WO2015131894A1

WO2015131894A1 - Anti-vibration unit for an anti-vibration device

Info

Publication number: WO2015131894A1
Application number: PCT/DE2015/200088
Authority: WO
Inventors: Jan Grabenstätter
Original assignee: Schaeffler Technologies AG & Co. KG
Priority date: 2014-03-06
Filing date: 2015-02-20
Publication date: 2015-09-11
Also published as: DE112015001127A5

Abstract

The invention relates to an anti-vibration unit (1) for an anti-vibration device (2) of a friction clutch (3), which anti-vibration unit comprises at least the following components: an inlet (4) for a transmitting fluid (5), which inlet is connected to an outlet (6) in regard to flow, an axially displaceable sleeve (7) having at least one vibration opening (8), at least one inlet opening, and at least one outlet opening, and a preloading element (11) having a predetermined preloading force (12). The displaceable sleeve (7) presses against a sealing seat (13) by means of the preloading force (12) in a vibration state, and flow is possible only through the at least one vibration opening (8). In an open state, the preloading force (12) is overcome by an opposite incident flow, which closes the at least one vibration opening, and the sleeve is lifted off from the sealing seat. Flow through the at least one inlet opening is not possible in the vibration state and is possible in an open state. The anti-vibration unit is characterized in that the at least one inlet opening (9) forms a throttle (14) for an incident flow from the inlet (4) to the outlet (6).

Description

Tingling unit for a tingling filter

The invention relates to a tingling unit for a tingling filter, in particular for a tincture

hydraulic or pneumatic release of a friction clutch, preferably for a

Motor vehicle.

Kribbelfilter are known from the prior art, which are adapted to

Filter out vibrations, so that, for example, in a motor vehicle

Vibrations are not noticeably transmitted to the clutch pedal for the driver. For this example, a sealed with a lip of a flexible material

Used tingling, which must be traversed by a fluid, for example, a hydraulic fluid or a pneumatic gas when disengaging. At a sufficient applied pressure, the closing force of the flexible material

overcome, so that the flow is possible. By contrast, if the pressure is insufficient, the tingling opening remains closed or the lip closes the tingling opening again. This filters out the vibrations. When engaging, however, a sleeve on which the lip is mounted, pushed back against a spring force, whereby the sleeve is spaced from a sealing seat and thus a bypass channel is free. The lip is preferably set up so that it is closed by the rearward flow of the fluid or is at least supported in the closed position. In the sleeve, a return flow opening is provided, which can only be flowed through when the bypass channel is free. This is only when engaging the case, so a backward flow.

In the prior art, a so-called torque limiter (PTL = Peak Torque Limiter) is further known, in which a slidable throttle is provided, the

Engaging the speed of the fluid limited, but ensures the fastest possible runoff when disengaging. This is achieved in that the throttle has a plurality of passages, of which by means of the displacement of the throttle when engaging at least one is closed. As a result, throttled when engaging the flow. When disengaging, however, all the passages are free, so that the maximum

Flow rate is achieved. The displacement is assisted by the flow of the fluid.

In general, both elements described here are required, on the one hand the

Filter out vibrations and on the other to regulate an engagement process. On this basis, the present invention has the object, at least partially overcome the known from the prior art disadvantages. The object is solved by the features of the independent claims. Advantageous developments are the subject of the dependent claims.

The subject of the present invention is a tingling unit for a tingling filter of a friction clutch, which has at least the following components:

an input for a transmission fluid which is flow-connected to an output,

an axially displaceable sleeve with at least one tinging opening, at least one inlet opening and at least one outlet opening, and

a biasing element having a predetermined biasing force,

wherein the displaceable sleeve presses in a tinged state by means of the biasing force against a sealing seat and alone the at least one tingling opening can be flowed through, and wherein in an opening state, the biasing force by an opposite flow, which closes the at least one tinging, overcome and the sleeve from the sealing seat is, wherein the at least one input opening in the tingling condition is not

can flow through and can be flowed through in an open state.

The invention is characterized in that

the at least one inlet opening for an inflow from the input to the outlet forms a throttle.

The tingling unit is adapted to filter out vibrations in the hydraulic or pneumatic system with a transfer fluid, for example an oil or air, in particular when disengaging. For this purpose, a tingling opening is provided, which can only be flowed through at an applied minimum pressure. For example, the

Tingling opening with a flexible material, for example with a lip of one

Elastomer, formed. The input and the output can each be connected to a hydraulic or pneumatic line, so that the tingling unit is flown during operation. The sliding sleeve fills a flow-through cross-section, so that the

Transmission fluid must flow through the sleeve to get from the input to the output and vice versa. In a tingling condition, the sleeve is pressed against a sealing seat, whereby alone the tingling orifice can be flowed through freely or with a

flow-through connection channel between input and output is connected. The sleeve is pressed against the sealing seat by the biasing element, for example a spring, preferably a helical spring. The seal is preferably formed by the Kribbelöffnung forming material. In the reverse flow case, the tingling opening

closed and the applied pressure of the transmission fluid drives the sleeve against the Biasing force towards the outlet so that the sleeve is lifted off the sealing seat. The tingling unit is thus transferred into an opening state and thus the flow through the at least one inlet opening is free.

The at least one input opening is designed as a throttle, the one

Speed drop and pressure drop causes. Thus, the tingling in the

Opening state to a torque limiter. This throttle is designed to prevent excessive (dynamic) pressure drops, so that on the one hand the hydraulic or pneumatic elements are not damaged and on the other hand

Connected slave cylinder or master cylinder damage any adjacent components, for example, in a friction clutch thereby abrupt switching behavior of the friction clutch is prevented. For example, this torque limitation allows the slave cylinder, against the switching force of the master cylinder, slowed down engage and thus prevent a sudden application of excessive torque in a friction clutch. This process can occur jerkily, so the ensuing

Speed of the transmission fluid to be reduced via the throttle.

With this tingling unit, an additional component, which is the

Torque limitation carried out, saved.

According to a further advantageous embodiment of the tingling unit, the throttle is formed by means of a diaphragm.

The embodiment of the throttle as a diaphragm or as a plurality of diaphragms is a particularly simple embodiment that can be easily integrated into a known tingling unit. A diaphragm is characterized above all by its sharp-edged outlet, which is suitable for turbulent flow change and / or turbulence in the air

Transmission fluid provides. This creates a stagnation and flow slowdown. Sharp-edgedness can be produced in any imaginable way. Particularly advantageously, this is achieved by an abrupt flat cross-sectional widening, wherein preferably the flow deposit of the narrowest cross-section is designed as short as possible. The length of the narrowest cross-section is preferably determined by the strength values of the diaphragm material used or by the manufacturing effort. For example, the length is less than 2 mm [millimeter] or even less than 0.5 mm.

According to a further advantageous embodiment of the tingling unit, the at least one inlet opening towards the inlet forms a flow funnel. The flow funnel is set up for gentle transfer of the flow into the throttle. For this purpose, the inlet opening of the flow funnel is preferably directed towards the flow path. For example, in the case of a transverse inflow of the inflowing transmission fluid, the inlet opening is offset with an enlarged diameter with respect to the outlet opening of the throttle and forms an inclined transition surface to the outlet opening. The

Outlet opening here refers to the portion of the throttle, which has the smallest diameter. For an orifice, this is the actual exit, while for most other throttle configurations, the exit orifice is located inboard, for example, in the center of the throat area.

According to a further advantageous embodiment of the tinging unit, at least one of the inlet openings has an outlet oriented transversely to the main flow direction.

By this arrangement of the outlet, a further flow deflection is necessary, which has an additional throttle effect. In addition, a tidal flow is achieved in the tingling condition which causes only a small exchange after the Prandtl flow effect (static pressure compensation) and thus does not affect the tingling condition to the contrary by generating an overpressure in a side channel between the at least one inlet opening and the sealing seat.

According to a further aspect of the invention, a Kribbelfilter for a hydraulic or pneumatic release is proposed, which has at least one of the following components:

a tingling unit as described above,

a housing for receiving the tingling unit with at least one

Latching connection element, wherein the housing by means of at least one

Detent connection element on the input side and / or output side with a

Connecting line of a releaser is connectable.

The Kribbelfilter is easily integrated by means of the housing in a hydraulic or pneumatic system. In addition, a torque limiter (PTL) is saved. The locking connection allows a secure and tight connection with conventional pegs of a connecting line.

According to a further aspect of the invention, a hydraulic or pneumatic release for a friction clutch is proposed, which at least the following

Components comprising:

a master piston in a master cylinder; at least one slave piston in a slave cylinder configured to act on a friction pack of a friction clutch;

a connecting line between the master cylinder and the at least one slave cylinder for a transfer fluid,

in which a Kribbelfilter according to the above description is arranged in the connecting line, so that in a first flow direction, the tinging acts as Kribbelfilter and acts in an opposite second flow direction, the inlet opening as a pressure reducer.

This releaser separates the friction partners of a friction pack of a friction clutch, so that a torque transmission is disconnected. For this purpose, the releaser on a slave cylinder, which acts on the friction pack and also a master cylinder, which generates the desired switching force. Between the slave cylinder and the master cylinder is a

Kribbeleinheit or a Kribbelfilter provided according to the above description, so that when disengaging vibrations are filtered in the transfer fluid and when engaging the volume flow (when flowing backward) is limited. If the master cylinder presents an increased pressure during engagement, there is a positive pressure gradient from the outlet to the inlet. As a result, the sleeve is spaced from the sealing seat and the tinging is closed and the inlet openings are by Ström bar. If, on the other hand, there is a negative pressure, that is to say at the inlet or the slave cylinder, there is an increased pressure relative to the outlet or the master cylinder, the sleeve will remain on the sealing seat due to the biasing element or will return to this position. Thus, with a component a Kribbelfilter and a

Torque limit reached.

According to another aspect of the invention is a friction clutch with a

Rotary axis for releasably connecting an output shaft proposed with a drive train, which has at least the following components:

at least one friction pack, wherein a torque can be transmitted via the at least one friction pack in the pressed-on state;

a hydraulic or pneumatic release according to the above description, via which the at least one friction pack is actuated.

The friction clutch is adapted to releasably transfer torque from an output shaft to a drive train and vice versa. This is generally achieved by way of the at least one friction pack, which has an axially displaceable pressure plate which is rotationally fixed, as a rule, with the output shaft and which bears against at least one corresponding friction disc can be pressed and then transmit a torque. The force is generated by an actuating system which is actuated directly or indirectly by a user. From this actuation system, the force goes out, which leads to an axial compression of the at least one Reibpakets. Particularly preferably, the actuating system is arranged hydraulically or pneumatically, whereby particularly large axial forces can be generated and a transmission ratio is easily adjustable. In a normally engaged friction clutch with a releaser, the contact pressure is generated by a (plate) spring. The engagement force must be overcome by a release. Therefore, the release force must be high. This is achieved in particular by a hydraulic release in a space-saving manner. Due to the high applied forces, vibrations in the system are noticeable to the user of the clutch. In addition, too fast engagement can lead to excessive wear on the friction linings of the friction clutch. With the releaser proposed here a gentle and pleasant operation of the friction clutch is possible, at the same time only a single integral component, namely the Kribbelfilter must be used.

According to a further aspect of the invention, a motor vehicle is proposed, which has a drive unit with an output shaft, a drive train and a

Has friction clutch according to the above description for releasably connecting the output shaft to the drive train.

Most motor vehicles today have a front-wheel drive and therefore preferably arrange the drive unit, for example an internal combustion engine or an electric motor, in front of the driver's cab and transversely to the main drive direction. The space is particularly small in such an arrangement and it is therefore particularly advantageous to use a friction clutch small size.

The installation space situation for passenger cars of the small car class according to European classification is exacerbated. The units used in a passenger car of the small car class are not significantly reduced compared to passenger cars larger car classes. Nevertheless, the available space for small cars is much smaller. With the friction clutch proposed here, a high torque can be transmitted in a small space, wherein at the same time takes place with an integral Kribbeleinheit a torque limiter and vibration filtering.

Passenger cars are classified according to a vehicle class according to, for example, size, price, weight, power, this definition being a constant change according to the

Market needs. In the US market will be vehicles of the class small car and micro cars are classified according to European classification of the class of the Subcompact Car and in the British market they correspond to the class Supermini for example of the class City Car. Examples of the micro car class are a Volkswagen Fox or a Renault Twingo. Examples of the small car class are an Alfa Romeo Mito, Volkswagen Polo, Ford Fiesta or Renault Clio.

The features listed individually in the claims can be combined with each other in any technologically meaningful manner and can be supplemented by explanatory facts from the description and details of the figures, with further

Embodiments of the invention will be 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. Show it:

1: a Kribbelfilter first flow direction,

2 shows a Kribbelfilter second flow direction,

3: a release with friction clutch,

Fig. 4: a motor vehicle with friction clutch.

Fig. 1 shows a Kribbelfilter 2 with a tingling unit 1, wherein these in a first

Flow direction 28 is flowed through by a transfer fluid 5. The sleeve 7 with the tinging 8 and the inlet opening 9, which is designed as a throttle 14 is pressed by the flow direction 28 and the biasing member 1 1 and its biasing force 12 to the sealing seat 13. Thus, only the tingling opening 8 is free and filters out the vibrations of the transfer fluid 5 before it enters the entrance 4. Coming from the outlet 6, the transfer fluid 5 flows through the outlet opening 10 into the sleeve 7 and passes laterally the inlet opening 9 lying transversely to the flow direction 28 and flows through this only to equalize the pressure up to the sealing seat 13. The features of the inlet opening 9 are described with reference to FIGS 2 explained in more detail. By means of the first

Locking receptacle 20 and the second latching receptacle 21, the housing of the Kribbelfilters 2 simply in a connecting line 22 (see FIG. 3) can be integrated. Another component for torque limitation is eliminated. FIG. 2 shows the tingling filter 2 according to FIG. 1, the tinged filter 2 being flowed by the transfer fluid 5 here in the reverse, second flow direction 29. The sleeve 7 is now spaced from the sealing seat 13, so that the flow to the inlet opening 9 is free. The tingling opening 8 is closed or at least provides a high

Flow resistance is through the funnel opening 16, the input port 9 flows gently and occurs at the aperture 15 formed as a sharp-edged outlet 17 transversely to the main flow direction throttled. As soon as the flow direction reverses again, the sleeve 7 is again guided into the sealing seat 13, as shown in FIG. It should be noted that the number of openings is customizable and limited only by the simplified representation of each one.

In Fig. 3, a friction clutch 3 is shown, the friction pack 27 can be actuated via a releaser 18 with a Kribbelfilter 2, so that a voltage applied to the output shaft 31

Torque during rotation about the axis of rotation 30 releasably transferable to a transmission shaft 39. The friction clutch 3 can also be designed, for example, as a double clutch. About a plate spring 38, the friction pack 27 is pressed. By means of a slave piston 25 of the releaser 18, the friction pack 27 is released. The slave piston 25 is moved in the slave cylinder 26 via a transfer fluid, for example oil or air. The

Ubertragungsfluid 5 passes a Kribbelfilter 2 via a connecting line 22, when by means of the clutch pedal 40, the master piston 23, the transmission fluid 5 from the master cylinder 24 pushes. Vibrations when disengaging and excessive speeds when engaging are prevented by the Kribbelfilter 2.

FIG. 4 shows a motor vehicle 33 with a drive unit 34, which is arranged with its motor axis 37 transversely to the longitudinal axis 36 in front of the driver's cab 35. The

Drive unit 34 is shown here as an internal combustion engine, which has an output shaft 31 by means of a friction clutch 3, a rotation axis 30 in alignment with the motor axis 37, is connected to a drive train 32 shown here purely schematically.

With the invention proposed here, an additional torque limiter is saved and solved this task integrally by means of the Kribbelfilters. Tear List Unit

Anti vibration

friction clutch

entrance

transmission fluid

output

shell

Kribbelöffnung

entrance opening

output port

biasing member

preload force

sealing seat

throttle

cover

flow funnel

outlet

releaser

casing

first latching connection element

second latching connection element

connecting line

master piston

Master cylinder

slave piston

slave cylinder

Reibpaket

first flow direction

second flow direction Rotary axis Output shaft Drive train Motor vehicle Drive unit Driver's cab Longitudinal axis Motor shaft Disc spring Transmission shaft Clutch pedal

Claims

claims

1 . A tapping unit (1) for a tipping filter (2) of a friction clutch (3), comprising at least the following components:

an inlet (4) for a transmission fluid (5) fluidly connected to an outlet (6),

an axially displaceable sleeve (7) having at least one tingling opening (8), at least one inlet opening (9) and at least one outlet opening (10), and a biasing element (11) having a predetermined biasing force (12), the sliding sleeve (7 ) in a tingling condition by means of

Biasing force (12) against a sealing seat (13) presses and alone the at least one Kribbelöffnung (8) can be flowed through, and wherein in an open state, the biasing force (12) by an opposing flow, which closes the at least one tingling opening (8) is overcome and the sleeve (7) is lifted off the sealing seat (13), wherein the at least one inlet opening (9) can not be flowed through in the tingling condition and can be flowed through in an opening state.

characterized in that

the at least one inlet opening (9) for an inflow from the inlet (4) to the outlet (6) forms a throttle (14).

2. tingle unit (1) according to claim 1, wherein the throttle (14) by means of a diaphragm (15) is formed.

3. tingle unit (1) according to claim 1 or 2, wherein the at least one

Entrance opening (9) towards the input (4) forms a flow funnel (16).

4. tingle unit (1) according to any one of the preceding claims, wherein at least one of the inlet openings (9) has a transverse to the main flow direction aligned outlet (17).

5. Kribbelfilter (2) for a hydraulic or pneumatic release (18),

comprising at least one of the following components:

a tingling unit (1) according to one of the preceding claims, a housing (19) for receiving the tingling unit (1) with at least one latching connection element (20, 21), wherein the housing (19) is at least one of a latching connection element (20,21) on the input side and / or output side with a connecting line (22) of a releaser (18) is connectable.

6. Hydraulic or pneumatic release device (18) for a friction clutch (3),

comprising at least the following components:

a master piston (23) in a master cylinder (24);

at least one slave piston (25) in a slave cylinder (26) adapted to act on a friction pack (27) of a friction clutch (3);

a connecting line (22) between the master cylinder (24) and the at least one slave cylinder (26) for a transfer fluid (5),

characterized in that

a Kribbelfilter (2) is arranged according to claim 5 in the connecting line (22), so that in a first flow direction (28) the Kribbelöffnung (8) acts as Kribbelfilter and in an opposite second flow direction (29) the

Input opening (9) acts as a pressure reducer.

7. friction clutch (3) having an axis of rotation (30) for releasably connecting a

Output shaft (31) with a drive train (32), comprising at least the following components:

at least one friction pack (27), wherein a torque can be transmitted via the at least one friction pack (27) in the pressed-on state;

a hydraulic or pneumatic release device (18) according to claim 6, via which the at least one friction pack (27) can be actuated.

8. Motor vehicle (33) comprising a drive unit (34) having an output shaft (31), a drive train (32) and a friction clutch (3) according to claim 7.