Abstract
A positioning arrangement for positionally accurate connection of a basic component to a centering component for achieving axial centricity of a basic component axis and a centering component axis relative to one another, wherein at least three but no more than six positioning pins are arranged and anchored in the centering component and reach into pin holes in the basic component, forming a positive-locking connection, wherein the basic component and the centering component are connected and positioned relative to one another.
Claims
1-8. (canceled)
9. A positioning arrangement for positionally accurate connection of a basic component to a centering component in order to achieve axial centricity of a basic component axis and a centering component axis relative to one another, the positioning arrangement comprising: at least three positioning pins arranged and anchored in the centering component and reaching into pin holes in the basic component, thereby forming a positive-locking connection, wherein the basic component and the centering component are connected and positioned relative to one another.
10. The positioning arrangement according to claim 9, wherein there are five of the positioning pins arranged in the centering component and there are five corresponding pin holes arranged in the basic component.
11. The positioning arrangement according to claim 9, wherein the positioning pins are arranged around the centering axis with equal spacing to the centering axis.
12. The positioning arrangement according to claim 9, wherein the positioning pins are arranged such that they are distributed equidistantly across a perimeter of a circle around the centering axis.
13. The positioning arrangement according to claim 9, wherein the positioning pins are arranged with random distribution around the centering axis.
14. The positioning arrangement according to claim 9, wherein a central cylindrical stud is also provided in the centering component and a central cylindrical recess is formed in the basic component for positioning.
15. The positioning arrangement according to claim 9, wherein the positioning pins are produced from steel and anchored in the centering component, itself produced from aluminum.
16. A scroll compressor comprising: a fixed scroll; and an orbiting scroll, wherein the fixed scroll includes five positioning pins arranged in the compressor housing in axial centricity with a shaft of the compressor.
Description
BRIEF DESCRIPTION OF DRAWINGS
[0024] Further details, features and benefits of embodiments of the invention result from the following description of embodiment examples with reference to the accompanying drawings. These display the following:
[0025] FIG. 1: Positioning arrangement using positioning studs as per the state of the art,
[0026] FIG. 2: Positioning arrangement using positioning pins as per the state of the art,
[0027] FIG. 3: Positioning arrangement with two positioning pins,
[0028] FIG. 4: Positioning arrangement with five evenly distributed positioning pins,
[0029] FIG. 5: Positioning arrangement with five unevenly and randomly distributed positioning pins,
[0030] FIG. 6: Positioning arrangement with uneven distribution of the positioning pins in rows,
[0031] FIG. 7: Diagram of axial offset in the form of relative axial offset as a function of the positioning pins via the number of positioning pins,
[0032] FIG. 8: Diagram of the relative reduction in axial offset achieved by increasing the number of positioning pins,
[0033] FIG. 9: Diagram of the relative radial offset when using two positioning pins,
[0034] FIG. 10: Diagram of the relative radial offset when using five positioning pins,
[0035] FIGS. 11A and 11B: Positioning arrangement for scroll compressors with two positioning pins and
[0036] FIGS. 12A and 12B: Positioning arrangement for scroll compressors with five positioning pins.
DETAILED DESCRIPTION OF AN EMBODIMENT
[0037] FIG. 1 shows a positioning arrangement as per the state of the art, in which a centering component 3 exhibits a central cylindrical stud 1 that engages in the central cylindrical recess 2 on a basic component 4. The central cylindrical stud 1 is produced at minimal costs as a cylindrical stud of a defined diameter. Corresponding to this, the central cylindrical recess 2 is produced in the form of a cutout or hole, into which the stud is inserted and engaged. The manufacturing tolerances for the stud and the hole result in a certain amount of play, which in turn can cause the centering component 3 in the basic component 4 to move. The centering component axis 5, shown as a broken line, exhibits an offset relative to the basic component axis 6, which is shown as a solid line. The offset of the two axes 5, 6 is also referred to as component or axial offset. The offset of the components relative to one another is shown as a broken line in the plan view of centering component 3. The axes are shown as offset by one plane relative to one another as intersecting points of the guiding lines.
[0038] FIG. 2 shows another embodiment as per the state of the art for connecting a centering component 3 to a basic component 4. Here, the positioning arrangement is extended to include positioning pins 7, which are arranged in the centering component 3 and shown opposite. The positioning pins 7 are permanently anchored in the centering component 3 here. The basic component 4 exhibits pin holes 9, produced as boreholes, into which the positioning pins 7 are inserted, thereby establishing a positive-locking and positioning connection. The positioning pins 7 are themselves preferably produced with a circular cylinder shape. As a result of the manufacturing tolerances for the positioning pins 7 and the pin holes 9, the centering component axis 5 and the basic component axis 6 are subject to an offset and thereby to reduced axial centricity of the centering component axis 5 relative to the basic component axis 6. In the plan view of the centering component 3, the offset of the positioning pins 7 in the pin holes 9 is shown as a sectional view.
[0039] FIG. 3 provides a perspective depiction of the positioning arrangement as per FIG. 2, wherein additional positioning pins are indicated, but not explicitly shown.
[0040] FIG. 4 shows the preferred embodiment according to the invention with use of a positioning arrangement with five positioning pins 7. The positioning pins 7 are recessed and fixed in the centering component 3 here. The centering component 3 has a centering component axis 5, which is produced with minimal axial offset to the basic component axis 6 with the pin holes 9 for the positioning pins 7 of the centering component 3. As per FIG. 4, the positioning elements, i.e. the positioning pins 7 that engage in the pin holes 9, are arranged equidistantly (with even spacing) around the perimeter of a circle surrounding the centering component axis 5.
[0041] FIG. 5 shows the positioning system as a positioning arrangement with five positioning pins 7 on the centering component 3, although with uneven distribution. The uneven distribution of the positioning pins 7 and the arrangement of the pin holes 9, correspondingly distributed on the basic component 4, permits error-free angular alignment and positioning of the components relative to one another, as any twisting of the centering component 3 relative to the basic component 4 as a result of the random arrangement of the positioning elements is effectively prevented during installation.
[0042] FIG. 6 shows the positioning arrangement in an alternative embodiment with uneven distribution of the positioning pins 7 and the corresponding pin holes 9. The centering component axis 5 of the centering component 3 can be mounted with low axial offset relative to the basic component axis 6.
[0043] FIG. 7 shows a diagram that depicts the relative axial offset of the embodiment as per FIG. 3 with two positioning elements to the embodiment as per FIG. 4 with five positioning pins. The lower x-axis shows the number of positioning pins here, while the left-hand ordinate shows the average relative axial offset, referenced to the embodiment with two pins, as a function of the number of positioning pins. The additional manufacturing and installation effort is suggested on the upper x-axis by taking into account the larger number of pins. Here, the referenced average relative axial offset is shown as a function of the number of pins. The right-hand ordinate shows the ratio of the sum of all pins, including the positioning pins, and the sum of pins to date.
[0044] FIG. 8 shows the weighted effect of the additional pins. Since the improvement that can be achieved over an embodiment with two pins by increasing the number of positioning pins from four to five corresponds to or even surpasses the improvement that can be achieved through use of an “endless” number of pins in addition to the embodiment with five pins, a number of five pins is considered optimal for real-world use. On the hand, the number of positioning elements is also restricted by the installation space available inside the mechanical arrangement, which is why the number of pins must also remain limited for reasons of practicality.
[0045] The depictions show that a total reduction of around 25 percent in both the maximum axial offset to be anticipated and the average axial offset can be achieved by increasing the number of positioning elements from 2 to 5.
[0046] The x-axis shows the number of positioning pins used. The left-hand ordinate shows the reduction in relative offset, referenced to an embodiment with two pins, as well as the additional relative effort required to introduce another pin, referenced to the existing number of pins in the positioning system. The right-hand ordinate shows the relative reduction in axial offset per additional pin, referenced to the embodiment with two pins.
[0047] FIG. 9 shows the relative offset with two positioning elements as a quantile. For an embodiment with matched levels of rated play and tolerances of the positioning concept, it depicts, referenced to an embodiment with just one guide element, the proportion of a relative offset greater than 0.4, the proportion with offset of between 0.4 and 0,55, as well as between 0.55 and 0.96 relative to the possible offset of 1.0 for a guide element.
[0048] FIG. 10 shows the relative offset when using five positioning elements, wherein the error up to 0.4 drops to a low proportion and the proportion with a referenced relative axial offset drops to between 0.4 and 0.55. Only a very small proportion of a basic total exhibits an axis error greater than 0.55, wherein 0.74 was determined as the greatest referenced deviation. The depictions clearly demonstrate that significant improvements in average axial offset can be achieved by using five instead of two positioning elements.
[0049] Both the average axial offset of the units fitted and the maximum radial axis position errors are thereby reduced.
[0050] FIGS. 11A and 11B show an embodiment of a positioning arrangement with perspective views from various sides. The rotating basic component 4 with the shaft 8 shows the driven element of a scroll compressor with the pin holes 9 as per the state of the art. As depicted, the centering and basic component axes 5, 6 are ideally positioned above one another, while the centering component 3, here the orbiting scroll 10, is prepositioned in the assembly position. FIG. 11B shows the centering component 3 as an orbiting scroll 10 with the two positioning pins 7.
[0051] FIGS. 12A and 12B show, similarly to FIGS. 11A and 11B, the basic component 4 and centering component 3 as an orbiting scroll 10 with a positioning arrangement that employs five positioning pins 7 with corresponding insertion into the pin holes 9.
[0052] The use of the positioning arrangement shown for a scroll compressor is exemplary. Minimizing axial offset in the scroll compressor facilitates a significant improvement in terms of operating noise, as well as a reduction in wear to the orbiting scroll 10.
LIST OF REFERENCE NUMBERS
[0053] 1 Central cylindrical stud [0054] 2 Central cylindrical recess [0055] 3 centering component [0056] 4 Basic component [0057] 5 centering component axis [0058] 6 Basic component axis [0059] 7 Positioning pin [0060] 8 Compressor shaft [0061] 9 Pin hole(s) [0062] 10 Orbiting scroll
