the entire configuration of an embodiment in which the present invention is applied to a lawn mower will be described. That is, the lawn mower 1 has a front column 13 on the front of the vehicle chassis 12.
And a steering handle 14 as a steering operation tool protrudes from the front column 13. A speed change pedal 15 as a speed change operation tool and a brake pedal (not shown) are arranged on a side portion of the front column 13. Rear wheels 43 serving as running drive wheels are supported on the left and right sides of the rear portion of the vehicle chassis 12, and front wheels 16 serving as operating wheels are disposed on the left and right sides of the lower front. Although the left and right front wheels 16 are arranged at two places in this embodiment, one front wheel 16 may be arranged, or three or more wheels may be arranged. In addition, the traveling drive wheels 43 and the operating wheels 1
The so-called front-wheel drive can be realized by reversing the front and rear arrangement of 6.16. Also, the steering handle 14
Is a wheel type, but may be a bar type.

A seat 17 is mounted on the center of the vehicle chassis 12, and a mower 9 is arranged below the mower 9. The mower 9 is provided with a rotary blade in a case 19, and is provided with a pulley, a belt and the like from an engine 11, which will be described later. It is configured to be driven via a.
Further, the mower 9 can be moved up and down on the front part and the rear part of the case 19 by being connected to link mechanisms for elevating and lowering, respectively.
An engine 11 is mounted on a rear portion of the vehicle chassis 12 and covered with a bonnet. The engine 11 is a vertical type, and an output shaft 11a projects vertically downward, and an output pulley 20 is fixed to a lower end of the output shaft 11a. Has been established.

A steering drive device 2 according to the present invention is disposed at a lower rear portion of the vehicle chassis 12. As shown in FIGS. 2, 3, and 4, the steering drive device 2 includes a traveling drive HST21 including a hydraulic pump and a hydraulic motor and a steering HST22 in a single housing 23.
, A differential device including a differential gear device, and a pair of left and right axles 40L and 40R are housed. However, traveling drive HS
The position of T21 and the steering HST22 for steering may be reversed.

A first input shaft 25 and a second input shaft 26 serving as pump shafts of the traveling drive HST 21 and the steering HST 22 respectively protrude above the housing 23. A first input pulley 27, a second input pulley 28, and fans 39, 39 are fixedly mounted thereon, and the output pulley 20 and a tension pulley 29 are disposed between the first input pulley 27 and the second input pulley 28. , The first input pulley 27
The belt 30 is wound between the second input pulley 28, the output pulley 20, and the tension pulley 29, so that power can be transmitted from the engine 11.

A pulley 3 is further provided on the first input shaft 25.
As shown in FIG. 1, a support pipe 32 is erected at an intermediate portion of the vehicle chassis 12 in the front-rear direction, and a counter shaft 33 is rotatably supported on the support pipe 32 so as to be rotatable. Pulleys 34 at the top and bottom of 33 respectively
35 is fixedly mounted, the pulley 34 and the pulley 31
The belt 37 is wound between the pulley 35 and the pulley 38 fixed on the input shaft of the mower 9 to drive the mower 9. However, a tension pulley may be provided between the pulley 35 and the pulley 38 to provide a belt tension clutch so that the driving force of the mower 9 can be connected and disconnected.

Next, the structure inside the housing 23 will be described with reference to FIGS. 3, 4, and 5. FIG. The traveling drive HST21, the steering HST22, the traveling differential 6, the steering differential 7, the axles 40L and 40R, and the power transmission gear mechanism are housed in a housing 23 configured to be vertically splittable. Since the configuration of the traveling drive HST21 and the steering HST22 are substantially the same, the configuration of the traveling drive HST21 will be described here. The traveling drive HST 21 arranges a hydraulic pump 52 on a horizontal portion of an L-shaped center section 51 having a horizontal portion and a vertical portion, and arranges a hydraulic motor 53 on the vertical portion. A hydraulic motor 53 is disposed on the side, and the hydraulic pump 52 and the hydraulic motor 53 are fluidly connected by a closed circuit formed in the center section 51.

The housing 23 is formed by joining each other on a peripheral flat joining surface in a horizontal plane, and a bearing portion for the motor shaft 54 and the counter shaft 55 is provided on the joining surface of the housing 23. Axle 40L ・ 40
The bearing portion of R is displaced upward from the joint surface and rotatably supported. Each of the axles 40L and 40R is differentially coupled by a differential gear device 56, and both ends protrude to the left and right outside of the housing.

The hydraulic pump 52 has a center section 5
A first input shaft 25 serving as the pump shaft is vertically supported at the center of the first input shaft 25 on a horizontal plane, and a cylinder block is fitted to the first input shaft 25 so that a pump mounting surface is formed. A plurality of pistons are reciprocally fitted in the cylinder block via an urging spring, and a movable swash plate 57 is in contact with the head of the piston. . By tilting the movable swash plate 57 as a speed adjusting member, the amount and direction of oil discharge from the hydraulic pump 52 can be changed.

In order to tilt the movable swash plate 57,
A control shaft 59 is axially supported on the side wall of the housing 23 in parallel with the axle 40 (FIG. 2). A neutral return spring is fitted inside the housing of the control shaft 59 so that the movable swash plate 5
7 is biased to the neutral position so that the neutral position can be adjusted. A control arm 60 is fixed on a control shaft 59 outside the housing 23, and a speed change operation tool such as a lever or a pedal is provided via a link mechanism described later.
In this embodiment, it is connected to the speed change pedal 15. The speed change pedal 15 pivotally supports an intermediate portion and has two front and rear tread portions. When the front side is depressed, the transmission pedal 15 is driven forward, and when the rear side is depressed, it is driven rearward. I am able to do it quickly.

With this configuration, when the shift pedal 15 is rotated, the control arm 6 is rotated.
0 is rotated in the longitudinal direction of the aircraft, and the control shaft 5
The rotation of the movable swash plate 57 is tilted by the rotation of the cylinder 9 so that the discharge direction and discharge amount of the hydraulic oil from the hydraulic pump 52 can be changed.

Pressure oil from the hydraulic pump 52 is sent to a hydraulic motor 53 via an oil passage in the center section 51. The structure of the hydraulic motor 53 is the center section 5
A motor-attached surface is formed on the vertical surface of the motor 1. The cylinder block 63 is rotatably supported on the motor-attached surface. A plurality of pistons 64 are reciprocally fitted in a plurality of cylinder holes of the cylinder block 63 via biasing springs. The head of the piston 64 is in contact with the fixed swash plate 65. A hydraulic motor 53 is configured by integrally and horizontally disposing a motor shaft 54 on the rotation axis of the cylinder block 63 so as not to rotate relatively.

A brake device 66 is provided on the motor shaft 54.
A gear 67 is fixed to the end of the motor shaft 54, and the gear 67 meshes with a large-diameter gear 68 fixed on the counter shaft 55. Further, a small-diameter gear 69 fixed on the counter shaft 55 meshes with a ring gear 70 of the differential gear device 56, and is decelerated from the motor shaft 54 by the ring gear 70 to form a traveling differential device 6 composed of a differential gear device.
Is driven to transmit power to the left and right axles 40L and 40R.

The steering HST 22 has substantially the same configuration as that of the traveling drive HST 21, is disposed substantially symmetrically in the front-rear direction, and includes a hydraulic pump 71 and a hydraulic motor 72. A control shaft 73 for rotating the movable swash plate 76 of the hydraulic pump 71 protrudes to the right of the housing 23, and is connected to a control arm 74 fixed on the control shaft 73 outside the housing via a link mechanism described later. The movable swash plate 76 is rotated by the rotation of the steering handle 14.

A brake device 78 is disposed at the end of the motor shaft 77 of the hydraulic motor 72 so that the arm 79 can be rotated to apply a brake. Also,
A gear 80 is fixed on the motor shaft 77,
Is meshed with a gear 82 on a counter shaft 81, and a gear 83 fixed on the counter shaft 81 is meshed with a ring gear 84 of the steering differential 7 composed of a differential gear device. The differential output shaft 41L of the steering differential 7
Output gears 90L and 90R are fixed on both sides of the 41R, and a gear 92L fixed on the axle 40L via a counter gear 91 to a gear on one side (the left side in this embodiment) of the output gears 90L and 90R. The other gear 90R meshes with a gear 92R fixed on the axle 40R.

In such a configuration, the traveling drive HST2
The driving force from the first hydraulic motor 53 is gears 67, 68.6.
The speed is reduced to 9 and transmitted to the ring gear 70 of the traveling differential 6 to drive the axles 40L and 40R. When the hydraulic motor 72 of the steering HST 22 is operated, the driving force is reduced to the gears 80, 82, 83, and transmitted to the ring gear 84 of the steering differential 7, so that the differential output shaft 4
Power is transmitted to 1L / 41R, but in order to transmit rotational forces in opposite directions to gears 92L / 92R fixed on axles 40L / 40R, one side is in the deceleration direction and the other side is in the acceleration direction. By transmitting the torque, the left and right operating wheels (rear wheels 43
43), a rotation difference is generated, and the aircraft can be turned.

It should be noted that instead of using the two differential gear type differentials as described above, the steering can be similarly driven by using a planetary gear and a bevel gear. That is, as shown in FIG. 13, an axle 40L is attached to a small-diameter gear 69 that transmits the power by reducing the output rotation of the hydraulic motor 53.
· Meshes with a center gear 94 fixed on a shaft 93 disposed on the same axis as the 40R; sun gears 95 are fixed on both sides of the shaft 93; and planetary gears are provided on the outer periphery of the sun gears 95. Are engaged with each other, and the planetary gears 96 are supported by carriers 97. The carriers 97 are fixed to the inner ends of the axles 40L and 40R. . The outsides of the planetary gears 96 are further meshed with internal gears 98.
Are fixed integrally with the gears 99, 99 loosely fitted on the axles 40L, 40R.

On the other hand, power is transmitted to a bevel gear 130 via a forward / reverse switching device 89 to a motor shaft 77 of the hydraulic motor 72, and bevel gears 132, 132 fixedly mounted on support shafts 131, 131 to the bevel gear 130 on both sides. Gears 133 are fixed to the outside of the support shafts 131, and the gears 133 are meshed with the gears 99. With such a configuration, when the output rotation from the hydraulic motor 72 is transmitted from the bevel gear 130 to the bevel gears 132, 132, the output rotation is rotated in opposite directions to each other. The deceleration rotation is transmitted to the other side, and the vehicle can turn.

Next, the support structure for the front wheels 16 attached to the traveling vehicle having the above-described drive structure will be described in detail. FIG. 6 is a side view showing a support structure of a front wheel provided in the lawn mower, FIG. 7 is a front view thereof, and FIG. 8 is a plan view thereof. FIG. 9 is a view taken along the line XX in FIG. 7, and FIG. 10 is a view showing a state in which the axle support has rotated from the state of FIG. . FIG. 11 is a plan view showing a relative rotatable range of the operation wheels with respect to the caster guide. Also,
FIG. 12 is a schematic diagram of the loan mower.

The supporting structure of the left and right front wheels 16 is exactly the same, and as shown in FIGS. 1 and 6, a boss 12a formed on the front left and right of the vehicle chassis 12 has a pivot shaft of the caster guide 100. 101 is supported in the vertical direction so as to be rotatable left and right. The caster guide is the rotating shaft 1
01, a rotation restricting body 102 is fixedly provided, and a pipe-shaped rotation shaft support 103 is further provided.
In 03, a support rod 105 of an axle support 104 is pivotally supported in the vertical direction so as to be rotatable left and right.

The axle support 104 is connected to the support rod 105.
The support member 106 is bent so as to cover the upper side and one side of the operation wheel 16 and extends downward, and the axle 107 protrudes below the lower portion thereof. We have and support. The operation wheel 16 is rotatably supported on the axle 107.

The rotation restricting body 102 of the caster guide 100 has a configuration in which the axle support member 106 side is extended downward as shown in FIG. 7, and has two front and rear portions at its lower end as shown in FIGS. The restricting projections 108 project downward. The regulating projections 108 are shown in FIG.
, The support member 106 of the axle support 104 in a front view.
And are arranged to overlap.

With the above structure, when the operating wheel 16 rotates leftward by a certain angle with respect to the caster guide 100,
As shown in FIG. 10, the right front end of the support member 106 of the axle support 104 abuts on the front regulation protrusion 108, and the regulation protrusion 108 serves as a stopper so that it cannot rotate further to the left. Conversely, the operation wheel 16 is the caster guide 100
, The axle support 10
The right rear end of the supporting member 106 is the rear side of the regulating protrusion 10.
8, the restricting projection 108 serves as a stopper, and cannot be further rotated to the right. That is, as shown in FIG.
The pivotable range of the operating wheel 16 with respect to the caster guide 100 is restricted to the range of the relative angle -A to A shown here. For example, the operation wheels 16 can be rotated left and right by 25 degrees with respect to the left and right center lines.

As shown in FIGS. 6 and 8, a connecting portion 109 is protruded from an appropriate position of the caster guide 100 (the rear portion in this embodiment).
As shown in FIG. 2, the two left and right caster guides 100 are connected by tie rods 157. The tie rod 157
Is connected to a pitman arm 159, and the other end of the pitman arm 159 is operatively connected to a handle shaft of the steering handle 14 via a gear or the like.

The steering handle 14 is connected via a pitman arm 159 and a connecting link 160 to a control arm 74 for rotating the movable swash plate of the pump of the steering HST 22.

With this configuration, the steering HS can be adjusted according to the turning angle of the steering handle 14.
The movable swash plate angle of the hydraulic pump at T22 is changed, and a difference occurs between the left and right rotation speeds of the traveling drive wheels 43, so that the body 1 is turned. The rotation angle of the caster guide 100 (the angle B shown in FIG.
4, the operation wheels 16 can be operated in a range of, for example, 65 degrees left and right. Further, as described above, the angle of the operation wheels 16 with respect to the caster guide 100 is restricted within a certain range. The angle is within a certain range (from -A to A) with respect to the turning direction (B) determined by 14, and the direction always follows the direction within the range. Therefore, the operation wheel 16 can rotate within a range of 90 degrees left and right.

Therefore, for example, the caster guide 100
When the steering wheel 14 is turned to the right while the machine 1 is stopped with the front operation wheels 16 facing left, the caster guide 100 is rotated accordingly,
The operation wheels 16 that are regulated to have an angle within a certain range with respect to the caster guide 100 also turn to the right.
Therefore, even when the vehicle 1 is started in this state, since the operation wheels 16 are directed rightward from the beginning, it is not necessary to largely rotate the angle of the operation wheels as described above. There is no S-shaped behavior.

When the vehicle 17 is traveling forward, the caster guide 100 and the operating wheels 16 are facing forward, but the vehicle is stopped from this state, the traveling direction is switched backward, and the vehicle is restarted. However, since the caster guide 100 is connected to the steering handle 14, it does not rotate. Therefore, the operating wheels 16 whose rotation range is restricted by the caster guide 100 cannot change the direction by 180 degrees. Therefore, the above-mentioned S-shaped behavior is not performed, and only the rotation in the front-back direction is performed.

An indicator 110 is provided on a connecting member for interlocking the steering handle 14 and the caster guide 100, so that the operator who is seated on the seat 17 can operate the wheel regardless of the position of the steering handle 14. 16 directions are easily understood. In the present embodiment, the indicator 110 extends forward from the pitman arm 159 and is arranged so that its tip is located in front of the front column 13 so as to be in the operator's view. Indicator 110 on guide 100 etc.
It is also possible to provide.

[0039]

The present invention has been configured as described above.
The following effects are obtained. That is, as described in claim 1, in an operation wheel that is turned left and right by a manual operation, the operation wheel is rotatably supported,
Because it is possible to turn left and right within the set angle, the resistance when steering by manual operation is small, it can be operated lightly, and when running on uneven ground, the operating wheel is Although it is turned and receives a reaction force, the force is reduced, and the operability is improved.

Further, in the second aspect, the traveling drive HS
In a traveling vehicle in which the left and right driving wheels are driven by T and the driving wheels can be steered by a steering HST, a support rod for mounting and supporting a rotatable operation wheel is supported by a caster guide. Attach the support rod so that it can turn left and right within the set angle,
Since the caster guide and the operating speed adjusting member of the steering HST are linked to the steering operating tool,
The S-shaped behavior is prevented. Therefore, the problem that the running resistance temporarily increases and the aircraft does not swing at the start of running to disturb the operator are also prevented.

Further, since the operating wheels are not dragged to damage the ground contact surface, there is no fear of damaging the field when applied to a mower or the like. Further, since the turning angle of the steering operation tool substantially corresponds to the turning angle of the operation wheel, the turning angle of the operation wheel can be estimated to some extent based on the turning angle of the steering operation tool. Can be performed with a sense of reliability by the operator, and the feeling is good.

Further, by making the right and left turning angles of the operating wheels substantially correspond to the turning angles of the steering operating tool via the caster guides, the operating wheels also have a steering function of generating a cornering force to some extent. Therefore, good turning performance can be obtained even when the torque of the hydraulic motor of the steering HST is small. Therefore, the capacity of the steering HST can be reduced, and as a result, the traveling vehicle can be made compact and the manufacturing cost can be reduced.

The operating wheels are free to turn within a certain angle range with respect to the caster guide.
It is possible to follow the turning direction easily and quickly as in the prior art, and the effect of high steering feeling when using a caster that can be turned 360 degrees is also maintained in the present invention.

In addition, since the indicator for indicating the traveling direction is arranged between the members connecting the caster guide and the steering operation tool, the operator can control the direction of the operating wheels in the field of view during the traveling operation. Thus, the steering operation can be performed without being confused even when the vehicle travels in the direction opposite to the direction of the operation wheels at a glance.

[Brief description of the drawings]

FIG. 1 is a side view showing an overall configuration of an embodiment in which the present invention is applied to a lawn mower.

FIG. 2 is a plan view of a steering drive device provided in the lawn mower.

FIG. 3 is a side sectional view of the same.

FIG. 4 is a plan sectional view of the same.

FIG. 5 is a skeleton diagram of a steering drive system.

FIG. 6 is a side view showing a support structure of a front wheel included in the lawn mower.

FIG. 7 is a front view of the same.

FIG. 8 is a plan view of the same.

FIG. 9 is a sectional view taken along the line XX in FIG. 7;

FIG. 10 is a view showing a state in which the axle support rotates from the state shown in FIG. 9 and the restricting projection contacts the support member of the axle support;

FIG. 11 is a plan view showing a relative rotatable range of an operation wheel with respect to a caster guide.

FIG. 12 is a schematic view of the loan mower.

FIG. 13 is a skeleton diagram using a planetary gear instead of a differential device in the steering drive system.

[Explanation of symbols]

 Reference Signs List 1 traveling vehicle (loan mower) 6 traveling differential 7 steering differential 14 steering operation tool (handle) 15 speed adjusting member (shift pedal) 16 operating wheel (front wheel) 21 traveling drive HST 22 steering HST 43 traveling drive Wheel 100 Caster Guide

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Norihiro Ishii 2-181-1, Inaji, Amagasaki-shi, Hyogo Prefecture Inside Kanzaki High-Tech Koki Seisakusho Co., Ltd. No. Kamizaki High-Tech Koki Manufacturing Co., Ltd. (72) Inventor Kenichi Takada 2-181-1, Inaji, Amagasaki-shi, Hyogo Co., Ltd. Kamizaki High-Tech Koki Manufacturing Co., Ltd. Town Commerce Boulevard No. 5943 Inside the Taftork Corporation (72) Inventor Keith Andrews United States 37814-1051 Tennessee Morristown Commerce Boulevard No. 5943 Inside the Taftork Corporation (72) Inventor Toshiyasu Hasegawa United States of America Neshi State 37814-1051 Morristown Commerce Boulevard 5943 No. Tafutoruku Corporation in the F-term (reference) 3D042 AA01 AA06 AB12 BA02 BA08 BC08 BC09 BD02

Claims (3)

[Claims] An operation wheel that is steered and rotated left and right by a manual operation, the operation wheel is rotatably supported, and
An operating wheel of a traveling vehicle, which is capable of turning left and right within a set angle. 2. In a traveling vehicle in which left and right driving wheels are driven by a traveling drive HST and the driving wheels can be steered by a steering HST, a support rod for mounting and supporting a rotatable operation wheel is supported by a caster guide. The caster guide is attached to the support rod so as to be able to turn left and right within a set angle, and the caster guide and an operating speed adjusting member of a steering HST are connected to a steering operation tool in an interlocking manner. Operation wheels. 3. The operating wheel of a traveling vehicle according to claim 2, wherein an indicator indicating a traveling direction is arranged between members for connecting said caster guide and a steering operation tool.