JP2016034809A - Traveling carriage - Google Patents

Traveling carriage Download PDF

Info

Publication number
JP2016034809A
JP2016034809A JP2014158670A JP2014158670A JP2016034809A JP 2016034809 A JP2016034809 A JP 2016034809A JP 2014158670 A JP2014158670 A JP 2014158670A JP 2014158670 A JP2014158670 A JP 2014158670A JP 2016034809 A JP2016034809 A JP 2016034809A
Authority
JP
Japan
Prior art keywords
wheel
force
traveling
auxiliary wheel
radius
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2014158670A
Other languages
Japanese (ja)
Inventor
真唯子 盛
Mayuko Mori
真唯子 盛
功幸 嵯峨山
Isayuki Sagayama
功幸 嵯峨山
和輝 飛田
Kazuteru Hida
和輝 飛田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NSK Ltd
Original Assignee
NSK Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NSK Ltd filed Critical NSK Ltd
Priority to JP2014158670A priority Critical patent/JP2016034809A/en
Publication of JP2016034809A publication Critical patent/JP2016034809A/en
Pending legal-status Critical Current

Links

Images

Abstract

PROBLEM TO BE SOLVED: To provide a traveling carriage capable of easily getting over a small upward step while an operational state when normally travelling forward.SOLUTION: In a traveling carriage, a front wheel diameter R, an auxiliary wheel diameter r, center-to-center distance L between an auxiliary wheel 16 and a front wheel 14 and an attachment angle ψ of the auxiliary wheel 16 to the front wheel 14 are configured so that by a principle of leverage where an input point of force of a holding part 11a is defined as a force point and a ground point with an upper face of an upward step 30 of the auxiliary wheel 16 is defined as a supporting point, when force Fx for travelling forward a base substance 10 is input to the force point, force for lifting the front wheel 14 to a height position where the front wheel 14 can get over the upward step 30 acts related to a point of action of the force capable of lifting the front wheel 14.SELECTED DRAWING: Figure 3

Description

本発明は、上り段差を乗り越える機能を有する走行台車に関する。   The present invention relates to a traveling carriage having a function of overcoming an ascending step.

従来、操作者が押すことで走行する走行台車で上り段差を乗り越える技術として、例えば、特許文献1に記載の技術がある。この技術は、前車軸に略T字状のリンクアームを回動可能に設けると共に、このリンクアームの略直角に交わる2本のアーム部の一方の端部及び他方の端部に、前主車輪と補佐輪とを、前主車輪の前方に補佐輪が位置する位置関係となるように回転自在に支持している。更に、リンクアームの残りのアーム部の端部に補助ハンドルを連結している。そして、前主車輪が上り段差に当接したときに、補助ハンドルを前方に押し上げることでリンクアーム部が回動し、補助ハンドルの力の入力点を力点とし、補佐輪の段差上面との接地点を支点としたてこの原理によって、前主車輪を持ち上げる力を作用させて、段差の乗り越えを容易とするものである。   Conventionally, for example, a technique described in Patent Document 1 is a technique for overcoming an ascending step with a traveling carriage that travels when pressed by an operator. In this technique, a substantially T-shaped link arm is rotatably provided on a front axle, and a front main wheel is provided at one end portion and the other end portion of two arm portions intersecting at substantially right angles of the link arm. And the auxiliary wheel are rotatably supported so that the auxiliary wheel is positioned in front of the front main wheel. Further, an auxiliary handle is connected to the end of the remaining arm portion of the link arm. When the front main wheel comes into contact with the ascending step, the link handle is rotated by pushing the auxiliary handle forward, and the force input point of the auxiliary handle is used as the force point, and the contact wheel is in contact with the upper surface of the step. By using this principle with the point as a fulcrum, a force to lift the front main wheel is applied to facilitate overcoming the step.

特開2006−103518JP 2006-103518 A

しかしながら、上記特許文献1の従来技術は、通常走行時に操作する操行把手フレームとは異なる補助ハンドルを押し上げる必要があるため、操作者が意図して作動させなければ段差を乗り越えることができないという問題がある。また、このときに操行把手フレームから補助ハンドルに持ち替えるという煩わしい作業も必要となる。また、補助ハンドルを別途設ける必要があるため重量やコストが増加するという問題もある。   However, since the prior art of Patent Document 1 needs to push up an auxiliary handle that is different from the steering handle frame that is operated during normal running, there is a problem that the step cannot be overcome unless the operator intentionally operates it. is there. Further, at this time, a troublesome work of changing the operation handle frame to the auxiliary handle is required. In addition, there is a problem that the weight and cost increase because it is necessary to provide an auxiliary handle separately.

そこで、本発明は、このような従来の技術の有する未解決の課題に着目してなされたものであって、通常の前方走行時の操作状態のままで容易に上り段差を乗り越えることが可能な走行台車を提供することを目的としている。   Therefore, the present invention has been made paying attention to such an unsolved problem of the conventional technology, and can easily climb over an ascending step in the normal operation state during forward traveling. The purpose is to provide a traveling cart.

〔形態1〕 上記目的を達成するために、形態1の走行台車は、基体と、基体の下部に回転自在に支持された走行輪と、基体の走行輪よりも前方側に回転自在に支持され、かつ、走行輪によって平坦路を走行時に非接地となる高さ位置に設けられた補助輪と、基体の上部に設けられ、操作者が基体を走行輪によって走行させる力を入力可能な操作部と、を備え、操作部の力の入力点を力点とし、かつ補助輪の上り段差の上面との接地点を支点としたてこの原理によって、基体を前進走行させる力を力点に入力したときに、走行輪を上り段差を乗り越え可能な高さ位置まで持ち上げる力が作用するように、走行輪の半径、補助輪の半径、補助輪と走行輪との中心間距離及び走行輪に対する補助輪の取付角度が構成されている。   [Embodiment 1] In order to achieve the above object, a traveling carriage of embodiment 1 is supported on a base body, a traveling wheel rotatably supported on a lower portion of the base body, and a front side of the traveling wheel of the base body. And an auxiliary wheel provided at a height position that is not grounded when traveling on a flat road by a traveling wheel, and an operation unit provided at the upper part of the base body and capable of inputting a force for an operator to travel the base body by the traveling wheel. And when the force that makes the base move forward is input to the force point by using this principle with the force input point of the operation portion as the force point and the ground contact point with the upper surface of the ascending step of the auxiliary wheel as a fulcrum. The radius of the traveling wheel, the radius of the auxiliary wheel, the distance between the center of the assisting wheel and the traveling wheel, and the attachment of the assisting wheel to the traveling wheel so that the force to lift the traveling wheel to a height position where it can climb over the step is applied. The angle is configured.

このような構成であれば、基体を前進走行中に前方に上り段差がある場合に、前輪よりも先に補助輪が段差上面に接地し、補助輪の接地点を支点、操作部の力の入力点を力点としたてこの原理によって、前輪を段差上へと容易に持ち上げることが可能となる。
これによって、操作者が、特別な操作をすることなく、通常通りに基体を前進走行させる方向の力を加えることで、てこの原理を利用して、上り段差を容易に乗り越えさせることができるという効果が得られる。
With such a configuration, when there is a step up in front of the base while traveling forward, the auxiliary wheel contacts the upper surface of the step before the front wheel, and the grounding point of the auxiliary wheel serves as a fulcrum and the force of the operation unit With this principle of using the input point as a power point, it is possible to easily lift the front wheel onto the step.
As a result, the operator can easily overcome the ascending step using the lever principle by applying a force in the direction in which the base moves forward as usual without performing a special operation. An effect is obtained.

〔形態2〕 更に、形態2の走行台車は、形態1の構成に対して、走行輪は、基体の前方側に設けられた前輪と、基体の後方側に設けられた後輪とを含み、前輪の半径をR、補助輪の半径をr、中心間距離をL、取付角度をψ、前輪の接地点と補助輪の接地点との間の距離をL’、基体の質量と重力とによって前輪にかかる力をmg、力点に入力される基体を前進走行させる水平方向の力をFx、上り段差の高さをH、走行輪の接地面から力点までの高さをh、基体の重心と後輪とにかかる力によるモーメントの和をM0として、下式(1)〜(3)を満たす寸法及び角度に、走行輪の半径、補助輪の半径、中心間距離及び取付角度が構成されている。
L’・mg・cosψ<Fx・h−M0 …(1)
L’=((Lcosψ)2+H21/2 …(2)
r=L・sinψ+R−H …(3)
[Embodiment 2] Further, in the traveling carriage of the embodiment 2, the traveling wheel includes a front wheel provided on the front side of the base body and a rear wheel provided on the rear side of the base body with respect to the configuration of the form 1. The radius of the front wheel is R, the radius of the auxiliary wheel is r, the distance between the centers is L, the mounting angle is ψ, the distance between the ground point of the front wheel and the ground point of the auxiliary wheel is L ′, the mass of the base body and the gravity The force applied to the front wheel is mg, the horizontal force that is input to the power point to move the base forward is Fx, the height of the ascending step is H, the height from the ground contact surface of the traveling wheel to the power point is h, the center of gravity of the base is The radius of the traveling wheel, the radius of the auxiliary wheel, the center-to-center distance, and the mounting angle are configured to have a size and angle satisfying the following equations (1) to (3), where M 0 is the sum of moments due to the force applied to the rear wheels. ing.
L ′ · mg · cos ψ <Fx · h−M 0 (1)
L ′ = ((L cos ψ) 2 + H 2 ) 1/2 (2)
r = L · sinψ + R−H (3)

このような構成であれば、基体を前進走行中に前方に補助輪の下端に接触する程度の高さの上り段差がある場合に、前輪よりも先に補助輪が段差上面に接地し、補助輪の接地点を支点、操作部の力の入力点を力点としたてこの原理によって、前輪を段差上へと容易に持ち上げることが可能となる。
これによって、操作者が、特別な操作をすることなく、通常通りに基体を前進走行させる方向の力を加えることで、てこの原理を利用して、補助輪の下端位置よりも低い高さの上り段差を容易に乗り越えさせることができるという効果が得られる。
With such a configuration, when there is an ascending step that is high enough to come into contact with the lower end of the auxiliary wheel while the vehicle is traveling forward, the auxiliary wheel contacts the upper surface of the step before the front wheel, and the auxiliary By using this principle with the contact point of the wheel as a fulcrum and the input point of the force of the operation unit as the force point, the front wheel can be easily lifted onto the step.
This allows the operator to apply a force in the direction to advance the base body as usual without performing any special operation, and by utilizing the principle of the lever, the height lower than the lower end position of the auxiliary wheel. The effect that it is possible to easily get over the ascending step is obtained.

〔形態3〕 更に、形態3の走行台車は、形態2の構成に対して、前輪の半径Rを補助輪の半径r以上の大きさの寸法に構成し、中心間距離L及び取付角度ψを、下式(4)を満たす寸法及び角度に構成した。
0<L<H/sinψ …(4)
このような構成であれば、平坦路走行時に非接地となる補助輪の半径が、前輪の半径よりも小さくなり、車輪の配置バランスや、重量バランス等のバランスのとりやすい構成とすることができるという効果が得られる。
[Form 3] Furthermore, the traveling carriage of form 3 is configured such that the radius R of the front wheel is larger than the radius r of the auxiliary wheel with respect to the structure of form 2, and the center distance L and the mounting angle ψ are set. The size and angle satisfy the following formula (4).
0 <L <H / sinψ (4)
With such a configuration, the radius of the auxiliary wheel that is not grounded when traveling on a flat road is smaller than the radius of the front wheel, and it is possible to provide a configuration that is easy to balance, such as wheel arrangement balance and weight balance. The effect is obtained.

〔形態4〕 更に、形態4の走行台車は、形態3の構成に対して、力mgが補助輪にかかるとして、下式(5)及び(6)を満たす寸法及び角度に、走行輪の半径、補助輪の半径、中心間距離及び取付角度が構成されている。
(r2−(L・sinψ+R−H)21/2・mg<(h−L・sinψ−R)・Fx−M0 …(5)
H<L・sinψ+R …(6)
[Form 4] Further, the traveling carriage of form 4 has a radius of the running wheel in a size and an angle satisfying the following expressions (5) and (6), assuming that the force mg is applied to the auxiliary wheel with respect to the configuration of form 3. The radius of the auxiliary wheel, the center-to-center distance, and the mounting angle are configured.
(R 2 − (L · sin ψ + R−H) 2 ) 1/2 · mg <(h−L · sin ψ−R) · Fx−M 0 (5)
H <L · sinψ + R (6)

このような構成であれば、補助輪の下端位置よりも高くかつ補助輪の中心位置よりも低い高さの上り段差に対して、補助輪を段差上に乗り上げることが可能となり、補助輪の接地点を支点、操作部の力の入力点を力点としたてこの原理によって、前輪を段差上へと容易に持ち上げることが可能となる。
これによって、操作者が、特別な操作をすることなく、通常通りに基体を前進走行させる方向の力を加えることで、てこの原理を利用して、補助輪の下端位置よりも高くかつ補助輪の中心位置よりも低い高さの上り段差を容易に乗り越えさせることができるという効果が得られる。
With such a configuration, it is possible to ride the auxiliary wheel on the step with respect to the upward step which is higher than the lower end position of the auxiliary wheel and lower than the center position of the auxiliary wheel. By using this principle with the point as a fulcrum and the force input point of the operation unit as the force point, it is possible to easily lift the front wheel onto the step.
This allows the operator to apply a force in the direction in which the base body moves forward as usual without performing any special operation. An effect is obtained in that it is possible to easily get over an ascending step having a height lower than that of the center position.

〔形態5〕 更に、形態5の走行台車は、形態2乃至4のいずれか1の構成に対して、前輪をアクチュエータによって回転駆動する回転駆動機構を備える。
このような構成であれば、回転駆動機構によって、前輪を回転駆動することが可能となる。
これによって、例えば、回転駆動機構によって、走行方向への走行に必要な前輪の回転力をアシストすることで、操作者が操作部に入力する力を小さくすることが可能となり、操作者の負担を軽減することができるという効果が得られる。
[Embodiment 5] Furthermore, the traveling carriage of embodiment 5 is provided with a rotational drive mechanism that rotationally drives the front wheels by an actuator, in contrast to the configuration of any one of embodiments 2 to 4.
With such a configuration, the front wheels can be rotationally driven by the rotational drive mechanism.
As a result, for example, the rotational driving mechanism assists the rotational force of the front wheels required for traveling in the traveling direction, thereby reducing the force input to the operation unit by the operator and reducing the burden on the operator. The effect that it can be reduced is obtained.

実施形態に係る走行台車1の構成例を示す側面図である。It is a side view showing an example of composition of traveling cart 1 concerning an embodiment. (a)〜(d)は、基体10を下面側から正面視した模式図であり、車輪構成の例を示す図である。(A)-(d) is the schematic diagram which looked at the base | substrate 10 from the lower surface side, and is a figure which shows the example of a wheel structure. 補助輪16の下端が段上にちょうど接触する高さの上り段差を踏破するための各パラメータの一例を示す模式図である。It is a schematic diagram which shows an example of each parameter for breaking through the uphill level of the height where the lower end of the auxiliary wheel 16 just contacts a step. 補助輪径rと前輪径Rとの大小関係を規定しない場合と、「r≦R」に規定した場合の中心間距離Lと取付角度ψとの関係の一例を示す図である。It is a figure which shows an example of the relationship between the distance L between centers when the magnitude relationship of the auxiliary wheel diameter r and the front wheel diameter R is not prescribed | regulated, and the case where it is prescribed | regulated to "r <= R". 補助輪16の下端位置よりも低い高さの上り段差を踏破する場合の動作例を示す図であり、(a)は、補助輪16を用いなくても良い場合の動作例を示す模式図であり、(b)は、補助輪16を用いる場合の動作例を示す模式図である。It is a figure which shows the operation example in the case of going through the climbing level | step difference lower than the lower end position of the auxiliary wheel 16, (a) is a schematic diagram which shows the operation example when it is not necessary to use the auxiliary wheel 16. FIG. 8B is a schematic diagram illustrating an operation example when the auxiliary wheel 16 is used. 補助輪16の下端位置よりも高くかつ中心位置よりも低い高さの上り段差を踏破するための各パラメータの一例を示す模式図である。It is a schematic diagram which shows an example of each parameter for passing through the uphill level which is higher than the lower end position of the auxiliary wheel 16 and lower than the center position. 段差踏破時の力Fxと高さHとの関係の一例を示す図である。It is a figure which shows an example of the relationship between the force Fx at the time of stepping over, and height H. FIG. (a)〜(d)は、補助輪16の下端が段上にちょうど接触する高さの上り段差30を踏破する場合の動作例を示す図である。(A)-(d) is a figure which shows the operation example in the case of traversing the climbing level | step difference 30 of the height where the lower end of the auxiliary wheel 16 just contacts a step. (a)〜(d)は、補助輪16の下端位置よりも高くかつ中心位置よりも低い高さの上り段差50を踏破する場合の動作例を示す図である。(A)-(d) is a figure which shows the operation example in the case of traversing the uphill level 50 of the height higher than the lower end position of the auxiliary wheel 16, and lower than a center position.

(構成)
本実施形態に係る走行台車1は、図1に示すように、上方に凸の円弧形状の基体10と、基体10に設けられた操作部11と、基体10の下方の前方寄りに設けられた旋回機構12と、旋回機構12に連結する前輪支持部13と、前輪支持部13に回転自在に支持された走行輪としての前輪14と、を備えている。更に、走行台車1は、基体10の前端部に設けられた補助輪支持部15と、補助輪支持部15に回転自在に支持された補助輪16と、基体10の後端部に設けられた後輪支持部17と、後輪支持部17に回転自在に支持された走行輪としての後輪18とを備えている。
(Constitution)
As shown in FIG. 1, the traveling cart 1 according to the present embodiment is provided in an upwardly convex arcuate base 10, an operation unit 11 provided on the base 10, and a front side below the base 10. A turning mechanism 12, a front wheel support portion 13 connected to the turning mechanism 12, and a front wheel 14 as a running wheel rotatably supported by the front wheel support portion 13 are provided. Further, the traveling carriage 1 is provided at an auxiliary wheel support portion 15 provided at the front end portion of the base body 10, an auxiliary wheel 16 rotatably supported by the auxiliary wheel support portion 15, and a rear end portion of the base body 10. A rear wheel support portion 17 and a rear wheel 18 as a traveling wheel rotatably supported by the rear wheel support portion 17 are provided.

操作部11は、把持部11aと、ポール部11bとから構成され、ポール部11bの長手方向の上端は把持部11aに連結し、長手方向の下端部は基体10の上面に固定支持されている。また、操作部11は、基体10の上面から斜め後方に向かって所定角度だけ傾いて支持されている。
旋回機構12は、鉛直方向下方に延びる旋回軸を備え、この旋回軸の上端は、基体10の下面に軸受を介して回転自在に支持されている。
The operation unit 11 includes a gripping part 11a and a pole part 11b. The upper end in the longitudinal direction of the pole part 11b is connected to the gripping part 11a, and the lower end in the longitudinal direction is fixedly supported on the upper surface of the base body 10. . In addition, the operation unit 11 is supported by being inclined at a predetermined angle from the upper surface of the base body 10 obliquely rearward.
The turning mechanism 12 includes a turning shaft that extends downward in the vertical direction, and the upper end of the turning shaft is rotatably supported on the lower surface of the base body 10 via a bearing.

前輪支持部13は、上端側が旋回機構12の旋回軸に固定支持され、下端側に旋回軸の軸方向及び基体10の前後方向と直交する軸方向の前輪車軸13aを備えており、この前輪車軸13aを介して前輪14が回転自在に支持されている。かかる構成によって、前輪車軸13aは前輪14と共に旋回軸回りに回動し、前輪14は前輪車軸13a回りに回動する。   The front wheel support portion 13 has an upper end fixedly supported on the turning shaft of the turning mechanism 12, and a lower wheel provided with a front wheel axle 13a in the axial direction orthogonal to the axial direction of the turning shaft and the front-rear direction of the base 10, and this front wheel axle. A front wheel 14 is rotatably supported via 13a. With this configuration, the front wheel axle 13a rotates about the turning axis together with the front wheel 14, and the front wheel 14 rotates about the front wheel axle 13a.

更に、前輪支持部13は、前輪車軸13aを回転駆動する回転駆動機構19を備えている。この回転駆動機構19は、操作部11を介して入力される力を検出する力センサと、前輪車軸に回転力を付与するモータと、力センサの検出値に基づきモータを駆動制御するモータ制御回路とを備えている。本実施形態では、例えば、プーリ及びベルト等を介してモータの回転力を前輪車軸13aに伝達すると共に、操作部11を介した基体10を前進方向へと押す力の入力を力センサで検出し、基体10が前進する方向に前輪車軸(即ち前輪14)を回転させるアシスト回転力を付与する。   Further, the front wheel support portion 13 includes a rotational drive mechanism 19 that rotationally drives the front wheel axle 13a. The rotational drive mechanism 19 includes a force sensor that detects a force input via the operation unit 11, a motor that applies a rotational force to the front wheel axle, and a motor control circuit that controls the drive of the motor based on a detection value of the force sensor. And. In the present embodiment, for example, the rotational force of the motor is transmitted to the front wheel axle 13a via a pulley, a belt, and the like, and an input of a force that pushes the base body 10 in the forward direction via the operation unit 11 is detected by a force sensor. The assist torque that rotates the front wheel axle (that is, the front wheel 14) in the direction in which the base body 10 moves forward is applied.

補助輪支持部15は、前輪支持部13よりも前方側の基体10の前端部から下方に向かって延びるアーム部を備え、アーム部の上端部が基体10に固定支持されている。更に、アーム部の下端部に前輪車軸13aと同じ軸方向の補助輪車軸を備えている。そして、補助輪車軸を介して前輪14の半径よりも小さい半径の補助輪16が補助輪車軸回りに回転自在に支持されている。なお、補助輪支持部15及びそのアーム部は、基体10が平坦路を走行するときに、補助輪16が接地しない高さ位置となるように配設位置や長さが構成されている。   The auxiliary wheel support portion 15 includes an arm portion extending downward from the front end portion of the base body 10 in front of the front wheel support portion 13, and the upper end portion of the arm portion is fixedly supported by the base body 10. Further, an auxiliary wheel axle in the same axial direction as the front wheel axle 13a is provided at the lower end of the arm portion. An auxiliary wheel 16 having a radius smaller than the radius of the front wheel 14 is supported via the auxiliary wheel axle so as to be rotatable around the auxiliary wheel axle. The auxiliary wheel support portion 15 and its arm portion are arranged and positioned so that the auxiliary wheel 16 is at a height position at which the base wheel 10 does not contact when the base 10 travels on a flat road.

後輪支持部17は、基体10の後端部から円弧形状に沿って延びるアーム部を備え、アーム部の上端部が基体10の後端部に固定支持されている。更に、アーム部の下端部に前輪車軸と同じ軸方向の後輪車軸を備えている。そして、後輪車軸を介して前輪14よりも小さい半径の後輪18が後輪車軸回りに回転自在に支持されている。   The rear wheel support portion 17 includes an arm portion extending along a circular arc shape from the rear end portion of the base body 10, and the upper end portion of the arm portion is fixedly supported by the rear end portion of the base body 10. Further, a rear wheel axle in the same axial direction as the front wheel axle is provided at the lower end of the arm portion. A rear wheel 18 having a smaller radius than the front wheel 14 is supported via the rear wheel axle so as to be rotatable around the rear wheel axle.

(車輪の構成について)
次に、図2に基づき、走行台車1の車輪の構成について説明する。
本実施形態の走行台車1は、図2(a)に示す車輪構成となっている。即ち、図2(a)に示すように、前輪車軸13aの一端側に前輪14aが、他端側に前輪14bが固定支持されており、補助輪16は、前輪車軸13aの中央位置に合わせて前方に1輪が設けられている。また、後輪18は、前輪車軸13aの中央位置に合わせて後方に1輪が設けられている。
(About wheel configuration)
Next, the configuration of the wheels of the traveling carriage 1 will be described with reference to FIG.
The traveling cart 1 of this embodiment has a wheel configuration shown in FIG. That is, as shown in FIG. 2A, a front wheel 14a is fixedly supported on one end side of the front wheel axle 13a and a front wheel 14b is fixedly supported on the other end side, and the auxiliary wheel 16 is aligned with the center position of the front wheel axle 13a. One wheel is provided in front. The rear wheel 18 is provided with one wheel on the rear side in accordance with the center position of the front wheel axle 13a.

なお、走行台車1の車輪構成は、図2(a)の構成に限らず、例えば、図2(b)に示すように、同軸2輪の前輪ユニット14L及び14Rを基体10の前方側の左右位置に配置し、これに合わせて、補助輪2輪、後輪2輪とした車輪構成としてもよい。
また、例えば、図2(c)に示すように、図2(a)の前輪の構成において、後輪18を後輪18L及び18Rの2輪とした構成としてもよい。また、図2(a)において、前輪14を同軸2輪の構成とすることに限らず、例えば、図2(d)に示すように、前輪14を1輪とする構成としてもよい。また、前輪14を1輪とする構成は、図2(b)〜(c)にも適用可能である。また、前輪を同軸2輪とした構成において、補助輪16も2輪とする構成としてもよい。
Note that the wheel configuration of the traveling carriage 1 is not limited to the configuration of FIG. 2A, and for example, as shown in FIG. It is good also as a wheel structure which has arrange | positioned in a position and set it as two auxiliary wheels and two rear wheels according to this.
Further, for example, as shown in FIG. 2 (c), in the configuration of the front wheel in FIG. 2 (a), the rear wheel 18 may be configured as two rear wheels 18L and 18R. Further, in FIG. 2A, the front wheel 14 is not limited to the configuration of two coaxial wheels, and for example, as shown in FIG. 2D, the front wheel 14 may be configured as one wheel. Moreover, the structure which makes the front wheel 14 one wheel is applicable also to FIG.2 (b)-(c). Further, in the configuration in which the front wheels are two coaxial wheels, the auxiliary wheel 16 may be configured to have two wheels.

また、前輪車軸13aを回転駆動する回転駆動機構19を設ける構成としたが、この構成に限らず、回転駆動機構19に加えて、旋回軸を回転駆動するための駆動源(モータ等)を有する回転駆動機構を設ける構成としてもよい。また、車輪構成を、例えば、図2(b)に示す構成とした場合、前輪車軸13La及び13Raを回転駆動する回転駆動機構を別々に設けて独立して前輪ユニットを回転駆動し、前輪ユニット14R及び14Lの間の距離が十分にある場合に限っては、旋回軸を受動軸とする構成としてもよい。   In addition, the rotational drive mechanism 19 for rotationally driving the front wheel axle 13a is provided. However, the present invention is not limited to this configuration, and in addition to the rotational drive mechanism 19, a drive source (motor or the like) for rotationally driving the turning shaft is provided. It is good also as a structure which provides a rotational drive mechanism. Further, when the wheel configuration is, for example, the configuration shown in FIG. 2B, a rotational drive mechanism that rotationally drives the front wheel axles 13La and 13Ra is separately provided to rotationally drive the front wheel unit independently, and the front wheel unit 14R. And only when there is sufficient distance between 14L, it is good also as a structure which makes a pivot axis a passive axis.

また、前輪14を同軸2輪とする構成を例に挙げたが、この構成に限らず、同軸3輪以上とする構成としてもよい。また、後輪18についても同軸2輪以上とする構成としてもよい。また、前輪14を2輪又は2ユニット設ける構成を例に挙げたが、この構成に限らず、3輪又は3ユニット以上を設ける構成としてもよい。また、後輪18を2輪設ける構成を例に挙げて説明したが、この構成に限らず、後輪18についても、3輪又は3ユニット以上を設ける構成としてもよい。   In addition, the configuration in which the front wheels 14 are two coaxial wheels has been described as an example. However, the configuration is not limited to this configuration, and a configuration with three or more coaxial wheels may be employed. Further, the rear wheel 18 may be configured to have two or more coaxial wheels. In addition, although the configuration in which the front wheels 14 are provided with two wheels or two units has been described as an example, the configuration is not limited to this configuration, and a configuration in which three wheels or three units or more are provided may be employed. In addition, the configuration in which two rear wheels 18 are provided has been described as an example. However, the configuration is not limited to this configuration, and the rear wheels 18 may have three wheels or three or more units.

(段差踏破のための構成)
本実施形態では、操作者による操作部11の把持部11aへの力の入力点を力点、補助輪16の上り段差との接触点を支点としたてこの原理によって、前輪14を持ち上げる力の作用点に対して、前輪14を上り段差を乗り越える高さ位置へと持ち上げる力が作用するように走行台車1を構成している。
具体的には、力点に基体10を前方へと向かって走行させる力が加わったときに、てこの原理によって、作用点に前輪14を段差を乗り越える高さ位置まで持ち上げる力を作用させる構成としている。
以下、走行台車1を、上記てこの原理が有効に作用する構成とするための設計例を説明する。
(Configuration for stepping over steps)
In this embodiment, the action of the force that lifts the front wheel 14 by the lever principle with the input point of the force applied to the gripping part 11a of the operation part 11 by the operator as a power point and the contact point with the ascending step of the auxiliary wheel 16 as a fulcrum. The traveling carriage 1 is configured such that a force that lifts the front wheel 14 to a height position over an ascending step is applied to the point.
Specifically, when a force that causes the base body 10 to travel forward is applied to the power point, a force that lifts the front wheel 14 to a height position over the step is applied to the action point by the lever principle. .
Hereinafter, a design example for making the traveling carriage 1 have a configuration in which the above-described principle works effectively will be described.

まず、図3〜図4に基づき、乗り越える上り段差の高さが補助輪16の下にちょうど収まる高さ(補助輪16の下端が段上にちょうど接触する高さ)の場合について説明する。
図3に示すように、補助輪16の半径である補助輪径をr、前輪14の半径である前輪径をR、補助輪16と前輪14との中心間距離をL、前輪14に対する補助輪16の取付角度をψとする。また、走行台車1の質量をm、基体10を前方へと向かって走行させる水平方向の力(基体10を前方へと押す水平方向の力)をFx、上り段差30の高さをH、力Fxの入力点となる把持部11aまでの地面からの高さをhとする。また、走行台車1の質量mが前輪14にかかっているとし、地面及び段差30と前輪14との摩擦係数は十分高いこととする。
First, based on FIGS. 3 to 4, a description will be given of a case where the height of the climbing step over the height is just below the auxiliary wheel 16 (the height at which the lower end of the auxiliary wheel 16 just contacts the step).
As shown in FIG. 3, the auxiliary wheel diameter which is the radius of the auxiliary wheel 16 is r, the front wheel diameter which is the radius of the front wheel 14 is R, the distance between the centers of the auxiliary wheel 16 and the front wheel 14 is L, and the auxiliary wheel with respect to the front wheel 14. The mounting angle of 16 is ψ. Also, the mass of the traveling carriage 1 is m, the horizontal force that moves the base body 10 forward (the horizontal force that pushes the base body 10 forward) is Fx, the height of the ascending step 30 is H, the force Let h be the height from the ground to the gripping part 11a that is the input point of Fx. Further, it is assumed that the mass m of the traveling carriage 1 is applied to the front wheel 14, and the friction coefficient between the ground and the step 30 and the front wheel 14 is sufficiently high.

ここでは、段差30を乗り越える(以下、「踏破する」という場合がある)のに必要な条件を提示し、この条件を満たすRとr及びLとψを決定する方法を説明する。
ここで、補助輪16が段差30上に接地する点を支点、操作者が基体10を押す力Fxが加わる点を力点としたてこの原理を考えると、下式(7)及び(8)の関係が成り立つときに前輪14は地面から離れて浮き上がる。なお、L’は、図3に示すように、補助輪16の接地点と前輪14の接地点との間の距離である。また、mgは、走行台車1の質量mによって前輪14にかかる力である。即ち、質量mに重力加速度gを乗算した値である。また、実際には走行台車1の重心と後輪18にかかる力によるモーメントについて考慮する必要があり、ここでは、そのモーメントの和をM0とする。
Here, a condition necessary for getting over the step 30 (hereinafter sometimes referred to as “breaching”) is presented, and a method for determining R, r, L, and ψ satisfying this condition will be described.
Here, considering this principle with the point where the auxiliary wheel 16 contacts the step 30 as a fulcrum and the point where the force Fx that the operator pushes the base body 10 is applied, the following equations (7) and (8) are considered. When the relationship is established, the front wheel 14 floats away from the ground. Note that L ′ is the distance between the ground point of the auxiliary wheel 16 and the ground point of the front wheel 14 as shown in FIG. Further, mg is a force applied to the front wheel 14 by the mass m of the traveling carriage 1. That is, it is a value obtained by multiplying the mass m by the gravitational acceleration g. Actually, it is necessary to consider the moment due to the force applied to the center of gravity of the traveling carriage 1 and the rear wheel 18, and here, the sum of the moments is M 0 .

L’・mg・cosψ<Fx・h−M0 …(7)
L’=((Lcosψ)2+H21/2 …(8)
更に、走行台車1のバランス等を考慮すると「r≦R」であることが望ましい。rは、幾何学的に下式(9)のように示される。
r=L・sinψ+R−H …(9)
上式(9)と、「r≦R」及び「H>0」とから、下式(10)に示す新たな条件を提示できる。
L ′ · mg · cos ψ <Fx · h−M 0 (7)
L ′ = ((L cos ψ) 2 + H 2 ) 1/2 (8)
Furthermore, it is desirable that “r ≦ R” in consideration of the balance of the traveling carriage 1 and the like. r is geometrically expressed as the following equation (9).
r = L · sinψ + R−H (9)
From the above equation (9) and “r ≦ R” and “H> 0”, a new condition represented by the following equation (10) can be presented.

0<L<H/sinψ …(10)
以下、具体的な数値例を挙げて、上式(7)〜(10)の条件を満たす設計値の範囲を決めていく。
走行台車1の質量を10[kg]とし、バリアフリー法で定める許容段差が20[mm]であることから、段差30の高さHを20[mm]とする。また、「独立行政法人 製品評価技術基盤機構」が提供する人間特性データベースから、高齢者の押す力は平均で60[N]程度であることを考慮して、ここではこの半分の値である30[N]をFxの値とする。
0 <L <H / sinψ (10)
Hereinafter, specific numerical examples will be given to determine the range of design values that satisfy the conditions of the above equations (7) to (10).
Since the mass of the traveling carriage 1 is 10 [kg] and the allowable step determined by the barrier-free method is 20 [mm], the height H of the step 30 is 20 [mm]. Also, from the human characteristics database provided by “Independent Administrative Institution Product Evaluation Technology Infrastructure”, considering that the pressing force of elderly people is about 60 [N] on average, this value is half here. Let [N] be the value of Fx.

また、政府統計の総合窓口(e−Stat)の提供する身長の性別及び年齢別の平均値の情報から、高齢者(70歳以上)の女性の平均身長が150[cm]であることを考慮して、把持部11aまでの地面からの高さhを1000[mm]とする。即ち、高さhが1000[mm]となるようにポール部11bの長さや配設角度を構成する。
ここで、平均身長として女性のデータを使用した理由は、ある施設での調査でシルバーカーを使用する高齢者のうち97[%]が女性であるという報告があるためである(投稿論文「歩行補助車を使用している高齢者の外出状況と交通上の課題」安心院朗子 筑波大学人間総合科学研究所 LATSS Review Vol.35 No.02参照)。
In addition, based on the information on average values by sex and age of height provided by the government statistics general window (e-Stat), it is considered that the average height of elderly women (over 70 years old) is 150 [cm] Then, the height h from the ground up to the grip portion 11a is set to 1000 [mm]. That is, the length and the arrangement angle of the pole portion 11b are configured so that the height h is 1000 [mm].
Here, the reason why women's data was used as the average height is that 97% of the elderly people who use silver cars in a survey at a facility reported that they were women (contributed paper “Walking” “The outing situation and traffic issues of elderly people using auxiliary vehicles” Ako Ajimu, Institute of Comprehensive Human Sciences, University of Tsukuba LATSS Review Vol.35 No.02).

なお、ここでは、モーメントの和M0を考慮しないこととする。
上式(7)〜(8)の条件を満たす中心間距離Lと取付角度ψとの関係は、図4中の曲線LAとなる。
また、上式(10)の条件を満たす中心間距離Lと取付角度ψとの関係は、図4中の曲線LBとなる。
Here, the sum of moments M 0 is not considered.
The relationship between the center-to-center distance L that satisfies the conditions of the above equations (7) to (8) and the mounting angle ψ is a curve LA in FIG.
Further, the relationship between the center distance L that satisfies the condition of the above expression (10) and the mounting angle ψ is a curve LB in FIG.

なお、モーメントの和M0を考慮した場合、曲線LA及びLBは上に変位する。
また、走行台車1の全長は使いやすさの点から最大でも600[mm]程度であり、走行台車1の安定性を考慮すると中心間距離Lはこれより長くなることはない。そのため、図4には、「L≦600[mm](L=600[mm]のとき、ψ=45[deg])の範囲のみ表示した。また、上式(10)の条件から「ψ>0[deg]」であるため、図4には、「0[deg]<ψ<45[deg]」の範囲のみ表示した。また、SG規格によってシルバーカーの前輪径は100[mm]以上と規定されていることから、実際には「L≧50[mm]」となる。
When the sum of moments M 0 is taken into account, the curves LA and LB are displaced upward.
Further, the total length of the traveling carriage 1 is about 600 [mm] at the maximum from the viewpoint of ease of use, and the center distance L does not become longer than this in consideration of the stability of the traveling carriage 1. Therefore, FIG. 4 shows only the range of “L ≦ 600 [mm] (φ = 45 [deg] when L = 600 [mm]). Further, from the condition of the above equation (10),“ ψ> Since “0 [deg]”, only the range of “0 [deg] <ψ <45 [deg]” is displayed in FIG. Further, since the front wheel diameter of the silver car is defined as 100 [mm] or more by the SG standard, “L ≧ 50 [mm]” is actually satisfied.

図4中の曲線LAに示すように、補助輪径rと前輪径Rとの大小関係を規定しない場合に、高さ20[mm]の上り段差を乗り越える場合、補助輪16と前輪14との中心間距離Lが長くなるほど取付角度ψが大きくなる。
また、図4中の曲線LBに示すように、補助輪径rと前輪径Rとの大小関係を「r≦R」と規定した場合に、高さ20[mm]の上り段差を乗り越える場合、中心間距離Lが1200[mm]の近傍から300[mm]の近傍までは、取付角度ψが5[deg]以下と小さな変化となっており、300[mm]から先は中心間距離Lが短くなるほど取付角度ψが急激に大きくなる。
As shown by the curve LA in FIG. 4, when the magnitude relationship between the auxiliary wheel diameter r and the front wheel diameter R is not defined, when the climbing step of 20 [mm] is overcome, the auxiliary wheel 16 and the front wheel 14 The longer the distance L between the centers, the larger the mounting angle ψ.
In addition, as shown by a curve LB in FIG. 4, when the magnitude relationship between the auxiliary wheel diameter r and the front wheel diameter R is defined as “r ≦ R”, overcoming an ascending step of 20 [mm] in height, From the vicinity of the center distance L of 1200 [mm] to the vicinity of 300 [mm], the mounting angle ψ is a small change of 5 [deg] or less. The shorter the mounting angle ψ, the larger the mounting angle ψ.

曲線LAとLBとの関係から、補助輪径rと前輪径Rとの大小関係を「r≦R」と規定した場合に、中心間距離Lと取付角度ψとを、図4中の斜線部に示すように、曲線LAと曲線LBとに囲まれた領域Ago内におけるLとψとの組合せとなるように構成することで、高さ20[mm]の上り段差の踏破が可能となる。
次に、図5に基づき、上り段差の高さHが補助輪16の下端に届かない高さの場合について説明する。
When the magnitude relationship between the auxiliary wheel diameter r and the front wheel diameter R is defined as “r ≦ R” from the relationship between the curves LA and LB, the distance L between the centers and the mounting angle ψ are indicated by the hatched portion in FIG. As shown in FIG. 5, by configuring the combination of L and ψ in the region Ago surrounded by the curve LA and the curve LB, it is possible to traverse an ascending step having a height of 20 [mm].
Next, based on FIG. 5, the case where the height H of the ascending step is not high enough to reach the lower end of the auxiliary wheel 16 will be described.

例えば、図5(a)に示すように、段差の高さHが、補助輪16を接地することが困難な程に低い段差40の場合、補助輪16を使用せずに段差40を踏破することが可能である。その一方で、例えば、図5(b)に示すように、段差の高さHが、補助輪16の下端位置にわずかに届かない程度の高さの段差45の場合、本実施形態の走行台車1のように操作部11を介して走行台車1を前方に押すことで走行させる構成では、前方に押されれば押される程、前輪14を段差45に押しつける力が働き、段差踏破を妨げる場合がある。このような場合でも、上式(7)〜(10)の条件を満たす構成とすることで、前方に押される力によって走行台車1がわずかに前方に傾くことで、補助輪16が段上に接地する。これにより、てこの原理によって、前輪14を容易に段上に持ち上げることが可能である。   For example, as shown in FIG. 5A, when the height H of the step is so low that it is difficult to ground the auxiliary wheel 16, the step 40 is broken without using the auxiliary wheel 16. It is possible. On the other hand, for example, as shown in FIG. 5 (b), when the height H of the step is a level difference 45 that does not reach the lower end position of the auxiliary wheel 16, the traveling carriage of the present embodiment. In the configuration in which the vehicle is driven by pushing the traveling carriage 1 forward via the operation unit 11 as in 1, the force that pushes the front wheel 14 against the step 45 works as the push is pushed forward, thereby obstructing stepping. There is. Even in such a case, the configuration satisfying the conditions of the above formulas (7) to (10) allows the traveling wheel 1 to be slightly tilted forward by the force pushed forward, so that the auxiliary wheels 16 are stepped up. Ground. Thus, the front wheel 14 can be easily lifted up by the lever principle.

次に、図6〜図7に基づき、上り段差の高さが補助輪16の下端よりも高い場合について説明する。
ここでは、図6に示すように、段差の高さHが補助輪16の下端位置よりも高くかつ中心位置よりも低い上り段差50について考える。なお、補助輪16の中心位置よりも高い段差については踏破の対象としないこととする。また、補助輪16に走行台車1の全質量がかかっていることとする。このような場合、下式(11)〜(12)の条件を満たすとき、補助輪16を段上に押し上げることが可能である。
Next, a case where the height of the ascending step is higher than the lower end of the auxiliary wheel 16 will be described with reference to FIGS.
Here, as shown in FIG. 6, an ascending step 50 in which the height H of the step is higher than the lower end position of the auxiliary wheel 16 and lower than the center position is considered. Note that steps higher than the center position of the auxiliary wheel 16 are not subject to traversal. Further, it is assumed that the total mass of the traveling carriage 1 is applied to the auxiliary wheel 16. In such a case, when the conditions of the following expressions (11) to (12) are satisfied, the auxiliary wheel 16 can be pushed up.

(r2−(L・sinψ+R−H)21/2・mg<(h−L・sinψ−R)・Fx−M0 …(11)
ここで、補助輪16の中心位置よりも段差の高さHは低いため下式(12)の条件を提示できる。
(R 2 − (L · sin ψ + R−H) 2 ) 1/2 · mg <(h−L · sin ψ−R) · Fx−M 0 (11)
Here, since the height H of the step is lower than the center position of the auxiliary wheel 16, the condition of the following expression (12) can be presented.

H<L・sinψ+R …(12)
ここでは、図4に示す曲線LA及びLBに囲まれた斜線領域Agoから決まるパラメータを用いて、力Fxと高さHとの関係を図7の曲線LCに示した。
具体的に、前輪径Rを50[mm]と決め、中心間距離Lを200[mm]、取付角度ψを5[deg]とする。また、これらのパラメータ値を用いて、段差50の高さHを20[mm]として、上式(9)より、計算によって補助輪径rを47[mm]と決める。
H <L · sinψ + R (12)
Here, the relationship between the force Fx and the height H is shown by a curve LC in FIG. 7 using parameters determined from the hatched area Ago surrounded by the curves LA and LB shown in FIG.
Specifically, the front wheel diameter R is determined to be 50 [mm], the center distance L is set to 200 [mm], and the mounting angle ψ is set to 5 [deg]. Further, using these parameter values, the height H of the step 50 is set to 20 [mm], and the auxiliary wheel diameter r is determined to be 47 [mm] by calculation from the above equation (9).

また、走行台車1の質量mが10[kg]、重力加速度gが9.8[m/s2]から、補助輪16にかかる力mgが約100[N]となる。また、把持部11aまでの地面からの高さhは1000[mm]とする。
なお、ここでの段差50の高さHは、20[mm]よりも高いものを考える。上式(12)の条件から、例えば、「20[mm]<H<67[mm]」の範囲とする。また、ここでも、モーメントの和M0は考慮しないこととする。なお、モーメントの和M0を考慮した場合、図7に示す曲線LCは上に移動する。
Further, since the mass m of the traveling carriage 1 is 10 [kg] and the gravitational acceleration g is 9.8 [m / s 2 ], the force mg applied to the auxiliary wheel 16 is about 100 [N]. In addition, the height h from the ground to the grip 11a is 1000 [mm].
Here, the height H of the step 50 is considered to be higher than 20 [mm]. From the condition of the above equation (12), for example, the range is “20 [mm] <H <67 [mm]”. Also here, the sum of moments M 0 is not considered. When the sum of moments M 0 is considered, the curve LC shown in FIG. 7 moves upward.

図7の曲線LCに示すように、67[mm]の段差50を踏破する場合でも力Fxが約5[N]となり、比較的小さな力Fxで補助輪16を段差50の段上に上げることが可能であることが解る。そして、補助輪16を段上に上げることができれば、てこの原理によって、前輪14が持ち上がり、段差50を容易に踏破することが可能となる。
以上のことから、上式(7)〜(12)に示す条件を満たす、補助輪径r、前輪径R、中心間距離L及び取付角度ψとなるように走行台車1を構成する。これによって、走行台車1を、地面から補助輪16の中心位置までの高さよりも低い段差高さの上り段差に対して、操作部11の力の入力点を力点、補助輪16の段上との接地点を支点としたてこの原理によって作用する力で前輪14を持ち上げて段差を踏破可能な構成とすることが可能となる。
As shown by the curve LC in FIG. 7, even when the step 50 of 67 [mm] is traversed, the force Fx becomes about 5 [N], and the auxiliary wheel 16 is raised to the step of the step 50 with a relatively small force Fx. Is understood to be possible. If the auxiliary wheel 16 can be raised up, the front wheel 14 can be lifted by the lever principle, and the step 50 can be easily traversed.
From the above, the traveling carriage 1 is configured so that the auxiliary wheel diameter r, the front wheel diameter R, the center distance L, and the mounting angle ψ satisfy the conditions shown in the above formulas (7) to (12). As a result, with respect to the ascending step having a step height that is lower than the height from the ground to the center position of the auxiliary wheel 16, the traveling carriage 1 has the input point of the force of the operation unit 11 as the power point and the step of the auxiliary wheel 16. Thus, the front wheel 14 can be lifted by a force acting according to this principle with the ground contact point as a fulcrum so that the step can be traversed.

(動作)
次に、図8〜図9に基づき、本実施形態の走行台車1の動作例を説明する。
平坦路において、操作者が操作部11の把持部11aを把持した状態で、把持部11aに走行台車1を前方に押す力を加えることで、走行台車1が前方に向かって走行する。
このとき、回転駆動機構19の力センサによって、前方に押す力が検出され、この検出値に基づきモータが駆動制御される。そして、前輪車軸13aを介して前輪14に走行台車1が前進する回転方向の補助トルクが付与される。これによって、操作者は、モータによるアシストの無い場合と比較して小さな力で走行台車1を走行させることが可能となる。
(Operation)
Next, based on FIGS. 8-9, the operation example of the traveling trolley | bogie 1 of this embodiment is demonstrated.
On a flat road, the traveling carriage 1 travels forward by applying a force pushing the traveling carriage 1 forward to the gripping section 11a while the operator grips the gripping section 11a of the operation section 11.
At this time, a force pushed forward is detected by the force sensor of the rotation drive mechanism 19, and the motor is driven and controlled based on the detected value. Then, auxiliary torque in the rotational direction in which the traveling carriage 1 moves forward is applied to the front wheels 14 via the front wheel axle 13a. As a result, the operator can run the traveling carriage 1 with a smaller force than in the case where there is no assist by the motor.

引き続き、走行台車1が前進走行を続け、図8(a)に示すように、上り段差30に到達したとする。上り段差30は、段差の高さHが、補助輪16の下端と段差上面とがちょうど接触する高さとなっているため、図8(a)に示すように、まず、補助輪16が段差30の段上に接地することになる。引き続き、走行台車1が前進することで、図8(b)に示すように、前輪14が段差30に接触する。ここでは、補助輪16及び前輪14と地面との摩擦係数が十分に高いとする。図8(b)に示す状態で、引き続き操作者が把持部11aに走行台車1を前方に押す力を加えることで、図8(c)に示すように、てこの原理によって、補助輪16の段上との接地点を支点として前輪14が地面から持ち上がり、段差30を乗り越える。段差30を乗り越えると、図8(d)に示すように、補助輪16が非接地の状態へと戻ると共に後輪18が接地の状態へと戻って安定した状態で走行台車1が前進する。   Next, it is assumed that the traveling cart 1 continues to travel forward and reaches the ascending step 30 as shown in FIG. In the ascending step 30, since the height H of the step is such that the lower end of the auxiliary wheel 16 and the upper surface of the step are just in contact with each other, as shown in FIG. It will be grounded on the stage. Subsequently, as the traveling carriage 1 moves forward, the front wheels 14 come into contact with the step 30 as shown in FIG. Here, it is assumed that the friction coefficient between the auxiliary wheel 16 and the front wheel 14 and the ground is sufficiently high. In the state shown in FIG. 8 (b), the operator continues to apply a force to push the traveling carriage 1 forward to the gripping part 11a, and as shown in FIG. The front wheel 14 is lifted from the ground with the contact point with the step as a fulcrum and gets over the step 30. When the vehicle goes over the step 30, as shown in FIG. 8D, the auxiliary wheel 16 returns to the non-grounded state and the rear wheel 18 returns to the grounded state, and the traveling carriage 1 moves forward in a stable state.

続いて、走行台車1が、平坦路を前進走行して、図9(a)に示すように、上り段差50に到達したとする。上り段差50は、段差の高さHが、補助輪16の下端位置よりも高く中心位置よりも低い高さとなっているため、図9(a)に示すように、まず、補助輪16の中心位置よりも低い部分が段差50の段部に接触することになる。引き続き操作者が把持部11aに走行台車1を前方に押す力を加えることで、図9(b)に示すように、補助輪16が段上に乗り上げる。そして、補助輪16が段上を前進し、前輪14が段差50に接触する。この状態で、引き続き、操作者が把持部11aに走行台車1を前方に押す力を加えることで、図9(c)に示すように、てこの原理によって、補助輪16の段上との接地点を支点として前輪14が持ち上がり、段差50を乗り越える。段差50を乗り越えると、図9(d)に示すように、補助輪16が非接地の状態へと戻ると共に後輪18が接地の状態へと戻って安定した状態で走行台車1が前進する。   Subsequently, it is assumed that the traveling carriage 1 travels forward on a flat road and reaches the ascending step 50 as shown in FIG. Since the height H of the step in the ascending step 50 is higher than the lower end position of the auxiliary wheel 16 and lower than the center position, first, as shown in FIG. A portion lower than the position comes into contact with the step portion of the step 50. The operator continuously applies a force to push the traveling carriage 1 forward to the grip portion 11a, so that the auxiliary wheels 16 ride on the step as shown in FIG. 9B. Then, the auxiliary wheel 16 moves forward on the step, and the front wheel 14 contacts the step 50. In this state, the operator continues to apply force to push the traveling carriage 1 forward to the gripping part 11a, and as shown in FIG. Using the point as a fulcrum, the front wheel 14 is lifted and gets over the step 50. When the vehicle goes over the step 50, as shown in FIG. 9D, the auxiliary wheel 16 returns to the non-grounded state and the rear wheel 18 returns to the grounded state, and the traveling carriage 1 moves forward in a stable state.

以上、本実施形態の走行台車1は、前輪径R、補助輪径r、前輪14と補助輪16との中心間距離L及び前輪14に対する補助輪16の取付角度ψを、上式(7)〜(12)にて提示される条件を満たす設計値(寸法及び角度)となるように構成した。
これにより、把持部11aへの走行台車1を前方へ押す力の入力点を力点、補助輪16の上り段差との接触点を支点としたてこの原理によって、前輪14を持ち上げる力の作用点に対して、前輪14を上り段差を乗り越える高さ位置へと持ち上げる力を作用させることが可能となる。
As described above, the traveling vehicle 1 of the present embodiment has the front wheel diameter R, the auxiliary wheel diameter r, the center distance L between the front wheel 14 and the auxiliary wheel 16 and the mounting angle ψ of the auxiliary wheel 16 with respect to the front wheel 14 in the above equation (7). It was comprised so that it might become a design value (a dimension and an angle) which satisfy | fills the conditions presented in (12).
As a result, the action point of the force that lifts the front wheel 14 by the lever principle with the input point of the force that pushes the traveling carriage 1 forward to the gripping part 11a as the fulcrum and the contact point with the ascending step of the auxiliary wheel 16 as a fulcrum. On the other hand, it is possible to apply a force that lifts the front wheel 14 to a height position over an ascending step.

その結果、補助輪16の中心位置よりも低い上り段差について、操作者が、特段大きな力を加えることなくかつ段差を意識することなく、通常通りに走行台車1を前進走行させるための力を把持部11aに加えることで、走行台車1に、容易に段差を乗り越えさせることが可能となる。   As a result, the operator grasps the force required for the traveling carriage 1 to travel forward in the normal manner without applying a particularly large force and without being aware of the step for an ascending step lower than the center position of the auxiliary wheel 16. By adding to the portion 11a, the traveling carriage 1 can easily get over the step.

(実施例)
次に、上記実施形態の式(7)〜(12)を満たす設計値で設計された走行台車1(試験機)を用いた実施例について説明する。
試験機の各パラメータは、補助輪径rが47[mm]、前輪径Rが50[mm]、中心間距離Lが200[mm]、取付角度ψが5[deg]となっている。また、踏破対象の上り段差の高さHは20[mm]で、補助輪16の下端にちょうど接触する高さとした。
把持部11aにばね測りをひっかけて、前方から引き、段差踏破したときの力Fxを計測したところ、「Fx=18.5[N]」となった。図7に示す曲線LCの値と比較して大きな値となったが、これは、モーメントの和M0を考慮していないためと考える。しかし、上記実施形態で述べたように、高齢者の押す力は平均60[N]程度であることから、十分小さな値であるといえる。
(Example)
Next, examples using the traveling carriage 1 (test machine) designed with design values satisfying the expressions (7) to (12) of the above embodiment will be described.
The parameters of the test machine are: auxiliary wheel diameter r is 47 [mm], front wheel diameter R is 50 [mm], center-to-center distance L is 200 [mm], and mounting angle ψ is 5 [deg]. Further, the height H of the ascending step to be traversed was 20 [mm], and the height just touched the lower end of the auxiliary wheel 16.
When the force Fx when the gripping part 11a was hooked with a spring and pulled from the front and stepped over the step was measured, the result was “Fx = 18.5 [N]”. Although the value is larger than the value of the curve LC shown in FIG. 7, it is considered that the sum of moments M 0 is not taken into consideration. However, as described in the above embodiment, since the pressing force of the elderly is about 60 [N] on average, it can be said that the value is sufficiently small.

一方、補助輪16を設けていない構成の試験機で同様の測定を行ったところ、力Fxが21[N]を超えても段差踏破ができなかった。なお、これ以上力を加えると、本体が傾き、姿勢が崩れ、転倒の危険があったため計測を終了した。
以上のことから、上記実施形態の式(7)〜(12)を満たす設計値で走行台車1を構成することで、段差踏破を容易にすることを確認した。
On the other hand, when the same measurement was performed with a testing machine having a configuration in which the auxiliary wheel 16 was not provided, even when the force Fx exceeded 21 [N], the step could not be stepped over. When more force was applied, the body was tilted, the posture collapsed, and there was a risk of falling, so the measurement was terminated.
From the above, it was confirmed that stepping over the steps was facilitated by configuring the traveling carriage 1 with the design values satisfying the expressions (7) to (12) of the above embodiment.

(変形例)
(1)上記実施形態では、上式(7)〜(12)の条件を全て満たす構成としたが、この構成に限らない。例えば、上式(7)〜(8)の条件を満たす構成、上式(7)〜(9)の条件を満たす構成など他の構成としてもよい。
(2)上記実施形態では、前輪14の回転力をアシストする回転駆動機構19を備える構成としたが、この構成に限らず、回転駆動機構19を備えない構成としてもよい。
(Modification)
(1) In the above embodiment, the configuration satisfies all the conditions of the above formulas (7) to (12). However, the configuration is not limited to this. For example, other configurations such as a configuration satisfying the above formulas (7) to (8) and a configuration satisfying the above formulas (7) to (9) may be adopted.
(2) In the above embodiment, the rotation drive mechanism 19 that assists the rotational force of the front wheel 14 is provided. However, the present invention is not limited to this configuration, and the rotation drive mechanism 19 may not be provided.

(3)上記実施形態では、高齢者の歩行補助を行うことを考慮した構成(シルバーカー)を例に挙げて説明したが、この構成に限らず、ベビーカーや荷物運搬用の台車など、他の用途への適用も可能である。
また、上記実施形態は、本発明の好適な具体例であり、技術的に好ましい種々の限定が付されているが、本発明の範囲は、上記の説明において特に本発明を限定する旨の記載がない限り、これらの形態に限られるものではない。また、上記の説明で用いる図面は、図示の便宜上、部材ないし部分の縦横の縮尺は実際のものとは異なる模式図である。
また、本発明は上記実施形態に限定されるものではなく、本発明の目的を達成できる範囲での変形、改良等は本発明に含まれるものである。
(3) In the above embodiment, the configuration (silver car) that considers elderly people walking assistance has been described as an example. However, the present invention is not limited to this configuration, and other configurations such as a stroller and a cart for carrying luggage are used. Application to usage is also possible.
The above embodiments are preferable specific examples of the present invention, and various technically preferable limitations are given. However, the scope of the present invention is described in particular in the above description to limit the present invention. As long as there is no, it is not restricted to these forms. In the drawings used in the above description, for convenience of illustration, the vertical and horizontal scales of members or parts are schematic views different from actual ones.
Further, the present invention is not limited to the above-described embodiment, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.

1…走行台車、10…基体、11…操作部、11a…把持部、11b…ポール部、12…旋回機構、13…前輪支持部、13a…前輪車軸、14…前輪、15…補助輪支持部、16…補助輪、17…後輪支持部、18…後輪、19…回転駆動機構、30,40,45,50…上り段差、r…補助輪径、R…前輪径、L…中心間距離、ψ…取付角度 DESCRIPTION OF SYMBOLS 1 ... Traveling trolley, 10 ... Base | substrate, 11 ... Operation part, 11a ... Holding part, 11b ... Pole part, 12 ... Turning mechanism, 13 ... Front wheel support part, 13a ... Front wheel axle, 14 ... Front wheel, 15 ... Auxiliary wheel support part , 16 ... auxiliary wheel, 17 ... rear wheel support, 18 ... rear wheel, 19 ... rotational drive mechanism, 30, 40, 45, 50 ... ascending step, r ... auxiliary wheel diameter, R ... front wheel diameter, L ... center-to-center Distance, ψ ... Mounting angle

Claims (5)

基体と、
前記基体の下部に回転自在に支持された走行輪と、
前記基体の前記走行輪よりも前方側に回転自在に支持され、かつ、前記走行輪によって平坦路を走行時に非接地となる高さ位置に設けられた補助輪と、
前記基体の上部に設けられ、操作者が前記基体を前記走行輪によって走行させる力を入力可能な操作部と、を備え、
前記操作部の前記力の入力点を力点とし、かつ前記補助輪の上り段差の上面との接地点を支点としたてこの原理によって、前記基体を前進走行させる力を前記力点に入力したときに、前記走行輪を前記上り段差を乗り越え可能な高さ位置まで持ち上げる力が作用するように、前記走行輪の半径、前記補助輪の半径、前記補助輪と前記走行輪との中心間距離及び前記走行輪に対する前記補助輪の取付角度が構成されていることを特徴とする走行台車。
A substrate;
A traveling wheel rotatably supported at a lower portion of the base body;
An auxiliary wheel that is rotatably supported on the front side of the traveling wheel of the base body and provided at a height position that is ungrounded when traveling on a flat road by the traveling wheel;
An operation unit provided on an upper part of the base body and capable of inputting a force by which an operator travels the base body with the traveling wheels;
When the force input point of the operation portion is used as a power point and the ground contact point with the upper surface of the ascending step of the auxiliary wheel is used as a fulcrum, when a force that causes the base to travel forward is input to the force point. A radius of the traveling wheel, a radius of the auxiliary wheel, a distance between centers of the auxiliary wheel and the traveling wheel, and a force that lifts the traveling wheel up to a height position where the traveling wheel can be overcome A traveling cart characterized in that an angle of attachment of the auxiliary wheel to a traveling wheel is configured.
前記走行輪は、前記基体の前方側に設けられた前輪と、前記基体の後方側に設けられた後輪とを含み、
前記前輪の半径をR、前記補助輪の半径をr、前記中心間距離をL、前記取付角度をψ、前記前輪の接地点と前記補助輪の接地点との間の距離をL’、前記基体の質量と重力とによって前記前輪にかかる力をmg、前記力点に入力される前記基体を前進走行させる水平方向の力をFx、前記上り段差の高さをH、前記走行輪の接地面から前記力点までの高さをh、前記基体の重心と前記後輪とにかかる力によるモーメントの和をM0として、
下式(1)〜(3)を満たす寸法及び角度に、前記走行輪の半径、前記補助輪の半径、前記中心間距離及び前記取付角度が構成されていることを特徴とする請求項1に記載の走行台車。
L’・mg・cosψ<Fx・h−M0 …(1)
L’=((Lcosψ)2+H21/2 …(2)
r=L・sinψ+R−H …(3)
The traveling wheel includes a front wheel provided on the front side of the base body and a rear wheel provided on the rear side of the base body,
The radius of the front wheel is R, the radius of the auxiliary wheel is r, the center-to-center distance is L, the mounting angle is ψ, the distance between the front wheel ground point and the auxiliary wheel ground point is L ′, The force applied to the front wheel due to the mass and gravity of the base body is mg, the horizontal force that moves forward the base body that is input to the power point is Fx, the height of the ascending step is H, and the ground contact surface of the traveling wheel is The height to the force point is h, and the sum of moments due to the force applied to the center of gravity of the base and the rear wheel is M 0 .
The radius and the radius of the traveling wheel, the radius of the auxiliary wheel, the center-to-center distance, and the mounting angle are configured so as to satisfy the following formulas (1) to (3). The traveling cart described.
L ′ · mg · cos ψ <Fx · h−M 0 (1)
L ′ = ((L cos ψ) 2 + H 2 ) 1/2 (2)
r = L · sinψ + R−H (3)
前記前輪の半径Rを前記補助輪の半径r以上の大きさの寸法に構成し、前記中心間距離L及び前記取付角度ψを、下式(4)を満たす寸法及び角度に構成したことを特徴とする請求項2に記載の走行台車。
0<L<H/sinψ …(4)
The radius R of the front wheel is configured to have a size larger than the radius r of the auxiliary wheel, and the center-to-center distance L and the mounting angle ψ are configured to have a size and an angle satisfying the following expression (4). The traveling vehicle according to claim 2.
0 <L <H / sinψ (4)
前記力mgが前記補助輪にかかるとして、下式(5)及び(6)を満たす寸法及び角度に、前記走行輪の半径、前記補助輪の半径、前記中心間距離及び前記取付角度が構成されていることを特徴とする請求項3に記載の走行台車。
(r2−(L・sinψ+R−H)21/2・mg<(h−L・sinψ−R)・Fx−M0 …(5)
H<L・sinψ+R …(6)
Assuming that the force mg is applied to the auxiliary wheel, the radius of the traveling wheel, the radius of the auxiliary wheel, the distance between the centers, and the mounting angle are configured to satisfy the following expressions (5) and (6). The traveling vehicle according to claim 3, wherein
(R 2 − (L · sin ψ + R−H) 2 ) 1/2 · mg <(h−L · sin ψ−R) · Fx−M 0 (5)
H <L · sinψ + R (6)
前記前輪をアクチュエータによって回転駆動する回転駆動機構を備えることを特徴とする請求項2乃至4のいずれか1項に記載の走行台車。   The traveling carriage according to any one of claims 2 to 4, further comprising a rotation drive mechanism that rotationally drives the front wheels by an actuator.
JP2014158670A 2014-08-04 2014-08-04 Traveling carriage Pending JP2016034809A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2014158670A JP2016034809A (en) 2014-08-04 2014-08-04 Traveling carriage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2014158670A JP2016034809A (en) 2014-08-04 2014-08-04 Traveling carriage

Publications (1)

Publication Number Publication Date
JP2016034809A true JP2016034809A (en) 2016-03-17

Family

ID=55522985

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2014158670A Pending JP2016034809A (en) 2014-08-04 2014-08-04 Traveling carriage

Country Status (1)

Country Link
JP (1) JP2016034809A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109380827A (en) * 2017-08-10 2019-02-26 本田技研工业株式会社 The control method of device of walking aid and device of walking aid
JP2019033819A (en) * 2017-08-10 2019-03-07 本田技研工業株式会社 Walking support device
JP2019033818A (en) * 2017-08-10 2019-03-07 本田技研工業株式会社 Control method of walking support device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH077624U (en) * 1993-07-14 1995-02-03 信夫 鳥巣 Wheelchair caster climbing device
JP2005029015A (en) * 2003-07-14 2005-02-03 Kazuaki Usami Carrier with auxiliary caster
JP2012071817A (en) * 2011-04-25 2012-04-12 Mitsuba Corp Hand-push electric handy cart

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH077624U (en) * 1993-07-14 1995-02-03 信夫 鳥巣 Wheelchair caster climbing device
JP2005029015A (en) * 2003-07-14 2005-02-03 Kazuaki Usami Carrier with auxiliary caster
JP2012071817A (en) * 2011-04-25 2012-04-12 Mitsuba Corp Hand-push electric handy cart

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109380827A (en) * 2017-08-10 2019-02-26 本田技研工业株式会社 The control method of device of walking aid and device of walking aid
JP2019033819A (en) * 2017-08-10 2019-03-07 本田技研工業株式会社 Walking support device
JP2019033818A (en) * 2017-08-10 2019-03-07 本田技研工業株式会社 Control method of walking support device
US10667978B2 (en) 2017-08-10 2020-06-02 Honda Motor Co., Ltd. Walking assist device and method of controlling walking assist device

Similar Documents

Publication Publication Date Title
US11577573B2 (en) System and method for traversing vertical obstacles
US11572117B2 (en) Obstacle traversing mobile robot
US7783392B2 (en) Traveling apparatus and method of controlling the same
WO2018145500A1 (en) Self-balancing vehicle device and corresponding control method therefor
JP6164300B2 (en) Wheelbarrow
JP2008229329A (en) Vehicle for transporting wheelchair
JP2009526703A (en) Suspension device
JP2016034809A (en) Traveling carriage
JP2007223399A (en) Vehicle
JP2014218183A (en) Wheel support structure of traveling truck
JP2010215043A (en) Electric assisting cart
US20210070294A1 (en) Brake-steering apparatus for controlling autonomous navigation of an electric scooter
KR20150042434A (en) Motor-driven Cart
US20170056260A1 (en) Caster wheel arrangement
JP4495444B2 (en) Power assist type moving body
JP4779683B2 (en) Automated guided vehicle
JP3131612U (en) Two-wheeled vehicle with hand-held handle
JP6349616B1 (en) Manual traveling vehicle
JP2016117378A (en) Transportation vehicle
JP2016117379A (en) Control device of transport vehicle
JP3660349B2 (en) Wheelchair attitude control device
KR101640431B1 (en) Front and rear-wheel drive type safty bicycle
CN110573400A (en) Track and track running system
JP6815572B1 (en) Control device for electric power steering device and electric power steering device
JP2008094216A (en) Escalator cart

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20170427

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20180221

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20180227

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20180911