DE102013220640A1 - Hydraulic coupling, plug and socket - Google Patents

Abstract

The present invention relates to a hydraulic coupling with a plug socket with an axial first bore and at least one groove extending along the bore and with at least one undercut running at least in the circumferential direction starting from the groove. The undercut comprises a channel and an end region. The hydraulic coupling further comprises a plug with at least one locking element, wherein the plug can be inserted into the first bore of the socket in the axial direction, the locking element via the groove and then by mutual rotation of the plug and socket at least in the circumferential direction through the channel the end area can be transferred to form a bayonet lock and to fix the plug and socket in an axial direction. The invention further relates to a plug and a socket. The hydraulic coupling shown and described here has a less complex structure than previously known corresponding couplings, whereby the permanent connection of plug and socket and the sealing function are guaranteed. The assembly effort for creating the connection is lower.

Description

The invention relates to a hydraulic coupling and a plug and a socket, in particular for the hydraulic coupling. The hydraulic coupling is used to connect two strands of a hydraulic system.

From the EP 1 924 802 A1 is a generic hydraulic coupling known in the plug and socket form a bayonet lock, wherein the hydraulic clutch is additionally secured by a wire form spring against rotation. In addition, other solutions are known in which externally mounted on the plug ribs engage in the socket externally arranged adapter grooves. The axial locking is fulfilled there by a wire-forming spring which jams between a shoulder on the plug and radial grooves on the socket. An axial locking can also be achieved by the use of rivets or screws extending transversely to the axial extent of the plug and socket by grooves in each plug and socket, so that in the axial direction a positive connection is ensured. In a positive connection, one of the connection partners is in the way of another.

These known connection variants are costly due to the use of additional fasteners and require considerable effort during assembly. In addition, the use of wire-form springs can lead to a greater contact force between plug and socket being produced during assembly of the wire-forming spring. As a result of this increased contact pressure, sealing rings used in the coupling can be loaded too heavily, so that the risk of damage to the seal increases and the possibility of a functional failure becomes more probable.

On this basis, the present invention has the object, at least partially overcome the known from the prior art disadvantages. In particular, a cost-effective hydraulic clutch is to be provided, which ensures the tightness of the connection and also facilitates the assembly. The object is solved by the features of independent claims 1, 5 and 6. Advantageous developments are the subject of the dependent claims.

The invention relates to a hydraulic coupling comprising a socket with an axial first bore and at least one groove extending along the bore and at least one undercut extending from the groove at least in the circumferential direction, comprising a channel and an end region, the channel in a axial direction, a first minimum height h and the end region have a second minimum height H, where H> h. The hydraulic coupling further comprises a plug with at least one locking element, wherein the plug can be inserted into the first bore of the socket in the axial direction, wherein the locking element via the groove and then by mutual rotation of the plug and socket at least in the circumferential direction through the channel in the end region can be transferred to form a bayonet closure and to fix the plug and socket in an axial direction. The end region forms a stop towards the channel, wherein the at least one locking element is elastically compressible at least in the axial direction to a first height, wherein the locking element at least partially relaxes in the end region and with the stop in the circumferential direction forms a positive connection and thus an anti-rotation ,

The hydraulic coupling is used in particular the connection of two strands of a hydraulic system, said plug and / or socket directly to a hydraulic device, such as. As a pump, a piston, a measuring instrument, can be arranged. It is therefore not necessary that the plug and socket are each connected to a wiring harness. These can also be arranged directly on a hydraulic device.

The locking element mentioned here serves in particular as part of the bayonet closure, by which a fixation in the axial direction of the plug and socket is ensured. Furthermore, the locking element serves to ensure that an anti-rotation device is provided in the circumferential direction. For this purpose, the locking element in particular has an elastic spring element which can be elastically deformed and relaxed in an axial direction. In particular, therefore plug and socket are pushed together in an axial direction, wherein the locking element is immersed in a corresponding groove of the socket to the movement in the axial direction is followed at the same time or successively a rotation of the plug and socket, so that the plug against the socket twisted in the circumferential direction. In a simultaneous axial movement and rotation thus takes place a helical movement of the plug relative to the socket.

To the groove of the socket, an undercut connects, which forms a channel following the groove, in which the locking element due to the rotation of the plug opposite Plug socket can be pushed. An end region, which is suitable for receiving the locking element, adjoins the channel in the circumferential direction. The end portion itself has a second minimum height in the axial direction, which is greater than the first minimum height of the channel. In the end region, therefore, the locking element relaxes at least partially and forms a positive connection with the stop between the end region and the channel. By this positive locking a rotation back in the circumferential direction without further aids is not possible, so that an anti-rotation is generated.

In particular, at least the channel also extends in an axial direction, so that the plug performs a helical movement for closing the clutch (likewise for opening the clutch).

According to a further advantageous embodiment, the stop is formed on the side of the end portion, which is arranged closer to the plug. In particular, it is proposed that in this case the locking element has at least one elastic spring element which is arranged on the, to the female connector side facing the locking element. In this case, the plug is inserted into the socket in the axial direction, wherein the locking element moves through the groove extending along the first bore. At the end of the groove, the locking element is in particular kormpimiert by a bottom of the undercut, so that the locking element can be inserted by a rotation of the plug relative to the socket in the circumferential direction in the channel of the undercut.

In particular, it is proposed that the channel has a conical inlet, so that the compression of the locking element in the axial direction (successively) takes place only within the channel as a result of the rotation.

The formation of the stop on the side of the end region arranged closer to the plug is particularly advantageous because the plug and socket are forced apart when the hydraulic clutch is acted upon by an operating pressure of a hydraulic fluid. Accordingly, the locking element is pressed against the arranged closer to the connector side of the end portion on which the stopper is formed. A solve the positive connection between locking element and channel under operating condition of the hydraulic clutch is thus effectively avoided.

According to a further advantageous embodiment, a housing of the socket is open at least in the end region in a radial direction to the outside. In particular, such an open housing can be used so that the positive connection between the locking element and the channel can be canceled by a manual intervention from the outside.

According to an advantageous development, the at least one locking element has a largest cross-sectional area transversely to the axial direction and a contact surface over which the locking element is supported on a bottom of the undercut, wherein the contact surface at most 30%, in particular at most 20% and preferably at most 10% of Area of the largest cross-sectional area is.

In particular, the contact surface is associated with a spring element that is elastically deformable in an axial direction. The spring member causes the elastic deformation of the locking member in the axial direction.

The significantly smaller compared to the largest cross-sectional area of the locking element contact surface causes the locking element during displacement in the circumferential direction through the channel towards the end region causes only a slight frictional resistance.

The present invention is further directed to a plug for a hydraulic coupling, in particular for the coupling according to the invention, wherein the plug is a substantially cylindrical body having an outer peripheral surface and an axial second bore for a medium, in particular a hydraulic fluid (eg ) having. At least one locking element for a bayonet closure with a socket is arranged on the outer circumferential surface. The locking element is elastically compressible to a first height at least in the axial direction.

The present invention is further directed to a female connector for a hydraulic coupling, in particular for the coupling according to the invention, wherein the female connector has an axial first bore and at least one, extending along the first bore groove. In the first bore at least one, adjoining the groove, extending at least in a circumferential direction undercut for a bayonet closure with a plug is formed, wherein the undercut comprises a channel and an end portion. The channel has a first minimum height h in an axial direction and the end portion has a second minimum height H, where H> h, and wherein the end portion forms a stop towards the channel.

In particular, it is proposed that at least the channel of the socket also extends in an axial direction, so that the channel winds helically around the first bore.

According to a particularly advantageous embodiment of the socket, the stop is formed on the side of the end portion which is closer to an insertion opening for a plug.

It is particularly advantageous that a housing of the socket is open at least in the end region in a radial direction to the outside

The statements made with respect to the hydraulic clutch apply in particular to the plug according to the invention and the plug socket according to the invention and vice versa. In addition, the features listed individually in the claims in any technologically meaningful way, combined with each other and can be supplemented by explanatory facts from the description and details of the figures, wherein further embodiments of the invention are shown.

The invention and the technical environment will be explained in more detail with reference to FIGS. The figures show particularly preferred embodiments, to which the invention is not limited. In particular, it should be noted that the figures and in particular the illustrated proportions are only schematic. Like reference numerals in the figures indicate like objects. Show it:

1 a motor vehicle with a hydraulic clutch,

2 : a hydraulic coupling in a perspective view in section,

3 a hydraulic coupling according to 2 , where plug and socket are pushed together,

4 : a hydraulic coupling according to the 2 and 3 with the plug twisted against the socket,

5 : a hydraulic coupling in a side view in section,

6 : a hydraulic coupling in the closed state in a side view,

7 : a plug in a side view,

8th a first variant of a locking element,

9 : a second variant of a locking element

10 a third variant of a locking element,

11 : a socket in perspective view.

1 shows a possible embodiment of a hydraulic system in a motor vehicle 33 with a clutch release device 25 , a master cylinder 23 and a slave cylinder 24 , A hydraulic clutch 1 is in the embodiment shown in a pressure medium line 32 installed and separates them into a first wiring harness 30 and a second wiring harness 31 , Of course, the hydraulic clutch 1 directly on the master cylinder 23 or the slave cylinder 24 be arranged. The clutch release device 25 operates the clutch 26 hydraulically by acting on the master cylinder 23 by means of a pedal 22 , Instead of a pedal, an electromechanical actuator can also be provided here. As a result, by means of a mechanical transmission between pedal / actuator 22 and master cylinder 23 Pressure in the master cylinder 23 built, the on the pressure medium line 32 or the first wiring harness 30 , the hydraulic clutch 1 and the second wiring harness 31 a pressure in the slave cylinder 24 builds. The slave cylinder 24 brings here via a release bearing on the clutch 26 the necessary release force, so that the clutch 26 is pressed. With the clutch closed 26 transfers the crankshaft 28 the torque of the engine 27 over the transmission input shaft 29 on a not shown here gear and then on the drive wheels of the motor vehicle 33 ,

The following 2 - 6 show the hydraulic clutch 1 in detail.

2 shows the hydraulic clutch 1 in perspective view and in section. socket 2 and plugs 10 are along an axis 39 arranged to each other. The plug 10 is opposite the socket 2 now in the axial direction 9 moved, leaving a locking element 11 on the plug 10 in a groove 4 the socket 2 dips. The locking element 11 is on an outer peripheral surface 19 of the cylindrical body 18 of the plug 10 arranged and has a largest cross-sectional area 41 transverse to the axial direction 9 and parallel to the circumferential direction 5 on. The plug 10 has a second hole 20 on, by the closed hydraulic clutch 1 a hydraulic pressure medium 21 (eg, a fluid, oil). The socket 2 has a housing 12 and a first hole 3 on that in the area of the insertion opening 38 for receiving the plug 10 is designed. Through the first hole 3 flows with closed hydraulic clutch, the hydraulic pressure medium 21 , The socket 2 has at least one groove 4 on, for receiving the at least one locking element 11 of the plug 10 suitable is. When moving the plug 10 in the axial direction 9 opposite the socket 2 becomes the locking element 11 far into the groove 4 the socket 2 pushed in that the locking element 11 in the undercut 6 entry. The locking element 11 meets the ground 40 the undercut 6 and is compressed and is thus inserted into the channel 7 the undercut 6 , The insertion of the locking element 11 in the channel 7 the socket 2 done by a twist of plug 10 opposite the socket 2 in the circumferential direction 5 ,

3 shows the hydraulic clutch 1 according to 2 in the state after the displacement of the plug 10 opposite the socket 2 in the axial direction 9 , The locking element 11 is now in the undercut 6 and is in the compressed state. The locking element has a spring element 37 with a contact surface 42 on. The spring element 37 lies with the contact surface 42 on the ground 40 the undercut 6 on. The locking element 11 can now by twisting plug 10 opposite socket 2 in the circumferential direction 5 in the channel 7 enter. Through the small contact surface 42 a low frictional resistance is formed. As a result of the movement of plugs 10 opposite socket 2 becomes a bayonet lock 13 between plugs 10 and socket 2 generated. First drilling 3 and second hole 20 now form a pressure medium line 32 for a hydraulic medium 21 , The pressure medium line 32 is through a seal 34 sealed to the outside.

4 shows the hydraulic clutch 1 in closed state in perspective view. The plug 10 is opposite the socket 2 in the axial direction 9 through the groove 4 so far moved that the locking element 11 in the channel 7 the undercut 6 could be screwed by twisting the plug 10 opposite the socket 2 in the circumferential direction. This is a bayonet lock 13 realized. In the illustrated view, the housing 12 the socket 2 a channel open to the outside 6 and an open end area 8th on. In the view shown is the locking element 11 already in the end area 8th the undercut 6 arranged. The locking element 11 has now at least partially in the axial direction 9 relax and make with the stop 14 in the end area 8th a positive connection in the circumferential direction 5 , A twist of plug 10 opposite socket 2 is not possible now. The stop shown here 14 is at the side 16 of the end region 8th formed, which is arranged closer to the insertion opening for the plug. In other words, the attack 14 at the bottom 40 the undercut 6 opposite side 16 arranged.

5 shows plug 10 and socket 2 in section in a side view according to 3 , In this view, two states are the shift between plugs 10 and socket 2 in the axial direction 9 shown. In the illustration on the right side of the 5 is the locking element 11 in the groove 4 the socket 2 , The locking element 11 is in a relaxed state and has a relaxed second height 36 on. When moving further in the axial direction 9 of the plug 10 opposite the socket 2 hits the locking element 11 on the ground 40 the undercut 6 , By providing a contact force, the locking element 11 compressed, so now only a lower first height 35 the locking element is present. In this state, the locking element 11 in the channel 7 the undercut 6 be inserted in the circumferential direction. Again, it is shown that the socket 2 in the radial direction 17 outward an open undercut 6 or an open channel 7 having.

6 shows the hydraulic clutch 1 in the closed state. locking element 11 and stop 14 form a positive connection 15 in the direction of traffic 5 , The stop 14 is at the side 16 of the end region 8th formed closer to the plug 10 is arranged. The locking element 11 is now at least partially relaxed and has a first height 35 on, the height H of the end 8th equivalent. In the right part of the 6 is the locking element 11 in the canal 7 the undercut 6 , It is there in a compressed state and has a lower second height 36 on. The second height 36 corresponds essentially to the first minimum height h of the channel 7 ,

In 6 , but also in the other previous ones 2 to 5 , is well recognizable that by increasing the contact force between plugs 10 and socket 2 the present form fit 15 between locking element 11 and stop 14 can be solved. By applying such an increased contact force of the plug 10 opposite the socket 2 in the axial direction 9 towards the socket 2 be moved so that the locking element 11 is compressed. Accordingly, the locking element would 11 to a first height 35 be compressed, so that the positive connection at the stop 14 is solved and a twist of plug 10 opposite socket 2 becomes possible again. The first height 35 therefore essentially corresponds to the minimum height h of the channel 7 , allowing a gradual twisting of the plug 10 opposite the socket 2 done and the locking element 11 again in the channel 7 can occur.

Should with the same configuration of the locking element 11 the stop 14 in the area of the soil 40 of the canal 7 be arranged, so could a release of the connection of the hydraulic clutch 1 only take place when the locking element 11 through the outwardly open end region 8th is compressed by external (manual) intervention. An increase or decrease of the contact force would not allow release of the connection in this case.

7 shows a plug 10 in particular for the hydraulic clutch 1 according to 2 to 6 can be used. The plug 10 has a locking element 11 on the outer peripheral surface 19 the substantially cylindrical body 18 on. The locking element 11 has a spring element 37 on, in the axial direction 9 is elastically compressible.

8th shows a first variant of a locking element 11 with a resilient and compressible spring element in the axial direction 37 ,

9 shows according to a second variant of a locking element 11 wherein two elastic spring elements are shown.

10 shows a third variant of a locking element 11 ,

11 shows a socket 2 in a perspective view, in particular for the hydraulic clutch 1 according to 2 to 6 or together with the plug according to 7 can be used. The socket 2 has a housing 12 with an insertion opening 38 for a plug 10 , A first hole 3 extends from the insertion opening 38 in the axial direction 9 through the socket 2 therethrough. Along the first hole 3 are two grooves 4 educated. In the axial direction 9 close to the grooves 4 undercuts 6 at. The undercuts 6 each form one in the circumferential direction 5 and here additionally in the axial direction 9 extending channel 7 with a floor 40 , To the canal 7 closes an end area 8th at the bottom 40 opposite side 16 a stop 14 opposite the canal 7 formed. The channel 7 here winds helically around the first hole 3 , The channel 7 points at least in the area of the transition to the end area 8th a first minimum height h and the end area 8th a second minimum height H, where H> h.

LIST OF REFERENCE NUMBERS

1

 Hydraulic coupling

2

 socket

3

 First drilling

4

 groove

5

 circumferentially

6

 undercut

7

 channel

8th

 end

9

 Axial direction

10

 plug

11

 locking element

12

 casing

13

 bayonet catch

14

 attack

15

 form-fit

16

 page

17

 Radial direction

18

 body

19

 Outer circumferential surface

20

 Second hole

21

 print media

22

 pedal

23

 Master cylinder

24

 slave cylinder

25

 Clutch bearing

26

 clutch

27

 combustion engine

28

 crankshaft

29

 Transmission input shaft

30

 First wiring harness

31

 Second wiring harness

32

 Pressure medium line

33

 motor vehicle

34

 poetry

35

 Compressed height

36

 Relaxed altitude

37

 spring element

38

 insertion opening

39

 axis

40

 ground

41

 Cross sectional area

42

 contact area

H

 first minimum height

H

 second minimum height

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

• EP 1924802 A1 [0002]

Claims (10)

Hydraulic coupling ( 1 ) comprising a socket ( 2 ) with an axial first bore ( 3 ) and at least one, along the bore ( 3 ) extending groove ( 4 ) and at least one, starting from the groove ( 4 ) at least in the circumferential direction ( 5 ) undercut ( 6 ), which has a channel ( 7 ) and an end region ( 8th ), wherein the channel ( 7 ) in an axial direction ( 9 ) a first minimum height h and the end region ( 8th ) have a second minimum height H, where H>h; and a plug ( 10 ) with at least one locking element ( 11 ), whereby the plug ( 10 ) into the first hole ( 3 ) of the socket ( 2 ) in the axial direction ( 9 ) can be inserted, wherein the locking element ( 11 ) over the groove ( 4 ) and then by mutual rotation of plug ( 10 ) and socket ( 2 ) at least in the circumferential direction ( 5 ) through the channel ( 7 ) in the end area ( 8th ) is convertible to form a bayonet closure ( 13 ) and for fixing plugs ( 10 ) and socket ( 2 ) in an axial direction ( 9 ), the end region ( 8th ) a stop ( 14 ) to the canal ( 7 ), wherein the at least one locking element ( 11 ) at least in the axial direction ( 9 ) is elastically compressible to a first height ( 35 ), wherein the locking element ( 11 ) in the end region ( 8th ) at least partially relaxed and with the attack ( 14 ) in the circumferential direction ( 12 ) a positive connection ( 15 ) and thus forms a rotation. Hydraulic coupling ( 1 ) according to claim 1, wherein at least the channel ( 7 ) also in an axial direction ( 9 ), so that the plug ( 10 ) for closing the clutch ( 1 ) performs a helical movement. Hydraulic coupling ( 1 ) according to one of the preceding claims, wherein the stop ( 14 ) on one side ( 16 ) of the end region ( 8th ) is formed closer to the plug ( 10 ) is arranged. Hydraulic coupling ( 1 ) according to one of the preceding claims, wherein a housing ( 12 ) of the socket ( 2 ) at least in the end region ( 8th ) in a radial direction ( 17 ) is open to the outside. Hydraulic coupling ( 1 ) according to one of the preceding claims, wherein the at least one locking element ( 11 ) a largest cross-sectional area ( 41 ) transverse to the axial direction ( 9 ) and a contact surface ( 42 ), over which the locking element ( 11 ) on a floor ( 40 ) of the undercut ( 6 ), whereby the contact surface ( 42 ) not more than 30% of the area of the largest cross-sectional area ( 41 ) is. Plug ( 10 ) for a hydraulic clutch ( 1 ), in particular for a coupling ( 1 ) according to one of the preceding claims, wherein the plug ( 10 ) a substantially cylindrical body ( 18 ) with an outer peripheral surface ( 19 ) and an axial second bore ( 20 ) for a medium ( 21 ), wherein on the outer peripheral surface ( 19 ) at least one locking element ( 11 ) for a bayonet closure ( 13 ) with a socket ( 2 ) is arranged, wherein the locking element ( 11 ) at least in the axial direction ( 9 ) is elastically compressible to a first height h. Socket ( 2 ) for a hydraulic clutch ( 1 ), in particular for a coupling ( 1 ) according to one of the preceding claims 1 to 5, wherein the socket ( 2 ) an axial first bore ( 3 ) and at least one, along the first bore ( 3 ) extending groove ( 4 ), where in the first bore ( 3 ) at least one, to the groove ( 4 ), at least in one circumferential direction ( 5 ) undercut ( 6 ) for a bayonet closure ( 13 ) with a plug ( 10 ), wherein the undercut ( 6 ) a channel ( 7 ) and an end region ( 8th ), wherein the channel ( 7 ) in an axial direction ( 9 ) a first minimum height h and the end region ( 8th ) have a second minimum height H, where H> h, and wherein the end region ( 8th ) a stop ( 14 ) to the canal ( 7 ). Socket ( 2 ) according to claim 7, wherein at least the channel ( 7 ) also in an axial direction ( 9 ), so that the channel ( 7 ) helically around the first bore ( 3 ) winds. Socket ( 2 ) according to claim 7 or 8, wherein the stop ( 14 ) on one side ( 16 ) of the end region ( 8th ) is formed closer to an insertion opening ( 38 ) for a plug ( 10 ) is arranged. Socket ( 2 ) according to one of claims 7 to 9, wherein a housing ( 12 ) of the socket ( 2 ) at least in the end region ( 8th ) in a radial direction ( 17 ) is open to the outside.

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