鼓形齒式聯軸器屬于剛撓性聯軸器，齒式聯軸器是由齒數相同的內齒圈和帶外齒的凸緣半聯軸器等零件組成。外齒分為直齒和鼓形齒兩種齒形，所謂鼓形齒即為將外齒制成球面，球面中心在齒輪軸線上，齒側間隙較一般齒輪大，鼓形齒聯軸器可允許較大的角位移（相對于直齒聯軸器），可改善齒的接觸條件，提高傳遞轉矩的能力，延長使用壽命。有角位移時沿齒寬的接觸狀態。具有徑向、軸向和角向等軸線偏差補償能力，具有結構緊湊、回轉半徑小、承載能力大、傳動效率高、噪聲低及維修周期長等優點，特別適用于低速重載工況，如冶金、礦山、起重運輸等行業、也適用于石油、化工、通用機械等各類機械的軸系傳動
齒式聯軸器在工作時，兩軸產生相對角位移，內外齒的齒面周期性作軸向相對滑動，必然形成齒面磨損和功率消耗，因此，齒式聯軸器需在有良好和密封的狀態下工作。齒式聯軸器徑向尺寸小，承載能力大，常用于低速重載工況條件的軸系傳動，高精度并經動平衡的齒式聯軸器可用于高速傳動，如燃汽輪機的軸系傳動。由于鼓形齒式聯軸器角向補償大于直齒式聯軸器，國內外均廣泛采用鼓形齒式聯軸器，直齒式聯軸器屬于被淘汰的產品，選用者應盡量不選用。
鼓形齒式聯軸器的特點(與直齒式聯軸器相比有以下特點) ：
1、承載能力強。在相同的內齒套外徑和聯軸器最大外徑下，鼓形齒式聯軸器的承載能力平均比直齒式聯軸器提高15～20％
2、角位移補償量大。當徑向位移等于零時，直齒式聯軸器的許用角位移為1o，而鼓形齒式聯軸器的許用角位移為1o30'，提高50％。在相同的模數、齒數、齒寬下，鼓形齒比直齒允許的角位移大,
3、鼓形齒面使內、外齒的接觸條件得到改善，避免了在角位移條件下直齒齒端棱邊擠壓，應力集中的弊端，同時改善了齒面摩擦、磨損狀況，降低了噪聲，維修周期長。
4、外齒套齒端呈喇叭形狀，使內、外齒裝拆十分方便。
5、傳動效率高達99.7%。
基于經上特點，目前，國內外已普遍以鼓形齒替代直齒式聯軸器。
The drum gear coupling is a flexible coupling, and the gear coupling is made up of the same inner tooth ring and the flange half coupling of the outer tooth. Divided into straight teeth and drum tooth outside two kinds of tooth shape, tooth is the so-called drum will made spherical outer teeth, spherical center on the gear axis, backlash is generally large gear, drum gear couplings allows a larger angular displacement (as opposed to straight tooth coupling), can improve the tooth contact conditions, improve the ability to transfer torque, prolong service life. The contact state along the tooth width in angular displacement. Radial, axial and angular axis deviation compensation ability, has a compact structure, small turning radius, large carrying capacity, high transmission efficiency, low noise and long maintenance cycle, especially suitable for the condition of low speed and heavy loading, such as metallurgy, mining, lifting transportation and other industries, can also be applied to petroleum, chemical industry, general machinery and other kinds of shaft transmission of machine
Type coupling at work, two relative angular displacement of the shaft of the internal and external gear tooth surface of periodic axial relative sliding, inevitable formation of tooth surface wear and power consumption, therefore, the coupling should be in good and sealing state work. Type coupling radial size is small, large carrying capacity, often used for shaft transmission of working condition of low speed and heavy loading, high precision and the dynamic balance of coupling can be used for high-speed transmission, such as gas turbine shaft transmission. Because the drum type coupling Angle is greater than the direct coupling to the compensation, both at home and abroad widely used drum type coupling, straight type coupling are eliminated products, choose those should not choose as far as possible.
The characteristics of drum gear coupling (compared with the straight gear coupling) :
1. Strong carrying capacity. The load capacity of drum gear coupling is 15 ~ 20% higher than that of the straight gear coupling in the same inner tooth casing and the coupling maximum outside diameter
2. The offset of angular displacement is large. When the radial displacement is equal to zero, the allowable angular displacement of the direct tooth coupling is 1o, while the allowable angular displacement of the drum gear coupling is 1o30 ', which is increased by 50%. Under the same modulus, teeth, and width of the teeth, the drum teeth are larger than the allowed angular displacement of the straight teeth.
3, drum gear tooth surface of internal and external tooth contact conditions improved, avoided under the condition of angular displacement straight tooth gear tooth edge extrusion, the disadvantages of stress concentration, and at the same time improve the tooth surface friction, wear, reduced the noise, maintenance cycle is long.
4. The outer teeth of the outer teeth are honked in shape, making it convenient for the inside and outer teeth to be removed.
5. The transmission efficiency is up to 99.7%.
Based on the characteristics of the current, it is widely used to replace the straight tooth coupling with drum teeth.
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