阅读说明：本技术 用于具有电动驻车制动器的盘式制动器组件的单向防旋转构件 (One-way anti-rotation member for disc brake assembly with electric parking brake ) 是由 M·巴博萨 于 2018-12-26 设计创作，主要内容包括：本发明涉及一种盘式制动器组件,该盘式制动器组件包括制动靴、从制动靴向外延伸的防旋转构件、支撑制动靴的能够移位的制动活塞、制动活塞的端面、以及端面中的凹陷区域。制动靴能够沿轴线移位。端面垂直于轴线并且面向制动靴。防旋转构件具有止挡表面和转向表面。凹陷区域与止挡表面接合以停止制动活塞沿第一方向的旋转,并且凹陷区域与转向表面接合以允许制动活塞沿第二方向旋转。第一方向和第二方向相反。(The present invention relates to a disc brake assembly comprising a brake shoe, an anti-rotation member extending outwardly from the brake shoe, a displaceable brake piston supporting the brake shoe, an end face of the brake piston, and a recessed region in the end face. The brake shoe is displaceable along the axis. The end face is perpendicular to the axis and faces the brake shoe. The anti-rotation member has a stop surface and a steering surface. The recessed region engages the stop surface to stop rotation of the brake piston in the first direction and the recessed region engages the steering surface to allow rotation of the brake piston in the second direction. The first direction is opposite to the second direction.)

1. A disc brake assembly comprising:

a brake shoe displaceable along an axis;

an anti-rotation member extending outwardly from the brake shoe and having a stop surface and a steering surface;

a displaceable brake piston supporting the brake shoe;

an end face of the brake piston perpendicular to the axis and facing the brake shoe; and

a recessed region in the end surface, wherein the recessed region engages the stop surface to stop rotation of the brake piston in a first direction, the recessed region engages the steering surface to allow rotation of the brake piston in a second direction, and the first and second directions are opposite.

2. The disc brake assembly of claim 1 wherein the steering surface deflects toward the brake shoe when the recessed region engages the steering surface.

3. The disc brake assembly of claim 2 wherein the spring force returns the steering surface away from the brake shoe when the recessed region disengages the steering surface.

4. The disc brake assembly of claim 2 wherein the stop surface deflects with the steering surface.

5. The disc brake assembly of claim 1 wherein the anti-rotation member deflects toward the brake shoe when the recessed region engages the steering surface.

6. The disc brake assembly of claim 1 wherein the anti-rotation member is connected to the brake shoe by a bent portion that biases the anti-rotation member away from the brake shoe.

7. The disc brake assembly of claim 1, further comprising:

a first distance from the brake shoe to the steering surface; and

a second distance from the brake shoe to the steering surface, the first and second distances being parallel to the axis, the first distance being greater than the second distance, and the first distance being between the stop surface and the second distance.

8. The disc brake assembly of claim 1 wherein the stop surface is a first plane parallel to the axis and the steering surface is a second plane transverse to the axis.

9. The disc brake assembly of claim 1 wherein the steering surface is a curved surface.

10. The disc brake assembly of claim 1 wherein the steering surface has a varying radius.

11. The disc brake assembly of claim 1 wherein the anti-rotation member extends from a backing plate of the brake shoe.

12. The disc brake assembly of claim 1 wherein the anti-rotation member extends from a pad of the brake shoe.

13. The disc brake assembly of claim 1 wherein the recessed region is recessed into the end face away from the brake shoe.

14. The disc brake assembly of claim 1 wherein rotation of the brake piston in the first direction positions the brake piston to support the brake shoe and rotation of the brake piston in the second direction displaces the brake piston away from the brake shoe.

15. The disc brake assembly of claim 1, further comprising:

a spindle nut displaceable along the axis to support the brake piston on the brake shoe;

a spindle to which the spindle nut is threadedly connected; and

a drive assembly that rotates the spindle to displace the spindle nut along the axis.

16. A disc brake assembly comprising:

a brake shoe displaceable along an axis;

an anti-rotation member extending outwardly from the brake shoe and having a stop surface and a steering surface;

a displaceable brake piston supporting the brake shoe;

an end face of the brake piston perpendicular to the axis and facing the brake shoe; and

a recessed region in the end face, wherein the recessed region engages the stop surface to stop rotation of the brake piston in a first direction, the recessed region engages the steering surface to allow rotation of the brake piston in a second direction, the first and second directions being opposite, and the anti-rotation member deflects toward the brake shoe when the recessed region engages the steering surface.

17. The disc brake assembly of claim 16 wherein the anti-rotation member is biased away from the brake shoe.

18. A disc brake assembly comprising:

a clamp having a cavity;

inboard and outboard brake shoes displaceable along an axis;

a brake lining mounted to the inboard and outboard brake shoes;

a brake piston mounted in the cavity for displacing the inboard and outboard brake shoes and supporting the inboard brake shoe;

an end face of the brake piston perpendicular to the axis and facing the inboard brake shoe;

a recessed region in the end face; and

an anti-rotation member extending outwardly from the inboard brake shoe and having a stop surface and a steering surface, wherein the recessed region engages the stop surface to stop rotation of the brake piston in a first direction, the recessed region engages the steering surface to allow rotation of the brake piston in a second direction, and the first and second directions are opposite.

19. The disc brake assembly of claim 18 wherein the steering surface deflects toward the inboard brake shoe when the recessed region engages the steering surface.

20. The disc brake assembly of claim 18, further comprising:

a spindle nut displaceable along the axis to support the brake piston on the inboard brake shoe;

a spindle to which the spindle nut is threadedly connected; and

a drive assembly that rotates the spindle to displace the spindle nut along the axis.

Background

The present invention relates generally to vehicle disc brake assemblies and, more particularly, to an improved anti-rotation member for use with the parking brake function of such disc brake assemblies.

A typical disc brake assembly for a vehicle includes a brake rotor secured to a wheel of the vehicle for rotation therewith and a non-rotating brake pad operable between an unbraked position and a braked position. Each of the brake pads is supported on a brake shoe. In the non-braking position, the brake pads do not slow down the rotation of the brake disc. In the braking position, the brake pads frictionally engage the rotor to slow rotation of the rotor. The brake pads are moved into frictional engagement with the brake disc by a brake piston and sliding caliper of the disc brake assembly. For example, hydraulic pressure may linearly actuate a brake piston to displace brake pads to frictionally engage a brake disk and provide braking. Typically, the brake piston directly displaces the inboard brake pads and displaces the outboard brake pads via the caliper.

The disc brake assembly may also provide a parking brake function by first moving the brake pads to a braking position and then supporting the brake piston using an Electric Parking Brake (EPB). The EPB may include a rotationally constrained spindle nut threaded onto a spindle driven by an electric motor. As the spindle is rotationally driven, the spindle nut is axially translated to support the brake piston on the brake pad in the braking position. An end face of the brake piston contacts one of the brake shoes to support the brake lining in the braking position.

When the end face contacts the brake shoe, torque from the motor is transmitted to the end face. The brake piston may rotate or swivel when the friction between the end faces and the brake shoes is insufficient to resist torque. The brake shoe typically has a backing plate on which the brake lining is supported and which is in contact with the end face. To stop the rotation of the brake piston, an anti-rotation member in the form of an outwardly projecting nose (pip) is provided on the backplate. When the nose engages a recessed region (e.g., a recess) provided in the end face, rotation of the brake piston is forcibly prevented. However, during manufacture of the disc brake assembly, the nose must be properly aligned with the recessed region. Otherwise, caliper drag, end face damage, brake pad damage, noise, premature brake pad wear, and/or tapered brake pad wear may result. This alignment requirement increases complexity and reduces the efficiency of manufacturing the disc brake assembly.

Further, to service the clamp, the motor is operated in reverse until the spindle contacts the spindle stop. When the spindle contacts the spindle stop, the brake piston will rotate because there is no friction between the end face and the brake shoe to stop the rotation. The rotating brake piston may strike a nose on the backing plate. Such impacts may damage the spindle. Accordingly, it would be desirable to have a disc brake assembly having an anti-rotation member that is more efficient to manufacture and that also reduces damage and/or wear.

Disclosure of Invention

The invention relates to an anti-rotation member for a disc brake assembly for a parking brake function.

According to one embodiment, the disc brake assembly may comprise one or more of the following features, alone and/or in combination: a brake shoe displaceable along an axis; an anti-rotation member extending outwardly from the brake shoe and having a stop surface and a deflection surface (diversion surface); a displaceable brake piston supporting the brake shoe; an end face of the brake piston perpendicular to the axis and facing the brake shoe; and a recessed region in the end face. The recessed region engages the stop surface to stop rotation of the brake piston in a first direction, and the recessed region engages the steering surface to allow rotation of the brake piston in a second direction. The first direction and the second direction are opposite.

According to this embodiment, the steering surface deflects towards the brake shoe when the recessed region engages the steering surface.

According to this embodiment, when the recessed region disengages from the steering surface, the spring force returns the steering surface away from the brake shoe.

According to this embodiment, the stop surface is deflected together with the turning surface.

According to this embodiment, the anti-rotation member deflects toward the brake shoe when the recessed region engages the steering surface.

According to this embodiment, the anti-rotation member is connected to the brake shoe by a bent portion that biases the anti-rotation member away from the brake shoe.

According to the present embodiment, the disc brake assembly may further include: a first distance from the brake shoe to the steering surface, and a second distance from the brake shoe to the steering surface. The first distance and the second distance are parallel to the axis. The first distance is greater than the second distance. The first distance is between the stop surface and the second distance.

According to this embodiment, the stop surface is a first plane parallel to the axis and the steering surface is a second plane transverse to the axis.

According to this embodiment, the diverting surface is a curved surface.

According to this embodiment, the turning surface has a varying radius.

According to this embodiment, the anti-rotation member extends from a backing plate of the brake shoe.

According to this embodiment, the anti-rotation member extends from a shim of the brake shoe.

According to this embodiment, the recessed region is recessed into the end face away from the brake shoe.

According to this embodiment, rotation of the brake piston in the first direction positions the brake piston to support the brake shoes, and rotation of the brake piston in the second direction displaces the brake piston away from the brake shoes.

According to the present embodiment, the disc brake assembly may further include: a spindle nut displaceable along the axis to support the brake piston on the brake shoe; a spindle to which the spindle nut is threadedly connected; and a drive assembly that rotates the spindle to displace the spindle nut along the axis.

According to another embodiment, the disc brake assembly may comprise one or more of the following features, alone and/or in combination: a brake shoe displaceable along an axis; an anti-rotation member extending outwardly from the brake shoe and having a stop surface and a steering surface; a displaceable brake piston supporting the brake shoe; an end face of the brake piston perpendicular to the axis and facing the brake shoe; and a recessed region in the end face. The recessed region engages the stop surface to stop rotation of the brake piston in a first direction, and the recessed region engages the steering surface to allow rotation of the brake piston in a second direction. The first direction and the second direction are opposite. The anti-rotation member deflects toward the brake shoe when the recessed region engages the steering surface.

According to this embodiment, the anti-rotation member is biased away from the brake shoe.

According to another embodiment, the disc brake assembly may comprise one or more of the following features, alone and/or in combination: a clamp having a cavity; inboard and outboard brake shoes displaceable along an axis; a brake lining mounted to the inboard and outboard brake shoes; a brake piston mounted in the cavity for displacing the inboard and outboard brake shoes and supporting the inboard brake shoe; an end face of the brake piston perpendicular to the axis and facing the inboard brake shoe; a recessed region in the end face; and an anti-rotation member extending outwardly from the inboard brake shoe and having a stop surface and a steering surface. The recessed region engages the stop surface to stop rotation of the brake piston in a first direction, and the recessed region engages the steering surface to allow rotation of the brake piston in a second direction. The first direction and the second direction are opposite.

According to this embodiment, the steering surface deflects towards the inboard brake shoe when the recessed region engages the steering surface.

According to the present embodiment, the disc brake assembly may further include: a spindle nut displaceable along the axis to support the brake piston on the inboard brake shoe; a spindle to which the spindle nut is threadedly connected; and a drive assembly that rotates the spindle to displace the spindle nut along the axis.

Drawings

FIG. 1 is a cross-sectional perspective view of a disc brake assembly having a prior art anti-rotation member for an electric parking brake.

Fig. 2 is a cross-sectional view taken along line 2-2 of fig. 1.

FIG. 3 is a perspective view of an anti-rotation member of the disc brake assembly of FIG. 1.

FIG. 4 is a perspective view of an end face of a brake piston of the disc brake assembly of FIG. 1.

FIG. 5 is a perspective view of the anti-rotation member of FIG. 3 engaged with the end face of FIG. 4.

Figure 6 is a perspective view of an anti-rotation member according to a first embodiment of the present invention.

Fig. 6A is an enlarged portion of fig. 6.

FIG. 7 is a first elevational view of the anti-rotation member of FIG. 6.

FIG. 8 is a second front view of the anti-rotation member of FIG. 6.

FIG. 9 is a perspective view of the anti-rotation member of FIG. 6 in a first operational position.

FIG. 10 is a perspective view of the anti-rotation member of FIG. 6 in a second operational position.

FIG. 11 is a perspective view of the anti-rotation member of FIG. 6 in a third operating position.

FIG. 12 is an elevational view of the anti-rotation member of FIG. 6 in a third operational position.

FIG. 13 is a first elevational view of the disc brake assembly having the anti-rotation member of FIG. 6.

Fig. 14 is a second front elevational view of the disc brake assembly of fig. 13.

Figure 15 is a perspective view of an anti-rotation member according to a second embodiment of the present invention.

Fig. 15A is an enlarged portion of fig. 15.

FIG. 16 is a first elevational view of the anti-rotation member of FIG. 15.

FIG. 17 is a second front view of the anti-rotation member of FIG. 15.

FIG. 18 is a perspective view of the anti-rotation member of FIG. 15 in a first operational position.

FIG. 19 is a perspective view of the anti-rotation member of FIG. 15 in a second operational position.

FIG. 20 is a perspective view of the anti-rotation member of FIG. 15 in a third operating position.

FIG. 21 is an elevational view of the anti-rotation member of FIG. 15 in a third operational position.

FIG. 22 is a first elevational view of the disc brake assembly having the anti-rotation member of FIG. 15.

Fig. 23 is a second front elevational view of the disc brake assembly of fig. 22.

Figure 24 is an elevation view of an anti-rotation member according to a third embodiment of the present invention.

Figure 25 is an elevation view of an anti-rotation member according to a fourth embodiment of the present invention.

Figure 26 is an elevation view of an anti-rotation member according to a fifth embodiment of the present invention.

An advantage of an embodiment is more efficient manufacturing of a disc brake assembly. A further advantage of an embodiment is reduced wear and/or damage to the disc brake assembly. Other advantages of the present invention will become apparent to those skilled in the art from the following detailed description of the preferred embodiments, when read in light of the accompanying drawings.