Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16H—GEARING
  • F16H29/00—Gearings for conveying rotary motion with intermittently-driving members, e.g. with freewheel action
  • F16H29/02—Gearings for conveying rotary motion with intermittently-driving members, e.g. with freewheel action between one of the shafts and an oscillating or reciprocating intermediate member, not rotating with either of the shafts
  • F16H29/04—Gearings for conveying rotary motion with intermittently-driving members, e.g. with freewheel action between one of the shafts and an oscillating or reciprocating intermediate member, not rotating with either of the shafts in which the transmission ratio is changed by adjustment of a crank, an eccentric, a wobble-plate, or a cam, on one of the shafts

Definitions

• the present invention relates to a drive arrangement for a continuously variable transmission, in particular for a crank CVT of a motor vehicle.
• From DE 102 43 535 A1 discloses a continuously variable transmission of a motor vehicle, which essentially comprises a drive shaft and an output shaft, which are aligned parallel to one another rotatably mounted in a transmission housing.
• these two shafts are connected to one another via an eccentric device provided on the drive shaft and a freewheel device arranged on the output shaft.
• the eccentric consists of a plurality of eccentric units, which are arranged axially next to one another on the drive shaft.
• the freewheel device consists of several freewheel units, which are arranged axially adjacent to one another on the drive shaft.
• the drive shaft has a guide area offset eccentrically with respect to its axis of rotation, on the lateral surface of which an eccentric component is rotatably mounted.
• the drive shaft On the Exzenterbauteil one side of at least one connecting rod is rotatably mounted in the configuration of the continuously variable transmission as a crank CVT (Continuous Variable Transmission).
• Each eccentric component has a recess for receiving a guide region of the drive shaft, wherein an internal toothing extends around the recess.
• the internal toothing is matched to the lateral surface of the guide region in such a way that the eccentric component is centered over the internal toothing on the guide region.
• the drive shaft or the guide areas of the same have a recess extending in the direction of the axis of rotation of the drive shaft, in which an adjustment shaft is rotatably arranged.
• the adjusting shaft has an outer toothing, which engages in the internal toothing of the eccentric components.
• the adjusting shaft is mounted in the recess of the driving shaft via the sections of the external toothing forming the tip circle of the external toothing.
• the guide areas are designed so crescent-shaped that their recesses are open over a certain angular range, so that in these angular ranges, the external toothing of the adjusting against the outer maneuvering tel specifications the guide portions can protrude radially, with engagement in the internal teeth of the Exzenterbaumaschinemaschines is possible.
• the disk-like guide areas have with respect to their cylindrical surface a center line which is arranged eccentrically by a certain distance from the axis of rotation of the drive shaft.
• the eccentric members have, with respect to their cylindrical surfaces, a centerline which is eccentrically offset from said centerline of the guide portions by a distance such that the eccentricity of the centerline of the eccentric members with respect to the axis of rotation of the drive shaft is twice as large as the eccentricity of the centerline of the actuator Guide areas opposite this axis of rotation.
• the eccentric component of an eccentric unit Due to the rotation of the adjusting shaft in the recess of the drive shaft, the eccentric component of an eccentric unit is rotated about the center line of the corresponding guide region.
• the center line of the Exzenterbauerss moves around the center line of the guide portion, wherein the extent of the eccentricity of the Exzenterbauerss is changed with respect to the axis of rotation of the driving shaft.
• the adjusting is usually inserted in the known stepless crank CVT's without storage and with little play in the drive shaft.
• a problem is that the flexible drive shaft is supported under load on the adjusting shaft, whereby an increased adjusting torque arises, which is due to a metallic friction when clamping the adjusting shaft in the axial recess of the driving shaft. Since the adjusting torque is increased, this leads to an increased power requirement on the side of the adjusting shaft rotating when adjusting electric drive.
• a deflection of the flexurally soft drive shaft can be minimized according to a patent application of the same date of the present patent applicant, that the mounted with their outer sides in a transmission housing drive shaft is additionally stored in its central region with respect to the transmission housing.
• axially spaced, cylindrical stiffening areas can be provided between the outer bearing points of the drive axle.
• the object of the present invention is to design a drive arrangement for a continuously variable transmission of a motor vehicle such that a deflection of the drive shaft can be largely reduced or avoided without additional axial space is claimed.
• a drive arrangement for a continuously variable transmission in particular a crank CVT of a motor vehicle, having a drive shaft whose outer regions are mounted in a transmission housing.
• the drive shaft has a recess in which an adjusting shaft is rotatably arranged, in the rotation of the Exzenterbaumaschine an arranged on the drive shaft eccentric are continuously adjustable.
• the drive shaft has in its central region at least one cylindrical disk-shaped stiffening region.
• the adjusting shaft has in the axial direction spaced from each other at least one circumferential groove which, when the adjusting shaft is mounted in the recess of the drive shaft, is aligned with the stiffening region.
• rolling elements are arranged such that they are supported on the one hand on the serving as an inner raceway bottom surface of the circumferential groove and on the other hand on serving as the outer race inner surface of the stiffening region.
• the essential advantage of the drive arrangement according to the invention is that a largely friction-free mounting of the adjusting shaft in the recess of the drive shaft is made possible, wherein the inner cylindrical surface of the at least one central stiffening region of the drive shaft is used as a running surface for rolling bearings.
• Particularly advantageous for achieving a friction-free mounting of the adjusting shaft in the central region in the axial direction of the adjusting a plurality of stiffening regions are arranged spaced from each other and has the Verstellweile this stiffening regions according to a plurality of circumferential grooves.
• the rolling elements are held in an annular cage, which is expediently interrupted at one point by an opening region. In this way, a particularly simple and quick installation of the rolling body in the circumferential grooves is possible.
• the adjusting shaft may have an external toothing extending in its axial direction for adjusting the eccentric components, wherein this external toothing is interrupted in the regions of the circumferential grooves.
• the drive shaft can be used in a preferred application - A - tion of the drive assembly according to the invention be part of a crank-CVT's, wherein the rotation of the drive shaft is transmitted via an eccentric arranged on the drive shaft to a freewheel device mounted in a gear housing parallel to the drive shaft output shaft, wherein the eccentric on the drive shaft in the axial direction each having a recess for receiving a with respect to the axis of rotation of the drive shaft eccentrically arranged guide region, wherein the internal teeth of the Exzenterbaumaschinemaschine engage in the outer toothing of the adjusting shaft.
• an eccentric component is arranged between each two adjacent reinforcing regions.
• Figure 1 is a longitudinal section of a drive shaft of a known crank CVT, wherein the drive shaft axially spaced stiffening regions to prevent deflection, wherein in a recess of the drive shaft, an adjusting shaft is arranged and wherein in Unfangsnuten the adjusting shaft on the inner surfaces of the stiffening areas and on the bottom surfaces the circumferential grooves supporting rolling bearings are provided;
• Figure 2 is a perspective view of the arrangement of Figure 1;
• FIG. 3 is a perspective view of the adjusting shaft of the invention
• Figure 5 is a perspective view of a rolling bearing with flexible cage
• Figure 6 is a perspective view of a drive shaft, wherein the at
• FIG. 7 shows a side view, indicated by the lines VII-VII of FIG
• FIG. 8 shows a side view, indicated by the lines VIII-VIII in FIG.
• a space-saving and low-friction mounting of the drive shaft on the adjusting shaft can be achieved by utilizing arranged on the drive shaft in the central region of the drive shaft cylindrical stiffening areas, that an inner bearing of the drive shaft with respect to the adjusting shaft on the inner surfaces of the stiffening regions is sought.
• the drive shaft of a continuously variable transmission is designated 1.
• an adjusting shaft 2 is arranged or mounted in the manner explained in more detail below.
• the outer end portions of the drive shaft 1 are rotatably mounted in a conventional manner in a transmission housing with the aid of bearings (not shown).
• the corresponding bearing points of the drive shaft 1 are designated in the figure 1 with L.
• the drive shaft 1 has the already mentioned above stiffening regions 4, which are spaced from each other in the axial direction of the drive shaft 1 in the central region of the drive shaft 1 and contribute to increase the rigidity of the drive shaft 1.
• the stiffening regions 4 each have the shape of cylindrical circular disks, which are arranged concentrically to the axis of rotation of the drive shaft 1. It should be noted that stiffening areas 4 can be provided in different numbers. Also, the provision of only one stiffening areas in the middle region of the adjusting shaft is conceivable. Between the stiffening regions 4, the aforementioned eccentric components 14 of the Exzenterein direction are provided in the apparent manner.
• the adjusting shaft 2 has according to the number and the distance of the stiffening regions 4 axially spaced circumferential grooves 5, in which rolling bearings 6 are located, which are preferably designed according to Figure 5.
• the circumferential grooves 5 are aligned with the stiffening regions 4, when the adjusting shaft 2 is inserted according to Figure 1 in the recess 3 of the drive shaft 1.
• the rolling elements 9 of the roller bearings 6 are on the one hand in each case in contact with the inner running surfaces.
• the rolling bearings 6 are inserted into the circumferential grooves 5 in the recess 3 of the drive shaft 1 before the adjustment shaft 2 is mounted.
• FIG. 5 shows a characteristic and preferred roller bearing 6, which can be inserted in one piece into the circumferential grooves 5, since the rolling bodies 9 are held on a flexible cage 10.
• the cage 10 is interrupted in an opening portion 11, so that it can be expanded for easy and quick assembly of the rolling bearing 6 in a circumferential groove 5.
• roller bearing 6 of FIG. 5 full complement bearings can be provided which have no cage.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Transmission Devices (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=41181065

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Cited By (2)

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Citations (2)

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• 2009
  • 2009-07-06 DE DE112009001762T patent/DE112009001762A5/de not_active Withdrawn
  • 2009-07-06 DE DE102009031793A patent/DE102009031793A1/de not_active Withdrawn
  • 2009-07-06 WO PCT/DE2009/000938 patent/WO2010009697A1/de active Application Filing
  • 2009-07-06 JP JP2011519028A patent/JP5586600B2/ja not_active Expired - Fee Related

Patent Citations (2)

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