Spring brake cylinder

Abstract

The invention relates to a spring brake cylinder (100) for a brake of a rail vehicle, comprising a cylinder housing (120), a pressure-reservoir piston (6) which can be moved axially within the cylinder housing (120) and which can be moved by a spring (14, 16) in order to actuate the brake in the event of a pressure drop and by a pressure-reservoir chamber (18) that can be applied with pressure medium in order to release the brake, a piston rod (24) that can be axially moved by the pressure-reservoir piston (6), an emergency release device for manually unblocking the brake without pressure medium, wherein the emergency release device has an emergency release actuation device and an emergency release mechanism (140) that can be actuated by same, wherein the emergency release mechanism (140) has an adapter housing (150) in which a coupling part (141) pretensioned into a neutral position with a spring element (142) and a force-transmission element connected to the emergency release actuation device and the coupling part (141) are accommodated, wherein the adapter housing (150) can be secured to a housing cover (130) of the cylinder housing (120), wherein the housing cover (130) of the cylinder housing (120) has a cylindrical (131) receiving means (131) with a safety catch (190) projecting into same, into which a cylindrical part (151) of the adapter housing (150) can be inserted and same can be blocked on the housing cover (130) of the cylindrical housing (120) via a rotational movement about an axis of rotation (D5) of the cylindrical part (151) of the adapter housing (150), in which a bayonet attachment (180) arranged on the adapter housing (150) engages behind the safety catch.

Description

[0001] DESCRIPTION

[0002] Spring brake cylinder

[0003] The present invention relates to a spring brake cylinder for a brake of a rail vehicle according to the preamble of claim 1.

[0004] Such spring-loaded brake cylinders are used primarily in the bogies of rail vehicles as a component of a parking brake. Such a spring-loaded brake cylinder has a spring-loaded piston that can be moved axially within the cylinder housing. This piston is moved, on the one hand, by a spring-loaded piston to actuate the brake in the event of a pressure drop, and, on the other hand, by a pressurizable spring-loaded pressure chamber to release the brake. A piston rod that actuates the brake caliper is axially movable with the spring-loaded piston.

[0005] Such a spring-loaded brake cylinder typically also features a manually operable, mechanical emergency release device, which is used when a brake caliper braked by a spring-loaded brake cylinder needs to be released when compressed air is not available as an energy source. Such emergency release devices are controlled, for example, via a Bowden cable.

[0006] Such an emergency release device usually consists essentially of an emergency release actuating device, with which, for example, a Bowden cable is manually actuated, and an emergency release mechanism which can be actuated by the emergency release actuating device and which is attached to the cylinder housing of the spring brake cylinder.

[0007] The attachment of such an emergency release mechanism and the replacement of a Bowden cable fixed therein require access to the emergency release mechanism from at least two sides. On one side, a Bowden cable housing must be attached to the emergency release mechanism, and on the opposite side of the emergency release mechanism, the Bowden cable itself must be connected to a coupling part that actuates a mechanism for decoupling the spring-loaded piston from the piston rod. Such access from multiple sides is often difficult to achieve and, in particular, may require the disassembly of other components of the brake or bogie.

[0008] The object of the present invention is to further develop a spring brake cylinder so that the assembly and maintenance of the emergency release device can be carried out in a simpler manner.

[0009] The stated object is achieved by a spring brake cylinder for a brake of a rail vehicle having the features of claim 1.

[0010] The spring brake cylinder according to the invention has a cylinder housing, a spring-loaded piston which is axially movable within the cylinder housing and which is movable on the one hand by a storage spring for actuating the brake in the event of a pressure drop and on the other hand by a spring-loaded pressure chamber which can be pressurized with pressurized medium for releasing the brake.

[0011] The spring-loaded piston allows a piston rod to move axially. The spring-loaded brake cylinder also features an emergency release device for manually releasing the brake without pressure fluid.

[0012] The emergency release device has an emergency release actuating device and an emergency release mechanism that can be actuated by this.

[0013] The emergency release mechanism has an adapter housing in which a coupling part preloaded into a neutral position by a spring element and a force transmission member connected to the emergency release actuating device and the coupling part are accommodated.

[0014] The adapter housing can be attached to a housing cover of the cylinder housing.

[0015] The housing cover of the cylinder housing has a cylindrical receptacle with a protruding locking pawl. A cylindrical part of the adapter housing can be inserted into the cylindrical receptacle. A bayonet attachment is arranged on one end of the coupling part in the adapter housing. The adapter housing can thus be locked to the housing cover of the cylinder housing by rotating it around a rotational axis of the cylindrical part of the adapter housing by engaging behind the locking pawl with the bayonet attachment of the coupling part.

[0016] With such a designed housing cover of the cylinder housing and a corresponding adapter housing of the emergency release mechanism, assembly and maintenance are made easy because the spring brake cylinder and the emergency release device can be quickly attached and separated.

[0017] In particular, by fixing the adapter housing via the bayonet connection of the coupling part, the adapter housing can be pushed into the housing cover from a first side and locked by turning on the housing cover, so that accessibility from the side of the housing cover opposite the first side is not necessary.

[0018] Advantageous embodiments of the invention are the subject of the subclaims.

[0019] According to an advantageous embodiment, the force transmission element is designed as a Bowden cable.

[0020] According to a further preferred embodiment, a Bowden cable housing enclosing the Bowden cable outside the adapter housing is fastened to the adapter housing by means of a locking plate, wherein the locking plate is detachably fastened to a cover of the adapter housing mounted remotely from the bayonet attachment.

[0021] Such a locking plate also enables easy assembly and maintenance because the emergency release mechanism and the emergency release actuation device can be quickly attached and separated.

[0022] According to an advantageous development, the locking plate is fastened to the cover of the adapter housing by means of a screw that can be passed through a hole in the locking plate. The hole is positioned such that, after loosening the screw, the locking plate can be pivoted about a screw neck serving as a pivot axis from its position securing the Bowden cable housing into a release position. This allows the screw holding the locking plate to be unscrewed from the cover rather than completely unscrewed, and thus the locking plate does not have to be completely removed either. This has the advantage that the individual fixing components do not have to be completely removed, but rather remain on the adapter housing, virtually secured against loss.

[0023] The screws themselves are also preferably secured to the respective component in a captive manner. For this purpose, one screw shaft of each screw is preferably provided with an undercut.

[0024] According to a further advantageous embodiment, the cover of the adapter housing has at least one further receptacle for securing a further Bowden cable and a Bowden cable housing.

[0025] This also makes it easy to use multiple Bowden cable connections on such an emergency release device.

[0026] Preferred embodiments are explained in more detail below with reference to the accompanying drawings.

[0027] They show:

[0028] Fig. 1 is a schematic representation of a generic spring brake cylinder according to the prior art,

[0029] Fig. 2 is a plan view of a housing cover of a cylinder housing with an emergency release actuating device attached thereto according to the prior art,

[0030] Fig. 3 is a schematic isometric view of an embodiment of a spring brake cylinder according to the invention with cylinder housing, housing cover and attached adapter housing of an emergency release mechanism,

[0031] Fig. 4 is an isometric view of the emergency release mechanism with the bayonet attachment attached, Fig. 5 is an isometric view of an adapter housing inserted into a recess in the housing cover before rotational fixation,

[0032] Fig. 6 is a view corresponding to Fig. 5 after rotational fixing of the adapter housing to the housing cover,

[0033] Fig. 7 a side view of the adapter housing with Bowden cable housings arranged on it with the locking cover released and

[0034] Fig. 8 is a sectional view through the adapter housing shown in Fig. 7 from a rotated perspective to show the coupling part and the spring element and the connection of the Bowden cable in the emergency release mechanism.

[0035] In the following description of the figures, terms such as top, bottom, left, right, front, rear, etc., refer exclusively to the exemplary representation and position of the spring brake cylinder, housing cover, adapter housing, Bowden cable, and the like chosen in the respective figures. These terms are not to be understood as limiting; i.e., these references may change due to different operating positions or the mirror-symmetrical design, etc.

[0036] In Figure 1, the reference numeral 2 denotes a generic spring brake cylinder for a brake of a rail vehicle. Such a spring brake cylinder 2 essentially consists of a cylinder housing 4 in which a spring-loaded piston 6 is arranged so as to be axially displaceable. Two spring-loaded springs 14, 16 are arranged between the spring-loaded piston 6 and a cover 10 closing one axial end of the cylinder housing 4. Furthermore, a spring-loaded pressure chamber 18 is formed between the spring-loaded piston 6 and the cylinder housing 4, which can be pressurized with compressed air via an air connection in a casing of the cylinder housing 4.

[0037] The force of these accumulator springs 14, 16 acts via the cover 10 on the spring-loaded piston 6. A piston rod 24 is axially coupled to the spring-loaded piston 6. In the non-emergency-released operating state, the piston rod 24 moves with the spring-loaded piston 6 and, when the accumulator springs 14, 16 are relaxed, presses the piston rod 24 against a brake caliper (not shown here). To release the brake, compressed air is blown into the spring-loaded pressure chamber 18 via the air connection in the cylinder housing 4, which causes the spring-loaded piston 6 to move against the force of the accumulator springs 14, 16 and, with them, the piston rod 24 into a non-braking position.

[0038] To enable the brake to be released even without compressed air, an emergency release device 310 is attached to the cylinder housing 4, as shown in Figure 2. The emergency release device 310 can be actuated with an emergency release actuator. The emergency release mechanism is located in the area of ​​the housing cover 10 of the cylinder housing 4.

[0039] For installation or maintenance, the emergency release mechanism must be mounted from two sides, namely from a first side with a screw 3401 and also from a second side to which the end of the Bowden cable is fixed with another screw 3402.

[0040] For installation or maintenance, the emergency release actuating device must also be secured from two sides, namely from a first side with screw 3403 and from a second side where the end of the Bowden cable is fixed with screw 339.

[0041] In a spring brake cylinder 100 according to the invention, as shown by way of example in Figure 3, the emergency release mechanism 140 can also be fixed to a housing cover 130 of a cylinder housing 120.

[0042] This emergency release mechanism 140 has, as shown in particular in Figure 4, an adapter housing 150 in which a coupling part 141 preloaded into a neutral position by a spring element 142 and a force transmission member connected to the emergency release actuating device and the coupling part 141 are accommodated.

[0043] The power transmission element is designed as a Bowden cable 160.

[0044] For easy attachment of the emergency release mechanism 140 to the cylinder housing 120 of the spring brake cylinder 100, the housing cover 130 of the cylinder housing 120 has a cylindrical receptacle 131 with a locking pawl 190 projecting into it, into which a cylindrical part 151 of the adapter housing 150 can be inserted.

[0045] As shown in Figures 5 and 6, a bayonet attachment 180 arranged on the coupling part 141 engages behind the pawl 190 by a rotational movement of the adapter housing 150 about a rotation axis Ds of the cylindrical part 151 of the adapter housing 150 and thus enables a simple locking of the adapter housing 150 on the housing cover 130 of the cylinder housing 120. Figure 5 shows the adapter housing 150 before the rotational movement and Figure 6 shows the adapter housing 150 after the rotational movement.

[0046] In this way, the adapter housing 150 can be easily fixed to the housing cover 130 of the cylinder housing 120 by inserting it into the housing cover 130 of the cylinder housing 120 from one side of the housing cover 130 of the cylinder housing 120 and then rotating it on the housing cover 130, without requiring access to a side opposite the receptacle 131 in the housing cover 130.

[0047] When assembling the Bowden cable 160 with the emergency release mechanism 140 for coupling to the emergency release actuation device, as can be seen in particular from Figure 8, before mounting the bayonet attachment 180, an end piece 161 of the Bowden cable 160 with a thickened diameter is inserted into a recess provided for this purpose in the coupling part 141 of the emergency release mechanism 140.

[0048] A screw 113, with which the bayonet attachment 180 is fixed to the coupling part 141 of the emergency release mechanism 140, simultaneously locks the end piece 161 of the Bowden cable 160 to the coupling part 141 of the emergency release mechanism 140. As can be further seen from Figure 8, the shaft of the screw 113 is preferably undercut and is thus held in the bayonet attachment 180 in a virtually captive manner.

[0049] To fix a Bowden cable housing 110 to the adapter housing 150, the Bowden cable housing 110 enclosing the Bowden cable 160 is attached to the adapter housing 150 by means of a locking plate 170. The locking plate 170 is releasably attached to a cover 152 mounted on the adapter housing 150 remote from the bayonet attachment 180. As shown in Figure 7, the locking plate 170 is attached to the cover 152 of the adapter housing 150 by means of a screw 111 that can be passed through a bore 171 in the locking plate 170.

[0050] The bore 171 is positioned such that, after loosening the screw 111, the cover 152 can be pivoted about a screw neck of the screw 111, which serves as a rotation axis, from its position securing the Bowden cable housing 110 into a release position. Preferably, the shaft of the screw 111 is also undercut and thus held in the cover 152 in a virtually captive manner.

[0051] As further shown in Figures 3 to 7, the cover 152 of the adapter housing 150 has a further receptacle for securing another Bowden cable with a Bowden cable housing 112.

[0052] As can be further seen in Figures 3 and 4, a screw 114, which extends through the cover 152 and a portion of the Bowden cable housing 110, serves to prevent the adapter housing 150 from being accidentally unscrewed from the closed position of the bayonet lock formed by the bayonet attachment 180 and the locking pawl 190. Preferably, the shaft of the screw 114 is also undercut and thus held in the adapter housing 150 in a virtually captive manner.

[0053] List of reference symbols

[0054] 2 spring brake cylinders

[0055] 4 cylinder housings

[0056] 6 spring-loaded pistons

[0057] 10 housing cover

[0058] 14, 16 storage spring

[0059] 18 spring-loaded pressure chamber

[0060] 24 Piston rod

[0061] 100 spring brake cylinders

[0062] 110, 112 Bowden cable housing

[0063] 111 Screw

[0064] 113, 114 screw

[0065] 120 cylinder housing

[0066] 130 housing cover

[0067] 131 recording

[0068] 140 Emergency release mechanism

[0069] 141 Coupling part

[0070] 142 spring element

[0071] 150 adapter housings

[0072] 151 cylindrical part

[0073] 152 lids

[0074] 160 Bowden cable

[0075] 161 end piece

[0076] 170 locking plate

[0077] 180 bayonet attachment

[0078] 190 Pawl x, y, z direction

[0079] Ds axis of rotation of the cylindrical part

Claims

Claims Spring brake cylinder (100) for a brake of a rail vehicle, comprising - a cylinder housing (120), - a spring-loaded piston (6) which is axially movable within the cylinder housing (120) and which is movable on the one hand by a storage spring (14, 16) for actuating the brake in the event of a pressure drop and on the other hand by a spring-loaded pressure chamber (18) which can be pressurised to release the brake, - a piston rod (24) axially movable with the spring-loaded piston (6), - an emergency release device for manually unlocking the brake without pressure medium, - wherein the emergency release device comprises an emergency release actuating device and an emergency release mechanism (140) actuable thereby, - wherein the emergency release mechanism (140) comprises an adapter housing (150) in which a coupling part (141) preloaded into a neutral position by a spring element (142) and a force transmission member connected to the emergency release actuating device and the coupling part (141) are accommodated, - wherein the adapter housing (150) can be fixed to a housing cover (130) of the cylinder housing (120), characterized in that - the housing cover (130) of the cylinder housing (120) has a cylindrical receptacle (131) with a locking pawl (190) projecting into the receptacle, into which a cylindrical part (151) of the adapter housing (150) can be inserted and locked on the housing cover (130) of the cylinder housing (120) by a rotational movement about a rotational axis (Ds) of the cylindrical part (151) of the adapter housing (150), during which a bayonet attachment (180) arranged on the coupling part (141) engages behind the locking pawl (190). Spring-loaded brake cylinder (100) according to claim 1, characterized in that the force transmission member is designed as a Bowden cable (160). Spring brake cylinder (100) according to claim 2, characterized in that a Bowden cable housing (110) enclosing the Bowden cable (160) outside the adapter housing (150) is fastened to the adapter housing (150) by means of a locking plate (170) detachably fastened to a cover (152) of the adapter housing (150) mounted remotely from the bayonet attachment (180). Spring brake cylinder (100) according to claim 3, characterized in that the locking plate (170) is fastened to the cover (152) of the adapter housing (150) by means of a screw (111) which can be passed through a bore (171) in the locking plate (170), wherein the bore (171) is positioned such that the locking plate (170) can be releasably secured to the cover (152) of the adapter housing (150) after loosening the screw. (111) is pivotable about a screw neck of the screw (111) serving as a rotational axis from its position securing the Bowden cable housing (110) into a release position. Spring-loaded brake cylinder (100) according to claim 4, characterized in that the screw (111) is held captively on the locking plate (170). Spring-loaded brake cylinder (100) according to one of the preceding claims, characterized in that the cover (152) of the adapter housing (150) has at least one further receptacle for securing a further Bowden cable and a Bowden cable housing (112). Spring brake cylinder (100) according to one of the preceding claims, characterized in that the bayonet attachment (180) can be fixed to the coupling part (141) with a screw (113), wherein the screw (113) projects into a region of the coupling part (141) and fixes an end piece (161) of the Bowden cable (160) in a receptacle in the coupling part (141).Spring brake cylinder (100) according to claim 7, characterized in that the screw (113) is held captively on the bayonet attachment (180). Spring brake cylinder (100) according to one of the preceding claims, characterized in that a screw (114) extending through the cover (152) of the adapter housing (150) and a portion of the Bowden cable housing (110) is held captively in the adapter housing (150). Spring brake cylinder (100) according to one of claims 5, 8, or 9, characterized in that a screw shaft of the screw (111, 113, 114) has an undercut.

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