201217597 六、發明說明： 【發明所屬技術領域j 發明領域 本發明係有關一種驅動滾筒式洗衣機之旋轉滾筒的馬 達之驅動滑輪與皮帶的構成。 【先前技術3 發明背景 習知’例如在特開2009-78056號公報(以下記為「專利文 獻1」）中，揭示有將固著於水槽之外底部之馬達的旋轉，從 升>成於馬達軸之驅動滑輪或是固著於馬達軸之驅動滑輪透 過皮帶，而傳達至直接連結於旋轉滾筒之從動滑輪，來作 為驅動滾筒式洗衣機之旋轉滾筒的構成。 以下，就有關記載於專利文獻1之習知滾筒式洗衣機的 構成，利用第4圖來進行說明。第4圖係習知滚筒式洗衣機 之縱斷面圖。 如第4圖所示，習知之滾筒式洗衣機在洗衣機本體训 部具有水槽32，在水槽32内部，旋轉浪筒33係正轉、逆轉 複數脫水運轉時之排 等可自由旋轉地軸支撐於旋轉軸35 水用的小孔設於旋轉滚筒33之外周壁，而在内周壁設有 複數個衣職拌㈣板36。設於_”33之衣服授样用 隔板36在洗滌行程中，藉由低速的 正旋轉、逆旋轉（例如201217597 VI. Description of the Invention: 1. Field of the Invention The present invention relates to a drive pulley and a belt of a motor that drives a rotary drum of a drum type washing machine. In the prior art, Japanese Patent Laid-Open Publication No. 2009-78056 (hereinafter referred to as "Patent Document 1") discloses that the rotation of the motor fixed to the bottom of the water tank is increased from liter to The drive pulley of the motor shaft or the drive pulley fixed to the motor shaft is transmitted through the belt to the driven pulley directly coupled to the rotary drum to constitute a rotary drum for driving the drum type washing machine. Hereinafter, the configuration of a conventional drum type washing machine described in Patent Document 1 will be described with reference to Fig. 4. Figure 4 is a longitudinal sectional view of a conventional drum type washing machine. As shown in Fig. 4, the conventional drum type washing machine has a water tank 32 in the main body of the washing machine, and in the inside of the water tank 32, the rotating rocker 33 is rotated in the forward direction and reversed in the plural dehydrating operation, and the shaft is rotatably supported on the rotating shaft. 35 The water hole is provided on the outer peripheral wall of the rotary drum 33, and the inner peripheral wall is provided with a plurality of clothes mixed (four) plates 36. The garment-providing spacer 36 provided at _"33 is rotated at a low speed by a low-speed positive or negative rotation during the washing stroke (for example,
又，在第4圖所示之旋轉滾筒33的右 端邹固著有旋轉轴 201217597 35，在旋轉軸35之右端部固著有從動滑輪37。水槽32之外 底部設有馬達20，且在馬達20之馬達軸39端部形成有複數 條V溝43(在第5圖後述）。且’馬達2〇之馬達軸39與從動滑 輪37之間伸張設有具複數條V狀溝42(在第5圖後述）的皮帶 38。 又，洗衣機本體31上方設有組入了自開關（未圖示）等接 收輸入訊號之微電腦（未圖示）等之控制部34。控制部34控制 自洗滌行程到脫水行程等之一連串的行程，且進行馬達2〇 之在洗滌行程的低速旋轉及在脫水行程之高速旋轉等切換 控制。 以下，就有關習知滾筒式洗衣機之馬達的馬達軸與皮 帶之構成，使用第5圖進行說明。第5圖係說明習知滾筒式 洗衣機之馬達的馬達軸附近（第4圖之b部）之構成的重要部 分放大圖。 如第5圖所示，以具有強度及剛性之鋼材所形成之馬達 軸39之前端部附近的外周，形成有對應皮帶38之¥狀溝42 而嵌合之複數條V溝43。此時，以馬達軸39之複數條、溝43 的外徑D2與馬達軸39之直徑〇1大致相同（包含相同），而形 成有V溝43。因此，不須以其他構件構成驅動滑輪等並安裝 於馬達軸39，而可以小直徑之馬達軸％實現驅動側之滑 輪。其結果，即使從動滑輪37之外徑較小，也可使馬達軸 39與從動滑輪37之減速比（從動滑輪37之直徑/馬達軸邛之 直徑)較大。 如以上所說明的，習知之滾筒式洗衣機藉由馬達2〇旋 4 201217597 轉數之切換控制，以一個減速比透過皮帶38而將馬達2〇之 方疋轉傳達至旋轉滾筒33。藉此’於洗務行程、脫水行程中， 可進行旋轉滚筒33之旋轉驅動。 但是，於習知之構成中，為了更加大減速比，必須使 成為馬達側之驅動滑輪之馬達軸39的外徑更小。其結果， 皮帶38與馬達軸39之V溝43之周速度變得更高速。 一般來說，皮帶38係使具耐熱性、耐磨耗性等之合成 橡膠構成為主體，並具有大的摩擦力。因此，皮帶38之、 狀溝42與設於馬達軸39之前端部附近之外周的、溝43以高 • 速之周速度反覆密接、脫離。其結果，發生因高速之密接、 .脫離所產生之滑動聲，而於洗滌運轉中有所謂作為異聲對 • 使用者給予不快感的課題。 又，將低溫之洗滌水供給至水槽32時，包含於洗衣機 本體31内部之空氣的水分（水蒸氣）凝結（結露）於水槽32等 之外壁，有滴下於皮帶38之V狀溝42與馬達軸39之V溝43的 滑動部而附著的情況。此時，皮帶38之、狀溝42與馬達軸39 之V溝43的周速度低時’ 一些水分即使附著於滑動部也不會 對朝旋轉滾筒33之旋轉傳達力造成大影響。但是，如習知 例般，驅動側之滑輪為馬達軸時，由於馬達軸的直徑小周 速度變快，所以皮帶38的V狀溝42與馬達軸39的V溝43之間 發生滑動(slip)。因此’變得無法將馬達2〇之旋轉正確地朝 方疋轉滾筒33傳達。其結果，而有所謂在洗滌行程及脫水行 程之性能降低的問題。 t發明内容】 5 201217597 發明概要 本發明之滾筒式洗衣機包含有支持於洗衣機本體内之 水槽、支持於水槽内之旋轉滚筒、固著於水槽之外底部之 馬達、設於馬達之馬達軸端之驅動滑輪、將一端固著於旋 轉滚筒之旋轉軸、固設於旋轉軸之另一端之從動滑輪、及 將馬達之旋轉傳達至從動滑輪之皮帶，且具有將被覆驅動 滑輪之外周的防水罩固著於馬達之構成。 藉此，防止由驅動滑輪與皮帶之滑動摩擦而發生之異 聲的擴散。又，可防止凝結於水槽等外壁之水分朝驅動滑 輪與皮帶之滑動部附著所產生之r滑動」的發生。其結果， 可防止洗滌行程及脫水行程中旋轉滚筒之旋轉數等之變動 所產生之洗務性能的降低。 圖式簡單說明 第1圖係本發明實施形態之滾筒式洗衣機之縱斷面圖。 第2圖係說明前述滾筒式洗衣機之馬達之馬達軸附近 (第1圖之A部）構成之重要部分放大圖。 第3圖係前述滾筒式洗衣機之從第2圖所示之B方向的 3-3線斷面圖。 第4圖係習知滾筒式洗衣機之縱斷面圖。 第5圖係說明習知滾筒式洗衣機之馬達之馬達軸附近 (第4圖之B部）構成之重要部分放大圖。 I：實施方式3 較佳實施例之詳細說明 以下，就有關本發明之實施形態，一面參照圖示一面 6 201217597 崎說明。且，與習知例相同之構成者賦予_符號而省 略說明。又，並非以以下之實施形態而限定本發明者。 (實施形態） 第1圖係本發明實施形態之滾筒式洗衣機之縱斷面圖。 如第1圖所示’本實施形態之滾筒式洗衣機係於洗衣機 本體31内部具有水槽32 ’且在水槽32内部旋轉滾筒33係正 轉、逆轉等可自由旋轉地轴支撐於旋轉軸35。於旋轉滚筒 33之外周壁設有複數脫水運轉時之排水用的小孔41，且在 内周壁設有複數個衣服擾掉用隔板3 6。設於旋轉滚筒3 3之 . 衣服攪拌用隔板36在洗滌行程中係藉由低速之正旋轉、逆 旋轉(例如50rpm)進行衣服攪拌，且在脫水行程中利用高速 之單方向旋轉(例如lOOOrpm)而從衣服離心分離水分。 ' 又，旋轉滚筒33透過設於水槽32外底部之馬達20，藉 由以下所示之機構而旋轉驅動。此時，在馬達20之馬達轴 (在第1圖未圖示）的前端部裝設有防水罩1。 以下，就有關本實施形態滚筒式洗衣機之馬達之馬達 軸附近的構成及機構，使用第2圖與第3圖進行說明。 第2圖係說明前述滾筒式洗衣機之馬達之馬達軸附近 (第1圖之A部)構成的重要部分放大圖。第3圖係前述滚筒式 洗衣機之從第2圖所示之B方向的3-3線斷面圖。 如第2圖所示，本實施形態之滾筒式洗衣機係於馬達2〇 之馬達軸39之前端部，固著有具伸張設有皮帶38之複數V 溝43的驅動滑輪2。且，固著於馬達軸39之驅動滑輪2外周 設有被覆驅動滑輪2周圍的防水罩1。防水罩1係例如以塑膠 7 201217597 成型構件形成，並以將開口部3設於皮帶38通過之位置的例 如斷面形狀為略：？字狀（包含：3字狀）的圓筒形狀而形成。 又，防水罩1在馬達20側具有複數個例如L字形之爪片 4。且’藉由將爪片4卡固於馬達20之前板5的小孔8，而定 位防水罩1與馬達。再者，複數個安裝座6與圓筒部U—體 形成於防水罩1之圓筒部1 a外周的馬連20側，且例如藉由小 螺絲7等而螺固於馬達20之前板5。 又’例如不織布等所產生之毛氈、發泡體及多孔質體 等之吸音材9 ’藉由嵌入或是接著而裝設於防水罩丨之圓筒 部la的内周部。 又’於防水罩1之u字狀右側（在第2圖所示之右側面側） 設有連接於皮帶38通過之開口部3的側面開口 1〇。透過設於 防水罩1之側面開口 10 ’而可觀察皮帶38朝固著於馬達軸39 之驅動滑輪2的安裝、皮帶38之V狀溝42與驅動滑輪2之V溝 43之滑動狀態的觀察、及皮帶38之張力等之變化所產生之 鬆弛等。 又’如第3圖所示’在防水罩i之上方設有2處皮帶观 過之開口部3。目此’吸音材9係裝設於防水罩i之除了 2處 開口部3之圓筒部la的全内周面。 又，在防水罩1之皮帶38通過之開口部3的上方側面， 肋體U —體設於與馬達_之延伸方向相同的方向。藉 此，可防止凝結(結露)於水槽等之水分滴下到防水罩i之丄 面I2’並從開口 W朝防水罩丨内部之皮帶％的雅溝42與驅 動滑輪2之V溝43的滑動部分侵入。 、 201217597 如以上之S兒明，依據本實施形態之滾筒式洗衣機，町 藉由防水罩1將因馬達20之旋轉而在皮帶38與驅動滑輪2之 /月動4所發生之滑動聲等異聲遮聲(遮蔽）。藉此，可顯著地 降低傳播到洗衣機本體31之外部的滑動聲等異聲。其結 果，可抑制因洗衣機之運轉中的異聲而給予使用者的不快 感。 又，依據本實施形態之滾筒式洗衣機，藉由在防水罩1 之内周部裝設吸音材9，而可吸收滑動聲等異聲或防止在防 水罩1内部之回音的發生。其結果，顯著地降低洗衣機本體 31之朝外部異聲的傳播。 又’依據本實施形態之滾筒式洗衣機，藉由除了皮帶 38通過之開口部3在防水罩1之大致内周部之全周圍裝設吸 音材9 ’而可有效地吸收滑動聲等異聲，且可顯著地抑制回 音等的發生。 又，依據本實施形態之滚筒式洗衣機，皮帶38之V狀溝 42與驅動滑輪2之V溝43的滑動部之周圍，除了開口部3，以 防水罩1被覆。因此’可有效地降低凝結（結露)於外槽32等 之外壁而滴下的水分朝滑動部的侵入。藉此，可防止發生 皮帶38之V狀溝42與驅動滑輪2之V溝43的滑動。其結果， 可防止洗滌行程及脫水行程中旋轉滚筒33之旋轉數等之變 動所產生之洗滌性能的降低。 本發明包含支持於洗衣機本體内的水槽、支持於水槽 内之旋轉滚筒、固著於水槽之外底部的馬達、設於馬達之 馬達轴端之驅動滑輪、一端固著於旋轉滚筒之旋轉轴、固 201217597 設於旋轉軸之另一端的從動滑輪、將馬達的旋轉傳達至從 動滑輪之皮帶，並具有將被覆驅動滑輪之外周的防水罩固 著於馬達的構成。藉此，可防止驅動滑輪與皮帶之滑動摩 擦所產生之異聲朝外部擴散，且可防止發生水分朝驅動滑 輪與皮帶之滑動部附著所產生之「滑動」。 又，本發明具有將吸音材裝設於防水罩之内周部的構 成。藉此，可有效地將驅動滑輪與皮帶之滑動摩擦所發生 之異聲吸音，並可顯著地降低噪音朝外部的擴散。 又，本發明具有吸音材裝設於除了皮帶通過之開口部 的驅動滑輪之周圍的構成。藉此，可有效地吸收驅動滑輪 與皮帶之滑動摩擦所發生之異聲。 又，本發明中吸音材係毛氈。藉此，對驅動滑輪與皮 帶之滑動摩擦所產生之異聲獲得高吸收效果。 L圖式簡單說明3 第1圖係本發明實施形態之滚筒式洗衣機之縱斷面圖。 第2圖係說明前述滚筒式洗衣機之馬達之馬達軸附近 (第1圖之A部）構成之重要部分放大圖。 第3圖係前述滾筒式洗衣機之從第2圖所示之B方向的 3-3線斷面圖。 第4圖係習知滾筒式洗衣機之縱斷面圖。 第5圖係說明習知滾筒式洗衣機之馬達之馬達軸附近 (第4圖之B部）構成之重要部分放大圖。 【主要元件符號說明】 1...防水罩 la...圓筒部Further, at the right end of the rotary drum 33 shown in Fig. 4, a rotating shaft 201217597 35 is fixed, and a driven pulley 37 is fixed to the right end portion of the rotary shaft 35. A motor 20 is provided at the bottom of the water tank 32, and a plurality of V grooves 43 (described later in Fig. 5) are formed at the end of the motor shaft 39 of the motor 20. Further, a belt 38 having a plurality of V-shaped grooves 42 (described later in Fig. 5) is stretched between the motor shaft 39 of the motor 2 and the driven pulley 37. Further, a control unit 34 such as a microcomputer (not shown) that receives an input signal such as a switch (not shown) is provided above the main body 31 of the washing machine. The control unit 34 controls a series of strokes from the washing stroke to the dehydration stroke, and performs switching control such as low-speed rotation of the washing stroke of the motor 2 and high-speed rotation of the dehydrating stroke. Hereinafter, the configuration of the motor shaft and the belt of the motor of the conventional drum type washing machine will be described with reference to Fig. 5. Fig. 5 is an enlarged view of an essential part showing the configuration of the vicinity of the motor shaft of the motor of the conventional drum type washing machine (part b in Fig. 4). As shown in Fig. 5, a plurality of V grooves 43 fitted to the outer peripheral portion of the front end portion of the motor shaft 39 formed of a steel material having strength and rigidity are formed with the groove 64 of the belt 38. At this time, the V groove 43 is formed by a plurality of the motor shafts 39 and the outer diameter D2 of the groove 43 being substantially the same as the diameter 〇1 of the motor shaft 39 (including the same). Therefore, it is not necessary to constitute a drive pulley or the like with other members and to be attached to the motor shaft 39, and the drive side pulley can be realized with a motor shaft % of a small diameter. As a result, even if the outer diameter of the driven pulley 37 is small, the reduction ratio of the motor shaft 39 and the driven pulley 37 (the diameter of the driven pulley 37 / the diameter of the motor shaft )) can be made large. As described above, the conventional drum type washing machine transmits the rotation of the motor 2 to the rotary drum 33 through the belt 38 at a reduction ratio by the switching control of the motor 2 whirl 4 201217597 number of revolutions. Thereby, the rotational driving of the rotary drum 33 can be performed in the washing stroke and the dehydration stroke. However, in the conventional configuration, in order to increase the reduction ratio, it is necessary to make the outer diameter of the motor shaft 39 which is the drive pulley on the motor side smaller. As a result, the peripheral speed of the belt 38 and the V groove 43 of the motor shaft 39 becomes higher. In general, the belt 38 is formed of a synthetic rubber having heat resistance, abrasion resistance, and the like as a main body, and has a large frictional force. Therefore, the groove 42 of the belt 38 and the groove 43 provided on the outer periphery of the vicinity of the front end portion of the motor shaft 39 are repeatedly brought into close contact with each other at a high speed. As a result, there is a problem that the sliding sound generated by the high-speed close contact and the detachment occurs, and in the washing operation, there is a problem that the user is unpleasant as a different sound. When the low-temperature washing water is supplied to the water tank 32, the moisture (water vapor) of the air contained in the inside of the washing machine body 31 is condensed (condensed) on the outer wall of the water tank 32, and the V-shaped groove 42 and the motor dropped on the belt 38. The sliding portion of the V groove 43 of the shaft 39 is attached. At this time, when the circumferential speed of the groove 42 of the belt 38 and the V groove 43 of the motor shaft 39 is low, some moisture does not greatly affect the rotational transmission force to the rotary drum 33 even if it adheres to the sliding portion. However, as in the case of the conventional example, when the pulley on the drive side is a motor shaft, since the diameter of the motor shaft is small, the speed is fast, so that the V-shaped groove 42 of the belt 38 and the V groove 43 of the motor shaft 39 slide (slip). ). Therefore, it becomes impossible to accurately convey the rotation of the motor 2 to the side turn roller 33. As a result, there is a problem that the performance in the washing course and the dehydration process is lowered. SUMMARY OF THE INVENTION 5 201217597 SUMMARY OF THE INVENTION The drum type washing machine of the present invention comprises a water tank supported in the washing machine body, a rotating drum supported in the water tank, a motor fixed to the bottom of the water tank, and a motor shaft end provided on the motor. a driving pulley, a rotating shaft fixed to one end of the rotating drum, a driven pulley fixed to the other end of the rotating shaft, and a belt for transmitting the rotation of the motor to the driven pulley, and having a waterproof cover covering the outer circumference of the driving pulley At the composition of the motor. Thereby, the diffusion of the noise generated by the sliding friction between the drive pulley and the belt is prevented. Further, it is possible to prevent the occurrence of r slippage caused by moisture adhering to the outer wall of the water tank or the like to the sliding portion of the drive pulley and the belt. As a result, it is possible to prevent a decrease in the washing performance due to fluctuations in the number of rotations of the rotary drum during the washing stroke and the dehydrating stroke. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a longitudinal sectional view showing a drum type washing machine in accordance with an embodiment of the present invention. Fig. 2 is an enlarged view of an essential part of the vicinity of the motor shaft of the drum type washing machine (part A of Fig. 1). Fig. 3 is a sectional view taken along line 3-3 of the drum type washing machine in the B direction shown in Fig. 2; Figure 4 is a longitudinal sectional view of a conventional drum type washing machine. Fig. 5 is an enlarged view of an essential part of the vicinity of the motor shaft of the motor of the conventional drum type washing machine (part B of Fig. 4). I. EMBODIMENT 3 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings 6 201217597. Further, the same constituents as those of the conventional example are given the _ symbol and are omitted from description. Further, the inventors are not limited by the following embodiments. (Embodiment) FIG. 1 is a longitudinal sectional view of a drum type washing machine in accordance with an embodiment of the present invention. As shown in Fig. 1, the drum type washing machine of the present embodiment has a water tank 32' inside the washing machine main body 31, and the rotary drum 33 is rotatably supported by the rotating shaft 35 in the inside of the water tank 32. The outer peripheral wall of the rotary drum 33 is provided with a small hole 41 for drainage during a plurality of dehydration operations, and a plurality of clothes disturbing partitions 36 are provided on the inner peripheral wall. The clothes mixing baffle 36 is provided for the clothes agitating by the low speed positive rotation, the reverse rotation (for example, 50 rpm) during the washing stroke, and the high speed unidirectional rotation (for example, 1000 rpm in the dehydration stroke). ) and separate the moisture from the clothes. Further, the rotary drum 33 passes through the motor 20 provided at the outer bottom of the water tank 32, and is rotationally driven by the mechanism shown below. At this time, the waterproof cover 1 is attached to the front end portion of the motor shaft (not shown in Fig. 1) of the motor 20. Hereinafter, the configuration and mechanism of the vicinity of the motor shaft of the motor of the drum type washing machine of the present embodiment will be described with reference to Figs. 2 and 3 . Fig. 2 is an enlarged view of an important part of the vicinity of a motor shaft (portion A in Fig. 1) of the motor of the drum type washing machine. Fig. 3 is a sectional view taken along line 3-3 of the drum type washing machine in the B direction shown in Fig. 2; As shown in Fig. 2, the drum type washing machine of the present embodiment is attached to the front end portion of the motor shaft 39 of the motor 2A, and the drive pulley 2 having the plurality of V grooves 43 provided with the belt 38 is fixed. Further, a waterproof cover 1 covering the periphery of the drive pulley 2 is provided on the outer circumference of the drive pulley 2 fixed to the motor shaft 39. The waterproof cover 1 is formed, for example, by a plastic member 7 201217597 molded member, and the cross-sectional shape of the opening portion 3 at a position where the belt 38 passes is abbreviated as: It is formed in the shape of a cylinder (including: a three-shape). Further, the waterproof cover 1 has a plurality of claw pieces 4, for example, L-shaped on the motor 20 side. And the waterproof cover 1 and the motor are positioned by engaging the claw piece 4 with the small hole 8 of the plate 5 before the motor 20. Further, a plurality of mounts 6 and a cylindrical portion U are formed on the side of the marim 20 on the outer circumference of the cylindrical portion 1a of the waterproof cover 1, and are screwed to the front plate 5 of the motor 20 by, for example, a small screw 7 or the like. Further, for example, the sound absorbing material 9' such as a felt, a foam, and a porous body which are produced by a nonwoven fabric or the like is attached or attached to the inner peripheral portion of the cylindrical portion 1a of the waterproof cover. Further, the U-shaped right side of the waterproof cover 1 (on the right side side shown in Fig. 2) is provided with a side opening 1〇 connected to the opening 3 through which the belt 38 passes. Through the side opening 10' provided in the waterproof cover 1, the installation of the belt 38 toward the driving pulley 2 fixed to the motor shaft 39, the V-shaped groove 42 of the belt 38, and the sliding state of the V groove 43 of the driving pulley 2 can be observed. And the slack caused by the change of the tension of the belt 38, and the like. Further, as shown in Fig. 3, the opening portion 3 through which the two belts are viewed is provided above the waterproof cover i. The sound absorbing material 9 is attached to the entire inner circumferential surface of the cylindrical portion 1a of the opening portion 3 of the waterproof cover i. Further, the rib U is formed in the same direction as the direction in which the motor_ extends in the upper side surface of the opening 3 through which the belt 38 of the waterproof cover 1 passes. Thereby, it is possible to prevent the condensation (condensation) of the water such as the water tank from dropping onto the surface I2' of the waterproof cover i and the sliding of the belt groove from the opening W toward the inside of the waterproof cover % and the V groove 43 of the drive pulley 2 Partial invasion. 201217597 As described above, according to the drum type washing machine of the present embodiment, the sliding sound of the belt 38 and the driving pulley 2 due to the rotation of the motor 20 by the waterproof cover 1 is different. Sound occlusion (shadowing). Thereby, the strange sound such as the sliding sound that propagates to the outside of the washing machine body 31 can be remarkably reduced. As a result, it is possible to suppress the unpleasantness given to the user due to the abnormal sound during the operation of the washing machine. Further, according to the drum type washing machine of the present embodiment, the sound absorbing material 9 is attached to the inner peripheral portion of the waterproof cover 1, so that noise such as sliding sound can be absorbed or the occurrence of echo in the water shield 1 can be prevented. As a result, the propagation of the external sound of the washing machine body 31 toward the outside is remarkably reduced. Further, in the drum type washing machine of the present embodiment, the sound absorbing material 9' is attached to the entire circumference of the substantially inner peripheral portion of the waterproof cover 1 except for the opening portion 3 through which the belt 38 passes, whereby the sound of the sliding sound or the like can be effectively absorbed. Moreover, the occurrence of echo or the like can be remarkably suppressed. Further, according to the drum type washing machine of the present embodiment, the periphery of the sliding portion of the V-shaped groove 42 of the belt 38 and the V groove 43 of the drive pulley 2 is covered with the waterproof cover 1 except for the opening portion 3. Therefore, it is possible to effectively reduce the intrusion of moisture that has dripped (condensed) on the outer wall of the outer tub 32 or the like toward the sliding portion. Thereby, the sliding of the V-shaped groove 42 of the belt 38 and the V groove 43 of the drive pulley 2 can be prevented. As a result, it is possible to prevent a decrease in the washing performance due to a change in the number of revolutions of the rotary drum 33 during the washing stroke and the spin-drying stroke. The present invention includes a water tank supported in the washing machine body, a rotating drum supported in the water tank, a motor fixed to the bottom of the water tank, a driving pulley provided at the motor shaft end of the motor, and a rotating shaft fixed at one end to the rotating drum, Solid 201217597 A driven pulley provided at the other end of the rotating shaft, a belt that transmits the rotation of the motor to the driven pulley, and has a configuration in which the waterproof cover covering the outer circumference of the driving pulley is fixed to the motor. Thereby, the noise generated by the sliding friction between the driving pulley and the belt can be prevented from being diffused to the outside, and the "sliding" caused by the moisture to adhere to the sliding portion of the driving pulley and the belt can be prevented. Further, the present invention has a configuration in which a sound absorbing material is attached to an inner peripheral portion of the waterproof cover. Thereby, the noise generated by the sliding friction between the driving pulley and the belt can be effectively absorbed, and the diffusion of noise to the outside can be remarkably reduced. Further, the present invention has a configuration in which a sound absorbing material is mounted around a driving pulley other than an opening through which a belt passes. Thereby, the abnormal sound generated by the sliding friction between the driving pulley and the belt can be effectively absorbed. Further, in the present invention, the sound absorbing material is a felt. Thereby, the noise generated by the sliding friction between the driving pulley and the belt is highly absorbed. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a longitudinal sectional view showing a drum type washing machine in accordance with an embodiment of the present invention. Fig. 2 is an enlarged view of an essential part of the vicinity of the motor shaft of the drum type washing machine (part A of Fig. 1). Fig. 3 is a sectional view taken along line 3-3 of the drum type washing machine in the B direction shown in Fig. 2; Figure 4 is a longitudinal sectional view of a conventional drum type washing machine. Fig. 5 is an enlarged view of an essential part of the vicinity of the motor shaft of the motor of the conventional drum type washing machine (part B of Fig. 4). [Main component symbol description] 1...waterproof cover la...cylinder
10 201217597 2...驅動滑輪 33...旋轉滾筒 3...開口部 34...控制部 4...爪片 35...旋轉軸 5...前板 36...衣服攪拌用隔板 6...安裝座 37...從動滑輪 7...小螺絲 38…皮帶 8...小孔 39...馬達軸 9...吸音材 41...小孔 10...側面開口 42...V狀溝 11...肋體 43…V溝 12...上面 B...方向 20...馬達 D1…直徑 31...洗衣機本體 D2...外徑 32…水槽10 201217597 2... drive pulley 33... rotary drum 3... opening 34... control unit 4... claw piece 35... rotating shaft 5... front plate 36... clothes stirring Separator 6... Mounting seat 37... Follower pulley 7... Small screw 38... Belt 8... Small hole 39... Motor shaft 9... Sound absorbing material 41... Small hole 10. .. side opening 42...V-shaped groove 11...rib 14...V groove 12...upper B...direction 20...motor D1...diameter 31...washing machine body D2...outside Trail 32...sink