DE102017120761A1 - Rolling bearing for supporting a transmission shaft of a motor vehicle transmission - Google Patents

Abstract

It is a roller bearing (10), in particular needle roller bearings or cylindrical roller bearings, provided for bearing a transmission shaft of a motor vehicle transmission with a, in particular an outer ring forming, sleeve (12) on the sleeve (12) rolling rollers (14) and one of the rollers (14 ), wherein the sleeve (12) has an axial stop for the cage (16) forming collar (18), wherein the collar (18) has at least one lubricating opening (22) for supplying a lubricant. The lubricating opening (22) in the collar (18) of the sleeve (12) allows sufficient lubrication even at a low delivery pressure, so that adequate lubrication of bearings in a motor vehicle transmission is made possible.

Description

Field of the invention

The invention relates to a rolling bearing, by means of which a transmission shaft of a motor vehicle transmission can be stored.

Background of the invention

It is known to store a transmission shaft of a motor vehicle transmission by means of a needle bearing, wherein the needle bearing must be lubricated.

There is a continuing need in a motor vehicle transmission to ensure adequate lubrication of bearings.

Object of the invention

It is the object of the invention to show measures that allow adequate lubrication of bearings in a motor vehicle transmission.

Description of the invention

The object is achieved by a rolling bearing with the features of claim 1. Preferred embodiments of the invention are set forth in the dependent claims and the description below, each of which individually or in combination may constitute an aspect of the invention.

According to the invention, a roller bearing, in particular a needle roller bearing or cylindrical roller bearing, for supporting a gear shaft of a motor vehicle transmission is provided with a, in particular an outer ring forming sleeve on the sleeve rolling rolls and a rollers rotatably receiving cage, wherein the sleeve is an axial stop for the cage forming collar wherein the collar has at least one lubricating opening for supplying a lubricant.

Usually, the collar of the sleeve extends in the radial direction to the diameter of the respective other component to be stored, so that a minimum possible gap remains between the collar and the component which is relatively rotatable relative to the sleeve. For lubricating the rolling bearing, a pressure high enough to pump the lubricant into the interior of the rolling bearing through the gap formed between the collar and the relatively rotating member may be established in a lubricant supply system. In particular, in low-motor vehicle engines, for example in motorcycles, and / or in a low-power operating state of the motor vehicle engine, it is possible that not enough power is provided by the motor vehicle engine to promote the lubricant in the rolling bearing can. Due to the at least one lubrication opening in the collar of the rolling bearing, however, the flow cross section for the lubricant can be increased, at least in a limited angular range, so that the lubricant can enter the rolling bearing even at a lower delivery pressure. The lubricating opening in the collar of the sleeve allows sufficient lubrication even at a low delivery pressure, so that a sufficient lubrication of bearings in a motor vehicle transmission is made possible.

In particular, the collar has a narrow side pointing in the radial direction, wherein the lubrication opening is designed as a recess beginning on the narrow side. The lubricating opening can thereby be designed to be open to the relatively rotatable component. This facilitates the conveyance of the lubricant between the rollers and the component supported by the rollers and rotatable relative to the sleeve.

Preferably, a plurality of circumferentially uniformly distributed lubrication openings are provided. The entire flow cross section for supplying the lubricant is thereby increased. In addition, it is possible that one of the plurality of lubrication openings is always positioned at a position which is favorable in the circumferential direction, in order to permit transport of the lubricant into the interior of the rolling bearing, in particular due to gravity.

Particularly preferably, the sleeve has a circumferentially extending groove adjoining the collar for receiving the lubricant entering via the lubricating opening. An obstruction of the lubrication opening by the cage and / or by the rollers can be avoided. The channel allows the lubricating opening that has entered through the lubricating opening to be conveyed between the rollers and the sleeve. In particular, the lubricant may accumulate in the channel, so that the channel can entrain the lubricant during a rotation. This allows the lubricant to be easily distributed over the circumference of the sleeve.

In particular, the channel is configured by a material tapering of the sleeve, in particular by embossing during forming of the collar, wherein in particular a lateral surface of the sleeve pointing away from the channel has a constant diameter. The channel can be configured, for example, as a bending radius pressed into the material of the sleeve. The production of the channel can be particularly simple and inexpensive, without that through the gutter a Storage surface and / or a contact surface of the sleeve is impaired. In particular, a protruding from the lateral surface of the sleeve bead, which could affect the pressing of the sleeve into a component to be stored, can be avoided.

Preferably, the cage has an axial clearance relative to the sleeve, wherein in particular an axial extent of the cage is less than an axial extent of the sleeve between two axial stops for the cage. Due to the axial play, a gap can be formed between the cage and the collar acting as an axial stop, which facilitates the penetration of the lubricant.

Particularly preferably, the sleeve on an axial end facing away from the collar on another collar for forming a further axial stop, wherein the lubricating opening is provided only in the collar. The cage can be taken captively between the collar and the other collar. Since the lubricating opening is provided only in the collar and not in the further collar, a higher flow resistance for the lubricant is formed on the further collar, so that the lubricant entering via the lubricating opening is better retained in the rolling bearing. The required mass flow for lubricating the bearing can be reduced.

In particular, a ratio of the axial length of the roller to the diameter of the roller is greater than 2.5. The rolling bearing is designed as a needle bearing, which is particularly suitable due to the low space requirement for the storage of transmission shafts.

The invention further relates to a motor vehicle transmission for converting a power generated by a motor vehicle engine, with a transmission housing, a transmission input shaft for introducing the power into the transmission housing, a transmission output shaft for deriving the converted power from the transmission housing, a lubricant supply system for lubricating the transmission input shaft and / or the Transmission output shaft and at least one rolling bearing, which may be as described above and further developed for storage of the transmission input shaft and / or the transmission output shaft, in particular on the transmission housing, wherein a lubricant outlet of the lubricant supply system communicates with the lubricating opening of the rolling bearing. The lubricating opening in the collar of the rolling bearing allows sufficient lubrication even at a low delivery pressure of the lubricant supply system, so that sufficient lubrication of bearings in a motor vehicle transmission is made possible.

list of figures

• 1 eine schematische perspektivische Ansicht eines Wälzlagers und
• 2 eine schematische Schnittansicht eines Details des Wälzlagers aus 1.

The invention will be explained by way of example with reference to the accompanying drawings based on preferred embodiments. Showing:

• 1 a schematic perspective view of a rolling bearing and
• 2 a schematic sectional view of a detail of the rolling bearing 1 ,

Detailed description of the drawings

The features illustrated below may represent an aspect of the invention both individually and in combination.

This in 1 Rolling bearings shown on the example of a needle bearing 10 has a sleeve acting as an outer ring sleeve 12 on, on the designed as a thin needle rollers roles 14 can shift. The roles 14 are in a Ka 16 guided in the axial direction between one of sleeve 12 integrally formed collar 18 and one of the sleeve 12 integrally formed another collar 20 is taken captive. The collar 18 and the other collar 20 each serve as axial stop for the Ka 16 , with the cage between the collar 18 and the other Kraken 20 is received with an axial clearance, in particular in the order of a clearance fit. The rolling bearing 10 can also be a radially inward to the sleeve 12 on the rollers 14 have rolling inner ring. In the illustrated embodiment is in the rolling bearing 10 no inner ring provided so that the rolling bearing 10 designed to be rolled directly on a shaft to be stored. Preferably, the shaft to be supported is in a contact area in which the rollers 14 roll over, hardened. The sleeve 12 can be pressed into a suitable opening of a hub, a housing, in particular motor vehicle transmission housing, or other component forming the opening.

To the rolling bearing 10 and sufficiently lubricate the contact area of the shaft to be stored, with the aid of a Schmiermittelzuführsystems a lubricant, in particular oil, to the collar 18 be introduced. So that even with a low discharge pressure for the lubricant, the lubricant in the rolling bearing 10 can penetrate, the collar points 18 a plurality of evenly distributed in the circumferential direction lubrication openings 22 on, leading to an edge of the collar 18 are opened open. In the illustrated embodiment, the lubrication openings 22 designed to be radially inwardly open, so that in the region of the lubrication openings 22 between the collar 18 and the shaft to be supported results in a correspondingly larger flow cross section for the lubricant.

As in 2 can be shown on the collar 18 one from the sleeve 12 formed by a material taper circumferentially circumferential annular groove 24 connect. The gutter 24 can one to the roles 14 training open groove. That's about the lubrication opening 22 Ingressing lubricant may optionally by a by an axial clearance of Kä 16 to the collar 18 trained gap to the gutter 24 from where the lubricant can be distributed over the entire circumference. Out of the gutter 24 The lubricant can move towards the other collar 20 to the roles 14 and reach the contact area of the shaft to be supported and provide a friction-reducing lubrication between the relatively movable surfaces.

LIST OF REFERENCE NUMBERS

10

roller bearing

12

shell

14

role

16

Cage

18

collar

20

another collar

22

lubrication hole

24

gutter

Claims (9)

Roller bearings, in particular needle roller bearings or cylindrical roller bearings, for supporting a gear shaft of a motor vehicle transmission, with a sleeve (12), in particular forming an outer ring, rollers (14) rolling on the sleeve (12) and a cage (16) rotatably receiving the rollers (14) ), wherein the sleeve (12) has an axial stop for the cage (16) forming collar (18), wherein the collar (18) has at least one lubricating opening (22) for supplying a lubricant. Rolling bearings after Claim 1 , characterized in that the collar (18) has a pointing in the radial direction narrow side, wherein the lubricating opening (22) is designed as a beginning of the narrow side recess. Rolling bearings after Claim 1 or 2 , characterized in that a plurality of circumferentially uniformly distributed lubrication openings (22) are provided. Rolling bearings according to one of Claims 1 to 3 , characterized in that the sleeve (12) has a circumferentially extending groove (24) adjoining the collar (18) for receiving the lubricant entering via the lubricating opening (22). Rolling bearings after Claim 4 , characterized in that the channel (24) by a, in particular by embossing during forming of the collar (18) producible, material tapering of the sleeve (12) is configured, in particular one of the channel (24) facing away from lateral surface of the sleeve (12 ) has a constant diameter. Rolling bearings according to one of Claims 1 to 5 , characterized in that the cage (16) has an axial clearance relative to the sleeve (12), wherein in particular an axial extent of the cage (16) is less than an axial extent of the sleeve (12) between two axial stops for the cage (16) is. Rolling bearings according to one of Claims 1 to 6 , characterized in that the sleeve (12) at one of the collar (18) facing away from the axial end has a further collar (20) for forming a further axial stop, wherein the lubricating opening (22) is provided only in the collar (18). Rolling bearings according to one of Claims 1 to 7 , characterized in that a ratio of the axial length of the roller (14) to the diameter of the roller (14) is greater than 2.5. A motor vehicle transmission for converting a power generated by an automotive engine, with a transmission housing, a transmission input shaft for introducing the power into the transmission housing, a transmission output shaft for deriving the converted power from the transmission housing, a lubricant supply system for lubricating the transmission input shaft and / or the transmission output shaft and at least one rolling bearing (10) according to one of Claims 1 to 8th for supporting the transmission input shaft and / or the transmission output shaft, in particular on the transmission housing, wherein a lubricant outlet of the lubricant supply system communicates with the lubrication opening (22) of the rolling bearing.

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