MXPA00011282A - Roll-hardening device pertaining to a roll-hardening machine for crankshafts - Google Patents

Abstract

The roll-hardening device (8) pertaining to a roll-hardening machine (1) for crankshafts (3) is configured like a pair of scissors. Two pivotable scissor arms (9 and 10) respectively comprise a roll-hardening roller head (13) or a supporting roller head (14). The supporting roller head (14) is provided with two parallel to the axis support rollers whereby the axes thereof lie on a common plane. The supporting roller head (14) is also provided with an axial guide roller which is arranged in front of the supporting rollers in a pivoting direction (35) to ensure closure. The axis of rotation of said guide roller is perpendicular to the axis of rotation of the crankshaft (3), lies on a plane forming an acute angle with the common plane of the axis of rotation of the supporting rollers and the diameter thereof is larger than the width of the supporting roller head (14) and slightly smaller than the distance between the adjacent oil films of a main or connecting rod bearing journal.

Description

FIXED ROLLER APPARATUS, OF A RODI MACHINE WHAT IS FIXED FOR CRANKSHAFTS DESCRIPTION OF THE INVENTION The invention relates to a fixed roller apparatus, of a fixed roller machine for crankshafts, having a scissors construction and where two pivoting scissor arms are positioned opposite each other and carry a fixed roller head and a support roller head, respectively; the head of the support roller has two support rollers parallel to the axis, where the axes rest in a common plane with a drive device that generates the closing and opening movement of the fixed roller tool and that also generates the force of the fixed roller . Fixed roller apparatus, of the specified type, are known from the Patent Specification German DE 197 22 308 Cl, which describes a fixed roller machine for crankshafts. In this fixed roller machine, a fixed roller apparatus can be associated with each of Ref: 125232 a main support bolt and a support bolt that carries a connecting rod of a crankshaft. The construction of the fixed roller machine is such that, during the closing of each fixed roller apparatus, first the support rollers, of the support roller head, and then the fixed rollers, of the fixed roller head, are forced against a main support bolt or against a support bolt carrying a connecting rod, wherein the head of the supporting roller and the fixed roller head each perform a pivoting movement successively. The pivoting movement of the heads of the support roller and the fixed roller, in the closing direction, involves the risk that the heads of the support roller and the fixed roller can hit the crankshaft, in the area of an oil collar , because there is only a small gap between the heads of the support roller and the fixed roller, on the one hand, and because the two oil collars, a main support bolt, or a bolt carrying a rod connection, on the other hand.

It is an object of the invention to construct a fixed roller apparatus of the specified type where the pivoting movement of the heads of the support roller and the fixed roller, in the closing direction, can not cause any impact against the crankshaft, in the region of an oil necklace This problem is solved, according to the invention, due to the feature that the head of the support roller has at least one axial guide roller, which is placed opposite the support rollers, in the pivoting direction, for the closing of the scissor arms that carry the support rollers, where the axis of rotation is perpendicular to the axis of rotation of the crankshaft and which rests in a plane comprising an acute angle with the plane of the axes of rotation of the support rollers, and whose diameter is greater than the width of the head of the support roller and slightly smaller than the separation of the oil collars from a main support bolt or from a bolt carrying a connecting rod. The invention ensures that if during the closing operation of the fixed roller apparatus, the guide roller hits an oil collar, the fixed roller apparatus is straightened in the axial direction of the crankshaft. This alignment of the fixed roller apparatus ensures that even during the pivoting movement of the fixed roller head, in the closing direction, no collision is effected between the fixed roller head and the crankshaft, in the area of an oil collar . In case the acute angle between the plane containing the axis of rotation of the axial guide roller and the common plane, formed by the axes of rotation of the two support rollers, has a value of zero, the axial guide roller has a separation with respect to the common plane. The external contour of the axial guide roller can also have not only the conventional cylindrical shape, but other forms that can be, for example, crowned or formed of various geometric shapes. For the processing of bolts having particularly wide axes, it is possible to use not only one, but several axial guide rollers which are placed in a contiguous manner and which fill the free space circumscribed by two adjacent oil collars. Usually these are two axial guide rollers whose external width is such that the two axial guide rollers are coupled to the free space between the oil collars, with a small lateral free space. This arrangement also has the advantage that the axial guide rollers are relatively small. As a result, at the same time the lateral friction between the axial guide rollers and the oil collars is reduced. The invention will now be described in more detail with reference to the figures schematically illustrating the embodiments thereof and showing: Figure 1 is a section through a fixed roller machine with a partial view of a crankshaft transport device , where a fixed roller apparatus occupies its opening position with respect to an inserted crankshaft; Figure 2 is the section, through the fixed roller machine, and a section, through a main crankshaft support bolt, where the fixed roller apparatus is in its closed position; Figure 3 is a detail A, of Figure 2, on an enlarged scale; Figure 4 is a section taken along line IV-IV, in Figure 3; and Figure 5 is a section, similar to that of Figure 3, with a special arrangement of the axial support roller. A fixed roller machine, 1, has a drive device (not shown) for receiving a crankshaft, 3, inserted by a crankshaft transport device, 2. The drive device generates the rotational movement of the crankshaft, 3, around its axis, 4, during the fixed bearing of a main support bolt, 5, and a bolt carrying a connecting rod, 6. Therefore, axis 4 rests on the axis of rotation, 7, of the device drive. However, the embodiment shown is limited to the fixed roller of a main support bolt, 5, of the crankshaft 3, because it is sufficient to explain the object of the invention.

Associated with the main support bolt, 5, there is a fixed roller apparatus, 8, of scissor construction, having two scissor arms, 9, 10; a scissors pivot, 11; a drive device, 12; a fixed roller head, 13; and a support roller head, 14. Due to the construction of scissors, the head of the fixed roller, 13, and the head of the support roller, 14, can not be moved individually in the direction along the axis of rotation. , but can only be adjusted in certain planes corresponding to the particular position of the main support bolt 5 / bolt that carries the connecting rod, to be processed along the axis of rotation, 4, of the crankshaft 3. This plane is shown as an example in Figure 3. The drive device 12 has an adjustment cylinder 15 and a force apparatus 16. The adjustment cylinder 15 generates the closing and opening movement of the scissors mentioned above, of the fixed roller apparatus 8.; the force apparatus 16 generates the force of the fixed roller. A particularly narrow construction, of the fixed roller apparatus 8, is achieved by subdividing the movements generated by the cylinders 15 and 16.

The fixed roller apparatus 8 is articulated by an articulation point, 17, with a pivoting lever, 19, which can pivot about an axis 18. The pivoting lever 19 can be pivoted by means of a pinion unit - and - indigo I, 20. The fixed roller apparatus, 8, moves in and out of the operating position by actuating the piston-and-cylinder unit, 20. The fixed roller machine, 1 , is designed in such a way that, during the closing of the fixed roller apparatus, 8, first, the support rollers parallel to the axis, 21, 22, of the head of the support roller, 14; and then, the two fixed rollers, 23, 24, of the head of the fixed roller, 13, come to rest against the main support bolt, 5. As illustrated in Figure 1, the head of the support roller, 14, performs a pivotal movement in a counterclockwise direction, 35, around the point of articulation, 17, of the head of the fixed roller, 13, performing a pivoting movement, clockwise, 37, around the pivot of the scissors, 11. The two pivoting movements, 35 and 36, are performed at the same time and when each is completed, the closing position is reached, as shown in Figure 2. The closing position corresponds to the position of operation of the fixed roller apparatus, 8. During the pivoting movements, 35, 36, of the head of the support roller, 14, and of the fixed roller head, 13, in the closing direction, any collision with one of the oil collars, 25, 26, of the main support bolt, 5 , is prevented by means of an axial guide roller, 27. The axial guide roller 27 is placed at an acute angle, 37, with a value between 0o and 45 ° and in a plane 38. The pivoting shaft 41, around which the axial guide roller 27 can be rotated, rests in a plane 38 and is perpendicular to the axis of rotation 4, of the crankshaft 3 (Figure 4). From a geometric point of view, the plane 38 also comprises the axis of rotation 4 of the crankshaft 3 -i.e., the plane 38 can swing around the axis of rotation 4. A comparison of Figures 3 and 5 clearly indicates this possibility. For example, as seen in Figure 3, the plane 38 falls on the sectional plane IV-IV -ie, the acute angle 37 is zero and the axial guide roller, 27, has a lateral separation s_ from the plane 34, on which the two axes 32 and 33 rest. In this special case, the two planes, 34 and 38, extend parallel with respect to each other. In contrast, as shown in Figure 5, the axial guide roller, 27, is inclined at an acute angle 37 greater than zero, with respect to the common plane 34, of the two axes 32 and 33, of the support rollers. particular 21 and 22. As a result of this construction, when the head of the supporting roller 14 pivots towards the closed position, in the direction of the pivoting movement 35, the axial guide roller, 27, is driven over the two supporting rollers 21 and 22. In front of the support rollers 21 and 22, the axial guide roller 25 enters the free space that is circumscribed by the gap 29a of the two oil collars, 25 and 26, on the main support pin. In this way, when the fixed roller apparatus 8 is closed, none of the support rollers, 21 or 22, strikes against one of the oil collars, 25 or 26. The axial guide roller, - 27, can have different shapes . For example, as shown in Figure 3, it has a cylindrical shape. As shown in Figure 5, the axial guide roller 27 has a multiple contour which is formed by a cylindrical portion, 39, and a conical portion 40. The axial guide roller 27 can also be constructed in a crowned manner (not shown). In the case of the support bolts 5, which have a particular width, 29a, two axial guide rollers (not shown), placed side by side, can be replaced by a single axial guide roller 27, where a guide roller is supports against the oil collar 25 and the second against the oil collar 26. Due to the scissor construction, of the fixed roller apparatus 8, the axial guide roller 27, at the same time also guides the head of the fixed roller 13 in the axial direction. The diameter 28 of the axial guide roller 27 is greater than the width 29 of the support roller head; and slightly smaller than the separation 29a, of the oil collars, 25, 26, of the main support bolt 5. In the closing position of the securing roller apparatus 8 (Figure 2), for the two free spaces, 30, 31, a clearance of approximately 0.25 mm is provided on each side, between the oil collars, 25, 26, and the guide roller 27.

List of References 1 Fixed roller machine 2 Crankshaft transport device 3 Crankshaft 4 Crankshaft rotation shaft 5 Main support bolt 6 Bolt bearing, connecting rod 7 Rotation axis of the drive device 8 Fixed roller device 9 Scissor arm 10 Scissor arm 11 Scissors pivot 12 Drive device 13 Fixed roller head 14 Support roller head 15 Adjusting cylinder 16 Force device 17 Joint point 18 Axle 19 Tilting lever 20 Unit ci I indro - and - piston 21 Support roller 22 Support roller 23 Fixed roller 24 Fixed roller 25 Oil collar 26 Oil collar 27 Axial guide roller 28 Diameter of the axial guide roller 29 Width of the head of the support roller 29a Separation of the oil collars Free space 31 Clearance 32 Support roller shaft 33 Support roller shaft 34 Plane through axis 35 Pivoting movement 36 Pivoting movement 37 Angle 38 PI anus 39 Cylindrical portion 40 Conical portion 41 Axis of rotation It is noted that, in relation to this date, the best method known by the applicant to carry out the aforementioned invention is the conventional one for the manufacture of the objects or substances to which it refers.

Claims (4)

1. CLAIMS Having described the invention as above, the content of the following claims is claimed as property. 1. A fixed roller apparatus, of a fixed roller machine for crankshafts, which is of scissors construction and where two pivoting scissor arms, placed opposite each other, carry a fixed roller head and a support roller head, respectively; the head of the fixed roller has two support rollers parallel to the axis, where the axes of rotation rest on a common plane with a drive device that generates the closing and opening movement of the fixed roller apparatus and also generates the force of the roller fixed; characterized in that the head of the support roller has at least one axial guide roller which: - is positioned in front of the support rollers, in the pivoting direction, for closing the arm of the scissors carrying the support rollers. - whose axis of rotation is perpendicular to the axis of rotation of the crankshaft and rests in a plane comprising an acute angle with the plane of the axes of rotation, of the support rollers; and - whose diameter is greater than the width of the head of the support roller and slightly less than the separation of the oil collars, of a main support bolt, or of a bolt carrying a connecting rod.
2. 2. The fixed roller apparatus, according to claim 1, characterized in that the acute angle is 0o and that the axis of rotation of the axial guide roller has a spacing (s) with respect to the plane.
3. 3. The fixed roller apparatus according to claim 1, characterized in that the guide roller has a contour that is cylindrical and crowned or that is formed of different geometric portions.
4. 4. The fixed roller apparatus, according to any of claims 1 to 3, characterized in that, associated with each of the two support rollers, there are several axial guide rollers, whose diameter is less than the width of the head of the support roller and whose external width is slightly less than the separation of the oil collars, of a main support bolt or of a bolt carrying a driving rod.