Valve assembly, especially for slip-controlled motor vehicle braking systems

Abstract

Valve assembly, in particular for slip-controlled motor vehicle braking systems, comprising a valve receiving body (13) and a cartridge valve (5) which is fixed in a receiving bore (3) of the valve receiving body (13) and is hydraulically actuated by means of an inlet channel (21) opening into the outer surface (1) of the receiving bore (3), wherein in the opening area of ​​the inlet channel (2) the outer surface (1) has a radially enlarged recess (4) whereby the inner diameter of the receiving bore (3) in the opening area of ​​the inlet bore (2) is at least partially enlarged compared to the nominal diameter of the receiving bore (3), characterized in that a sleeve-shaped centering element (7) is arranged between the cartridge valve (5) and the outer surface (1) which aligns the cartridge valve (5) centrally in the receiving bore (3), wherein the centering element (7) extends vertically into the receiving bore (3). extending centering section (8),the vertical extent of which in the depth of the receiving bore (3) is reduced by the vertical dimension of the recess (4), wherein the centering element (7) is frictionally fixed to the cartridge valve (5), and that the centering section (8) is formed by several skids uniformly distributed over the circumference of the sleeve-shaped centering element (7).

Description

[0001] The invention relates to a valve assembly, in particular for slip-controlled motor vehicle brake systems, according to the preamble of patent claim 1.

[0002] DE 10 2011 076 556 A1 already discloses a valve assembly for a slip-controlled motor vehicle brake system, consisting of a block-shaped valve receiving body and a cartridge valve that is fixed in a receiving bore of the valve receiving body and is hydraulically actuated by means of an inlet channel opening into the outer surface of the receiving bore. The inlet channel opens directly laterally into the area of ​​the receiving bore, which contains a ring filter to protect the cartridge valve from dirt particles in the brake fluid. Furthermore, the lower end section of the ring filter serves as a centering aid when inserting the cartridge valve into the valve receiving body, since the receiving bore has a constant inner diameter. Thus, there is only a small gap between the ring filter and the inlet channel, which proves to be less than optimal in terms of fluid dynamics.

[0003] DE 103 32 345 A1 discloses a valve assembly with a valve receiving body, wherein a cartridge valve is received in a receiving bore of the valve receiving body. A pressure medium channel leads to the receiving bore, wherein the area where the pressure medium channel enters the receiving bore is enlarged compared to a nominal diameter of the pressure medium channel. Other similar valve assemblies are known from DE 101 41 134 A1 and DE 10 2005 034 985 A1.

[0004] It is the object of the present invention to design a valve assembly of the specified type with the simplest and most functional means possible, in a flow-optimized manner, as well as to provide a precise supply and alignment of the cartridge valve in the receiving bore.

[0005] This object is achieved according to the invention with a valve assembly according to the features of patent claim 1.

[0006] Further features and advantages of the invention will become apparent from the following description of several embodiments.

[0007] They show: Fig. 1 an overall view of a valve assembly in longitudinal section, consisting of a cartridge valve inserted into a receiving bore of a valve receiving body, Fig. 2 a cross-section of the valve body in the inlet area of ​​the mounting bore, Fig. 3 a perspective view of the Fig. 1 shown centering element fixed to the cartridge valve, which is additionally provided with a filter function.

[0008] The Fig. Figure 1 shows, in a significantly enlarged view, a valve assembly in longitudinal section, which is preferably used for slip-controlled motor vehicle braking systems. The valve assembly consists of a block-shaped valve receiving body 13 and a cartridge valve 5, which is fixed in a receiving bore 3 of the valve receiving body 13 and is hydraulically actuated by means of an inlet channel 2 opening into the outer surface 1 of the receiving bore 3. The receiving bore 3 is designed as a blind bore, which opens into an outlet channel 14 in its bottom region. The cartridge valve 5, designed as an electromagnetic valve, thus establishes a hydraulic connection between the inlet and outlet channels 2, 14 in the valve receiving body 13, as desired or required.

[0009] In order to achieve the lowest possible hydraulic flow resistance in the inlet area of ​​the cartridge valve 5, the jacket surface 1 has a generously dimensioned recess 4 in the inlet area of ​​the inlet channel 2, so that the inner diameter of the receiving bore 3 in the inlet area of ​​the inlet bore 2 is significantly enlarged, at least in sections, compared to the regular nominal diameter of the receiving bore 3 provided above the recess 3.

[0010] The recess 4, referred to in technical terms as a flycut, is enlarged in the flow direction of the inlet channel 2 to the cartridge valve 5 as desired or required, either only partially or completely over the circumference of the jacket surface 1 in a funnel-shaped, circular ring-shaped or sickle-shaped manner.

[0011] Specifically, the Fig. 1 taking into account the Fig. 2, a crescent-shaped recess 4 is recessed in the outer surface 1 of the receiving bore 3, which thus almost completely surrounds the cartridge valve, so that the pressure medium flow is evenly distributed and supplied over the circumference of the cartridge valve via the inlet channel 2 opening centrally into the crescent-shaped recess 4.

[0012] In terms of manufacturing technology, any shape of the recess 4 described above can be produced as an undercut by inserting a suitable milling cutter down to the bottom of the receiving bore 3. The milling cutter can also be used to Fig. 1, which ensures a smooth transition from the recess 4 to the regular nominal diameter of the receiving bore 3.

[0013] In the Fig. 1 and Fig. In Figure 2, the inlet channel 2 is depicted as an inclined channel opening laterally from below into the receiving bore 3. However, this is only one of several design variants, so that the inlet channel 2 can open laterally into the outer surface 1 of the receiving bore 3 from any other angle without thereby departing from the approach to solving the problem presented at the beginning.

[0014] The recess 4 forms an annular space 6 in the inflow area between the lateral surface 1 of the receiving bore 3 and the cartridge valve 5, which is larger than the nominal diameter of the receiving bore 3 and leads to a reduction in the flow resistance.

[0015] Due to the recess 4 provided for this purpose just before the bottom area of ​​the receiving bore 3, the lack of a guiding and supporting function of the casing surface 1 for the cartridge valve 5 in this area makes it necessary to provide a sleeve-shaped centering element 7, which is pre-mounted on the cartridge valve 5 with a friction fit, between the cartridge valve 5 and the casing surface 1 in order to align the cartridge valve 5 centrally to the receiving bore 3 without tilting during assembly and to guide it precisely in the receiving bore 3 during the insertion process. For this purpose, the centering element 7 has a centering section 8 extending vertically into the receiving bore 3, the vertical extent of which is reduced by the vertical dimension of the recess 4, so that overlapping of the inlet area is ruled out in any case.

[0016] As can be seen from the perspective view Fig.3, the sleeve-shaped centering element 7 consists of two concentrically aligned rings 10 which are connected to one another via a plurality of webs 11 which are uniformly distributed over the circumference of the rings 10 and between which a fine-mesh filter fabric 12 is arranged. The vertical distance between the two rings 10, determined by the length of the four webs 11, corresponds to the immersion depth of the sleeve section of the cartridge valve 5 which is hydraulically actuated in the receiving bore 3, wherein the centering section 8, which is designed on the webs 11 in the form of skids, has a vertical extension within the receiving bore 3 which, starting from the vertical distance between the two rings 10, is reduced by the vertical dimension of the recess 4, so that the aforementioned overlap of the inlet area after final assembly of the cartridge valve 5 in the receiving bore 4 is reliably avoided.In order to ensure the simplest possible insertion of the cartridge valve 5 into the receiving bore 3, each runner is provided with a chamfer 9 in the joining direction.

[0017] According to the present exemplary embodiment, the centering element 7, which is preferably made of a plastic by injection molding, additionally assumes the function of a filter element according to the structure described, which, due to its all-round filter fabric 12, reliably keeps the dirt introduced into the annular space 6 via the inlet channel 2 away from the cartridge valve 5. List of reference symbols 1 lateral surface 2 inlet channel 3 mounting hole 4 recess 5 cartridge valve 6 Annular space 7 Centering element 8 Centering section 9 phase 10 rings 11 bridges 12 filter fabrics 13 Valve body 14 Drain channel 15 Bevel

Claims

[1] Valve assembly, in particular for slip-controlled motor vehicle brake systems, consisting of a valve receiving body (13) and a cartridge valve (5) which is fixed in a receiving bore (3) of the valve receiving body (13) and is hydraulically actuated by means of an inlet channel (21) opening into the outer surface (1) of the receiving bore (3), wherein in the opening region of the inlet channel (2) the outer surface (1) has a radially widened recess (4), whereby the inner width of the receiving bore (3) in the opening region of the inlet bore (2) is at least partially enlarged compared to the nominal diameter of the receiving bore (3), characterized bythat a sleeve-shaped centering element (7) is arranged between the cartridge valve (5) and the outer surface (1), which aligns the cartridge valve (5) centrally in the receiving bore (3), wherein the centering element (7) has a centering section (8) extending vertically into the receiving bore (3), the vertical extent of which is reduced in the depth of the receiving bore (3) by the vertical dimension of the recess (4), wherein the centering element (7) is fixed to the cartridge valve (5) in a frictionally engaged manner, and that the centering section (8) is formed by a plurality of runners distributed uniformly over the circumference of the sleeve-shaped centering element (7). [2] Valve assembly according to claim 1, characterized by that the recess (4) in the flow direction from the inlet channel (2) to the cartridge valve (5) is enlarged either partially or completely over the circumference of the jacket surface (1) in a funnel-shaped, circular or sickle-shaped manner. [3] Valve assembly according to claim 1 or 2, characterized by that the radially expanded recess (4) between the outer surface (1) of the receiving bore (3) and the cartridge valve (5) forms an annular space (6) which is larger than the nominal diameter of the receiving bore (3). [4] Valve assembly according to one of claims 1 to 3, characterized by that each runner is provided with a chamfer (9) to facilitate the insertion of the cartridge valve (5) into the receiving bore (3). [5] Valve assembly according to one of claims 1 to 4, characterized by that the sleeve-shaped centering element (7) consists of two concentrically aligned rings (10) which are connected to one another via a plurality of webs (11) distributed uniformly over the circumference of the rings (10), between which a fine-mesh filter fabric (12) is arranged. [6] Valve assembly according to claim 5, characterized bythat a centering section (8) formed by runners is provided on the webs (11), the vertical extent of which is reduced in the depth of the receiving bore (3) by the vertical dimension of the recess (4). [7] Valve assembly according to one of the preceding claims, characterized by that the centering element (7) is made of a plastic by injection molding.

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