DE102009005109A1 - Fastening device for traction mechanism drive, comprises swivel arm, roller unit carried by swivel arm, and antifriction bearing that forms component of roller unit - Google Patents

Abstract

The fastening device comprises a swivel arm (2), a roller unit carried by the swivel arm, an antifriction bearing (1) that forms a component of the roller unit, and an inner bearing ring (3). An outer bearing ring (4) is provided, which has a rolling body (5) that is received in an antifriction bearing interior defined between the two bearing rings. A case structure (11) is provided, which is inserted into the inner bearing ring.

Description

Field of the invention

The The invention relates to a clamping device for a Traction drive with a swivel arm and a worn by this Roller device, wherein the roller device is a rolling bearing with a bearing inner ring, a bearing outer ring and rolling elements includes those defined in a between the two bearing rings Rolling bearing interior are added.

Background of the invention

Out DE 10 2005 020 530 A1 a tensioning device of the aforementioned type is known. In this proven tensioning device, a pivot pin made integral with the pivot arm is provided on the pivot arm which passes through the inner ring of the rolling bearing. At an end portion of the journal facing away from the pivot arm, an external thread is formed. On this external thread sits a nut which, as such, clamps the inner ring of the rolling bearing against a contact section of the pivoting arm.

Object of the invention

Of the Invention has for its object to provide solutions which makes it possible, a highly resilient connection the roller device to the pivot arm in a with respect on the running behavior of the rolling bearing device especially to allow advantageous manner.

invention solution

• – einem Schwenkarm
• – einer von dem Schwenkarm getragenen Laufrolleneinrichtung,
• – einem Wälzlager das Bestandteil der Laufrolleneinrichtung bildet, und einen Lagerinnenring, einen Lageraußenring sowie Wälzkörper umfasst die in einem zwischen den beiden Lagerringen definierten Wälzlagerinnenraum aufgenommen sind, und
• – einer Schraubeneinrichtung zur Anbindung der Laufrolleneinrichtung an den Schwenkarm,
• – wobei sich diese Spannvorrichtung dadurch auszeichnet,
• – dass in den Lagerinnenring eine Hülsenstruktur eingesetzt ist die unter Wirkung einer durch die Schraubeneinrichtung aufgebrachten Spannkraft in radialer Richtung weitbar ist.

This object is achieved according to a first aspect of the present invention by a tensioning device for a traction drive with:

• - a swivel arm
• A caster device carried by the pivot arm,
• - A rolling bearing forms part of the roller device, and a bearing inner ring, a bearing outer ring and rolling elements which are received in a defined between the two bearing rings rolling bearing interior, and
• A screw device for connecting the roller device to the swivel arm,
• - This tensioning device is characterized thereby,
• - That in the bearing inner ring a sleeve structure is used which is under the action of a force applied by the screw means clamping force in the radial direction is wide.

Thereby it is possible in an advantageous manner, the inner ring highly rigid to couple with the clamping arm and this under uniform Surface pressure distribution the radial clearance between the Inner ring and eliminate this supporting structure. moreover it becomes possible, the running clearance of the rolling elements defined to reduce.

According to one particularly preferred embodiment of the invention the sleeve structure formed such that these in the area its inner wall forms an inner cone. The radial expansion this sleeve structure can be achieved by this sleeve structure on a complementary designed Conical or cone structure is seated. This cone or cone structure can be replaced by another socket, or directly by a header. or shank portion of the fastening screw device formed be.

at an embodiment of the sleeve structure as relative thick-walled component this is preferably designed slotted. This slot may be substantially parallel to the central axis of the Sleeve structure to be executed. It is also possible, to perform this slot as a slanted or spiral slot. Furthermore, it is also possible a plurality of slots in the sleeve structure train to support their radial Weitbarkeit. These slots can in particular alternately from the Forehead areas of the sleeve structure the sleeve body push through. Furthermore, it is also possible, these slots alternately from the inner and the outer lateral surface to immerse in the sleeve body. This will the radial expansion, which can be tuned via the screw clamping force the sleeve structure further evened out.

The Sleeve structure can be designed so that the cone angle the inner cone causes a self-locking. This results a certain security effect. Alternatively, it is also possible set the cone angle such that the cone structure after loosening the fastening screw device also solves.

According to one Another aspect of the present invention, it is also possible a for receiving the sleeve structure according to the invention provided cone by integrally formed with the pivot arm To manufacture pin section. This concept makes it possible including the sleeve structure according to the invention the Inner ring of rolling bearing high strength and backlash-free directly on an integral with the pivot arm pin section to anchor.

The abovementioned fastening screw device can in particular be screwed into the pivot arm as being concentric with the center axis of the bearing inner ring be carried out fastening screw. It is also possible to form the fastening screw device by means of a stud bolt anchored in the swivel arm or, in particular, a threaded journal integral with the swivel arm. Furthermore, it is also possible to make the fastening screw device so that it comprises several, in particular three relatively small screw elements, which are arranged under preferably the same circumferential pitch on a corresponding pitch circle about the central axis of the bearing inner ring within the same.

According to one Another aspect of the present invention is the object specified above also by the design of a tensioning device according to the in Claim 8 specified features solved. Because of this Concept will make it possible, an extremely uniform circumferential distribution of the bearing inner ring to achieve acting axial forces. This concept can advantageously also in combination with the aforementioned measures will be realized.

It is possible, the aforementioned ring element as a ring with a Perform Kalottengelenkringzone. This ring element can be used in particular as extruded part or as sheet metal forming part be executed. The Kalottengelenkringzone formed on the ring member is preferably designed as a concave surface. The ring element can in addition to the Bewerkigung the inventive Joint concept also for the realization of a bearing cover device be used. This bearing cover device can be designed be that they face the rolling bearing interior the environment at least largely secluded. It is possible, connect a sealing lip device to this bearing cover device, in particular to vulcanize.

The Ring element according to the invention can either with a correspondingly complementary designed and on the Ring element in turn seated and axially from the clamping screw cooperate loaded auxiliary ring.

alternative For this purpose, it is also possible with the inventive Ring element cooperating counter surface through the bottom of the screw head to a corresponding fastening screw form.

Brief description of the figures

Further Details and features of the invention will become apparent from the following Description in connection with the drawing. It shows:

1a an axial sectional view to illustrate the inventive concept for connecting the bearing device of a clamping device to a clamping arm,

1b an axial sectional view illustrating the inventive concept for connecting the bearing device of a clamping device to a clamping arm using a clamping screw with outer cone head,

2 an axial sectional view illustrating a double-socket variant of the connection concept according to the invention,

3 a detailed view for illustrating the axial tension of a rolling bearing inner ring to a pivot arm using a ring pan element,

4 an axial sectional view illustrating a fourth variant of an inventive connection concept.

Detailed description the figures

In 1a is, in the form of a detailed representation of the inventive connection concept for connection of the rolling bearing device 1 a Spannvorrich device to a here only partially indicated swivel arm 2 shown. The rolling bearing 1 includes a bearing inner ring 3 , a bearing outer ring 4 as well as rolling elements 5 in one between the two bearing rings 3 . 4 defined rolling bearing interior are added. The aforementioned rolling bearing interior is designed as a sealed bearing and extent with sealing lips 6 . 7 Mistake. The rolling bearing 1 is designed as a permanently lubricated rolling bearing. The rolling elements 5 be through a cage device 8th guided.

The attachment of the bearing inner ring 3 to the swivel arm 2 via a fastening screw 9 , This fastening screw 9 does not engage directly with the roller bearing inner ring 3 but with this is a tensioning mechanism 10 coupled. The clamping mechanism 10 includes a sleeve structure 11 and an internal geometry of this sleeve structure 11 complementarily designed inner bush 12 , The sleeve structure 11 is designed as a slotted sleeve and forms a conical surface in the region of its inner bore. The cone mechanism shown here makes it possible to use one side of the fixing screw 9 generated axial force of the inner bush 12 in the sleeve structure 11 to drive in while the sleeve structure 11 expand radially. The sleeve structure 11 sits substantially full surface in the inner bore of the rolling bearing inner ring 3 , The concept shown here makes it possible to use the roller bearing inner ring 3 under a substantially uniform surface pressure distribution to stretch radially from the inside and thus free of play on the pivot arm 2 to anchor.

The cone angle α shown here can be set so that the clamping mechanism 10 acts as a substantially self-locking tensioning mechanism.

In 1b a variant of a clamping device according to the invention is shown, in which, deviating from the embodiment according to 1a the inner bush 12 through the head area of the fixing screw 9 is replaced. This head area 9b forms a conical outer shell of the pull on the fastening screw in the sleeve structure 11 penetrates and radially expands according to the tightening torque.

In 2 a further variant of a tensioning device according to the invention is shown, in which, deviating from the embodiment according to 1a , not the inner socket 12 but the sleeve structure 11 under the action of the head 9a the clamping screw 9 is loaded axially. Although not shown here, it is also possible to use the inner bushing 12 as an integral part of the swivel arm 2 perform.

Especially at the in 2 illustrated variant, it is possible the inner socket 12 and the sleeve structure 11 to match each other so that when reaching a predetermined clamping path, the bottom of the screw head 9a on an end face of the inner bush 12 rests and thus a further axial displacement of the sleeve structure and a concomitant, possibly impermissibly strong, radial expansion of the rolling bearing inner ring 3 is prevented.

In 3 is in the form of a detailed representation of a third variant for connecting the roller bearing inner ring 3 a tensioning device to a swivel arm 2 illustrated. On the swivel arm 2 is an integral with this extension 2a formed, which forms a seat surface on which the inner peripheral surface 3a of the rolling bearing inner ring 3 sitting. For tensioning the rolling bearing inner ring 3 to the swivel arm 2 is a fixing screw 9 intended. The transfer of the through this fixing screw 9 generated clamping force on the roller bearing inner ring 3 takes place according to a particular aspect of the present invention by a ring cup element 14 , The ring pan element 14 forms a Kalottengelenkringzone 14a , which is designed here as Konkavfläche. This Kalottengelenkringzone 14a sits directly on one, through a bottom of the mounting screw 9 formed Kalottengelenkgegenfläche 9a , By the concept shown here, a uniform load of the inner ring 3 of the rolling bearing reached. It is possible, this ring pan element 14 be designed so that this also acts as a component by which the ball bearing against environmental influences, especially dusts protected and at the same time the heat dissipation from the bearing inner ring 3 is favored.

This in here 3 shown concept for uniform introduction of the fastening screw 9 generated axial forces in the roller bearing inner ring 3 can in particular also in combination with the cone mechanism after 2 will be realized. The ring pan element 14 can be used in particular as an integral part of the 2 illustrated sleeve structure 11 be executed.

In 4 a fourth embodiment of a tensioning device according to the invention is shown. The attachment of the roller device 15 on the swivel arm 2 also takes place using one in the inner ring 3 of the rolling bearing 1 sitting sleeve structure 11 , In the embodiment shown here sits the sleeve structure 11 on a with respect to its outer peripheral surface crowned inner sleeve 12 , The sleeve structure 11 is executed in this embodiment as a radially wide, preferably axially slotted socket. The mechanism shown here results in the context of the assembly process, a relatively uniform, radial expansion of the sleeve structure 11 and a substantially uniform circumferential distribution of the sleeve structure 11 attacking, through the inner sleeve 12 transmitted axial forces. In this embodiment, the screw biasing force flows through the preferably slotted joint inner ring into the outer joint ring, which presses radially against the inner ring of the ball bearing, which is ultimately secured by friction in the embodiment shown here. This concept makes it possible by tuning the part of the fixing screw 9 Applied clamping force and the radial clearance in the rolling bearing 1 adjust. By the concept illustrated here, particularly advantageous Schmiegungsverhältnisse between the rolling elements 5 and the rolling bearing races 3 respectively. 4 be achieved.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• DE 102005020530 A1 [0002]

Claims (13)

Tensioning device for a traction drive with: - a pivoting arm ( 2 ) - one of the swivel arm supported roller device ( 15 ), - a rolling bearing ( 1 ) the part of the roller device ( 15 ), and a bearing inner ring ( 3 ), a bearing outer ring ( 4 ) as well as rolling elements ( 5 ) comprises in one between the two bearing rings ( 3 . 4 ) are received, and - a screw device ( 9 ) for connecting the roller device ( 15 ) to the swivel arm ( 2 ), characterized in that - in the bearing inner ring ( 3 ) a sleeve structure ( 11 ) is inserted under the action of a by the screw device ( 9 ) applied clamping force in the radial direction is weitbar. Clamping device according to claim 1, characterized in that the sleeve structure ( 11 ) forms an inner cone. Clamping device according to claim 2, characterized in that the sleeve structure ( 11 ) on a cone bushing ( 12 ) is seated. Clamping device according to claim 2, characterized in that the sleeve structure ( 11 ) is seated on a conical mantle by a screw head ( 9a ) is formed. Clamping device according to at least one of claims 1 to 4, characterized in that the sleeve structure ( 11 ) is executed slotted. Clamping device according to claim 5, characterized in that that the slot designed as a slanted or spiral slot is. Clamping device according to at least one of the claims 2 to 6, characterized in that the cone angle (α) is set so that there is a self-locking. Tensioning device for a traction drive with: - a pivoting arm ( 2 ) - one of the swivel arm supported roller device ( 15 ), - a rolling bearing ( 1 ) the part of the roller device ( 15 ), and a bearing inner ring ( 3 ), a bearing outer ring ( 4 ) as well as rolling elements ( 5 ) comprises in one between the two bearing rings ( 3 . 4 ) are received, and - a screw device ( 9 ) for connecting the roller device ( 15 ) to the swivel arm ( 2 ), in particular according to at least one of claims 1 to 7, characterized in that - the introduction of the by the screw device ( 9 ) applied axial force in the bearing inner ring ( 3 ) including a ring pan element ( 14 ) is accomplished with respect to the screw device ( 9 ) is tiltable about a bundle of tilting axes in a to the axis (X) of the bearing inner ring ( 3 ) radial plane. Clamping device according to claim 8, characterized in that the ring cup element ( 14 ) is designed as a ring with a Kalottengelenkringpfanne. Clamping device according to claim 9, characterized that the Kalottengelenkringpfanne as a concave spherical shell ring surface is executed. Clamping device according to claim 8 or 9, characterized in that the ring cup element ( 14 ) Part of a bearing cover device forms as such the rolling bearing inner space from the environment at least largely isolated. Clamping device according to claim 11, characterized in that a sealing lip device is integrated into the bearing cover device is. Clamping device according to claim 10, characterized in that the screw device ( 9 ) on its bearing ring ( 3 ) facing the underside one to the ball shell ring surface of the ring cup element ( 14 ) complementary seat ( 9a ).