KR100300191B1 - Hydraulic Torque Converter Stator_ - Google Patents

Abstract

The stator for the hydraulic torque converter is designed with a stator hub, the stator hub at least partially radially enclosing the freewheel outer ring along the axial extension for the radial bearing, at least one of which is axially opposite the freewheel outer ring. It has an axial protrusion projecting on it. An axial bearing is also formed to axially position the stator with respect to the converter housing, the axial bearing being effectively connected to at least the freewheel outer ring on one side and the converter housing on the other. . The axial protrusions have fasteners distributed circumferentially with one another at predetermined angular intervals, the fasteners projecting over the inside of the stator hub and centering at least the axial bearing through their radial inwards.

Description

Stator for hydraulic torque converter

The present invention relates to a stator for a hydraulic torque converter according to the preamble of claim 1.

Such stators are known, for example, via DE 44 23 640 A1, in particular in FIG. 1. This stator is arranged on the freewheel outer ring of the freewheel and radially surrounds the entire axial extension of the freewheel outer ring. A nose is formed on the axial protrusion protruding in the axial direction from both sides of the freewheel outer ring, and the nose protrudes radially inward, and the nose is directed toward the freewheel outer ring on both sides of the freewheel so that the freewheel of the freewheel outer ring is free. This prevents axial relative movement of the hub.

The freewheel outer ring, which extends over the freewheel inner ring on the hollow shaft mounted between the clamp body and the driving shaft and the converter housing, allows the center of the pressure pad to be in addition to radially centering the stator. Also used to align, the pressure pad is supported on an axial bearing in an axial direction on the pump shell of the converter housing on one side adjacent to the freewheel outer ring. The freewheel outer ring and the stator are axially positioned relative to the converter housing on one side by the axial bearing, while the stator is fixed by a second axial bearing on the opposite side in the axial direction.

Since the freewheel outer ring functions to center not only the stator but also the thrust collar, it has proved to be a problem in the centering of the thrust collar, in particular. This is because centering is made with a relatively small radial diameter in a very narrow space of the torque converter. Usually the thrust collar itself refers to a die casting part which exhibits a relatively high organizational structure. This is because the thrust collar must have an axial shoulder to axially engage the freewheel on one side to center, and on the other hand to center the axial bearing. In addition, the complex design of the thrust collar results in an excessively large structural width within the radially inner region where the assembly space is very narrow.

It is an object of the present invention to design the stator in the area of the hub so that the stator can be centered with respect to the freewheel using as little assembly cost and axial space as possible, as well as the pressure pad or the axial bearing. To ensure that

The object of the invention is achieved by the features set forth in the characterizing part of claim 1.

The stator hub is fixed in the area of the axial protrusion with a thin wall thickness by forming a stator distributed on the circumference with a predetermined angular interval with the axial protrusion projecting axially with respect to the freewheel outer ring. It can be manufactured on both sides of the device, respectively, which is particularly desirable when designing the stator and the stator hub from thermoplastic material due to better manufacturability, but on the other hand, it has sufficient deformation stiffness within the fixture area. Therefore, the fixing device can at least center the axial bearing through the radially inner side. To this end, the fixing device projects radially inwards through the radially inner side over the neighboring area on the circumferential side of the stator hub and receives the axial bearing on a predetermined point along the diameter. The holding device can be designed integrally with the neighboring axial protrusion of the stator hub to prevent radially high deformation stiffness of the axial bearing, but according to one of the following claims, the axial direction facing the stator hub. An end portion may be rigidly connected with the stator hub, or may be extended at a predetermined distance from the radially inner side of the stator hub. The fixing device thereby exhibits elasticity in the centrifugal direction, which makes it possible to expect optimum results, especially when using elastic materials. Due to this embodiment of the fixing device, the axial bearing and, if necessary, the pressure pad interacting with it can be fastened radially tightly through the fixing device, thus simply connecting the stator hub, pressure pad and the axial bearing. Force-closed connections can be made without the need for a form closure to prevent rotation. In addition, a radial protrusion may be formed on the pressure pad such that two of them are circumferentially engaged with both sides of the fixing device, respectively, so that the pressure pad and the stator hub do not rotate with each other. .

In the above mentioned fastening device, when the stator is produced by injection molding using, for example, a thermoplastic material, other functions obtained in the production of the stator may be designated. This requires a die comprising at least two half dies and having a chamber for filling the material. If the injected material is rigid after cooling, the two half dies are separated from each other in the axial direction. In addition, one half die is removed axially and then pushed out of the half die by an axially movable ejector formed in the other half die. Since the ejector known per se can be located according to the claims, the free end of the fixing device functions as a support surface for each ejector.

According to another claim, an already mentioned pressure pad, which is preferably axially formed between the freewheel outer ring and the axial bearing, and which serves to introduce pressure into a relatively sensitive axial bearing, has a perforated steel washer ( designed as a steel sheet washer, the steel washer is embodied in an ideal embodiment without plasticity and can be located on the freewheel outer ring on the axial side and on the axial bearing on the other axial side.

Since the outer circumference of the pressure pad thus formed can be located on the radially inner side of the fixing device, the pressure pad is centered with respect to the remaining converter components, respectively, through the fixing device like the neighboring axial bearings. According to another embodiment, the radially outer area of the pressure pad as described above is centered on the fixture of the stator hub on the one hand through the outer circumference and on the other hand to center the axial bearing through the inner circumference. The radial outer region may be bent axially. This allows the design to maximize the space savings in the area of the freewheel with a low total assembly cost.

Subsequently, embodiments of the present invention will be described in detail with reference to the drawings.

1 is a cross-sectional view of the upper half of a hydrodynamic converter emphasizing pressure pads and axial bearings centered by a stator and stator hub;

FIG. 2 is an axial view of the stator and pressure pad by cutting line II-II of FIG. 1, including a locking device protruding axially with respect to the radially inner side of the stator hub and angled in cross section.

3 is a cross-sectional view taken along the line III-III of FIG. 2.

FIG. 4 is the same as FIG. 2 but includes a fixing device having a semicircular cross section.

FIG. 5 is the same as FIG. 2 but includes a fixing device having a cylindrical cross section and spaced apart from the radially inner side of the stator hub; FIG.

6 is a view of a pressure pad viewed in the axial direction.

FIG. 7 is a cross-sectional view of the pressure pad along the cutting line VIII-VIII in FIG. 6. FIG.

FIG. 8 is the same as FIG. 1 but includes a pressure pad having an axial shoulder;

9 is the same as FIG. 1 but omits the pressure pad and includes an axial bearing as a sliding bearing;

10 is a cross-sectional view of a die with an ejector for the stator.

Reference Number List

1 converter housing 3 pump shell

5 pump impeller 7 turbine wheel

9 Stator 11 Rivet

13 turbine hub 15 teeth

17 blades 19 ties

21 Stator hub 23 Axial sliding bearing

25 grooves 27 axial rings

29 freewheel 31 freewheel outer ring

33 freewheel outer clamping body

35 freewheel inner wheel

37 Tooth 39 Axial protrusion

41 Fixture 43 Radial inner side of fixture

45 Axial bearing 46 Radial inner side of stator hub

47 Pressure pad 49 Roller bearing

51 Sleeve 53 Free end of fixture

55 Frame 57 Die

59 ejector 60 support surface

61 radial projection 62 circumferential region

63 Axial shoulder 65 Radial inner side of axial shoulder

67 axial sliding bearing 69 groove

71 Spacing 72 Central Axis

1 shows an area of a hydraulic torque converter in which stators are arranged. The overall illustration and description of the torque converter has been omitted. This is because such torque converters are known through the prior art, for example DE 44 23 640 A1 mentioned above.

In particular, a relatively small cross-sectional view of the converter housing 1 can be seen through the pump shell 3, which is part of the pump impeller 5. The pump impeller interacts with the turbine wheel 7, from which fluid can be supplied to the pump impeller 5 via the stator 9. The turbine wheel 7 is fixed to the turbine hub 13 using rivets 11, which are not rotated with the driven shaft in a manner not shown at their inner diameter by means of teeth 15. So that it is connected.

The stator 9 already mentioned has a wing arrangement 17 on the stator 21, and the free ends of the wing arrangement 17 are fixed via a connecting ring 19 adjacent to each other. The stator hub 21 is fixed on the freewheel outer ring 31 of the freewheel 29, the freewheel outer ring 31 is connected to the freewheel inner ring 35 through the clamp body 33, the freewheel The inner ring has a tooth 37 in its inner diameter and a hollow shaft, not shown, extending radially between the aforementioned driven shaft and the sleeve 51 on the side of the driven gear connected to the pump shell 3. Meshes with the tooth in the phase.

The stator hub 21 has an axial sliding bearing 13 which is designed with a groove 25 for penetrating the fluid for the converter housing on the side facing the turbine hub 13, the fluid being the hollow already mentioned. It can be supplied through a radial gap between the shaft and the driven shaft.

The stator hub 21 has, on the side facing the pump shell 3, an axial protrusion 39 extending in a relatively small radial cross section, as can be seen in FIGS. 2 and 3, in the circumferential direction. Has a fixing device 41 with an angular spacing α of the web, the fixing device starting from the radially inner side 46 of the stator hub 21 and having a substantially rectangular cross section of webs 55. It is formed by extending inward. As can be seen in particular in FIG. 3, the radially inner 43 of the fixing device 41 functions to receive the axial bearing 45 in the form of a roller bearing 49 as well as the pressure pad 47. The roller bearings are centered only on the radially inner side 43 of the fixing device 41, while the pressure pads 47 are radially on both sides of one holding device 41 in addition to the central function. The projection 61 (also corresponding to FIGS. 6 and 7) is engaged radially outward to the radially inner side 46 of the stator hub 21, whereby rotation is also prevented by the fixing device 41. The pressure pad 47 is simply designed as a non-plastic part and is preferably made by drilling a steel plate. This can reduce the cost of such pressure pads and minimize the use of axial space.

FIG. 4 shows another embodiment of a fixing device 41 which in turn projects radially inward with respect to the radially inner 46 which is semicircular in cross section. The position radially closest to the central axis 72 in the semicircular cross section serves as the radially inner side 43 of the fixing device 41, the radially inner side of the pressure pad 47 and the axial bearing 45. Occupy the center. Therefore, unlike the embodiment according to FIG. 2, the bearing surfaces of the pressure pad 47 and the axial bearing 45 on the fixing device 41 are reduced, but this does not cause a malfunction.

While the fixing device 41 according to FIGS. 2 and 4 holds the pressure pad 47 and the axial bearing 45 in a substantially centrifugal direction, the cross section is preferably cylindrical and the stator hub 21 Is fixed to the radially inner side 46 of the stator hub 21 at a predetermined distance, in particular the end of the stator hub 21 is designed integrally with the stator hub 21. When the fixing device 41 is elastically designed, the predetermined spacing allows elastic deformation in the direction of the radially inner side 46 of the stator hub 21, and the stator hub has the fixing device 41. Acts as a stopper for Thus, although the fixing device 41 may deform radially outward upon the axial insertion of the pressure pad 47 and the axial bearing 45, the pressure pad 47 is prevented due to the preloading generated thereby. In addition, the axial bearing 45 also maintains a force closed state. Since the force is blocked as described above, the axial bearing 45 including the radial protrusion 61 may be omitted, but the connection portion which is not rotated between the stator hub 21 and the pressure pad 47 is maintained.

According to FIGS. 2, 4 and 5, the free ends 53 of the fixing device 41 can each be used as support surfaces 60 for the ejector 59 of the die 57 shown in FIG. 10. . The stator hub 21 is mounted in the die 57 together with the wing arrangement 17, the linking ring 19 and the simultaneously extruded freewheel outer ring 31. The die 57 is shown as one half die and the other half die has already been removed. In order to easily remove the stator 9 from the die 57, the ejector 59 is moved to the left in the axial direction according to FIG. 10, and the axial force is applied to the support surface 60 of the fixing device 41. Force acts to push the stator 9 out of the chamber in the die 57.

6 and 7 show the pressure pad 47 as an integral type, as in the embodiment of the stator hub 21 including the fixing device 41 according to FIG. 2. The radial protrusions 61 can be clearly identified on both sides of the circumferential region 62, respectively. However, the radial protrusion 61 is combined with the stator hub 21 according to FIG. 5 and can be omitted without a substitute. In the embodiment according to FIG. 4, the circumferential regions 62 are each designed in a semicircle to adjust to the shape of the fixing device 41.

The difference between the drawing according to Fig. 8 and the drawing according to Fig. 1 is that the pressure pad 47 has an axially curved portion which forms an axial shoulder 63 in its circumferential region, the axial shoulder being an outer circumference. It is supported on the radially inner 43 of the fixing device 41, and through the radially inner 65 to form a central portion for the axial bearing 45. Since the axial shoulder 63 of the pressure pad 47 can be formed simultaneously with punching the pressure pad made of steel, no manufacturing cost is added in its structure.

In contrast to the figures previously dealt with, in which the axial bearing 45 is always formed by the roller bearing 49, according to FIG. 9, the groove 69 through which the lubricating fluid penetrates to improve the sliding properties and An axial sliding bearing 67 is formed which is designed together. Unlike roller bearings 49 for very thin lines, the sliding bearings 67 do not require pressure pads on the stator side, but the axial bearings 67 also radially inside the fixing device 41. Centered at (43).

When the stator is designed in the area of the hub and uses as little assembly cost as possible and uses less axial space, the stator can be centered relative to the freewheel as well as centered on the pressure pad or axial bearing.

Claims (10)

A stator hub having an axial protrusion projecting at least partially radially around the freewheel outer ring along the axial extension for radial bearing and protruding on at least one side opposite the freewheel outer ring toward the axis; A axial protrusion (39) in a stator for a hydraulic torque coverter having an axial bearing positioned axially with respect to one side and having at least one freewheel outer ring on one side and an effective axial bearing on the other side of the converter housing. ) Has a fixing device 41 circumferentially distributed with each other with a predetermined angle interval α, the fixing device protrudes above the inner side 46 of the stator hub 21 to its radial inner side 43. Stator, characterized in that to at least center the axial bearing (45) through. 2. The stator according to claim 1, wherein the fixing device (41) is formed by a web (55) which continues radially inward with respect to the remaining axial protrusions (39). 2. The fixing device (41) according to claim 1, wherein the fixing device (41) is firmly connected to the stator hub (21) at an axial end, and the connecting portion has the fixing device (41) radially inwardly of the stator hub (21). 46) and a stator, characterized in that it is selected to be arranged at a predetermined distance (71). The stator according to claim 3, wherein the fixing device (41) can be elastically deformed in the centrifugal direction. The device according to claim 1, wherein the stator is arranged within the die during manufacture, and can be subjected to axial force by an ejector of the die axially movable for removal from the die. 41. The stator, characterized in that the free end (53) functions as a support surface (60) for each ejector (59). The pressure pad according to any one of claims 1 to 4, wherein the pressure pad has a pressure pad assigned to the axial bearing, the pressure pad being on one side with the axial bearing and at least with the freewheel outer ring. And the pressure pad (47) is designed as a perforated steel plate washer. Stator according to claim 6, characterized in that the pressure pad (47) is centered on the fixing device (41). 7. The stator according to claim 6, wherein the pressure pad (47) comprises radial projections (61) which engage respectively on both sides of the fixing device (41) when viewed in the circumferential direction. 2. The axial direction of the pressure pad 47 as claimed in claim 1, wherein centering the axial bearing 45 on the fixing device 41 of the stator hub 2l is radially supported on the fixing device 41. Stator, characterized in that the axial bearing (45) is directed toward the radially inner side (65) of the axial shoulder (63). 10. The stator according to claim 9, wherein the axial shoulders (63) are formed substantially in the axial direction by bending a radially outer region of the pressure pad (47).