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US 10,851,680 B2Granted
Internal combustion engine and vehicle
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorYasuo Okamoto
Life of this patent
Estimating the term…
Abstract
An internal combustion engine allows easy installment of a support that pivotally supports a rocker arm while preventing fretting wear due to rising of the support. The internal combustion engine includes the support, at least a portion of which is located in a hole of a cylinder head, a rocker arm that is pivotally supported on the support, and a ball plunger that secures the support inside the hole. The ball plunger includes a spring seat that contacts with the support, a ball that contacts with the cylinder head, and a spring interposed between the spring seat and the ball.
Claims9
An internal combustion engine comprising:
- a cylinder head including a hole;
- a port in the cylinder head;
- a valve in the cylinder head configured to open/close the port;
- a cam shaft rotatably supported on the cylinder head;
- a cam provided on the cam shaft;
- a columnar support at least partially located in the hole;
- a rocker arm including a supported portion pivotally supported on the columnar support, a pressed portion pressed by the cam, and an abutting portion that abuts on the valve;
- a retainer that includes a first contact portion that contacts with the columnar support, a second contact portion that contacts with the cylinder head, and an elastic portion interposed between the first contact portion and the second contact portion;
- and
- a groove provided on an inner surface of the hole and that engages with the retainer;
- wherein
- the retainer secures the columnar support inside the hole;
- the retainer further includes a plunger including a spring located inside the columnar support, and a presser at least partially located outside the columnar support and that is connected to the spring;
- and
- in a cross section that passes through the groove and a center line of the hole, the groove includes a sloped surface that is inclined relative to the center line and extends upward toward the rocker arm.
12 more elements
An internal combustion engine comprising:
- a cylinder head including a hole;
- a port in the cylinder head;
- a valve in the cylinder head configured to open/close the port;
- a cam shaft rotatably supported on the cylinder head;
- a cam provided on the cam shaft;
- a columnar support at least partially located in the hole;
- a rocker arm including a supported portion pivotally supported on the columnar support, a pressed portion pressed by the cam, and an abutting portion that abuts on the valve;
- and
- a retainer that includes a first contact portion that contacts with the columnar support, a second contact portion that contacts with the cylinder head, and an elastic portion interposed between the first contact portion and the second contact portion;
- wherein
- the retainer secures the columnar support inside the hole;
- and
- the retainer further includes a ring-shaped coil spring that is wound around the columnar support.
10 more elements
An internal combustion engine comprising:
- a cylinder head including a hole;
- a port in the cylinder head;
- a valve in the cylinder head configured to open/close the port;
- a cam shaft rotatably supported on the cylinder head;
- a cam provided on the cam shaft;
- a columnar support at least partially located in the hole;
- a rocker arm including a supported portion pivotally supported on the columnar support, a pressed portion pressed by the cam, and an abutting portion that abuts on the valve;
- and
- a retainer that includes a first contact portion that contacts with the columnar support, a second contact portion that contacts with the cylinder head, and an elastic portion interposed between the first contact portion and the second contact portion;
- wherein
- the retainer secures the columnar support inside the hole;
- and
- the retainer further includes a plunger including a spring located inside the cylinder head, and a presser at least partially located inside the hole and that is connected to the spring.
10 more elements
An internal combustion engine comprising:
- a cylinder head including a hole;
- a port in the cylinder head;
- a valve in the cylinder head configured to open/close the port;
- a cam shaft rotatably supported on the cylinder head;
- a cam provided on the cam shaft;
- a columnar support at least partially located in the hole;
- a rocker arm including a supported portion pivotally supported on the columnar support, a pressed portion pressed by the cam, and an abutting portion that abuts on the valve;
- and
- a retainer that includes a first contact portion that contacts with the columnar support, a second contact portion that contacts with the cylinder head, and an elastic portion interposed between the first contact portion and the second contact portion;
- wherein
- the retainer secures the columnar support inside the hole;
- and
- the retainer further includes a ring-shaped coil spring that is fitted to an inner surface of the hole.
10 more elements
An internal combustion engine comprising:
- a cylinder head including a hole;
- a port in the cylinder head;
- a valve in the cylinder head configured to open/close the port;
- a cam shaft rotatably supported on the cylinder head;
- a cam provided on the cam shaft;
- a columnar support at least partially located in the hole;
- a rocker arm including a supported portion pivotally supported on the columnar support, a pressed portion pressed by the cam, and an abutting portion that abuts on the valve;
- and
- a retainer that includes a first contact portion that contacts with the columnar support, a second contact portion that contacts with the cylinder head, and an elastic portion interposed between the first contact portion and the second contact portion;
- wherein
- the retainer secures the columnar support inside the hole;
- and
- the retainer further includes a leaf spring that is secured to an edge of the hole.
10 more elements
Dependencies are inferred from the claim text.