靠背輪聯(lián)軸器用來將不同機(jī)構(gòu)中的主動(dòng)軸和從動(dòng)軸牢固地聯(lián)接起來一同旋轉(zhuǎn)，并傳遞運(yùn)動(dòng)和扭矩的機(jī)械部件。有時(shí)也用以聯(lián)接軸與其他零件（如齒輪、帶輪等）。

靠背輪常由兩半合成，分別用鍵或緊配合等聯(lián)接，緊固在兩軸端，再通過某種方式將兩半聯(lián)接起來。

靠背輪聯(lián)軸器可兼有補(bǔ)償兩軸之間由于制造安裝不精確、工作時(shí)的變形或熱膨脹等原因所發(fā)生的偏移（包括軸向偏移、徑向偏移、角偏移或綜合偏移）；以及緩和沖擊、吸振。

靠背輪為俗稱，專業(yè)叫法為聯(lián)軸器以及法蘭，用于機(jī)械設(shè)備的連接。

柱銷聯(lián)軸器是利用一端套有彈性套（橡膠材料）的柱銷，裝在兩半聯(lián)軸器凸緣孔中，以實(shí)現(xiàn)兩半聯(lián)軸器的聯(lián)接。

彈性柱銷聯(lián)軸器是一種結(jié)構(gòu)簡單制造容易，無需潤滑，裝拆彈性柱銷便捷的傳動(dòng)基礎(chǔ)件，利用兩個(gè)帶法蘭孔的半聯(lián)和置于起重的非金屬彈性柱銷來傳遞扭矩，適用于中低速和中低扭矩場合。

彈性柱銷齒式聯(lián)軸器采用非金屬彈性柱銷和兩個(gè)帶齒形半聯(lián)以及一個(gè)外圈的齒形套環(huán)設(shè)計(jì)，利用非金屬彈性的變形來傳遞扭矩同時(shí)緩沖減震，補(bǔ)償角向位移。

彈性套柱銷聯(lián)軸器設(shè)計(jì)簡單巧妙，適用性較廣的聯(lián)軸器，利用帶彈性套的柱銷聯(lián)接兩個(gè)帶銷孔的半聯(lián)，實(shí)現(xiàn)扭矩傳遞的同時(shí)兼具較大的角向補(bǔ)償，同時(shí)減震緩沖性能良好，可以用在速度較快的場合，無需潤滑，銷套更換便捷。

The pin gear coupling is designed with non-metallic flexible pin, two toothed semi-couplings and a toothed sleeve ring with an outer ring. It uses non-metallic flexible deformation to transfer torque and cushion shock and compensate angular displacement. The flexible pin coupling is a basic transmission parts that has simple structure, needs no lubrication, and is easy to manufacture, install and disassemble the flexible pin. It uses two semi-couplings with flange holes and a non-metallic flexible pin for crane to transmit torque, suitable for low-to-medium speed and low-to-medium torque occasions. The design of the elastic sleeve pin coupling is simple and clever in design and has wide applicability. It uses the pin with elastic sleeve to connect two semi-couplings with pin holes to realize torque transmission and larger angular compensation. At the same time, Pin and bush couplings has good shock absorption and buffering performance, which can be used in high-speed occasions without lubrication and requiring easy pin sleeve replacement.