Camshaft cover, camshaft assembly, and double-cylinder engine

A double-cylinder engine, comprising a camshaft assembly, the camshaft assembly comprising:

• a first camshaft having an axis;
• a second camshaft having an axis parallel to the axis of the first camshaft;
• and
• a camshaft cover having an integral structure, and comprising a first shaft cover portion, a second shaft cover portion, a first connecting portion and a second connecting portion, the first connecting portion and the second connecting portion being connected between the first shaft cover portion and the second shaft cover portion, and spaced apart axially,
• wherein the first shaft cover portion covers the first camshaft, and the second shaft cover portion covers the second camshaft,
• wherein the first camshaft has a first journal, a second journal and a third journal spaced apart axially, and the second camshaft has a fourth journal, a fifth journal and a sixth journal spaced apart axially:
• the first camshaft is provided with a first shaft shoulder on a side of the first journal facing away from the second journal, and the second camshaft is provided with a second shaft shoulder on a side of the fourth journal facing away from the fifth journal;
• and
• the first shaft cover portion is provided with a first position limiting groove, the second shaft cover portion is provided with a second position limiting groove, the first shaft shoulder is engaged in the first position limiting groove, and the second shaft shoulder is engaged in the second position limiting groove,
• wherein the first camshaft is provided with a first flange on a side of the first shaft shoulder facing away from the first journal, and the first flange and the first shaft shoulder have a spacing denoted as B therebetween;
• and
• the second camshaft is provided with a second flange on a side of the second shaft shoulder facing away from the fourth journal, the second flange and the second shaft shoulder have a spacing denoted as A therebetween, and A≠B.