JPH067B2 - 4WS Garden Tractor - Google Patents

4WS Garden Tractor

Info

Publication number
JPH067B2
JPH067B2 JP3559688A JP3559688A JPH067B2 JP H067 B2 JPH067 B2 JP H067B2 JP 3559688 A JP3559688 A JP 3559688A JP 3559688 A JP3559688 A JP 3559688A JP H067 B2 JPH067 B2 JP H067B2
Authority
JP
Japan
Prior art keywords
wheels
wheel
tractor
mower
turning
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.)
Expired - Fee Related
Application number
JP3559688A
Other languages
Japanese (ja)
Other versions
JPH01211419A (en
Inventor
和夫 鮫島
毅 佐藤
輝郎 島村
俊彦 浜田
弘典 土橋
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.)
Kubota Corp
Original Assignee
Kubota Corp
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 Kubota Corp filed Critical Kubota Corp
Priority to JP3559688A priority Critical patent/JPH067B2/en
Priority to US07/309,519 priority patent/US4977733A/en
Publication of JPH01211419A publication Critical patent/JPH01211419A/en
Publication of JPH067B2 publication Critical patent/JPH067B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D7/00—Steering linkage; Stub axles or their mountings
    • B62D7/06—Steering linkage; Stub axles or their mountings for individually-pivoted wheels, e.g. on king-pins
    • B62D7/14—Steering linkage; Stub axles or their mountings for individually-pivoted wheels, e.g. on king-pins the pivotal axes being situated in more than one plane transverse to the longitudinal centre line of the vehicle, e.g. all-wheel steering
    • B62D7/142—Steering linkage; Stub axles or their mountings for individually-pivoted wheels, e.g. on king-pins the pivotal axes being situated in more than one plane transverse to the longitudinal centre line of the vehicle, e.g. all-wheel steering specially adapted for particular vehicles, e.g. tractors, carts, earth-moving vehicles, trucks

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、庭園の芝刈り等に使用される４ＷＳガーデン
トラクタに関する。TECHNICAL FIELD The present invention relates to a 4WS garden tractor used for lawn mowing in a garden and the like.

〔従来の技術〕[Conventional technology]

トラクタにモーアを装着して芝刈り等を行うものとし
て、例えば、実公昭６１−３７２１８号公報に記載のも
のが公知である。For example, the one described in Japanese Utility Model Publication No. 61-37218 is known as a mower mounted on a tractor to perform lawn mowing.

この従来のものは、前輪が操向輪とされ、かつ前輪及び
後輪が駆動輪とされた４ＷＤトラクタの前輪と後輪間の
車体下部にモーアを装着したものであった。そして、こ
のモーアの前部及び後部の左右両側にゲージ輪（接地
輪）が設けられていた。このゲージ輪は、モーアで芝を
刈るときの刈高さを調整するものである。そして、後部
のゲージ輪はキャスタ式とされ、トラクタの操向に自然
に追従するよう構成されていた。In this conventional vehicle, a mower is attached to a lower portion of a vehicle body between a front wheel and a rear wheel of a 4WD tractor in which front wheels are steered wheels and front wheels and rear wheels are drive wheels. Gauge wheels (ground wheels) are provided on the left and right sides of the front and rear of the mower. This gauge wheel adjusts the cutting height when cutting grass with mower. The gauge wheel at the rear is caster type, and is configured to naturally follow the steering of the tractor.

〔発明が解決しようとする課題〕[Problems to be Solved by the Invention]

前記従来のトラクタは、前輪のみが操向輪とされていた
為、その旋回半径が大きく、小さな庭園等では使用しに
くいものであった。Since only the front wheels of the conventional tractor are steering wheels, the tractor has a large turning radius and is difficult to use in a small garden or the like.

そこで、前輪と後輪が共に操向輪とされた４ＷＳトラク
タにモーアを装着し、小さな旋回半径で芝刈できるよう
にすることが考えられる。また、旋回することなく前後
進を繰り返して芝を刈ることが考えられる。Therefore, it is conceivable to attach a mower to a 4WS tractor in which both front wheels and rear wheels are steered wheels so that lawn mowing can be performed with a small turning radius. It is also possible to mow the grass by repeating forward and backward movements without turning.

ところで、前後進を繰り返えすと、モーアのキャスタ式
ゲージ輪が、前進から後進、または後進から前進に移る
とき180゜回転することになり、芝をいためたり、地面を
掘ったりすると云う問題が生じた。By the way, if you move forward and backward repeatedly, the caster type gauge wheel of Moor will rotate 180 ° when moving from forward to reverse or from reverse to forward, which causes problems such as turfing grass and digging the ground. occured.

そこで、ゲージ輪を固定式にすると、今度は、４ＷＳト
ラクタの小旋回時にゲージ輪が充分追従できず、横すべ
りして芝をいためると云う問題が生じた。Therefore, if the gauge wheel is fixed, this time, when the 4WS tractor makes a small turn, the gauge wheel cannot sufficiently follow, causing a problem of side slipping and damaging the turf.

即ち、第６図に示すように、４ＷＳトラクタでは、その
旋回中心６０は、前輪６１と後輪６２との略中央位置に
あり（例えば、「新編・自動車工学ハンドブック」、社
団法人 自動車技術会編、発行所 （株） 図書出版
社．１９８１年５月２５日第８版発行．第８−１頁参
照）、従って、モーア６３の後部ゲージ輪６４は、旋回
中心６０から遠く離れた位置にあり、特に旋回内側の固
定式ゲージ輪６４がトラクタの旋回軌跡に追従しにくい
と云う問題があった。That is, as shown in FIG. 6, in the 4WS tractor, the turning center 60 is located at a substantially central position between the front wheel 61 and the rear wheel 62 (see, for example, "New Edition-Automotive Engineering Handbook", Japan Society of Automotive Engineers). , Publisher, Inc. Book Publisher. Issued May 25, 1981, 8th edition. See page 8-1). Therefore, the rear gauge wheel 64 of the mower 63 is located far from the turning center 60. In particular, there is a problem in that the fixed gauge wheel 64 on the inside of the turn does not easily follow the turning trajectory of the tractor.

そこで、本発明は、トラクタを前後進させてもゲージ輪
で芝をいためず、かつ、小旋回してもゲージ輪で芝をい
ためない４ＷＳガーデントラクタを提供することを目的
とする。Therefore, an object of the present invention is to provide a 4WS garden tractor that does not hesitate the lawn with the gauge wheel even when the tractor is moved forward and backward, and does not heal the lawn with the gauge wheel even when making a small turn.

〔課題を解決するための手段〕[Means for Solving the Problems]

前記目的を達成するため、本発明は、次の手段を講じ
た。即ち、本発明の特徴とする処は、前輪及び後輪が操
向輪とされ、かつ、前後輪間の車体下部にモーアが装着
され、該モーアの後部の左右両側に接地輪が設けられた
４ＷＳガーデントラクタにおいて、 前記前後輪の旋回中心位置を、前後輪間の中央位置より
も後方で、かつ、モーアの接地輪近傍に設定した点にあ
る。In order to achieve the above-mentioned object, the present invention takes the following means. That is, the feature of the present invention is that the front wheels and the rear wheels are steering wheels, the mower is attached to the lower part of the vehicle body between the front and rear wheels, and the ground wheels are provided on the left and right sides of the rear part of the mower. In the 4WS garden tractor, the turning center position of the front and rear wheels is set behind the center position between the front and rear wheels and in the vicinity of the grounding wheel of the mower.

〔作用〕[Action]

本発明によれば、トラクタが小旋回するとき、モーアの
後部の左右一対の接地輪の内、旋回中心側の接地輪は、
旋回中心近傍に位置することになり、該接地輪の移動は
極小となるので、芝をいためることがなくなる。According to the present invention, when the tractor makes a small turn, of the pair of left and right ground wheels at the rear of the mower, the ground wheel on the turning center side is
Since it is located in the vicinity of the turning center and the movement of the grounding wheel is minimized, the grass is not damaged.

また、旋回外側の接地輪は、その旋回半径が大きい為、
横すべりは小さく、芝をいためることがない。Also, since the grounding wheel on the outside of the turn has a large turning radius,
The sideslip is small and does not damage the grass.

〔実施例〕〔Example〕

以下、本発明の実施例を図面に基づき説明する。 Embodiments of the present invention will be described below with reference to the drawings.

第１図及び第２図において、１は４ＷＳトラクタであ
り、その前輪２及び後輪３は操向輪とされている。即
ち、ハンドル４を回動することにより、前・後輪２，３
が第１図に示すように方向変換するよう構成されてい
る。In FIGS. 1 and 2, 1 is a 4WS tractor, and its front wheels 2 and rear wheels 3 are steering wheels. That is, by rotating the handle 4, the front and rear wheels 2, 3
Are configured to change direction as shown in FIG.

前記トラクタ１の前輪２と後輪３間の車体５の下部モー
ア６が上下動自在に装着されている。モーア６の上面中
央部には動力受入装置７が設けられ、該動力受入装置７
とトラクタ１とは伝動軸８で連結され、モーア６の刈刃
９を回転駆動するよう構成されている。A lower mower 6 of a vehicle body 5 between a front wheel 2 and a rear wheel 3 of the tractor 1 is mounted so as to be vertically movable. A power receiving device 7 is provided at the center of the upper surface of the mower 6, and the power receiving device 7 is provided.
The tractor 1 and the tractor 1 are connected by a transmission shaft 8 and are configured to drive the cutting blade 9 of the mower 6 to rotate.

第１図に示すように、モーア６の左右方向の中心線１０
と、車体５の中心線１１とは若干ずれており、モーア６
の左右方向両端部の内、車体側に入り込んだ側の端部が
刈草放出口１２とされている。また、モーア６の前後方
向の中心線１３と前後輪２，３間の前後方向中心線１３
とは略一致している。As shown in FIG. 1, the lateral center line 10 of the mower 6
Is slightly deviated from the center line 11 of the vehicle body 5, and the mower 6
Of the both ends in the left-right direction, the end on the side that enters the vehicle body side is the grass cutting outlet 12. Further, the front-rear centerline 13 of the mower 6 and the front-rear centerline 13 between the front-rear wheels 2, 3 are arranged.
Is almost the same as.

前記モーア６の前部中央部に前部接地輪１４が設けら
れ、また後部の左右両側に後部接地輪１５が設けられて
いる。これらの接地輪１４，１５はキャスタ式ではなく
固定式とされている。後部接地輪１５は後輪３よりも左
右方向外方に配置されている。A front grounding wheel 14 is provided at the center of the front part of the mower 6, and rear grounding wheels 15 are provided on the left and right sides of the rear part. These ground wheels 14 and 15 are fixed type instead of caster type. The rear ground wheel 15 is arranged outward of the rear wheel 3 in the left-right direction.

そして、前記トラクタ１の前輪２及び後輪３の操向装置
（図示省略）は、最小旋回時のとき、その旋回中心１６
が、後部接地輪１５の近傍に位置するよう構成されてい
る。The steering device (not shown) for the front wheels 2 and the rear wheels 3 of the tractor 1 has a turning center 16 at the minimum turning time.
Is configured to be located in the vicinity of the rear ground wheel 15.

即ち、最小旋回時の旋回中心１６は、前後方向の中心線
１３よりもｌ１だけ後方で、かつ、後部接地輪１５の中
心から前後方向にｌ２だけ離れ、左右方向にｌ３だけ離
れた位置に位置している。勿論、このｌ２、ｌ３は可及
的に零になるのが望ましい。That is, the turning center 16 at the time of the minimum turning is behind the center line 13 in the front-rear direction by l 1 , and is separated from the center of the rear grounding wheel 15 in the front-rear direction by l 2 and in the left-right direction by l 3 . Located in position. Of course, it is desirable that these l 2 and l 3 become zero as much as possible.

前記本発明の実施例によれば、モーア６の接地輪１４，
１５はキャスタ式ではなく固定式とされているので、ト
ラクタ１を前進から後進またはその逆にした場合でも、
接地輪１４，１５がキャスタ式のように180゜方向転換を
することがないので芝をいためない。According to the embodiment of the present invention, the ground wheel 14 of the mower 6 is
Since 15 is a fixed type instead of a caster type, even when the tractor 1 is moved from forward to reverse or vice versa,
Since the grounding wheels 14 and 15 do not change the direction by 180 ° like the caster type, the grass is not damaged.

また、トラクタ１を最小旋回半径で旋回させる場合、旋
回内側の後部接地輪１５は、旋回中心１６近傍に位置し
ているので、その横すべりは小さく、芝をいためない。
旋回中心１６から離れた接地輪１５は、その旋回半径が
比較的大きいため、横すべりによる芝いためは問題にな
らない。Further, when the tractor 1 is turned with the minimum turning radius, the rear grounding wheel 15 on the inside of the turning is located in the vicinity of the turning center 16, so that the side slip is small and the grass is not damaged.
Since the turning radius of the grounding wheel 15 separated from the turning center 16 is relatively large, it does not cause a problem due to turf caused by skidding.

第３図及び第４図に示すものは、後部接地輪１５を約10
゜の範囲で揺動できるように取付けたものである。As shown in FIGS. 3 and 4, the rear ground wheel 15 has about 10
It is mounted so that it can swing in the range of °.

即ち、モーア側の固定軸１７にキャスタ部１８が回動自
在に設けられ、このキャスタ部１８に長孔１９が形成さ
れ、この長孔１９に、固定軸１７に突設されたピン２０
が挿通されている。従って、キャスタ部１８は長孔１９
の範囲で回動するものであり、この回動範囲は、直進状
態から旋回側に約10゜の範囲とされている。That is, the caster portion 18 is rotatably provided on the mower-side fixed shaft 17, a long hole 19 is formed in the caster portion 18, and a pin 20 protruding from the fixed shaft 17 is formed in the long hole 19.
Has been inserted. Therefore, the caster portion 18 has the long hole 19
The rotation range is about 10 ° from the straight traveling state to the turning side.

この様に後部接地輪１５を約10゜回動可能に設けること
により、旋回中心１６と後部接地輪１５とが若干ずれた
場合でも、後部接地輪１５が旋回軌跡を追従しやすくし
ている。By providing the rear grounding wheel 15 so as to be rotatable about 10 °, the rear grounding wheel 15 can easily follow the turning trajectory even if the turning center 16 and the rear grounding wheel 15 are slightly deviated from each other.

そして、後部接地輪１５の回動範囲を約10゜としたの
は、前進から後進またはその逆に移る場合、10゜以上で
あると、接地輪１５の傾きが大きくなりすぎて芝をいた
めるためである。10゜以下の場合は、芝をいためず、か
つ、旋回時の追従が充分となる。Further, the turning range of the rear grounding wheel 15 is set to about 10 °, because when the vehicle moves from forward to reverse or vice versa, if the angle is 10 ° or more, the inclination of the grounding wheel 15 becomes too large to heal the grass. Is. When the angle is 10 ° or less, the grass is not damaged and the follow-up when turning is sufficient.

第５図に示すものは、前記トラクタ１の駆動装置であ
り、前輪及び後輪が共に駆動輪とされた４ＷＤトラクタ
の駆動装置の一部である。FIG. 5 shows a drive device for the tractor 1, which is a part of a drive device for a 4WD tractor in which both front wheels and rear wheels are drive wheels.

四輪駆動の場合、エンジン動力は前輪及び後輪に同時に
伝達されるが、前記の如く、４ＷＳにおいて、その旋回
中心を後輪側に設定すると、旋回時、前輪側の旋回半径
は後輪側よりも大きくなり、前輪の移動軌跡は後輪より
も長くなる。In the case of four-wheel drive, the engine power is transmitted to the front wheels and the rear wheels at the same time. However, when the turning center is set to the rear wheel side in 4WS as described above, the turning radius on the front wheel side is the rear wheel side when turning. And the movement locus of the front wheels becomes longer than that of the rear wheels.

従って、旋回時は前輪の周速は後輪の周速よりも大きく
しなければならない。Therefore, when turning, the peripheral speed of the front wheels must be higher than the peripheral speed of the rear wheels.

従来、前後輪の周速を調整するために、前輪側の動力伝
達系路にワンウエイクラッチを介在し、エンジン側から
は動力を伝達するが車輪側からの動力は伝達しないよう
にし、前輪の周速が速くなると、後輪のみを駆動するよ
うにしていた。Conventionally, in order to adjust the peripheral speed of the front and rear wheels, a one-way clutch is interposed in the power transmission path of the front wheels to prevent power from being transmitted from the engine side but from the wheel side. When the speed increased, only the rear wheels were driven.

しかしながら、ワンウエイクラッチを介装すると、後進
のときは、後輪のみの駆動となる。また、前進のとき前
輪が泥や穴に落ちた場合、そこから脱出するためには、
車輪の回転を停止させた後急発進したり、一旦後退して
から前進したりしなければならないが、泥地だと抵抗が
少ないため、前輪の回転を止めようと思ってもワンウエ
イクラッチのため止まらず、前輪は惰性で回転し続け止
まらない。また後退させようとしても前輪には動力が伝
達されず、穴から脱出できないと云う問題があった。However, if the one-way clutch is installed, only the rear wheels are driven when the vehicle is moving backward. Also, if the front wheels fall into the mud or holes when moving forward, to escape from them,
You have to start suddenly after stopping the rotation of the wheels, or move backward and then forward, but in a muddy place there is little resistance, so even if you try to stop the rotation of the front wheels, it is a one-way clutch It does not stop, the front wheels continue to rotate due to inertia and do not stop. In addition, there was a problem that power could not be transmitted to the front wheels even when trying to move backward, and it was impossible to escape from the hole.

そこで、第５図に示すように、前輪入力軸２１とエンジ
ン動力軸２２間に、エンジン動力を前輪入力軸２１に伝
達するが、前輪入力軸２１からの動力は動力軸２２に伝
達しないワンウエイクラッチ２３を設け、かつ、ワンウ
エイクラッチ２３のケーシング２４と前輪入力軸２１と
を直結するシフトギヤ２５を前輪入力軸２１に摺動自在
に設けた。そして、このシフトギヤ２５の入・切操作
で、動力軸２２と前輪入力軸２１とを直結したり、ワン
ウエイクラッチ２３を介して連結したりするよう構成し
ている。Therefore, as shown in FIG. 5, a one-way clutch that transmits engine power between the front wheel input shaft 21 and the engine power shaft 22 to the front wheel input shaft 21 but does not transmit power from the front wheel input shaft 21 to the power shaft 22. 23, and a shift gear 25 that directly connects the casing 24 of the one-way clutch 23 and the front-wheel input shaft 21 is slidably provided on the front-wheel input shaft 21. The power shaft 22 and the front wheel input shaft 21 are directly connected to each other or are connected to each other via the one-way clutch 23 when the shift gear 25 is turned on and off.

尚、ケーシング２４と動力軸２２とはギヤ２６，２７を
介して噛合し、前輪入力軸２１はベベルギヤ２８，２９
を介してスリーブ軸３０に連結され、スリーブ軸３０に
デファレンシャル装置３１が設けられ、該デファレンシ
ャル装置３１から前車軸３２が延出している。The casing 24 and the power shaft 22 mesh with each other via gears 26 and 27, and the front wheel input shaft 21 includes the bevel gears 28 and 29.
Is connected to the sleeve shaft 30 via a shaft, a differential device 31 is provided on the sleeve shaft 30, and a front axle 32 extends from the differential device 31.

〔発明の効果〕〔The invention's effect〕

本発明によれば、４ＷＳトラクタにおいて旋回半径を小
さくしても芝をいためることがなく、きれいに芝を刈る
ことができる。According to the present invention, lawn can be cut cleanly without damaging the lawn even if the turning radius is reduced in the 4WS tractor.

【図面の簡単な説明】[Brief description of drawings]

第１図は本発明の実施例を示す要部平面図、第２図は４
ＷＳガーデントラクタの全体を示す側面図、第３図は後
部接地輪を示す平面図、第４図は同側面図、第５図は駆
動装置の一部を示す断面図、第６図は従来例を示す平面
図である。 １…トラクタ、２…前輪、３…後輪、６…モーア、１５
…接地輪、１６…旋回中心。FIG. 1 is a plan view of an essential part showing an embodiment of the present invention, and FIG.
FIG. 3 is a side view showing the entire WS garden tractor, FIG. 3 is a plan view showing the rear grounding wheel, FIG. 4 is the same side view, FIG. 5 is a sectional view showing a part of the drive device, and FIG. 6 is a conventional example. FIG. 1 ... tractor, 2 ... front wheel, 3 ... rear wheel, 6 ... mower, 15
… Grounding wheel, 16… Center of turning.

───────────────────────────────────────────────────── フロントページの続き (72)発明者 浜田 俊彦 大阪府堺市石津北町64番地 久保田鉄工株 式会社堺製造所内 (72)発明者 土橋 弘典 大阪府堺市石津北町64番地 久保田鉄工株 式会社堺製造所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshihiko Hamada 64 Ishizukita-machi, Sakai City, Osaka Prefecture Kubota Iron Works Co., Ltd.Sakai Factory Sakai Factory

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】前輪及び後輪が操向輪とされ、かつ、前後
輪間の車体下部にモーアが装着され、該モーアの後部の
左右両側に接地輪が設けられた４ＷＳガーデントラクタ
において、 前記前後輪の旋回中心位置を、前後輪間の中央位置より
も後方で、かつ、モーアの接地輪近傍に設定したことを
特徴とする４ＷＳガーデントラクタ。1. A 4WS garden tractor in which front wheels and rear wheels are steered wheels, a mower is attached to a lower part of a vehicle body between front and rear wheels, and ground wheels are provided on both left and right sides of a rear portion of the mower. A 4WS garden tractor characterized in that the turning center position of the front and rear wheels is set rearward of the central position between the front and rear wheels and in the vicinity of the grounding wheel of the mower.
JP3559688A 1988-02-17 1988-02-17 4WS Garden Tractor Expired - Fee Related JPH067B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP3559688A JPH067B2 (en) 1988-02-17 1988-02-17 4WS Garden Tractor
US07/309,519 US4977733A (en) 1988-02-17 1989-02-10 Four wheel steering tractor having a mid-mount mower

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3559688A JPH067B2 (en) 1988-02-17 1988-02-17 4WS Garden Tractor

Publications (2)

Publication Number Publication Date
JPH01211419A JPH01211419A (en) 1989-08-24
JPH067B2 true JPH067B2 (en) 1994-01-05

Family

ID=12446186

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3559688A Expired - Fee Related JPH067B2 (en) 1988-02-17 1988-02-17 4WS Garden Tractor

Country Status (1)

Country Link
JP (1) JPH067B2 (en)

Also Published As

Publication number Publication date
JPH01211419A (en) 1989-08-24

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