Tsimikizirani maulalo achikasu a 3 pamndandanda wanthawi. Ikani unyolo wanthawi ndi crankshaft sprocket. Ulalo woyamba wachikasu umagwirizanitsa chizindikiro cha nthawi ya crankshaft sprocket. Zindikirani: Pali maulalo achikasu atatu pamndandanda wanthawi. Awiri mwa maulalo achikasu (okhala ndi kusiyana kwa maulalo a 6) amagwirizana ndi zizindikiro zanthawi yakudya ndi kutulutsa ma sprockets a camshaft.

Liwiro la injini likatsika, chowongolera nthawi ya ma valve chimatsika, unyolo wakumtunda umamasuka, ndipo unyolo wapansi umagwira ntchito pa kukoka kwa kamera yakutulutsa ndi kukankhira pansi kwa wowongolera. Chifukwa chakuti camshaft yotulutsa mpweya sichingayende mozungulira pansi pa lamba wa nthawi ya crankshaft, camshaft yolowera imayikidwa pamagulu awiri: imodzi ndi yakuti kusinthasintha kwabwino kwa camshaft yotulutsa mpweya kumayendetsa mphamvu yokoka ya unyolo wapansi; ina ndi The regulator amakankhira unyolo ndi kupatsira mphamvu yokoka ku exhaust cam. Camshaft yolowera imazungulira ngodya yowonjezera θ molunjika, yomwe imathandizira kutseka kwa valve yolowera, ndiko kuti, valavu yolowera mochedwa kutseka angle imachepetsedwa ndi θ madigiri. Pamene liwiro likuwonjezeka, wowongolera amakwera ndipo unyolo wapansi umamasuka. The exhaust camshaft imazungulira mozungulira. Choyamba, unyolo wapansi uyenera kumangika kuti ukhale wolimba kwambiri kuti camshaft yolowera isanayendetsedwe kuti izungulire ndi camshaft yotulutsa. Pang'onopang'ono unyolo wapansi umakhala womasuka komanso wolimba, camshaft yotulutsa mpweya imazungulira pa ngodya θ, kamera yolowera imayamba kusuntha, ndipo kutseka kwa valve yolowetsa kumakhala pang'onopang'ono.

Zotsatirazi ndi phunziro la kukhazikitsa kwa nthawi:
1. Choyamba gwirizanitsani chizindikiro cha nthawi pa camshaft sprocket ndi chizindikiro cha nthawi pachivundikirocho;
2. Tembenuzirani chibowocho kuti pisitoni ya silinda imodzi ikhale pakatikati pakufa;
3. Ikani chingwe cha nthawi kuti chizindikiro cha nthawi ya unyolo chigwirizane ndi chizindikiro cha nthawi pa camshaft sprocket;
4. Ikani sprocket yoyendetsa pampu ya mafuta kuti chizindikiro cha nthawi ya unyolo chigwirizane ndi chizindikiro cha nthawi pa sprocket ya mafuta.