Sliding caliper disc brake having evacuation of air between pins and bores
A motor vehicle disc brake including a cover ( 12 ) including two bores, a sliding caliper, two pins ( 16 ) for guiding the caliper, each whereof includes a guiding section ( 24 ) which is slidably mounted in a section ( 28 ) of a bore wherein each pin ( 16 ), engaging with the wall of the bore ( 29 ), defines an axial channel ( 65 ), and each pin ( 16 ) receives a tubular sealing cap wherein an inner wall includes at least one radial groove or a radial channel communicating with the axial channel ( 65 ) defined by the associated pin.
1. Motor vehicle disc brake including:
a cover ( 12 ) including two tiered bores of parallel axes, each whereof includes at least one first section ( 28 , 30 );
a caliper ( 10 ) slidably mounted axially with respect to the cover ( 12 );
two pins ( 16 , 18 ) of parallel axes (A, B), each whereof includes:
an axial attachment end ( 20 , 22 ) attached to the caliper ( 10 ); and
at least one guiding section ( 24 , 26 ) for axial sliding of the caliper ( 10 ) with respect to the cover ( 12 ) which extends from a free end ( 25 , 27 ) of the associated pin ( 16 , 18 ) which is facing a base ( 33 , 35 ) of said first section ( 28 , 30 ), said guiding section being slidably mounted in the first section ( 28 , 30 ) of the associated tiered bore ( 29 , 31 ) of the cover ( 12 ),
wherein:
each pin ( 16 , 18 ), engaging with the wall of the bore ( 29 , 31 ), defines at least one axial channel ( 65 ) extending from said free end ( 25 , 27 ) of the pin,
the associated tiered bore ( 29 , 31 ) of the cover ( 12 ) includes, on the side of the end ( 20 , 22 ) for attaching the pin ( 16 , 18 ) to the caliper, a second section ( 46 , 48 ),
each pin ( 16 , 18 ) receives a tubular sealing cap ( 32 , 34 ) wherein one section ( 42 , 44 ) is inserted radially between the associated pin ( 16 , 18 ), and said second section ( 46 , 48 ) and
an inner wall ( 70 ) of each tubular cap ( 32 , 34 ) includes at least one radial groove or a radial channel ( 72 ) communicating with said at least one axial channel ( 65 ) defined by the associated pin.
2. Disc brake according to claim 1 , wherein the inner wall ( 70 ) of each tubular cap ( 32 , 34 ) includes at least one annular radial groove ( 72 ) communicating with said at least one axial channel ( 65 ) defined by the associated pin.
3. Disc brake according to claim 2 , wherein the inner wall ( 70 ) of each tubular cap ( 32 , 34 ) includes a plurality of annular radial grooves ( 72 ) which are regularly spaced apart along an entire axial length of said cap ( 32 ) and each whereof is suitable for communicating with said at least one axial channel ( 65 ) defined by the associated pin, according to the axial position of the caliper with respect to the fixed cover.
4. Motor vehicle disc brake including:
a cover ( 12 ) including two tiered bores of parallel axes, each whereof includes at least one first section ( 28 , 30 );
a caliper ( 10 ) slidably mounted axially with respect to the cover ( 12 );
two pins ( 16 , 18 ) of parallel axes (A, B), each whereof includes:
an axial attachment end ( 20 , 22 ) attached to the caliper ( 10 ); and
at least one guiding section ( 24 , 26 ) for axial sliding of the caliper ( 10 ) with respect to the cover ( 12 ) which extends from a free end ( 25 , 27 ) of the associated pin ( 16 , 18 ) which is facing a base ( 33 , 35 ) of said first section ( 28 , 30 ), said guiding section being slidably mounted in the first section ( 28 , 30 ) of the associated tiered bore ( 29 , 31 ) of the cover ( 12 ),
wherein:
each pin ( 16 , 18 ), engaging with the wall of the bore ( 29 , 31 ), defines at least one axial channel ( 65 ) extending from said free end ( 25 , 27 ) of the pin,
the associated tiered bore ( 29 , 31 ) of the cover ( 12 ) includes, on the side of the end ( 20 , 22 ) for attaching the pin ( 16 , 18 ) to the caliper, a second section ( 46 , 48 ),
each pin ( 16 , 18 ) receives a tubular sealing cap ( 32 , 34 ) wherein one section ( 42 , 44 ) is inserted radially between the associated pin ( 16 , 18 ), and said second section ( 46 , 48 ),
an inner wall ( 70 ) of each tubular cap ( 32 , 34 ) includes at least one radial groove or a radial channel ( 72 ) communicating with said at least one axial channel ( 65 ) defined by the associated pin, and
at least one helicoidal radial groove extending along an entire axial length of the inner wall ( 70 ) of said cap ( 32 ) and communicating with said at least one axial channel ( 65 ) defined by the associated pin.
5. Disc brake according to claim 1 , wherein each pin ( 16 , 18 ) includes at least one flat section ( 66 ) extending from the free end ( 25 , 27 ) of the pin along a length greater than that of said guiding section 24 , 26 and which, engaging with the wall of the bore ( 29 , 31 ), defines at least one axial channel ( 65 ) extending from the free end ( 25 , 27 ) of the pin and communicating with the space defined by said base ( 33 , 35 ), by the lateral wall of the bore and by a transverse face of the free end ( 25 , 27 ) of the pin ( 16 , 18 ).