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In a brake system for a motorcycle in which the operation of a pressure-regulating unit interposed between fluid pressure-generating unit and a wheel brake so as to regulate an output fluid pressure of the fluid pressure-generating unit and to apply the regulated fluid pressure to the wheel brake is

In a brake system for a motorcycle in which the operation of a pressure-regulating unit interposed between fluid pressure-generating unit and a wheel brake so as to regulate an output fluid pressure of the fluid pressure-generating unit and to apply the regulated fluid pressure to the wheel brake is controlled by a control unit on the basis of a value detected by operating amount detector for detecting an operating amount of a brake operating element, to arrange the fluid pressure-generating unit in a location which is close to the pressure control unit disposed on the rear side of an engine body and in which an installation space is easy to secure. The fluid pressure-generating unit, laid out in plan view between a left-right pair of seat rails which constitute a part of a body frame and which support a riders' seat, is supported by the seat rails.

대표청구항 ▼

1. A motorcycle comprising: a body frame comprising left and right seat rails which are spaced apart from one another and provided to support a seat thereon;an engine mounted on said body frame, said engine comprising an engine body;a wheel brake;a manually operable brake operating element which is

1. A motorcycle comprising: a body frame comprising left and right seat rails which are spaced apart from one another and provided to support a seat thereon;an engine mounted on said body frame, said engine comprising an engine body;a wheel brake;a manually operable brake operating element which is fluidly connected to said wheel brake; anda brake-by wire system comprising: an operation amount detector for detecting an amount of force applied to the brake operating element;a fluid pressure-generating unit capable of generating a fluid pressure independently from an operation of said brake operating element,a pressure-regulating unit interposed between said fluid pressure-generating unit and a wheel brake for regulating an output fluid pressure of said fluid pressure-generating unit and applying the regulated fluid pressure to said wheel brake, anda control unit for controlling the operation of said pressure-regulating unit on the basis of a signal from said operating amount detector, said pressure-regulating unit being disposed on the rear side of said engine body,wherein as seen in a top plan view thereof, said fluid pressure-generating unit is disposed between and supported by said left and right seat rails. 2. The motorcycle as set forth in claim 1, wherein said fluid pressure-generating unit is flexibly supported, through a flexibly resilient member, by a first support member which is attached to one of said seat rails, and by a crossmember which connects both said seat rails to each other. 3. The motorcycle as set forth in claim 2, wherein a second support member is firmly attached to said crossmember, and an attaching member, fixed to said fluid pressure-generating unit, is supported by said second support member through a flexibly resilient member. 4. The motorcycle as set forth in claim 3, further comprising: a swing arm which is pivotally attached to said body frame and is supported for reciprocal movement thereon;a rear wheel which is rotatably attached to said swing arm;a link mechanism provided between said swing arm and said body frame, said link mechanism comprising a link member;a shock absorber extending between said swing arm and said link member; anda sub-tank for conditioning a damping force of said shock absorber, said sub-tank disposed on the rear side of said fluid pressure-generating unit and supported by said seat rail. 5. The motorcycle as set forth in claim 2, further comprising: a swing arm which is pivotally attached to said body frame and is supported for reciprocal movement thereon;a rear wheel which is rotatably attached to said swing arm;a link mechanism provided between said swing arm and said body frame, said link mechanism comprising a link member;a shock absorber extending between said swing arm and said link member; anda sub-tank for conditioning a damping force of said shock absorber, said sub-tank disposed on the rear side of said fluid pressure-generating unit and supported by said seat rail. 6. The motorcycle as set forth in claim 1, further comprising: a swing arm which is pivotally attached to said body frame and is supported for reciprocal movement thereon;a rear wheel which is rotatably attached to said swing arm;a link mechanism provided between said swing arm and said body frame, said link mechanism comprising a link member;a shock absorber extending between said swing arm and said link member; anda sub-tank for conditioning a damping force of said shock absorber, said sub-tank disposed on the rear side of said fluid pressure-generating unit and supported by said seat rail. 7. The motorcycle as set forth in claim 6, wherein a sub-tank support member for supporting said sub-tank is fixed to said seat rail by co-fastening together with a pillion step. 8. A motorcycle comprising: a body frame comprising left and right seat rails which are spaced apart from one another and provided to support a seat thereon;an engine mounted on said body frame, said engine comprising an engine body;a wheel brake;a manually operable brake operating element which is fluidly connected to said wheel brake; anda brake-by wire system comprising: an operation amount detector for detecting an amount of force applied to the brake operating element;a fluid pressure-generating unit capable of generating a fluid pressure independently from an operation of said brake operating element,a pressure-regulating unit interposed between said fluid pressure-generating unit and a wheel brake for regulating an output fluid pressure of said fluid pressure-generating unit and applying the regulated fluid pressure to said wheel brake, anda control unit for controlling the operation of said pressure-regulating unit on the basis of a signal from said operating amount detector, said pressure-regulating unit being disposed on the rear side of said engine body,wherein as seen in a top plan view thereof, said fluid pressure-generating unit is disposed between and supported by said left and right seat rails;wherein said fluid pressure-generating unit is flexibly supported, through a flexibly resilient member, by a first support member which is attached to one of said seat rails, and by a crossmember which extends between and connects both said seat rails;and wherein a second support member is firmly attached to said crossmember, and an attaching member, fixed to said fluid pressure-generating unit, is supported by said second support member through a flexibly resilient member. 9. The motorcycle as set forth in claim 8, further comprising: a swing arm which is pivotally attached to said body frame and is supported for reciprocal movement thereon;a rear wheel which is rotatably attached to said swing arm;a link mechanism provided between said swing arm and said body frame, said link mechanism comprising a link member;a shock absorber extending between said swing arm and said link member; anda sub-tank for conditioning a damping force of said shock absorber, said sub-tank disposed on the rear side of said fluid pressure-generating unit and supported by said seat rail. 10. The motorcycle as set forth in claim 9, wherein a sub-tank support member for supporting said sub-tank is fixed to said seat rail by co-fastening together with a pillion step. 11. A motorcycle comprising: a body frame comprising left and right seat rails which are spaced apart from one another and provided to support a seat thereon;an engine mounted on said body frame, said engine comprising an engine body;a wheel brake;a manually operable brake operating element which is fluidly connected to said wheel brake; a swing arm which is pivotally attached to said body frame and is supported for reciprocal movement thereon;a rear wheel which is rotatably attached to said swing arm;a link mechanism provided between said swing arm and said body frame, said link mechanism comprising a link member;a shock absorber extending between said swing arm and said link member; anda sub-tank for conditioning a damping force of said shock absorber, said sub-tank disposed on the rear side of said fluid pressure-generating unit and supported by said seat rail; and a brake-by wire system comprising: an operation amount detector for detecting an amount of force applied to the brake operating element;a fluid pressure-generating unit capable of generating a fluid pressure independently from an operation of said brake operating element,a pressure-regulating unit interposed between said fluid pressure-generating unit and a wheel brake for regulating an output fluid pressure of said fluid pressure-generating unit and applying the regulated fluid pressure to said wheel brake, anda control unit for controlling the operation of said pressure-regulating unit on the basis of a signal from said operating amount detector, said pressure-regulating unit being disposed on the rear side of said engine body,wherein as seen in a top plan view thereof, said fluid pressure-generating unit is disposed between and supported by said left and right seat rails. 12. The motorcycle as set forth in claim 11, wherein said fluid pressure-generating unit is flexibly supported, through a flexibly resilient member, by a first support member which is attached to one of said seat rails, and by a crossmember which connects both said seat rails to each other. 13. The motorcycle as set forth in claim 12, wherein a second support member is firmly attached to said crossmember, and an attaching member, fixed to said fluid pressure-generating unit, is supported by said second support member through a flexibly resilient member. 14. The motorcycle as set forth in claim 11, wherein a sub-tank support member for supporting said sub-tank is fixed to said seat rail by co-fastening together with a pillion step.