# US 11,898,471 B2 · Valve timing adjustment device

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- Number: US 11,898,471 B2
- Document ID: US11898471B2
- Status: Granted
- Kind: B2
- Application number: 17/483,605
- Filed: 2021-09-23
- Published: 2022-01-13
- Granted: 2024-02-13
- Earliest claimed: 2019-03-25
- Assignees: Denso Corporation
- Applicants: Denso Corporation
- Inventors: Futoshi Kawamura
- Web page: https://patentgrep.com/patent/US11898471B2

## CPC

- F01L 1/3442: {using hydraulic chambers with variable volume to transmit the rotating force}
- F01L 1/022: {Chain drive}
- F16K 11/07: with cylindrical slides
- F16K 27/041: {cylindrical slide valves}
- F01L 2001/34426: {Oil control valves}
- F01L 2001/34456: {Locking in only one position}
- F01L 2301/00: Using particular materials
- F01L: CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F16K: VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING {(devices for emptying and evacuating the excess liquid in valves or conduits F16L55/07)}

## Abstract

A valve timing adjustment device includes a vane rotor and a hydraulic oil control valve. The vane rotor is fixed to an end portion of one of a drive shaft and a driven shaft and defines a through hole. The hydraulic oil control valve includes a sleeve and a spool. The sleeve includes a body portion in the through hole and a fixing portion fixed into a shaft fixing hole defined in the one. At least a portion of the through hole is sealed by the body portion. A difference between a radial dimension of the shaft fixing hole and a radial dimension of the fixing portion is greater than a total of a predetermined coaxiality between the through hole and the shaft fixing portion and a predetermined coaxiality between the body portion and the fixing portion.

## Claims

### Claim 1

A valve timing adjustment device configured to adjust valve timing of a valve in an internal combustion engine, the valve being configured to be selectively opened and closed by a driven shaft to which a driving force is transmitted from a drive shaft, the valve timing adjustment device comprising:
a vane rotor that is fixed to an end portion of the driven shaft, that is configured to rotate together with the driven shaft, and that is configured to alter a phase of the driven shaft relative to the drive shaft according to a pressure of a hydraulic oil supplied from a hydraulic oil supply source, the vane rotor defining a through hole passing through the vane rotor in an axial direction;
a hydraulic oil control valve that is configured to perform a flow control of the hydraulic oil, the flow control including a control to supply the hydraulic oil to the vane rotor and a control to discharge the hydraulic oil from the vane rotor, the hydraulic oil control valve including:
a tubular sleeve that includes a body portion disposed in the through hole and a fixing portion inserted and fixed into a shaft fixing hole, the shaft fixing hole being defined in the end portion of the driven shaft; and
a spool that is configured to slidably move in the axial direction within the sleeve, wherein
at least a portion of the through hole in the axial direction is sealed by the body portion,
a difference between a radial dimension of the shaft fixing hole and a radial dimension of the fixing portion is greater than a total of a predetermined coaxiality between the through hole and the shaft fixing hole and a predetermined coaxiality between the body portion and the fixing portion, and
the total is greater than zero.

### Claim 2 (depends on 1)

The valve timing adjustment device according to claim 1, wherein
the fixing portion includes a male thread portion configured to be engaged with a female thread portion formed in the shaft fixing hole, and
a difference between an effective diameter of the female thread portion and an effective diameter of the male thread portion is greater than the total.