JPH04103406U - riding lawn mower - Google Patents

Abstract

(57)【要約】 【目的】 モーアに近い機体前部に旋回中心が位置する
小半径旋回走行が可能なものでありながら、機体を安定
的に接地支持した状態で走行できる乗用型芝刈機を提供
する。 【構成】 左右の前輪６，６を非操向車輪に構成し、駆
動型左右後輪７，７を、夫々異なった操向角で旋回中心
が前輪６，６の回転軸芯上の機体左右中心位置に到るま
で揺動させて機体旋回を可能にする操向操作機構１４を
設ける。 (57) [Summary] [Purpose] To develop a riding lawn mower that is capable of turning in a small radius with the turning center located at the front of the machine near the mower, while also being able to run with the machine stably supported on the ground. provide. [Configuration] The left and right front wheels 6, 6 are configured as non-steering wheels, and the drive type left and right rear wheels 7, 7 are set at different steering angles so that the center of rotation is on the rotation axis of the front wheels 6, 6. A steering operation mechanism 14 is provided which enables the aircraft to turn by swinging until it reaches the center position.

Description

【考案の詳細な説明】[Detailed explanation of the idea]

【０００１】0001

【産業上の利用分野】[Industrial application field]

本考案は、乗用型走行機体の前部にモーアを連結し、前記走行機体における後 輪を操向自在に構成してある乗用型芝刈機に関する。 The present invention connects a mower to the front part of a passenger-type traveling body, and This invention relates to a riding lawn mower whose wheels are configured to be freely steerable.

【０００２】0002

【従来の技術】[Conventional technology]

上記乗用型芝刈機において、従来では、例えば実開平２−１０２９２２号公報 に開示されているように、左右前輪を非操向車輪に構成するとともに、左右一対 の後輪を中央の縦軸芯周りで左右夫々に約９０度一体的に操向揺動自在に構成し たものがあった。 In the above-mentioned riding type lawn mower, conventionally, for example, As disclosed in The rear wheels are constructed so that they can be steered and swung integrally by approximately 90 degrees to the left and right around the central vertical axis. There was something.

【０００３】0003

【考案が解決しようとする課題】[Problem that the idea aims to solve]

上記従来構造は、芝刈り作業状況を操縦部から目視することができるというフ ロントマウントモーア形式の利点を生かしながら、回り刈り作業時における刈り 残し領域を可及的に少なくするために後輪操向形態に構成して、前輪の軸芯上近 くに旋回中心が位置するように設け、操向切れ角を大きくするために後輪を一体 的に縦軸芯周りで回動させるようにしたものである。 The above conventional structure has a screen that allows you to visually check the mowing work status from the control section. While taking advantage of the front mount mower format, it is possible to cut during circular mowing work. In order to reduce the remaining area as much as possible, it is configured in a rear wheel steering configuration, and the The center of turning is located at the center of the wheel, and the rear wheels are integrated to increase the steering angle. It is designed to rotate around a vertical axis.

【０００４】 ところが、上記従来構造によると、後輪は左右一対設けられるが、一体的に回 動させるために近接配備しなければならず、凹凸の多い芝地において上記したよ うな機体旋回を行うと、３点支持状態に近くなり機体が不安定になるおそれもあ り、改善の余地があった。 本考案は上記不具合点を解消することを目的としている。0004 However, according to the above conventional structure, a pair of left and right rear wheels are provided, but they do not rotate integrally. They must be placed close to each other in order to move them, and the above-mentioned If the aircraft turns like this, it will become close to a three-point support state and the aircraft may become unstable. However, there was room for improvement. The present invention aims to solve the above-mentioned problems.

【０００５】[0005]

【課題を解決するための手段】[Means to solve the problem]

本考案の特徴構成は、冒頭に記載した乗用型芝刈機において、前記走行機体に おける左右一対の前輪を非操向車輪に構成し、左右一対の後輪を走行駆動するよ う構成するとともに、機体旋回中心がほぼ前記前輪の回転軸芯上でかつ機体左右 中心位置に到るまで、左右後輪を夫々異なった操向角で操向揺動させる操向操作 機構を設けてある点にある。 The characteristic configuration of the present invention is that in the riding lawn mower described at the beginning, the traveling body is A pair of left and right front wheels are configured as non-steering wheels, and a pair of left and right rear wheels are configured to drive the vehicle. In addition, the center of rotation of the aircraft is approximately on the axis of rotation of the front wheels and the left and right sides of the aircraft are aligned. A steering operation in which the left and right rear wheels are steered at different steering angles until they reach the center position. There is a mechanism in place.

【０００６】[0006]

【作用】[Effect]

回り刈り作業等の小半径旋回走行を行う場合に、前記操向操作機構によって左 右後輪が異なった操向角で操向揺動しながら、前輪の軸芯上に沿って旋回中心が 移動して、最大切れ角においては旋回中心が機体左右中心位置まで到る。従って 、機体前部に設けたモーアの横側端付近を中心に旋回することができ、回り刈り 作業における刈り残し領域を少なくできる。又、左右後輪は夫々異なった操向角 で上記したような小半径旋回走行が現出できるので、一体的に回動させる必要が なく、車輪間隔を広く設定することができる。 When performing small radius turns such as for round mowing work, the steering operation mechanism While the right rear wheel is oscillating at different steering angles, the turning center is aligned along the axis of the front wheel. As it moves, the turning center reaches the center position of the left and right sides of the aircraft at the maximum turning angle. Therefore , it is possible to turn around the side edge of the mower installed at the front of the machine, allowing circular mowing. The amount of uncut area during work can be reduced. Also, the left and right rear wheels have different steering angles. Since it is possible to perform small-radius turning as described above, it is not necessary to rotate in an integrated manner. This allows the wheel spacing to be set wider.

【０００７】[0007]

【考案の効果】[Effect of the idea]

従って、モーアに近い機体前部に旋回中心が位置する小半径旋回走行が可能な ものでありながら、左右前輪及び広い車輪間隔を有する左右後輪により、安定的 に機体を支持しながら小半径旋回走行を行うことが可能となって、凹凸のある不 整地を走行する場合であっても、安定的に機体を接地支持した状態で旋回走行が 行えるものとなった。しかも、最大切れ角においては旋回中心が前輪軸芯上で機 体左右中央位置になるので、機体のほぼ中心位置を旋回中心とする小半径方向転 換も可能となり、狭い場所での方向転換が行える利点もある。 Therefore, it is possible to perform small radius turns with the turning center located at the front of the aircraft near the mower. Although it is a compact vehicle, it is stable due to the left and right front wheels and the left and right rear wheels with wide wheel spacing. It is now possible to perform small radius turns while supporting the aircraft, making it possible to avoid bumpy bumps. Even when traveling on level ground, turning can be performed with the aircraft stably supported on the ground. It became possible to do it. Moreover, at the maximum turning angle, the turning center is aligned with the front wheel axis. Since the body is located at the center of the left and right sides of the aircraft, it is possible to rotate in a small radius direction with the turning center approximately at the center of the aircraft. It also has the advantage of being able to change directions in tight spaces.

【０００８】[0008]

【実施例】【Example】

以下、実施例を図面に基いて説明する。 図３に乗用型芝刈機を示している。この芝刈機は、乗用型走行機体１の前部に リンク機構２を介してモーア３を連結して構成してある。走行機体１は、機体前 部に操縦部４を配設するとともに、操縦部４の後部下方にエンジン５を搭載し、 エンジン５の動力を静油圧式無段変速装置ＨＳＴを介して前後車輪６，７に伝え て機体を走行させるよう構成してある。又、左右一対の前輪６，６は非操向車輪 に構成してあり、左右後輪７，７を操向自在に構成してある。伝動系について詳 述すると、図４に示すように、エンジン５の動力を静油圧式無段変速装置ＨＳＴ 、ギア式減速機構８を介してセンター差動機構９に伝え、センター差動機構９か らクラッチ機構１０、前輪用差動機構１１を介して前輪６に伝える系と後輪用差 動機構１２を介して後輪７に伝える系とに動力を振りわけ、夫々前後車輪６，７ を駆動するよう伝動系を構成してある。前記クラッチ機構１０は、機体が直進状 態あるいは緩やかな旋回走行時にはクラッチ入り状態にあり、後輪７，７の操向 角が約６０度以上になると自動的にクラッチ切り状態となり、後輪７，７のみの 駆動状態となるよう構成してある。 Examples will be described below based on the drawings. Figure 3 shows a riding lawn mower. This lawn mower has a front part of the riding type traveling machine body 1. A mower 3 is connected via a link mechanism 2. The traveling aircraft 1 is at the front of the aircraft. A control section 4 is disposed in the section, and an engine 5 is mounted at the rear and lower part of the control section 4. Power from the engine 5 is transmitted to the front and rear wheels 6 and 7 via the hydrostatic continuously variable transmission HST. The aircraft is configured to run using Also, the pair of left and right front wheels 6, 6 are non-steering wheels. The left and right rear wheels 7, 7 are configured to be freely steerable. More information about the transmission system Specifically, as shown in FIG. 4, the power of the engine 5 is transferred to the hydrostatic continuously variable transmission HST. , is transmitted to the center differential mechanism 9 via the gear type reduction mechanism 8, and the center differential mechanism 9 A clutch mechanism 10, a system for transmitting information to the front wheels 6 via a front wheel differential mechanism 11, and a rear wheel differential The power is distributed to a system that transmits the power to the rear wheels 7 via the drive mechanism 12, and the power is transmitted to the front and rear wheels 6, 7, respectively. The transmission system is configured to drive. The clutch mechanism 10 operates when the aircraft is moving straight. The clutch is in the engaged state when the vehicle is moving or making a gentle turn, and the steering of the rear wheels 7, 7 is controlled. When the angle reaches approximately 60 degrees or more, the clutch is automatically disengaged and only the rear wheels 7 and 7 are engaged. It is configured to be in a driving state.

【０００９】 次に、操向操作構成について説明する。左右後輪７，７は、前輪６，６とほぼ 等しい間隔をあけて配備してあり、操縦ハンドル１３の回動操作量に応じて駆動 される油圧式ステアリング機構Ａにより揺動駆動するよう構成してあり、機体旋 回中心がほぼ前記前輪６，６の回転軸芯上でかつ機体左右中心位置に到るまで、 左右後輪７，７を夫々異なった操向角で操向揺動させる操向操作機構１４を設け てある。詳述すると、図１に示すように、操縦ハンドル１３の基端部にステアリ ング用油圧制御弁１５を配設するとともに、このステアリング用油圧制御弁１５ から回動操作量に応じて供給される作動油によって、ステアリングシリンダ１６ が後輪７，７の揺動駆動用天秤アーム１７を駆動揺動するよう構成してある。天 秤アーム１７は左右中央の縦軸芯Ｙ周りで天秤揺動自在に機体フレームに枢支し 、天秤アーム１７の両端は、夫々、押し引きリンク３０，３０を介して後輪７， ７のナックルアーム１８，１８に枢支連結してある。尚、前記天秤アーム１７の 近傍には、約６０度以上の操向切れ角になると、そのことを検出して前記クラッ チ機構１０を切り作動させるために該クラッチ機構１０にワイヤ２１連係した一 対の検知揺動アーム２２，２２を配設してある。[0009] Next, the steering operation configuration will be explained. The left and right rear wheels 7, 7 are almost the same as the front wheels 6, 6. They are arranged at equal intervals and are driven according to the amount of rotation of the control handle 13. It is configured to be rocked by a hydraulic steering mechanism A, which allows the aircraft to rotate. Until the center of rotation is approximately on the axis of rotation of the front wheels 6, 6 and reaches the left-right center position of the aircraft, A steering operation mechanism 14 is provided for steering and rocking the left and right rear wheels 7, 7 at different steering angles. There is. To be more specific, as shown in FIG. A hydraulic control valve 15 for steering is provided, and a hydraulic control valve 15 for steering is also provided. The hydraulic oil supplied from the steering cylinder 16 according to the amount of rotational operation is configured to drive and oscillate a balance arm 17 for swinging the rear wheels 7, 7. Heaven The balance arm 17 is pivoted to the aircraft frame so that the balance can swing freely around the vertical axis Y at the center of the left and right sides. , both ends of the balance arm 17 are connected to the rear wheels 7, 17 via push/pull links 30, 30, respectively. It is pivotally connected to the knuckle arms 18, 18 of 7. Note that the balance arm 17 In the vicinity, when the steering angle becomes more than about 60 degrees, it is detected and the above-mentioned crack is activated. A wire 21 is connected to the clutch mechanism 10 to cut and operate the clutch mechanism 10. A pair of detection swing arms 22, 22 are provided.

【００１０】 図２にも示すように、後輪伝動軸２３を内挿支持するとともに、後車輪支持ケ ース１９を操向揺動自在に支持する縦フレーム２４の機体横側に枢支ボス２５を 一体固定するとともに、この枢支ボス２５にナックルアーム１８の回動支軸２６ を相対回動自在に内嵌し、ナックルアーム１８の他端部と後車輪支持ケース１９ に固定立設したピン２８とを押し引きアーム２９を介して連動連結してある。ナ ックルアーム１８は縦フレーム２４を迂回して大きく操向回動させるために弓形 に屈曲成形してある。0010 As shown in FIG. 2, the rear wheel transmission shaft 23 is inserted and supported, and the rear wheel support A pivot boss 25 is provided on the side of the fuselage of the vertical frame 24 that supports the base 19 so as to be able to freely steer and swing. In addition to being integrally fixed, a pivot shaft 26 of the knuckle arm 18 is attached to this pivot boss 25. The other end of the knuckle arm 18 and the rear wheel support case 19 are fitted into each other so as to be relatively rotatable. It is interlocked and connected to a pin 28 which is fixed and erected to the pin 28 via a push/pull arm 29. Na The buckle arm 18 has an arcuate shape in order to bypass the vertical frame 24 and perform large steering rotations. It is bent and molded.

【００１１】 このように構成すると、前記ステアリングシリンダ１６の駆動により天秤アー ム１７を介してナックルアーム１８，１８が回動軸２６軸芯周りで回動するとと もに、押し引きアーム２９を介して後車輪支持ケース１９が操向揺動する。この とき、ナックルアーム１８の回動軸芯Ｐ１、各枢支連結点Ｐ２，Ｐ３及び操向回 動軸芯Ｐ４の４点において不等辺四連リンクを構成し、ナックルアーム１８の長 さをピン２８と操向回動軸芯Ｐ４との距離よりも長く形成して、ナックルアーム １８の操作回動角に対する後輪７の操作回動角が増大するよう構成してある。し かも、旋回内側の後輪７は９０度以上機体内側に向けて操作揺動可能に構成して 、旋回中心が前輪６の回転軸芯上でかつ機体左右中心位置Ｑに到るまで変更可能 に操向操作機構１４を構成してある（図５、図６参照）。 このように前後車輪６，７を夫々左右間隔の広い安定した４輪支持状態で機体 を支持することができるものでありながら、機体前部横側のモーア３側端近傍を 中心として機体旋回することができ、小半径回り刈り走行を行うことが可能で、 かつ、前輪６車軸芯上の機体左右中央部を中心とする小半径方向転換を行うこと もでき、狭い作業場所での小回り作業性が向上するものとなる。[0011] With this configuration, the balance arm is moved by driving the steering cylinder 16. When the knuckle arms 18, 18 rotate around the rotation axis 26 via the arm 17, At the same time, the rear wheel support case 19 is steered and swung via the push/pull arm 29. this When the rotation axis P1 of the knuckle arm 18, each pivot connection point P2, P3, and the steering rotation Four scalene links are formed at the four points of the moving axis P4, and the length of the knuckle arm 18 is The knuckle arm is formed to be longer than the distance between the pin 28 and the steering rotation axis P4. The operating rotation angle of the rear wheel 7 is increased relative to the operating rotation angle of the rear wheel 18. death Perhaps, the rear wheel 7 on the inside of the turn is configured so that it can be operated and swung toward the inside of the aircraft by more than 90 degrees. , the turning center can be changed until it is on the rotation axis of the front wheel 6 and reaches the left-right center position Q of the aircraft. A steering operation mechanism 14 is configured (see FIGS. 5 and 6). In this way, the aircraft is maintained in a stable four-wheel support state with the front and rear wheels 6 and 7 each having a wide space between the left and right wheels. Although it is capable of supporting The machine can turn around the center and mowing around a small radius. Also, perform a small radius direction change centered on the left and right center of the aircraft above the 6 front wheel axles. This also improves the ease of turning around in narrow working spaces.

【００１２】 尚、実用新案登録請求の範囲の項に図面との対照を容易にするために符号を記 すが、該記入により本考案は添付図面の構成に限定されるものではない。0012 In addition, symbols are written in the claims section of the utility model registration to facilitate comparison with the drawings. However, the present invention is not limited to the configuration shown in the attached drawings.

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

【図１】操向操作系統を示す平面図[Figure 1] Plan view showing the steering operation system

【図２】車輪支持部の断面図[Figure 2] Cross-sectional view of the wheel support part

【図３】芝刈機の全体側面図[Figure 3] Overall side view of lawn mower

【図４】伝動系統図[Figure 4] Transmission system diagram

【図５】操向操作状態を示す平面図[Fig. 5] Plan view showing the steering operation state

【図６】操向操作状態を示す平面図[Fig. 6] Plan view showing the steering operation state

【符号の説明】[Explanation of symbols]

１ 走行機体 ３ モーア ６ 前輪 ７ 後輪 １４ 操向操作機構 1 Traveling aircraft 3 Moa 6 Front wheel 7 Rear wheel 14 Steering operation mechanism

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 【請求項１】 乗用型走行機体（１）の前部にモーア
（３）を連結し、前記走行機体（１）における後輪
（７）を操向自在に構成してある乗用型芝刈機であっ
て、前記走行機体（１）における左右一対の前輪
（６），（６）を非操向車輪に構成し、左右一対の後輪
（７），（７）を走行駆動するよう構成するとともに、
機体旋回中心がほぼ前記前輪（６），（６）の回転軸芯
上でかつ機体左右中心位置に到るまで、左右後輪
（７），（７）を夫々異なった操向角で操向揺動させる
操向操作機構（１４）を設けてある乗用型芝刈機。1. A riding type lawn mower, in which a mower (3) is connected to the front part of a riding type traveling body (1), and the rear wheels (7) of the traveling body (1) are configured to be freely steerable. The pair of left and right front wheels (6), (6) of the traveling body (1) are configured as non-steering wheels, and the pair of left and right rear wheels (7), (7) are configured to be driven to travel. ,
The left and right rear wheels (7), (7) are steered at different steering angles until the center of rotation of the aircraft is approximately on the axis of rotation of the front wheels (6), (6) and reaches the left and right center position of the aircraft. A riding lawn mower equipped with a steering operation mechanism (14) for swinging.