DE102011005504A1 - Disc switching element for automatic transmission of motor vehicle, has hub arranged corresponding to holes of pressure equalization chamber so that cooling oil is directly passed into chamber for refrigeration of switching element - Google Patents

Abstract

The element (1) has a piston (3) that is inserted axially in the near side of a pressure equalization chamber (10). An oil guide plate (7) is radially arranged in the outer side of the piston and moved according to sliding movement of the piston. The piston and guide plate are arranged such that an oil supply space is formed to supply cooling oil to radially inward or outward direction. A hub (15) is positioned in parallel to guide plate corresponding to holes (16,17) of the chamber so that cooling oil is directly passed into the chamber for refrigeration of the element.

Description

The present invention relates to a plate switching element, in particular to a plate switching element of an automatic transmission according to the preamble of patent claim 1.

From the prior art it is known to realize a cooling oil supply according to need by means of a separate oil supply and an additional control valve for cooling of louver switching elements, resulting in disadvantageous manner in high manufacturing and assembly costs and in an increased space requirement. Furthermore, it is known from the prior art to realize the cooling oil supply of a multi-plate clutch directly via the clutch stroke, with the disadvantage that the clutch can not be re-cooled after opening, as the retracting piston shoots the cooling oil line.

Concepts for cooling lamellae switching elements, which have both the subject of a direct Kolbenhubbetätigung the cooling oil supply and the possibility of aftercooling, require a very complex and filigree design and are therefore expensive, space-consuming and lacking robust.

From the DE 10 2005 007 686 A1 the Applicant is a cooling oil supply for a wet-running switching or starting element known, comprising means which, upon actuation of the switching or starting element on the operating pressure against the force of a spring element or against the cooling oil pressure at least one through hole of a radially considered between one within the switching - or Anfahrelementes provided. Shaft and the disk set arranged component with at least one corresponding, provided on the shaft and connected to a cooling oil passage through hole in coverage, whereby the cooling oil supply is released to the disk set of the switching or starting element.

Furthermore, from the US 3,823,802 a not dynamically pressure balanced multi-plate clutch is known in which the cooling oil flow is controlled and released via the axial movement of the piston.

The US 2004/0154894 A1 describes a dynamic pressure balanced multi-plate clutch with controlled cooling oil flow, in which the cross section of an annular channel, via which the cooling oil is conveyed into a region radially below the disk pack, is changed by the clutch piston. Here, the pressure compensation chamber of the multi-plate clutch is supplied via a separate cooling oil line; the oil flow for cooling the coupling has no effect on the filling of the pressure compensation chamber.

The present invention has for its object to provide a blade switching element, which only in case of need, d. H. is supplied during the closing operation or in the closed state with cooling oil without the need for additional oil supply and an additional control valve, so that in the open state, the drag torque by targeted routing of the cooling oil of the. Slats are reduced. Furthermore, aftercooling of the re-opening switching element should be made possible. Furthermore, a compact design should be achieved with low manufacturing and assembly costs.

This object is solved by the features of patent claim 1. Further embodiments and advantages of the invention will become apparent from the dependent claims.

Accordingly, a lamellae switching element is proposed, with a piston for actuating the lamellae switching element, on the axial side facing away from the pressure chamber of the piston side a Ölleitblech is arranged, which forms the piston near side of the pressure compensation chamber of the lamellae switching element, wherein the radially inner end of the Ölleitbleches forms an oil separation edge , which conducts the inflowing oil into the pressure equalization chamber with the switching element open.

The radially outer side and the axially remote piston side of the pressure compensation chamber are preferably formed by a baffle plate; Preferably, the radially outer end of the Ölleitblechs considered radially abuts the outer side of the pressure compensation chamber or the baffle plate and can slide along this side or along the baffle plate in the axial direction according to the axial movement of the piston.

The piston and the Ölleitblech are designed such that axially considered between the piston and the Ölleitblech a space is formed, which serves as an oil reservoir in oil supply and can be passed over the cooling oil from radially inside to radially outward into the disk set, the outflow volume less than the inflow volume is.

Further provided for oil supply of the lamellar switching element, two in the hub of the lamellar switching element, preferably arranged parallel to each other bores or groups of holes, the axially considered the baffle plate or the piston remote side of the pressure compensation chamber nearest hole or hole group the cooling oil always directly into the Pressure equalization room directs and the further Hole or hole group as a function of the axial position of the piston and thus the oil separation edge of the cooling oil with open lamellae switching element in the pressure compensation chamber and when closed. Slat switching element for cooling the plate pack in the space between the. Piston and the oil baffle leads, which serves as a Ölstaubecken.

Due to the conception according to the invention, the oil flowing in via the two bores or groups of bores is conducted in a closed switching element for cooling the switching element and for simultaneous continuous filling of the pressure compensation chamber, depending on the axial position of the piston of the lamellae switching element.

When the switching element is open, the oil is led via both bores or bore groups directly into the pressure compensation chamber, which enables a very fast filling. This leads to an improvement in the response and the controllability of the switching element after the start of the drive unit and thus to an increase in shifting comfort.

At the same time, when the switching element is closed, cooling oil is conducted into the oil stub corners formed by the piston and the oil guide plate, which oil is further emptied after the switching element has been opened, thus allowing the switching element to be re-cooled.

Thus, a lamellar switching element is provided which allows a high functional benefit at relatively low overall additional costs and small space increases compared to lamella switching elements according to the prior art.

The fact that according to the invention, no separate oil supply for demand lubrication and cooling of the lamellar switching element is required, reduced in an advantageous manner, the circulating oil flow within the transmission, which has a very positive effect on the transmission efficiency and on the cost.

Another advantage of the construction of the lamellar switching element according to the invention is that with increasing wear or deformation of components of the switching element, the functionality is not affected, since an increased clutch stroke, the overlap of the oil separation edge to the holes, the closed-element switching the oil in the room conduct between the piston and the Ölleitblech, increases and thus leads to an even clearer separation of the flow paths.

The invention will be explained in more detail below by way of example with reference to the attached figures. Show it:

1 : A schematic sectional view of an embodiment of a running according to the invention fin element switching element;

2 : A sectional view taken along the line AA 1 ;

3 FIG. 2 is a schematic sectional view of an embodiment of a blade switching element according to the invention in the opened state for illustrating the flow paths of the oil; FIG. and

4 FIG. 2: a schematic sectional view of an embodiment of a lamellae switching element according to the invention in the closed state to illustrate the flow paths of the oil. FIG.

Slat switching elements are well known to those skilled in the art, so that in the description of the figures, only the components relevant to the invention are described and explained.

In 1 is a hydraulically actuated lamellar switching element 1 a transmission of a motor vehicle, comprising a disk pack 2 and one by hydraulic pressure against the force of a spring element 4 axially displaceably arranged piston 3 , The supply of hydraulic fluid for actuating the piston 3 is with the reference numeral 5 Mistake.

According to the invention is on the axially considered the pressure chamber 6 opposite side of the piston 3 an oil baffle 7 Arranged over throats 8th with the piston 3 connected, preferably KE-welded, is. Referring to 2 are between the punches 8th Ölleitnutungen distributed over the circumference 9 provided so that an oil flow viewed radially from the inside out to cool the plate pack 2 is possible.

The oil baffle 7 forms the piston near side of the pressure equalization chamber 10 of the lamellar switching element 1 , wherein the radially outer side and the axially remote piston side of the pressure compensation chamber 10 through a baffle plate 11 be formed. The radially outer end 12 of the oil deflector 7 lies in the example shown on the baffle plate 11 and can according to the movement of the piston 3 along the baffle plate 11 slide in the axial direction, wherein the radially inner end of the Ölleitbleches considered 7 an oil separation edge 13 forms, with the switching element open the inflowing oil into the surge tank 10 passes. In 1 is with the reference numeral 20 a seal called.

The piston 3 and the oil baffle 7 are designed such that, viewed axially, between the piston 3 and the oil baffle 7 a room 14 is formed, which serves as Ölstaubecken at oil supply and on the cooling oil from radially inward through the Ölleitnutungen 9 radially outward into the disk pack 2 can be directed; the outflow volume is less than the inflow volume.

How out 2 can be seen, are for oil supply of the lamellar switching element 1 two in the hub 15 of the lamellar switching element 1 introduced, arranged parallel to each other holes 16 . 17 provided, wherein the axially considered the baffle plate 11 nearest hole 16 the cooling oil regardless of the axial position of the piston 3 and thus the oil separation edge 13 always directly into the pressure equalization room 10 passes.

The further drilling 17 conducts depending on the axial position of the piston 3 and thus the oil separation edge 13 the cooling oil with open lamellar switching element 1 in the pressure equalization room 10 and with closed lamellar switching element 1 for cooling the plate pack 2 in the room 14 between the piston 3 and the oil baffle 7 which serves as an oil-dust corner.

This is based on the detail view in the right part of the 1 illustrated by the reference numeral 13 the oil separation edge with the lamellae switching element open and with the reference numeral 13 ' the oil separation edge is designated with a closed plate switching element.

At the in 1 shown example, the piston 3 a turn 18 for Ölabschleuderung on; Furthermore, an oil dam 19 be provided to optimize the distribution of the oil to the slats.

Subject of the 3 is the distribution of the incoming oil with the lamellae switching element open, the flow paths being illustrated by the arrows. With open switching element 1 the oil is over both holes 16 . 17 directly into the pressure equalization room 10 passed, whereby a very fast filling is made possible and an improvement in the response and the controllability of the switching element is achieved after the start of the drive unit.

Referring to 4 is when the switching element is closed 1 that through the hole 17 flowing oil in through the piston 3 and the oil baffle 7 formed Ölstaubecken 14 passed, with a portion of the oil from the radially inward through the Ölleitnutungen 9 radially outward into the disk pack 2 is directed. Since the outflow volume is less than the inflow volume, the oil debris basin empties 14 after opening the switching element 1 further and thus advantageously enables aftercooling of the switching element 1 ,

The division of the incoming oil with the switching element closed 1 between the pressure compensation room 10 and the oil dust corner 14 can be about the number and / or the diameter of the holes 16 . 17 respectively.

LIST OF REFERENCE NUMBERS

1

Slats switching element

2

disk pack

3

piston

4

spring elements

5

feed

6

pressure chamber

7

Ölleitblech

8th

by position

9

Ölleitnutung

10

Pressure equalization chamber

11

baffle plate

12

outer end 12 of the oil deflector 7

13

Oil separation edge

13 '

Oil separation edge

14

Oil reservoirs

15

hub

16

drilling

17

drilling

18

recess

19

oil dam

20

poetry

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

• DE 102005007686 A1 [0004]
• US 3823802 [0005]
• US 2004/0154894 A1 [0006]

Claims (5)

Slat switching element ( 1 ), characterized in that viewed axially from the pressure chamber ( 6 ) side facing away from the piston ( 3 ) for actuating the lamellar switching element ( 1 ) an oil guide plate ( 7 ), which is the piston-near side of the pressure compensation chamber ( 10 ) of the lamellar switching element ( 1 ), wherein the radially inner end of the Ölleitbleches ( 7 ) an oil separation edge ( 13 ), which with open lamellar switching element ( 1 ) the inflowing oil into the pressure equalization chamber ( 10 ) and with closed lamellar switching element ( 1 ) a part of the inflowing oil in an axially viewed between the piston ( 3 ) and the oil guide plate ( 7 ) space ( 14 ), which serves as a Ölstaubecken and via the cooling oil from radially inward to radially outward into the disk set ( 2 ) of the lamellar switching element ( 1 ), where the space ( 14 ) after opening the switching element ( 1 ) is further emptied and thus an aftercooling of the switching element ( 1 ), wherein with closed lamellar switching element ( 1 ) the outflow volume is less than the inflow volume into the room ( 14 ) and wherein the oil supply of the lamellar switching element ( 1 ) two in the hub ( 15 ) of the lamellar switching element ( 1 ) bores ( 16 . 17 ) or hole groups are provided, wherein the axially considered the piston distant side of the pressure compensation chamber ( 10 ) closest hole ( 16 ) or hole group the cooling oil always directly into the pressure equalization chamber ( 10 ) and the further drilling ( 17 ) or Bohrungsgruppe depending on the axial position of the piston ( 3 ) and thus the oil separation edge ( 13 ) the cooling oil with open lamellar switching element ( 1 ) into the pressure equalization room ( 10 ) and with closed lamellar switching element ( 1 ) for cooling the disk pack ( 2 ) in the. Space ( 14 ) between the piston ( 3 ) and the oil guide plate ( 7 ). Slat switching element ( 1 ) according to claim 1, characterized in that the Ölleitblech ( 7 ) about enforcements ( 8th ) with the piston ( 3 ), between the positions ( 8th ) distributed over the circumference Ölleitnutungen ( 9 ) are provided so that an oil flow viewed radially from the inside to the outside for cooling the plate pack ( 2 ). Slat switching element ( 1 ) according to claim 2, characterized in that the connection between the oil guide plate ( 7 ) and pistons ( 3 ) is cohesive. Slat switching element ( 1 ) according to claim 1, 2 or 3, characterized in that the radially outer side and viewed axially from the piston remote side of the pressure compensation chamber ( 10 ) of the lamellar switching element ( 1 ) through a baffle plate ( 11 ) are formed, wherein the radially outer end ( 12 ) of the oil guide plate ( 7 ) on the baffle plate ( 11 ) and according to the movement of the piston ( 3 ) along the baffle plate ( 11 ) can slide in the axial direction. Slat switching element ( 1 ) according to one of claims 1 to 4, characterized in that the division of the incoming oil with closed lamellar switching element ( 1 ) between the pressure equalization space ( 10 ) and the oil reservoir ( 14 ) about the number and / or the diameter of the holes ( 16 . 17 ) he follows.

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