DE102005026616A1 - Continuously variable automatic transmission unit, comprising lid integrated in converter housing and secured from outside - Google Patents

Abstract

The unit comprises several transmission shafts rotating in ball bearings (5) and accommodated in a converter housing (1) closed with a lid. The new design of a housing (1) is equipped with holding elements (2) made of sheet metal and positioned adjacent to the ball bearings (5). The holding elements (2) are provided with at least three extensions and can be secured after the unit is assembled with screws (18) guided through matching bores from outside the housing (1).

Description

The The present invention relates to an automatic transmission according to the preamble of claim 1. Furthermore, the invention relates to a method for mounting the variator of a continuously variable automatic transmission in the case.

automatic transmission comprise a housing, in which components of the transmission are arranged, in particular shafts, Switching elements, wheelsets, being for the case of continuously variable transmissions u.a. the variator and the hydraulics for variator adjustment in the housing are arranged.

at Automatic transmissions are known from the prior art that shafts the housing side, For example, are mounted by means of ball bearings, wherein the axial Securing the bearings and the shaft package by nuts or split Rings done. As part of the manufacturing process, the axial securing elements first from the outside be accessible, to allow the assembly. After mounting the retaining plates for axial securing of the bearings the nuts or split rings for axially securing the bearings as well as housing cover assembled. Due to the necessity of the lid for closing the housing proves the production of the housing as costly because et al many different components or components, for example Seals needed become.

The same problem also arises in the case of stepless Automatic transmissions, in particular stepless belt transmissions, as explained below becomes.

One stepless belt transmission is usually u.a. from one Starting unit, preferably a converter, a forward / reverse drive unit or a reversing set, an intermediate shaft, a differential hydraulic and electronic control devices as well as one Variator.

Of the Variator includes the prior art in such transmissions a primary page that is connected to the drive shaft and a secondary side, which each comprise paired conical disks. A the conical disks is fixed in the axial direction, the other being arranged axially displaceable. Furthermore is a variator with a torque-transmitting belt element provided, which circulates between the two cone pulley pairs. As wrapping element becomes common used a push belt, a pull chain or a belt. The current translation of the transmission is determined by the running radius of the belt which in turn defines a function of the axial position of the conical disks the primary or secondary side to each other.

The Variator shafts are usually the housing side mounted by means of ball bearings, the axial securing of the bearings and the wave packet or the variator waves by nuts or split rings takes place.

As part of the manufacturing process, the axial securing elements must first be accessible from the outside, to allow the assembly. Subsequently, the transmission is closed by a primary side and a secondary side can be arranged primary or secondary cover. These covers form a closed space to pass the disk or clutch pressure provided by a controller to the respective shafts. The lids have according to the prior art pressure supply for the oil of the oil pressure control circuit for Variatorverstellung. Housings comprising such covers are known in the art, for example from DE 103 36 741 A1 , well known.

at the assembly will be first the bearings in the housing pressed in and then mounted the retaining plates for axial securing of the bearing or with the housing connected before the variator of the transmission retracted into the housing becomes. Finally, the nuts or the split rings to axial securing of the bearings and the lid mounted.

By this housing structure conditionally, which the primary side and the secondary side can be arranged cover and the corresponding screws and seals requires proves, on the one hand, the production of the housing as costly, since u.a. many different components or Components needed become. On the other hand, this ensures easy installation, there the case after the assembly of the axial securing elements is closed.

From the US 5,478,284 a bearing arrangement for the shafts of a continuously variable transmission is known, which is axially secured by means of a connectable to the housing holding plate.

The retaining plate comprises a positioning pin, which is insertable into a bore of the housing, such that when the positioning pin is inserted into the bore of the housing, a bore of the retaining plate and a bore provided in the housing lie one above the other, so that a screwing of the housing with the Holding plate over these holes made possible from the outside becomes light. In this concept, the fact that only one screw or a bolt is provided for fastening the bearing or the retaining plate can be disadvantageous. Furthermore, a complex management of the hydraulic lines for Variatorverstellung is required.

From the JP 11153213 A a continuously variable transmission is known in which the bearing assembly of the variator is secured by a retaining plate which is connected by a bolt from the outside to the housing. Here, the bolt head is covered by a lid, in which a hydraulic line is provided. The fact that a cover is provided, the number of required components is disadvantageously not reduced.

Furthermore, from the EP 0 763 675 B1 a continuously variable automatic transmission with mounted in end walls primary and secondary shaft of a variator for continuously adjusting the gear ratio and with a transversely divided to the shafts of the variator housing, said primary and / or secondary shaft by a one-piece housing part, which on the side facing away from a drive unit of the transmission is hermetically sealed to the outside.

As part of the EP 0 763 675 B1 are arranged in a housing part bearings of primary and secondary shaft fixed to the interior of the housing part with retaining plates and fixed axially, the attachment of the retaining plates does not engage through the wall of the housing part.

Of the present invention is based on the object, a housing for an automatic transmission specify which, while retaining the ability to install is simple and possible has few components, so that reduced production costs become.

Of Another is a method for mounting the variator of a continuously variable Automatic transmission in the housing be specified.

These Task is according to the invention for an automatic transmission solved by the features of claim 1. A method of assembly the variator of a continuously variable transmission is in the housing Subject of claim 14. Further advantages and advantageous Embodiments will be apparent from the corresponding subclaims.

Therefore is proposed in an automatic transmission, the housing cover in the gearbox to integrate, which preferably designed as a ball bearing Bearing the housing side to be stored gear shafts over bolted to the housing Holding plates are secured axially. It is suggested here that the retaining plates have at least three tabs, which are provided by suitable means the mounting device, preferably formed as pins are so positioned that a screw with the casing from the outside allows becomes.

alternative It is proposed that the centering of the retaining plates for Purpose of assembly by an already existing transmission component, for example, by a part of a hydraulic cylinder or through the hub of a gear.

In the case a continuously variable automatic transmission comprising a variator is proposed to cover the primary and secondary side in the gearbox to integrate, which preferably designed as a ball bearing Bearings of variator shafts over with the housing bolted retaining plates are axially secured. Preferably an at least two-part housing used, which includes the converter bell (converter housing) and the actual transmission housing. According to the invention is the geometry of the pressure feeds for the Hydraulics of variator adjustment for the primary and secondary side simulated in the housing.

Of further it is envisaged that, if required by design is the geometry of the pressure feeds for operation imitated by switching elements of the reversal kit of the transmission in the housing is. For example, the geometry of the pressure supply for the actuation of the forward clutch in the housing part be simulated, which covers the storage of the primary shaft.

Of the Variator is in a first embodiment of the invention according to the invention thereby in the case mountable, that the holding plates have at least three tabs, the above suitable means of the mounting device, preferably as pins are formed, are positioned so that a screw with the housing from the outside allows becomes.

In the context of a particularly advantageous embodiment of the invention, it is proposed that the positioning or centering of the holding plates is formed by a variator disc or parts of the hydraulic cylinder. For example, on the primary side and / or the secondary side, the retaining plate can be adapted for centering on the curved surface contour of the hydraulic cylinder. It is also possible that on the primary and / or secondary side of a variator disc may have a circumferential shoulder whose radially outwardly facing surface with the cylindri rule inner contour of the retaining plate for centering or positioning cooperates. By this procedure eliminates the need for tabs in an advantageous manner.

The Centering of the retaining plates for The bearings can also be done on other transmission parts, for example on the hub of a gear.

• – Fixieren des Variators in der Montagevorrichtung;
• – Einlegen der Haltebleche, wobei die Haltebleche durch geeignete Mittel bzw. Stifte der Montagevorrichtung mittels der Laschen positioniert oder ohne Laschen und Haltestifte über Getriebeteile positioniert und an der Montagevorrichtung gehalten werden;
• – Aufpressen der Kugellager zur gehäuseseitigen Lagerung der Variatorwellen auf die Variatorwellen;
• – Montieren der Axialsicherung der Lager, welche als Mutter oder als geteilter Ring ausgebildet sein kann;
• – Montieren des Variators mit dem als Kette oder Band ausgebildeten Umschlingungselement;
• – Montieren des Pakets, umfassend Variator, Lager, Axialsicherungen und Haltebleche, in das Gehäuse und
• – Verschrauben der Haltebleche von außen mit dem Gehäuse.

Since the housing according to the invention is also closed on its rear side, a method for mounting the variator in the housing is proposed, which comprises the following steps:

• - Fixing the variator in the mounting device;
• - Inserting the retaining plates, wherein the retaining plates are positioned by suitable means or pins of the mounting device by means of the tabs or positioned without tabs and retaining pins on gear parts and held on the mounting device;
• - Pressing the ball bearings for housing side storage of Variatorwellen on the variator shafts;
• - mounting the axial securing of the bearings, which may be formed as a nut or as a split ring;
• - Mounting the variator with the trained as a chain or belt wrapping element;
• - Mounting the package, comprising variator, bearings, axial and retaining plates, in the housing and
• - Screwing the retaining plates from the outside with the housing.

Preferably each retaining plate with screws on the previous positions screwed.

By the concept according to the invention is omitted the two lids, the corresponding screws and the corresponding ones Gaskets, resulting in a significant reduction in cost will, without the functionality of the transmission. Furthermore, by integrating the Cover in the gearbox the gearbox against the required high pressures for Variator adjustment to the outside securely sealed and advantageously has a high strength on. In addition, the required space is reduced.

The Invention will be described below with reference to the accompanying figures with reference to a continuously variable Automatic transmission, comprising a variator, explained in more detail by way of example. In these represent:

1 a schematic sectional view of the variator of a continuously variable transmission according to a first embodiment of the invention prior to assembly in the housing;

2 a schematic sectional view of the variator of a continuously variable transmission according to 1 after mounting in the housing;

3 a schematic sectional view of the primary side of a variator of a continuously variable transmission according to a second embodiment of the invention and

4 a schematic sectional view of the secondary side of a variator of a continuously variable transmission according to another embodiment of the invention.

In 1 is the variator 9 a belt transmission, which is a primary side 11 and a secondary side 10 includes, each a cone pulley pair 13 respectively. 12 exhibit.

To store the variator shafts are ball bearings on the housing side 5 intended; Furthermore, the axial securing of the ball bearings takes place 5 and the wave packet through nuts 6 (see primary page) or split rings 7 (see secondary page). For axial fixation or securing of the bearings 5 are holding plates 2 provided, which are bolted to the housing. Altarnativ for screwing other known to the expert means can be used.

According to the invention become the functionality the lid known from the prior art, which has a closed Make room to accommodate the disk space provided by a controller. or to transfer the coupling pressure to the respective shafts or discs, taken from the housing, i.e. the lids are in the case integrated. To allow easy variator adjustment, is the geometry of the pressure feeds for the hydraulics the variator adjustment for the primary and secondary side in the case simulated.

The variator 9 is according to the invention characterized in the housing 1 mountable to the retaining plates 2 the storage 5 at least three tabs 3 have, via suitable means of the mounting device, preferably as retaining pins 4 are formed (see. 1 ), are positionable such that a screw with the housing 1 is made possible from the outside.

In 2 becomes the variator 9 after mounting in the housing 1 shown. The retaining plates 2 are by means of screws 8th with the housing 1 screwed.

As housing 1 Preferably, a two-part housing is used, which the converter housing 14 and the gearbox 15 includes.

By the one with the retaining pins 4 the mounting device cooperating tabs 3 becomes the mounting capability of the variator 9 in the case 1 ensured in a simple and cost-effective manner, as they allow a screw from the outside with the housing, so that the cover can be omitted without increased design effort.

As part of the in 3 and 4 shown particularly advantageous embodiment of the invention, the positioning or centering of the holding plates is effected by a variator disc or parts of the hydraulic cylinder.

3 illustrates the positioning or centering of the retaining plate 2 through parts of the hydraulic cylinder 16 , This is on the primary side 11 the retaining plate 2 for centering on the curved surface contour of the hydraulic cylinder 16 customized.

According to the invention, a variator disk 12 a circumferential paragraph 17 have, the radially outwardly facing surface with the cylindrical inner contour of the retaining plate 2 cooperates for centering. This solution is used in the embodiment according to 4 illustrates where the retaining plate 2 through a variator disc on the secondary side 10 is centered.

Of course, too any constructive training, especially any spatial Arrangement of the individual components per se and each other, and, as far as technically reasonable, under the scope of protection of the present Claims, without the function of the transmission, as stated in the claims is to influence, even if these training is not explicit are shown in the figures or in the description.

1

casing

2

Halteblech

3

flap

4

retaining pin

5

camp

6

mother

7

divided ring

8th

screw

9

variator

10

secondary side

11

primary

12

Conical pulley

13

Conical pulley

14

converter housing

15

gearbox

16

hydraulic cylinders

17

paragraph

Claims (14)

Automatic transmission, comprising shafts mounted in a housing, characterized in that the housing covers for closing the housing after the mounting of the retaining plates ( 2 ) for axially securing the bearings ( 5 ) of the waves in the housing ( 1 ), wherein the retaining plates ( 2 ) from the outside with the housing ( 1 ) are screwed. Automatic transmission according to claim 1, characterized in that the retaining plates ( 2 ) the storage ( 5 ) at least three tabs ( 3 ) by appropriate means ( 4 ) of the mounting device are positionable such that a screwing of the retaining plates ( 2 ) with the housing ( 1 ) is allowed from the outside. Automatic transmission according to claim 1, characterized in that the centering or positioning of the retaining plates ( 2 ) the storage ( 5 ) takes place by an already existing transmission component, so that a screwing of the retaining plates ( 2 ) with the housing ( 1 ) is allowed from the outside. Automatic transmission according to claim 3, characterized in that the centering or positioning of the retaining plates ( 2 ) the storage ( 5 ) takes place through a part of a hydraulic cylinder of the transmission or through the hub of a gear. Automatic transmission according to one of the preceding claims, which is designed as a continuously variable transmission, comprising a variator having a primary and a secondary side, wherein the bearings of the variator are axially secured by connectable to the housing holding plates, and a housing, characterized in that the lid , which form a closed space to pass the disk or clutch pressure provided by a control unit to the respective shafts, into the housing (FIG. 1 ), wherein the geometry of the pressure feeds for the hydraulics of the variator adjustment for the primary and secondary side ( 11 . 10 ) and, if required by design, the geometry of the pressure feeds for actuating switching elements of the reversing gear of the transmission in the housing ( 1 ), and wherein the retaining plates ( 2 ) from the outside with the housing ( 1 ) are screwed. Automatic transmission according to claim 5, characterized in that the variator ( 9 ) thereby into the housing ( 1 ) is mountable that the retaining plates ( 2 ) the storage ( 5 ) at least three tabs ( 3 ) by appropriate means ( 4 ) of the mounting device are positionable such that a screwing of the retaining plates ( 2 ) with the housing ( 1 ) is allowed from the outside. Automatic transmission according to claim 5, characterized in that the variator ( 9 ) thereby into the housing ( 1 ) is mountable that the centering or positioning of the retaining plates ( 2 ) the storage ( 5 ) by a variator disc or parts of the hydraulic cylinder ( 16 ) is formed. Automatic transmission according to claim 7, characterized in that on the primary side ( 11 ) and / or the secondary side ( 10 ) of the variator ( 9 ) the retaining plate ( 2 ) for centering on the curved surface contour of the hydraulic cylinder ( 16 ) is customizable. Automatic transmission according to claim 7 or 8, characterized in that on the primary side ( 11 ) and / or secondary side ( 10 ) of the variator ( 9 ) a variator disc has a peripheral shoulder ( 17 ), whose radially outwardly facing surface with the cylindrical inner contour of the retaining plate ( 2 ) cooperates for centering or positioning. Automatic transmission according to one of claims 5 to 9, characterized in that the housing ( 1 ) is designed as at least two-part housing, which the converter housing ( 14 ) and the transmission housing ( 15 ). Automatic transmission according to one of the preceding claims 5 to 10, characterized in that for the storage of the variator shafts on the housing side ball bearing ( 5 ) are provided. Automatic transmission according to one of the preceding claims 5 to 11, characterized in that the axial securing of the bearings ( 5 ) and the variator shafts through nuts ( 6 ) or split rings ( 7 ) he follows. Automatic transmission according to one of the preceding claims 5 to 12, characterized in that each retaining plate ( 2 ) with screws to the housing ( 1 ) is screwed from the outside. Method for mounting the variator of a stepless Automatic transmission, in particular a belt transmission, after one of claims 5 up to 13 in the case, characterized in that it comprises the following steps: