Valve timing control device for internal combustion engine, and fastening structure
View Patent ↗A front plate 26 that covers a front end of a housing body is formed from a disk-shaped plate member 41 having in a middle thereof a fitting hole 41 a and a cylindrical member 42 having at inner end part thereof a reduced diameter stepped-shaped fitting portion 42 a that is fitted to the fitting hole 41 a . Stopper portions 44 are formed by crimping a top end side of the fitting portion 42 a fitted to the fitting hole 41 a , and both of the plate member 41 and the cylindrical member 42 are connected and fixed together by the stopper portions 44 engaging with stopper grooves 43 that are formed at an inner end side hole edge of the fitting hole 41 a in a pressed state.
1. A valve timing control device of an internal combustion engine comprising:
a drive rotary member to which a turning force is transmitted from an engine crankshaft;
a driven rotary member rotatably provided relative to the drive rotary member within a predetermined angle range; and
a front plate with which one end of a torsion coil spring that forces the driven rotary member to one side of a rotation direction is engaged, and wherein the front plate has:
a plate member provided so as to cover one end of the drive rotary member and having a circular hole penetrating a middle of the plate member; and
a cylindrical member provided so as to protrude from an outer side surface of the plate member and fixed to the plate member,
wherein a key groove is formed at an inner end edge of the circular hole of the plate member, and
wherein the cylindrical member is connected and fixed to the plate member by inserting and fitting one end portion of the cylindrical member to the circular hole of the plate member from an outer end side of the circular hole and press-deforming a key forming portion that is formed at an end edge of the one end portion of the cylindrical member so that the key forming portion is engaged with the key groove of the plate member.
2. The valve timing control device of the internal combustion engine as claimed in claim 1 , wherein:
a base end portion of the key forming portion is formed so as to be a stepped portion, and
the stepped portion contacts an outer end side hole edge of the circular hole.
3. The valve timing control device of the internal combustion engine as claimed in claim 2 , wherein:
a predetermined minute gap C is provided between a top end of the key forming portion after being press-deformed and an inner side surface of the plate member.
4. The valve timing control device of the internal combustion engine as claimed in claim 3 , wherein:
the key forming portion is formed by being crimped by a punch having a tapered shape.
5. The valve timing control device of the internal combustion engine as claimed in claim 4 , wherein:
the plate member is formed by press-molding.
6. The valve timing control device of the internal combustion engine as claimed in claim 4 , wherein:
the cylindrical member is formed by cutting a metallic conduit to a predetermined length and machining the cut metallic conduit.
7. The valve timing control device of the internal combustion engine as claimed in claim 3 , wherein:
a plurality of key grooves and a plurality of key forming portions corresponding to the plurality of key grooves are provided.
8. The valve timing control device of the internal combustion engine as claimed in claim 7 , wherein:
the key groove and the key forming portion corresponding to the key groove are arranged as a pair at the inner end edge of the circular hole of the plate member.
9. The valve timing control device of the internal combustion engine as claimed in claim 3 , wherein:
a thickness width of the cylindrical member is set to be thinner than a thickness width of the plate member.
10. The valve timing control device of the internal combustion engine as claimed in claim 9 , wherein:
the one end of the torsion coil spring is engaged with the cylindrical member.
11. The valve timing control device of the internal combustion engine as claimed in claim 9 , wherein:
the one end of the torsion coil spring is engaged with the plate member.
12. The valve timing control device of the internal combustion engine as claimed in claim 1 , wherein:
the cylindrical member is fixed to the plate member by bending and deforming a plurality of nail portions that are provided at and protrude from one end edge of the cylindrical member.
13. The valve timing control device of the internal combustion engine as claimed in claim 12 , wherein:
a predetermined minute gap C is provided between a top end of the nail portion after being bended and deformed and an inner side surface of the plate member.
14. The valve timing control device of the internal combustion engine as claimed in claim 13 , wherein:
a plurality of nail portions are provided.
15. The valve timing control device of the internal combustion engine as claimed in claim 14 , wherein:
the nail portion and a key groove formed at an inner end edge of the circular hole are arranged as a pair at the inner end edge of the circular hole of the plate member.
16. The valve timing control device of the internal combustion engine as claimed in claim 1 , wherein:
the cylindrical member is joined to the plate member by friction welding.
17. A fastening structure comprising:
a first member having a penetration hole in a middle of the first member and a key groove at an inner end edge of the penetration hole; and
a second member provided so as to protrude from an outer side surface of the first member and having a key forming portion at a base end portion of the second member, and
the second member being connected and fixed to the first member by press-deforming the key forming portion so that the key forming portion is engaged with the key groove of the first member,
wherein a predetermined minute gap C is provided between a top end of the key forming portion after being press-deformed and an inner side surface of the first member.
18. The fastening structure as claimed in claim 17 , wherein:
a base end portion of the key forming portion is formed so as to be a stepped portion, and
the stepped portion contacts an outer end side hole edge of the penetration hole.