201117997 六、發明說明: 【發明所屬之技術領域】 本發明疋有關於一種兩前輪車輛,特別是指一種具有 兩前輪車輛之防止傾倒裝置。 /、 【先前技術】 現有的機車具有-後輪,及一與該後輪位於同—轴線 上的前輪,藉由這種不穩定的設計雖然換來了操作的靈敏 性,但是相對的也就犧牲了騎乘時的穩定性,使得騎士必 • ㈣依靠自身的平衡感來操控機車以避免機車傾倒,因此 ,年紀稍長或是平衡感較差者都不適合騎乘機車。 相關業者為了增加現有機車的穩定性,近年來積極著 •手研發結合汽車穩定性與機車操控性的混合(hybHd)型車輔 ,例如中華民國公告第469239號所揭露之「具有兩前^ 輪之三輪車輛」,與第93115455號發明專利申請案所揭露的 「具有兩前輪轉向的三輪滾動車輛」,冑利用❺前輪與一後 輪的設計,使騎士在騎乘時能兼具機車的操控性 • 穩定性。 的 為了使兩前輪能同時受控制地相對地面擺動或轉動, 上述車輛皆是利用-四連桿機構以同時控制該二前輪相對 地面擺動或轉動,但是,眾所周知四連桿機構的四個連 接處是相互樞接,因此,在低速或是停車時,該四連桿機 構會產生搖擺進而引起車輛傾倒,因此相關業者研發出如 中華民國第941()2972號發明專财請案所揭露的防搖擺裝 置’利用相互配合設置的鎖定碟盤與鎖定卡*,及一用以 201117997 拉動該鎖定卡鉗的馬達以適時鎖定該四連桿機構,避免車 輛因該四連桿機構的搖擺而傾倒,但是,由於該防搖擺裝 置的鎖定碟盤與鎖定卡鉗須相互對應設置,在安裝上較為 繁瑣,此外還需利用馬達加以驅動該鎖定卡甜 : 影響車輛的空間配置。 卞贫夕 【發明内容】 因此,本發明之目的,即在提供一種具有兩前 之防止傾倒裝置。 於疋’本發明具有兩前輪車輛之防止傾倒裝置,該且 該^輪車輔包括一個具有一中空狀定位件的車架、—與 的應:置的前輪單元’及-用以控制該前輪單元 傾倒裝置包含__個傾斜單元,及 用以鎖定該傾斜單柄敎單元。 该傾斜單元是抱設於該定位件上,其中, 具有兩個分別位於該定位件兩相樞二=早疋 上的懸吊_ H \ Mm又於该傾斜單元 前輪,而該轉向:別樞設於相對應之懸吊機構上的 的操奸,用具有一根柩轉地穿置至於該定位件中 構。'、f —個連動該操縱桿與該二懸吊機構的轉向機 該鎖定單 機構,其中, 位置間移動, 斜單元可以相 鎖定位置時, 凡具有-個整合於該傾斜單元上的液壓鎖定 =液屋鎖疋機構能在—非鎖定位s與—鎖定 虽該液壓鎖定機構位於非鎖定位置時,該傾 對该定位件傾斜,而當該液壓鎖定機構位於 可以鎖定該傾斜單元防止該傾斜單元相對該 201117997 定位件傾斜。 本發明之功效在於 t 、利用此在該非鎖定位置與該鎖定位 置間移動的液㈣定機構,控制該傾斜單元能否相對該定 =件傾斜’進而適時的鎖定該傾斜單元避免因傾斜單元相 =定位件傾斜而造成該具有兩前輪車㈣倒,整體結構 =早,不但能有效簡化安裝程序,也能減少 【實施方式】BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two front wheel vehicle, and more particularly to a dumping prevention device having two front wheel vehicles. /, [Prior Art] The existing locomotive has a rear wheel, and a front wheel on the same axis as the rear wheel. This unstable design is exchanged for operational sensitivity, but the relative Sacrificing the stability of riding, so that the Cavaliers must (4) rely on their own balance to control the locomotive to avoid the locomotive dumping, therefore, younger or less balanced are not suitable for riding a locomotive. In order to increase the stability of existing locomotives, related companies have been actively developing hybrid (hybHd) type vehicles that combine vehicle stability and locomotive handling in recent years. For example, the Republic of China Announcement No. 469239 has "two fronts" The "three-wheeled vehicle", and the "three-wheel rolling vehicle with two front wheel steering" disclosed in the Patent Application No. 93115455, utilizes the design of the front wheel and the rear wheel to enable the knight to control the locomotive while riding. Sexuality • Stability. In order to enable the two front wheels to be oscillated or rotated relative to the ground at the same time, the above-mentioned vehicles use a four-bar linkage mechanism to simultaneously control the two front wheels to swing or rotate relative to the ground. However, it is known that the four joints of the four-bar linkage mechanism are They are pivotally connected to each other. Therefore, at low speed or when parking, the four-bar linkage mechanism will cause a swing and cause the vehicle to fall over. Therefore, the relevant industry has developed an anti-disclosure such as the invention patent of the Republic of China No. 941 () 2972. The rocking device 'uses the locking disc and the locking card* arranged in cooperation with each other, and a motor for pulling the locking caliper with 201117997 to lock the four-bar linkage mechanism in time to prevent the vehicle from falling due to the swing of the four-bar linkage mechanism, but Since the locking disc of the anti-sway device and the locking caliper have to be arranged corresponding to each other, it is cumbersome to install, and the motor is also required to drive the locking card sweetness: affecting the space configuration of the vehicle. SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a dump prevention device having two fronts.于疋' The present invention has a two-wheeled vehicle anti-dumping device, and the wheeled vehicle includes a frame having a hollow positioning member, and a front wheel unit that is disposed and used to control the front wheel The unit dumping device includes __ tilting units and is used to lock the tilting single handle unit. The tilting unit is hung on the positioning component, wherein there are two suspensions _H\Mm respectively located on the two-phase pivotal joint of the positioning component and the front wheel of the tilting unit, and the steering: the pivot The smuggling provided on the corresponding suspension mechanism is placed in the locating member with a twist. ', f - a linkage mechanism of the steering lever and the steering mechanism of the two suspension mechanisms, wherein the position is moved, and when the inclined unit can be locked, the hydraulic lock is integrated with the tilting unit = liquid house locking mechanism can lock in the non-locking position s and - although the hydraulic locking mechanism is in the unlocking position, the tilting is inclined to the positioning member, and when the hydraulic locking mechanism is located, the tilting unit can be locked to prevent the tilting The unit is tilted relative to the 201117997 locator. The effect of the present invention is that t, using the liquid (four) fixed mechanism moving between the unlocked position and the locked position, controlling whether the tilting unit can be tilted relative to the fixed member, and then locking the tilting unit in time to avoid the tilting unit phase = The positioning member is tilted to cause the two front wheel vehicles to fall down. The overall structure = early, not only can simplify the installation procedure, but also reduce the number of embodiments.
、有關本發明之前述及其他技術内容、特點與功效,在 以下配合參考圖式之二個較佳實施例的詳細制中將可 清楚的呈現。 在本發明被詳細描述之前,要注意的是,在以下的說 明内谷中’類似的元件是以相同的編號來表示。 參閱圖1、2,本發能明具有兩前輪車輛之防止傾倒裝 置之第-較佳實施例是安裝於—具有兩前輪車輛2上。 該具有兩前輪車輛2包括一個具有一中空定位件2ιι的 車架21、一與該定位件211對應設置的前輪單元23,及一 用以控制該前輪單元23的轉向單元24。 而該防止傾倒裝置包含一個柩設於該定位件211上的傾 斜單元22,及一用於鎖定該傾斜單元22的鎖定單元25。 /傾斜举元2 2具有二根分別間隔框設於該定位件2 η 上的傾斜連桿221、兩根分別樞設於所述傾斜連桿221兩相 反端的傾斜側管222,及一根枢設於該定位件211上且兩端 是分別與該二傾斜側管222滑動地樞接的連動桿223,其中 ,每一根傾斜連桿221是區分為二個兩端分別樞設於該定 201117997 222的對接桿部224,而該連 對應之傾斜側管222滑動樞 位件211與相對應之傾斜側管222 動桿223 #兩端形成有可供相對應 /引輪單元23具有兩個分別位於該定位件2 11兩相反 上的懸吊機構23 1,及二個分別The foregoing and other technical features, features, and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments. Before the present invention is described in detail, it is to be noted that in the following description, like elements are denoted by the same reference numerals. Referring to Figures 1 and 2, the present invention is directed to a first embodiment of a dumping prevention device having two front wheel vehicles mounted on a vehicle 2 having two front wheels. The vehicle 2 having two front wheels includes a frame 21 having a hollow positioning member 2 ι, a front wheel unit 23 disposed corresponding to the positioning member 211, and a steering unit 24 for controlling the front wheel unit 23. The anti-tip device includes a tilting unit 22 disposed on the positioning member 211, and a locking unit 25 for locking the tilting unit 22. / tilting element 2 2 has two inclined connecting rods 221 respectively arranged on the positioning member 2 η, two inclined side tubes 222 respectively pivoted at opposite ends of the inclined connecting rod 221, and a pivot The locating member 211 is disposed on the locating member 211, and the two ends are slidably coupled to the two slanting side tubes 222, wherein each of the slanting links 221 is divided into two ends respectively. The butt joint portion 224 of the 201117997 222, and the corresponding inclined side tube 222 sliding pivot member 211 and the corresponding inclined side tube 222 the movable rod 223 # are formed at both ends for the corresponding/leading wheel unit 23 to have two separate Suspension mechanism 23 1 on the opposite side of the positioning member 2 11 and two respectively
234是設置於該前又桿233上並朝該定位件2ιι方向延伸, 而每一前輪232是位於相對應之前又桿233下方。 側且樞設於該傾斜單元22上 樞設於相對應之懸吊機構231 吊機構23 1皆具有一拫樞轉地 中的前叉桿233、一個埒罢认 由於所述結合座234是設置於該前又桿233上並朝該 定位件211 #向延伸,而每一前輪232是位於相對應之前叉 桿233下方,因此能有效縮減該具有兩前輪車輛2整體寬 該轉向單元24具有一根樞轉地穿置至於該定位件2ιι 中的操縱桿241 ’及一個連動該操縱桿241與該二懸吊機構 231的轉向機構242,該轉向機構242具有一連設操縱桿 241上且面向所述車輪的轉向座243,及兩根樞設於該轉向 座243上的轉向連桿244,其中,每一根轉向連桿244具有 一桿體245,及兩個分別樞轉地連接該桿體245之兩端以插 201117997 接該轉向座243及相對應之懸吊機構23丨的球接頭246。每 一轉向連桿244的該二球接頭246是分別樞轉地連接該桿 體245之兩端以極接相對應之的轉向座243與結合座234。 因此,當操縱桿241依據箭頭31方向轉動時,帶動該 轉向座243連動每一轉向連桿244驅動所述結合座234,進 而使所述前叉桿233與前輪232依據箭頭32方向轉動。 參閱圖3、4’並一併回顧圖2,該鎖定單元25具有一 個安裝於該傾斜單元22上且能在—非鎖定位置與__鎖定位234 is disposed on the front pole 233 and extends toward the positioning member 2, and each front wheel 232 is located below the rod 233 before being corresponding. Side and pivotally disposed on the tilting unit 22 and pivoted to the corresponding suspension mechanism 231. The lifting mechanism 23 1 has a front fork lever 233 in a pivotal manner, and a pick is recognized because the joint seat 234 is disposed. On the front pole 233 and extending toward the positioning member 211 #, and each front wheel 232 is located below the corresponding front fork 233, thereby effectively reducing the overall width of the vehicle 2 having the two front wheels. The lever pivotally passes through the lever 241 ' in the positioning member 2 ι and a steering mechanism 242 that interlocks the lever 241 and the two suspension mechanisms 231. The steering mechanism 242 has a connecting lever 241 and faces the same a steering base 243 of the wheel, and two steering links 244 pivotally mounted on the steering base 243, wherein each of the steering links 244 has a rod 245, and the two are pivotally connected to the rod The two ends of the 245 are connected to the ball joint 246 of the steering base 243 and the corresponding suspension mechanism 23A by inserting 201117997. The two ball joints 246 of each of the steering links 244 are pivotally coupled to opposite ends of the rod body 245 to abut the corresponding steering base 243 and the coupling seat 234. Therefore, when the joystick 241 is rotated in the direction of the arrow 31, the steering base 243 is caused to drive each of the steering links 244 to drive the coupling seat 234, thereby causing the front fork lever 233 and the front wheel 232 to rotate in the direction of the arrow 32. Referring to Figures 3, 4' and reviewing Figure 2 together, the locking unit 25 has a mounting on the tilting unit 22 and is capable of being in the -unlocked position and the __locking position.
置間移動的液壓鎖定機構25卜及—個用以切換該液屋鎖定 機構25 1的切換開關252。 該液壓鎖定機構251包括一個設置於該傾斜單元22上 的且突伸有一作動桿253,的油壓红⑸、一條連通接該油屋 缸253的循環油路254、一連接該循環油路…且儲存有液 屢油2則儲油器255 ’及一啟閉該循環油路254的控制間 ^,該切換開關252是用以切換該控制閥⑸以控制該循 =路254的啟閉’進而控制該油壓缸253中之液壓油25〇 的流動。The hydraulic locking mechanism 25 that moves between the compartments is provided with a changeover switch 252 for switching the liquid tank locking mechanism 25 1 . The hydraulic locking mechanism 251 includes a hydraulic pressure red (5) disposed on the tilting unit 22 and protruding with an actuating lever 253, a circulating oil passage 254 connected to the oil house cylinder 253, and a circulating oil passage... The oil storage device 255' and the control room for opening and closing the circulating oil circuit 254 are stored, and the switch 252 is used to switch the control valve (5) to control the opening and closing of the circuit 254. The flow of the hydraulic oil 25〇 in the hydraulic cylinder 253 is controlled.
=該《敎機構251位於非較置時,該控制間W Γ箭頭所3所;T該猶環油路254,此時,使用者若依據圖 2所;W L °扳動亀縱桿24卜會將該作動桿253,由圖 圖3丁中立至圖5所示位置,進而使得液壓油250能如 中:頭所示方向於該循環油路中流 該操縱桿Μ的擺動而如… 斜’同時帶動所述前輪單元23相對定位件川 201117997 傾斜;而當該液壓鎖定機構251位於鎖定位置時,該控制 間w是如圖4所禾關閉該循環油路254,揚工 253中之液壓油25〇的流 莖缸 體不可壓縮的特性使該 心253不可再伸縮,進而鎖定該傾斜單元22防止該傾 斜早U相對該定位件211傾斜,使該傾斜單元22位 2所示位置。 、 在此要特別說明的是,由於該油壓紅⑸僅一側突伸 有該作動桿253,,因此,造成圖3'4中之油壓虹⑸兩側 所能容置的液壓油250容積不同’需利用該儲油器255調 整T壓油250的流量,維持該油壓缸253中液壓油25〇進 出量的平衡,以保持該油壓缸253的作用力及作動正確性 ,當然,該液壓鎖定機構251的油壓缸253也可是如圖6 :斤示’兩側皆突伸有作動桿253,,使該油壓缸W兩側所 能容置的液壓 >’由250容積相同’如此,即可無須安裝該儲 油器255調配液壓油250。 於本較佳實%例尹,該油壓缸253是設置於圖2中下 方的傾斜連桿221上,而該作動捍253,的一端是樞設於該 定位件211上,但是,在實際應用上,該油壓缸253也可以 設置於該定位件211上,該作動桿253,的一端則是樞設於 該傾斜單元22的傾斜側管222或連動桿223上,或是如圖 7所示之配置態樣,只要其兩端是分別是樞設於會相對產生 位移的兩點上,即可達成鎖定該傾斜單元22的效果,並不 應為本實施例的揭露所限。 藉由上述設計’當該具有兩前輪車輔2停止時,騎士 201117997 可以利用該切換開關252(例如一電動開關)控制該控制閥 256關閉該循環油路254,擋止該油壓缸253中之液塵油 250的流動,利用流體不可壓縮的特性鎖定該傾斜單元 防止該傾斜單元22相對該定位件211傾斜,有效避免車輛 發生傾倒,而該當具有兩前輪車輛2行進時,則可切換開 關252控制該控制閥256開啟該循環油路254,使得液壓油 250能於該循環油路254中流動,使該具有兩前輪車輛2具= "When the 敎 mechanism 251 is in non-comparison, the control room W Γ arrow 3; T the quaint ring 254, at this time, the user according to Figure 2; WL ° pull the escapement 24 The actuating lever 253 will be neutral from the position shown in FIG. 3 to the position shown in FIG. 5, so that the hydraulic oil 250 can swing the joystick 于 in the circulating oil passage as shown in the head direction. At the same time, the front wheel unit 23 is tilted relative to the positioning member Chuan 201117997; and when the hydraulic locking mechanism 251 is in the locked position, the control room w is closed to the circulating oil passage 254 as shown in FIG. 4, and the hydraulic oil in the lift 253 The incompressible nature of the 25-inch stem cylinder allows the core 253 to be no longer retractable, thereby locking the tilting unit 22 to prevent the tilting U from tilting relative to the positioning member 211, causing the tilting unit 22 to position 2 in position 2. Specifically, it is to be noted that since the hydraulic pressure red (5) protrudes from the actuating rod 253 on only one side, the hydraulic oil 250 that can be accommodated on both sides of the oil pressure rainbow (5) in FIG. 3'4 is generated. The volume is different. The flow rate of the T-pressure oil 250 is adjusted by the oil reservoir 255, and the balance of the hydraulic oil 25 〇 in and out of the hydraulic cylinder 253 is maintained to maintain the force and the correctness of the hydraulic cylinder 253. The hydraulic cylinder 253 of the hydraulic locking mechanism 251 can also be an operating rod 253 protruding from both sides of the hydraulic locking mechanism 251, so that the hydraulic pressure can be accommodated on both sides of the hydraulic cylinder W. The same volume 'this way, the oil reservoir 250 can be dispensed without the need to install the oil reservoir 255. In the preferred embodiment, the hydraulic cylinder 253 is disposed on the inclined link 221 at the lower side in FIG. 2, and one end of the actuating jaw 253 is pivotally mounted on the positioning member 211, but in practice In an application, the hydraulic cylinder 253 can also be disposed on the positioning member 211. One end of the operating rod 253 is pivotally disposed on the inclined side tube 222 or the linkage rod 223 of the tilting unit 22, or as shown in FIG. In the configuration shown, the effect of locking the tilting unit 22 can be achieved as long as the two ends are respectively pivoted at two points which are relatively displaced, and should not be limited by the disclosure of the embodiment. With the above design 'When the two front wheel brakes 2 are stopped, the knight 201117997 can use the changeover switch 252 (for example, an electric switch) to control the control valve 256 to close the circulating oil passage 254 to block the hydraulic cylinder 253. The flow of the liquid dust oil 250 is locked by the incompressible property of the fluid to prevent the tilting unit 22 from tilting relative to the positioning member 211, thereby effectively preventing the vehicle from tipping, and when the two front wheel vehicles 2 are traveling, the switch can be switched. 252 controls the control valve 256 to open the circulating oil passage 254, so that the hydraulic oil 250 can flow in the circulating oil passage 254, so that the vehicle having two front wheels has 2
有較好的過彎操控性能,整體結構簡單,不但能有效簡化 安裝程序,也能減少空間的浪費。 當然,於實際使料,也可採用機械式的切換開關 252(例如一拉桿)來取代上述之電動開關,進而以手動方式 控制該控制閥256的啟閉,同樣可以達成相同的功效 >閱圖8,本發明具有兩前輪車輛之防止傾倒裝置之第 二較佳實施例大致是於該第一較佳實施利相同不相同的 地方在於:該傾斜單元22的所述傾斜連桿221是一體型的 設計,而該㈣鎖定機構251是安裝於該傾斜單元Μ上, 因此可以嗜略不需要安裝如圖2所示的連動桿如,整體構 造較為簡單更有利於生產製造。 綜上所述,本發明具有兩前輪車輛之防止傾倒裝置是 :用能在該非鎖^位置與該較位置間移動的㈣鎖定機 構251,㈣該傾斜單元22能否相對較位件川傾斜, 進而適時的鎖定該傾斜單元22 _ 避免因傾斜早兀22相對該 疋位件211傾斜而造成該具 達成本發明之目的。 輪車輛2傾倒。故彻 201117997 惟以上所述者,僅為本發明之較佳實施例而已,當不 能以此限定本發明實施之範圍,即大凡依本發明申請:利 範圍及發明說明内容所作之簡單的等效變化與修飾,皆仍 屬本發明專利涵蓋之範圍内。 【圖式簡單說明】 圖1是一侧視圖,說明本發明能明具有兩前輪車輛之 防止傾倒裝置的第一较佳實施例; 圖2是另一側視圖,辅助說明圖1 ; •圖3是-示意圖,說明該鎖定單元位於一非鎖定位置 f 圖4是一示意圖,說明該鎖定單元位於-鎖定位置; 圖5是一侧視圖,說明該兩前輪車輛之傾斜翠元傾 時的態樣; ' .圖6是-示意圖,說明該液壓鎖定機構的另_種態樣 施例之鎖定 圖7是一局部侧視圖,說明該第一較佳實 單元的另一種態樣;及 圖 輛之防二 10 201117997 【主要元件符號說明】It has better cornering control performance and simple overall structure, which not only simplifies the installation process, but also reduces the waste of space. Of course, in actual use, a mechanical switch 252 (for example, a pull rod) can be used instead of the above-mentioned electric switch, thereby manually controlling the opening and closing of the control valve 256, and the same effect can be achieved. 8 is a second preferred embodiment of the present invention having a two-wheeled vehicle anti-tip device. The second preferred embodiment of the present invention is substantially identical to the first preferred embodiment in that the tilting link 221 of the tilting unit 22 is a The design of the body type, and the (four) locking mechanism 251 is mounted on the tilting unit ,, so that it is not necessary to install the interlocking rod as shown in FIG. 2, for example, the overall structure is relatively simple and more advantageous for manufacturing. In summary, the anti-dumping device of the two front wheel vehicles of the present invention is: (4) a locking mechanism 251 capable of moving between the non-locking position and the relative position, (4) whether the tilting unit 22 can tilt relative to the positional device, Further locking the tilting unit 22 in a timely manner _ avoids the object of achieving the present invention by tilting the tilting early 22 relative to the clamping member 211. The wheeled vehicle 2 is dumped. The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, that is, the simple equivalent of the scope of the invention and the description of the invention. Variations and modifications are still within the scope of the invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing the first preferred embodiment of the anti-tip device having two front wheel vehicles; FIG. 2 is another side view, which is an explanatory view of FIG. 1; Yes - a schematic diagram showing that the locking unit is in a non-locking position f. Figure 4 is a schematic view showing the locking unit in the -locking position; Figure 5 is a side view showing the aspect of the tilting of the two front wheel vehicles Figure 6 is a schematic view showing the locking of another embodiment of the hydraulic locking mechanism. Figure 7 is a partial side elevational view showing another aspect of the first preferred unit;防二10 201117997 [Main component symbol description]
2 ....... •…具有兩釗輪車輛 241…… •操縱桿 21…… …·車架 242…… •轉向機構 211 •…定位件 243…… •轉向座 22…… •…傾斜單元 244…… •轉向連桿 221 ·· …·傾斜連桿 245…… •桿體 222 •… •…傾斜侧管 246…… •球接頭 223 ·… •…連動桿 25........ •鎖定單元 224… …-對接桿部 250…… •液壓油 225 ·… •…滑動槽 251…… •液壓鎖定機構 23...... —前輪單元 252…… •切換開關 231 …. •…懸爷機構 253…… •油壓缸 232 ··· …·前輪 253, ...·. •作動桿 233 · '…前又桿 254…… •循環油路 234 ··· …結合座 255…… •儲油器 235 ··· …搖臂 256…… •控制閥 236 · …·避震器 31、32 · -箭頭 237 ··· …支撐桿 24…… '…轉向單元2 ....... •... has two wheeled vehicles 241... • Joystick 21... ...·Frame 242... • Steering mechanism 211 •... Positioning member 243... • Steering seat 22... •... Tilting unit 244... • Steering link 221 ···· Tilt link 245... • Rod body 222 •... •... Inclined side tube 246... • Ball joint 223 ·... •... Linkage rod 25..... ... • Locking unit 224... - Docking lever part 250... • Hydraulic oil 225 ·... •... Sliding groove 251... • Hydraulic locking mechanism 23... - Front wheel unit 252... • Diverter switch 231 .... •...The hanging mechanism 253... •Hydraulic cylinder 232 ·····front wheel 253, ...·. • Actuating lever 233 · '...Before the lever 254... •Circulating oil passage 234 ··· ... Joint seat 255... • Oil reservoir 235 ··· ... rocker arm 256... • Control valve 236 · ...·shock absorber 31, 32 · - arrow 237 ··· ... support rod 24... '...steering unit