DE2160893A1 - COMPRESSION BRAKE DEVICE FOR VEHICLES WITH SPRING-APPLIED BRAKE CYLINDERS - Google Patents

Description

Make, December 2nd, 1971

TP1 -cl

-1023-

KNOKR-BREMSE GmbH., 8 Munich 13, Moosacher Str. 80

"Pressure medium braking device for vehicles with spring-loaded brake cylinders ¹¹ .

The invention relates to a pressure medium brake device for .Fahrzeuge, in particular pressure medium brake for rail vehicles, with a spring-loaded brake cylinder, its piston on the one hand by the force of a spring and on the other hand ', acting in the release direction of the brake, by the pressure medium pressure in one Loading space is loaded, the loading space being connected to the output port of a double check valve is connected, one input terminal of which, if applicable Via a brake valve with a supply pressure medium and its other input connection with an arbitrary operable pressure medium pump is in connection.

In the case of hydraulic brake devices of the above known type is with operational, released brake of the loading space of the spring brake cylinder with Pressure medium acted upon by the supply pressure medium source and kept in L5 order. If the supply pressure medium source becomes damaged and thus depressurized, escapes, depending on Type of pressure medium brake device, including the pressure medium

309825/0 * 58

- 2 -

from the application space of the spring-loaded brake cylinder either immediately or when the brake valve, if present, is actuated. The vehicle's brake is thus actuated via the spring-loaded brake cylinder. In order to subsequently release the brake, for example for maneuvering or towing the vehicle, despite an unpressurized supply pressure medium source, the pressure chamber of the spring-loaded brake cylinder can be refilled with pressure medium by means of the arbitrarily actuatable pressure medium pump. The double check valve switches over, whereby it blocks the connection το »loading space to the supply pressure medium source. Times the maneuvering or towing of the vehicle is required with the known pressure-medium braking devices to empty the pressurizing chamber of the spring brake cylinder by actuating a valve back, otherwise, after repair and recharging of the pressure storage medium source could fail the pressure-medium brake device of the vehicle: Namely, if By means of the pressure medium pump, which can be operated arbitrarily, a pressure exceeding the control pressure level of the supply pressure medium source has been pumped into the pressurization chamber, the double check valve remains in its switching position that shuts off this supply pressure medium source and in the event of a renewed pressure drop in the supply even after the supply pressure medium source has been recharged. Pressure medium source, this pressure drop cannot be reflected in the application

309825/0458

- 3 _.

continue space; the spring brake cylinder remains in In this case, despite the failure of the supply pressure medium source in its release position and cannot move into its braking position even by actuating the brake valve that may be present to be brought.

The invention is based on the object of a pressure medium "braking device to create of the type mentioned, in which the described deficiency of the known pressure medium brake devices is avoided, in which it is therefore ensured that when the supply is properly loaded, s-pressure medium source or proper actuation of the possibly existing brake valve regardless of any previous ones Emergency release processes by means of the arbitrarily actuatable pressure medium pump braking is always possible.

This object is achieved according to the invention in that in the line connection from the pressure medium pump to the double check valve a switching valve is arranged, which is controlled by the pressure at the supply pressure medium source only at The passage through the line connection falls below a certain pressure level at this supply pressure medium source releases, otherwise blocks this passage and the section leading from the switching valve to the double check valve the connecting line with a constantly pressureless pressure medium return or »the atmosphere.

309825 / 0AB8

In the drawing, two exemplary embodiments are shown from after; Invention designed pressure medium brake devices shown, namely shows

Fig. 1 a pneumatic and

2 shows a hydraulic pressure medium brake device.

According to Fig. 1 leads from a supply compressed air tank 1, which is constantly charged by a compressor, not shown is, a pipe 2 to an input port 3 of a double check valve 4. The second input port 5 of the double check valve 4 is via a section 6 of a line connection 6, 7 with a pipe connection 8 of a Switching valve 9 in connection. The switching valve 9 is piston controlled} when a control connection 10 is pressurized, it connects the pipe connection 8imith a vent 11 and

^ blocks a pipe connection 12, while it is depressurized

Control connection 10 under the force of a spring 13 automatically assumes a switching position in which it connects the pipe connections 8 and 12 to one another and shuts off the vent 11. The section 7 of the line connection 6, 7 leads from Pipe connection 12 of the switching valve 9 to a hand or foot operated air pump 14. The output connection 15 of the double check valve 4 is via a pipe 16 with

309828/0463

- ■ 5 -

the loading space 17 of a spring-loaded brake cylinder 18 in connection. The spring brake cylinder 18 has a piston 20 which delimits the loading space 17 and is on the other hand loaded by a storage spring 19 to which the linkage, not shown, of the vehicle brake is articulated via a piston rod 21. Of the Pipeline 2 leads a control line 22 to the control input 10 of the switching valve 9.

ι When the compressed air reservoir 1 is charged, the "Pipeline 2 and the control line 22 of the control connection 10 of the switching valve 9 is pressurized with compressed air and the switching valve 9 assumes its illustrated switching position against the force of the spring 13. Section 6 of the line connection 6, 7 is therefore connected to the vent 11 and thus independent of any actuation of the air pump 14 pressureless. The shut-off piston 23 of the double check valve 4 is therefore located in its section 6 shutting off and the pipes 2 and 16 connect to one another end switch position. He holds 1 from the compressed air supply is therefore via the pipeline 2, the double check valve 4 and the pipeline 16 also the application space 17 of the Spring-loaded brake cylinder 18 filled with compressed air and the piston 20 is against the force of the spring 19 according to FIG Fig. 1 is pressed into its left, the brake of the vehicle released holding position.

309825/0458

Of course, the vehicle is also equipped with a further, not shown in Fig. 1 and preferably aiis the supply It is more common to have 1 powered compressed air brake Type equipped as a service brake.

If the supply compressed air tank 1 as a result of any If the pressure is damaged or depressurized for other reasons, the compressed air also escapes from the application space 17 ″ and. the accumulator spring 19 pushes the piston 20 to the right according to FIG. 1, the brake of the vehicle being actuated via the piston rod 21. It is thus ensured that bein If the compressed air supply fails, the vehicle is braked. The control connection is also connected to the compressed air reservoir 1 10 of the switching valve 9 without pressure and the spring 13 switches the switching valve 9 over in such a way that the section 6 separated from the vent 11, the two sections 6 and 7 connected to one another and thus the passage through the Line connection 6, 7 is released.

If the vehicle that has been braked in this way is to be maneuvered or towed, the air pump 1A- can be operated via the Line connection 6, 7 and the switching double check valve 4- - through the input port 5 from the Air pump 14 pending compressed air is the switching piston 1J of the double check valve 4 according to FIG. 1 printed in its left position - as well as the pipeline 16 of the loading

309825/0458

Space 17 are filled with compressed air until the piston 20 counteracts the force of the storage springs 19 is pushed to the left again and the vehicle brake is released. The double check valve 4 prevents the compressed air from flowing out of the application space 17 through the pipeline 2 and a non-return valve (not shown) contained in the air pump 14 prevents the compressed air from flowing out by the pump 14. The vehicle can now be moved.

Should the brake of the vehicle be driven as described above emergency release caused by actuating the air pump 14 can be applied again, so can. the air pump 14 are brought into a switching position in which the in their built-in check valve, not shown, is forcibly opened and the compressed air from the application area 17. Via the double check valve 4, the switching valve 9 ihicL the air pump 14 escapes into the atmosphere. If the air pump 14 does not have such a device for opening the built-in check valve, as in FIG Fig. 1 indicated by dash-dotted lines, a in a then to be provided, from the section 7 of the line connection 6, 7 to the atmosphere leading connection 24 classified shut-off valve are opened briefly. With the emptying of the loading area 17, the vehicle brake is actuated again by the force of the accumulator spring 19.

If after one as described above by pressing

309825/0458

-8th -

the air pump 14 took place emergency release of the compressed air reservoir 1 is recharged with compressed air, compressed air reaches the pipe 2 and the control line 22 Control connection 10 of the switching valve 9 and switches this against the force of the spring 13 to. The section 6 of the line connection 6, 7 is separated from the section 7 and connected to the vent 11. The section 6 of the line connection is therefore depressurized in any case, so that the on Input connection 3 pending compressed air from the compressed air reservoir 1 is able to push the switching piston 23 of the double check valve 4 into the illustrated right end position, in which the section 6 is separated from the pipeline 16 and the pipeline 16 is connected to the pipeline 2 · The normal operating state of the pressure medium brake device is thus automatically reached again; also a Excessive charging of the application space 17 during the emergency release process can switch this over to normal operation do not hinder

In the hydraulic braking device according to FIG. 2 is a. Oil sump 30 is provided, from which a pump 31. Constantly conveys pressure medium into a pipe 32, which thus represents a supply pressure medium source. An overflow valve 33, which is set to the control pressure level, leads from the ¹ pipe 32 back to the oil sump 4 in order to avoid overloading the pipe 32. The pipe 32 leads to a brake valve

30982S / CU58 _n '■

til 3 ^ j by means of which the pressurization of a pipe 35 is arbitrarily adjustable. A return line 36 leads back from the brake valve yv to the oil sump 30. The pipe 35 is connected to the input connection 3 'of the double check valve 4 ¹ , the output connection 15' of which is connected via the pipe 16 'to the loading space 17' of the spring-loaded cylinder 18 '. From the second pipe connection 5 ^{1 of} the double check valve 4 *, the line connection 6 ¹ , 7 'leads as described for FIG. 1 via the switching valve 9 ^1, which corresponds in its function to the switching valve 9 according to FIG. 1, to the arbitrarily actuatable pump 14 ^! . The pump 14 ¹ is designed to be self-sucking; Its suction connection is connected to the oil sump 30 via a return line 37. A line connection 38 leads from the outlet 11 * of the shell tv; entiles 9 ¹ to the return line 37. A shut-off valve 25 'is arranged between the section 7' of the line connection 6 ', 7 ^{1 and the return line 37.} From the pipeline 35, the control line 22 'leads to the control input 10' of the switching valve 9

When the brake is released and ready for operation, the pump 31 delivers Pressurized oil into the pipe 32 and through this connection releasing brake valve 34, the pipe 35 »the double check valve 4 'and the pipeline 16' into the application space 17 'of the spring-loaded cylinder 18', which as a result which takes its release position. The switching valve 9 '

309825/0458

- 10 -

connects the section 6 ^{1 of} the line connection 6 ′, 7 ¹ via the drilling line 38 and the return line 37 to the oil sump 30.

For braking, the pressure in the bore line 35 and thus the pressure chamber 17 'is reduced by means of the brake valve 34 through the oil outlet through the return 36 into the oil sump; ^ egen the vehicle brake. To release the brake, the pressure in the application space I7 ^{1 is} increased again to the full control pressure level by means of the brake valve 34.

If the pump 3I or the brake valve 34 fails, the pipeline 35 and thus the pressure chamber 17 'of the spring-loaded cylinder 18' are depressurized and the vehicle brake is actuated at the latest when the brake valve 34 is actuated. For emergency release of the brake pressure medium can now by means of the pump 14 'with a closed shut-off valve 25' through the 'open line connection 6' as a result of switching the shift valve 9, 7 ¹ and the up-switching double check valve to be pumped 4- 'in the pressurizing chamber 17'. By opening the shut-off valve 25 ', after such an emergency release of the brake, the application space I7 ^{1 can} be emptied at will in order to actuate the brake again.

If (but with the emergency brake still released via pump 3I

309825/0458

- 11 -

and the brake valve 3 ^ again pressure medium into the pipeline 35 can be controlled, pressure medium also passes through the control line 22 'to the control input 10' of the switching valve 9 'and brings this back into the switching position shown.

The section 6 'of the line connection 6 ¹ , 7 ¹ is therefore connected to the oil sump 30 and depressurized; the pending in the pipeline 35 pressure, it is possible damit-, the double check valve 4- ¹ switch back uril the connection to the conduit 16 'to open. The normal operating state of the hydraulic braking device is thus automatically reached again.

The inclusion of the switching valve 9 or 9 ¹ in the line connection 6, 7 or 6 ¹ , 7 ¹ ensures that when the pressure returns in the compressed air reservoir 1 or the pipe 35, the double check valve 4, 4 ¹ in its normal switching position returns to which it

the supply compressed air tank 1 or the pump 5 ^ via the brake valve 3A- with the loading space 17 or 17 'of the spring-loaded cylinder 18 or 18' connects.

3Q9825 / CK58

- 12

Claims (2)

Claims 1. Pressure medium brake device for vehicles, in particular pressure medium brake for rail vehicles, with a spring-loaded brake cylinder, the piston of which is loaded on the one hand by the force of a spring and on the other hand, acting in the release direction of the brake, by the pressure medium pressure in a loading space, the loading space being connected to the output connection of a double check valve is connected, one input connection of which is connected, if necessary via a brake valve, to a supply pressure medium source and the other input connection of which is connected to an arbitrarily actuatable pressure medium pump, characterized in that the line connection (6, 7 or 6 ', 7 ¹ ) from the pressure medium pump (14- or 14- ') to the double check valve (4- or 4 · ¹ ) a switching ^{valve (9 or 9 1} ) is arranged, which depends on the pressure at the supply pressure medium source (1 or 3I) controlled only when the pressure drops below a certain pressure level at this supply pressure medium source the D Releases passage through the line connection, otherwise blocks this passage and connects the section (6 or 6 ') of the connection line leading from the switching valve to the double check valve with a continuously pressureless pressure medium return (11', 38) or the atmosphere (11). 309826/0458 - 13 - 2. • Pressure medium brake device according to claim. 1, characterized in that a control line (22 or 22 ¹ ) leads from the supply pressure medium source (i or 31) to the control input (10 or 10 ') of the pressure medium actuated switching valve (9 or 9'). 3 0 9 8 2 '6 I 0 A 5 8 Blank page