10 and an inner fixing portion 54 fixed to the inner body 20 are formed on the lost motion spring 50 the outer fixing portion 52 may be fixed to the outer connecting portion 14 of the outer body 10 extending in the width direction of the outer body 10 in order to avoid interference with the inner body 20 since the lost motion spring 50 is wound around the connecting shaft 40 it can be easily fixed to the inner body and there is no need for a specific component for connecting the lost motion spring 50 to the outer body 10 or the inner body 20 for example when the lost motion spring 50 is wound around the pivot shaft of the outer body 10 and a portion of the lost motion spring 50 is connected to the inner body 20 through the rotational shaft of the roller 30 the length of the rotational shaft of the roller 30 may be increased and a specific component may be required to wind the lost motion spring 50 around the pivot shaft of the outer body 10 fig3 is a perspective view showing an outer body coupling hole according to various embodiments of the present invention as shown in fig1 to fig3 the connecting shaft 40 is disposed through the outer connecting portions 14 of the outer body 10 that is outer connecting holes 18 are formed at the outer connecting portions.