| CPC F16H 7/0829 (2013.01) [F16H 2007/0806 (2013.01)] | 3 Claims |
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1. A chain tensioner comprising:
a tensioner body with a plunger bore that is open on one side;
a cylindrical plunger slidably inserted in the plunger bore; and
a biasing member that biases the plunger in an extension direction,
the plunger including on an outer circumferential surface thereof a plurality of raised portions of the plunger with which a locking member engages,
the plunger bore being provided with a locking member holding part on one side that is open, the locking member holding part being open toward a center axis of the plunger and holding the locking member,
the locking member holding part being provided with an inclined surface at least at one end in a plunger entry direction in which the plunger enters into the plunger bore, the inclined surface becoming progressively shallower in the plunger entry direction,
the locking member holding part is formed in a ring,
the locking member is formed into an endless ring shape,
the locking member forces the plunger in a direction that causes the diameter of the locking member to contract,
the locking member being an elastic member to deform elastically in a cross section inside the locking member holding part to have a cross sectional shape conforming to the inclined surface of the locking member holding part when engaging with the raised portions of the plunger.
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