DE8509505U1 - Vane vacuum pump - Google Patents

Description

0-1459 gm

Vane cell vacuum pump

The invention relates to a vane vacuum pump according to the preamble of claim 1. Such a vane vacuum pump is from DE-OS 29 52 401 known.

Such vane vacuum pumps are used in the use of diesel engines and injection Otto engines in motor vehicles related to the creation of pneumatic brake booster, whereby the negative pressure generated by the pump for Brake booster is used. Since the pneumatic system is particularly less susceptible to malfunctions, by means of the vacuum also actuates other servo drives, in particular the gear adjustment, the headlight adjustment, the seat adjustment, etc.

The known vacuum pumps are usually flanged directly to the housing of the drive motor and the drive shaft of the The pump is connected to a shaft of the drive motor, for example the camshaft, directly through a coupling. the The bearings of the vacuum pump are lubricated, for example, through an axial bore in the drive shaft of the Motor and the coupled shaft of the vacuum pump. In the known vane vacuum pumps mentioned at the beginning Type is the lubricating oil that gets into the hollow shaft of the pump through radial bores also into the wing root spaces required and to seal the gaps on the guide surfaces the wing and used to reduce friction on the wing heads.

The coupling between the drive shaft of the internal combustion engine and the hollow shaft of the vane pump is at known units designed as a compensating coupling, which ensures safe driving of the pump rotor and Compensates for misalignment. It is loose, with a coupling

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lung teeth or drivers provided with intermediate piece Play is used between the driving shaft on the motor side and the pump shaft.

When assembling the vane vacuum pump on the engine block and especially when repairing or replacing a vane vacuum pump, there is a risk that the Loose coupling to be used between the shafts (intermediate lighting and work on in the vehicle built-in motor or during repair work and when the components that have been removed or replaced are heavily greased are. However, since the lack of the clutch is only discovered later when checking the servo systems, it works valuable working time lost due to a corresponding rework.

The object of the present invention is to provide a vane vacuum pump to create the type indicated in the introduction, in which the pump rotor, the coupling and the driving shaft the drive machine can be assembled in a few simple steps and where facilities are provided, by which it is ensured that the components required for torque transmission without any special inspection and are built in with the play necessary for their function.

This object is achieved according to the invention by the in the characterizing part of claim 1 specified features.

30th

This ensures that the compensating coupling is captively fastened to the rotor shaft in the axial direction is so that they can be used during assembly or repair work in which the vane vacuum pump is removed from the engine block must be, can no longer be forgotten or lost.

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An advantageous structural design and arrangement of the compensating coupling is given in claims 2 and 3. This solution has the advantage that the cooperating with the rotor shaft, radial teeth or drivers Compensating coupling protrude axially into the rotor shaft and the bearing housing of the rotor and preferably flush with it complete this. Only those to intervene with the driving

ucuucii new uca l'iuuuia υτζο ι ~ χιιΐΐιιι ~ ςτχι aAiaxcii actinid v * Jd. Drivers of the compensating coupling protrude axially from the pump housing and are inserted positively into a corresponding radial slot in this shaft during assembly with the drive shaft.

The captive fastening of the compensating coupling on the shaft journal of the rotor is carried out structurally by a Compensating coupling and pin coaxial to the rotor shaft, which can be clamped in the rotor shaft. The attachment can also be accomplished by a pipe that the supply of the lubricating oil from the lubricating oil supply of the drive motor in the Vane vacuum pump is used and also has the function of jamming the coupling with the rotor shaft. Details, which concern the structural design of this connecting and fastening piece or pipe are in the Claims 4 and 5 to 7 and the following description given. Regarding the fastening of the compensating coupling Various designs are possible on the rotor shaft, depending on how light or difficult it is is supposed to separate the components again.

The invention is based on an exemplary embodiment Descriptive drawing belt explained in more detail. It is:

1 shows an axial partial longitudinal section of a vane cell vacuum pump according to section ί-ί in FIG. 2;

Fig. 2 is a cross section of the pump according to section ίί-Ιί in

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i'ig. 3a / alternative embodiment examples of the attachment b the compensating coupling on the shaft journal of the pump rotor in a partial longitudinal section;

Tig. 4 the compensating coupling in a view and in cross section.

The wing illustrated in FIG. 1 in a Tei1längsschnitt -zellenvakuumpumpe consists of the pump housing 1, which is a plan rotated lid 2, in which an intake port 3 is formed and which is fixed by umfangsvertei1 te screws 4 to the housing 1, _f sealed . The pump housing 1 has a cylindrical

\ 20 turning 5 and has a bearing eye 7 arranged eccentrically for this purpose in the housing base 6 for one-sided mounting of the shaft journal 8 firmly attached to the rotor 9. In the rotor 9 are

for example four wings 10 in radial guide slots arranged to be radially movable. For reasons of symmetry, the blades 10 are uniform on the circumference of the rotor 9 distributed, with two guide slots diametrically opposite each other and adjacent blades 10 a rotor segment of 90 °. To reduce the weight of the rotor, material recesses, for example axial bores 11, are preferably provided between adjacent vane slots. hen that extends from one end face of the rotor 9 to the other extend.

The housing bottom is on its periphery as a centering flange designed to mount the vane vacuum pump on the housing 13 an internal combustion engine, in particular to be able to fasten coaxially to the camshaft 14.

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The ir bearing eye of the housing base 6 overhung Shaft journal 8 has an axial bore 18 which extends up to the end face of rotor 9. Of this radial bores 15 go out with the wing root spaces 16 of the wing slots communicate and through the to the Immerse coupling pins 17 attached to the wing feet into the axial bore 18. If one of them gets stuck or jammed Wing 10 in its retracted position (bottom dead center), this wing 10 is supported by the coupling pin 17 of the opposite overlying vane 10 when the rotor 9 continues to rotate pushed radially outwards.

It should be mentioned that structurally differently constructed blades ze! 1envakuumpumps, for example those with two hook-shaped wings according to DE-OS 35 07 176, known are for which the subject matter of the invention in an analogous manner is applicable.

The axial bore 18 is in the outer region of the shaft journal

8 a central extension 25 into which a compensating coupling 19 is inserted with radial play. the Compensating coupling is designed according to FIG. 4 as a ring element 25, on the circumference of which two diametrically opposite, radial driver 30 are attached, which in a radial slot or correspondingly shaped recesses of the waves pin 8 engage positively. The radial slot or the correspondingly shaped recesses of the shaft journal have such an axial depth that the extension 25 used compensating coupling 19 with its ring element 26 and the drivers 30 are essentially flush with the face of the bearing eye in the plane of the centering flange 12 concludes. The axially opposite one by 90 ° on the circumference offset driver 31 of the compensating coupling 19 protrude into a slot 20 on the end face of the drive shaft (Camshaft 14) and are positively connected by this

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drove. Due to the compensating coupling and its radial and axial mobility, which is permitted within certain limits Displacements, in particular axial and / or angular displacement of the two shafts 8, 14, can be compensated for in a simple manner.

The lubricating oil for bearing lubrication and sealing of the vacuum pump is supplied through an axial bore 21 in the drive unit ¹ 1e 14 from the oil pump or through the in the vacuum vacuum generated by the pump. There is between the Drive shaft 14 and the shaft journal 8 of the vacuum pump a leak-free on the circumference by elastic radial sealing rings 22 sealed connecting tube 23 projecting into drive shaft 14 and shaft journal 8 is provided.

This connecting pipe has such a radial play inserted through the center of the compensating coupling 19 so that the compensating movements of the shafts do not be hindered.

The oil flow delivered in the shaft journal 8 is in the area of the bearing eye 7 is injected through a nozzle 24 into the axial bore 18 of the rotor 9. The nozzle 24 is, however, for the The supply of lubricating oil to the vacuum pump is not absolutely necessary. Further details relating to the connecting pipe 23 and the compensating clutch 19 will be referred to later FIGS. 3 and 4 are explained.

In addition to the outlet kidney 28 for the exhaust air and the excess lubricating oil, there is another one in the bottom of the housing according to FIG Relief bore? 9 provided. This is angularly offset from the outlet kidney and lies with respect to its Levels in the highest area of the pump, but their distance from the bearing eye 7 is smaller than the rotor radius, so that it is covered by the rotor face. The distance of the

Relief bore 29 from the bearing eye 7 and the radius on

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which are the axial bores 11 of the rotor 9, correspond to each other in such a way that the of the axial bores 11 lubricating oil absorbed by the rotor face without pressure via the relief bore 29 into the oil sump of the drive machine can flow back. This ensures that even at high speeds of the pump and heavy oil delivery, excess lubricating oil does not lead to an increase in the Drive power leads. The relief opening 29 can of course also as an elongated hole on the corresponding one Be formed radius of the axial recesses of the rotor 9.

Fig. 3a shows in a partial longitudinal section a detail of the Shaft connection in relation to Fig. 1 enlarged scale.

It can be seen from Fig. 3a that the shaft journal 8 on its end facing away from the rotor 9 has the central widening 25 for the axial bore 18 with a stepped diameter, in which the Rinc ^ lement 26 of the compensating coupling 19 with his meet in the radial slot of the shaft journal 8 the drivers 30 is used. The axially opposite the driver 31 engage in the slot 20 on the end face of the drive shaft 14 in a form-fitting manner. It is in Fig, 3a also to see that the compensating coupling 19 has a bore 32 in the axial seal, which in the ring element 26 a radial step 33 has. The connecting pipe 23 is through the bore 32 of the compensating coupling 19 in the central Axial bore 18 of the shaft journal 8 or 21 of the drive shaft 14 inserted sealingly (Radi al di cht rings 22) ,, wherein the insertion length through the radial step of the axial bore 18 is limited.

For captive fastening of the compensating coupling 19 on the shaft journal 8, the connecting tube 23 has an annular shoulder 34 in its longitudinal center, the outer diameter of which is slightly larger * than the smaller diameter of the bore 32 on the * radial step 33. On the other hand, at the end of the

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Connecting tube 23 has inserted a groove into which a spring ring 35 is loosely inserted, which spring ring 35 can be clipped into the radial groove 36 of the axial bore 18 of the shaft journal 8. ₍ The coupling intermediate piece is through the connecting pipe 23

'5 19 is thus fixed on the shaft journal 8 and has a ⁽ predeterminable axial mobility.

Fig. 3b shows a modified constructive solution in which . the lubricating oil as a free jet into the longitudinal bore 18 in the

f 1ö shaft journal 8 is injected. It is in the shaft journal 8 a short tube 23.1, which is funnel-shaped at the inlet is expanded in order to catch the oil jet emerging at an axial distance from the nozzle 37, firmly pressed in (press fit). The ring shoulder 34.1 has ati the inlet of the pipe 23.1 likewise the previously described function of interacting with the step 33 of the bore 32 in the compensating coupling 19 and to secure them captive, but with a predeterminable axial play on the shaft journal 8.

In an advantageous embodiment of the connecting pipe

23 or 23.1, this can be made of, in particular, thermoplastic plastic and inserted into the radial groove 36 of the

^fe axial bore 18 are clipped in the shaft journal.

The solution according to FIG. 3b is preferred when the lubricating oil from the bore 21 of the drive shaft 14 in excess, is supplied, since the oil not absorbed by the pipe 23.1

can flow freely off and back into the oil sump of the engine. At low speeds and low oil delivery, however, the oil jet in the funnel-shaped expansion The air entrained in the pipe 23.1 by the injector effect ensures that in the axial bore 18 of the rotor 9 and thus there is always a pressure of approx. 1 bar in the wing foot spaces 16 of the pump.

35

Figures 4a to 4c show the compensating coupling 19 in the top and side view as well as in the axial section according to the preceding description.

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REFERENCE CHARACTERISTICS

1 Pump housing 2 lid 3 Intake manifold 4th screws 5 Turning 6th Case back 7th Bearing eye 8th Shaft journal, rotor shaft 9 rotor 10 wing 11th Axial bore, recess 12th Centering flange 13th Housing of the internal combustion engine 14th Camshaft, drive shaft, driving shaft 15th Radial bore of the rotor under the wing root space 16 Wing root space 17th Coupling pin 18th centric axial bore 19th Compensating coupling, intermediate piece 20th slot 21 Axial bore of the camshaft, oil feed channel 22nd Radial seal 23 Connecting pipe, pipe 23.1 Tube with inlet funnel 24 jet 25th Extension of the centric axial bore in the Shaft journal 26th Ring element 27 Ring channel 28 Outlet kidney 29 Relief drilling 30th Driver, tooth 511 »f t · I ** ·
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31 driver, tooth

32 bore

33 radial step

34 Ring shoulder (Fig. 3a), collar 34.1 Ring shoulder (Fig. 3b), collar

35 spring washer

36 radial groove

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Claims (7)

Annex to the letter 'from' TB. 11j.i365e file number G 85 09. £ .05, "2,;,. ·." 0-1459 Gm claims 1. vane vacuum pump, especially for servo consumers such as brake boosters Or the like. On internal combustion engines, with an eccentrically mounted in a pump housing (1) Rotor (9) in which at least one pair of blades (10) is guided in slots, in which pump the rotor (9) is driven by a driving shaft (14) through a coupling (19) and the coupling is an intermediate piece (compensating coupling 19) provided with coupling teeth (30, 31), which on the one hand connects to the rotor shaft (8 ) and on the other hand is in positive, axial engagement with the driving shaft (14),
characterized featuring g e that Devices (tube 23) can be clamped axially with the rotor (9) and have a collar (ring shoulder 34) have, which limits the axial movement of the intermediate piece (19). 2. Pump according to claim 1, with the mark; The intermediate piece (19) is a circular cylindrical body with radial teeth; the rotor shaft (8) has a circular cylindrical shape at the front end Recess (25), the cylinder wall of which has radial slots, the intermediate piece (19) fitted into the cylindrical recess (25) and the radial teeth (30) in the radial slots with play are.
30th I Il I t I ■ * * * * * * »I Il * * · Il ill · · · ··· 0-1459 Gm - 2 - 3. Vane vacuum pump according to claim 2, features: ⁽ The intermediate piece (19) has on its free face '' flat teeth (31) that fit into a radial slot (20) • 5 of the driving shaft (14) engage. 4. Vane vacuum pump according to one of the preceding j. Expectations, \ Mark: I 10 The device is a pen with a collar (34), which penetrates the intermediate piece (19) and with a ί | free end in a corresponding bore (18) of the J The rotor shaft (8) can be clamped, preferably clipped in I is. '■ 15 ; « 5. Vane vacuum pump according to claim 4, j Mark: The intermediate piece (19) has a central bore (32) with a stepped diameter, the smaller diameter of which is 20 knife larger than the outside diameter of the pen, but j smaller than the outer diameter of the provided on the pin seen federal (34) is. 6. Vane vacuum pump according to claim 4 to 5, 25 characteristics: The pin is a pierced, central tube (23) that connects to the oil supply hole (21) in the driving shaft (14) aligns. 30th 7. Vane vacuum pump according to claim 6, features: The pin is an oil feed tube (23) which protrudes into the driving shaft (14) and the central I oil supply kaiial (21) inside the driving shaft with t 35 a central oil supply duct (18) inside the rotor shaft (8) connects _t «* M (I llll 4 · · * · * I «ι i t t * * * i ti llll I * · ♦ · • «Itil ti 4 I. • II · I · «*