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1. WO2021110272 - SPRING BRAKE ACTUATOR AND RETAINING DEVICE FOR SUCH SPRING BRAKE ACTUATOR

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

Claims

1. A spring brake actuator (2), in particular a parking or emergency spring brake actuator (2) for use in a commercial vehicle, said actuator (2) comprising:

- a cylinder housing (4) comprising a cylinder housing base (6),

- a spring brake piston (10) located in said cylinder housing (4) for applying a braking force,

- a spring guide (12) being attached to the spring brake piston (10),

- a compression spring (8) located between the cylinder housing base (6) and the spring guide (12) of the spring brake piston (10), said compression spring (8) being effective to push the spring brake piston (10) away from the base (6), wherein the spring guide (12) comprises a valve (14) and a retaining device (16) for retaining the valve (14), the retaining device (16) comprising a basic body (34) and clamping means (36) for clamping the device (16) to a spring guide (12),

characterized in that the clamping means (36) are arranged at the basic body (34) and along a circumference (38) of the basic body (34),

wherein the clamping means (36) are spaced apart from each other forming slits (40) between the clamping means (36) to allow for a circulation of air through the slits (40).

2. The spring brake actuator (2) according to claim 1 ,

characterized in that the basic body (34) has the shape of a disc.

3. The spring brake actuator (2) according to claim 1 or 2, characterized in that the retaining device (16) comprises a circular groove (50) being arranged circumferentially around a longitudinal axis (42) of the basic body (34).

4. The spring brake actuator (2) according to claim 3,

characterized in that the circular groove (50) is V-shaped (52).

5. The spring brake actuator (2) according to claim 3 or 4,

characterized in that the retaining device (16) has a first side (44) and a second side (46), the second side (46) being arranged axially opposite of the first side (44), wherein the circular groove (50) is arranged at the first side (44), only.

6. The spring brake actuator (2) according to any of the preceding claims, characterized in that the clamping means (36) extend diagonally outwards from the basic body (34) in an angle (54) of 1° - 60° relative to the longitudinal axis (42), preferably 25-40°.

7. The spring brake actuator (2) according to any of the preceding claims, characterized in that the clamping means (36) are integrally formed with the basic body (34).

8. The spring brake actuator (2) according to any of the preceding claims, characterized in that the basic body (34) comprises 5 - 20 clamping means (36), preferably 8 clamping means (36).

9. The spring brake actuator (2) according to any of the preceding claims, characterized in that the slits (40) between the spaced apart clamping means (36) have a width (ws) of 0,3 - 2 mm, preferably 0,7 mm.

10. The spring brake actuator (2) according to any of the preceding claims, characterized in that the basic body has a thickness (tb) of 0,5 mm - 2 mm, preferably 1 mm.

11. The spring brake actuator (2) according to any of the preceding claims, characterized in that the clamping means (36) comprise a circular shoulder (48) for positioning the retaining device (16) in the spring guide (12).

12. The spring brake actuator (2) according to any of the preceding claims, characterized in that the retaining device (16) is partially or completely made of sheet metal, preferably steel or aluminum sheet metal, and/or plastic, preferably crystalline or semi crystalline plastic, particularly preferred polypropylene ter- ephtalate (PPT), polyamide (PA), polyoxymethylene (POM), polyphthalamide (PPA), or polypropylene (PP), or a combination of several of the above.

13. A retaining device (16) for retaining a valve (14), the retaining device (16) comprising a basic body (34) and clamping means (36) for clamping the device (16) to a spring guide (12),

characterized in that the clamping means (36) are arranged at the basic body (34) and along a circumference (38) of the basic body (34),

wherein the clamping means (36) are spaced apart from each other forming slits (40) between the clamping means (36) to allow for a circulation of air through the slits (40).