1.制(zhi)動(dong)盤直徑(jing)
　　制(zhi)動(dong)盤直(zhi)徑D應(ying)盡可能取(qu)(qu)大些，這時制(zhi)動(dong)盤的有效半徑得到增加，可以降低制(zhi)動(dong)鉗的夾(jia)緊力，減少襯塊的單位壓力和工(gong)作溫(wen)度。受(shou)輪輞(wang)直(zhi)徑的***，制(zhi)動(dong)盤的直(zhi)徑通常選擇(ze)為輪輞(wang)直(zhi)徑的70%一79%。總(zong)質量大于2t的汽車應(ying)取(qu)(qu)上限。
　　2.制動盤(pan)厚度
　　制(zhi)(zhi)(zhi)(zhi)動(dong)(dong)(dong)盤(pan)厚(hou)度(du)對制(zhi)(zhi)(zhi)(zhi)動(dong)(dong)(dong)盤(pan)質量(liang)(liang)和(he)工作時(shi)的溫升有影響(xiang)。為(wei)使質量(liang)(liang)小(xiao)些，制(zhi)(zhi)(zhi)(zhi)動(dong)(dong)(dong)盤(pan)厚(hou)度(du)不宜取得(de)很(hen)大；為(wei)了(le)(le)降低溫度(du)，制(zhi)(zhi)(zhi)(zhi)動(dong)(dong)(dong)盤(pan)厚(hou)度(du)又不宜取得(de)過小(xiao)。制(zhi)(zhi)(zhi)(zhi)動(dong)(dong)(dong)盤(pan)可以做成(cheng)實心(xin)(xin)的，或(huo)者為(wei)了(le)(le)散(san)熱(re)通(tong)風(feng)的需要(yao)在制(zhi)(zhi)(zhi)(zhi)動(dong)(dong)(dong)盤(pan)中間鑄出(chu)通(tong)風(feng)孔道。一般實心(xin)(xin)制(zhi)(zhi)(zhi)(zhi)動(dong)(dong)(dong)盤(pan)厚(hou)度(du)可取為(wei)10—20mm，通(tong)風(feng)式制(zhi)(zhi)(zhi)(zhi)動(dong)(dong)(dong)盤(pan)厚(hou)度(du)取為(wei)20～50mm，采用較多的是(shi)20—30mm。在高速(su)運動(dong)(dong)(dong)下緊急制(zhi)(zhi)(zhi)(zhi)動(dong)(dong)(dong)，制(zhi)(zhi)(zhi)(zhi)動(dong)(dong)(dong)盤(pan)會形(xing)成(cheng)熱(re)變形(xing)，產生顫抖。為(wei)提高制(zhi)(zhi)(zhi)(zhi)動(dong)(dong)(dong)盤(pan)摩(mo)擦面的散(san)熱(re)性(xing)能，大多把制(zhi)(zhi)(zhi)(zhi)動(dong)(dong)(dong)盤(pan)做成(cheng)中間空洞的通(tong)風(feng)式制(zhi)(zhi)(zhi)(zhi)動(dong)(dong)(dong)盤(pan)，這樣可使制(zhi)(zhi)(zhi)(zhi)動(dong)(dong)(dong)盤(pan)溫度(du)降低20%～30%..。