DE102016223745A1 - Connecting element for a brake system and brake system with a connecting element - Google Patents

Abstract

The invention relates to a connecting element (10) for the fluid-conducting connection of a brake line (40) to the brake caliper (50) of the brake system of a motor vehicle, wherein the connecting element (10) has a hollow bolt (11) with an inner channel (16). On the outside of the bolt (11) at least one annular groove (12) is formed, in which a sealing ring (30) is located, and the outer diameter of the bolt (11) is enlarged at one end, thus forming a thickening (13). The bolt (11) has at this thickening (13) a connection point (14) for connecting a brake line (40) to the inner channel (16). The invention further relates to a brake system for a motor vehicle with such a connecting element.

Description

The invention relates to a connecting element for the fluid-conducting connection of a brake line to the caliper of the brake system of a motor vehicle. The invention further relates to a brake system for a motor vehicle with such a connecting element between a brake pipe and a brake caliper.

In vehicle technology, hollow screws are often used in pneumatic or hydraulic systems to connect a hose with another component. In particular, this is known in brake systems of motor vehicles, in which brake lines are connected to brake valves of brake calipers. With such hollow screws, both a mechanical and a fluid-conducting connection can be produced. The hollow screw usually has a bolt-shaped body with a thread. This may be an internal thread, but preferably an external thread is used, with which the bolt can be screwed into a component of a brake system.

The hollow screw also has an inner channel to which a hose with a thread can be screwed. Thus, the hose is mechanically connected to the brake system, and it is particularly known to connect in this way a brake pipe with a caliper or brake cylinder. Brake fluid can be passed from the line through the hollow screw through to the brake caliper or brake cylinder. For such compounds, so-called "banjo bolts" are used, which in addition to a hollow screw have at least one sealing ring to prevent the emergence of brake fluid at the junction formed. Typically, several sealing rings of soft metals such as copper and tin are used. The US 2013/0001942 A1 For example, describes a caliper with several of the so-called "banjo bolts". The DE 20 2014 102 889 U1 describes a hollow screw for a fluid-conducting connection, wherein the hollow screw has a thickening, which can be brought into abutment with a sealing surface on a surface of a caliper in the mounted state.

In such "banjo bolts", however, there are several disadvantages. On the one hand, the tightness of the connection depends on the torque when screwing in the "banjo bolt". Furthermore, an alignment of the brake hose is required to bring him to the desired position. In addition, the various seals must be mounted in the prescribed order to ensure the required tightness. It must be ensured that the various seals lie flat. However, it is difficult to verify after assembly whether the seals have been installed and positioned correctly, which degrades quality control. In addition, the assembly is relatively expensive due to the large number of components.

Hollow screws can be designed differently and mounted in different ways on a brake caliper, with various additional measures are known to improve such a mechanical and hydraulic connection point. The DE 10 2007 041 322 A1 discloses, for example, the use of a ring nozzle when connecting a brake hose to a brake caliper. This ring nozzle comprises a provided with corresponding bushings block which is connected via a hollow bolt with the caliper. The screw axis runs substantially perpendicular to the course of the brake hose in the connection area.

The DE 20 2011 003 448 U1 on the other hand discloses a pivotable connection for hydraulic lines. Such a connection (ring eye) is also called Schwenkbanjo. From the EP 0 374 135 B1 is a connector device with a rotation known. This locking arms are used.

From the EP 1 342 634 A1 Flexible hydraulic hoses are known which also have a rotation. This rotation is pushed positively during assembly of the hydraulic hose to a brake caliper in a recording. The WO 1997/027094 A1 also discloses a Bremsschlauchverrehsicherung in which a ring nozzle is secured by positive engagement with a projection on the brake caliper against rotation.

The US 7,604,263 B2 describes a connection between two tubes that are pushed together. In the overlapping region of the two tubes, a sealing element and a blocking element are provided. From the US 2006/0152003 A1 is a fluid-conducting connection between a plastic and a metal part known in which after joining the parts of the circumferential collar are molded around the parts, so as to prevent rotation. The JP 2004-353788 A discloses the use of a hollow screw for connecting a brake hose to a brake caliper, wherein the brake hose is connected substantially transversely to the longitudinal axis of the hollow screw.

In view of the state of the art, the area of the joints offers There is still room for improvement between brake lines and components of a brake system.

The invention has for its object to provide an improved connection element with which a brake line can be fluidly connected to a brake caliper.

According to the invention the object is achieved by a connecting element with the features of claim 1, while claim 6 indicates a brake system with such a connecting element. Further, particularly advantageous embodiments of the invention disclose the respective dependent subclaims.

It should be noted that the features listed in the following description as well as measures in any technically meaningful way can be combined with each other and show other embodiments of the invention. The description additionally characterizes and specifies the invention, in particular in connection with the figures.

The connecting element according to the invention is suitable for the fluid-conducting connection of a brake line to the brake caliper of the brake system of a motor vehicle. In this case, the connecting element has a hollow bolt with an inner channel. On the outside of this bolt at least one annular groove is formed, in which a sealing ring is located. This sealing ring may for example consist of rubber, polytetrafluoroethylene (PTFE) or another suitable sealing material.

The bolt of the connecting element is thus formed by a tube, which is preferably smooth except for at least one annular groove with a sealing ring. Further, the outer diameter of the bolt is enlarged at one end, thus forming a thickening. The bolt has at this thickening on a connection point for connecting a brake line to the inner channel of the bolt.

A connecting element designed in this way can be advantageously used to connect a brake line to the brake caliper of a brake system. For this purpose, the bolt of the connecting element is inserted with the sealing ring in a bore within the caliper. The bolt is thus not screwed as usual with hollow screws in the caliper, but inserted into a bore. Further, a brake pipe is connected to the connection point, whereby a fluid-conducting connection between the brake pipe and the brake caliper is made. By the sealing ring of the bolt, the connection between the connecting element and the brake caliper is sufficiently tight, with further sealing means can be omitted. The tightness is essentially independent of how deep the bolt was inserted into the caliper. For example, a sealing effect is also ensured if the bolt has not been fully inserted to a predetermined point in the bore of the caliper. The tightness is therefore in particular not dependent on torques of a screw connection.

The connection point for connecting a brake line to the inner channel is formed in an embodiment of the invention by a bore in which a hollow mandrel is formed with a mandrel channel. This mandrel channel is in fluid communication with the inner channel of the bolt. For a connection of the brake pipe with the inner channel of the bolt, a hose of the brake pipe is pushed or pressed onto the hollow mandrel. The brake pipe can have a larger outer diameter relative to the inner diameter of the thickening, at least at its corresponding hose end, so that adequate securing of the position and sealing of the brake pipe in the thickening can be achieved by pressing in or pushing in. The hollow mandrel can also be conical, so that an annular gap between the outer diameter of the hollow mandrel and the inner diameter thickening in the direction of the bottom decreases in size, so that the position assurance and sealing is further improved. Subsequently, the outer diameter of the thickening can be reduced, which can be done for example by a plastic deformation process such as crimping. The bore with the hose end of the brake pipe lying therein is squeezed in this way and pressed against the outside of the hollow mandrel. In this way, the hose end of the brake pipe is fixed within the bore and is in a tight, fluid-conducting connection with the inner channel of the bolt.

In another embodiment of the invention, the connection point for connecting a brake line to the inner channel of the bolt is formed by an internal thread within the thickening of the bolt. Thus, a brake line with a corresponding external thread can be screwed into the connecting element. However, other suitable types of connection can be used. For example, a brake line having an internal thread, which is screwed onto an external thread on the thickening of the bolt.

In order to fix the connecting element to the brake caliper, a fastening element is preferably attached to its bolt, which has means for fixing the position of the connecting element with respect to a brake caliper. This fastener may be fixed or detachable with the bolt be connected. In one embodiment of the invention, the fastening element is a plate connected to the bolt, which has at least one bore for fixing the position of the connecting element with respect to a brake caliper. Through this hole, the fastener can be attached to the caliper, for example with a bolt or a screw.

The invention also includes the use of such a connecting element for the fluid-conducting connection of a brake line to the caliper of the brake system of a motor vehicle. This use leads to a brake system according to the invention for a motor vehicle, comprising a brake caliper and a brake line for the fluid-conducting connection of the caliper with a Druckagrregat. In this case, a bore is provided in the caliper, in which an inventive connecting element is introduced. This connecting element thus has a hollow bolt with an inner channel, wherein on the outer side of the bolt at least one annular groove is formed, in which there is a sealing ring, which bears sealingly against the inner surface of the inner channel. Further, the diameter of the bolt is enlarged at one end and thus forms a thickening. The brake line is connected to this thickening via a connection point with the inner channel of the bolt.

Such a braking system is easy, fast and safe to assemble. It is not necessary to mount seals in the prescribed order and there is no need to ensure that seals are properly applied to components. Therefore, there is no need to check whether seals have been correctly installed and positioned, which facilitates quality control. In addition, the connection between the brake pipe and brake caliper contains only one connecting element, which facilitates and accelerates the assembly.

In one embodiment of the invention, the brake line is inserted or pressed within the thickening in a bore in which a hollow mandrel is formed with a mandrel channel, which is in fluid-conducting connection with the inner channel of the bolt. The brake line is pushed onto the hollow mandrel, whereby the brake line is fluid-conductively connected to the inner channel of the bolt. The brake pipe can have a larger outer diameter relative to the inner diameter of the thickening, at least at its corresponding hose end, so that adequate securing of the position and sealing of the brake pipe in the thickening can be achieved by pressing in or pushing in. The hollow mandrel can also be conical, so that an annular gap between the outer diameter of the hollow mandrel and the inner diameter thickening in the direction of the bottom decreases in size, so that the position assurance and sealing is further improved. To further fix and seal the hose end of the brake pipe on the hollow mandrel, the hose end is squeezed between the inner surface of the bore and the outer surface of the hollow mandrel. This can be realized for example by crimping the thickening of the bolt in this area.

In another embodiment of the invention, the brake line is screwed into an internal thread within the thickening, via which the brake line is fluid-conductively connected to the inner channel of the bolt.

On the bolt of the connecting element, a fastening element is attached, with which the position of the connecting element is fixed with respect to the caliper. Preferably, the fastener is a plate connected to the bolt having at least one bore. The position of the connecting element is fixed with respect to the caliper by a bolt or a screw is guided through the bore into the caliper. The fastening element can also serve advantageously as a twist protection, which prevents the bolt from rotating within the bore in the brake caliper. Preferably, the plate of the fastener is applied to the caliper.

• 1 eine Seitenansicht einer ersten Ausführungsform eines erfindungsgemäßen Verbindungselements,
• 2 eine Draufsicht auf ein Verbindungselement gemäß 1,
• 3 eine dreidimensionale Ansicht eines Verbindungselements gemäß 1,
• 4 einen Längsschnitt durch einen Teilbereich eines Bremssattels mit eingebautem Verbindungselement,
• 5 einen Längsschnitt durch eine zweite Ausführungsform eines Verbindungselementes,
• 6 ein Verbindungselement gemäß 5 mit eingebrachter Bremsleitung, und
• 7 ein Verbindungselement gemäß 5 mit fixierter Bremsleitung.

Further advantageous embodiments of the invention are disclosed in the subclaims and the following description of the figures. Show it:

• 1 a side view of a first embodiment of a connecting element according to the invention,
• 2 a plan view of a connecting element according to 1 .
• 3 a three-dimensional view of a connecting element according to 1 .
• 4 a longitudinal section through a portion of a caliper with built-in connector,
• 5 a longitudinal section through a second embodiment of a connecting element,
• 6 a connecting element according to 5 with brake pipe inserted, and
• 7 a connecting element according to 5 with fixed brake line.

In the different figures, the same parts are always provided with the same reference numerals, which is why these are usually described only once.

This in 1 shown connecting element 10 is essentially a hollow bolt 11 formed, which is also referred to as a pipe or hollow cylinder for the description of the invention. This bolt 11 has an axially extending inner channel 16 so that fluid can flow from one end to the other end of the hollow cylinder thus formed. This inner channel 16 is the cut of the 4 refer to.

The bolt 11 has substantially a smooth outer surface, but has on its outer side at least one circumferential annular groove 12 on. This ring groove 12 may for example have a rectangular cross-section with or without rounded inner edges. The ring groove 12 is preferably in the region of one end of the bolt 11 , Inside the ring groove 12 is a sealing ring 30 arranged. This has a cross section of the annular groove 12 adapted cross-section. At the opposite end of the bolt 11 its outer diameter is increased, resulting in a thickening 13 formed. Between the tubular base body of the bolt and the thickening 13 thus forms a circumferential stage. In the area of this stage is a fastener 20 , This fastener 20 is plate-shaped and is on one side radially from the bolt 11 from.

2 shows the connecting element 10 in a plan view showing the shape of the fastener 20 can be seen. The plate of the fastener 20 has an oval shape. On one side of the plate is the thickening 13 of the connecting element 10 , The plan view is an axial bore 14 within this thickening 13 refer to. Furthermore, this hole 14 in this embodiment, a connecting element with an internal thread 15 provided, in which a brake pipe with a corresponding external thread can be screwed. In addition, the inner channel 16 which can be seen through the bolt 11 and its thickening 13 runs. On the other side of the plate of the fastener 20 there is a hole 21 ,

The three-dimensional view of the 3 is this basic structure of the connecting element according to the invention 10 with the bolt 11 , its thickening 13 and the fastener 20 refer to. The figure shows the bolt 11 However, without mounted sealing ring, so that the circumferential annular groove 12 is apparent.

The 4 shows such a connection element 10 in a longitudinal section, wherein the connecting element in a bore 51 a caliper 50 is introduced. Further, a brake pipe 40 with the connecting element 10 connected, this brake line 40 only shown by dashed lines. The connecting element 10 is so in the hole 51 introduced that the sealing ring 30 sealing on the inside of the bore 51 is applied. Further, the plate of the fastener is located 20 on the outside of the caliper 50 at. The thickening 13 of the connecting element is thus of the caliper 50 from. Within the thickening 13 is the hole 14 provided in conjunction with the inner channel 16 of the bolt 11 stands. The diameter of this hole 14 is larger than the diameter of the inner channel 16 so that the bore 14 through a funnel-shaped section in the inner channel 16 passes. Into the hole 14 is also an internal thread 15 introduced, in which a corresponding external thread of the brake pipe 40 is screwed. The fastener 20 is also about his hole 21 with the caliper 50 connected, in particular screwed.

5 shows a second embodiment of the connecting element according to the invention, which substantially the first embodiment of the 1 - 4 equivalent. However, the connection point for connecting a brake line is formed differently in this embodiment. There is no internal thread in the thickening 13 in front, but inside the hole 14 there is a hollow mandrel 17. This hollow mandrel 17 has an inner spike channel 18 up in the area of the bottom of the hole 14 in the inner channel 16 of the bolt 11 passes. There is thus a fluid-conducting connection between the mandrel channel 18 of the hollow mandrel 17 and the inner channel 16 of the bolt 11 ,

The hollow mandrel 17 stands from the bottom of the hole 14 and there is an annular gap 19 between the outer surface of the hollow mandrel 17 and the inner surface of the bore 14 educated. The length of the hollow mandrel 17 can be smaller, equal or greater than the depth of the hole 14 be in the embodiment of the 5 smaller than the depth of the hole 14 , Furthermore, the free end of the hollow mandrel 17 , which to the insertion opening of the bore 14 has conically shaped to facilitate the sliding of the brake line.

In order to connect a brake line with such a connecting element, thus, the hose end of a brake line 40 in the annular gap 19 inserted, wherein the opening of a hose end to the hollow mandrel 17 is deferred. In this way, a fluid-conducting connection between the brake line 40 and the inner channel 16 of the bolt 11 produced. This is in the 6 shown. In this case, the aufzuschiebende hose end, so the brake pipe 40 be designed with such an outer diameter that these in the annular gap 19 is pressed. It is also possible to adjust the annular gap accordingly. So is already a sufficient securing position of the brake line 40 reached. Also by the conical configuration of the hollow mandrel 17 a position assurance can be achieved if the annular gap 19 narrows towards the ground. To the brake line 40 To fix further in this position and to seal the joint even further, in the region of the hose end from the outside a force on the thickening 13 applied, by which this plastically deformed (crimping). This is in the 7 schematically represented by two arrows. This can be the thickening 13 be squeezed together and plastically deformed on their entire circumference or only in some areas.

By thus crimping the thickening 13 becomes the hose end of the brake pipe 40 between the inner surface of the bore 14 and the outer surface of the hollow mandrel 17 squeezed and fixed. The hose end can no longer from the hollow mandrel 17 be pulled off, leaving a firm and tight fluid-conducting connection between the brake line 14 and the inner channel 16 of the bolt 11 is trained. This connection is simple and inexpensive to manufacture.

LIST OF REFERENCE NUMBERS

10

connecting member

11

Bolt, pipe

12

ring groove

13

thickening

14

drilling

15

inner thread

16

internal channel

17

hollow mandrel

18

Dorn channel

19

annular gap

20

fastener

21

drilling

30

seal

40

brake line

50

caliper

51

drilling

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• US 2013/0001942 A1 [0003]
• DE 202014102889 U1 [0003]
• DE 102007041322 A1 [0005]
• DE 202011003448 U1 [0006]
• EP 0374135 B1 [0006]
• EP 1342634 A1 [0007]
• WO 1997/027094 A1 [0007]
• US 7604263 B2 [0008]
• US 2006/0152003 Al [0008]
• JP 2004353788 A [0008]

Claims (10)

Connecting element (10) for the fluid-conducting connection of a brake line (40) to the brake caliper (50) of the brake system of a motor vehicle, wherein the connecting element (10) has a hollow bolt (11) with an inner channel (16), on the outside of the bolt ( 11) at least one annular groove (12) is formed, in which a sealing ring (30) is located, and the outer diameter of the bolt (11) is enlarged at one end and so forms a thickening (13), wherein the bolt (11) this thickening (13) has a connection point (14) for connecting a brake line (40) to the inner channel (16). Connecting element after Claim 1 , characterized in that the connection point for connecting a brake line (40) to the inner channel (16) by a bore (14) is formed, in which a hollow mandrel (17) with a mandrel channel (18) is formed, said mandrel channel (18 ) is in fluid communication with the inner channel (16) of the bolt (11). Connecting element after Claim 1 or 2 , characterized in that on the bolt (11) has a fastening element (20) is mounted, which has means for fixing the position of the connecting element (10) with respect to a brake caliper (50). Connecting element after Claim 3 , characterized in that the fastening element (20) is connected to the bolt (11) plate having at least one bore (21) for fixing the position of the connecting element (10) with respect to a brake caliper (50). Use of a connecting element (10) according to one of the preceding claims for the fluid-conducting connection of a brake line (40) to the brake caliper (50) of the brake system of a motor vehicle. Brake system for a motor vehicle, comprising a caliper (50) and at least one brake line (40) for the fluid-conducting connection of the brake caliper (50) to a pressure unit, wherein a bore (51) is provided in the caliper (50) into which a connecting element ( 10) is introduced in particular according to one of the preceding claims, which has a hollow bolt (11) with an inner channel (16), wherein on the outer side of the bolt (11) at least one annular groove (12) is formed, in which a sealing ring ( 30) which bears sealingly against the inner surface of the inner channel (16), wherein the outer diameter of the bolt (11) is enlarged at one end and thus forms a thickening (13), and the brake line (40) at this thickening (13) is connected via a connection point (14) with the inner channel (16) of the bolt (11). Brake system after Claim 6 , characterized in that the brake line (40) within the thickening (13) in a bore (14) is inserted, in which a hollow mandrel (17) with a mandrel channel (18) is formed, which in fluid-conducting connection with the inner channel (16 ) of the bolt (11), wherein the brake pipe (40) is pushed onto the hollow mandrel (17), whereby the brake pipe (40) is fluid-conductively connected to the inner channel (16) of the bolt (11). Brake system after Claim 6 or 7 , characterized in that on the bolt (11) has a fastening element (20) is mounted, with which the position of the connecting element (10) with respect to the caliper (50) is fixed. Brake system after Claim 8 characterized in that the fastener (20) is a plate connected to the bolt (11) having at least one bore (21) and the location of the fastener (10) relative to the caliper (50) is fixed by a bolt or a screw is passed through the bore (21) into the caliper (50). Brake system after Claim 9 , characterized in that the plate of the fastening element (20) rests against the caliper (50).

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