# US 9,038,788 B2 · Disc brake having a latch for locking the conversion cartridge by means of a latch

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- Number: US 9,038,788 B2
- Document ID: US9038788B2
- Status: Granted
- Kind: B2
- Application number: 13/880,935
- Filed: 2011-09-21
- Published: 2013-08-15
- Granted: 2015-05-26
- Earliest claimed: 2010-10-22
- Assignees: Chassis Brakes International B.V.
- Applicants: Jan Vinck; Fabien Chaigneau
- Inventors: Jan Vinck; Fabien Chaigneau
- Web page: https://patentgrep.com/patent/US9038788B2

## CPC

- F16D 55/22: by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads
- F16D 65/183: {with force-transmitting members arranged side by side acting on a spot type force-applying member}
- F16D 2121/02: Fluid pressure
- F16D 2121/04: acting on a piston-type actuator, e.g. for liquid pressure
- F16D 2121/14: Mechanical
- F16D 2123/00: Multiple operation forces
- F16D 2125/36: Helical cams, Ball-rotating ramps
- F16D 2127/06: Locking mechanisms, e.g. acting on actuators, on release mechanisms or on force transmission mechanisms
- F16D 2131/00: Overall arrangement of the actuators or their elements, e.g. modular construction
- F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES

## Abstract

A disc brake comprising a floating stirrup and a brake piston controlled via a motion conversion cartridge (200) comprising a rear part pressed against the bottom of the stirrup and a control shaft passing through the bottom. The front part of the cartridge is pressed against the brake piston. It comprises a piston (240) provided with a plate (242) cooperating with the plate (212) of the control shaft (210) with the interposition of balls cooperating with tracks in the form of ramps for transforming the relative rotational motion of the plate (212) relative to the other (242) into a translational motion of the piston (240). The cartridge (200) is held in place in its housing (113) by a cage (260) attached elastically to the wall of the housing. The plate of the piston (240) comprises longitudinal grooves (243) receiving the branches (233) of a lock (230) which is elsewhere blocked in rotation in the housing of the stirrup while leaving the conversion piston (240) free in translation.

## Claims

### Claim 1

A disc brake comprising a floating stirrup (100) straddling the brake disc (2) bearing a fixed shoe (3) and forming a cylinder (110) housing a piston (5) bearing a mobile shoe (4) for clamping the brake disc,
the piston (5) being controlled by an hydraulic circuit and by a parking brake system via a motion conversion cartridge (200) transforming a pivoting motion of a pivoting lever (120) linked to a parking brake, borne by the stirrup (100), into a translational motion for pushing the brake piston (5),
the cylinder (110) having a front part housing the brake piston (5) and a rear part forming a housing (113) and receiving the conversion cartridge (200),
the cartridge (200) passing, in a seal-tight manner, through an axial orifice (115) in a bottom (114) of the housing (113) of the cylinder (110) to link a control shaft (210) to the pivoting lever (120) of the parking brake,
characterized in that
A) the conversion cartridge (200) comprises:
a rear part pressed against the bottom (114) of the housing (113) of the cylinder (110) and consisting of:
a rotation-blocking lock (230) in the form of a ring (231) pressed around the axial orifice (115) of the bottom (114) of the housing (113), and bearing at least one locking branch (233), that extends forward parallel to the axis, and a control shaft (210) linked to the pivoting lever (120) of the parking brake, the control shaft (210) including a sleeve (211) passing through the ring (231), and a first plate (212) coming in front of the ring (231) in the perimeter defined by the locking branch (233) of the lock, a front face of the first plate (212) comprising ramps,
a front part pressed against the brake piston (5), mobile in translation relative to the cylinder (110) but blocked in rotation, and consisting of:
a conversion piston (240) including a second plate (242) intended to cooperate with the first plate (212) of the control shaft (210) with the interposition of mobile balls in ramps of the first and second plates (212, 242) to transform the relative rotational motion of the first and second plates (212, 242) into a translational motion of the conversion piston (240) to act on the brake piston (5), and
the edge of the second plate (242) comprises at least one rotation-locking axial groove (243) for receiving the corresponding locking branch (233) of the lock (230),
a cage (260) for retaining the conversion piston (240) in the cylinder (110) via a clip (201) and a return spring (250) interposed between the cage and the conversion piston (240), acting against the translational motion generated by the plates (212, 242) and the balls,
B) the rear part of the cylinder (110) that forms the housing (113) and receives the conversion cartridge (200) includes at least one longitudinal groove (119) that receives the locking branch (233) of the lock (230), wherein the locking branch (233) also engages the at least one rotation-locking axial groove (243) of the second plate (242).

### Claim 2 (depends on 1)

The disc brake according to claim 1, characterized in that
the housing (113) of the cartridge (200) in the stirrup (100) and the plate (242) of the conversion piston (240) each comprise three longitudinal grooves (119, 243) and
the lock (230) is provided with three longitudinal locking branches (233),
the grooves (119, 243) being distributed equi-angularly and facing one another and the locking branches (233) being in positions matching those of the grooves (119, 243) , such that each of the locking branches (233) is housed both in a respective one of the three longitudinal grooves (119) of the housing (113) and a respective one of the three longitudinal grooves (243) of the plate (241) of the piston (240).

### Claim 3 (depends on 1)

The disc brake according to claim 1, characterized in that the ring (231) bears three longitudinal locking branches (233), parallel to the axis, and the sleeve (211) extends beyond the ring (231) on the side opposite that bearing the locking branches (233), the sleeve (211) being intended to pass partially through the bottom of the housing (113) of the cylinder (110), the ring (231) pressed around the axial orifice (115) of the bottom of the housing (113) constituting a bearing for the plate (212) of the control shaft (210).

### Claim 4 (depends on 1)

The disc brake according to claim 1, characterized in that the groove (119) of the housing (113) has an arc-of-circle section and the locking branch (233) of the lock has a rectangular section with one side in the form of an arc-of-circle with a radius substantially equal to that of the groove into which the locking branch (233) penetrates at least over a part of its section (119).

### Claim 5 (depends on 1)

The disc brake according to claim 1, characterized in that the at least one rotational-locking axial groove (243) has a rectangular section.

### Claim 6 (depends on 1)

The disc brake according to claim 1, characterized in that the cage (260) includes a flange (263) and the housing (113) of the cartridge (200) comprises a shoulder (117) to receive, bearing against it, the flange (263) of the cage (260) and a peripheral groove (118) to receive the clip (201).

### Claim 7 (depends on 1)

The disc brake according to claim 1, characterized in that the cage (260) is a part made of elastic steel of overall tapered form having a bottom (261) in the form of a ring bearing blades (262) linked to a slotted flange (263) and intermediate blades (264), with free ends, receiving the clip (201).

### Claim 8 (depends on 2)

The disc brake according to claim 2, characterized in that the ring (231) bears three longitudinal locking branches (233), parallel to the axis, and the sleeve (211) extends beyond the ring (231) on the side opposite that bearing the locking branches (233), the sleeve (211) being intended to pass partially through the bottom of the housing (113) of the cylinder (110), the ring (231) pressed around the axial orifice (115) of the bottom of the housing (113) constituting a bearing for the plate (212) of the control shaft (210).

### Claim 9 (depends on 1)

The disc brake according to claim 1, characterized in that the locking branch (233) has a first length extending parallel to the axis of the disc brake and the ring (231) has a second length extending parallel to the axis, wherein the first length is greater than the second length.

### Claim 10 (depends on 9)

The disc brake according to claim 9, characterized in that the first length is more than twice the second length.