Clamping ring with a ring part having a gap and method for its manufacture

Abstract

Clamping ring with a ring part (10) interrupted by a gap (20) and at least one pin (110) projecting from the plane of the ring at its mutually facing end sections (11, 12), characterized by that the at least one pin (110) is formed by embossing a plate-shaped sheet material, so that a corresponding indentation (112, 122) is formed in the ring part (10) opposite the respective pin (110) and that the pin (110) is enclosed concentrically to it by a socket (111, 121).

Description

[0001] The invention relates to a clamping ring with a ring part interrupted by a gap and at least one pin projecting from the ring plane at its mutually facing end sections, as well as to a method for producing such a clamping ring.

[0002] A clamping ring of this type is shown in the brochure "Highest Precision in Metal" by Hugo Benzing GmbH and Co. KG. Two pins protrude perpendicular to the ring plane (normal direction) on the same side of the ring part in the two radially widened end sections on the gap side. These pins engage in matching recesses in one or more other structural components to exert a clamping effect on them in the circumferential direction. German patent application No. 10 2014 115 727.3, which was not published prior to this date, also specifies a clamping ring with two pins protruding in the normal direction of the ring plane in the gap-side end sections, but which protrude on opposite sides of the ring part.

[0003] With clamping rings of this type, wear can occur in the area of ​​the pins and the corresponding recesses in the structural components after prolonged use, which in the long term affects the precision of the interaction of the parts.

[0004] DE 12 79 712 A shows a suspension clamp for electrical conductors of overhead line wires with pivots made of soft metal, such as aluminum. Such a metal is not suitable for the manufacture of clamping rings.

[0005] DE 830 716 B discloses a retaining ring and a method for its production, which serves as an artificial shoulder to prevent axial displacement of machine parts on a shaft or in a housing. The slotted retaining ring has openings in its widened slot-side end sections. To produce it, a metal strip is fed into a press consisting of a die and punch, the punch being provided with a bevel on its outer cutting edge. As the die descends, its inner edge immediately cuts into the strip, while its outer edge first bends the material inward to the slope of the bevel and then cuts into the strip and finally through the strip. There is no mention of producing protruding pins.

[0006] DE 23 11 585 A discloses a feed device for retaining rings and a method for manufacturing such a feed device. In this process, successive sections of a strip, particularly made of steel, are fed step by step into a punching press, and at the end of each step, parts are punched out of the respective strip section located in the punching press, so that the remaining parts of the respective strip section form retaining rings that are connected to one another along narrow surface areas. Here, too, no information is provided regarding protruding pins.

[0007] The object of the present invention is to provide a clamping ring of the type mentioned at the outset and a method for its production, with which a permanently high precision in use is achieved.

[0008] This object is achieved with the features of claim 1. Here, it is provided that the at least one pin is formed by stamping, so that a depression is formed in the ring part opposite the pin and that the pin is enclosed concentrically to it by a bushing. The method for producing the clamping ring is characterized by the steps: producing the clamping ring with a gap from plate-shaped sheet material, wherein in the end sections facing one another in the gap region, protruding pins are formed by stamping on the two opposite sides in the direction normal to the ring plane, and pressing a respective bushing onto the pins.

[0009] The bushing, which is securely mounted concentrically to the respective pin, enlarges the outer circumference of the projection consisting of the pin and bushing. The resulting increased radius of curvature creates an enlarged contact surface on the inner circumference of the corresponding recess in the structural components. The interacting enlarged surface areas of the projection and recess significantly increase the service life of the interacting parts in the area of ​​the projection and recess, thus ensuring high precision over the long term, particularly when, as in typical applications, the projection and recess are usually only subjected to particular stress in limited circumferential areas. For example, the clamping rings are used to adjust the tooth flanks of adjacent gear parts of a gear.

[0010] The fact that the bushing is fixed to the pin in a non-rotatable manner relative to it contributes to a long service life.

[0011] For high wear resistance, it is also advantageous that the bushing has a greater hardness than the pin.

[0012] Advantages for the design and production are further obtained by the fact that the bushing is open on the front side of the pin.

[0013] Further advantages for the structure and function arise from the fact that the front outer side of the socket and the pin are in approximately the same plane.

[0014] While the pins can be arranged on the same side of the clamping ring, a design that is advantageous for many applications involves a pin in each end section, with the two pins projecting on opposite sides relative to the ring plane.

[0015] The measures that the end sections are widened radially outwards compared to the adjoining ring part also contribute to an advantageous structure and an advantageous function.

[0016] An advantageous procedure for production and precise manufacturing is that the clamping ring is produced from the sheet material by fine blanking, whereby firstly the ring contour is cut free in the end section near the pin protruding on one side in such a way that in the contour area adjacent to this pin cutting burrs only arise on the side of the ring part facing away from the pin, and then the ring contour is finish-cut from the other side of the sheet material, that the clamping ring is hardened after finish-cutting and then deburred by tumbling and that subsequently the bushings are pressed on, which have previously been brought to a greater hardness than the pins.

[0017] The invention will be explained in more detail below using exemplary embodiments with reference to the drawings. In the drawings: Fig. 1A, Fig. 1B and Fig. 1C shows an embodiment of a clamping ring in a plan view, a sectional view along a section plane AA and in a perspective view and Fig. 1D one in Fig. 1B shows detail B of the clamping ring.

[0018] The Fig. 1A, Fig. 1B and Fig. 1C show a clamping ring 1 with a gap 20, in which a first and a second gap-side end section 11, 12 with pins 110 projecting perpendicularly (in the normal direction) to the ring plane (only one of which is visible), in plan view, in a side sectional view, and in perspective view, respectively. Fig. 1D is a detail B of the Fig.1B with the first end section 11 and the pin 110 formed therein, shown enlarged in a sectional view.

[0019] The end sections 11, 12 opposite one another in the gap region are radially widened compared to the adjoining section of the ring part 10, specifically outwards in the illustrated embodiment. The pins 110 projecting in the two end sections 11, 12 in the normal direction to the ring plane project on the opposite sides of the ring part 10, i.e., in opposite directions. The ring part 10 with the end sections 11, 12 is made of a metal with elastic properties, which is preferably hardened. The pins 110 are preferably formed by stamping (or by penetration) of a plate-shaped sheet material, so that a corresponding depression or impression 112, 122 is formed in the ring part 10 opposite the respective pin 110.The embossing of the pins 110 can be carried out in the plate-shaped sheet material from which the ring part 10 is made by fine blanking, before or after the fine blanking.

[0020] The pins 110 are circumferentially enclosed by a cylindrical bushing 111, 121, which is pressed onto the respective pins 110, so that the bushings 111, 121 are held non-rotatably on the pins 110. The bushings are open on their side facing the end face of the pin and, in the preferred embodiment shown, end flush with the end face or the most protruding area thereof with their (outer) end face. It would also be conceivable for the bushings 111, 121 to cover the respective end face of the pins 110 with an outer base part. However, the open, annular design of the bushings 111, 121 shown has advantages in manufacturing and assembly.From a top view, the bushings are preferably located circumferentially within or at most flush with the outer contour of the respective end sections 11, 12, which in most applications offers advantages for installation compared to a design that extends beyond the outer contour. The bushings 121, which are also made of metal, preferably have a higher hardness than the pins 110 or the ring part 10 with the end sections 11, 12.

[0021] The pressed-on bushings enlarge the circumferential contact surface in corresponding recesses or bores of structural components (such as associated gears) when installed. This alone achieves a significant reduction in wear compared to smaller-diameter pins, thus maintaining high precision over the long term. Furthermore, the higher hardness of the bushings 121 contributes significantly to wear reduction, especially if the recess or bore corresponding to the projection of the pin and bushing in the structural components to be fitted with the clamping ring 1 is also hardened.

[0022] The clamping ring 1 can be manufactured according to the description in the aforementioned German patent application No. 10 2014 115 727.3, according to which the respective bushings 111, 121 are fastened to the pin 110, in particular pressed on.

[0023] Accordingly, the clamping ring 1 is advantageously manufactured in such a way that protruding pins are produced by stamping on both opposite sides of a flat sheet material in the area of ​​a ring contour, specifically in the end sections 11, 12 of the ring part 10. After the ring contour has been cut out by fine blanking, burrs created are removed by deburring. Preferably, during fine blanking, prior to a finish-cutting step (complete cutting out of the ring contour), a free cutting by punching is first carried out in the area surrounding only one pin in such a way that the resulting punching burrs are created on the side of the associated end section opposite this pin.The final cutting is then carried out by punching from the opposite side of the sheet material, so that in the remaining area of ​​the ring part 10, which has not yet been contoured by the free cutting, the punching burrs are created on the side opposite the other pin in question. This procedure has the advantage that all punching burrs of the ring part 10, in particular also in the area of ​​both pins 11, 12, are created on the side of the ring part 10 opposite the pins and can then be deburred without hindrance, with deburring preferably being carried out by tumbling using tumbling stones. After final cutting, preferably before deburring, the clamping ring is hardened. After deburring or tumbling, the bushings 121 are attached to the pins 110, preferably by pressing, as mentioned above.

Claims

[1] Clamping ring with a ring part (10) interrupted by a gap (20) and at least one pin (110) projecting from the ring plane at its mutually facing end sections (11, 12), characterized by , that the at least one pin (110) is formed by stamping a plate-shaped sheet material, so that a corresponding recess (112, 122) is formed in the ring part (10) opposite the respective pin (110) and that the pin (110) is enclosed concentrically to it by a bushing (111, 121). [2] Clamping ring according to claim 1, characterized by that the bushing (111, 121) is fixed to the pin (110) in a non-rotatable manner relative to the latter. [3] Clamping ring according to claim 1 or 2, characterized by that the bushing (111, 121) has a greater hardness than the pin (110). [4] Clamping ring according to one of the preceding claims, characterized bythat the bushing (111, 121) on the front side of the pin (110) is open. [5] Clamping ring according to one of the preceding claims, characterized by that the front outer side of the bushing (111, 121) and the pin (110) lie approximately in the same plane. [6] Clamping ring according to one of the preceding claims, characterized by that a pin (110) is arranged in each end section (11, 12) and the two pins (110) protrude on the opposite sides with respect to the ring plane. [7] Clamping ring according to one of the preceding claims, characterized by that the end sections (11, 12) are radially outwardly widened relative to the adjoining ring part (10). [8] Method for producing a clamping ring according to claim 1, characterized by the procedural steps - producing the clamping ring with a gap from plate-shaped sheet material (3), wherein in the end sections facing each other in the gap area, projecting pins (110) are formed by stamping on the two opposite sides in the direction normal to the ring plane, and - Pressing a respective bushing (111, 121) onto the pins (110). [9] Method according to claim 8, characterized bythat the clamping ring is produced from the sheet material by fine blanking, wherein firstly the ring contour is cut free in the vicinity of the pin projecting to one side in the end section in such a way that in the contour area adjacent to this pin cutting burrs are formed at most on the side of the ring part (10) facing away from the pin, and then the ring contour is finish-cut from the other side of the sheet material, that the clamping ring is hardened after finish-cutting and then deburred by tumbling and that subsequently the bushings (111, 121) are pressed on, which bushings have previously been brought to a greater hardness than the pins.

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