DE102018217338A1 - Connection device for a hydraulic line, in particular on a hydraulic unit - Google Patents

Abstract

A connection device, in particular on a hydraulic unit, for a hydraulic line (48, 49) is proposed, with a socket (50) fastened in a receptacle (52), with at least one sealing ring (68, 70) which is connected to a in the socket (50) insertable connecting element (74) of the line (48, 49) can cooperate to seal the connection device. The at least one sealing ring (68, 70) is arranged offset in the direction of the longitudinal axis (51) of the bushing (50) within the receptacle (52) to the bushing (50). The connecting element (74) can be inserted into the socket (50) arranged in the receptacle (52) in the direction of its longitudinal axis (51) and the connecting element (74) emerges with its end region protruding from the socket (50) within the receptacle (52) (75) through the at least one sealing ring (68, 70). The connecting device (42) can be preassembled in the receptacle (52) and the connecting element (74) can be easily inserted into the socket (50) with a secure seal.

Description

State of the art

The invention relates to a connection device for a hydraulic line, in particular on a hydraulic unit, according to the preamble of claim 1. The invention also relates to a hydraulic unit with a connection device.

Such a connection device and a hydraulic unit in the form of a pump with such a connection device is through the DE 10 2015 210 722 A1 known. This connection device has a socket which is fastened in a receptacle of a housing part of the pump. The receptacle is designed as a bore into which the bush is pressed. A connecting element in the form of a socket is inserted into the socket, a seal between the socket and the socket being effected by means of an adhesive and / or a sealing ring. The socket and the socket form a structural unit which is assembled before the socket is pressed into the receiving bore. A hydraulic line for a fuel supply and / or for a fuel return can be connected to the connection piece. The pump feeds fuel to the pump, which is conveyed by the pump and / or serves to lubricate a drive area of the pump. Fuel is discharged from the pump via the fuel return, which is used, for example, for lubrication and / or cooling of the drive area and which is discharged, for example, to a fuel reservoir. The socket protrudes from the socket, and this must have an orientation of the outlet from the connection device that is suitable for the respective connection conditions. For example, the nozzle can be designed as a straight nozzle or as an angled nozzle. For each deviating connection condition, a special socket is required, which must be connected to the socket. This leads to high manufacturing costs and complex logistics.

Disclosure of the invention

Advantages of the invention

The connection device according to the invention with the features according to claim 1 has the advantage that it only requires the socket fastened in the receptacle, into which the connecting element can be inserted as a counterpart. The connecting element can be, for example, the appropriately designed end region of the hydraulic line or a connecting piece connected to the hydraulic line. The socket itself can always be of the same design and there is a variance in the orientation of the outlet from the connection device in the end region of the hydraulic line or the connecting piece connected to it. A pump for a fuel injection device of an internal combustion engine is usually supplied by the pump manufacturer with the connection device arranged on the pump to the manufacturer of the internal combustion engine, in which the hydraulic connections to the internal combustion engine and a low-pressure system required to supply the pump are established. At the manufacturer of the internal combustion engine, the required orientation of the outlet from the connection device can be achieved in a simple manner according to its requirements by the hydraulic line used with it or a connecting piece connected to it being suitably designed.

Advantageous refinements and developments of the connection device according to the invention are specified in the dependent claims. The design according to claims 2 and 3 enables the connecting element to be fixed in the socket in a simple manner. The embodiment according to claim 8 enables a further improvement of the sealing of the connecting element in the receptacle. The embodiment according to claim 9 enables the two sealing rings to be designed with regard to their effect at different temperatures, whereby a further improvement in the sealing can be achieved at different temperatures. Here, one sealing ring can be optimized for good function at low temperatures and the other sealing ring for good function at high temperatures. The configuration according to claim 10 ensures that the two sealing rings are arranged at a defined distance from one another.

drawing

An embodiment of the invention is shown in the drawing and explained in more detail in the following description. Show it 1 a pump in a simplified representation in a longitudinal section, 2nd a section of a pump with a connection device, 3rd the section of the pump with the connection device in perspective and 4th a locking element of the connection device in a perspective view.

Description of the embodiment

In the 1 to 3rd A pump is shown which is a high-pressure fuel pump for a fuel injector of an internal combustion engine. The pump has at least one pump element 10th on, which in turn is a pump piston 12th has at least indirectly by a drive shaft 14 in one stroke in at least approximately radial direction with respect to the axis of rotation 15 the drive shaft 14 is driven. The drive shaft 14 can be part of the pump or alternatively it can also be provided that the pump does not have its own drive shaft and the drive shaft 14 Is part of the internal combustion engine. The drive shaft 14 can be, for example, a shaft of the internal combustion engine through which the gas exchange valves of the internal combustion engine are also actuated. The drive shaft 14 can be used to drive the pump piston 12th a cam 16 or have eccentrics.

The pump has a pump housing that can be designed in several parts. The pump piston 12th is in a cylinder bore 20th of a first housing part 22 the pump is tightly sealed with the first housing part 22 hereinafter referred to as the cylinder head. With its the drive shaft 14 the pump piston delimits the opposite end 12th in the cylinder bore 20th a pump work room 24th . The pump work room 24th points through an inlet valve 26 that, for example, one in the pump work room 24th Inlet check valve opening into it is a connection to an inlet leading, for example, from a feed pump 28 over which the pump workspace 24th radially inwards to the axis of rotation 15 the drive shaft 14 directed suction stroke of the pump piston 12th is filled with fuel. The pump work room 24th also has an outlet valve 30th that, for example, one from the pump work room 24th outlet check valve that opens is a connection to a drain 32 on, for example, to a high-pressure fuel storage 34 leads and over the at the radially outward from the axis of rotation 15 the drive shaft 14 away delivery stroke of the pump piston 12th Fuel from the pump work room 24th is ousted. The pump piston 12th can, for example, via a roller tappet 36 on the cam 16 the drive shaft 14 support.

The cylinder head 22 is with a housing part 40 connected that an interior 42 has, in which the drive shaft 14 is arranged. On the housing part 40 is at least one connection device 42 provided to which a fuel supply line 48 or a fuel return line 49 for the pump can be connected. Multiple connection devices can also be used 42 on the housing part 40 be provided. It can be provided that via the fuel supply line 48 and the associated connection device 42 Fuel into an interior 44 of the pump housing is supplied to ensure lubrication and / or cooling of the drive area of the pump. Via the fuel return line 49 can fuel from the interior 44 for example, be discharged to a fuel tank. The fuel lines 48 , 49 can be designed, for example, as pipelines or as hose lines. The housing part 40 can be made of metal, for example steel or light metal, or of plastic.

Below is with reference to the 2nd to 4th the connection device 42 described in more detail. The connection device 42 has a socket 50 on that in one shot 52 of the housing part 40 is attached. The recording 52 is designed as a bore and the socket 50 is, for example, in the hole 52 pressed in. The hole 52 is stepped in diameter and has one in the direction of the longitudinal axis 51 the socket 50 furthest inside the housing part 40 arranged section 52a with a small diameter, one on these to the outside of the housing part 40 subsequent section 52b with a slightly larger diameter and one on these to the outside of the housing part 40 subsequent section 52c with an even larger diameter. At the transition between the sections 52a and 52b is a first ring shoulder 54a in the hole 52 formed and at the transition between the sections 52b and 52c is a second ring shoulder 54b in the hole 52 educated.

The socket 50 is also stepped in its outer diameter and inner diameter and has one inside the bore 52 arranged first section 50a with a small outside and inside diameter and one from the hole 52 outstanding second section 50b with a larger outside and inside diameter. On the outer jacket of the socket 50 is at the transition of the sections 50a and 50b one in the hole 52 pointing third ring shoulder 56a formed and inside the socket 50 is at the transition of the sections 50a and 50b one from the hole 52 fourth ring shoulder pointing out 56b educated. The socket 50 is preferably made of metal, but can also be made of a suitable other material, for example plastic.

The outside of the hole 52 arranged second section 50b the socket 50 has a circumferential annular groove in its outer jacket 58 on in which a c-shaped locking element 60 is arranged. The section 50b the socket 50 points in the area of the ring groove 58 an opening extending over part of the circumference thereof 62 on, through which a thigh 60a of the locking element 60 radial with respect to the longitudinal axis 51 the socket 50 inside the section 50b protrudes. The thigh 60a is in the direction of the longitudinal axis 51 the socket 50 by far from the fourth ring shoulder 56b arranged. The one within the section 50b the socket 50 arranged area of the leg 60a of the locking element 60 has a bevel 61 on, the bevel 61 in the direction of the longitudinal axis 51 the socket 50 into the socket 50 into the longitudinal axis 51 runs there. The section 50b the socket 50 points in the area of the ring groove 58 another opening 64 on that in one of the opening 62 opposite circumferential area is arranged. In the wider opening 64 can have a nose protruding radially inwards 65 of the thigh 60a opposite leg 60b of the locking element 60 click into place. The locking element 60 is elastically expandable, with both legs 60a and 60b are movable away from each other. The locking element 60 is preferably made of plastic, but can also be made of another suitable material, for example metal.

In the section 52b the hole 52 is between the socket 50 and the first ring shoulder 54a at least one sealing ring 68 arranged. Preferably there are two sealing rings 68 and 70 provided in the direction of the longitudinal axis 51 the socket 50 are arranged offset to each other. Between the two sealing rings 68 , 70 can be a spacer 72 be arranged around the two sealing rings 68 , 70 to be fixed at a defined distance from each other. The two sealing rings 68 , 70 are for example made of plastic or rubber, but made of different materials. A sealing ring is preferred 68 made of a material with good cold flexibility and the other sealing ring 70 Made of a material with high temperature resistance to ensure a secure seal both in cold and high temperatures.

Below is the assembly of the socket 50 and the sealing rings 68 , 70 in the hole 52 explained. Before inserting the socket 50 in the hole 52 is in the ring groove 58 the socket 50 transverse to the longitudinal axis 51 the locking element 60 introduced until this with his thigh 60a in the opening 62 and with his nose 65 in the wider opening 64 snaps into place. Then put in the jack 50 a nozzle from the outside 74 inserted, which is essentially cylindrical and an outwardly projecting collar 76 having. The stub 74 is going in the direction of the longitudinal axis 51 into the socket 50 inserted, its fret 76 on the bevel 61 of the thigh 60a of the locking element 60 slides on and the thigh 60a radial to the longitudinal axis 51 is pressed outwards under elastic deformation, so that the collar 76 on the thigh 60a can get past. In the end position of the nozzle 74 he comes with his covenant 76 on the fourth ring shoulder 56b inside the socket 50 to plant and the thigh 60a snaps on the fourth ring shoulder 56b opposite side of the federal government 76 a. The stub 74 is thus in the socket 50 held. The stub 74 protrudes with its end area 75 from the socket 50 on whose the locking element 60 side facing away. To the end area 75 of the neck 74 the two sealing rings 68 , 70 and the spacer ring arranged between them 72 postponed. The one from the socket 50 protruding end area 75 of the neck 74 can have depressions in its outer jacket 73 , for example in the form of ring grooves around the sealing rings 68 , 70 to keep so that this does not come from the nozzle during further assembly 74 slide down. The depth and shape of the wells 73 is selected so that the sealing rings are damaged 68 , 70 when pushed onto the nozzle 74 is avoided.

The assembly assembled as above is in the hole 52 introduced and the jack 50 is in the bore through its outer jacket 52 pressed in. The socket is in its end position 50 with her third ring shoulder 56a on the second ring shoulder 54b in the hole 52 at. The two sealing rings 68 , 70 lie with a slight preload in the direction of the longitudinal axis 51 on the one hand at the front end of the socket 50 and on the other hand on the first ring shoulder 54a in the hole 52 at.

The stub 74 is advantageously closed at at least one end and thereby serves as a closure element for the socket 50 and the hole 52 so no fuel from the hole 52 emerge and no pollution in the socket 50 or bore 52 can enter from the outside. The stub 74 can at its out of the socket 50 protruding end of a collar enlarged in diameter 77 exhibit. The pump is pressed in with the socket 50 as well as the neck 74 delivered to the customer where the fuel lines 48 , 49 be connected to the pump. In this case, the nozzle is at the customer 74 removed by the locking element 60 is solved and the nozzle 74 from the socket 50 is pulled out. For pulling out the nozzle 74 can on its collar 77 be attacked manually. The two sealing rings 68 , 70 and the spacer ring 72 remain after removing the nozzle 74 in the hole 52 in their between the jack 50 and the first ring shoulder 54a fixed position.

Instead of the nozzle 74 will then become a connector in the socket 50 inserted the one with a fuel line 48 , 49 connected neck that can be like the neck 74 is formed, but is not closed, and in its end position by the locking element 60 in the socket 50 is secured. The sealing rings 68 , 70 lie on the outer jacket of the inside the hole 52 from the socket 50 projecting end portion of the connector and seal the connection device. The connector used by the customer can be designed as a straight connector or an angled connector. Alternatively, it can also be provided that the end region of the fuel line at the customer 48 , 49 serves as a connecting element according to the nozzle 74 is formed, the end region of the fuel line 48 , 49 directly into the socket 50 inserted and by means of the locking element 60 is fixed.

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included 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.

Patent literature cited

• DE 102015210722 A1 [0002]

Claims (12)

Connection device, in particular on a hydraulic unit, for a hydraulic line (48, 49), with a bushing (50) fastened in a receptacle (52), with at least one sealing ring (68, 70), which is connected to the bushing (50 ) insertable connecting element (74) of the line (48, 49) for sealing the connection device, characterized in that the at least one sealing ring (68, 70) in the direction of the longitudinal axis (51) of the socket (50) inside the receptacle (52 ) offset to the socket (50), that the connecting element (74) can be inserted into the socket (50) arranged in the receptacle (52) in the direction of its longitudinal axis (51) and that the connecting element (74) with its inside the receptacle (52) from the socket (50) protruding end region (75) through the at least one sealing ring (68, 70). Connection device after Claim 1 , characterized in that at least one locking element (60) is arranged on the socket (50) outside the receptacle (52), through which the connecting element (74) in the socket (50) in the direction of the longitudinal axis (51) of the socket (50 ) can be fixed. Connection device after Claim 2 , characterized in that the locking element (60) is movably held on the socket (50), preferably in an annular groove (58) of the socket (50). Connection device after Claim 3 , characterized in that the locking element (60) is at least approximately C-shaped and elastically deformable and can be latched with a leg (60a) on the connecting element (74). Connection device according to one of the Claims 1 to 3rd , characterized in that within the bushing (50) there is provided a stop (56b) which is arranged transversely to its longitudinal axis (51) and against which the connecting element (74) comes to rest. Connection device after Claim 4 , characterized in that the bushing (50) has a stepped inner diameter and a section (50a) with a smaller inner diameter towards the at least one sealing ring (68, 70) and a section (averted from the at least one sealing ring (68, 70) 52b) with a larger inner diameter and that the stop is formed by an annular shoulder (56b) present at the transition of the sections (52a, 52b). Connection device according to one of the preceding claims, characterized in that the socket (50) has in its outer jacket a shoulder (56a) which is arranged transversely to its longitudinal axis (51) and which on a corresponding shoulder (54b) in the receptacle (52) in the direction the longitudinal axis (51) of the socket (50) comes to rest. Connection device after Claim 6 , characterized in that the bushing (50) has a stepped outer diameter and a section (50a) with a small outer diameter facing away from the at least one sealing ring (68, 70) and a section (50b.) facing away from the at least one sealing ring (68, 70) ) with a larger outer diameter and that the shoulder (56a) is formed at the transition of the two sections (50a, 50b) of the bushing (50). Connection device according to one of the preceding claims, characterized in that at least two sealing rings (68, 70) are provided, which are arranged offset to one another in the direction of the longitudinal axis (51) of the socket (50). Connection device after Claim 8 , characterized in that the at least two sealing rings (68, 70) are made of different materials. Connection device after Claim 8 or 9 , characterized in that a spacer ring (72) is arranged between the at least two sealing rings (68, 70). Hydraulic unit, in particular a pump, which is connected to at least one hydraulic line (48, 49) via at least one connection device (42), characterized in that the at least one connection device (42) is designed according to one of the preceding claims.

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