Pressure damper device for a vehicle brake system

Abstract

The invention relates to a pressure damper device (10) for a vehicle brake system, having a first space (20) to which a hydraulic pressure can be applied, and a second space (24) which is surrounded by a damper housing (14) and in which a compressible medium is present, and a separating element (22) for separating the first space (20) from the second space (24). Here, a support element (44) is provided which is annular with respect to a longitudinal axis (48) and by means of which the separating element (22) is pressed against the damper housing (14) obliquely with respect to the longitudinal axis (48), radially outwardly and axially in the direction of the second space (24).

Description

Technical Field

[0001] The present invention relates to a pressure damping device for a vehicle braking system, comprising: a first space to which hydraulic pressure can be applied; a second space surrounded by a damper housing and in which a compressible medium is present; and a separating element for separating the first space from the second space. Background Technology

[0002] Braking systems, especially hydraulic braking systems, are used to reduce the speed of vehicles (e.g., passenger cars and trucks). Various dynamic effects occur during the operation of such braking systems, particularly pressure fluctuations in the lines and spaces within the braking system, which cause vibrations or pulsations, and consequently, undesirable noise and vibration. To minimize these vibrations or to dampen them, pressure damping devices, hereinafter also referred to as dampers, are used at one or more mounting locations within the braking system. These dampers include a first space in which hydraulic pressure can be applied. This space is a type of container containing a hydraulic fluid, particularly braking fluid, under pressure. Here, pressure is generated by forces acting on surfaces.

[0003] A damper with a separating element is known, which divides a space into a first space containing a liquid or fluid and a second space containing a compressible medium, typically in the form of a gas. It is well known that when an increased pressure is applied to the container from the outside, the volume of the deformable container containing the gas decreases. Similarly, when hydraulic pressure is applied to the first space, the volume of the second space also decreases by means of the separating element.

[0004] If the pressure decreases again, the volume of the gas, and therefore the volume of the second space, increases accordingly. This second space acts like a pneumatic spring, and is also called a gas spring. The damping of the gas spring depends on the volume of gas in the second space. The larger the gas volume, the softer the damping. Summary of the Invention

[0005] The object of the present invention is to provide a device for damping vibrations in a braking system, which can be manufactured particularly cost-effectively.

[0006] According to the present invention, a pressure damping device for a vehicle braking system is provided, comprising: a first space to which hydraulic pressure can be applied; a second space surrounded by a damper housing, and in which a compressible medium is present; and a separating element for separating the first space and the second space. Here, according to the present invention, a support element annular relative to a longitudinal axis is provided, by means of which the separating element is pressed against the damper housing in a direction that is radially outward and axially toward the second space, inclined relative to the longitudinal axis.

[0007] The solution according to the invention achieves a seal between the damper housing and the partition element solely based on axially pressing the partition element against the damper housing. Here, the pressing is axially and obliquely radially outward, thereby forming a particularly fluid-impermeable seal. The seal is further reinforced by the pressure load generated at this time, acting radially from the inside on the hydraulic fluid entering the second space.

[0008] In an advantageous improvement to the solution according to the invention, a device housing is provided at the pressure damping device of the vehicle braking system, and a damper housing is mounted in this device housing, wherein the annular support element is designed integrally with the device housing. Therefore, the number of components can be advantageously kept to a very small number.

[0009] The separating element is preferably designed as a cup-shaped membrane with an annular sealing strip area on one end. The sealing strip area advantageously has an axially enlarged dimension relative to the remaining hollow cylindrical membrane wall. When pressure is applied using a support element, this increased size causes compression of the sealing strip or the area of ​​the sealing strip.

[0010] Here, the annular sealing strip area is advantageously designed with a first clamping surface pointing toward the damper housing and oriented largely radially, and a second clamping surface pointing toward the support element and also oriented largely radially. This creates two clamping surfaces or areas in which the materials of adjacent components overlap during assembly, thereby generating targeted compression of the components in the assembled state.

[0011] Here, the annular support element is preferably designed with a support surface that is radially and axially inclined toward the separating element. The inclined support surface is advantageously designed as a tapered surface. Therefore, a uniformly acting clamping force is generated throughout the entire circumference of the annular support element. The material of the separating element is pushed outward, especially radially, by means of the support surface.

[0012] The annular support element is also advantageously designed to have at least one channel extending radially from the interior to the exterior. This at least one channel ensures pressure balance between the inner radial side and the outer radial side of the support element. This achieves pressure balance both radially and externally within the first space, where the separating element is pressed against the surrounding housing as if pushed by the support element radially inward. Therefore, the pressure acting beneath the gap between the support element and the surrounding housing cannot disrupt the seal formed by the sealing strip area. Material from the sealing strip area also cannot migrate into the gap. The gap and the associated pressure balance simultaneously prevent slack pressure, meaning that there are no areas of locally high pressure that remain locked for a short time before decreasing in pressure with a time delay. The at least one channel is preferably designed as a radial channel opening or an axial channel groove.

[0013] According to the invention, the damper housing is preferably designed with an end-side annular surface that is radially and axially inclined, by means of which the separating element is obliquely pushed outward. Thus, the end-side annular surface forms a mating support for obliquely pushing the separating element axially and radially toward the damper housing according to the invention.

[0014] Here, the damper housing is designed in a cup shape, and thus completely surrounds the separator element on the outside, while providing a large movable membrane surface for the same cup-shaped separator element in a particularly small structural space.

[0015] An alternative solution integrating the device housing, with support elements specifically designed as deep-drawn sheet metal parts at a cost-effective advantage.

[0016] In an advantageous improvement to the solution according to the invention, a damper housing is also installed within the device housing, and is hereby secured in a fixed position, particularly by means of a locking part (Verstemmung). Thus, the separating element according to the invention can be pressed onto the damper housing in a single step, wherein the associated seal according to the invention is achieved, and simultaneously the damper housing is fixedly introduced into the device housing.

[0017] Accordingly, the solution according to the invention also relates to a method for manufacturing a pressure damping device for a vehicle braking system, wherein a separating element is installed into a damper housing, and then the assembly is placed into a device housing and fixed in place by means of a locking part, wherein the separating element is simultaneously pushed radially outward and axially toward the damper housing by an annular and particularly conical or truncated conical support element located in the device housing at an angle relative to the longitudinal axis. Attached Figure Description

[0018] Embodiments of the solution according to the present invention are further illustrated below with reference to the schematic accompanying drawings. Wherein:

[0019] Figure 1 A longitudinal section of a pressure damping device for a vehicle braking system according to the prior art is shown.

[0020] Figure 2 A longitudinal section of a first embodiment of a pressure damping device for a vehicle braking system according to the present invention is shown.

[0021] Figure 3 Shown in magnified view according to Figure 2 Detail III; and

[0022] Figure 4 It shows according to Figure 2 A portion of the illustration shows a second embodiment of the pressure damping device for a vehicle braking system according to the present invention. Detailed Implementation

[0023] exist Figure 1 The diagram shows a pressure damping device 10 for a vehicle braking system, comprising a device housing 12 and a damper housing 14. A delivery line 16 is arranged within the device housing 12, to which hydraulic pressure can be applied in the direction of arrow 18 by means of (not shown) hydraulic fluid, in this case brake fluid. The delivery line 16 leads into a first space 20, which is defined relative to a cup-shaped membrane-like separator element 22. Looking from the first space 20, behind the separator element 22 is a second space 24, which is externally defined by the damper housing 14. Thus, the first space 20 is surrounded by the device housing inner side 26 of the device housing 12 and the separator element inner side 28 of the separator element 22. The second space 24 is surrounded by the damper housing inner side 30 of the damper housing 14 and the separator element outer side 32 of the separator element 22. The separator element 22 is designed in the shape of a cup-shaped membrane and has an end region 34 that is open towards the delivery line 16. At this end region 34, the separator element 22 is sealed relative to the damper housing 14 by means of a sealing portion 36. The sealing portion 36 is formed by a stepped metal ring 38, on which the separator element 22 is formed by vulcanization, and the stepped metal ring itself is designed at the damper housing 14 by a metal sealing connection with a very precise geometry.

[0024] The separator element 22 is designed with a surrounding, semi-circular groove 40 on its outer side 32.

[0025] exist Figure 2 and Figure 3The diagram shows a pressure damping device 10 for a vehicle braking system, which also has a generally square device housing 12, a cup-shaped damper housing 14, a delivery line 16, a first space 20, a similarly cup-shaped separating element 22, and a second space 24. These components are designed similarly to those described in [the diagram]. Figure 1 The case of the pressure damping device 10 in the vehicle braking system. However, according to Figure 2 and Figure 3 In the pressure damping device 10 of the vehicle braking system, the seal between the damper housing 14 and the separator element 22 is designed differently. For this purpose, an annular, axially and radially thickened sealing strip region 42 is constructed at the end side of the separator element 22, and an annular support element 44, in the form of a deep-drawn sheet metal, is arranged at the end side of this sealing strip region. The separator element 22 is pressed against the damper housing 14 at its open end side 46, inclined radially outward and axially toward the second space 24 relative to its longitudinal axis 48, by means of the support element 44 (see arrows 50 and 52). The required pressure is generated by installing the support element 44 in a stepped hole 54 in the device housing 12, with a delivery line 16 installed at the center of this stepped hole, and then fixing the damper housing 14 and the separator element 22 disposed inside it into the stepped hole via an outer locking part 56.

[0026] Here, the support element 44 has a tapered or frustoconical support surface 58 pointing toward the separating element 22, which is inclined relative to the longitudinal axis 48 at an angle between 30° and 60°, particularly between 40° and 50°. Furthermore, the support element 44 has a radially outer circumferential surface 60 on which a plurality of circular channels 62 are regularly distributed in a circumferential direction. The channels 62 serve to balance the pressure between the inner and outer sides of the support element 44.

[0027] The annular sealing strip region 42 of the separator element 22 is designed to have a first pressing surface 64, which is largely radially oriented and points toward the damper housing 14, and a second pressing surface 66, which is radially and axially inclined and points toward the support element 44. Furthermore, the damper housing 14 is designed to have an end-side annular surface 68, against which the separator element 22 presses its pressing surface 64 axially.

[0028] like Figure 3 As shown, at the partition element 22 thus pressed against the damper housing 14, two regions 70 with zero fluid pressure are obtained on the one hand, and two regions 72 with maximum fluid pressure are also obtained on the other. Therefore, this partition element 22 seals the damper housing 14 particularly in the axial direction, and fluidly seals the device housing 12 in the radial direction in a particularly advantageous manner.

[0029] exist Figure 4 The image shows one embodiment of a pressure damping device 10 for a vehicle braking system, in which an annular support element 44 is integrally formed with the device housing 12. For this purpose, a stepped hole 54 is configured such that a support surface 58, pointing towards the separating element 22 and inclined radially and axially, is simultaneously obtained at the stepped portion of the hole.

[0030] In addition, according to Figure 4 In this embodiment, at the damper housing 14, the annular surface 69 on its end side is designed to be radially and axially inclined, thereby the separating element 22 is obliquely pushed outward radially.

Claims

1. Pressure damper device (10) of a vehicle brake system, having a first space (20) to which a hydraulic pressure can be applied, a second space (24) which is surrounded by a damper housing (14) and in which a compressible medium is present, and a separating element (22) for separating the first space (20) from the second space (24), provided with a ring-shaped support element (44) which is symmetrical with respect to a longitudinal axis (48) and which is designed to have a support face (58) which is inclined radially and axially from an end of the radially outer circumferential face (60) facing the separating element (22) towards the separating element (22), and by means of which the separating element (22) is pressed against the damper housing (14) obliquely with respect to the longitudinal axis (48), radially outwards and axially towards the second space (24). characterized in that provided with a device housing (12) into which the damper housing (14) is mounted.

2. The pressure damping device of a vehicle brake system according to claim 1, characterized by The separating element (22) is designed as a cup-shaped membrane which has an end-side ring-shaped sealing strip region (42).

3. The pressure damping device of a vehicle brake system according to claim 1, characterized by The separating element (22) is designed as a cup-shaped membrane which has an end-side ring-shaped sealing strip region (42).

4. The pressure damping device of a vehicle brake system according to claim 2, characterized by The ring-shaped sealing strip region (42) is designed to have a first pressing face (64) which is directed towards the damper housing (14) and is oriented radially, and a second pressing face (66) which is directed towards the support element (44) and is likewise oriented radially.

5. The pressure damping device of a vehicle brake system according to any one of claims 1 to 4, characterized in that, The ring-shaped support element (44) is designed to have at least one passage (62) from a radially inner portion towards a radially outer portion.

6. The pressure damping device of a vehicle brake system according to any one of claims 1 to 4, characterized in that, The damper housing (14) is designed to have an end-side, radially and axially inclined annular face (68) by means of which the separating element (22) is pressed obliquely radially outwards.

7. The pressure damping device of a vehicle brake system according to any one of claims 1 to 4, characterized in that, The damper housing (14) is cup-shaped.

8. The pressure damping device of a vehicle brake system according to any one of claims 1 to 4, characterized by The ring-shaped support element (44) is a sheet deep-drawing.

9. The pressure damping device of a vehicle brake system according to any one of claims 1 to 4, characterized in that, The separating element is mounted into the damper housing (14), the assembly comprising the separating element and the damper housing (14) is placed into the device housing (12) and is fixed positionally there by means of a locking portion (56), wherein at the same time the separating element (22) is pressed by the ring-shaped support element (44) located in the device housing (12) obliquely with respect to the longitudinal axis (48), radially outwards and axially towards the damper housing (14).

10. Method for manufacturing a pressure damper device (10) of a vehicle brake system according to any one of claims 1 to 9, wherein ​

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