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CN-122003553-A - Disk brake, in particular for a motor vehicle

CN122003553ACN 122003553 ACN122003553 ACN 122003553ACN-122003553-A

Abstract

The invention relates to a disc brake (F) comprising a caliper (E) having a fixed brake pad (P1) and a brake pad (P2) opposite each other, said brake pad (P2) being movable with respect to the caliper (E), and comprising a mechanism for actuating the movable brake pad (P2) comprising a screw/nut system and means for transmitting the rotational movement of a drive pinion (5) to the screw/nut system for actuating the movable brake pad (P2). The invention is characterized in that the screw/nut system is mounted in a recess (L) made in the caliper (E), the screw (1) of the screw-nut mechanism is translationally lockingly mounted in the recess (L) and is rotatable by the transmission means, and the nut (2) is rotationally lockingly mounted in the recess (L), the translation along the screw (1) during rotation of the screw (1), the translation of the nut (2) in a first direction enables the movable brake pad (P2) to translate towards the fixed brake pad (P1), and the translation of the nut (2) in the opposite direction enables the movable brake pad (P2) to move away from the fixed brake pad (P1).

Inventors

  • Philip Bourlon

Assignees

  • 安斯泰莫法国有限公司

Dates

Publication Date
20260508
Application Date
20241011
Priority Date
20231013

Claims (16)

  1. 1. A disc brake (F) comprising a caliper (E) having fixed brake pads (P1) and brake pads (P2) opposite each other, said brake pads (P2) being movable with respect to said caliper (E), said disc brake (F) further comprising a mechanism for actuating a movable brake pad (P2), said mechanism comprising a screw/nut system and means for transmitting a rotational movement from a drive shaft (4) to said screw/nut system for actuating said movable brake pad (P2), said screw/nut system and said means being mounted coaxially with each other, Characterized in that the screw/nut system is mounted in a recess (L) formed in the caliper (E), that a screw (1) of the screw-nut mechanism is non-translatably mounted in the recess (L) and is rotatable by the transmission means, and that the nut (2) non-rotatably mounted in the recess (L) is translatable along the screw (1) during rotation of the screw (1), that translation of the nut (2) in a first direction enables translation of the movable brake pad (P2) towards the fixed brake pad (P1), and that translation of the nut (2) in an opposite direction enables movement of the movable brake pad (P2) away from the fixed brake pad (P1).
  2. 2. Disc brake (F) according to claim 1, characterized in that one (B2) of the arms (B1, B2) of the caliper (E) comprises the recess (L) in which the screw/nut system is mounted, the recess (L) being cylindrical, having a circular cross section, one end of which opens into the space (E1) between the arms (B1, B2) and the other end at least partly houses means for transmitting the rotation of the drive pinion (5) to the screw (1).
  3. 3. Disc brake (F) according to claim 1 or 2, characterized in that the recess (L) thus has at least one hole, the size of which is complementary to a nut (2) of the screw/nut system, which hole comprises fastening means complementary to fastening means provided on the nut, so that the nut (2) can be non-rotatably mounted in the recess (L) and translated.
  4. 4. A disc brake (F) according to any one of claims 1 to 3, characterized in that the fastening means comprise at least one axial rib extending on the outer wall of the nut (2) along the longitudinal axis of the nut (2), and a corresponding axial groove formed on the wall of the recess (L), into which the axial rib of the nut (2) can be inserted.
  5. 5. Disc brake (F) according to any of claims 1 to 4, characterized in that the means for transmitting the rotational movement of the drive pinion to the screw/nut system are also accommodated in the recess (L) and consist of a drive pinion (5) starting from the drive shaft (4), a stationary ring gear (6) and a movable ring gear (7) integral with the screw (1) of the screw/nut system.
  6. 6. A disc brake according to any one of claims 1 to 5, wherein the gear motor transmission is located entirely at the rear of the screw, i.e. on the opposite side of the brake pad to the screw thread.
  7. 7. Disc brake (F) according to any of claims 1 to 4, characterized in that the means for transmitting the rotational movement of the drive pinion to the screw/nut system are also accommodated in the recess (L) and consist of the drive pinion (5) starting from the drive shaft (4), a planet carrier (6) and a ring gear (7) which is integral with both the planet carrier (6) and the screw (1) of the screw/nut system.
  8. 8. Disc brake (F) according to any one of claims 5 to 7, characterized in that the toothing (7) is formed integrally with the screw (1) so as to be constituted by one end of the screw (1), the other end of the screw (1) being inserted into the nut (2).
  9. 9. Disc brake (F) according to any of claims 6 to 8, characterized in that the screw/nut system consists of a ball screw/nut system.
  10. 10. Disc brake (F) according to any one of claims 1 to 9, characterized in that the nut (2) is in the form of a cylindrical sleeve surrounding the screw (1) with threads on its inner wall, engages with the threads of the screw (1) and is locked against rotation in the recess, the nut (2) being translated under the effect of the rotation of the screw (1), the nut (2) being intended to be inserted into the space (E1) between the arms (B1, B2) of the caliper (E) with its ends against the brake pad (P2).
  11. 11. Disc brake (F) according to claim 10, characterized in that the nut (2) has a sealingly mounted cap (9) at its end.
  12. 12. Disc brake (F) according to claim 11, characterized in that a sealing bellows (10) is also fastened between the periphery of the recess (L) and the cover (9).
  13. 13. Disc brake (F) according to any one of claims 11 and 12, characterized in that the screw/nut system, the cover (9) and the sealing bellows (10) are assembled into a module which can be inserted into the recess (L) formed in the caliper (E).
  14. 14. Disc brake according to any of the preceding claims, characterized in that the movable ring gear (7) is axially supported on the stationary ring gear (6) by means of rolling bearings.
  15. 15. A motor vehicle equipped with a disc brake according to any one of claims 1 to 14.
  16. 16. Method for manufacturing a disc brake (F) according to any one of claims 1 to 14, comprising a caliper (E) with fixed brake pads (P1) and brake pads (P2) opposite each other, the brake pads (P2) being movable with respect to the caliper (E), the disc brake further comprising a mechanism for actuating the movable brake pads (P2), the mechanism comprising a screw/nut system and means for transmitting the rotational movement of a drive pinion (5) to the screw/nut system for actuating the movable brake pads (P2), characterized in that a through hole is made in one of the arms of the caliper (E) to form a recess (L) opening into the space (E1) between the arms (B1, B2) and the screw/nut system is mounted in the recess (L), one end of the screw (1) being coupled to the means for transmitting the rotational movement of a drive pinion (5) connected to a motor (M), while the end of the screw (1) is coupled to the movable brake pad (P2).

Description

Disk brake, in particular for a motor vehicle The present invention relates to a disc brake, in particular for motor vehicles, comprising a caliper able to span a sector of a brake disc integral with the wheel of the vehicle, positioning a brake pad on each side of the disc, and having means for controlling the clamping of the brake pad on the disc. Such disc brakes comprise a caliper having a fixed brake pad and a brake pad movable relative to the caliper, opposite each other, and a mechanism for actuating the movable brake pad comprising a screw/nut system and means for transmitting rotational movement from the drive shaft to the screw/nut system for actuating the movable brake pad. Background In a disc brake, the caliper is constrained to rotate with the vehicle, for example with a stub shaft forming the wheel hub. The caliper typically comprises two arms connected by an arch and spans a sector of a brake disc integral with the wheel, one arm on each side of the disc. The caliper uses a pair of friction pads (i.e., brake pads), one on each side of the disc, to clamp the brake disc between its arms. In braking, these brake pads are clamped against the brake disc by the action of one or more brake pistons, which are actuated by hydraulic pressure when used as service brakes and which are driven by electromechanical means when used as parking brakes. This clamping creates friction between the brake pads and the brake disc, dissipating the kinetic energy of the vehicle in the form of heat, thereby generating braking power. The service braking function includes decelerating the running vehicle and stopping it completely if necessary. In addition to service braking, such disc brakes may also be used to perform emergency braking and/or parking braking functions. In the case of a disc brake having an electromechanical device for actuating the brake, the electromechanical device comprises, on the one hand, a screw-nut assembly and, on the other hand, an electric gearmotor assembly for bi-directionally rotating a nut of the screw-nut assembly. Such a disc brake is described, for example, in FR-a-3 116 576. The caliper in this document has two arms, one with a fixed brake pad and the other with a movable brake pad, which are arranged opposite each other, the movable brake pad being displaced towards the fixed part by means of an electromechanical actuator having a ball screw/nut system and an interface for controlling the rotation of the motor. The nut is non-translatably mounted in a recess on the arm of the caliper, the nut being rotated by a rotation control interface of the motor, thereby producing a translatable displacement of the screw, one end of which is coupled to the movable brake pad. Thus, rotation of the nut in one direction translates a threaded rod extending from an arm of the caliper, thereby translating the movable brake pad toward the fixed brake pad to control the clamping of the brake disc, and rotation of the nut in the opposite direction translates the threaded rod in the opposite direction, thereby moving the movable brake pad away to control the release. However, the brake of the above type is not only complex in construction but also relatively bulky, especially at the interface between the drive shaft and the nut. The object of the invention is therefore to create a disk brake of this type which is simpler in construction and therefore occupies less space. The invention relates to a disc brake comprising a caliper having a fixed brake pad and a movable brake pad opposite each other, and a mechanism for actuating the movable brake pad, the mechanism comprising a screw/nut system and means for transmitting rotational movement from a drive pinion to the screw/nut system for actuating the movable brake pad, characterized in that the screw/nut system is mounted in a recess made in the caliper, that the screw of the screw-nut mechanism is non-translatably mounted in the recess and rotatable by a transmission, and that the nut is non-rotatably mounted in the recess, translating along the screw upon rotation of the screw, translating along a first direction of the nut enabling translation of the movable brake pad towards the fixed brake pad, and translating along an opposite direction of the nut enabling movement of the movable brake pad away from the fixed brake pad. Thus, advantageously, the rotation of the non-translatable screw, under the driving action of the driving pinion, results in a translational displacement of the non-rotatable nut. Since the screw is the element in the screw-nut mechanism driven by the drive pinion, the means required to transfer the rotation of the drive pinion to the screw is less and less bulky than the means required to transfer the rotation of the drive pinion to the nut. Thus, the structure of the brake according to the invention is simpler, more compact and therefore less costly. The brake comprises a caliper having two arms defining a gap therebetween, such t