200936035 九、發明說明 【發明所屬之技術領域】 本發明係關於，在行走機體中具備原動力部、以及藉 由來自原動力部的動力而轉動之行走裝置及割刀之步行式 割草機。 【先前技術】 © 作爲先前技術，爲人所知者例如有日本特開2007_ 5 3 99 1號公報（以下稱爲「專利文獻1」）所揭示者，將 發動機（專利文獻1之第1圖的5)裝載於具備行走車輪 (專利文獻1之第1圖的4)之行走機體，並具備藉由來 自此發動機的動力而轉動之割刀（專利文獻1之第1圖的 2 )之步行式割草機。 【發明內容】 ® (發明所欲解決之課題） 於專利文獻1的步行式割草機中，係以使構成割刀之 基座（專利文獻1之第13圖的66)與刀刃（專利文獻1 之第13圖的67)與地面大致平行之方式，於驅動箱體的 下部（專利文獻1之第13圖的9)安裝割刀，當使步行式 割草機前進時，從前方所導入的草由割刀的前部所割除， 當使步行式割草機後退時，從後方所導入的草由割刀的後 部所割除。 因此，即使割刀當中實際用於割草的部分爲割刀的前 -5- 200936035 部或後部，不論是使步行式割草機前進或是使步行式割草 機後退時，割刀的下面側於涵蓋大致全區域上，係位於與 地面接近之位置，所以通過割刀下側之割除後存在於地面 的草，對割刀的旋轉容易造成阻力。結果導致用來驅動割 刀之發動機的負擔增大，就達到發動機的小型化及步行式 割草機的輕量化之觀點來看，仍有改善的空間。 本發明之目的在於能夠以簡單的構造，來實現一種可 Φ 進行使行走機體前進時的割除作業及使行走機體後退時的 割除作業，而節省使割刀旋轉的動力之步行式割草機。 (用以解決課題之手段） 本發明之特徵性構成，爲於行走機體中，具備原動力 部、以及藉由來自前述原動力部的動力進行轉動之行走裝 置與割刀之步行式割草機中： 使前述割刀，繞上下軸心的周圍轉動自如、且繞左右 ® 軸心的周圍能夠擺動地支撐於前述行走機體； 並且具備：當使前述行走機體前進時，會使前述割刀 的前側變更姿勢爲往下方擺動之前降傾斜姿勢，當使前述 行走機體後退時，會使前述割刀的後側變更姿勢爲往下方 擺動之後降傾斜姿勢之傾斜姿勢變更機構。 根據上述構成，藉由使行走機體前進（後退），可藉 由變更姿勢爲前降傾斜姿勢（後降傾斜姿勢）之割刀的前 部（後部）來割除從前方所導入的草。此時，即使割刀爲 前降傾斜姿勢（後降傾斜姿勢），由於割除草的部分爲割 -6- 200936035 刀的前側（後側），所以能夠無障礙地割除從前方（後方 )所導入的草。於前降傾斜姿勢（後降傾斜姿勢）中’由 於割刀的後側（前側）遠離上方，所以’通過割刀下側的 草不易對割刀的旋轉造成阻力’而能夠降低用來驅動割刀 之原動力部的負擔。因此’可構成爲能夠進行使行走機體 前進時的割除作業及使行走機體後退時的割除作業’並將 驅動割刀之原動力部的輸出設定較小’而節省使割刀旋轉 〇 的動力。 此外，由於割刀是繞左右軸心的周圍能夠擺動地支撐 於行走機體，所以，藉由使割刀對行走機體擺動’可容易 顯現出割刀的前降傾斜姿勢及後降傾斜姿勢。其結果爲， 容易進行割刀的前降傾斜姿勢及後降傾斜姿勢之切換，而 簡化傾斜姿勢變更機構的構造。 如上述般，結果可達到原動力部的小型化及步行式割 草機的輕量化，並且降低步行式割草機的製造成本。 © 於上述構成中，較理想爲使前述割刀繞上下軸心（P2 )的周圍轉動自如地支撐於前述原動力部的下部，並且使 前述原動力部繞左右軸心的周圍能夠擺動地支撐於前述行 走機體，而構成前述傾斜姿勢變更機構。 根據本構成，藉由使原動力部繞左右軸心的周圍對行 走機體擺動，可使割刀與原動力部一體地繞左右軸心的周 圍對行走機體擺動，而容易顯現出割刀的前降傾斜姿勢及 後降傾斜姿勢。此外，例如當僅使割刀繞左右軸心的周圍 擺動而構成時，割刀與原動力部之間的連接構造可能變得 -7- 200936035 複雜’但藉由使原動力部與割刀一體地繞左右軸 擺動，可防止割刀與原動力部之間的連接構造變 其結果爲’更容易進行割刀的前降傾斜姿勢及後 勢之切換，而更爲簡化傾斜姿勢變更機構的構造 如上述般，結果可達到步行式割草機之更進 量化，並且更可降低步行式割草機的製造成本。 於上述構成中，較理想爲從前述原動力部的 〇 部，以朝向左右將同心圓狀的驅動軸及擺動支軸 並經由前述驅動軸將來自前述原動力部的動力傳 行走裝置；使前述驅動軸及擺動支軸，繞左右軸 能夠轉動地支撐於前述行走機體，而構成前述傾 更機構。 根據本構成，當藉由來自原動力部的動力使 轉而使行走機體前進（後退）時，由於力的作用 則，使與驅動軸的旋轉方向爲相反方向之力作用 ® 部，使原動力部與割刀一體地擺動，而變更姿勢 前側（後側）往下方擺動之前降傾斜姿勢（後降 )。結果爲，能夠有效地活用因驅動行走裝置所 性力，而將割刀自動地變更姿勢爲前降傾斜姿勢 斜姿勢），並且藉由變更行走機體的行走方向， 切換前降傾斜姿勢及後降傾斜姿勢。 具體而言，如第13圖所示，當使行走機體 驅動軸（第13圖的7a)以順時針方向繞左右軸 (第13圖的P1)旋轉時，由於力的作用反作用 心的周圍 得複雜。 降傾斜姿 〇 一步的輕 左右兩側 延伸出， 達至前述 心的周圍 斜姿勢變 驅動軸旋 反作用法 於原動力 爲割刀的 傾斜姿勢 產生的慣 (後降傾 可自動地 前進而使 心的周圍 法則使驅 -8 - 200936035 動軸以逆時針方向繞左右軸心的周圍旋轉之力，作用於原 動力部（第13圖的E) ’使原動力部與割刀（第14圖的 10) —體地往後方擺動，而變更姿勢爲割刀的前側往下方 擺動之前降傾斜姿勢。此外，如第14圖所示，當使行走 機體後退而使驅動軸以逆時針方向繞左右軸心的周圍旋轉 時，由於力的作用反作用法則使驅動軸以順時針方向繞左 右軸心的周圍旋轉之力，作用於原動力部（第14圖的E φ )，使原動力部與割刀（第14圖的10) —體地往後方擺 動，而變更姿勢爲割刀（第14圖的10)的後側往下方擺 動之後降傾斜姿勢。 如上述般，結果可簡單且迅速地切換前降傾斜姿勢及 後降傾斜姿勢，提升割除作業的作業性，並且更能夠簡化 傾斜姿勢變更機構的構造。 於上述構成中，較理想爲具備傾斜角度調節機構，其 可變更調節在前述前降傾斜姿勢下之割刀的前降傾斜角度 © 、或是在前述後降傾斜姿勢下之割刀的後降傾斜角度。 根據本構成，藉由傾斜角度調節機構來變更割刀的前 降傾斜角度及後降傾斜角度，藉此可變更割刀的高度，因 應草的長度調節傾斜角度調節機構，可割除較長或較短的 草。結果可簡化用以變更調節草的割草高度之機構，而減 少草的割草高度之機構的零件數。 如上述般，結果可構成爲能夠變更草的割草高度’並 將步行式割草機的製造成本抑制爲較低。 此外，本發明之其他的特徵性構成，爲於行走機體中 -9 - 200936035 具備原動力部，且使割刀繞上下軸心的周圍能夠轉動地連 結於前述原動力部的下部之步行式割草機中：以繞左右軸 心的周圍將前述原動力部支撐於前述行走機體，以使前述 割刀的前側成爲往下方擺動之前降傾斜姿勢；並且藉由使 前述原動力部及割刀一體地繞前述左右軸心的周圍變更姿 勢，使在前述前降傾斜姿勢下之前述割刀的前降傾斜角度 成爲可變更自如地構成。 © 根據本構成，當使原動力部及割刀一體地繞左右軸心 的周圍變更姿勢，來變更在前降傾斜姿勢下之割刀的前降 傾斜角度時，可變更割刀前側的高度，而能夠變更割除從 前方所導入的草之割刀前側的高度。此時，即使割刀爲前 降傾斜姿勢，由於割除草的部分爲割刀的前側，所以能夠 無障礙地割除從前方所導入的草。此外，於前降傾斜姿勢 中，由於割刀的後側遠離上方，所以，通過割刀下側的草 不易對割刀的旋轉造成阻力，而能夠降低用來驅動割刀之 ® 原動力部的負擔。 藉此，藉由使原動力部及割刀一體地繞左右軸心的周 圍變更姿勢，可調節由割刀所進行之草的割草高度，而不 須具備例如使割刀上下滑動移動之機構等。此外，例如當 僅使割刀繞左右軸心的周圍變更姿勢時，割刀與原動力部 之間的連接構造可能變得複雜，但藉由使原動力部與割刀 一體地繞左右軸心的周圍變更姿勢，可防止割刀與原動力 部之間的連接構造變得複雜。其結果爲，更可簡化用以變 更調節草的割草高度之機構，而能夠減少用以變更調節草 -10- 200936035 的割草高度之機構的零件數。 如上述般，結果可實現步行式割草機的輕量化及低成 本化，而提升例如由步行式割草機所進行之割除作業或步 行式割草機的搬運作業之作業性。 【實施方式】 [步行式割草機的的全體構成] 〇 以下依據第1圖〜第6圖，說明步行式割草機的全體 構成。第1圖及第2圖分別顯示步行式割草機之全體左方 側視圖及全體俯視圖，第3圖~第5圖分別顯示行走機體！ 之縱剖面左方側視圖、橫剖面俯視圖及縱剖面背視圖。第 6圖係說明前輪5及後輪6的支撐構造之縱剖面背視圖。 如第1圖及第2圖所示，於安裝在行走機體1之機體 框2，樞軸支撐有前部車軸3及後部車軸4，此前部車軸3 及後部車軸4的各左右兩端部，固定有板金製的前輪5、5 © 及後輪6、6(相當於行走裝置）。傳動箱體7係以繞左右 朝向之軸心P1的周圍擺動自如地支撐於機體框2的上部 ，一體地構成有燃料槽8a之發動機8，係連動地連結於此 傳動箱體7的上部，而構成原動力部E。於發動機8中安 裝有反彈式的啓動器8b，並可藉由此啓動器8b來驅動發 動機8而構成。 於行走機體1的右側部，配設有鏈條傳動機構9，來 自發動機8的動力，經由傳動箱體7內的傳達路徑被傳達 至鏈條傳動機構9，使前部車軸3及後部車軸4旋轉而使 -11 - 200936035 左右的前輪5及後輪6旋轉。於傳動箱體7的下部安裝有 割刀10，來自發動機8的動力，經由傳動箱體7內的傳達 路徑被傳達至割刀1〇，使割刀1〇旋轉而能夠進行割草。 如第4圖及第5圖所示，於機體框2的上部，固定有 俯視呈U字狀的框18，於此框18之從機體框2往左方側 延伸出之端部，使支軸19繞上下方向的軸心周圍轉動自 如地支撐。於支軸19的上端部，使托架20繞橫向的軸心 〇 周圍轉動自如地支撐，於此托架20，固定有管狀的操縱把 手2 1。 如第1圖及第2圖所示，操縱把手21係構成爲於上 下方向的軸心周圍能夠擺動移位，並且藉由與框1 8之間 所具備之第1鎖定機構22的作用，能夠選擇性地固定保 持於預先設定之上下方向的軸心周圍之複數個擺動位置， 並且藉由與框18之間所具備之第2鎖定機構23的作用， 能夠選擇性地固定保持於預先設定之橫向的軸心周圍之複 © 數個擺動位置。 於操縱把手21的延伸端部，裝設有握持部21a，於此 握持部21a，安裝有可對彈壓爲鎖定狀態之第1鎖定機構 22進行鎖定解除操作之第1解除搖桿24，以及可對彈壓 爲鎖定狀態之第2鎖定機構23進行鎖定解除操作之第2 解除搖桿25，並且分別銜接於第1及第2鎖定機構22、 23 ° 於操縱把手21的延伸端部，主離合器搖桿21b係以 可於橫向的軸心周圍進行擺動操作地裝設，並與後述之主 -12- 200936035 離合器63銜接，而構成爲可進行割刀10之旋轉的停止及 行走機體1的停止。 於操縱把手21的後端部，使可切換至前進位置、中 立位置、後退位置之前進後退切換搖桿26繞上下方向的 軸心周圍左右擺動地支撐，此前進後退切換搖桿26係與 後述之操作臂85銜接，而構成爲可藉由前進後退切換搖 桿26的操作來進行步行式割草機的前進位置、停止（中 〇 立）、後退之切換。 如第3圖、第4圖、第6圖所示，機體框2係具備： 前後較長之右方及左方的主框31、32;涵蓋右方及左方之 主框31、32的前端部所設置之前部框33;以及涵蓋右方 及左方之主框31、32的後端部所設置之後部框34而構成 〇 前部及後部框33、34，係由圓筒狀的構件所構成，並 且使左右方向的前部車軸3’夾介左右方的軸承構件37轉 〇 動自如地內嵌於前部框33，使左右方向的後部車軸4，夾 介左右方的軸承構件38能夠轉動自如地內嵌於後部框34 〇 涵蓋右方及左方之主框31、32的前端部，設置有用 以保護行走機體1的前部之前部連桿35 ’涵蓋右方及左方 之主框31、32的後端部，設置有用以保護行走機體1的 後部之後部連桿36。 如第3圖~第5圖所示，驅動軸7a係從傳動箱體7往 右方延伸出，此驅動軸7a係夾介軸承構件39，能夠轉動 -13- 200936035 自如地支撐於右方的主框31。與驅動軸7a呈同心狀之擺 動支軸7b，係從傳動箱體7往左方延伸出，此擺動支軸 7b係夾介軸承構件40，能夠繞左右方向的軸心P1的周圍 轉動自如地支撐於左方的主框32。藉此，可使傳動箱體7 、發動機8、及割刀10等，繞左右方向的軸心P1的周圍 ，能夠一體地前後擺動而支撐於機體框2。 驅動軸7a及擺動支軸7b於左右方向的軸心P1的俯 〇 視時之前後方向的位置，係配置於由驅動軸7a及擺動支 軸7b所支撐之傳動箱體7、發動機8、及割刀10等在前 後方向上之重心位置的附近，而構成爲在停止驅動軸7a 使慣性力不作用於傳動箱體7等之狀態下，割刀1 〇維持 於與地面大致呈水平之狀態，且在旋轉驅動軸7a使慣性 力作用於傳動箱體7等之狀態下，由驅動軸7 a的旋轉所 形成之慣性力，較由傳動箱體7等的本身重量所形成之軸 心P1周圍的力還大，而使割刀1〇變更姿勢爲前降傾斜姿 © 勢及後降傾斜姿勢（參考第13圖及第14圖）。 如第3圖〜第6圖所示’於右方主框31的右方外側， 裝設有鏈條傳動機構9。鏈條傳動機構9係具備：連動連 結於驅動軸7a的右外端部之驅動鏈輪41;連動連結於前 部車軸3的右外端部之前部鏈輪42;連動連結於後部車軸 4的右外端部之後部鏈輪43;配設於驅動鏈輪41的上部 之張力鏈輪44;以及涵蓋驅動鏈輪41、前部及後部鏈輪 42、43及張力鏈輪44而捲繞鋪設之傳動鏈條45而構成。 於右方主框31的右側面’裝設有左右分割爲二之鏈 -14 - 200936035 條蓋46，將左方的鏈條蓋46a固定於右方主框31，並從 右外方側將右方的鏈條蓋46b鎖緊固定此左方的鏈條蓋 46a，藉此，可藉由鏈條蓋46來覆蓋鏈條傳動機構9而構 成。 張力鏈輪44可繞左右方向的軸心周圍，轉動自如地 支撐於左方的鏈條蓋46a之前後中央部的上部。張力鏈輪 44係可於上下方向變更位置地安裝於左方的鏈條蓋46a， © 藉由調節張力鏈輪44的上下位置，可調節傳動鏈條45的 拉伸程度。 蓋50，係從右外方能夠裝卸地安裝於右方的鏈條蓋 46b之前後中央部，藉由卸下此蓋50，可對鏈條蓋46內 進行檢查而構成。 左右的前輪5、5及後輪6、6，係從橫向外方側外嵌 插入於前部車軸3及後部車軸4的左右兩端部，且能夠一 體地轉動而固定於前部車軸3及後部車軸4。當來自發動 Φ 機8的動力經由傳動箱體7被傳達至驅動軸7a，並經由鏈 條傳動機構9使前部車軸3及後部車軸4旋轉時，前輪5 及後輪6旋轉，使步行式割草機前進或後退而構成。 如上述般，使從傳動箱體7延伸出之驅動軸7a及擺 動支軸7b，繞左右方向的軸心P1的周圍能夠擺動地支撐 於行走機體1的機體框2，將來自發動機8的動力經由傳 動箱體7傳達至驅動軸7a，並藉由來自驅動軸7a的動力 ，經由鏈條傳動機構9使前輪5及後輪6旋轉，藉此可構 成傾斜姿勢變更機構，此傾斜姿勢變更機構，當使行走機 -15- 200936035 體1前進時，會使割刀10的前側變更姿勢爲往下方擺 之前降傾斜姿勢，當使行走機體1後退時，會使割刀 的後側變更姿勢爲往下方擺動之後降傾斜姿勢（參考第 圖及第14圖）。 [蓋的詳細構造] 以下根據第4圖〜第7圖，說明安裝於行走機體1 © 蓋的詳細構造。第7圖係說明可動飛散防止蓋54的構 之從機體內側所觀看的縱剖面側視圖。 如第4圖及第5圖所示，於右方及左方的主框31、 之前後中央部的下面側，固定有左右的上側蓋5 1，於此 右的上側蓋51，固定有左右的固定飛散防止蓋52。左 的固定飛散防止蓋52的下端與地面之間的間隙，係設 爲較右方的固定飛散防止蓋52的下端與地面之間的間 還寬，左方的固定飛散防止蓋52，藉由與後述之可動飛 © 防止蓋54之間的共同作用，可防止割草往左側飛散而 成。 如第5圖及第7圖所示，前後的鏈輪53係從框18 下方延伸出，於此前後的鏈輪53上，裝設有可動飛散 止蓋54。於可動飛散防止蓋54，形成有上下較長之前 的長孔54A，從前後的鏈輪53往左側方延伸出之前後 銷53A，係連通於此前後的長孔54A。於可動飛散防止 54的上部，設置有往內方側突出之彈簧安裝部54a，涵 此彈簧安裝部54a及前後的鏈輪53，裝設有彈性彈簧 動 10 13 之 造 3 2 左 方 定 隙 散 構 往 防 後 的 蓋 蓋 -16- 55 200936035 於可動飛散防止蓋54的前端部下部，形成有俯視爲 於前方上方形成有缺口之前部傾斜部54b，於可動飛散防 止蓋54的後端部下部，形成有俯視爲於後方上方形成有 缺口之後部傾斜部54c。藉此，例如當使步行式割草機前 進’使來自左側前方的石頭等障礙物接觸於可動飛散防止 蓋54時，可藉由形成於可動飛散防止蓋54之長孔54A， 〇 使可動飛散防止蓋54抵抗彈性彈簧55的彈壓力而往上方 移動。相反的，當使步行式割草機後退，使來自左側後方 的石頭等障礙物接觸於可動飛散防止蓋54時，可藉由形 成於可動飛散防止蓋54之長孔54A，使可動飛散防止蓋 54抵抗彈性彈簧55的彈壓力而往上方移動。 如第4圖及第5圖所示，可動飛散防止蓋54的前部 及後部，係以沿著左方前輪5及後輪6的外面之方式地配 置，並成形爲分別使前端部及後端部往內方側彎折之形狀 © ，往內方側彎折之前端部及後端部，係以俯視爲與前輪5 及後輪6重叠之方式地配置。此外，可動飛散防止蓋54 的下端與地面之間的間隙，係設定爲與右方的固定飛散防 止蓋52的下端與地面之間的間隙大致相同。藉此，可將 可動飛散防止蓋5 4的下端與地面之間的間隙、以及可動 飛散防止蓋54與前輪5及後輪6之間的間隙設定爲較小 ，而有效地防止割草往左側方飛散。 如上述般，藉由構成可動飛散防止蓋54，於一般時候 ，可藉由彈性彈簧55的彈壓力將可動飛散防止蓋54往下 -17- 200936035 方側彈壓而擴大前輪5及後輪6之間，並藉由可動飛散防 止蓋54從側方覆蓋，當接觸於障礙物時，可抵抗彈性彈 簧55的彈壓力使可動飛散防止蓋54往上方移動，而防止 可動飛散防止蓋54的破損。此外，可於行走機體1的右 側設置可動飛散防止蓋54，或是於行走機體1的左右兩側 設置可動飛散防止蓋54。 如第3圖及第6圖所示，覆蓋左右方的前輪5之間之 © 橡膠製的前部飛散防止構件56，係繞左右方向的軸心周圍 能夠前後擺動地安裝於涵蓋右方及左方的主框31、32所 設置之前部框33，覆蓋左右方的後輪6之間之橡膠製的後 部飛散防止構件57，係繞左右方向的軸心周圍能夠前後擺 動地安裝於涵蓋右方及左方的主框31、32所設置之後部 框34。前部及後部飛散防止構件56、57，的左右兩端部 ，係成形爲分別進入於前輪5及後輪6的內側之形狀，藉 此，可有效地防止割草往前方及後方飛散。 〇 如第4圖及第6圖所示，機體框2係藉由前後分割爲 二之前後的上部蓋58，從上方予以覆蓋。前後的上部蓋 58之中央部，係成形爲往上方膨脹之形狀，外周部成形爲 水平形狀，前後的上部蓋58之成形爲水平形狀的左右兩 側部，係鎖緊固定於右方及左方的主框3 1、32之上面側 的複數處。 [割刀的詳細構造] 以下根據第5圖及第8圖，說明割刀10的詳細構造 -18- 200936035 。第8圖係說明割刀的構造之橫剖面俯視圖。 如第5圖及第8圖所示，割刀1 〇係具備··將割刀】〇 安裝於傳動箱體7的下部之軸套構件11;固接於此軸套構 件11之旋轉圓板12;能夠於外周部轉動自如地支撐於旋 轉圓板12之複數個割刀體13;以及固定於旋轉圓板12的 上面側之複數個擴散葉片14而構成。 旋轉圓板12，係以從與軸套構件11的固定部往外方 © 側緩緩地縮小與地面之間的距離之方式，成形爲往外方下 方傾斜之朝下皿狀，且於外周部形成有與地面大致呈水平 之水平部1 2a。割刀體1 3係藉由：成形爲往斜向外方側上 方傾斜之形狀之上側割刀體1 3 a ;以及成形爲往斜向外方 側下方傾斜之形狀之下側割刀體1 3b所構成，上側割刀體 1 3 a及下側割刀體1 3 b係交互地以大約90度的等間距，藉 由銷15能夠轉動自如地支撐於旋轉圓板12的外周部之水 平部12a的複數處。 〇 擴散葉片14,係以隨著朝向外方側逐漸擴大葉片的面 積之方式，成形爲往斜向外方上方傾斜之形狀，並且以大 約90度的等間距，以放射狀來配置從軸心P2互爲鄰接之 割刀體1 3的中間位置。 於傳動箱體7的下部，裝設有割刀蓋16，藉由此割刀 蓋1 6，可阻止割草往旋轉中心側進入，並防止割草纏繞於 旋轉中心而構成。 [步行式割草機的傳動構造] -19- 200936035 以下根據第9圖〜第12圖，說明步行式割草機的傳動 構造。第9圖係顯示步行式割草機之傳動系統圖，第1〇 圖及第11圖分別顯示步行式割草機的傳動構造之縱剖面 背視圖及橫剖面俯視圖。此外，第1 2圖係顯示割刀離合 器68之立體圖。 如第9圖〜第11圖所示，上下方向的輸入軸62，係夾 介一對的軸承61可轉動自如地支撐於傳動箱體7的上部 ❹ ，此輸入軸62的上端部，係夾介主離合器63連結於傳動 箱體7的上部所固定之發動機8的輸出軸8c。傳動齒輪 64係能夠一體地轉動而連結於輸入軸62的下部，此傳動 齒輪64,係咬合於與後述的上部傳動軸65連動連結之傳 動齒輪72。 以同心狀配置於傳動箱體7之上下方向的軸心P2的 周圍之上部傳動軸65及下部傳動軸66，係夾介複數個軸 承67可轉動自如地支撐，並且涵蓋上部傳動軸65及下部 # 傳動軸66而裝設有割刀離合器68。於下部傳動軸66的下 端，係從下方側鎖緊固定有割刀1〇的軸套構件11，當操 作割刀離合器68至進入側時，來自發動機8的動力，經 由輸入軸62、上部傳動軸65及割刀離合器68被傳達至下 部傳動軸66，並且使割刀1〇旋轉而構成。 如第10圖及第12圖所示，割刀離合器68係具備： 連動連結於上部傳動軸65之上部離合器69;以及能夠一 體地轉動且可藉由栓槽構造上下地滑動移動而外嵌於下部 傳動軸66之下部離合器70而構成’於上部離合器69及 -20- 200936035 下部離合器70，分別形成有互相卡合之卡合片69a、70a ο 涵蓋下部離合器7〇的下面側及軸承67的上面側，裝 設有將下部離合器70往上方彈壓之彈性彈簧68a，藉由此 彈性彈簧68a，可將割刀離合器68彈壓至進入側而構成。 於卡合片69a、70a，形成有斜向傾斜之傾斜部69b、 7 0b，在來自發動機8的動力經由上部傳動軸65被傳達至 〇 下部傳動軸66之狀態下，上部離合器69的卡合片69a與 下部離合器70的卡合片7 0a互相嚙合，使來自發動機8 的動力被傳達至下部傳動軸66。 例如，在停止發動機8使上部傳動軸65的旋轉停止 之狀態下，割刀1 〇因慣性力而旋轉，當來自割刀1 〇的慣 性力即將從下部傳動軸66傳達至上部傳動軸65時，係藉 由卡合片69a、70a的傾斜部69b、70b，使下部離合器70 相對於上部離合器69旋轉滑動，而阻止來自下部傳動軸 ® 66的慣性力被傳達至上部的上部傳動軸65。當由割刀10 的慣性力所形成之旋轉停止時，係藉由彈性彈簧68a的彈 推力，將下部離合器70往上方操作，而操作割刀離合器 68至進入側。 藉此，不僅可防止割刀10的慣性力往傳動上游側（ 發動機8側及擺動支軸7 b側）連動旋轉（例如因割刀1〇 的慣性力使前輪5及後輪6轉動）等，並且，相較於例如 將強制地制動割刀10的旋轉之煞車裝置等（圖中未顯示 )裝設於割刀10的傳動上游側，來構成爲當停止發動機8 -21 - 200936035 時由割刀1 〇的旋轉所形成之慣性力不會傳達至傳動上游 側之情況’可簡化用以抑制來自割刀1 0的慣性力往傳動 上游側的傳達之機構，而降低製造成本。 下部離合器70’亦以具有割刀離合器68的移位構件 之功能之方式，於下部離合器70下部的外周部形成有移 位溝7〇c，繞前後方向的軸心周圍能夠左右擺動地支撐之 移位搖桿71的操作部70a，係卡合於此移位溝70c，當擺 動操作移位搖桿71的的搖桿本體71a時，下部離合器70 係往上下滑動移動，使割刀離合器68可進行離合而構成 〇 如第9圖〜第1 1圖所示，傳動齒輪72、73係連動連 結於上部傳動軸65，傳動齒輪72係咬合於輸入軸62上所 固定之傳動齒輪64。傳動齒輪75係連動連結於可轉動自 如地支撐於傳動箱體7之前後方向的傳動軸74，此傳動齒 輪75係咬合於與上部傳動軸65連動連結之傳動齒輪73, Ο 來自上下方向的上部傳動軸65之動力，被變更90度的角 度並被傳達至前後方向的傳動軸74而構成。傳動齒輪76 係連動連結於傳動軸74，此傳動齒輪76係配置於傳動軸 74的右下側，並咬合於與傳動軸77連動連結之傳動齒輪 78 ° 傘齒輪79係連動連結於傳動軸77，此傘齒輪79咬合 於外嵌入左右方向的驅動軸7a之前進用傘齒輪80及後退 用傘齒輪81。驅動軸7a，係夾介軸承83可繞左右方向的 軸心P1的周圍轉動自如地支撐於傳動箱體7，前進用及 -22- 200936035 後退用傘齒輪80、81轉動自如地外嵌於此驅動軸7a。移 位構件82，可於左右方向滑動移動、且能夠與驅動軸7a 一體地轉動而外嵌於前進用傘齒輪80與後退用傘齒輪81 之間。 操作軸84，可繞上下方向的軸心周圍轉動自如地支撐 於傳動箱體7，操作臂85及上下的操作構件86係連結於 此操作軸84的上端部及下端部。於移位構件82的外周部 ❹ 形成有移位溝82a，連結於操作軸84之操作構件86，係 卡合於此移位溝82a。當操作操作臂85往前後擺動時，移 位構件82往左右方向滑動移動而嚙合於前進用傘齒輪80 或後退用傘齒輪81，而構成爲可進行行走機體1的前進、 停止（中立）、後退之切換。如此，藉由傘齒輪79、前進 用傘齒輪80、後退用傘齒輪81、移位構件82等，而構成 前進後退離合器87。 如第1圖及第2圖所示，操作臂85係銜接於操縱把 〇 手21上所裝設之前進後退切換搖桿26，當操作前進後退 切換搖桿26往前進側（左側）擺動時，操作臂85往後方 擺動操作使移位構件82咬合於前進用傘齒輪80，使前進 後退離合器87被操作爲進入前進側，來自傘齒輪79的動 力，係經由前進用傘齒輪80及移位構件82被傳達至驅動 軸7a，使驅動軸7a正向旋轉地被驅動。另一方面，當操 作前進後退切換搖桿26往後退側（右側）擺動時，操作 臂85往前方擺動操作使移位構件82咬合於後退用傘齒輪 81 ’使前進後退離合器87被操作爲進入後退側，來自傘 -23- 200936035 齒輪79的動力，係經由後退用傘齒輪81及移位構件82 被傳達至驅動軸7a，使驅動軸7a逆向旋轉地被驅動。 如第9圖〜第11圖所示，鏈條傳動機構9的驅動鏈輪 41係連動連結於驅動軸7a的右端部，來自驅動軸7a的動 力，係經由鏈條傳動機構9被傳達至前部車軸3及後部車 軸4,使前輪5及後輪6正向逆向旋轉而使行走機體1前 進或後退。 〇 [割草高度調節機構的詳細構造] 以下根據第3圖及第4圖，說明割草高度調節機構90 (相當於傾斜角度調節機構）的詳細構造。如第3圖及第 4圖所示，涵蓋鎖緊固定於左方主框32的後部上面側之托 架91、及鎖緊固定於傳動箱體7的左側部之板狀的托架 92，將銜接桿93予以銜接，藉此來構成限制割草高度的 下限範圍之割草高度調節機構90。 〇 托架91係將板狀材彎折成形爲L字狀而構成，在從 與左方主框32的固定部分往上方延伸出之部分，加工形 成有3個調節孔91A、91B、91C。上側的調節孔91A係成 形爲圓孔，中央的調節孔91B及下側的調節孔91C，分別 成形爲前後較長的長孔。並以後述之割草高度H1、H2、 H3爲大致相等的間隔之方式，設定調節孔9 1 B、9 1 C緩慢 增長。 銜接桿93的前端部及後端部，係分別成形爲往內方 側及外方側彎折之形狀，並將銜接桿93的前端部銜接於 -24- 200936035 托架92上部之左右方向的貫通孔，並將銜接桿93 部銜接於托架91的調節孔91A、91B、91C當中任 94’藉此’可限制傳動箱體7等繞左右方向的軸心 周圍之擺動範圍的上限而構成。 當將銜接桿93的後端部銜接於調節孔91A時 制傳動箱體7繞左右方向的軸心pi的周圍之擺動 驅動發動機8使割刀1〇旋轉，割刀1〇下端部的高 Q 持在Η 1不變。 當將銜接桿93的後端部銜接於調節孔91Β時 調節孔91Β的長孔範圍內容許銜接桿93之後端部 ，而在調節孔91Β的長孔範圍內容許傳動箱體7等 方向的軸心Ρ1的周圍往前方及後方擺動。例如當 動機8將前進後退切換搖桿26操作至前進側時， 傳動箱體7的下端部之割刀10，係從與地面大致呈 高度Η1，於調節孔9 1 Β所容許的範圍內傾斜。之 〇 接桿93的後端部接觸於調節孔91Β的前端，使割7： 下端部的高度自動變更爲高度Η2，並維持在此高度 當將銜接桿93的後端部銜接於調節孔91C時 調節孔91C的長孔範圍內容許銜接桿93之後端部 ，而在調節孔91C的長孔範圍內容許傳動箱體7等 方向的軸心Ρ1的周圍往前方及後方擺動。例如當 動機8將前進後退切換搖桿26操作至前進側時’ 傳動箱體7的下端部之割刀1〇’係從與地面大致呈 高度Η1，於調節孔9 1 C所容許的範圍內傾斜。之 的後端 一個銷 Ρ1的 ，係限 ，即使 度仍維 ，係在 的移動 繞左右 驅動發 連結至 水平的 後，銜 ，10之 Η2。 ，係在 的移動 繞左右 驅動發 連結至 水平的 後，銜 -25- 200936035 接桿93的後端部接觸於調節孔91C的前端，使割刀10之 下端部的高度自動變更爲高度H3，並維持在此高度H3。 此外，當停止發動機8或是將前進後退切換搖桿26 操作至停止側（中立側）時，割刀10的高度自動變更爲 與地面大致呈水平的高度H1。 如上述般，藉由構成割草高度調節機構90，可裝卸銷 94來變更銜接桿93的後端部往調節孔91A、91B、91C之 〇 銜接位置，藉此可變更傳動箱體7的擺動範圍，並將割刀 10之下端部的高度變更調節爲HI' H2、H3的3階段，而 在3階段中變更調節割刀10的割草高度（後述之割刀10 的前降傾斜角度α (後降傾斜角度））。 [割刀之傾斜狀況的說明] 以下根據第13圖及第14圖，說明割刀1 0的傾斜狀 況。第1 3圖係說明使行走機體1前進之前降傾斜姿勢下 〇 之割刀1 〇的傾斜狀況，第14圖係說明使行走機體1後退 之後降傾斜姿勢下之割刀1 0的傾斜狀況。 如第13圖所示，當從割刀10未旋轉之與地面大致呈 水平的狀態，切換至驅動發動機8將前進後退切換搖桿26 操作至前進側時，驅動軸7a以第1 3圖的黑色箭頭所示之 順時針方向繞左右方向的軸心P1的周圍旋轉。當驅動軸 7a往順時針方向旋轉時，由於力的作用反作用法則，與第 13圖的黑色箭頭所示之驅動軸7a所旋轉的方向爲相反之 逆時針方向的力，係作用於傳動箱體7。當逆時針方向的 -26- 200936035 力作用於傳動箱體7時，使傳動箱體7、連結於傳動箱體 7之發動機8、及割刀10，一體地繞左右方向的軸心P1 的周圍往前方擺動，並藉由割草高度調節機構90來限制 擺動範圍（於第13圖中，將割草高度設定在H3時）’使 傳動箱體7、發動機8、及割刀10成爲較水平時更往前方 傾斜降低角度α之狀態。 另一方面，如第14圖所示，當從割刀1〇未旋轉之與 〇 地面大致呈水平的狀態，切換至驅動發動機8將前進後退 切換搖桿26操作至後退側時，驅動軸7a以第14圖的黑 色箭頭所示之順時針方向繞左右方向的軸心P 1的周圍旋 轉。當驅動軸7a往順時針方向旋轉時，由於力的作用反 作用法則，與第14圖的黑色箭頭所示之驅動軸7a所旋轉 的方向爲相反之逆時針方向的力，係作用於傳動箱體7° 當逆時針方向的力作用於傳動箱體7時，使傳動箱體7、 連結於傳動箱體7之發動機8、及割刀10，一體地繞左右 ❹ 方向的軸心P1的周圍往後方擺動，並藉由割草高度調節 機構90來限制擺動範圍（於第14圖中，將割草高度設定 在H3時），使傳動箱體7、發動機8、及割刀10成爲較 水平時更往後方傾斜降低角度α之狀態。 亦即，當驅動發動機8將前進後退切換搖桿26切換 至前進側或後退側，使行走機體1前進或後退時，割刀1 〇 可自動地擺動至自動由割草高度調節機構90所設定之割 草高度，並在預先由割草高度調節機構90所設定之割刀 1 〇的割草高度來進行割除作業。 -27- 200936035 如上述般，藉由使割刀1 〇傾斜爲前降傾斜或後降傾 斜來割除草，使割刀1 0呈前降傾斜或後降傾斜之下端部 (前端部或後端部）最接近於草（地面）的位置，隨著從 該位置朝向相對於行走方向爲相反方向，使割刀1 〇與通 過割刀1 〇的下側之草（地面）之間的間隙逐漸增大。結 果可縮小割刀1 0的下面側與通過割刀1 0的下側之草（地 面）之間的接觸面積，使來自作用於割刀1 〇的下面側之 0 割除草（地面）的阻力減低，而降低割除草時作用於割刀 1 〇之負擔。 其結果爲，相較於例如使割刀1 0以與地面大致呈水 平的狀態來割除草而構成之情況，可降低使割刀1 〇驅動 旋轉的動力（割除草的動力），實現發動機8的小型化及 輕量化（例如一邊確保割除草的能力，並設定爲馬力較小 的發動機），而實現步行式割草機的輕巧化及輕量化。 φ [發明之實施的第1其他形態] 於上述實施形態中，係顯示繞左右方向的軸心Ρ1的 周圍能夠擺動地支撐從行走機體1的傳動箱體7所延伸出 之驅動軸7a及擺動支軸7b，並且以將割刀10變更姿勢爲 前降傾斜姿勢及後降傾斜姿勢之方式來構成傾斜姿勢變更 機構之例子，但只要可將割刀1 0以繞左右軸心的周圍能 夠擺動地支撐於行走機體1者，亦可採用不同的構成。 具體而言，例如可採用將割刀1 0以繞左右軸心的周 圍能夠擺動地支撐於傳動箱體7的下部之構成（圖中未顯 -28- 200936035 示），或是與發動機8及傳動箱體7不同，另外將割刀10 以繞左右軸心的周圍能夠擺動地支撐於機體框2之構成（ 圖中未顯示）。 [發明之實施的第2其他形態] 於上述實施形態中，係顯示使來自驅動軸7a的動力 ，經由鏈條傳動機構9被傳達至前輪5及後輪6而構成之 〇 例子，但亦可爲使來自驅動軸7a的動力，經由不同的傳 動機構被傳達至前輪5及後輪6之構成，例如可採用V皮 帶或正時皮帶等之皮帶傳動機構（圖中未顯示），或是採 用驅動轉軸（圖中未顯示）。 於上述實施形態中，係顯示藉由涵蓋托架91及托架 92將銜接桿93予以銜接來構成割草高度調節機構90之例 子，但亦可採用不同的機構作爲割草高度調節機構90，例 如將用以限制進行擺動之發動機8或傳動箱體7之擺動範 © 圍的上限之限制件（圖中未顯示），設置於機體框2側， 來構成割草高度調節機構90。 於上述實施形態中，係顯示以在3階段中變更調節割 刀10的割草高度之方式來構成割草高度調節機構90之例 子，但亦可以在不同階段中（例如爲2階段般之較少階段 ，或是4階段、5階段般之較多階段）變更調節割刀1〇的 割草高度之方式來構成割草高度調節機構90。此外，亦可 爲非階段性地變更調節割刀1〇的割草高度’而是能夠以 無階段方式進行變更調節之方式來構成割草高度調節機構 -29- 200936035 90，藉由此構成，可進行割刀10的割草高度之微調，而 更進一步提升割除作業的作業性。 具體而言，例如可將用以限制進行擺動之發動機8或 傳動箱體7之擺動範圍的上限之限制件（圖中未顯示）， 設置於不擺動的機體框2側，並藉由調節此限制件，以無 階段方式來限制發動機8或傳動箱體7的擺動範圍的上限 ，而構成割草高度調節機構90。 ❹ [發明之實施的第3其他形態] 亦可採用棒狀刮刀（圖中未顯示），來取代上述實施 形態的割刀1 〇。 於上述實施形態中，係顯示採用前輪5及後輪6作爲 行走裝置之例子’但亦可採用配置3個輪子之3輪行走規 格（圖中未顯示）、或是履帶行走裝置（圖中未顯示）來 取代前輪5及後輪6。 〇 於上述實施形態中，係顯示以來自發動機8的動力來 驅動前輪5及後輪6而構成之例子，但亦可以前輪5或後 輪6爲轉動輪，並以來自發動機8的動力來驅動前輪5或 後輪6，而構成步行式割草機。 於上述實施形態中’係顯示採用發動機8作爲原動力 部E之割草機之例子，但亦可採用不同構成作爲原動力部 E’例如可採用藉由電池或商用電源等的電力進行驅動之 電動馬達（圖中未顯示），來取代發動機8。 於上述實施形態中，係顯示將發動機8連動連結於傳 • 30 - 200936035 動箱體7的上部而構成原動力部E之例子，但亦可採用一 體地構成傳動箱體7及發動機8而成之原動力部E (圖中 未顯示）。此外，亦可省略傳動箱體7而簡單地僅以發動 機8來構成原動力部E (圖中未顯示）。此時，係使左右 方向的驅動軸及擺動支軸從發動機8往行走裝置（車輪等 )延伸出，使朝下的傳動軸從發動機8的下部往割刀10 延伸出，並使發動機8繞左右軸心的周圍能夠擺動地支撐 〇 於機體框2(圖中未顯示）。 [發明之實施的第4其他形態] 於上述實施形態中，係顯示藉由涵蓋托架91及托架 92將銜接桿93予以銜接來構成割草高度調節機構90之例 子，但亦可採用不同的機構作爲割草高度調節機構90，例 如將用以限制進行擺動之發動機8或傳動箱體7之擺動範 圍的上限之限制件（圖中未顯示），設置於機體框2側， 〇 來構成割草高度調節機構90。 於上述實施形態中，係顯示以在3階段中變更調節割 刀10的割草高度之方式來構成割草高度調節機構90之例 子，但亦可以在不同階段中（例如爲2階段般之較少階段 ，或是4階段、5階段般之較多階段）變更調節割刀10的 割草高度之方式來構成割草高度調節機構90» 此外，亦可爲非階段性地變更調節割刀10的割草高 度，而是能夠以無階段方式進行變更調節之方式來構成割 草高度調節機構90，藉由此構成，可進行割刀10的割草 -31 - 200936035 高度之微調，而更進一步提升割除作業的作業性。 具體而言，例如可將用以限制進行擺動之發動機8或 傳動箱體7之擺動範圍的上限之限制件（圖中未顯示）， 設置於不擺動的機體框2側，並藉由調節此限制件，以無 階段方式來限制發動機8或傳動箱體7的擺動範圍的上限 ，而構成割草高度調節機構90。 © [發明之實施的第5其他形態] 於上述實施形態中，係顯示當驅動發動機8將前進後 退切換搖桿26切換至前進側或後退側，使行走機體1前 進或後退時，割刀10可自動地擺動至由割草高度調節機 構90所設定之割草高度而構成步行式割草機之例子，但 亦可使傳動箱體7、發動機8及割刀10等能夠於前後方向 一體地擺動而支撐於行走機體1，並將割刀10固定於由割 草高度調節機構90所設定之角度（例如將銜接桿93固定 Φ 於托架91的複數處），藉此，不論使行走機體1前進或 後退，均可顯現出使割刀10擺動至預先設定的割草高度 之前降傾斜姿勢（或後降傾斜姿勢）來構成步行式割草機 [發明之實施的第6其他形態] 於上述實施形態中，係顯示將步行式割草機構成爲可 前進後退，並且可使割刀10的前降傾斜角度及後降傾斜 角度變更調節自如地構成割草高度調節機構90之例子， -32- 200936035 但亦可將步行式割草機構成爲僅可前進（或後退）’或者 是僅能夠使割刀10的前降傾斜角度（或後降傾斜角度） 變更調節自如地構成割草高度調節機構90。此外’亦能夠 以使前進時與後退時的割草高度成爲不同之方式’來構成 割草高度調節機構90。 【圖式簡單說明】 第1圖係顯示步行式割草機之全體左方側視圖。 第2圖係顯示步行式割草機之全體俯視圖。 第3圖係顯示行走機體之縱剖面左方側視圖。 第4圖係顯示行走機體之橫剖面俯視圖。 第5圖係顯示行走機體之縱剖面背視圖。 第6圖係說明前輪及後輪的支撐構造之縱剖面背視圖 〇 第7圖係說明可動飛散防止蓋的構造之縱剖面側視圖 〇 第8圖係說明割刀的構造之橫剖面俯視圖。 第9圖係顯示步行式割草機之傳動系統圖。 第10圖係顯示步行式割草機的傳動構造之縱剖面背 視圖。 第11圖係顯示步行式割草機的傳動構造之橫剖面俯 視圖。 第12圖係顯示割刀離合器之立體圖。 第13圖係說明於前進時之割刀的傾斜狀況之槪略右 -33- 200936035 方側視圖。 第1 4圖係說明於後退時之割刀的傾斜狀況之槪略右 方側視圖。 【主要元件符號說明】 1 :行走機體 5 :前輪（行走裝置） φ 6 :後輪（行走裝置） 7a :驅動軸 7b :擺動支軸 1 〇 :割刀 90 :割草高度調節機構（傾斜角度調節機構） E :原動力部 P1 :軸心（左右軸心） P2 :軸心（上下軸心） φ α :前降傾斜角度，後降傾斜角度 -34-200936035 IX. [Technical Field] The present invention relates to, The motive part is provided in the traveling body, And a walking mower that is rotated by the power from the motive power unit and the cutter. [Prior Art] © As a prior art, For example, Japanese Patent Publication No. 2007_5 3 99 1 (hereinafter referred to as "Patent Document 1") is disclosed. The engine (5 in the first drawing of Patent Document 1) is mounted on a traveling body including a traveling wheel (4 of the first drawing of Patent Document 1). A walking mower having a cutter that is rotated by the power of the engine (2 of the first drawing of Patent Document 1) is provided. SUMMARY OF THE INVENTION ® (Problems to be Solved by the Invention) In the walking lawn mower of Patent Document 1, The pedestal (66 of Fig. 13 of Patent Document 1) and the blade (67 of Fig. 13 of Patent Document 1) are substantially parallel to the ground. The cutter is attached to the lower portion of the drive housing (9 of Fig. 13 of Patent Document 1), When moving the walker mower forward, The grass introduced from the front is cut off by the front of the cutter. When the walker mower is retracted, The grass introduced from the rear is cut off by the back of the cutter. therefore, Even if the part of the cutter that is actually used for mowing is the front -5-200936035 or the rear of the cutter, Whether moving the walker mower or moving the walker mower back, The underside of the cutter covers the entire area, The system is located close to the ground. Therefore, the grass that exists on the ground after cutting off the lower side of the knife, It is easy to cause resistance to the rotation of the cutter. As a result, the burden on the engine used to drive the cutter increases. From the standpoint of miniaturization of the engine and weight reduction of the walking mower, There is still room for improvement. The object of the present invention is to enable a simple construction, To perform a cutting operation when the traveling body is advanced and a cutting operation when the traveling body is retracted. A walking mower that saves the power of turning the cutter. (Means for Solving the Problem) The characteristic constitution of the present invention, For walking in the body, With the motive power department, And in the walking lawn mower that is rotated by the power from the motive power unit and the cutter: Make the aforementioned cutter, Rotating around the upper and lower axes, And around the left and right ® axis around the shaft can swing support to the aforementioned traveling body; And has: When the aforementioned traveling body is advanced, The posture of the front side of the cutter is changed to a downward tilting posture before swinging downward. When the aforementioned traveling body is retracted, The rear side changing posture of the cutter is a tilt posture changing mechanism that swings downward and then tilts down. According to the above composition, By advancing the body (backward), The grass introduced from the front can be cut off by changing the front position (rear) of the cutter in the forward tilt posture (rear down tilt posture). at this time, Even if the cutter is in a forward tilting posture (rearing tilting posture), Since the part of the cut grass is the front side (rear side) of the cut -6- 200936035, Therefore, the grass introduced from the front (rear) can be cut off without hindrance. In the forward tilting posture (rearing tilting posture), 'because the rear side (front side) of the cutter is far from the top, Therefore, it is difficult to reduce the load on the motive part for driving the cutter by the fact that the grass on the lower side of the cutter is less likely to cause resistance to the rotation of the cutter. Therefore, the cutting operation when the traveling body is advanced and the cutting operation when the traveling body is retracted can be performed, and the output of the motive unit that drives the cutting blade can be set small, and the power for rotating the cutter can be saved. In addition, Since the cutter is supported by the traveling body around the circumference of the left and right axes, and so, By swinging the cutter to the traveling body, the forward tilting posture and the backward tilting posture of the cutter can be easily expressed. The result is that It is easy to switch between the forward tilt posture and the backward tilt posture of the cutter. The structure of the tilt posture changing mechanism is simplified. As above, As a result, the miniaturization of the motive power unit and the weight reduction of the walking mower can be achieved. And reduce the manufacturing cost of the walking mower. © in the above composition, Preferably, the cutter is rotatably supported around the upper and lower axes (P2) in a lower portion of the motive power unit, Further, the motive power unit is swingably supported by the traveling body around the left and right axis centers. The tilt posture changing mechanism is configured as described above. According to this configuration, By swinging the motive part around the left and right axes, the body is swung, The cutter can be oscillated integrally with the motive part around the left and right axes to the traveling body. It is easy to show the forward tilting posture and the backward tilting posture of the cutter. In addition, For example, when only the cutter is swung around the left and right axes, The connection structure between the cutter and the motive part may become -7-200936035 Complicated' but by swinging the motive part and the cutter integrally around the left and right axes, It can prevent the connection structure between the cutter and the motive power unit from changing. The result is that it is easier to switch the forward tilting posture and the backward momentum of the cutter. The structure of the tilt posture changing mechanism is more simplified as described above. As a result, the walking mower can be further quantified. And the manufacturing cost of the walking mower can be reduced. In the above composition, It is preferable to be from the front part of the motive power unit, a power transmission device from the aforesaid motive power unit is driven to the right and left by a concentric circular drive shaft and a swing support shaft via the drive shaft; Making the aforementioned drive shaft and the swing support shaft, Rotatingly supported on the traveling body around the left and right axes, It constitutes the aforementioned tilting mechanism. According to this configuration, When the traveling body is advanced (retracted) by the power from the motive power unit, Because of the force, The force acting in the opposite direction to the direction of rotation of the drive shaft ® Swing the motive part and the cutter integrally, While changing the posture, the front side (rear side) swings downward and tilts down (post-down). The result is that Can effectively utilize the force of driving the walking device, And the cutter is automatically changed to the posture of the forward tilting posture, the oblique posture), And by changing the walking direction of the walking body, Switch the front tilt posture and the backward tilt posture. in particular, As shown in Figure 13, When the traveling body drive shaft (7a of Fig. 13) is rotated clockwise around the left and right axes (P1 of Fig. 13), The reaction around the heart is complicated by the action of the force. Lowering the tilting position 〇 One step lightly extending from the left and right sides, Achieving the above-mentioned heart's surrounding oblique position-changing driving shaft-rotating reaction method is the habit of the original power generated by the inclined posture of the cutting blade (the rear descending tilt can automatically advance and the surrounding law of the heart makes the drive-8 - 200936035 the moving shaft counterclockwise The force of rotation about the circumference of the left and right axes, Acting on the prime mover (E in Fig. 13), the main power unit and the cutter (10 in Fig. 14) are swung back. The change posture is that the front side of the cutter is tilted downward before swinging downward. In addition, As shown in Figure 14, When the traveling body is retracted and the drive shaft is rotated counterclockwise around the left and right axes, The force of action of the force causes the drive shaft to rotate around the left and right axes in a clockwise direction, Acting on the motive part (E φ in Figure 14), Move the motive power unit and the cutter (10 in Figure 14) back to the body. On the other hand, the rear side of the cutting blade (10 of Fig. 14) is swung downward and then tilted. As above, As a result, the front tilt posture and the backward tilt posture can be switched simply and quickly. Improve the workability of the cutting operation, Further, the structure of the tilt posture changing mechanism can be simplified. In the above composition, It is preferable to have a tilt angle adjustment mechanism, It can change the front tilt angle of the cutter under the aforementioned forward tilt posture © , Or the angle of the backward tilt of the cutter under the aforementioned backward tilting posture. According to this configuration, The tilt angle adjustment mechanism is used to change the forward tilt angle and the backward tilt angle of the cutter. Thereby changing the height of the cutter, Adjusting the tilt angle adjustment mechanism according to the length of the grass, Cut longer or shorter grass. The result simplifies the mechanism for changing the mowing height of the grass. The number of parts of the mechanism that reduces the mowing height of the grass. As above, As a result, it is possible to change the mowing height of the grass' and to reduce the manufacturing cost of the walking mower to a low level. In addition, Other characteristic configurations of the present invention, In order to walk in the body -9 - 200936035 with the motive power, And the cutter is rotatably connected around the upper and lower axes to the walking mower in the lower part of the motive part: Supporting the motive power unit to the traveling body around the circumference of the left and right axes, So that the front side of the cutter is tilted downward before swinging downward; Further, by changing the posture of the motive part and the cutter integrally around the left and right axes, The forward descending angle of the cutter in the forward tilting posture is configured to be changeable. © According to this composition, When the motive power unit and the cutter are integrally changed around the left and right axis, the posture is changed. To change the forward tilt angle of the cutter in the forward tilting posture, The height of the front side of the cutter can be changed, It is possible to change the height of the front side of the cutter which cuts the grass introduced from the front. at this time, Even if the cutter is tilted forward, Since the part of the cut grass is the front side of the cutter, Therefore, it is possible to cut off the grass introduced from the front without hindrance. In addition, In the forward tilting posture, Since the back side of the cutter is far from the top, and so, Passing the grass on the underside of the cutter is not easy to cause resistance to the rotation of the cutter. This reduces the burden on the ® prime mover that drives the cutter. With this, By changing the position of the motive power unit and the cutter around the circumference of the left and right axes, Adjusting the mowing height of the grass carried by the cutter, It is not necessary to have a mechanism for sliding the cutter up and down, for example. In addition, For example, when only the cutter is changed around the left and right axes, The connection between the cutter and the motive part may become complicated. However, by changing the position of the motive part and the cutter around the left and right axes, It prevents the connection structure between the cutter and the motive power unit from becoming complicated. The result is that It also simplifies the mechanism for changing the mowing height of the grass. It is possible to reduce the number of parts of the mechanism for changing the mowing height of the grass -10-200936035. As above, As a result, the weight and low cost of the walking lawn mower can be achieved. For example, the workability of the cutting operation by the walking lawn mower or the handling operation of the step mower is improved. [Embodiment] [Entire structure of a walk-behind mower] 〇 In accordance with the first to sixth figures, The overall structure of the walking mower will be described. Fig. 1 and Fig. 2 respectively show the left side view and the entire top view of the walker mower. Figures 3 to 5 show the walking body separately! Side view of the left side of the longitudinal section, Cross-sectional top view and longitudinal section back view. Fig. 6 is a longitudinal sectional rear view showing the support structure of the front wheel 5 and the rear wheel 6. As shown in Figures 1 and 2, Installed in the body frame 2 of the traveling body 1, The pivot support has a front axle 3 and a rear axle 4, The left and right ends of the front axle 3 and the rear axle 4, Fixed front wheel with sheet metal 5 5 © and rear wheel 6, 6 (equivalent to walking device). The transmission case 7 is rotatably supported on the upper portion of the body frame 2 around the axis P1 of the right and left directions. An engine 8 integrally formed with a fuel tank 8a, Linked to the upper part of the transmission case 7, It constitutes the motive part E. A rebound type starter 8b is mounted in the engine 8, It can be constructed by driving the engine 8 by the starter 8b. On the right side of the body 1, It is equipped with a chain transmission mechanism 9, From the power of the engine 8, It is transmitted to the chain transmission mechanism 9 via a communication path in the transmission case 7. The front axle 3 and the rear axle 4 are rotated to rotate the front wheel 5 and the rear wheel 6 around -11 - 200936035. A cutter 10 is mounted on a lower portion of the transmission case 7, Power from the engine 8, It is transmitted to the cutter 1 via the communication path in the transmission case 7. The cutter can be mowing by rotating the cutter 1 turn. As shown in Figures 4 and 5, In the upper part of the body frame 2, A frame 18 having a U shape in a plan view is fixed. At the end of the frame 18 extending from the body frame 2 to the left side, The support shaft 19 is rotatably supported around the axis of the vertical direction. At the upper end of the support shaft 19, The bracket 20 is rotatably supported around the axial center 〇 of the lateral direction, In this bracket 20, A tubular manipulation handle 2 1 is fixed. As shown in Figures 1 and 2, The steering handle 21 is configured to be swingable and displaceable around the axis in the up and down direction. And by the action of the first locking mechanism 22 provided between the frame and the frame 18, It is possible to selectively fix a plurality of swing positions around the axis center which is set in the upper and lower directions in advance, And by the action of the second locking mechanism 23 provided between the frame 18 and It is possible to selectively fix the plurality of swing positions held around the axis of the preset lateral direction. At the extended end of the handle 21, A grip portion 21a is mounted, Here, the grip portion 21a, A first release rocker 24 for unlocking the first lock mechanism 22 in which the biasing force is locked is attached, And a second release rocker 25 that can perform a lock release operation on the second lock mechanism 23 in which the bias pressure is locked. And respectively connected to the first and second locking mechanisms 22, 23 ° at the extended end of the operating handle 21, The main clutch rocker 21b is rotatably mounted around the axial center. And it is connected with the main -12-200936035 clutch 63 which will be described later. Further, it is configured to stop the rotation of the cutter 10 and stop the traveling body 1. At the rear end of the handle 21, Make it switchable to the forward position, Neutral position, Before the retreat position, the forward and backward switching rocker 26 is supported to swing around the axis around the up and down direction, The forward/reverse switching rocker 26 is coupled to an operating arm 85, which will be described later. Further, the forward position of the walking mower can be performed by the operation of the forward/reverse switching rocker 26, Stop (medium) Switch back. As shown in Figure 3, Figure 4, As shown in Figure 6, The body frame 2 has: The main frame 31 on the right and left sides of the front and rear 32; Covering the right and left main frame 31, The front end frame 33 of the front end portion of 32 is provided; And the main frame 31 covering the right and left sides, The rear end portion 32 of the 32 is provided with a rear frame 34 to constitute a front and rear frame 33, 34, It is made up of cylindrical members. Further, the left and right bearing members 37, which are sandwiched between the right and left front axles 3', are movably fitted in the front frame 33, The rear axle 4 in the left and right direction, The left and right bearing members 38 are rotatably embedded in the rear frame 34 涵盖 covering the right and left main frames 31, The front end of 32, It is provided to protect the front front link 35' of the traveling body 1 from the right and left main frames 31, The rear end of 32, A rear rear link 36 is provided to protect the traveling body 1. As shown in Figures 3 to 5, The drive shaft 7a extends from the transmission case 7 to the right. The drive shaft 7a is a sandwich bearing member 39, It can rotate -13- 200936035 to support the main frame 31 on the right side freely. a swinging support shaft 7b concentric with the drive shaft 7a, It extends from the transmission case 7 to the left. The swinging support shaft 7b is a sandwich bearing member 40, The main frame 32 on the left side is rotatably supported around the axis P1 in the left-right direction. With this, Can make the transmission case 7, Engine 8, And the cutter 10, etc. Around the axis P1 around the left and right direction, It can be integrally and oscillated back and forth to be supported by the body frame 2. The position of the drive shaft 7a and the swing support shaft 7b in the left-right direction of the axial center P1 in the front-rear direction, The transmission case 7 is supported by the drive shaft 7a and the swing support shaft 7b. Engine 8, And the cutter 10 etc. in the vicinity of the center of gravity in the front and rear directions, In a state in which the drive shaft 7a is stopped and the inertial force does not act on the transmission case 7 or the like, The cutter 1 is maintained at a level that is approximately level with the ground. Further, in a state in which the inertia force is applied to the transmission case 7 or the like by the rotation drive shaft 7a, The inertial force formed by the rotation of the drive shaft 7 a, The force around the axis P1 formed by the weight of the transmission case 7 or the like is large, The cutter is changed to a forward tilting posture. The potential and the backward tilt posture (refer to Fig. 13 and Fig. 14). As shown in the third to sixth figures, the right side of the right main frame 31 is outside. A chain transmission mechanism 9 is mounted. The chain transmission mechanism 9 has: Coupling the drive sprocket 41 coupled to the right outer end of the drive shaft 7a; Linking to the front outer sprocket 42 of the right outer end of the front axle 3; Linked to the rear outer sprocket 43 of the right outer end of the rear axle 4; a tension sprocket 44 disposed at an upper portion of the drive sprocket 41; And covering the drive sprocket 41, Front and rear sprocket 42 43 and the tension sprocket 44 are wound around the laid drive chain 45. On the right side of the right main frame 31, there is a chain of left and right divided into two -14 - 200936035 cover 46, Fixing the left chain cover 46a to the right main frame 31, And the right chain cover 46b is locked and fixed to the left chain cover 46a from the right outer side. With this, The chain drive mechanism 9 can be covered by the chain cover 46. The tension sprocket 44 can be wound around the axis of the left and right direction, It is rotatably supported by the upper portion of the center portion before and after the chain cover 46a on the left side. The tension sprocket 44 is attached to the left chain cover 46a at a position changeable in the vertical direction. © by adjusting the up and down position of the tension sprocket 44, The degree of stretching of the drive chain 45 can be adjusted. Cover 50, It is detachably attached to the center part before and after the chain cover 46b on the right side from the right outer side. By removing the cover 50, It can be constructed by inspecting the inside of the chain cover 46. Left and right front wheels 5, 5 and rear wheel 6, 6, It is inserted into the left and right end portions of the front axle 3 and the rear axle 4 from the laterally outer side. It can be integrally rotated and fixed to the front axle 3 and the rear axle 4. When the power from the engine Φ 8 is transmitted to the drive shaft 7a via the transmission case 7, When the front axle 3 and the rear axle 4 are rotated via the chain transmission mechanism 9, The front wheel 5 and the rear wheel 6 rotate, The walking lawn mower is configured to move forward or backward. As above, The drive shaft 7a and the swing support shaft 7b extending from the transmission case 7 are The periphery of the axis P1 around the left-right direction is swingably supported by the body frame 2 of the traveling body 1, The power from the engine 8 is transmitted to the drive shaft 7a via the transmission case 7, And by the power from the drive shaft 7a, The front wheel 5 and the rear wheel 6 are rotated by the chain transmission mechanism 9, Thereby, a tilt posture changing mechanism can be constructed. This tilt posture changing mechanism, When the walking machine -15- 200936035 body 1 is advanced, The front side of the cutter 10 is changed to a posture in which the lower side of the cutter 10 is tilted downward. When the walking body 1 is retracted, The rear side of the cutter is changed to a downward swing and then tilted down (refer to Figure 14 and Figure 14). [Detailed structure of the cover] The following is based on Fig. 4 to Fig. 7, Describe the detailed construction of the cover attached to the travel body 1 © cover. Fig. 7 is a longitudinal sectional side view showing the structure of the movable scattering preventing cover 54 as viewed from the inside of the body. As shown in Figures 4 and 5, Main frame 31 on the right and left Before and after the lower side of the central part, Fixed left and right upper side cover 5 1, Here, the upper upper cover 51, A left and right fixed scattering prevention cover 52 is fixed. The left fixed scattering prevents the gap between the lower end of the cover 52 and the ground, It is set to be wider between the lower end of the fixed scattering prevention cover 52 on the right side and the ground. The fixed scattering prevention cover 52 on the left side, By cooperating with the movable fly © to prevent the cover 54, It prevents the mowing from flying to the left. As shown in Figures 5 and 7, The front and rear sprockets 53 extend from below the frame 18. On the sprocket 53 before and after this, A movable flying stop cover 54 is mounted. For the movable scattering prevention cover 54, Forming a long hole 54A before the upper and lower sides, The front rear pin 53A extends from the front and rear sprocket wheels 53 to the left side. It is connected to the long hole 54A before and after this. On the upper part of the movable scattering prevention 54 a spring mounting portion 54a protruding toward the inner side is provided, The spring mounting portion 54a and the front and rear sprocket 53, Equipped with elastic springs 10 13 3 2 left-handed fixed-spaced rear cover -16- 55 200936035 In the lower part of the front end of the movable scattering prevention cover 54, The front inclined portion 54b is formed in a front view so as to be formed in the front upper side. At the lower end of the rear end portion of the movable scattering prevention cover 54, The rear inclined portion 54c is formed in a plan view so as to have a notch formed in the upper rear side. With this, For example, when the walking mower is advanced to bring an obstacle such as a stone from the front left side into contact with the movable scattering preventing cover 54, The long hole 54A formed in the movable scattering prevention cover 54 can be formed by 〇 The movable scattering preventing cover 54 is moved upward against the elastic pressure of the elastic spring 55. The opposite of, When the walker mower is retracted, When an obstacle such as a stone from the left rear side is brought into contact with the movable scattering prevention cover 54, The long hole 54A formed in the movable scattering preventing cover 54 can be formed by The movable scattering prevention cover 54 is moved upward against the elastic pressure of the elastic spring 55. As shown in Figures 4 and 5, The movable scattering prevents the front and the rear of the cover 54, It is arranged along the outer sides of the left front wheel 5 and the rear wheel 6, And formed into a shape in which the front end portion and the rear end portion are bent toward the inner side, respectively, Bend the front and rear ends of the inner side, It is arranged so as to overlap the front wheel 5 and the rear wheel 6 in plan view. In addition, The movable scattering prevents the gap between the lower end of the cover 54 and the ground, It is set to be substantially the same as the gap between the lower end of the fixed flying prevention cover 52 on the right side and the ground. With this, The gap between the lower end of the movable scattering preventing cover 54 and the ground, And the gap between the movable scattering prevention cover 54 and the front wheel 5 and the rear wheel 6 is set to be small, And effectively prevent mowing from scattering to the left. As above, By forming the movable scattering prevention cover 54, In general time, The movable scattering prevention cover 54 can be biased downward by the elastic pressure of the elastic spring 55 to the side of the lower side -17-200936035 to enlarge the front wheel 5 and the rear wheel 6, And covered by the movable scattering prevention cover 54 from the side, When in contact with obstacles, The movable scattering preventing cover 54 is moved upward by the elastic pressure of the elastic spring 55. The movable scattering is prevented from being damaged by the cover 54. In addition, A movable scattering prevention cover 54 may be disposed on the right side of the traveling body 1. Or the movable scattering prevention cover 54 is provided on the left and right sides of the traveling body 1. As shown in Figures 3 and 6, Covering the left and right front wheels 5 between the rubber front spatter preventing members 56, It is attached to the main frame 31 covering the right and left sides so as to be swingable back and forth around the axis in the left-right direction. 32 is set before the frame 33, Covering the rubber rear rear scattering preventing member 57 between the right and left rear wheels 6, The main frame 31 covering the right and left sides can be swinged around the axis around the left and right directions, After 32 is set, the frame 34 is followed. Front and rear scattering prevention members 56, 57, Left and right ends, Formed into the shape of the inner side of the front wheel 5 and the rear wheel 6, respectively. By this, It can effectively prevent mowing from flying forward and backward. 〇 As shown in Figures 4 and 6, The body frame 2 is divided into two upper and lower upper covers 58 before and after, Cover it from above. The central part of the upper and lower upper covers 58 Formed into a shape that expands upwards, The outer peripheral portion is formed into a horizontal shape, The front and rear upper covers 58 are formed into left and right sides of a horizontal shape, The main frame 3 1 is fixed to the right and left. The plural of the upper side of 32. [Detailed structure of the cutter] The following is based on Figure 5 and Figure 8, Explain the detailed structure of the cutter 10 -18- 200936035. Figure 8 is a cross-sectional plan view showing the structure of the cutter. As shown in Figures 5 and 8, The cutter 1 is equipped with a cutter member 11 that is attached to the lower portion of the transmission case 7; a rotating circular plate 12 fixed to the sleeve member 11; a plurality of cutter bodies 13 that can be rotatably supported on the outer circumference of the rotating circular plate 12; And a plurality of diffusion vanes 14 fixed to the upper side of the rotating circular plate 12. Rotating the circular plate 12, By gradually reducing the distance from the ground from the fixed portion of the sleeve member 11 to the outer side, Formed as a lower dish that slopes to the lower side, Further, a horizontal portion 12a which is substantially horizontal to the ground is formed in the outer peripheral portion. The cutter body 1 3 is by: Forming a shape of the upper cutter body 1 3 a which is inclined upwardly to the upper side of the oblique side; And a lower cutter body 1 3b formed into a shape inclined to the lower side toward the outer side, The upper cutter body 1 3 a and the lower cutter body 1 3 b are alternately spaced at an equal interval of approximately 90 degrees, The pin 15 is rotatably supported by a plurality of portions of the horizontal portion 12a of the outer peripheral portion of the rotating circular plate 12. 扩散 diffusion blade 14, By gradually expanding the area of the blade toward the outer side, Formed into a shape that is inclined upward toward the outer side, And at equal intervals of about 90 degrees, The intermediate position of the cutter body 13 adjacent to each other from the axis P2 is radially arranged. In the lower part of the transmission case 7, A cutter cover 16 is mounted, With this knife cover 1, 6 It can prevent mowing from entering the center of rotation. It is constructed by preventing mowing from winding around the center of rotation. [Drive Structure of Walking Lawn Mower] -19- 200936035 The following is based on Figure 9 to Figure 12, The transmission structure of the walking mower is described. Figure 9 shows the transmission system diagram of the walking mower. Fig. 1 and Fig. 11 respectively show a longitudinal sectional view and a cross-sectional plan view of the transmission structure of the walking lawn mower. In addition, Fig. 12 is a perspective view showing the cutter clutch 68. As shown in Figure 9 to Figure 11, Input shaft 62 in the up and down direction, A pair of bearings 61 are rotatably supported on the upper portion of the transmission case 7, The upper end of the input shaft 62, The main clutch 63 is coupled to the output shaft 8c of the engine 8 fixed to the upper portion of the transmission case 7. The transmission gear 64 is integrally rotatable and coupled to the lower portion of the input shaft 62. This drive gear 64, It is engaged with a transmission gear 72 that is coupled to an upper transmission shaft 65, which will be described later. The upper drive shaft 65 and the lower drive shaft 66 are arranged concentrically around the axis P2 of the upper and lower directions of the transmission case 7. The plurality of bearings 67 are rotatably supported by the clips. A cutter clutch 68 is mounted to cover the upper drive shaft 65 and the lower # drive shaft 66. At the lower end of the lower drive shaft 66, The sleeve member 11 to which the cutter 1〇 is fixed is locked from the lower side, When operating the cutter clutch 68 to the entry side, Power from the engine 8, Via the input shaft 62, The upper drive shaft 65 and the cutter clutch 68 are communicated to the lower drive shaft 66. And the cutter 1 is rotated to form. As shown in Figures 10 and 12, The cutter clutch 68 has: Connected to the upper transmission shaft 65 upper clutch 69; And the upper clutch 70 can be integrally rotated and can be externally fitted to the lower clutch 70 of the lower transmission shaft 66 by the sliding groove structure to slide up and down to form the upper clutch 69, and the upper clutch 69, -20-200936035, the lower clutch 70, Forming engagement pieces 69a that are engaged with each other, 70a ο covers the lower side of the lower clutch 7〇 and the upper side of the bearing 67, An elastic spring 68a for biasing the lower clutch 70 upward is provided. By means of the elastic spring 68a, The cutter clutch 68 can be biased to the entry side. On the snap-in piece 69a, 70a, An inclined portion 69b obliquely inclined is formed, 7 0b, In a state where the power from the engine 8 is transmitted to the lower drive shaft 66 via the upper transmission shaft 65, The engaging piece 69a of the upper clutch 69 and the engaging piece 70a of the lower clutch 70 are in mesh with each other. Power from the engine 8 is communicated to the lower drive shaft 66. E.g, In a state where the engine 8 is stopped to stop the rotation of the upper transmission shaft 65, The cutter 1 旋转 rotates due to inertial force, When the inertial force from the cutter 1 is about to be transmitted from the lower drive shaft 66 to the upper drive shaft 65, By means of the engaging piece 69a, The inclined portion 69b of 70a, 70b, Rotating the lower clutch 70 relative to the upper clutch 69, The inertial force from the lower drive shaft ® 66 is prevented from being transmitted to the upper upper drive shaft 65. When the rotation formed by the inertial force of the cutter 10 is stopped, By the elastic thrust of the elastic spring 68a, Operating the lower clutch 70 upwards, The cutter clutch 68 is operated to the entry side. With this, It is possible to prevent the inertial force of the cutter 10 from being rotated in conjunction with the upstream side of the transmission (the engine 8 side and the swing support shaft 7 b side) (for example, the front wheel 5 and the rear wheel 6 are rotated by the inertial force of the cutter 1 )), and, For example, a brake device or the like (not shown) for forcibly braking the rotation of the cutter 10 is attached to the upstream side of the drive of the cutter 10, The condition that the inertial force formed by the rotation of the cutter 1 不会 is not transmitted to the upstream side of the transmission when stopping the engine 8-21-200936035 can be simplified to suppress the inertial force from the cutter 10 to the upstream of the transmission. Side communication mechanism, And reduce manufacturing costs. The lower clutch 70' also functions as a shifting member of the cutter clutch 68, A displacement groove 7〇c is formed in an outer peripheral portion of a lower portion of the lower clutch 70, The operation portion 70a of the shift rocker 71 that is supported around the axis around the front-rear direction so as to be swingable to the left and right, The system is engaged with the shift groove 70c, When the rocker body 71a of the shift rocker 71 is oscillated, The lower clutch 70 is slid up and down, The cutter clutch 68 can be configured to be clutched, as shown in FIG. 9 to FIG. Transmission gear 72, The 73 series is linked to the upper drive shaft 65, The drive gear 72 is engaged with a drive gear 64 that is fixed to the input shaft 62. The transmission gear 75 is coupled to the transmission shaft 74 rotatably supported in the front and rear directions of the transmission case 7, The transmission gear 75 is meshed with a transmission gear 73 that is coupled to the upper transmission shaft 65. 动力 power from the upper drive shaft 65 in the up and down direction, The transmission shaft 74 is changed to an angle of 90 degrees and transmitted to the front-rear direction. The transmission gear 76 is coupled to the transmission shaft 74, The transmission gear 76 is disposed on the lower right side of the transmission shaft 74. And engaging with a transmission gear that is coupled with the transmission shaft 77. The 78° bevel gear 79 is coupled to the transmission shaft 77 in an interlocking manner. The bevel gear 79 is engaged with the bevel gear 80 and the retracting bevel gear 81 before being fitted into the drive shaft 7a in the left-right direction. Drive shaft 7a, The interposing bearing 83 is rotatably supported around the transmission center 7 around the axis P1 in the left-right direction. Forward and -22- 200936035 Back bevel gear 80, 81 is rotatably fitted to the drive shaft 7a. Shifting member 82, Sliding in the left and right direction, Further, it can be rotated integrally with the drive shaft 7a to be fitted between the forward bevel gear 80 and the reverse bevel gear 81. Operating the shaft 84, It can be rotatably supported around the shaft center in the up and down direction to the transmission case 7, The operating arm 85 and the upper and lower operating members 86 are coupled to the upper end portion and the lower end portion of the operating shaft 84. A displacement groove 82a is formed in an outer peripheral portion 移位 of the displacement member 82, An operating member 86 coupled to the operating shaft 84, It is engaged with this shift groove 82a. When the operating arm 85 is swung back and forth, The displacement member 82 slides in the left-right direction and meshes with the forward bevel gear 80 or the reverse bevel gear 81. And configured to advance the traveling body 1, Stop (neutral), Switch back. in this way, With bevel gear 79, Forward with bevel gear 80, Back bevel gear 81, Shift member 82, etc. The forward receding clutch 87 is formed. As shown in Figures 1 and 2, The operating arm 85 is coupled to the steering handle 26 before being mounted on the handle 21, When the operation advances backward and the switching rocker 26 swings toward the forward side (left side), The swinging operation of the operating arm 85 to the rear causes the shifting member 82 to engage with the forward bevel gear 80. The forward receding clutch 87 is operated to enter the forward side, The power from the bevel gear 79, It is transmitted to the drive shaft 7a via the forward bevel gear 80 and the displacement member 82, The drive shaft 7a is driven to rotate in the forward direction. on the other hand, When the operation advances backward and the switching rocker 26 swings toward the retreating side (right side), The operation arm 85 swings forward to cause the shifting member 82 to engage with the reverse bevel gear 81' to cause the forward-reverse clutch 87 to be operated to enter the retreating side. From the umbrella -23- 200936035 gear 79 power, It is transmitted to the drive shaft 7a via the reverse bevel gear 81 and the displacement member 82, The drive shaft 7a is driven to rotate in the reverse direction. As shown in Figure 9 to Figure 11, The drive sprocket 41 of the chain transmission mechanism 9 is coupled to the right end of the drive shaft 7a. The power from the drive shaft 7a, It is transmitted to the front axle 3 and the rear axle 4 via the chain transmission mechanism 9, The front wheel 5 and the rear wheel 6 are reversely rotated in the forward direction to advance or retreat the traveling body 1. 〇 [Detailed structure of mowing height adjustment mechanism] The following is based on Figures 3 and 4, The detailed structure of the mowing height adjustment mechanism 90 (corresponding to the tilt angle adjustment mechanism) will be described. As shown in Figures 3 and 4, Covering the bracket 91 that is locked and fixed to the upper rear side of the left main frame 32, And a plate-shaped bracket 92 that is fixedly fixed to the left side portion of the transmission case 7, Connecting the connecting rod 93, Thereby, the mowing height adjustment mechanism 90 which limits the lower limit range of the mowing height is constructed. 托架 The bracket 91 is formed by bending a plate material into an L shape. In a portion extending upward from a fixed portion of the left main frame 32, The machining process has three adjustment holes 91A, 91B, 91C. The adjustment hole 91A on the upper side is formed into a circular hole. The central adjustment hole 91B and the lower adjustment hole 91C, They are formed into long holes that are long in front and rear. And the mowing height H1 will be described later. H2 H3 is a roughly equal interval, Set the adjustment hole 9 1 B, 9 1 C grows slowly. a front end portion and a rear end portion of the connecting rod 93, They are formed into a shape that is bent toward the inner side and the outer side, respectively. And connecting the front end portion of the connecting rod 93 to the through hole in the left and right direction of the upper portion of the bracket 92 from -24 to 200936035, And engaging the connecting rod 93 portion with the adjusting hole 91A of the bracket 91, 91B, In the case of 91C, 94' is used to limit the upper limit of the swing range around the axis around the left-right direction of the transmission case 7 or the like. When the rear end portion of the engaging rod 93 is engaged with the adjustment hole 91A, the swing of the transmission case 7 around the axis pi in the left-right direction drives the engine 8 to rotate the cutter 1 The high Q of the lower end of the cutter 1 is unchanged at Η 1. When the rear end portion of the engaging rod 93 is engaged with the adjusting hole 91 Β, the rear end portion of the adjusting rod 91 容许 allows the rear end portion of the engaging rod 93, On the other hand, in the long hole range of the adjustment hole 91, the periphery of the shaft center 1 in the direction of the transmission case 7 or the like is allowed to swing forward and backward. For example, when the motive 8 moves the forward-backward switching rocker 26 to the forward side, a cutter 10 at a lower end portion of the transmission case 7, It is approximately Η1 from the ground. It is inclined within the range allowed by the adjustment hole 9 1 Β. The rear end portion of the post 93 is in contact with the front end of the adjustment hole 91Β, Make cut 7: The height of the lower end is automatically changed to height Η2, And maintaining the height when the rear end portion of the connecting rod 93 is engaged with the adjusting hole 91C, the end portion of the adjusting hole 91C allows the rear end of the connecting rod 93, On the other hand, in the long hole range of the adjustment hole 91C, the periphery of the shaft center Ρ1 in the direction of the transmission case 7 or the like is allowed to swing forward and backward. For example, when the motive 8 moves the forward-reverse switching rocker 26 to the forward side, the cutter 1' of the lower end portion of the transmission case 7 is approximately Η1 from the ground. It is inclined within the range allowed by the adjustment hole 9 1 C. The back end of a pin Ρ1, Limit, Even if the degree is still high, After the movement of the system is connected to the horizontal drive, Title, 10 of Η 2. , After the movement of the system is connected to the horizontal drive, -25- 200936035 The rear end of the post 93 contacts the front end of the adjustment hole 91C. The height of the lower end of the cutter 10 is automatically changed to the height H3, And maintain at this height H3. In addition, When the engine 8 is stopped or the forward/reverse switching rocker 26 is operated to the stop side (neutral side), The height of the cutter 10 is automatically changed to a height H1 which is substantially horizontal to the ground. As above, By forming the mowing height adjustment mechanism 90, The rear end portion of the connecting rod 93 is changed to the adjustment hole 91A by the loading and unloading pin 94, 91B, 91C 衔 Connection position, Thereby, the swing range of the transmission case 7 can be changed. And adjust the height change of the lower end of the cutter 10 to HI' H2. The 3 stages of H3, In the three stages, the mowing height of the adjustment cutter 10 (the forward descending inclination angle α (rearward inclination angle) of the cutter 10 to be described later) is changed. [Explanation of the tilting state of the cutter] The following is based on Figures 13 and 14, Indicates the tilt of the cutter 10. Fig. 1 is a diagram showing the tilting state of the cutter 1 〇 in the tilting posture before the traveling body 1 is advanced. Fig. 14 is a view showing the tilting state of the cutter 10 in the tilting posture after the traveling body 1 is retracted. As shown in Figure 13, When the cutter 10 is not rotated and is substantially horizontal to the ground, Switching to the drive engine 8 when the forward-reverse switching rocker 26 is operated to the forward side, The drive shaft 7a rotates around the axis P1 in the left-right direction in the clockwise direction indicated by the black arrow in Fig. 3 . When the drive shaft 7a is rotated clockwise, Due to the reactionary law of force, The direction in which the drive shaft 7a shown by the black arrow shown in Fig. 13 rotates is counterclockwise, It acts on the transmission case 7. When the counterclockwise -26-200936035 force acts on the transmission case 7, Making the transmission case 7, An engine 8 coupled to the transmission case 7 And the cutter 10, Integrally swings around the axis P1 of the left and right direction toward the front, And the mowing range is limited by the mowing height adjustment mechanism 90 (in Fig. 13, When the mowing height is set to H3), the transmission case 7, Engine 8, And when the cutter 10 becomes a horizontal level, it is inclined forward to decrease the angle α. on the other hand, As shown in Figure 14, When the blade is not rotated, it is roughly horizontal with the ground, Switching to the drive engine 8 will move forward and backward. When the switch rocker 26 is operated to the reverse side, The drive shaft 7a is rotated around the axis P 1 in the left-right direction in the clockwise direction indicated by the black arrow in Fig. 14. When the drive shaft 7a is rotated clockwise, Due to the reaction law of force, The counterclockwise force is opposite to the direction in which the drive shaft 7a shown by the black arrow in Fig. 14 rotates. Acting on the transmission case 7° When the counterclockwise force acts on the transmission case 7, Making the transmission case 7, An engine 8 coupled to the transmission case 7 And the cutter 10, Swinging around the axis P1 around the left and right 一体 direction, The swing range is limited by the mowing height adjustment mechanism 90 (in Fig. 14, Set the mowing height to H3), Making the transmission case 7, Engine 8, When the cutter 10 is horizontal, it is inclined further downward to lower the angle α. that is, When the drive engine 8 switches the forward/reverse switching rocker 26 to the forward side or the reverse side, When the walking body 1 is moved forward or backward, The cutter 1 〇 can be automatically swung to the mowing height set automatically by the mowing height adjustment mechanism 90, The cutting operation is performed in advance by the mowing height of the cutter 1 set by the mowing height adjustment mechanism 90. -27- 200936035 As above, Cut the grass by tilting the cutter 1 为 to a forward or backward slant, Having the cutter 10 as the front end or the lower end (the front end or the rear end) closest to the grass (ground), As the direction from the position is opposite to the direction of travel, The gap between the cutter 1 〇 and the grass (ground) passing through the lower side of the cutter 1 逐渐 is gradually increased. As a result, the contact area between the lower side of the cutter 10 and the grass (ground) passing through the lower side of the cutter 10 can be reduced. Reduce the resistance from the 0 cutting grass (ground) acting on the underside of the cutter 1 ,, And reduce the burden on the knife when cutting grass. The result is that Compared with, for example, the cutter 10 is configured to cut the grass in a state of being substantially horizontal to the ground, It can reduce the power that drives the cutter 1 〇 to rotate (the power to cut the weeds). Achieve miniaturization and weight reduction of the engine 8 (for example, while ensuring the ability to cut grass, And set to an engine with a small horsepower), The light weight and light weight of the walking mower are realized. φ [First embodiment of the invention] In the above embodiment, It is shown that the drive shaft 7a and the swing support shaft 7b extending from the transmission case 7 of the traveling body 1 are swingably supported around the axis Ρ1 in the left-right direction, Further, an example of constructing the tilt posture changing mechanism by changing the posture of the cutter 10 into a forward tilt posture and a backward tilt posture is described. However, as long as the cutter 10 can be supported by the traveling body 1 around the left and right axes, Different configurations are also possible. in particular, For example, a configuration in which the cutter 10 is swingably supported around the left and right axes on the lower portion of the transmission case 7 (not shown in -28-200936035) may be employed. Or different from the engine 8 and the transmission case 7, Further, the cutter 10 is supported by the body frame 2 so as to be swingable around the left and right axis (not shown). [Second other aspect of the implementation of the invention] In the above embodiment, Showing the power from the drive shaft 7a, An example of the configuration in which the chain transmission mechanism 9 is transmitted to the front wheel 5 and the rear wheel 6, But also to make the power from the drive shaft 7a, It is transmitted to the front wheel 5 and the rear wheel 6 via different transmission mechanisms. For example, a belt drive mechanism such as a V belt or a timing belt (not shown) may be used. Or use the drive shaft (not shown). In the above embodiment, An example in which the mowing height adjustment mechanism 90 is constructed by engaging the engagement lever 93 with the bracket 91 and the bracket 92 is shown. However, different mechanisms can be used as the mowing height adjustment mechanism 90, For example, it will be used to limit the upper limit of the swinging range of the engine 8 or the transmission case 7 (not shown). Set on the side of the body frame 2, To form a mowing height adjustment mechanism 90. In the above embodiment, An example of forming the mowing height adjustment mechanism 90 in such a manner that the mowing height of the adjustment cutter 10 is changed in three stages is shown. But it can also be in different stages (for example, a phase less than two stages, Or 4 stages, In the stage of the five stages, the mowing height adjustment mechanism 90 is configured by changing the mowing height of the cutting blade. In addition, It is also possible to change the mowing height of the cutting blade 1′ in a non-stage manner, but to change the adjustment in a stepless manner to form the mowing height adjusting mechanism -29- 200936035 90, By this, Fine adjustment of the mowing height of the cutter 10 can be performed, The workability of the cutting operation is further improved. in particular, For example, a limiter (not shown) for limiting the upper limit of the swing range of the engine 8 or the transmission case 7 for swinging, Set on the side of the body frame 2 that does not swing, And by adjusting this restriction, Limiting the upper limit of the swing range of the engine 8 or the transmission case 7 in a stepless manner, The grass cutting height adjustment mechanism 90 is formed. ❹ [Third other aspect of the implementation of the invention] A bar blade (not shown) may also be used. Instead of the cutter 1 of the above embodiment. In the above embodiment, The example shows that the front wheel 5 and the rear wheel 6 are used as the walking device', but a three-wheel walking specification with three wheels (not shown) may be used. Or the track walking device (not shown) replaces the front wheel 5 and the rear wheel 6. 于 In the above embodiment, An example in which the front wheel 5 and the rear wheel 6 are driven by the power from the engine 8 is shown. However, the front wheel 5 or the rear wheel 6 may also be a rotating wheel. And driving the front wheel 5 or the rear wheel 6 with power from the engine 8, And constitute a walking lawn mower. In the above embodiment, the example of the lawn mower using the engine 8 as the motive unit E is shown. However, a different configuration may be employed as the motive power unit E', for example, an electric motor (not shown) driven by electric power such as a battery or a commercial power source may be used. To replace the engine 8. In the above embodiment, An example in which the engine 8 is linked to the upper portion of the movable body 7 to form the prime mover portion E is shown. However, it is also possible to use a motive part E (not shown) which integrally forms the transmission case 7 and the engine 8. In addition, It is also possible to omit the transmission case 7 and simply construct the motive power unit E (not shown) only by the engine 8. at this time, The drive shaft and the swing support shaft in the left and right directions are extended from the engine 8 to the traveling device (wheel, etc.). Lowering the drive shaft downward from the lower portion of the engine 8 toward the cutter 10, The engine 8 is swingably supported around the left and right axes to the body frame 2 (not shown). [Fourth other aspect of the implementation of the invention] In the above embodiment, An example in which the mowing height adjustment mechanism 90 is constructed by engaging the engagement lever 93 with the bracket 91 and the bracket 92 is shown. However, different mechanisms can be used as the mowing height adjustment mechanism 90, For example, a limiter (not shown) for limiting the upper limit of the swing range of the engine 8 or the transmission case 7 to be oscillated, Set on the side of the body frame 2, 〇 To form the mowing height adjustment mechanism 90. In the above embodiment, An example of forming the mowing height adjustment mechanism 90 in such a manner that the mowing height of the adjustment cutter 10 is changed in three stages is shown. But it can also be in different stages (for example, a phase less than two stages, Or 4 stages, In the stage of the five stages, the mowing height adjustment mechanism 90 is formed by changing the mowing height of the cutter 10. It is also possible to change the mowing height of the adjustment cutter 10 in a non-stage manner. Instead, the mowing height adjustment mechanism 90 can be configured in such a manner that the change adjustment is performed in a stepless manner. By this, Mowing for cutter 10 -31 - 200936035 Fine adjustment of height, And further improve the workability of the cutting operation. in particular, For example, a limiter (not shown) for limiting the upper limit of the swing range of the engine 8 or the transmission case 7 for swinging, Set on the side of the body frame 2 that does not swing, And by adjusting this restriction, Limiting the upper limit of the swing range of the engine 8 or the transmission case 7 in a stepless manner, The grass cutting height adjustment mechanism 90 is formed. © [Fourth other aspect of the invention] In the above embodiment, It is shown that when the drive engine 8 switches the forward/reverse switching rocker 26 to the forward side or the reverse side, When the walking body 1 is advanced or retracted, The cutter 10 can be automatically swung to the mowing height set by the mowing height adjusting mechanism 90 to constitute an example of a walking mower. But also the transmission case 7, The engine 8 and the cutter 10 can be integrally supported by the traveling body 1 so as to be swingable integrally in the front-rear direction. And fixing the cutter 10 to the angle set by the mowing height adjusting mechanism 90 (for example, fixing the engaging rod 93 to the plural of the bracket 91), With this, Regardless of whether the walking body 1 is advanced or retracted, In the above embodiment, the walking mower is configured such that the cutting blade 10 is swung to a predetermined mowing height before the inclined posture (or the rearward inclined posture) to form a walking mower. It shows that the walking mowing mechanism can be moved forward and backward. Further, an example of the mowing height adjustment mechanism 90 can be configured by changing the front lowering inclination angle and the backward descending inclination angle of the cutter 10. -32- 200936035 However, it is also possible to make the walking mowing mechanism only forward (or retreat)' or to adjust the mowing height of the cutting blade 10 to the frontal inclination angle (or the rearward inclination angle). Adjustment mechanism 90. Further, the mowing height adjusting mechanism 90 can be configured to make the mowing height at the time of advancing and retreating different. [Simple description of the drawings] Fig. 1 shows the left side view of the entire walker mower. Fig. 2 is a plan view showing the entire lawn mower. Figure 3 is a left side view showing the longitudinal section of the traveling body. Figure 4 is a plan view showing a cross section of the traveling body. Figure 5 is a longitudinal sectional view showing the traveling body. Fig. 6 is a longitudinal sectional side view showing the support structure of the front and rear wheels. 〇 Fig. 7 is a longitudinal sectional side view showing the structure of the movable scattering prevention cover. Fig. 8 is a cross-sectional plan view showing the structure of the cutter. Figure 9 is a diagram showing the transmission system of a walking lawn mower. Figure 10 is a longitudinal cross-sectional rear view showing the transmission structure of the walking mower. Figure 11 is a cross-sectional elevation view showing the transmission structure of the walker mower. Figure 12 is a perspective view showing the cutter clutch. Figure 13 shows the tilt of the cutter during advancement. -33- 200936035 Side view. Fig. 14 is a schematic side elevational view showing the tilting state of the cutter when retracting. [Main component symbol description] 1 : Walking body 5 : Front wheel (walking device) φ 6 : Rear wheel (walking device) 7a: Drive shaft 7b: Swinging shaft 1 〇 : Knife 90 : Mowing height adjustment mechanism (tilt angle adjustment mechanism) E : Momentum P1: Axis (left and right axis) P2 : Axis (upper and lower axis) φ α : Front tilt angle, Rear drop angle -34-