DE102017206719A1 - Control cylinder arrangement for a brake release device, brake release device and brake assembly - Google Patents

Abstract

The invention relates to an actuating cylinder arrangement (1) for a brake release device (100), comprising: a cylinder unit (2) with a pipe section (3) closed at one end with a bottom (4), a piston unit (10) with a piston head (13) and a piston rod (10), wherein the piston head (13) in the tube section (3) along a longitudinal axis (15) is arranged displaceably and the piston rod (10) passes through the bottom (4), an inner surface (6) of the tube section (3) and an inner surface (7) of the bottom (4) on the one hand and a piston rod end face (16) of the piston head (13) on the other hand defining a pressure chamber (8), wherein in the pipe section (3) a connecting line (20) is formed, which from a bottom (4) facing away from the end face (21) of the pipe section (3) forth in the pressure chamber (8) opens, and so a communicating connection between a to the end face (21) connectable fluid supply (52) and the pressure chamber (8) forms, so that b ei on the fluid supply (52) and the connecting line (20) performed pressure build-up in the pressure chamber (8) of the piston head (13) on the piston rod (11) exerts a tensile force (F). The invention further relates to a brake release device (100) and a brake assembly (200).

Description

TECHNICAL AREA

The present disclosure relates generally and more particularly to an actuator cylinder assembly for a brake release device, a brake release device, and a brake assembly

TECHNICAL BACKGROUND

There are generally a variety of spring-loaded brake systems are known in which a spring force acts on a force-enhancing lever system on brake elements, which in turn attack on a corresponding brake body (for example, a disc or a drum). They are usually designed as safety brakes and work on the fail-safe principle. This means that the brakes are designed so that they automatically close in the event of a fault, for example in the event of a power failure, and bring the moving parts to be braked to a standstill as quickly as possible or hold them in a specific position (for example, in the case of hoists or elevators).

For this it is first necessary to keep the brakes in the open, ie in the released state. Serve so-called brake release devices, which work in the activated state against the brake spring force, these cancel, open the brake and hold in the (open) ventilated state. Particularly common are electro-hydraulic brake release devices that act on the brake lever linkage parallel to the brake spring.

There are brake release devices that work according to the following principle: To release or release the brake, a drive (usually an electric motor) is set in motion. This drive acts on a centrifugal pump, which puts a hydraulic medium under pressure and promotes in operation, which in turn acts on a cylinder piston surface which is coupled via an actuating rod with the brake lever linkage. In this case, at a certain speed, a certain pressure acts on the actuating piston surface, which in turn exerts a certain actuating force on the linkage and thus neutralizes the restoring force of the brake spring and keeps the brake assembly in the opened state.

Another approach is to operate a Bremslüftgerät in intermittent operation, ie after the establishment of a certain operating pressure on the cylinder this is held by suitable switching valves and degraded again for braking. Such a brake release device is for example from the DE 10 2013 105 446 A1 known. In such a brake release device, the required working pressure is built up in a control cylinder arrangement via a pump. The working pressure is so high that an actuating piston, which is adjustable in the cylinder tube of the actuating cylinder assembly assumes a first working position (extended state) in which it overcomes the forces of a brake spring and keeps the brake assembly in the open or ventilated state. Once the required working pressure is established, the pump is turned off and acting between the actuating cylinder assembly and hydraulic pump check valve prevents the pressure reduction from the actuating cylinder assembly.

The actuating cylinder assemblies or actuating cylinder units in the brake release devices described above are adapted to build on a force-enhancing brake lever linkage of the actual brake spring action opposing thrust or pressure force.

But there are also brake assemblies in which the actual braking force is applied via directly acting on brake levers compression springs. The compression spring acts on a brake caliper on brake elements. Compression spring and brake elements are arranged at each opposite ends of an articulated mounting of the caliper levers. In such brake lever assemblies, it is necessary to contract the adjusting lever ends against the spreading spring force to spread the brake lever ends.

For brake release devices, which build up a thrust, a deflection linkage is required, which makes a space-saving arrangement difficult. Alternatively, two brake levers would be required to control two lever ends, which would each have to be supported at a fixed point.

The object is therefore to provide an improved brake release device, which is to be arranged in a compact manner between the two ends of the adjusting lever of the above-described brake assembly and can apply the appropriate tensile force to contract the levers.

A further object can be seen to provide a compact brake release device which is operable in intermittent operation and having a suitable actuating cylinder arrangement.

SUMMARY

According to a first aspect, the present disclosure shows a control cylinder assembly for a brake release device, comprising: a cylinder unit having a pipe section closed at one end with a bottom, a piston unit with a piston head and a piston rod, wherein the piston head in the pipe section along a Longitudinal axis is arranged displaceably and the piston rod passes through the bottom, wherein an inner surface of the pipe section and an inner surface of the bottom on the one hand and a piston rod side end face of the piston head on the other hand define a pressure chamber, wherein in the pipe section at least one connecting line is formed, the forth from the bottom end face of the pipe section into the pressure chamber opens and so forms a communicating connection between a connectable to the end face fluid supply and the pressure chamber, so that when a carried out via the fluid supply and the connecting line pressure buildup in the pressure chamber, the piston head exerts a tensile force on the piston rod.

Another aspect relates to a functional unit with a control cylinder receptacle for receiving a control cylinder arrangement according to the invention.

Another aspect relates to a brake release device with an actuating cylinder arrangement according to the invention and a functional unit according to the invention. Another aspect relates to a brake assembly, in particular a wheel brake assembly, with a brake release device according to the invention.

Other aspects and features will become apparent from the dependent claims, the accompanying drawings and the following description of embodiments.

list of figures

• 1 eine perspektivische Ansicht einer Ausführungsform eines erfindungsgemäßen Bremslüftgeräts;
• 2 eine Schnittdarstellung des in 1 gezeigten Bremslüftgeräts mit einer erfindungsgemäßen Stellzylinderanordnung;
• 3 eine vergrößerte Darstellung des Bereichs A aus 2;
• 3a eine vergrößerte Darstellung des Bereichs B aus 3,
• 3b eine perspektivische Ansicht eines Ausschnitts einer Stellzylinderaufnahme;
• 4 einen schematischen Schaltplan eines erfindungsgemäßen Bremslüftgeräts und
• 5 eine Bremsanordnung mit einem erfindungsgemäßen Bremslüftgerät.

Embodiments will now be described by way of example and with reference to the accompanying drawings. It shows:

• 1 a perspective view of an embodiment of a brake release device according to the invention;
• 2 a sectional view of the in 1 shown Bremslüftgeräts with an actuating cylinder arrangement according to the invention;
• 3 an enlarged view of the area A from 2 ;
• 3a an enlarged view of the area B from 3 .
• 3b a perspective view of a section of a actuating cylinder receptacle;
• 4 a schematic circuit diagram of a brake release device according to the invention and
• 5 a brake assembly with a brake release device according to the invention.

DESCRIPTION OF EMBODIMENTS

Before a detailed description of the embodiment with reference to 1 First, general explanations of the embodiments follow.

The invention is characterized in that in the pipe section, a connecting line is formed, which opens from a bottom surface facing away from the bottom of the pipe section into the pressure chamber and so forms a communicating connection between a connectable to the end face fluid supply and the pressure chamber, so at a the fluid supply and the connecting line pressure build-up in the pressure chamber of the piston head on the piston rod exerts a tensile force.

Characterized in that the connecting line is formed in the pipe section itself, it is possible to realize a very compact actuating cylinder assembly, without requiring additional lines would be required to make a piston assembly with tensile force.

Next, the fluid supply is very much simplified by this can be done directly over the end face (at the open end of the pipe section). The fluid supply is realized by simply applying or "docking" the fluid supply to the corresponding end face.

There are embodiments in which a plurality of connecting lines distributed over the circumference of the pipe section are formed in the pipe section. This makes it possible to increase the flow cross-section and thus also the effective speed of a suitably equipped brake release device.

An increase in the wall thickness of the pipe section makes it possible to increase the effective diameter of the connecting line (s). As an effective flow cross-section, almost the entire end face of the open tube section is available. This means that even very high quantities of fluid can be pumped into and out of the pressure chamber in a short time.

There are embodiments in which the connecting line (s) open into the pressure chamber via an annular groove formed radially in the tube section. Such a design is particularly easy to manufacture. The connecting lines can be introduced via longitudinal bores which run parallel to a longitudinal axis (or rotation axis) of the pipe section, and can then be connected to the pressure chamber by introducing the radial annular groove. The radial extent of the annular groove is chosen such that the connecting line bores are cut in the desired axial position (preferably approximately in the region of the bottom), in which the connecting lines terminate.

There are embodiments in which the annular groove is formed between an annular shoulder and the bottom, wherein the inner diameter of the shoulder is smaller than the outer diameter of the piston head. A piston-side end face of the shoulder thus serves as a stop for the piston head (on the piston rod end side). By this design it is ensured that the piston head does not abut the bottom of the cylinder unit itself and thus the peripheral surface of the piston closes the pressure chamber. Rather, it is always ensured that a minimal pressure chamber remains, into which an unimpeded supply of fluid via the connecting line (s) or the annular groove can take place to build up the pressure.

There are embodiments in which the connecting line opens between two sealing regions in the end face of the pipe section. These sealing regions make it possible to ensure the supply of fluid into the connecting lines. This can then take place in the entire annular region between the two sealing regions in the end face of the pipe section. Thus, the circumferential position of the connecting line during assembly of the cylinder unit (which runs parallel to the axis of rotation) may be arranged without prior determination in the entire region of the fluid supply.

There are embodiments in which the connecting line opens into a distribution groove formed between the sealing regions. In this embodiment, the actual fluid supply can be done locally at any circumferential position in this distribution groove. So it is practically enough an opening as a fluid supply, which opens at any circumferential position in the corresponding distribution groove. The connecting line or the connecting lines can be arranged elsewhere than the local fluid supply, the fluid distribution takes place via the distributor groove.

There are versions in which the sealing regions are formed as O-ring receptacles. This ensures a pressure-technically clean seal or a leakage-free and maintenance-friendly connection of the fluid supply to the end face of the pipe section.

In one embodiment, in which a functional unit is provided, which has a control cylinder receptacle for receiving a control cylinder assembly according to the invention and in the actuating cylinder receiving a fluid supply for connection to the end face (open end) of the pipe section is formed, the actuating cylinder arrangement can be particularly simple and realize the fluid supply via the functional unit.

The functional block can be formed in one piece and includes all necessary supply and discharge lines, which open into the fluid supply and are required for pressure build-up and reduction in the pressure chamber.

There are embodiments in which the fluid supply is designed as an annular groove in a connection bottom of the cylinder receptacle. In the annular groove then opens a fluid supply line. Through this Ringnutausführung the orientation in the circumferential direction of the actuating cylinder assembly in the actuating cylinder recording of the functional unit is also completely free. It also facilitates the design of the functional unit itself, since the required fluid supply line can open at any point of the entire circumference of the annular groove. It is also possible to provide a plurality of fluid supply lines (for example, if separate fluid supply and removal is to be realized).

A brake release device which has an actuating cylinder arrangement according to the invention or a functional unit according to the invention can be realized as a very compact and reliable, low-maintenance brake release device for the switch-off operation, in which a tensile force can be applied via the piston rod.

There are embodiments in which the actuating cylinder arrangement and the functional unit are coupled to one another via a screw connection. Such an embodiment is particularly simple, since the sealing of the actuating cylinder assembly in the functional unit can not be done via an additional sealing base, but over the end face of the pipe section of the actuating cylinder assembly in the actuating cylinder receiving the functional unit.

By means of the fluid supply realized according to the invention, the screwing-in position in the circumferential direction of the actuating cylinder arrangement is freely selectable in such a design.

A brake assembly, in particular a Radbremsanordnung, with a brake release device according to the invention is particularly space-saving and compact gestaltbar, since the Bremslüftgerät can be arranged parallel to a brake spring assembly, since the required train (Lüft-) force is applied directly to the articulated also from the brake lever lever rod , Coming back to 1 , This illustrates an embodiment of a brake release device according to the invention 100 ,

1 shows a brake release device 100 with a tank assembly 110 , a drive assembly 120 , a connection box 130 and a port cover 140 , At the end of the drive assembly are eyelets 121 provided, with which the brake release device can be coupled to the linkage of a brake assembly (see. 5 ). From the tank assembly 110 protrudes one end of a piston rod 11 also with a connection eye 12 is provided. The connection eye 12 is also coupled to a brake assembly (see. 5 ).

The authoritative internal structure shows the 2 , In the drive module 120 is an electric motor 122a arranged, a pumping unit 122b drives, which in a recess of a functional unit 50 is arranged, which is the drive assembly 120 with the tank assembly 110 combines.

Within the functional unit 50 is a recording 51 worked out in which an actuating cylinder assembly 1 is arranged. The actuating cylinder arrangement 1 includes a cylinder unit 2 holding a pipe section 3 and a floor 4 includes the pipe section 3 closes at one end. The cylinder unit 2 is integrally formed. The open end of the pipe section 3 is over an external thread 5 with the recording 51 screwed. Inside the cylinder unit 2 is the piston unit 10 arranged the piston head 13 and the piston rod 11 includes. The piston rod passes through 11 the ground 4 and continues through a lid 111 led to the outside.

The functionally relevant part of the actuating cylinder arrangement 1 will continue on the basis of 3 described, which shows the dot-dash area A enlarged. The piston head 13 is inside the pipe section 3 about sealing and guiding elements 14a linearly guided and along the axis of rotation 15 displaceable.

Between the piston rod-side end face 16 and an inner surface 6 of the pipe section 3 as well as an inner surface 7 of the soil 4 the cylinder unit 2 is a pressure room 8th Are defined. The piston rod 11 is about sealing and guiding elements 14b, which are in the ground 4 are arranged, slidable through the ground 4 guided. This is the pressure chamber 8th against the tank room 112 (see. 2 ) and the interior area 9 in the pipe section 3 sealed.

In the pipe section 3 are several parallel to the axis of rotation 15 running connecting lines 20 provided in a fluid supply 52 open, as an annular groove in the bottom of the recording 51 is formed (see also 3b ). For sealing the fluid supply 52 or the connecting lines 20 to the outside (to the thread) or to the interior area 9 are frontally on the face 21 of the pipe section 2 ring grooves 22 and 23 provided for receiving O-rings (see. 3a ). Into the fluid supply 52 open inflow channels 53 , about with the pump 122b from the tank room 112 a pressurized fluid (eg hydraulic fluid) in the fluid supply 52 is encouraged.

For the function of the actuating cylinder arrangement 1 the following applies: pumps the pump 122b driven by the electric motor 122a Pressurized fluid over the or the inflow channels 53 in the fluid supply 52 , this passes through the connecting lines 20 in the pressure room 8th , The internal pressure built up there P acts on the piston rod end face 16 of the piston head 13 and exerts on it a force FS out, which is a pulling force on the piston rod 11 exercise and continue on the eyelet 12 from which it can act on a brake assembly.

The connection between the connecting lines 20 and the pressure room 8th via a radially formed annular groove 24 which the connecting lines 20 to the pressure room 8th opens. Between this radial annular groove 24 and the piston rod side end face 16 is a shoulder 25 arranged, whose piston-side end face 26 a stop for the piston head 13 forms. This prevents the rod side end face 16 of the piston head 13 to the ground 4 the cylinder unit 2 strikes and so the pressure chamber 8th closes.

Will the pressure from the pressure chamber 8th over the connecting line 20 and the fluid supply 52 , which then serves as a fluid discharge, dismantled, causes a at the connection eye 12 attacking traction that the piston head 13 over the piston rod 11 against the shoulder 25 is pulled.

When pressure builds up again, the piston head becomes 13 towards the bottom of the picture 51 pushed.

In an alternative embodiment, the fluid supply 52 not as a groove in the recording 51 worked out, but as well-designed annular groove 21a in the frontal area 21 of the pipe section 3 , In such an embodiment, the fluid supply 52 accounted for and the inflow channels 53 can directly into the ring groove 21a in the frontal area 21 open, between the annular grooves 22 . 23 is designed for the O-rings.

4 shows the schematic diagram of the brake release device according to the invention 100 with the pump 122b coming out of the tank 112 via a check valve 123 a pressurized fluid via one or more inflow channels 53 in the fluid supply 52 conducts and continues over one or more interconnections 20 in the pressure room 8th the actuating cylinder assembly 1 ,

The pressure can optionally be via a pressure sensor 124 be monitored. A pressure relief valve 125 prevents overloading of the system. For pressure reduction are two normally open two-way valves 126 provided in the open position, the pressurized fluid back into the tank 112 let it flow. Optional is a throttling 129 upstream.

Optionally, a hand pump is available for emergency operation 127 provided with the likewise pressurized fluid via a check valve 123 in the fluid supply 52 can be promoted. This system is also via a pressure relief valve 125 hedged. To prevent backflow during manual operation, there is a deadman switch 128 to operate, the backflow into the tank when actuated 112 blocked.

5 shows the basic structure of a brake assembly 200 , which is designed here as a wheel brake. The brake assembly 200 includes two brake lever assemblies 210 , the pincers on a brake yoke 220 are pivotally mounted. At one end of the brake lever 210 are each braking elements 230 Arranged on a wheel 240 act when a brake spring assembly 250 the opposite ends of the brake levers 210 pushes apart.

For releasing or keeping open the brake assembly 200 is the brake release device according to the invention 100 provided, which in operation on the eyelets 121 and 12 the brake levers 210 contracts against the spring force and thus the brake elements 230 from the wheel 240 solves.

Further embodiments and variations of the invention will be apparent to those skilled in the claims.

LIST OF REFERENCE NUMBERS

100

brake lifting device

110

tank assembly

111

cover

112

Tankage / Tank

120

drive assembly

121

on lugs

122a

electric motor

122b

Pump unit / pump

123

check valve

124

Pressure sensor, measuring connection

125

Pressure relief valve

126

2/2 way valve

127

hand pump

128

deadman

129

throttling

130

junction box

140

terminal cover

200

brake assembly

210

brake lever assembly

220

Brake Caliper

230

braking element

240

wheel

250

Brake spring assembly

1

Actuating cylinder arrangement

2

cylinder unit

3

pipe section

4

ground

5

external thread

6

Inner surface pipe section

7

Inner surface ground

8th

pressure chamber

9

The indoor section

10

piston unit

11

piston rod

12

connection eye

13

piston head

14a, b

Sealing and guiding element

15

axis of rotation

16

piston rod-side end face

20

connecting line

21

face

21a

alternative ring groove (distributor groove)

22, 23

Ring groove for O-ring

24

radial annular groove

25

shoulder

26

face

50

functional unit

51

admission

52

fluid supply

53

inlet channels

P

internal pressure

FS

force

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102013105446 A1 [0005]

Claims (11)

An actuating cylinder arrangement (1) for a brake release device (100), comprising: a cylinder unit (2) having a pipe section (3) closed at one end with a bottom (4), a piston unit (10) with a piston head (13) and a piston rod (10), wherein the piston head (13) is displaceably arranged in the tube section (3) along a longitudinal axis (15) and the piston rod (10) passes through the base (4), an inner surface (6) of the pipe section (3) and an inner surface (7) of the bottom (4) on the one hand and a piston rod-side end face (16) of the piston head (13) on the other define a pressure space (8), wherein in the pipe section (3) a connecting line (20) is formed, the one of the bottom (4) facing away from the end face (21) of the pipe section (3) forth in the pressure chamber (8) opens, and so forms a communicating connection between a to the end face (21) connectable fluid supply (52) and the pressure chamber (8), so that in a via the fluid supply (52) and the connecting line (20) performed pressure build-up in the pressure chamber (8) of the piston head (13) on the piston rod (11) exerts a tensile force (F). Adjusting cylinder arrangement (1) according to Claim 1 in which the connecting line (20) opens into the pressure chamber (8) via an annular groove (24) formed radially in the pipe section (3). Adjusting cylinder arrangement (1) according to Claim 1 or 2 in which the annular groove (24) is formed between an annular shoulder (25) and the base (4), wherein the inner diameter of the shoulder (25) is smaller than the outer diameter piston head (13), so that a piston-side end face (26) the shoulder (25) forms a stop for the piston head (13). Adjusting cylinder arrangement (1) according to Claim 1 . 2 or 3 in which the connecting line (20) between two sealing regions (22, 23) opens into the end face (21) of the pipe section. Adjusting cylinder arrangement (1) according to Claim 4 in which the connecting line (20) opens into a distributor groove (21a) formed between the sealing regions (22, 23). Adjusting cylinder arrangement (1) according to Claim 4 or 5 in which the sealing regions (22, 23) are formed as O-ring receptacles. Functional unit (50) with a control cylinder receptacle (51) for receiving a control cylinder arrangement (1) according to one of Claims 1 to 6 , wherein in the actuating cylinder receptacle (51) a fluid supply (52) for connection to the end face (21) of the pipe section (3) is formed. Function unit (50) after Claim 7 , wherein the fluid supply (52) is formed as an annular groove in a connection bottom of the actuating cylinder receptacle (51) into which a fluid supply line (53) opens. Brake release device (100) with an actuating cylinder arrangement (1) according to one of Claims 1 to 6 and a functional unit (50) according to one of Claims 7 or 8th , Brake release device (100) according to Claim 9 in which the actuating cylinder arrangement (1) and the functional unit (50) are coupled to one another via a screw connection (5). Brake assembly (200), in particular wheel brake assembly, with a brake release device (100) according to Claim 9 or 10 ,

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