輪式拖拉機是什么
輪式拖拉機是拖拉機的(de)(de)一類(lei),即行走裝(zhuang)置是輪(lun)子(zi)的(de)(de)拖拉機(ji)(ji)。(別于履帶式拖拉機(ji)(ji))有(you)二輪(lun)(手扶拖拉機(ji)(ji))、四輪(lun)等(deng)多種型式。又分后輪(lun)驅(qu)動和四輪(lun)驅(qu)動。大(da)馬(ma)力輪(lun)式拖拉機(ji)(ji)有(you)較好的(de)(de)牽引性能,適于大(da)農場配(pei)帶寬幅農具進行高速作業。
輪式拖拉機工作原理
拖(tuo)拉(la)(la)(la)機(ji)(ji)能(neng)行(xing)駛是靠(kao)內燃機(ji)(ji)的(de)動(dong)(dong)力(li)經傳動(dong)(dong)系(xi)統(tong),使驅(qu)(qu)(qu)動(dong)(dong)輪(lun)獲得(de)驅(qu)(qu)(qu)動(dong)(dong)扭(niu)矩Mk,獲得(de)驅(qu)(qu)(qu)動(dong)(dong)扭(niu)矩的(de)驅(qu)(qu)(qu)動(dong)(dong)輪(lun)再通過輪(lun)胎花紋和(he)輪(lun)胎表面(mian)(mian)給地(di)面(mian)(mian)小(xiao)、向(xiang)后的(de)水(shui)平作用(yong)力(li)(切線力(li)),而(er)地(di)面(mian)(mian)對驅(qu)(qu)(qu)動(dong)(dong)力(li)大小(xiao)相等、方向(xiang)相反(fan)的(de)水(shui)平反(fan)作用(yong)力(li)Pk,這個(ge)Pk反(fan)作用(yong)力(li)就是推動(dong)(dong)拖(tuo)拉(la)(la)(la)機(ji)(ji)向(xiang)前(qian)(qian)(qian)行(xing)駛的(de)驅(qu)(qu)(qu)動(dong)(dong)力(li)(也稱喂推進力(li))。當驅(qu)(qu)(qu)動(dong)(dong)力(li)Pk足以克服(fu)前(qian)(qian)(qian)后車輪(lun)向(xiang)前(qian)(qian)(qian)滾動(dong)(dong)阻(zu)(zu)力(li)和(he)所(suo)帶農(nong)具的(de)牽(qian)引阻(zu)(zu)力(li)時(shi),拖(tuo)拉(la)(la)(la)機(ji)(ji)便(bian)向(xiang)前(qian)(qian)(qian)行(xing)駛。若將驅(qu)(qu)(qu)動(dong)(dong)輪(lun)支離地(di)面(mian)(mian),即驅(qu)(qu)(qu)動(dong)(dong)力(li)Pk等于零(ling),則驅(qu)(qu)(qu)動(dong)(dong)輪(lun)只能(neng)原地(di)空轉(zhuan),拖(tuo)拉(la)(la)(la)機(ji)(ji)不(bu)能(neng)行(xing)駛;若滾動(dong)(dong)阻(zu)(zu)力(li)與牽(qian)引阻(zu)(zu)力(li)之(zhi)和(he)大于驅(qu)(qu)(qu)動(dong)(dong)力(li)Pk時(shi),拖(tuo)拉(la)(la)(la)機(ji)(ji)也不(bu)能(neng)行(xing)駛。由此可(ke)見輪(lun)式拖(tuo)拉(la)(la)(la)機(ji)(ji)行(xing)駛是由驅(qu)(qu)(qu)動(dong)(dong)扭(niu)矩驅(qu)(qu)(qu)動(dong)(dong)輪(lun)與地(di)面(mian)(mian)間的(de)相互作用(yong)而(er)實現的(de),并且驅(qu)(qu)(qu)動(dong)(dong)力(li)要大于滾動(dong)(dong)阻(zu)(zu)力(li)與牽(qian)引阻(zu)(zu)力(li)之(zhi)和(he)。
輪式拖拉機需要什么駕駛證
不(bu)同形式(shi)的拖拉機(ji)駕(jia)照不(bu)同,根據《拖拉機(ji)駕(jia)駛(shi)證(zheng)申領(ling)和使用(yong)規(gui)定》第八條(tiao)規(gui)定,拖拉機(ji)、聯合收割機(ji)駕(jia)駛(shi)人員準(zhun)予駕(jia)駛(shi)的機(ji)型分為:
1、輪式拖拉機,代(dai)號為G1;
2、手扶拖拉機,代號為K1;
3、履帶(dai)拖拉機(ji),代(dai)號為L;
4、輪式拖拉機運(yun)輸機組,代號為G2(準予駕駛輪式拖拉機);
5、手扶(fu)拖拉機運輸機組(zu),代(dai)號為K2(準予駕駛手扶(fu)拖拉機);
6、輪式聯合收割機,代號為R;
7、履(lv)帶(dai)式聯合(he)收割(ge)機,代號為(wei)S。