One of the most repeated verses of Koran is surah 4 an Nisa ( Women), verse 34: " Men are in charge of women by right of what Allah has given one over the other and what they spend from their wealth. So righteous women are devoutly obedient guarding in the husband's absence But those from whom you fear arrogance advise them ; then forsake them in bed and finally strike them. But if they obey you seek no means against them. Indeed Allah is ever exalted and grand."
It is true that Muslim men are allowed to hit women who are disobedient. However hitting was offered as a last resort. First men have to advise these women, second forsake them in bed (That does not punish a man who has other wives) and lastly hitting. The first part of the verse explains that men are in charge of women as long as they spend on them. In a modern couple's life where the woman shares the expenses, the man loses his right to punish the woman.