JP3949583B2 - Method and apparatus for manufacturing transmission plate of continuously variable transmission mechanism - Google Patents

Description

  The present invention relates to a method and apparatus for manufacturing a transmission plate in a continuously variable transmission mechanism such as a winding transmission mechanism.

  Such a continuously variable transmission mechanism is also referred to as a CVT transmission mechanism (Continuously Variable Transmission), for example, at least a pair of transmission surfaces, each essentially having a conical or spherical shape, ie, a deflected transmission surface. A transmission plate is provided. Here, the transmission surface is understood as a surface used for power transmission. The shape of the transmission surface may be deflected or straight in the radial direction of the transmission plate. The transmission plates, which are arranged in pairs with respect to each other, can be adjusted with respect to the distance to each other, between which a power transmission element such as a thin knotted chain can be turned. By adjusting the distance between the transmission plates, a continuously adjustable capability is achieved. Here, the power transmission element moves in a power closed manner along the transmission surface on each of the opposing transmission plates. Thus, during operation of the transmission mechanism, the power transmission element is moved up and down, or from the inside to the outside or vice versa, along the transmission surface of the transmission plate, between the inner and outer diameters of the transmission surface.

  The problem here is that the transmission plate needs to be pressed against the power transmission element with such a force that the power transmission element cannot slip through. Slip must be substantially avoided. On the other hand, in order to avoid unnecessarily high pressing on the surface during power transmission from the transmission plate to the power transmission element, it is desired to keep the pressing force of the transmission plate as small as possible. Nevertheless, no slip should occur between the transmission plate and the power transmission element.

  When manufacturing such a transmission plate in a continuously variable transmission mechanism, there is a further problem that the transmission surface of the transmission plate must be extremely strong and be made with as little tolerance as possible. In essence, the high strength of the transmission plate is intended to extend the life of the transmission mechanism as much as possible. In order to ensure a smooth and as low noise operation of the transmission mechanism as possible, it is necessary to avoid such irregularities and irregularities in the shape of the transmission surface of the transmission plate.

  Accordingly, an object of the present invention is to provide a method or an apparatus for manufacturing a transmission plate in a continuously variable transmission mechanism, thereby improving the power transmission characteristics between the transmission plate and the power transmission element, thereby improving the service life. To prevent the power transmission element from slipping through.

  This problem is solved by a manufacturing method having the features according to claim 1 or by an apparatus having the features according to claim 10. Advantageous forms and modifications of the invention are the subject of the respective dependent claims.

In the method for manufacturing a transmission plate according to the present invention, when grinding a conical or spherical transmission surface, a relative reciprocation in the radial direction with respect to the workpiece spindle is performed between the grinding plate and the transmission plate. The grinding area of the grinding plate on the surface is moved between the inner radius and the outer radius of the surface. Thereby, the grinding image of the transmission surface can be changed intentionally. Instead of the essentially circular grinding image that is common in cylindrical grinding, the method according to the invention can result in, for example, a cruciform grinding. Here, the cross-shaped grinding is a grinding image in which grinding lines intersect with each other in a certain manner. In this way, the surface roughness of the transmission surface of the transmission plate can be intentionally adjusted, thereby providing optimum conditions for avoiding slippage of the power transmission element during operation of the transmission mechanism. The surface can be manufactured with the required narrow dimensional tolerances and has the required strength. By deliberately adjusting the surface roughness of the transmission plate, the slip behavior is clearly improved, or slip is avoided to a considerable extent, so that it is possible to further reduce the transmission plate pressing force. And the friction during power transmission is also reduced accordingly, and the efficiency of the transmission mechanism is increased accordingly. Therefore, a continuously variable transmission mechanism having a transmission plate manufactured according to the present invention ultimately leads to a reduction in fuel consumption of the internal combustion engine compared to a transmission mechanism manufactured in the prior art.

  The cruciform grinding produced in the manner described above provides the following advantages: That is, the loading rate on the surface of the transmission plate is higher because it is a “cruciform grinding” similar to that on a sharpened surface.

  Peripheral grinding occurs during angled cut grinding, which must be accurately aligned in the form of a geometric negative and any alignment geometry defects are reflected on the workpiece . The reciprocal motion causes the alignment shape defects to be “verzogen”, thus preventing the shape defects from being reflected on the workpiece. Furthermore, the cross-shaped grinding also provides an advantage relating to power transmission at the power transmission position. Furthermore, reciprocal grinding reduces the thermal load on the workpiece during grinding, because the workpiece is completely cooled again at the same grinding position by the time the grinding plate again comes into contact.

  According to an advantageous embodiment of the invention, the rotational speed of the workpiece spindle is synchronized with the reciprocating movement. Thereby, a uniform grinding image can be generated in all regions on the transmission surface. Furthermore, this can intentionally increase or decrease the surface roughness. In one advantageous aspect of the invention related to this, the rotational speed of the workpiece spindle is varied depending on the radial grinding position of the grinding plate on the transmission surface. Thus, for example, by increasing or decreasing the speed of the workpiece spindle, in particular by achieving the same grinding conditions at every grinding location, it is possible to produce a uniform grinding image over the entire area of the transmission surface and thus the transmission plate. Equal surface roughness occurs in all surrounding areas. This avoids the power transmission element operating at different slip criticalities at different positions on the transmission plate.

  According to a further advantageous form of the invention, the speed of the reciprocating movement is varied depending on the radial position of the grinding plate on the transmission surface. Due to the reciprocating speed decreasing in the direction of the outer circumference, a ground image with unevenness in each surrounding area is avoided. Relative reciprocation can be performed by back and forth movement of the grinding plate or transmission plate.

  According to a further advantageous embodiment of the invention, two workpiece spindles are provided and the workpiece spindles are arranged relative to each other so that a reciprocating movement can be carried out over the transmission surfaces of the two transmission plates. Two transmission plates are ground with equipment having one grinding plate. Here, both workpiece spindles are adjusted so that the transmission surfaces of both transmission plates are arranged next to each other, where the conical or spherical transmission surfaces are in one plane in each case. Manufacturing time can be shortened by processing two transmission plates with equipment according to the method of the present invention. The process time can be approximately halved. Here it is clear that each workpiece spindle speed is adapted to the lengthened reciprocation stroke. According to one aspect of the invention related to this, both workpiece spindles are pivotable about a common pivot point so that a spherical jacket-shaped transmission surface can be produced. The position of the turning point is determined according to the radius of the sphere shape.

  The device according to the invention for producing a transmission plate in a continuously variable transmission mechanism comprises, according to claim 10, at least one workpiece spindle and a grinding spindle, wherein during grinding, the grinding plate along the transmission surface The grinding spindle and the transmission plate are arranged in such a way that a relative reciprocation in the radial direction with respect to the workpiece spindle axis can be performed between the transmission plate and the transmission plate. This device thus makes it possible to intentionally act on the ground image of the transmission surface. By reciprocating motion, the desired grinding image on the surface, for example cross-shaped grinding, spirally outward grinding image or other desired, instead of the uniform radial grinding image otherwise common in cylindrical grinding It is possible to produce a ground image. This device thus makes it possible to produce a transmission plate having the desired predetermined surface roughness. The relative reciprocating motion is preferably realized either by a grinding plate that can move back and forth or a transmission plate that can move correspondingly.

  According to an advantageous embodiment of the invention, a grinding spindle slider is provided which can be adjusted obliquely with respect to the workpiece spindle. With the grinding spindle slider, the grinding plate can be moved back and forth accurately and at high speed over the transmission surface to be ground. Since it can be adjusted obliquely with respect to the workpiece spindle, different conical transmission plates can be produced.

  According to a further advantageous form of the invention, the device comprises a control mechanism for allowing the relative reciprocation to be intentionally controlled. This makes it possible to intentionally change the reciprocating motion so that a predetermined surface roughness of the transmission surface of the transmission plate can be adjusted with this device. According to one aspect of the invention related thereto, the rotational speed of the workpiece spindle and the speed of the reciprocating movement can be changed by this control mechanism. In this way, various roughnesses can be produced with this device. Thus, the machining of the transmission surface can be optimized in relation to the application, i.e. in terms of slip and friction characteristics during operation of the transmission mechanism.

  According to a further advantageous form of the invention, the workpiece spindle is pivotable about a pivot point, thereby producing a “spherical” jacket-shaped transmission surface. Here, the turning point is determined according to the desired or required bending radius. The swiveling motion is also used to produce a relative reciprocating motion at the same time.

  According to a further advantageous form of the invention, the device comprises two workpiece spindles arranged to be adjustable with respect to direction and distance relative to each other. Thereby, this device makes it possible to simultaneously grind the two transmission plates and to carry out the reciprocating movement during grinding according to the invention. In this way, manufacturing time can be reduced. Since the workpiece spindles can be adjusted with respect to each other, transmission plates of various sizes with an intentionally actuated surface roughness can be produced. This also allows the cone angle to be adjusted. According to one aspect of the invention related to this, both workpiece spindles are pivotable about a common pivot point. This makes it possible to produce a spherical or deflected jacketed transmission surface.

  According to a further advantageous form of the invention, this device is part of a CNC processing center. Thereby, the transmission plate can be further processed in one facility. Thus, various processing steps before and after grinding are not necessary.

  Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 schematically shows a plan view of a grinding apparatus according to the present invention. A transmission plate having a conical surface 2 is attached to the workpiece spindle 3 as a workpiece 1. The transmission plate 1 comprises a conical transmission surface 2, i.e. the transmission plate is deflected in only one direction. However, it is clear that the transmission plate 1 may have a shape bent in two directions. A grinding plate 4 for grinding the conical transmission surface 2 of the transmission plate 1 is provided on the grinding spindle 5. The grinding plate 4 and the grinding spindle 5 are provided on the grinding spindle slider 6 so that the grinding plate 4 can reciprocate when grinding the surface 2. In addition, a control mechanism 7 is provided for enabling control of the rotational speed of the workpiece spindle 3 and the reciprocating movement of the grinding plate 4. During grinding of the transmission surface 2 of the transmission plate 1, the grinding plate 4 moves back and forth between the outer radius 2.2 and the inner radius 2.1 so that the grinding marks on the surface 2 intersect each other. Make a round trip. In this way, a cruciform grinding can be produced on the surface 2. Furthermore, this device makes it possible to intentionally act on the surface roughness of the transmission surface 2 of the transmission plate 1. By means of the control mechanism 7, it is possible in particular to adjust the rotational speed of the workpiece spindle 3 and the speed and direction of the reciprocating movement of the grinding plate 4. The further adjustment parameters are the same as in conventional grinding machines, for example the transfer of the grinding plate 4 in the direction to the surface 2 in the XY plane.

  FIG. 2 schematically shows a second embodiment of a grinding device according to the invention, which differs from the previously described embodiment in that two workpiece spindles 3, 3 'are provided. Thus, with this apparatus, it is possible to grind the two transmission plates 1, 1 ′ with equipment having a single grinding plate 4. Furthermore, both workpiece spindles 3, 3 'are arranged on the transmission surfaces 2, 2' of the transmission plates 1, 1 'so that the jacket lines of each half of the conical surfaces 2, 2' are in one plane. Oriented relative to each other to correspond to the conical shape. The grinding spindle 5 is arranged on a grinding spindle slider 6 which reciprocates from the inner radius 2.1 of the surface 2 of one transmission plate 1 to the inner radius 2.1 of the other transmission plate 1 ′. Enable. The manufacturing time for grinding the transmission surface of the transmission plate can thus be reduced.

  FIG. 3 schematically shows an alternative embodiment of the grinding apparatus of FIG. Here, instead of the movable grinding spindle slider 6, the reciprocating movement in grinding the transmission surface 2 is carried out by a work spindle 10 which is pivotable, ie pivotable so as to travel back and forth. This results in a certain radial shape, i.e. a spherical transmission surface 2, which has an intended surface roughness due to the resulting cruciform grinding. The position of the pivot point 8 determines the bending radius of the spherical jacket surface and is preferably adjustable.

  FIG. 4 schematically shows an alternative embodiment of the grinding machine of FIG. 2 with two workpiece spindles, similar to FIG. Both workpiece spindles 10, 10 ′ are arranged pivotably about a common pivot point 9, so that a reciprocating movement with respect to the workpiece spindles 10, 10 ′ is possible, while the grinding plate 4 is transferred in the Y direction. The Not only the turning point 9 but also the turning angle α can be adjusted, thereby adapting the device to different shapes of the transmission plate.

1 is a plan view schematically showing a first embodiment of a grinding apparatus according to the present invention. FIG. 6 is a plan view schematically showing a second embodiment of a grinding device according to the invention with two workpiece spindles. FIG. 2 is a plan view schematically showing an embodiment instead of the embodiment of FIG. 1. FIG. 3 is a plan view schematically showing an embodiment instead of the embodiment of FIG. 2.

Explanation of symbols

1,1 'transmission plate (workpiece), 2,2' transmission surface, 2.1 inner radius of transmission surface, 2.2 outer radius of transmission surface, 3,3 'workpiece spindle, 4 grinding plate, 5 grinding Spindle, 6 grinding spindle slider, 7 control mechanism, 8, 9 swivel point, 10, 10 'swivelable work spindle, α swivel angle.

Claims (14)

A method of manufacturing a transmission plate (1) in a continuously variable transmission mechanism, wherein at least one pair of transmission plates (1) having a transmission surface (2) are arranged to face each other, and the transmission surface is In power closed contact with the power transmission element during operation of the transmission mechanism, the method is carried out by a device having at least one workpiece spindle (3) and a grinding plate (4), the grinding plate being at least one transmission Driven over the grinding spindle (5) so as to grind the transmission surface (2) of the plate (1), the method being used when grinding the transmission surface (2), the grinding plate (4) and the transmission plate (1) ) In the radial direction relative to the workpiece spindle (3), and the grinding area of the grinding plate is transmitted. Moving back and forth between the inner radius (2.1) and the outer radius (2.2) of the surface (2), the transmission plate (1) is rotated by the workpiece spindle (3) and the transmission surface (2) The movements of the grinding plate (4) and the transmission plate (1) are synchronized with each other so that the whole is ground and a cross-shaped grinding image is produced to adjust the surface roughness of the transmission surface (2) to the desired degree. A method characterized in that. The rotational speed of the workpiece spindle (3) is characterized in that it is tuned to the relative reciprocation The method of claim 1. The rotational speed of the workpiece spindle (3), characterized in that is changed depending on the radial grinding position of the grinding plate (4) on the transmission surface (2) of claim 2 Method. The rate of reciprocation, characterized in transmission plate (1) of the transmission surface (2) on the grinding plate (4) radial position to be changed in dependence of, according to claim 1 Method. 5. A method according to any one of claims 1 to 4 , characterized in that the transmission plate (1) reciprocates. Characterized in that the grinding plate (4) makes a reciprocating motion, the method according to any one of claims 1 to 4. Two workpiece spindles (3, 3 ') are provided, and two transmission plates (1 and 1) are ground in one facility when grinding the transmission surfaces (2, 2') of the two transmission plates (1, 1 '). , wherein the relative reciprocation is performed so as to grind the 1 '), a method according to any one of claims 1 to 6. Method according to claim 7 , characterized in that the workpiece spindle (3, 3 ') pivots about a common pivot point so as to produce a spherical jacket-shaped transmission surface (2, 2'). . Method according to claim 7 , characterized in that the grinding plate reciprocates so as to produce a conical jacket-shaped transmission surface (2, 2 '). For performing the method as claimed in any one of claims 6 to an apparatus for producing a transmission plate (1) having a transmission surface for a continuously variable variable transmission mechanism, before Symbol apparatus transmitting plate A workpiece spindle (3 ) for rotationally driving (1) and a grinding plate (4) driven by a grinding spindle (5) for grinding, the central axis of the grinding spindle (5) being the workpiece spindle (3) The angle with respect to the central axis can be adjusted in the horizontal direction, and the grinding area can move between the grinding plate (4) and the transmission plate (1) while maintaining the angle,
Two workpiece spindles (3, 3 ') are provided for each receiving one transmission plate (1), the two workpiece spindles being adjustable in their direction and spacing with respect to the swivel angle α relative to each other So that the workpiece spindle shaft is moved between the grinding plate (4) and the transmission surface (2, 2 ') of the two transmission plates (1, 1') using one grinding plate (4). and wherein the relative reciprocation is effected Turkey repeated a radial direction relative apparatus. Device according to claim 10 , characterized in that the grinding plate (4) is arranged so that it can move back and forth. Device according to claim 10 , characterized in that the transmission plate (1) is arranged to be able to move back and forth. 'To produce the work piece spindle (3,3 Transmission surface (2,2)' spherical jacket shape, characterized in that) is pivotable about a common pivot point, according to claim 10 Equipment. 14. Apparatus according to any of claims 10 to 13 , characterized in that it is part of a CNC machining center.

Images