| 摘要 |
A return spring 35 is formed using a compression coil spring that is installed so that its axial direction is an up-down direction. The return spring 35 is provided in a high-pressure chamber 14 , and powers a plunger 20 in an upwards direction. A coil diameter of the return spring 35 varies along the axial direction. When the return spring 35 is in a maximally compressed state, an axial direction dimension (up-down direction dimension) is smaller than a dimension that is a thickness of a spring wire 36 multiplied by the number of coil turns. Hence, an overall height of a lash adjuster A can be reduced in comparison to when a return spring with a constant coil diameter over an entire length is used.
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