Combination cylinder with power-transmitting transmission having variable gear ratio

Patent metadata

Field	Value
Publication number	US-8991567-B2
Application number	US-74598808-A
Country	US
Kind code	B2
Filing date	Nov 27, 2008
Priority date	Dec 6, 2007
Publication date	Mar 31, 2015
Grant date	Mar 31, 2015

Abstract

The invention relates to a combination cylinder, including a service brake cylinder as an active service brake with at least one service brake piston actuated by a pressure medium, the piston actuating a brake mechanism via a service brake piston rod, and further including a spring-loaded brake cylinder as a passive parking brake with a spring-loaded brake piston actuated by a pressure medium against the action of at least one pre-loaded spring, wherein the spring-loaded brake piston in the event of the parking brake is actuated transmits the power of the at least one pre-loaded spring by means of a power-transmitting transmission to the service brake piston rod. According to the invention, the transmission is designed such that the movements of the spring-loaded brake piston and the service brake piston rod are coaxial and the power transmission increases with increasing stroke of the spring-loaded brake piston.

First claim

The invention claimed is:

1. A combination cylinder comprising: a service brake cylinder, as an active service brake, with at least one pressure-medium-actuated service brake piston which actuates a brake mechanism via a service brake piston rod; and
a spring store brake cylinder, as a passive parking brake, with a spring store brake piston actuated by a pressure medium counter to an action of at least one store spring, with the spring store brake piston of the spring store brake cylinder transmitting the force of the at least one store spring to the service brake piston rod via a force-transmitting gearing assembly included in the spring store brake cylinder when in a parking braking situation, wherein the force-transmitting gearing assembly includes a first angle lever and a second angle lever,
a thrust ring mounted so as to be rotationally fixed and configured to be actuated coaxially with respect to a central axis of the combination cylinder, wherein the thrust ring exerts axial forces on a spindle drive, wherein one part of the spindle drive is mounted in a rotationally fixed manner and the other part of the spindle drive is rotatably mounted coaxially with respect to the central axis, wherein rotational movement of the other part of the spindle drive is optionally blocked by a releasable rotational lock for axial force transmission between the rotationally fixed part and the rotatable part and optionally unblocked to eliminate the axial force transmission, wherein the rotational lock is arranged between the thrust ring and the rotatable part of the spindle drive,
at least one bearing journal arranged perpendicular to the central axis of the combination cylinder and formed on the thrust ring, wherein the bearing journal is pivotably mounted to the at least one angle lever assembly of the force-transmitting gearing assembly connected at one end to the spring store brake piston and connected at the other end to a fixed support surface of the combination cylinder such that, during an actuation of the spring store brake piston in the parking braking situation, a rotation of the at least one angle lever assembly about the bearing journal, and, therefore, an actuation of the thrust ring in the same direction, is triggered,
wherein the first angle lever and the second angle lever are symmetric in relation to the central axis, and are provided on the thrust ring such that a first torque generated by the first angle lever about an axis perpendicular to the central axis is compensated by a second torque generated by the second angle lever, and such that the movements of the spring store brake piston and the service brake piston rod are coaxial and a force transmission ratio becomes greater with progressive stroke of the spring store brake piston.

2. The combination cylinder of claim 1 , wherein the spindle drive includes a thread that is a non-self-locking thread.

3. The combination cylinder of claim 1 , wherein the releasable rotational lock is part of an emergency release device for the emergency release of the parking brake.

4. The combination cylinder of claim 1 , wherein there is an axial force transmission between the spindle drive and the service brake piston rod.

5. The combination cylinder of claim 1 , wherein the first angle lever and the second angle lever are rotatably mounted on the at least one bearing journal which extends outward perpendicular to the central axis of the combination cylinder, wherein the first angle lever and the second angle lever are arranged reversed in relation to one another with respect to a plane comprising the central axis of the combination cylinder.

6. The combination cylinder of claim 5 , further comprising a doubly articulately connected tension lug, wherein a first lever arm of the first angle lever is connected to the spring store brake piston via the doubly articulatedly connected tension lug.

7. The combination cylinder of claim 6 , wherein a second lever arm of the first angle lever is supported by a support roller configured to roll on the fixed support surface.

8. The combination cylinder of claim 7 , wherein the at least one bearing journal of the thrust ring bears sliding bodies, which sliding bodies being guided in sliding-block guides which extend in the direction of the central axis of the combination cylinder.

9. The combination cylinder of claim 8 , wherein the fixed support surface for the first angle lever is formed on a partition between the spring store brake cylinder and the service brake cylinder.

10. The combination cylinder of claim 1 , wherein the rotational lock comprises a manually actuable pawl configured to engage into an external toothing of the rotatable part of the spindle drive and which is rotatably mounted on the thrust ring.

11. A combination cylinder comprising: a service brake cylinder, as an active service brake, with at least one pressure-medium-actuated service brake piston which actuates a brake mechanism via a service brake piston rod; and
a spring store brake cylinder, as a passive parking brake, with a spring store brake piston actuated by a pressure medium counter to an action of at least one store spring, with the spring store brake piston of the spring store brake cylinder transmitting the force of the at least one store spring to the service brake piston rod via a force-transmitting gearing assembly included in the spring store brake cylinder when in a parking braking situation, wherein the force-transmitting gearing assembly includes a first angle lever and a second angle lever,
a thrust ring mounted so as to be rotationally fixed and configured to be actuated coaxially with respect to a central axis of the combination cylinder, wherein the thrust ring exerts axial forces on a spindle drive, one part of the spindle drive is mounted in a rotationally fixed manner and the other part of the spindle drive is rotatably mounted coaxially with respect to the central axis, wherein rotational movement of the other part of the spindle drive is optionally blocked by a releasable rotational lock for axial force transmission between the rotationally fixed part and the rotatable part and optionally unblocked to eliminate the axial force transmission, wherein the rotational lock is arranged between the thrust ring and the rotatable part of the spindle drive,
wherein the first angle lever and the second angle lever are symmetric in relation to a central axis of the combination cylinder, and the first angle lever and the second angle lever are provided in relationship to each other such that a first torque generated by the first angle lever about an axis perpendicular to the central axis is compensated by a second torque generated by the second angle lever, and such that the movements of the spring store brake piston and the service brake piston rod are coaxial and a force transmission ratio becomes greater with progressive stroke of the spring store brake piston,
wherein the spring store brake piston enables a first wedge contour to be actuated parallel to the central axis of the combination cylinder, wherein a first lever arm of the first angle lever can be guided along the first wedge contour, wherein the first lever arm of the first angle lever is rotatably mounted on the combination cylinder and a second lever arm of the first angle lever is supported on a thrust ring, wherein the thrust ring is mounted so as to be rotationally fixed and configured to be actuated coaxially with respect to the central axis of the combination cylinder, with a guidance of the first lever arm of the first angle lever along the first wedge contour causing a rotational movement of the first angle lever about a first lever rotational axis and therefore an axial fo

Assignees

• Kraus Harry-Werner
• Ostler Armin
• Fuderer Erich
• Mathieu Michael
• Ebner Christian
• Knorr Bremse Systeme

Inventors

• Kraus Harry-Werner
• Ostler Armin
• Fuderer Erich
• Mathieu Michael
• Ebner Christian

Classifications

• B60T17/083

  Combination of service brake actuators with spring loaded brake actuators · CPC title

• F16D65/16

  arranged in or on the brake · CPC title

• B60T17/086 Primary

  Spring loaded brake actuators with emergency release device · CPC title

• F16D2125/40

  Screw-and-nut · CPC title

• F16D55/2245

  in which the common actuating member acts on two levers carrying the braking members, e.g. tong-type brakes (similar brakes for rail vehicles B61H5/00) · CPC title