Variable valve timing control device

Abstract

A variable valve timing control device includes a driving side rotation member, a driven side rotation member, a fluid pressure chamber, a first flow path and a second flow path allowing a flow of an operation fluid into and out of the fluid pressure chamber, an intermediate member being provided between an inner circumferential surface of the driven side rotation member and an outer circumferential surface of a camshaft, and a contact portion where the intermediate member and the driven side rotation member come in contact with each other at a position between the first flow path and the second flow path when mounting the intermediate member to the camshaft.

1 . A variable valve timing control device, comprising:
 a driving side rotation member configured to synchronously rotate with a driving shaft of an internal combustion engine;   a driven side rotation member provided inwardly of the driving side rotation member to be coaxial with the driving side rotation member, the driven side rotation member integrally rotating with a camshaft for opening and closing a valve of the internal combustion engine;   a fluid pressure chamber defined between the driving side rotation member and the driven side rotation member;   a first flow path and a second flow path allowing a flow of an operation fluid into and out of the fluid pressure chamber to change a relative rotational phase of the driven side rotation member relative to the driving side rotation member between a most advanced angle phase and a most retarded angle phase;   an intermediate member being provided between an inner circumferential surface of the driven side rotation member and an outer circumferential surface of the camshaft, the intermediate member connecting the driven side rotation member and the camshaft; and   a contact portion where the intermediate member and the driven side rotation member come in contact with each other at a position between the first flow path and the second flow path when mounting the intermediate member to the camshaft after mounting the intermediate member and the driven side rotation member to the driving side rotation member after mounting the intermediate member to the driven side rotation member by press-fitting in a state where a space configuring a part of the first flow path is defined between the driven side rotation member and the camshaft and the intermediate member includes a part of the second flow path.   
     
     
         2 . The variable valve timing control device according to  claim 1 , further comprising:
 a control valve being positioned inwardly of the intermediate member in a radial direction, the control valve controlling the operation fluid to flow into and out of the fluid pressure chamber.   
     
     
         3 . The variable valve timing control device according to  claim 1 , wherein the intermediate member is press-fitted to a portion of an inner wall of the driven side rotation member. 
     
     
         4 . The variable valve timing control device according to  claim 3 , wherein the intermediate member is press-fitted to the inner wall of the driven side rotation member at a plurality of positions being equally spaced apart along a circumferential direction relative to an axis. 
     
     
         5 . The variable valve timing control device according to  claim 3 , wherein the intermediate member is fitted only to a portion positioned between a portion where the second flow path is formed and the contact portion of the inner wall. 
     
     
         6 . The variable valve timing control device according to  claim 3 , wherein:
 the driven side rotation member includes a plurality of press-fitting portions being irregularly positioned along a circumferential direction of the driven side rotation member, the plurality of press-fitting portions coming in contact with the intermediate member when press-fitting to the intermediate member; and   a length from the press-fitting portion to a center of the driven side rotation member is shorter than a length from the inner wall to the center of the driven side rotation member.