JPH01211419A - 4ws garden tractor - Google Patents
4ws garden tractorInfo
- Publication number
- JPH01211419A JPH01211419A JP3559688A JP3559688A JPH01211419A JP H01211419 A JPH01211419 A JP H01211419A JP 3559688 A JP3559688 A JP 3559688A JP 3559688 A JP3559688 A JP 3559688A JP H01211419 A JPH01211419 A JP H01211419A
- Authority
- JP
- Japan
- Prior art keywords
- wheels
- wheel
- tractor
- mower
- center
- 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.)
- Granted
Links
- 244000025254 Cannabis sativa Species 0.000 description 11
- 230000008676 import Effects 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000009304 pastoral farming Methods 0.000 description 1
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
Abstract
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。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a 4WS garden tractor used for mowing gardens and the like.
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。2. Description of the Related Art A mower mounted on a tractor for mowing lawns, etc. is known, for example, as described in Japanese Utility Model Publication No. 61-37218.
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）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。In this conventional vehicle, a mower is attached to the lower part of the vehicle body between the front wheels and the rear wheels of a 4WD vehicle in which the front wheels are used as steering wheels and the front and rear wheels are used as driving wheels. Gauge wheels (ground wheels) were provided on both left and right sides of the front and rear parts of this mower.
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。This gauge wheel is used to adjust the cutting height when mowing the lawn with a mower. The rear gauge wheels were caster-type, and were configured to naturally follow the tractor's steering.
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。In the conventional tractor, only the front wheels were used as steering wheels, so the turning radius was large, making it difficult to use in small gardens and 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 the front wheels and the rear wheels are used as steering wheels so that the mower can be mowed with a small turning radius. It is also possible to mow the lawn by repeatedly moving back and forth 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
ゲージ輸が、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 repeatedly move forward and backward, the mower's caster type gauge will rotate 180 degrees when changing from forward to reverse or from reverse to forward, causing problems such as damaging the grass or digging into the ground. occured.
そこで、ゲージ輪を固定式にすると、今度は、４ＷＳ
）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, by making the gauge wheel fixed, the 4WS
) When the tractor made a small turn, the gauge wheels were not able to follow suit sufficiently, causing the problem of skidding and damaging the grass.
即ち、第６図に示すように、４ＷＳ）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。That is, as shown in FIG. 6, in the 4WS tractor, its turning center 60 is located approximately in the center between the front wheels 61 and the rear wheels 62 (for example, "New Automotive Engineering Handbook",
Edited by Society of Automotive Engineers of Japan, published by Tosho Publishing Co., Ltd.
8th edition published on May 25, 1981.
第８−１頁参照）、従って、モーアロ３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。Therefore, the rear gauge wheel 64 of Moaro 3 is located far away from the turning center 60, and it is particularly difficult for the fixed gauge wheel 64 on the inside of the turning to follow the turning trajectory of the tractor. There was a problem.
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。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a 4WS garden tractor that does not damage the grass with the gauge wheels even when the tractor is moved forward or backward, and does not damage the grass with the gauge wheels even when it makes small turns.
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 object, the present invention takes the following measures. That is, the present invention is characterized in that the front wheels and the rear wheels are used as steering wheels, a mower is attached to the lower part of the vehicle body between the front and rear wheels, and grounding wheels are provided on both left and right sides of the rear 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 near the ground contact wheel of the mower.
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 contact wheels at the rear of the mower, the ground contact wheel on the turning center side
Since it is located near the turning center, the movement of the ground contact wheel is minimal, so it does not damage the grass.
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 ground contact wheel on the outside of the turn has a large turning radius,
Side sliding is small and does not damage the grass.
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 based on the drawings.
第１図及び第２図において、ｌは４ＷＳ）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, l is a 4WS wheel, whose 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の下部にモ
ーアロが上下動自在に装着されている。A mower is attached to the lower part of the vehicle body 5 between the front wheels 2 and rear wheels 3 of the tractor 1 so as to be movable up and down.
モーアロ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７６の刈刃９を回転駆動するよう構成されている
。A power receiving device 7 is provided in the center of the upper surface of the mooro,
The power receiving device 7 and the tractor 1 are connected by a transmission shaft 8, and are configured to rotationally drive the cutting blade 9 of the mower 76.
第１図に示すように、モーアロの左右方向の中心線１０
と、車体５の中心線１−１とは若干ずれており、モーア
ロ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、モーアロの前後
方向の中心線１３と前後輪２，３間の前後方向中心線１
３とは略一致している。As shown in FIG.
It is slightly shifted from the center line 1-1 of the vehicle body 5, and of both left and right end portions of the moorrow, the end on the side that enters the vehicle body side is the grass clippings discharge port 12. In addition, the center line 13 in the longitudinal direction of the motor wheel and the center line 1 in the longitudinal direction between the front and rear wheels 2 and 3
3 is approximately the same.
前記モー７６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 portion of the mower 76, and rear grounding wheels 15 are provided on both left and right sides of the rear portion. These ground wheels 14, 15 are not caster type but fixed type. The rear ground contact wheel 15 is disposed further outward than 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 devices (not shown) for the front wheels 2 and rear wheels 3 of the tractor 1 are configured to control the turning center 16 at the time of minimum turning.
is located near the rear ground contact 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ＩＩだけ後方で、かつ、後部接地輪１５の中
心から前後方向に１．だけ離れ、左右方向に１３だけ離
れた位置に位置している。勿論、この１． 、ｎ、は可
及的に零になるのが望ましい。In other words, the turning center 16 at the time of minimum turning is II back of the center line 13 in the longitudinal direction, and 1. They are located at a distance of 13 in the left and right direction. Of course, this 1. , n is preferably zero as much as possible.
前記本発明の実施例によれば、モーアロの接地輪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.
15 is a fixed type rather than a caster type, so even when the tractor 1 is changed from forward to reverse or vice versa,
The ground wheels 14 and 15 do not change direction like caster types, so they do not damage the grass.
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。Furthermore, when the tractor 1 is turned with the minimum turning radius, the rear ground contact wheel 15 on the inside side of the turn is located near the turning center 16, so its sideslip is small and does not damage the grass.
Since the ground contact wheel 15 located away from the turning center 16 has a relatively large turning radius, grazing due to sideslip does not pose a problem.
第３図及び第４図に示すものは、後部接地輪１５を約１
０＠の範囲で揺動できるように取付けたものである。In the case shown in FIGS. 3 and 4, the rear grounding wheel 15 is approximately 1
It is installed so that it can swing within a range of 0@.
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に突設されたビン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, a caster portion 18 is rotatably provided on the fixed shaft 17 on the mower side, a long hole 19 is formed in the caster portion 18, and a bin 20 protruding from the fixed shaft 17 is inserted into the long hole 19.
is inserted. Therefore, the caster part 18 has a long hole 19.
This rotation range is about 10'' from the straight-ahead 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 ground contact wheel 15 so as to be rotatable by approximately 10 degrees in this manner, even if the turning center 16 and the rear ground contact wheel 15 are slightly deviated, the rear ground contact wheel 15 can easily follow the turning trajectory.
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、ｌＯ″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。The reason why the rotation range of the rear ground contact wheel 15 is set to approximately 10'' is because when moving from forward to reverse or vice versa, if the rotation range exceeds 10'', the inclination of the rear ground contact wheel 15 will become too large and damage the grass. It is. If it is 10" or less, it will not damage the grass and will provide sufficient tracking when turning.
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。What is shown in FIG. 5 is a drive system for the tractor 1, which is a part of a drive system for a 4WD tractor in which both front wheels and rear wheels are used as 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, engine power is transmitted to the front and rear wheels at the same time, but as mentioned above, in 4WS, if the turning center is set to the rear wheels, the turning radius of the front wheels will shift to the rear wheels when turning. , and the front wheel's travel trajectory is longer than the rear wheel's.
従って、旋回時は前輪の周速を後輪の周速よりも大きく
しなければならない。Therefore, when turning, the circumferential speed of the front wheels must be greater than the circumferential 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
達系路にワンウェ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 circumferential speed of the front and rear wheels, a one-way clutch was interposed in the power transmission path on the front wheel side to transmit power from the engine but not from the wheels. As the speed increased, only the rear wheels were driven.
しかしながら、ワンウェ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、−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
ェイクラッチのため止まらず、前輪は惰性で回転し続は
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, when a one-way clutch is installed, only the rear wheels are driven when moving in reverse. Also, if the front wheels fall into mud or a hole while moving forward, in order to escape, you must stop the rotation of the wheels and then start suddenly, or you must move backwards and then move forward. However, on muddy ground, there is less resistance, so even if you try to stop the rotation of the front wheels, the one-way clutch won't stop them, and the front wheels will continue to rotate due to inertia. There was also the problem that even if the vehicle tried to move backwards, power would not be transmitted to the front wheels, making it impossible to escape from the hole.
そこで、第５図に示すように、前輸入力軸２１とエンジ
ン動力軸２２間に、エンジン動力を前輸入力軸２１に伝
達するが、前輸入力軸２１からの動力は動力軸２２に伝
達しないワンウェイクラッチ２３を設け、かつ、ワンウ
ェイクラッチ２３のケーシング２４と前輸入力軸２１と
を直結するシフトギヤ２５を前輸入力軸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と前輸入力軸２１とを直結したり、ワンウ
ェイクラッチ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, the engine power is transmitted to the front import power shaft 21 between the front import power shaft 21 and the engine power shaft 22, but the power from the front import power shaft 21 is transmitted to the power shaft 22. A one-way clutch 23 is provided, and a shift gear 25 directly connecting a casing 24 of the one-way clutch 23 and the front import power shaft 21 is slidably provided on the front import power shaft 21. By turning on and off the shift gear 25, the power shaft 22 and the front import power shaft 21 are connected directly or via the one-way clutch 23.
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、前輸入力軸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 26.27, and the front power shaft 21 meshes with a bevel gear 28.29.
A differential device 31 is provided on the sleeve shaft 30, and a front axle 32 extends from the differential device 31.
本発明によれば、４ＷＳＩ−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, even if the turning radius is reduced in a 4WSI-tractor, the lawn can be mowed neatly without damaging the lawn.
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。
特 許 出 願 人 久保田鉄工株式会社第２図
第６図FIG. 1 is a plan view of the main part showing an embodiment of the present invention, and FIG.
A side view showing the entire WS garden tractor, Fig. 3 is a plan view showing the rear ground contact wheel, Fig. 4 is a side view of the same, 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...
...More, 15...Grounding wheel, 16...Turning center. Patent applicant Kubota Iron Works Co., Ltd. Figure 2 Figure 6
Claims (1)
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) In a 4WS garden tractor in which the front wheels and the rear wheels are used as steering wheels, a mower is attached to the lower part of the vehicle body between the front and rear wheels, and ground wheels are provided on both left and right sides of the rear of the mower, the front and rear wheels include: A 4WS garden tractor characterized in that the turning center position of the 4WS garden tractor is set behind the center position between the front and rear wheels and near the ground contact wheel of the mower.
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 true JPH01211419A (en) | 1989-08-24 |
| JPH067B2 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) |
-
1988
- 1988-02-17 JP JP3559688A patent/JPH067B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH067B2 (en) | 1994-01-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |