A mechanical system, comprising a support element, a pin extending along a first axis and comprising two opposite ends, each adapted to be fitted in the support element for radial retention of the pin relative to the first axis, and a roller element movable in rotation relative to the pin around the first axis. The mechanical system includes two ribs resting on either side of the ends for axial retention of the pin along the first axis. The mechanical system can be integrated into either an injection pump or a valve actuator.

A mechanical system, comprising a support element, a pin extending along a first axis and comprising two opposite ends, each adapted to be fitted in the support element for radial retention of the pin relative to the first axis, and a roller element movable in rotation relative to the pin around the first axis. The mechanical system includes two ribs resting on either side of the ends for axial retention of the pin along the first axis. The mechanical system can be integrated into either an injection pump or a valve actuator.

The pump gear to be mounted on an input shaft 3 of a supply pump 2 that pumps fuel has a hollow portion 8 that is open to a distal end side in an axial C direction and a tapered surface 9 that is formed on an inner peripheral surface of the hollow portion and gradually increases in diameter as it extends from a base end side toward the distal end side in the axial direction. The tapered surface is configured such that a focusing point F1 of sound radiation S1 radiating perpendicularly from a distal end portion in the axial direction 15 of the tapered surface is positioned at a distal endmost position P4 in the axial direction of the hollow portion or at a position closer to the base end side in the axial direction than the distal endmost position in the axial direction.

The pump gear to be mounted on an input shaft 3 of a supply pump 2 that pumps fuel has a hollow portion 8 that is open to a distal end side in an axial C direction and a tapered surface 9 that is formed on an inner peripheral surface of the hollow portion and gradually increases in diameter as it extends from a base end side toward the distal end side in the axial direction. The tapered surface is configured such that a focusing point F1 of sound radiation S1 radiating perpendicularly from a distal end portion in the axial direction 15 of the tapered surface is positioned at a distal endmost position P4 in the axial direction of the hollow portion or at a position closer to the base end side in the axial direction than the distal endmost position in the axial direction.

The pump gear to be mounted on an input shaft 3 of a supply pump 2 that pumps fuel has a hollow portion 8 that is open to a distal end side in an axial C direction and a tapered surface 9 that is formed on an inner peripheral surface of the hollow portion and gradually increases in diameter as it extends from a base end side toward the distal end side in the axial direction. The tapered surface is configured such that a focusing point F1 of sound radiation Si radiating perpendicularly from a distal end portion in the axial direction 15 of the tapered surface is positioned at a distal endmost position P4 in the axial direction of the hollow portion or at a position closer to the base end side in the axial direction than the distal endmost position in the axial direction.

The pump gear to be mounted on an input shaft 3 of a supply pump 2 that pumps fuel has a hollow portion 8 that is open to a distal end side in an axial C direction and a tapered surface 9 that is formed on an inner peripheral surface of the hollow portion and gradually increases in diameter as it extends from a base end side toward the distal end side in the axial direction. The tapered surface is configured such that a focusing point F1 of sound radiation Si radiating perpendicularly from a distal end portion in the axial direction 15 of the tapered surface is positioned at a distal endmost position P4 in the axial direction of the hollow portion or at a position closer to the base end side in the axial direction than the distal endmost position in the axial direction.

A connector includes: a connector body formed in a tubular shape; a valve housing formed in a tubular shape and provided inside the connector body with a seal structure interposed therebetween, the seal structure restricting flow of fuel between the valve housing and an inner circumferential surface of the connector body; and a valve body stored inside the valve housing, the valve body being configured to, when high-pressure fuel does not flow back, come into a first state in which a forward flow path is formed between the valve body and an inner circumferential surface of the valve housing by a pressure of low-pressure fuel, and when the high-pressure fuel flows back, come into a second state in which an orifice flow path having a smaller flow path sectional area than the forward flow path is formed between the valve body and the inner circumferential surface of the valve housing.

A connector includes: a connector body formed in a tubular shape; a valve housing formed in a tubular shape and provided inside the connector body with a seal structure interposed therebetween, the seal structure restricting flow of fuel between the valve housing and an inner circumferential surface of the connector body; and a valve body stored inside the valve housing, the valve body being configured to, when high-pressure fuel does not flow back, come into a first state in which a forward flow path is formed between the valve body and an inner circumferential surface of the valve housing by a pressure of low-pressure fuel, and when the high-pressure fuel flows back, come into a second state in which an orifice flow path having a smaller flow path sectional area than the forward flow path is formed between the valve body and the inner circumferential surface of the valve housing.

A connector includes: a connector body formed in a tubular shape; and a valve body stored inside the connector body, the valve body being configured to, when high-pressure fuel does not flow back, come into a first state in which a forward flow path is formed between the valve body and an inner circumferential surface of the connector body by a pressure of low-pressure fuel, and when high-pressure fuel flows back, come into a second state in which an orifice flow path having a smaller flow path sectional area than the forward flow path is formed between the valve body and the inner circumferential surface of the connector body.

A connector includes: a connector body formed in a tubular shape; and a valve body stored inside the connector body, the valve body being configured to, when high-pressure fuel does not flow back, come into a first state in which a forward flow path is formed between the valve body and an inner circumferential surface of the connector body by a pressure of low-pressure fuel, and when high-pressure fuel flows back, come into a second state in which an orifice flow path having a smaller flow path sectional area than the forward flow path is formed between the valve body and the inner circumferential surface of the connector body.