201021673 六、發明說明： 【發明所屬之技術領域】 本發明係有關一種轉軸結構，尤指一種藉由凸輪以 達到開輕關重之轉轴結構者。 【先前技術】 一般用於掀蓋式電子產品的轉軸，係使蓋體可相 ' 對於本體開啟或蓋合。習知的轉轴結構通常藉由兩個 可相對旋轉的凸輪來達到蓋體與本體閉合時可自動閉 鎖的功能，如本案申請人所擁有的中華民國公告第 ⑮ M296586號的新型專利「具自動閉鎖之轉轴結構」所 示，其係在轉轴上結合一組凸輪構件，其中該凸輪構 件係由一固定件及一滑動件所對接而成，而使其具有 自動閉合的效果。 然而，上述的凸輪結構只具有閉鎖的功能，當離 開閉鎖狀態時，其開啟或閉合蓋體的過程皆為相同的 扭力，由於蓋合時，在某個角度範圍内，例如70度至 0度之間，因蓋體本身重量的因素，會使蓋體加速地自 動落下（free down)，而不慎撞擊到本體造成損壞。此 外，當蓋體掀開至某一角度，例如120度時，亦容易 ® 因蓋體本身重量而往後滑動落下（slip down)撞擊到桌 面。另於蓋體開啟時，為使掀蓋過程更為輕鬆省力， 轉軸需有不同的扭力變化，來使開啟愈來愈輕。因此， 本發明即針對上述的缺失及需求，藉凸輪結構使轉軸 於開啟或閉合蓋體的過程具有不同的扭力變化，以解 決蓋合時蓋體會自動落下以及掀蓋時無法省力容易地 開啟的問題。 【發明内容】 本發明的主要目的，即在提供一種開輕關重的轉 轴結構，以解決蓋體閉合時，因自身重量而自動落下 201021673 撞擊本體的問題，且令蓋體開啟時可較輕鬆省力。該 轉轴於其第二凸輪的周緣形成傾斜的曲面及凹部，曲 面至其中心軸的距離係往凹部的方向逐漸加大，以改 變彈性元件的壓縮量，使轉軸產生不同的扭力變化， 而達到開輕關重的效果。 本發明的另一目的，即在提供一種開輕關重的轉 . 轴結構，其第二凸輪曲面的另一端連接一逐漸突出的 缓衝部，以增加彈性元件的壓縮量，提高扭力，以避 免蓋體開啟至一角度後，因本身重量而向後滑動落下。 本發明的再一目的，即在提供一種開輕關重的轉 ❿ 軸結構，可藉由第一凸輪的凸塊扣合於第二凸輪的凹 部，以達到自動閉鎖的功能。 為達上述目的，本發明開輕關重的轉軸結構所採 取的技術手段係包含： 一心軸，具有限制轴段及凸緣部，並藉一固定座 結合至掀蓋式電子裝置的本體。 一樞接座，係結合於電子裝置的蓋體，其具有一 直立側板，並以一圓形軸孔套設於該限制轴段。 一第一凸輪，以一圓形軸孔套設於該限制軸段， @ 並嵌固於該樞接座，以與樞接座連動，其一侧面設有 至少一凸塊。 一第二凸輪，以一斷面與限制軸段相同的限制孔 套設於該限制轴段，並以一傾斜的接觸面與該第一凸 輪的凸塊相接，該接觸面包含至少一組曲面及連接曲 面的凹部，該曲面至限制孔的中心軸的距離係往凹部 的方向逐漸加大。 一彈性元件，套設於該限制軸段末端，且限制軸 段的末端設有一迫緊元件。 當蓋體開啟時，樞接座轉動並帶動第一凸輪相對 於第二凸輪旋轉，凸塊轉出凹部後進入曲面，由於曲 201021673 面至限制孔的中心軸的距離係逐漸減小，使第二凸輪 侧向移動壓縮彈性元件的壓縮量減小，而逐漸降低扭 力，令開啟愈來愈輕。當反向閉合時，由於曲面至中 心轴的距離逐漸加大，使彈性元件的壓縮量增加，扭 力逐漸提高，而使蓋合愈來愈重。當凸塊進入凹部時， 即形成自動閉鎖的狀態。 ^ 本發明開輕關重的轉軸結構所採取的另一技術手 段係包含： 一心轴，具有限制軸段及凸緣部。 一樞接座，具有一直立側板，並以一軸孔套設於 ❹ 該限制軸段。 一第一凸輪，以一轴孔套設於該限制轴段，並嵌 固於該樞接座，其一侧面設有至少一凸塊。 一第二凸輪，以一斷面與限制軸段相同的限制孔 套設於該限制軸段，並以一傾斜的接觸面與該第一凸 輪的凸塊相接，該接觸面包含至少一組曲面及凹部， 該曲面至限制孔的中心轴的距離係往凹部的方向逐漸 加大，且曲面的另一端係連接一逐漸突出的緩衝部。 一彈性元件，套設於該限制轴段末端，且限制軸 Q 段的末端設有一迫緊元件。 藉由該第二凸輪曲面另一端所連接的緩衝部，而 使蓋體開啟超過一角度時，轉軸的扭力又逐漸增加， 以避免蓋體向後滑動落下。 【實施方式】 請參閱第1〜4圖，係本發明較佳實施例的示意圖。 本發明之轉轴結構係包含一心轴1，該心抽1具有一限 制軸段11及一凸緣部12，該限制軸段11之斷面呈非 圓形，其可具有一平面110，凸緣12的一端連接該限 制軸段11，另一端設有一連接部13，該連接部13可 嵌固於一固定座2,藉該固定座2固定至折疊式電子裝 201021673 置的本體上。 一樞接座3，具有一直立側板31，於直立侧板31 上設有一圓形軸孔32,樞接座3以軸孔32套接於該限 制軸段11，該直立側板31並延伸一設有固定孔34的 結合板33，用以結合至電子裝置的蓋體。該侧板31上 並設有一嵌孔35,以及環設於軸孔32周圍供容置潤滑 油之油孔36。 一第一凸輪4,以一圓形軸孔41套設於該限制軸 段H ’並以一固定柱42嵌固於該樞接座3的嵌孔35， 以與樞接座3連動。其一侧面設有至少一凸塊43，於 本實施例中，凸塊43係設為兩個，並呈相對設置，各 凸塊43的兩侧分別形成斜面43〗，且凸塊43面向轴孔 的一面係向外傾斜形成摩擦面432。 舳e c ^ 一从 ’ U 一斷面與限制軸段11相同的砰 含至少一組曲面521 塊43相接，該接觸面52 ^201021673 VI. Description of the Invention: [Technical Field] The present invention relates to a rotating shaft structure, and more particularly to a rotating shaft structure which is opened by a cam to achieve light weight. [Prior Art] A rotating shaft generally used for a clamshell electronic product allows the cover to be opened or closed to the body. The conventional shaft structure usually achieves the function of automatically locking when the cover body and the body are closed by two relatively rotatable cams, such as the new patent of the Republic of China Announcement No. 15 M296586 owned by the applicant of the present application. The locking shaft structure is shown in the figure, which is coupled with a set of cam members on the rotating shaft, wherein the cam member is abutted by a fixing member and a sliding member, so that it has an automatic closing effect. However, the above-mentioned cam structure only has the function of blocking. When leaving the locked state, the process of opening or closing the cover body is the same torque, due to the cover, in a certain angle range, for example, 70 degrees to 0 degrees. Between the factors of the weight of the cover itself, the cover body is automatically free to fall down, causing damage to the body by accidental impact. In addition, when the cover is opened to an angle, for example, 120 degrees, it is also easy to slip back and hit the table due to the weight of the cover itself. In addition, when the cover is opened, in order to make the cover process easier and less laborious, the rotation shaft needs different torque changes, so that the opening becomes lighter and lighter. Therefore, the present invention is directed to the above-mentioned lack and demand, and the cam structure has different torque changes in the process of opening or closing the cover body to solve the problem that the cover body will automatically fall when the cover is closed and the cover cannot be easily opened when the cover is closed. problem. SUMMARY OF THE INVENTION The main object of the present invention is to provide a hinge structure for opening and closing a light weight to solve the problem that the cover body automatically drops the 201021673 impact body due to its own weight, and the cover body can be opened when the cover body is opened. Easy and effortless. The rotating shaft forms an inclined curved surface and a concave portion on the periphery of the second cam, and the distance from the curved surface to the central axis thereof is gradually increased toward the concave portion to change the compression amount of the elastic member, so that the rotating shaft generates different torque changes, and Achieve the effect of light weight. Another object of the present invention is to provide a rotary shaft structure with a lightly closed weight, and the other end of the second cam curved surface is connected with a gradually protruding buffer portion to increase the compression amount of the elastic member and improve the torque. After the cover is opened to an angle, it will slide back and fall due to its own weight. It is still another object of the present invention to provide a rotary shaft structure for opening and closing the weight, which can be engaged with the recess of the second cam by the projection of the first cam to achieve the function of automatic locking. In order to achieve the above object, the technical means adopted by the light shaft structure of the present invention comprises: a mandrel having a limiting shaft section and a flange portion, and being coupled to the body of the clamshell electronic device by a fixing base. A pivoting seat is coupled to the cover of the electronic device and has an upright side plate and is sleeved on the limiting shaft section by a circular shaft hole. A first cam is sleeved on the limiting shaft segment by a circular shaft hole, and is embedded in the pivoting seat to be coupled with the pivoting seat, and at least one protrusion is disposed on one side thereof. a second cam is sleeved on the limiting shaft segment with a same restriction hole as the limiting shaft segment, and is connected to the convex portion of the first cam by an inclined contact surface, the contact surface comprising at least one set of curved pieces The surface and the concave portion connecting the curved surface, the distance from the curved surface to the central axis of the limiting hole is gradually increased toward the concave portion. An elastic member is sleeved at the end of the limiting shaft segment, and a limiting element is disposed at the end of the limiting shaft portion. When the cover is opened, the pivoting seat rotates and drives the first cam to rotate relative to the second cam, and the bump rotates out of the concave portion to enter the curved surface, and the distance from the central axis of the curved hole 201021673 to the limiting hole is gradually reduced. The compression of the two cam laterally moving compression elastic members is reduced, and the torque is gradually reduced, making the opening lighter and lighter. When the reverse is closed, since the distance from the curved surface to the central axis is gradually increased, the amount of compression of the elastic member is increased, the torque is gradually increased, and the cover is heavier and heavier. When the bump enters the recess, a state of automatic latching is formed. Another technical means adopted by the present invention for a lightly weighted shaft structure includes: a mandrel having a restricted shaft section and a flange portion. A pivoting seat has a standing side panel and is sleeved on the limiting shaft section by a shaft hole. A first cam is sleeved on the limiting shaft segment by a shaft hole and is embedded in the pivoting seat, and one side of the shaft is provided with at least one protrusion. a second cam is sleeved on the limiting shaft segment with a same restriction hole as the limiting shaft segment, and is connected to the convex portion of the first cam by an inclined contact surface, the contact surface comprising at least one set of curved pieces In the face and the recess, the distance from the curved surface to the central axis of the limiting hole is gradually increased toward the concave portion, and the other end of the curved surface is connected to a gradually protruding buffer portion. An elastic member is sleeved at the end of the limiting shaft segment, and a pressing element is disposed at the end of the limiting shaft Q segment. When the cover body is opened more than an angle by the buffer portion connected to the other end of the second cam curved surface, the torque of the rotating shaft is gradually increased to prevent the cover body from sliding backward. [Embodiment] Please refer to Figures 1 to 4, which are schematic views of a preferred embodiment of the present invention. The shaft structure of the present invention comprises a mandrel 1 having a limiting shaft section 11 and a flange portion 12, the limiting shaft section 11 having a non-circular cross section, which may have a plane 110, convex One end of the rim 12 is connected to the limiting shaft segment 11, and the other end is provided with a connecting portion 13 which can be embedded in a fixing base 2, and is fixed to the body of the folding electronic device 201021673 by the fixing base 2. A pivoting seat 3 has a vertical side plate 31, and a circular shaft hole 32 is defined in the vertical side plate 31. The pivoting seat 3 is sleeved on the limiting shaft segment 11 by a shaft hole 32, and the vertical side plate 31 extends A bonding plate 33 having a fixing hole 34 is provided for bonding to the cover of the electronic device. An insertion hole 35 is defined in the side plate 31, and an oil hole 36 is disposed around the shaft hole 32 for receiving lubricating oil. A first cam 4 is sleeved on the limiting shaft segment H' with a circular shaft hole 41 and is fixed to the insertion hole 35 of the pivoting seat 3 by a fixing post 42 for interlocking with the pivoting seat 3. In one embodiment, at least one bump 43 is disposed. In the embodiment, the bumps 43 are disposed in two opposite directions, and the two sides of each of the bumps 43 respectively form a slope 43 and the bumps 43 face the shaft. One side of the hole is inclined outward to form a friction surface 432.舳e c ^ a 砰 一 一 与 与 与 砰 砰 砰 砰 砰 砰 砰 砰 砰 砰 砰 砰 砰 砰 砰 砰 砰 砰 砰 砰 砰 砰
孔的中心軸的距離^522,該曲面521至其限散 如第4圖所示，亦物的方向逐漸加大’ 該第二凸輪5設有二相離大於距離a。於本實施例中， 排列設置，該二組曲而，521與凹部522’並呈環狀 分別相接。第二凸輪與凹部522並與二凸塊4: 漸突出的缓衝部523 面521的另一端連接有一逐 522相連接。該凹部緩衝部523可與另一組凹部 該第二凸輪5 2的兩端並設有斜面及圓角。 件6套設於限制軸段二側設有彈性元件6,彈性 U末端二有1緊元件=二卜=限制· 片61或彈簧，轅等碟μ 弹眭凡件6可為唆數個 限制拍段U，且該等^ 61以圓形軸孔6U套設= 間呈JE反面交錯之方=61具有弧形面，該等彈片’ 201021673 藉由上述構造，請配合參閱第5〜6圖，當第一凸輪 4的凸塊43位於第二凸輪5的凹部522時，第一凸輪 4與第二凸輪5是呈閉鎖狀態。當蓋體開啟時，請同時 參閱第7〜8圖，係以開啟60度為例，樞接座3轉動並 帶動第一凸輪4相對於第二凸輪5旋轉，凸塊43的斜 面431即沿著凹部522的斜面及圓角移動爬坡，而後 凸塊43轉出凹部522進入曲面521，藉由傾斜的接觸 面52，第二凸輪5也同時相對於第一凸輪4侧向往外 移動，並壓縮彈性元件6。當第一凸輪4繼續轉動時， 其摩擦面由斜面431轉換至摩擦面433，由摩擦面433 ❹ 與第二凸輪5的曲面521摩擦轉動，由於曲面521至 限制孔51中心軸的距離於開啟時是逐漸減小，因此， 側向移動的第二凸輪5再逐漸往内移動復位，減少彈 性元件6的壓縮量，而逐漸降低扭力，使得旋轉開啟 時愈來愈輕。而當旋轉開啟至曲面521另一端的缓衝 部523時，藉由逐漸突出的緩衝部523，使開啟轉變成 愈來愈重，可避免蓋體開啟超過一角度後，例如120 度時，即因其自身重量而滑動落下（slip down )。 當蓋體蓋合時，第一凸輪4反向旋轉，由於第二 ^ 凸輪5曲面521至中心轴的距離往凹部522的方向是 逐漸加大，因此，第一凸輪4令第二凸輪5侧向往外 移動壓縮彈性元件6，使扭力逐漸增加，而讓蓋合愈來 愈重，以避免蓋體因其自身重量而自動落下（free down)撞擊到本體。當第一凸輪4的凸塊43再轉動至 第二凸輪5的凹部522時，即令蓋體與本體自動閉鎖。 該樞接座3與第一凸輪4之間可進一步設有一墊 片8,且彈性元件6與迫緊元件7之間亦可設有一墊片 8，墊片8係以一限制孔81套設於心轴1的限制軸段 11，且墊片8上設有數個油孔82。 請參閱第9〜11圖，為本發明之第二實施例。本實 201021673 施例第二凸輪5的接觸面52未設有突出的緩衝部，僅 以一組曲面521及凹部522環狀排列設置，亦可使本 發明具$開輕關重的功能。另於樞接座3的直立侧板 31上凸設有一擋塊37，且側板31與心軸1的凸緣12 =間設有一扇形止擋片9，止擋片9以一限制孔91套 ，於限制轴段11，且限制孔91周圍設有複數油孔92。 當框接座3旋轉至一角度時，其擋塊37可擋止於止擋 片9’=達到限制開啟角度的功能，避免蓋體滑動落下。 請參_閱第12圖’為本發明第二凸輪之另—實施 例’該第„二凸輪5的接觸面52係由三組曲面521與凹 ❹ 部522，狀排列設置而成，而第一凸輪4亦設置與之 配合的三個凸塊43。曲面521的兩端並分別連接至凹 部522，因此，當蓋體開啟時，凸塊43由一凹部a〗 經由曲面521轉至另一凹部522時，藉由該凹 即形成止擋作用，避免蓋體滑動落下。 本發明雖為實現上述目的而揭露了較佳 施例，惟其並非用以限制本發明之構造特徵，访 技術領域之通常知識者應知，在本發明的技=精= 下，任何輕易思及之變化或修飾皆是玎能的，n 本案之申請專利範圍所涵蓋。 白… 【圖式簡單說明】 ❹ 第1圖，係本發明較佳實施例之組合立體圖。 第2圖，係本發明較佳實施例之元件分解圖。 第3圖，係本發明較佳實施例第一凸輪與第二 立體示意圖。 犄之 第4圖，係本發明較佳實施例第二凸輪之平面 第5圖，係本發明較佳實施例之側視圖。 、〜 巧6圖，係本發明第5圖之A-A剖視圖。 第7圖，係本發明旋轉開啟狀態之剖面示意圖。 第8圖，係本發明旋轉開啟時第一凸輪與第二凸輪之 201021673 動作示意圖。 第9圖，係本發明第二實施例之元件分解圖。 第10圖，係本發明第二實施例第二凸輪的接觸面剖視 圖。 第11圖，係本發明第二實施例之止擋結構示意圖。The distance from the central axis of the hole is ^522, and the curved surface 521 is limited to be as shown in Fig. 4, and the direction of the object is gradually increased. The second cam 5 is provided with two phases larger than the distance a. In the present embodiment, the two sets of 521 are arranged in series with the concave portion 522' in a ring shape. The second cam and the recess 522 are connected to the other end of the two projections 521 of the buffer portion 523 which is gradually protruded. The recessed portion 523 can be provided with a bevel and a rounded corner at the opposite ends of the second cam 52 from the other set of recesses. The 6 sets are set on the two sides of the limiting shaft section and are provided with elastic elements 6, and the elastic U end 2 has 1 tight element=2b=limit·piece 61 or spring, 辕, etc. Shooting segment U, and the ^61 is set with a circular shaft hole 6U = the side of the JE reversed side = 61 has a curved surface, the elastic piece '201021673 With the above structure, please refer to the figure 5~6 When the projection 43 of the first cam 4 is located in the recess 522 of the second cam 5, the first cam 4 and the second cam 5 are in a locked state. When the cover is opened, please refer to the figures 7 to 8 at the same time. Taking the opening of 60 degrees as an example, the pivoting seat 3 rotates and drives the first cam 4 to rotate relative to the second cam 5. The inclined surface 431 of the projection 43 is along the edge. The inclined surface of the concave portion 522 and the rounded corner move the hill, and the rear bump 43 rotates out of the concave portion 522 to enter the curved surface 521. By the inclined contact surface 52, the second cam 5 also moves laterally outward relative to the first cam 4, and The elastic element 6 is compressed. When the first cam 4 continues to rotate, the friction surface thereof is switched by the inclined surface 431 to the friction surface 433, and the friction surface 433 摩擦 is frictionally rotated with the curved surface 521 of the second cam 5, since the distance from the curved surface 521 to the central axis of the restriction hole 51 is opened. The time is gradually reduced. Therefore, the laterally moving second cam 5 is gradually moved inwardly and reset, reducing the amount of compression of the elastic member 6, and gradually reducing the torque, so that the rotation becomes lighter and lighter. When the buffer portion 523 is opened to the other end of the curved surface 521, the opening portion is turned into more and more heavy by the gradually protruding buffer portion 523, and the cover body can be prevented from being opened more than an angle, for example, 120 degrees, that is, It slides down due to its own weight. When the cover body is closed, the first cam 4 rotates in the reverse direction, and since the distance from the curved surface 521 of the second cam 5 to the central axis is gradually increased toward the concave portion 522, the first cam 4 makes the second cam 5 side The compression elastic member 6 is moved outward to gradually increase the torsion force, and the cover is made heavier and heavier to prevent the cover body from being freely hitting the body due to its own weight. When the projection 43 of the first cam 4 is rotated again to the recess 522 of the second cam 5, the cover and the body are automatically locked. A spacer 8 may be further disposed between the pivoting seat 3 and the first cam 4, and a spacer 8 may be disposed between the elastic member 6 and the pressing member 7. The spacer 8 is sleeved by a limiting hole 81. The shaft shaft 11 is limited to the shaft section 11, and the gasket 8 is provided with a plurality of oil holes 82. Please refer to Figures 9 to 11 for a second embodiment of the present invention. The contact surface 52 of the second cam 5 of the embodiment is not provided with a protruding buffer portion, and only one set of the curved surface 521 and the concave portion 522 are arranged in a ring shape, and the present invention can also have the function of opening and closing the light. A stopper 37 is protruded from the upright side plate 31 of the pivoting seat 3, and a side stop plate 9 is disposed between the side plate 31 and the flange 12 of the mandrel 1. The stop piece 9 is sleeved by a limiting hole 91. The shaft section 11 is restricted, and a plurality of oil holes 92 are provided around the restriction hole 91. When the frame holder 3 is rotated to an angle, the stopper 37 can be blocked from the stopper piece 9' = the function of limiting the opening angle to prevent the cover from sliding down. Referring to Figure 12, the second embodiment of the second cam of the present invention, the contact surface 52 of the second cam 5 is formed by three sets of curved surfaces 521 and concave portions 522. A cam 4 is also provided with three protrusions 43. The two ends of the curved surface 521 are respectively connected to the concave portion 522. Therefore, when the cover body is opened, the convex block 43 is transferred from the concave portion a through the curved surface 521 to another In the case of the recess 522, the recess is formed to prevent the cover from sliding down. The present invention has been disclosed in order to achieve the above object, but it is not intended to limit the structural features of the present invention. It should be understood by those skilled in the art that under the skill of the present invention, any change or modification that is easily thought of is incapable, n is covered by the scope of the patent application. White... [Simple description of the schema] ❹ 1st BRIEF DESCRIPTION OF THE DRAWINGS Fig. 2 is an exploded perspective view of a preferred embodiment of the present invention. Fig. 3 is a first perspective view showing a first cam and a second perspective view of a preferred embodiment of the present invention. Figure 4 is a second convex embodiment of the preferred embodiment of the present invention Figure 5 is a side view of a preferred embodiment of the present invention. Fig. 7 is a cross-sectional view taken along line AA of Fig. 5 of the present invention. Fig. 7 is a schematic cross-sectional view showing the state of rotation of the present invention. Figure 10 is a schematic view showing the operation of the first cam and the second cam 201021673 when the invention is rotated. Fig. 9 is an exploded view of the second embodiment of the present invention. Fig. 10 is a second cam of the second embodiment of the present invention. Fig. 11 is a schematic view showing a stop structure of a second embodiment of the present invention.
第12圖，係本發明第二凸輪之另一實施例。 【主要元件符號說明】 1、心轴 11、限制軸段 110、平面 12、凸緣 13、連接部 2、固定座 3、樞接座 31、側板 32、軸孔 33、結合板 34、固定孔 35、後孔 36、油孔 37、擋塊 4、第一凸輪 41、轴孔 42、固定柱 43、凸塊 431、斜面 432、摩擦面 5、第二凸輪 51、限制孔 52、接觸面 521、曲面 522、凹部 523、緩衝部 6、彈性元件 61、彈片 611、轴孔 7、迫緊元件 8、墊片 81、限制孔 82、油孔 9、止擋片 91、限制孔 92、油孔Figure 12 is another embodiment of the second cam of the present invention. [Description of main components] 1. Mandrel 11, restricting shaft section 110, plane 12, flange 13, connecting portion 2, fixing base 3, pivoting seat 31, side plate 32, shaft hole 33, coupling plate 34, fixing hole 35. Rear hole 36, oil hole 37, stopper 4, first cam 41, shaft hole 42, fixing post 43, bump 431, inclined surface 432, friction surface 5, second cam 51, restriction hole 52, contact surface 521 , curved surface 522, concave portion 523, buffer portion 6, elastic member 61, elastic piece 611, shaft hole 7, pressing member 8, spacer 81, restricting hole 82, oil hole 9, stopper piece 91, restricting hole 92, oil hole