Valve unit for modulating pressure in a compressed-air brake system
A valve unit for modulating pressure in a compressed-air brake system comprises an inlet valve ( 6 ) and an outlet valve ( 7 ) configured as diaphragm valves, a brake pressure output ( 4 ) configured to be connected to or shut off from a brake pressure input ( 3 ) or a vent output ( 5 ), two pilot valves ( 8, 9 ) configured as 3/2-way solenoid valves, and a respective control chamber ( 31, 32 ) adjacent to the diaphragm ( 17, 18 ) of the diaphragm valves ( 6, 7 ). The diaphragms ( 17, 18 ) are each clamped between two housing parts ( 11, 14; 11′, 14′ ) via a respective ring bead ( 22, 23 ) placed in a housing-side ring groove ( 20, 21; 20′, 21′ ). In order to avoid damaging the diaphragms ( 17, 18 ), an annular continuous or partially interrupted recess ( 54 ) is arranged in the ring groove ( 20, 21 ) or immediately adjacent to the ring groove to receive displaced bead material from the diaphragm ( 17 ).
1. A valve unit for modulating pressure in a compressed-air brake system, the valve unit comprising:
an inlet valve ( 6 ) and an outlet valve ( 7 ), the inlet valve and the outlet valve being configured as diaphragm valves, each of the diaphragm valves having a diaphragm ( 17 , 18 ),
a brake pressure output ( 4 ) configured to be connected to or shut off from a brake pressure input ( 3 ) or a vent output ( 5 ),
two pilot valves ( 8 , 9 ) configured as 3/2-way solenoid valves,
a respective control chamber ( 31 , 32 ) adjacent to the diaphragm ( 17 , 18 ) of each of the diaphragm valves ( 6 , 7 ), the control chamber ( 31 , 32 ) being configured to be pressurized with a control pressure via a control pressure line ( 33 , 34 ),
wherein the diaphragm valves ( 6 , 7 ) are arranged with parallel actuation axes ( 15 , 16 ) and radially adjacent to each other in a valve housing ( 2 ), and the diaphragms ( 17 , 18 ) of the diaphragm valves ( 6 , 7 ) are each clamped between two housing parts ( 11 , 14 ; 11 ′, 14 ′) via a respective ring bead ( 22 , 23 ) placed in a housing-side ring groove ( 20 , 21 ; 20 ′, 21 ′) and oriented axially on a pilot valve side,
wherein an annular continuous recess ( 54 , 60 , 64 , 67 , 71 , 71 ′) or a partially interrupted recess is arranged in the ring groove ( 20 , 21 ; 20 ′, 21 ) or immediately adjacent to the ring groove ( 20 , 21 ; 20 ′, 21 ′) of at least one of the diaphragm valves ( 6 , 7 ) to receive displaced bead material from the diaphragm ( 17 , 18 ),
wherein at least one of a radially outer side wall ( 43 ″) and a radially inner side wall ( 45 ″) of the ring groove ( 20 ″) is configured with an oversize or undersize and with axial webs ( 55 , 56 ) evenly distributed circumferentially and protruding radially into the ring groove ( 20 ″) to form the partially interrupted recess ( 57 , 58 ).
2. The valve unit as claimed in claim 1 , wherein a radially outer side wall ( 43 ′) of the ring groove ( 20 ) is chamfered radially outwardly towards a separating plane ( 10 ) of the adjacent housing parts ( 11 , 14 ) to form the annular continuous recess ( 54 ).
3. The valve unit as claimed in claim 2 , wherein the housing part ( 11 ′) facing away from the pilot valves ( 8 , 9 ) has an edge groove ( 61 ) with a single step, the edge groove ( 61 ) having a radially inner groove portion ( 62 ) holding a supporting disk ( 42 ) for the diaphragm ( 17 ′), and the edge groove ( 61 ) having a radially outer groove portion ( 63 ) radially surrounding the housing part ( 14 *) on the pilot valve side close to the ring groove ( 20 *) and enclosing an additional annular continuous recess ( 64 ).
4. The valve unit as claimed in claim 1 , wherein the axial webs ( 55 , 56 ) are arranged on radially opposite sides of the ring groove ( 20 ″) and-circumferentially offset on the radially outer side wall ( 43 ″) with respect to the axial webs ( 55 , 56 ) on the radially inner side wall ( 45 ″) of the ring groove ( 20 ″).
5. The valve unit as claimed in claim 1 , wherein the housing part ( 14 ) on the pilot valve side and adjacent to the radially inner side wall ( 45 ″) of the ring groove ( 20 ″) includes an annular clamping web ( 59 ) rising axially towards the ring groove ( 20 ″) and wedge-shaped in cross-section.
6. A valve unit for modulating pressure in a compressed-air brake system, the valve unit comprising:
an inlet valve ( 6 ) and an outlet valve ( 7 ), the inlet valve and the outlet valve being configured as diaphragm valves, each of the diaphragm valves having a diaphragm ( 17 , 18 ),
a brake pressure output ( 4 ) configured to be connected to or shut off from a brake pressure input ( 3 ) or a vent output ( 5 ),
two pilot valves ( 8 , 9 ) configured as 3/2-way solenoid valves,
a respective control chamber ( 31 , 32 ) adjacent to the diaphragm ( 17 , 18 ) of each of the diaphragm valves ( 6 , 7 ), the control chamber ( 31 , 32 ) being configured to be pressurized with a control pressure via a control pressure line ( 33 , 34 ),
wherein the diaphragm valves ( 6 , 7 ) are arranged with parallel actuation axes ( 15 , 16 ) and radially adjacent to each other in a valve housing ( 2 ), and the diaphragms ( 17 , 18 ) of the diaphragm valves ( 6 , 7 ) are each clamped between two housing parts ( 11 , 14 ; 11 ′, 14 ′) via a respective ring bead ( 22 , 23 ) placed in a housing-side ring groove ( 20 , 21 ; 20 ′, 21 ′) and oriented axially on a pilot valve side,
wherein an annular continuous recess ( 54 , 60 , 64 , 67 , 71 , 71 ′) or a partially interrupted recess is arranged in the ring groove ( 20 , 21 ; 20 ′, 21 ) or immediately adjacent to the ring groove ( 20 , 21 ; 20 ′, 21 ′) of at least one of the diaphragm valves ( 6 , 7 ) to receive displaced bead material from the diaphragm ( 17 , 18 ),
wherein radial side walls ( 43 *, 45 *) of the ring groove ( 20 *) and a groove base ( 44 *) of the ring groove ( 20 *) are arranged in the housing part ( 14 *) on the pilot valve side, wherein the radial side walls ( 43 *, 45 *) of the ring groove ( 20 *) and outer walls of the ring bead ( 22 *) of the diaphragm ( 17 ′) slope axially convergently in a direction of the housing part ( 14 *) on the pilot valve side, and wherein an axial depth of the ring groove ( 20 *) exceeds an axial height of the ring bead ( 22 *) to form the annular continuous recess ( 60 ).
7. The valve unit as claimed in claim 6 , wherein the housing part ( 11 ′) facing away from the pilot valves ( 8 , 9 ) has an edge groove ( 61 ) with a single step, the edge groove ( 61 ) having a radially inner groove portion ( 62 ) holding a supporting disk ( 42 ) for the diaphragm ( 17 ′), and the edge groove ( 61 ) having a radially outer groove portion ( 63 ) radially surrounding the housing part ( 14 *) on the pilot valve side close to the ring groove ( 20 *) and enclosing an additional annular continuous recess ( 64 ).
8. A valve unit for modulating pressure in a compressed-air brake system, the valve unit comprising:
an inlet valve ( 6 ) and an outlet valve ( 7 ), the inlet valve and the outlet valve being configured as diaphragm valves, each of the diaphragm valves having a diaphragm ( 17 , 18 ),
a brake pressure output ( 4 ) configured to be connected to or shut off from a brake pressure input ( 3 ) or a vent output ( 5 ),
two pilot valves ( 8 , 9 ) configured as 3/2-way solenoid valves,
a respective control chamber ( 31 , 32 ) adjacent to the diaphragm ( 17 , 18 ) of each of the diaphragm valves ( 6 , 7 ), the control chamber ( 31 , 32 ) being configured to be pressurized with a control pressure via a control pressure line ( 33 , 34 ),
wherein the diaphragm valves ( 6 , 7 ) are arranged with parallel actuation axes ( 15 , 16 ) and radially adjacent to each other in a valve housing ( 2 ), and the diaphragms ( 17 , 18 ) of the diaphragm valves ( 6 , 7 ) are each clamped between two housing parts ( 11 , 14 ; 11 ′, 14 ′) via a respective ring bead ( 22 , 23 ) placed in a housing-side ring groove ( 20 , 21 ; 20 ′, 21 ′) and oriented axially on a pilot valve side,
wherein an annular continuous recess ( 54 , 60 , 64 , 67 , 71 , 71 ′) or a partially interrupted recess is arranged in the ring groove ( 20 , 21 ; 20 ′, 21 ) or immediately adjacent to the ring groove ( 20 , 21 ; 20 ′, 21 ′) of at least one of the diaphragm valves ( 6 , 7 ) to receive displaced bead material from the diaphragm ( 17 , 18 ),
wherein each housing part ( 11 ′) facing away from the pilot valves ( 8 , 9 ) has a stepped edge groove ( 68 , 74 ), the stepped edge groove ( 68 , 74 ) having a radially inner groove portion ( 69 , 75 ) receiving flushly a supporting disk ( 42 ) for the diaphragm ( 17 ), and the stepped edge groove ( 68 , 74 ) having an adjacent radially outer groove portion ( 70 , 77 ) enclosing the ring bead ( 22 ) of the diaphragm ( 17 ) axially and radially on one side and delimiting the annular continuous recess ( 71 , 71 ′).
9. The valve unit as claimed in claim 8 , wherein the edge groove ( 68 ) has a single step and the annular continuous recess ( 71 ) is formed by a radial groove ( 73 ) arranged in a radial side wall ( 72 ) of the radially outer groove portion ( 70 ) of the edge groove ( 68 ).
10. The valve unit as claimed in claim 8 , wherein the edge groove ( 74 ) has two steps, and the annular continuous recess ( 71 ′) is formed by a cylindrical ring ( 78 ) laid in the radially outer groove portion ( 77 ) of the edge groove ( 74 ), the radially outer groove portion ( 77 ) protruding radially inwardly over a radial side wall ( 79 ) of a middle groove portion ( 76 ) of the edge groove ( 74 ).
11. A valve unit for modulating pressure in a compressed-air brake system, the valve unit comprising:
an inlet valve ( 6 ) and an outlet valve ( 7 ), the inlet valve and the outlet valve being configured as diaphragm valves, each of the diaphragm valves having a diaphragm ( 17 , 18 ),
a brake pressure output ( 4 ) configured to be connected to or shut off from a brake pressure input ( 3 ) or a vent output ( 5 ),
two pilot valves ( 8 , 9 ) configured as 3/2-way solenoid valves,
a respective control chamber ( 31 , 32 ) adjacent to the diaphragm ( 17 , 18 ) of each of the diaphragm valves ( 6 , 7 ), the control chamber ( 31 , 32 ) being configured to be pressurized with a control pressure via a control pressure line ( 33 , 34 ),
wherein the diaphragm valves ( 6 , 7 ) are arranged with parallel actuation axes ( 15 , 16 ) and radially adjacent to each other in a valve housing ( 2 ), and the diaphragms ( 17 , 18 ) of the diaphragm valves ( 6 , 7 ) are each clamped between two housing parts ( 11 , 14 ; 11 ′, 14 ′) via a respective ring bead ( 22 , 23 ) placed in a housing-side ring groove ( 20 , 21 ; 20 ′, 21 ′) and oriented axially on a pilot valve side,
wherein an annular continuous recess ( 54 , 60 , 64 , 67 , 71 , 71 ′) or a partially interrupted recess is arranged in the ring groove ( 20 , 21 ; 20 ′, 21 ) or immediately adjacent to the ring groove ( 20 , 21 ; 20 ′, 21 ′) of at least one of the diaphragm valves ( 6 , 7 ) to receive displaced bead material from the diaphragm ( 17 , 18 ),
wherein each housing part ( 11 ′) facing away from the pilot valves ( 8 , 9 ) has an edge groove ( 61 ′) with a single step, the edge groove ( 61 ′) having a radially inner groove portion ( 62 ′) holding a supporting disk ( 42 ) for the diaphragm ( 17 ), and the edge groove ( 61 ′) having a radially outer groove portion ( 63 ′) surrounding the ring bead ( 22 ) of the diaphragm ( 17 ) axially and radially on one side, the inner groove portion ( 62 ′) having a radial side wall ( 66 ) with a height less than a thickness ( 65 ) of the supporting disk ( 42 ) such that the radially outer groove portion ( 63 ′) delimits the annular continuous recess ( 67 ).