Brake disc with sliding caliper with air bleed between the receivers and vents

Abstract

The invention relates to a motor vehicle disc brake comprising a cover (12), comprising two bores, a sliding caliper, two pins (16) for guiding the caliper, each of which comprises a guide portion (24) slidably mounted in a portion (28) of a bore, wherein each pin (16) engages with the wall of the bore (29) forming an axial channel (65) and each pin (16) receives a tubular sealing cap in which an inner wall comprises at least one radial groove or a radial channel formed by the axial channel (65). It is connected by the corresponding pin.

Description

Sliding gas-caliper disc brake with air bleed between pins and holes Technical field of the invention The invention relates to a motor vehicle disc brake. Technical background of the invention The present invention relates particularly to a motor vehicle disc brake comprising: - a cover comprising two holes aligned on parallel axes, each of which comprises at least one first section, - a caliper slidably mounted perpendicular to the cover, - Two pins with parallel axes, each of which includes an axial connecting end connected to the caliper and at least one guide portion for axial sliding of the caliper relative to the cover extending from a free end of the corresponding pin and slidably mounted in a first portion of the associated aligned hole of the cover. In this design, the guide portion of each pin is slidably mounted in a first portion of the corresponding hole which is blinded or closed, for the purposes of strength and protection of this sliding guide area, and a certain amount of air is thus retained between the free end of the pin guide portion and the base of the first portion of the corresponding hole. During axial insertion of the pin into the corresponding hole in the coupling and assembly line, or during the so-called "non-braking" phase when the disc pushes the brake plate and caliper back, this volume is reduced by the forward movement of the free end of the pin guide section towards the base of the first hole section. Until the amount of air held is prevented or prevented from moving forward, it is necessary to provide means capable of progressively assessing the air held. The prior art in particular involves a series of solutions that require modifications that are complex to perform, since the hole is aligned, which in turn affects the sliding guide capabilities of the corresponding pin. Extraction Summary To compensate for these defects, and to solve the problem of air evaluation, the invention proposes a motor vehicle disc brake comprising: - a cover comprising two holes aligned on parallel axes, each of which comprises at least one first section, - a caliper slidably mounted axially relative to the cover, - Two parallel axis pins, each of which includes: - one axial connection end connected to the caliper, and - at least one guide portion for axial sliding of the caliper relative to the housing extending from a free end of the corresponding pin facing a base of the corresponding first portion, said guide portion slidably mounted in the corresponding first aligned hole portion of the housing. It is specified that - Each pin engaged with the wall of the hole forms at least one axial channel extending from the free end of said pin, - the corresponding lined hole of the cover includes, on the end side, a second part for connecting the pin to the caliper, Each pin accommodates a tubular sealing cap in which one section is radially inserted between the corresponding pin and the corresponding second section and An inner wall of each tubular cap includes at least one radial groove or a radial channel communicating with at least one axial channel formed by the corresponding pin. Regarding other features of the invention: - the inner wall of each tubular cap comprises at least one annular radial groove which communicates with at least one said axial channel formed by the corresponding pin, The inner wall of each tubular cap comprises a number of annular radial grooves spaced regularly along the entire axial length of said cap, each of which is adapted to communicate with at least one said axial channel formed by the corresponding pin according to the axial position of the caliper relative to the fixed cover. - The inner wall of each tubular cap comprises at least one helical radial groove extending along the entire axial length of said cap and communicating with at least one axial channel formed by the corresponding pin, - Each pin comprises at least one flat portion extending from the free end of the pin over a length greater than the length of said guide portion and engaging the wall of the hole. It forms at least one axial channel extending from the free end of the pin and communicating with the space formed by said base, by the side wall of the hole and by an oblique surface of the free end of the pin. Summary of shapes Other features and advantages of the invention will become apparent upon reading the detailed description hereinafter, with reference to the accompanying drawings in which: Figure 1 is a top view, or partial section, of a caliper and a cover of a disc brake, particularly showing the engagement of each caliper pin in a lined hole of a cover of a disc brake according to the invention. Figure 2 is a side view on a larger scale of the two pins and two disc brake sealing caps on page 1, Figure 3 is a side view, partially cut away, showing the caliper and cover in Figure 1, Figure 4 is a detail view showing the inner axial bore of a sealing cap of a disc brake according to the invention, Figure 5 is a cross-sectional view through an oblique plane of a first portion of a pin inserted into a first portion of a disc brake bore according to the invention. Detailed description of shapes In the following description and claims, terms such as "longitudinal arrangement", "diagonal", etc. will be used in a non-limiting manner with reference to the two letters (L, T) shown in the figures and the definitions given in the description. In the following description, like reference numerals indicate like or equivalent parts or parts having similar functions. Figures 1 and 3 show a caliper 10 and a cover 12 of a motor vehicle disc brake (not shown) illustrated according to the prior art. In a known embodiment, the disc brake comprises a fixed cover 12 comprising two aligned holes 29, 31 parallel to axes A, B, each of which comprises at least one first blind section 28, 30. The brake also includes a caliper 10 which is axially slidably mounted along a longitudinal direction parallel to axes A and B relative to the fixed housing 12. The caliper 10 is slidably mounted relative to the housing 12 by two parallel pins 16, 18 of axes A, B, each of which includes a first axial end 20, 22 connected to the caliper 10 and including at least one blind or sealed portion 24, 26 for guiding axial sliding of the caliper 10 relative to the housing 12, which is slidably mounted with a radial clearance, in a first portion 28, 30 of a corresponding aligned bore 29, 31 of the housing 12. The guide surface of the outer cylindrical sections 24, 26 for guiding each pin 16, 18 herein includes, by way of non-limiting example and as can be seen in FIG. 5, four axial sections 64, which are diagonally opposed in pairs and each of which extends annularly around the axis A, B of each pin 16, 18. Each respective aligned hole 29, 31 of the cover 12 includes, at the end side 20, 22 for connecting the pin 16, 18 to the caliper 10, a so-called second "entry" portion 46, 48, and each pin 16, 18 accommodates a tubular cap 32, 34 made of elastomeric material, an axial portion of which is radially inserted between the respective pin 16, 18 and the second entry portion 46, 48. The caps 32, 34 ensure the tightness of the aligned holes 29, 31 against dust. Each cap 32, 34 includes ends 36, 38 that are coupled to a ring 40, 41 of ends 20, 22 for engaging each pin 16, 18 and includes a counter portion 42, 44 that is radially inserted between each pin 16, 18 and a second entry portion 46, 48 of a corresponding aligned hole 29, 31 of cover 12. To enable the air contained in the aligned holes 29 and 30 to be opened, the covers 32, 34 are associated with the first portions (66) mentioned above by providing at least one channel 65 allowing air to flow outward for each pin. For this purpose, an inner bore wall 70 of each tubular cap 32, 34 includes at least one inner radial groove 72. In this example, the inner radial groove 72 is "interrupted" by at least one axial channel 65 formed by a flat portion 66 of the pin in question and by the bore wall 29, 31. The fluid communication between the axial channel 65 and the groove 72 is continuous, thereby ensuring the circulation and progressive discharge of the air contained in the space formed at the blind front end of the bore 29, 31 (where the channel 65 opens) to the outside environment, i.e. to the hexagonal end portions. According to a first embodiment of the caps 32, 34 according to the invention, shown in Figure 4, the inner wall 70 of each tubular cap 32, 34 comprises a number of annular radial grooves 72 which are regularly spaced along the entire length of the cap 32. Alternatively, according to a second embodiment (not shown), the inner wall 70 of the cap 32, 34 comprises a single helical groove of a defined slope which extends along the entire axial length of the cap 32, 34 and which therefore "intersects with said axial channels at a number of points". In the example of the pins described above, each pin is formed, in a non-limiting manner, with four axial channels 65, each of which is continuously in communication with at least one radial groove 72 for venting air to the "outside". The non-axial arrangement of the grooves also allows for non-compensation of other actions such as guidance for sliding. The invention is not limited to the basic design described above. According to a conventional "mechanical turning" in the field, the pins can be connected to the caliper and the corresponding holes can be formed into a cap. Likewise, the invention is not limited to the proposed design of one or more axial channels 65 obtained using one or more flat sections 66. Alternatively, at least one channel connecting the blind end of the hole with an associated groove or channel of the cap can be shown in any suitable form.

Claims

CLAIMS 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), characterised in that: - 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, characterised in that 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, characterised in that 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. Disc brake according to claim 1, characterised in that the inner wall (70) of each tubular cap (32) includes at least one helicoidal radial groove extending along an entire axial length 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, characterised in that 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). ABSTRACT SLIDING CALIPER DISC BRAKE HAVING EVACUATION OF AIR BETWEEN PINS AND BORES The invention relates to 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 characterised in that 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. Figure 5.

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