Variable valve timing system

Patent metadata

Field	Value
Publication number	US-12091994-B2
Application number	US-202318155525-A
Country	US
Kind code	B2
Filing date	Jan 17, 2023
Priority date	Feb 10, 2022
Publication date	Sep 17, 2024
Grant date	Sep 17, 2024

Abstract

There is provided a variable valve timing system including: an intake side camshaft and an exhaust side camshaft disposed on a cylinder head; and a variable valve device attached to one end portion of the intake side camshaft. The accommodating wall on an exhaust side of the cylinder head is positioned more inward in a vehicle width direction than the accommodating wall on an intake side of the cylinder head. A first bolt for fixing the intake side of the cylinder head to a cylinder is disposed more inward in the vehicle width direction than the accommodating wall on the intake side. A second bolt for fixing the exhaust side of the cylinder head to the cylinder is disposed more outward in the vehicle width direction than the accommodating wall on the exhaust side.

First claim

What is claimed is:

1. A variable valve timing system for an engine in which a cylinder head on a cylinder is suspended on a vehicle body frame, the variable valve timing system comprising:
an intake side camshaft and an exhaust side camshaft disposed on the cylinder head; and
a variable valve device attached to one end portion of the intake side camshaft, wherein
in a side view of a vehicle, when a side where the intake side camshaft is disposed is defined as an intake side of the cylinder head, and a side where the exhaust side camshaft is disposed is defined as an exhaust side of the cylinder head, in accommodating walls of the cylinder head which cover the intake side camshaft and the exhaust side camshaft from a side, the accommodating wall on the exhaust side is positioned more inward in a vehicle width direction than the accommodating wall on the intake side,
a first bolt for fixing the intake side of the cylinder head to the cylinder is disposed more inward in the vehicle width direction than the accommodating wall on the intake side, and
a second bolt for fixing the exhaust side of the cylinder head to the cylinder is disposed more outward in the vehicle width direction than the accommodating wall on the exhaust side.

2. The variable valve timing system according to claim 1 , wherein
the second bolt is disposed below the exhaust side camshaft and disposed more outward in the vehicle width direction than the first bolt.

3. The variable valve timing system according to claim 1 , wherein
the vehicle body frame includes a main frame configured to laterally cover the intake side of the cylinder head and a down frame configured to laterally cover the exhaust side of the cylinder head, and
in a front view of the vehicle, the second bolt is positioned more inward in the vehicle width direction than the accommodating wall on the intake side and between the accommodating wall on the exhaust side and the down frame.

4. The variable valve timing system according to claim 1 , comprising:
an oil control valve configured to control a hydraulic pressure with respect to the variable valve device, wherein
the oil control valve is disposed on an outer wall of the cylinder, and
a part of the oil control valve is positioned below the second bolt.

5. The variable valve timing system according to claim 1 , comprising:
an oil control valve configured to control a hydraulic pressure with respect to the variable valve device, wherein
an oil path for hydraulic pressure control passes between the first bolt and the second bolt and extends from the oil control valve to the variable valve device.

6. The variable valve timing system according to claim 5 , wherein
the oil path is positioned on a straight line connecting centers of the first bolt and the second bolt.

Assignees

• Suzuki Motor Corp

Inventors

• Takashiba Yasuto

Classifications

• F02F7/006

  Camshaft or pushrod housings · CPC title

• F02F2007/0063

  Head bolts; Arrangements of cylinder head bolts · CPC title

• F01L2001/34426

  Oil control valves · CPC title

• Y02T10/12

  Improving ICE efficiencies · CPC title

• F01L2001/3443

  Solenoid driven oil control valves · CPC title