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A structure for attaching a motor cylinder device to the body of the vehicle, said vehicle brake system including: an input device via which an operator inputs brake operations; and a motor cylinder device that generates hydraulic brake pressure on the basis of electrical signals based on said brake

A structure for attaching a motor cylinder device to the body of the vehicle, said vehicle brake system including: an input device via which an operator inputs brake operations; and a motor cylinder device that generates hydraulic brake pressure on the basis of electrical signals based on said brake operations. Said motor cylinder device has: an electric motor that operates on the basis of electrical signals; a driving-force transmission unit that transmits driving force from the electric motor; and a cylinder mechanism that applies pressure to a brake fluid by moving a piston axially by means of the driving force transmitted by the driving-force transmission unit. A mount for attaching the motor cylinder device to the body of the vehicle is provided near the center of gravity of the motor cylinder device. This makes it possible to minimize displacement of the electric brake actuator when subjected to vibration.

대표청구항 ▼

1. A vehicle body attachment structure for an electric brake actuator for a vehicle brake system including an input device to which braking operation by an operator is input and an electric brake actuator for generating a hydraulic brake pressure, based on at least an electric signal according to th

1. A vehicle body attachment structure for an electric brake actuator for a vehicle brake system including an input device to which braking operation by an operator is input and an electric brake actuator for generating a hydraulic brake pressure, based on at least an electric signal according to the braking operation, wherein the electric brake actuator includes:an electric motor that drives, based on the electric signal;a driving force transmission section for transmitting a driving force of the electric motor; anda cylinder mechanism for applying a pressure to brake fluid by moving a piston along an axial direction by the driving force transmitted from the driving force transmission section,wherein a mount portion for attaching the electric brake actuator to a vehicle body is provided in a vicinity of a center of gravity of the electric brake actuator;wherein:the electric brake actuator is provided with a penetration hole penetrating along a direction substantially perpendicular to an axial line of the cylinder mechanism,the electric brake actuator is supported by a fixing member penetrating through the penetration hole;a first boss portion is provided at one end portion along an axial direction of the penetration hole;a second boss portion is provided at another end portion along the axial direction of the penetration hole; anda third boss portion is provided along a vertical downward direction perpendicular to the axial line of the penetration hole,and wherein the electric brake actuator is supported at three points formed by the first to third boss portions. 2. The vehicle body attachment structure, for an electric brake actuator, according to claim 1, wherein the mount portion is provided at a portion that is arranged separable from the cylinder mechanism of the electric brake actuator. 3. The vehicle body attachment structure, for said electric brake actuator, according to claim 2, wherein the driving force transmission section includes a housing provided with a motor attachment portion for attaching the electric motor to the driving force transmission section,and wherein the mount portion is provided in the housing. 4. The vehicle body attachment structure, for said electric brake actuator, according to claim 1, wherein the electric motor is disposed lower than the cylinder mechanism,and wherein the mount portion is disposed at an upper portion of the electric brake actuator. 5. The vehicle body attachment structure, for an electric brake actuator, according to claim 1, comprising: a load transmission section that is formed between the electric brake actuator and the vehicle body to transmit a load from the electric brake actuator to the vehicle body,wherein the load transmission section is provided independently from the mount portion. 6. The vehicle body attachment structure, for said electric brake actuator, according to claim 1, comprising: an electric-brake-actuator fixing bracket for fixing said electric brake actuator provided with a cylinder for generating said hydraulic brake pressure, based on said electric signal according to the braking operation,wherein the electric-brake-actuator fixing bracket includes:a penetration portion through which the electric brake actuator penetrates along an axial direction of the cylinder, wherein the penetration portion restricts displacement of a portion, of the electric brake actuator, having passed through;a support portion for supporting a substantially central portion of the electric brake actuator in a state of penetrating through along the axial direction of the cylinder mechanism; anda fixing portion to be fixed by being attached to the vehicle body. 7. A vehicle body attachment structure for an electric brake actuator for a vehicle brake system including an input device to which braking operation by an operator is input and an electric brake actuator for generating a hydraulic brake pressure, based on at least an electric signal according to the braking operation, wherein the electric brake actuator includes:an electric motor that drives, based on the electric signal;a driving force transmission section for transmitting a driving force of the electric motor; anda cylinder mechanism for applying a pressure to brake fluid by moving a piston along an axial direction by the driving force transmitted from the driving force transmission section,wherein a mount portion for attaching the electric brake actuator to a vehicle body is provided in a vicinity of a center of gravity of the electric brake actuator;wherein the driving force transmission section includes an actuator housing provided with a motor attachment portion for attaching the electric motor to the driving force transmission section,and wherein a connector is disposed on a side surface side of the actuator housing and is electrically connected with the electric motor,wherein the electric brake actuator is attached to a side member extending along a front/rear direction on a left side and a right side of the vehicle. 8. The vehicle body attachment structure, for said electric brake actuator, according to claim 7, wherein the connector is provided such as to extend along a direction substantially perpendicular to an axial line of a motor shaft of the electric motor. 9. The vehicle body attachment structure, for said electric brake actuator, according to claim 7, wherein the cylinder mechanism is provided with a reservoir for reserving brake fluid,and wherein the reservoir is provided such that a direction in which brake fluid is introduced to the reservoir and a direction of attaching and detaching the connector agree with each other. 10. A vehicle body attachment structure for an electric brake actuator for a vehicle brake system including an input device to which braking operation by an operator is input and an electric brake actuator for generating a hydraulic brake pressure, based on at least an electric signal according to the braking operation, wherein the electric brake actuator includes:an electric motor that drives, based on the electric signal;a driving force transmission section for transmitting a driving force of the electric motor; anda cylinder mechanism for applying a pressure to brake fluid by moving a piston along an axial direction by the driving force transmitted from the driving force transmission section,and wherein a mount portion for attaching the electric brake actuator to a vehicle body is provided in a vicinity of a center of gravity of the electric brake actuator;wherein a pipe connected to the electric brake actuator, brake fluid flowing through the pipe, is connected to the cylinder mechanism,and wherein a portion of the pipe, the portion being located at a position away from a connection part of the pipe with the cylinder mechanism, is supported by an intermediate portion of the electric brake actuator,wherein the pipe extends along a direction perpendicular to the axial direction at the connection part with the cylinder mechanism such as to get away from a surface of the electric brake actuator, thereafter again gets close to the surface of the electric brake actuator, and is supported at a thus close portion thereof by the electric brake actuator. 11. A vehicle body attachment structure for an electric brake actuator for a vehicle brake system including an input device to which braking operation by an operator is input and an electric brake actuator for generating a hydraulic brake pressure, based on at least an electric signal according to the braking operation, wherein the electric brake actuator includes:an electric motor that drives, based on the electric signal;a driving force transmission section for transmitting a driving force of the electric motor; anda cylinder mechanism for applying a pressure to brake fluid by moving a piston along an axial direction by the driving force transmitted from the driving force transmission section,and wherein a mount portion for attaching the electric brake actuator to a vehicle body is provided in a vicinity of a center of gravity of the electric brake actuator,wherein a pipe connected to the electric brake actuator, brake fluid flowing through the pipe, is connected to the cylinder mechanism,wherein a portion of the pipe, the portion being located at a position away from a connection part of the pipe with the cylinder mechanism, is supported by an intermediate portion of the electric brake actuator,wherein the cylinder mechanism is provided with plural ports each of which communicating respectively with either a first hydraulic pressure chamber or a second hydraulic pressure chamber that are formed side by side along the axial direction inside the cylinder mechanism,and wherein the pipe is provided in a plural number, at least corresponding to the plural ports. 12. A vehicle body attachment structure; for an electric brake actuator for a vehicle brake system including an input device to which braking operation by an operator is input and an electric brake actuator for generating a hydraulic brake pressure, based on at least an electric signal according to the braking operation, wherein the electric brake actuator includes:an electric motor that drives, based on the electric signal;a driving force transmission section for transmitting a driving force of the electric motor; anda cylinder mechanism for applying a pressure to brake fluid by moving a piston along an axial direction by the driving force transmitted from the driving force transmission section,and wherein a first mount portion for attaching the electric brake actuator to a vehicle body is provided in a vicinity of a center of gravity of the electric brake actuator, said first mount portion supporting the electric brake actuator on the vehicle body; anda second mount portion that is different from the first mount portion and supports a tip end side of the cylinder mechanism on the vehicle body; whereinthe first mount portion is provided in the vicinity of the center of gravity of the electric brake actuator,wherein the cylinder mechanism is provided in advance with plural unprocessed bosses,wherein one of the bosses is formed for the second mount portion for attaching the electric brake actuator to the vehicle body,and wherein the rest of the bosses are formed for a port or ports communicating with the cylinder mechanism. 13. The vehicle body attachment structure, for an electric brake actuator, according to claim 12, wherein the second mount portion is provided at the tip end of the cylinder mechanism,and wherein the electric brake actuator is supported by two points in the vicinity of the center of gravity and at the tip end.