Parking brake arrangement
AssigneeFaiveley Transport Nordic AB
InventorTobias Persson
Life of this patent
Estimating the term…
Abstract
A parking brake arrangement for a brake unit—also having a service brake actuator—has in a housing (4) a clock spring (10) for exercising a rotary motion at will on a parking brake gear wheel (8) in drive connection with a device (5-7) for delivering brake force from the brake unit (1). The arrangement has two axially movable control sleeves (15, 16) in drive connection with the clock spring (10). The control sleeves form clutches (8′, 15 and 12, 16, respectively) with the parking brake gear wheel (8) and the housing (4), respectively. There are means (13, 18-21) for controlling the axial movements of the two control sleeves and the engagement of the two clutches in such a way that either one of them is always in engagement.
Claims14
A parking brake arrangement for a brake unit having a service brake actuator, said parking brake arrangement comprising:
- a housing;
- a spring means for exercising a rotary motion at will on a parking brake gear wheel in drive connection with a device for delivering brake force from the brake unit;
- two axially movable control sleeves in drive connection with the spring means and forming clutches with the parking brake gear wheel and the housing, respectively;
- and
- means for controlling the axial movements of the two control sleeves and the engagement of the two clutches in such a way that either one of them is always in engagement.
A method for applying and releasing a parking brake arrangement for a brake unit having a service brake actuator, said parking brake arrangement comprising:
- a housing;
- a spring means for exercising a rotary motion at will on a parking brake gear wheel in drive connection with a device for delivering brake force from the brake unit;
- two axially movable control sleeves in drive connection with the spring means and forming clutches with the parking brake gear wheel and the housing, respectively;
- and
- means for controlling the axial movements of the two control sleeves and the engagement of the two clutches in such a way that either one of them is always in engagement;
- the method comprising:
- applying the parking brake arrangement by axially positioning the control sleeves by said means for controlling the axial movements of the two control sleeves such that the clutch with the parking brake gear wheel is engaged and the clutch with the housing is open, thus allowing energy stored in said spring means to apply the parking brake;
- and
- releasing the parking brake by the service brake actuator providing a parking brake releasing rotation of said gear wheel which simultaneously winds up said spring means such that energy is stored in said spring means for subsequent brake force application, and then axially positioning said control sleeves such that the clutch with the parking brake gear wheel is open and the clutch with the housing is engaged.
A vehicle comprising a parking brake arrangement for a service brake actuator, said parking brake arrangement comprising:
- a housing;
- a spring means for exercising a rotary motion at will on a parking brake gear wheel in drive connection with a device for delivering brake force from the brake unit;
- two axially movable control sleeves in drive connection with the spring means and forming clutches with the parking brake gear wheel and the housing, respectively;
- and
- means for controlling the axial movements of the two control sleeves and the engagement of the two clutches in such a way that either one of them is always in engagement.
Dependencies are inferred from the claim text.