Electromagnet and urea injection system

The utility model discloses an electromagnet which comprises a sliding rod shaft and a spring cover plate. An elastic buffer ring is arranged between the sliding rod shaft and the spring cover plate.In the working process of the electromagnet, at the moment when the sliding rod shaft collides with the spring cover plate, the end face of the spring cover plate or the end face of the sliding rod shaft makes contact with the elastic buffer ring firstly, noise generated in the rigid collision process is avoided, and the noise reduction effect is obvious in the actual test. According to the scheme, the use comfort of passenger vehicles such as passenger cars is improved. The utility model further discloses a urea injection system comprising the electromagnet. 本实用新型公开了一种电磁铁包括滑杆轴和弹簧盖板，所述滑杆轴和所述弹簧盖板之间设置有弹性缓冲圈。电磁铁在工作过程中，滑杆轴与弹簧盖板发生撞击的瞬间，弹簧盖板或滑杆轴的端面首先接触弹性缓冲圈，避免了刚性撞击过程中产生的噪音，实际测试中降低噪音效果明显。本方案提高了客车等乘用车的使用舒适性。本实用新型还公开了一种包括上述电磁铁的尿素喷射系统。