• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A screw actuated press unit for mounting parts with press fit, comprising a casing (10), an actuating screw (14) rotationally journalled in the casing (10) and coupled to a rotation motor (11), a nut assembly (22) cooperating with the actuating screw (14), a thrust rod (24) rigidly connected to the nut assembly (22) and extending out of the casing (10) for connection to a work piece, and a locking device (28-33) effective to rotationally lock the nut assembly (22) to the casing (10) at rotation of the actuation screw (14), wherein the lock device (28-33) comprises three roller studs (28-30) mounted on and radially extending from the nut assembly (22) and arranged to guidingly cooperate with two parallel guide rails (32,33) at the edges of an axially extending slot (31) in the casing (10). The roller studs (28,29,30) are spring biased in opposite directions into contact with the guide rails (32,33) so as to eliminate rotational play between the nut assembly (22) and the casing (10).
    公开号:SE1150907A1
    申请号:SE1150907
    申请日:2011-10-03
    公开日:2013-04-04
    发明作者:Kjell Thomas Martin Eriksson
    申请人:Atlas Copco Ind Tech Ab；
    IPC主号:
    专利说明:

    Arrangements have also suffered not only from unacceptable mechanical wear but also from a less precise control of the nut / push rod due to the fact that in many applications very high demands are placed on the accuracy of the longitudinal movement of the push rod and thus on the rotational movement of the nut. It is difficult to achieve a play-free engagement between the nut and the keyways in the housing, this is due to the fact that sliding contact surfaces inevitably require a small but still clearance between them to ensure a squeeze-free operation and the carrying of a certain lubricant.
    An object of the invention is to provide a screw-driven press unit where the rotational locking of the linearly displaced nut in relation to the housing is obtained and thereby a high level of accuracy for the push rod movement is ensured.
    Another object of the invention is to provide a screw-driven pressing unit in which the length of the housing is not adversely affected and where the service life of the rotation-locking means is substantially extended.
    Additional objects and advantages of the invention will become apparent from the following description and from the claims.
    A preferred embodiment of the invention will be described in detail in the following with reference to the accompanying drawing figures.
    In the drawing figures: Fig. 1 is a perspective view of a press unit according to the invention.
    Fig. 2 is a top view of the press unit of Fig. 1.
    Fig. 3 shows, partly in section, a longitudinal view of the pressing unit in Fig. 1. Fig. 4 shows a cross-section laid along the line B-B in Fig. 3.
    Fig. 5 shows on a larger scale and partly in section a detailed view of the nut and roller arrangement.
    The press unit shown in the drawing figures comprises a main housing 10 and an electric rotary motor 11 attached thereto, which has a connection piece 12 for a multi-core cable for transmitting power and control signals between the press unit and a separate control unit (not shown). In the housing 10 there is a rotationally mounted drive screw 14 which is connected to the motor 11 via a reduction gear 15. This is located at the rear end wall 13 of the housing 10 and comprises a razor gear 16 which is rigidly attached to the screw 14. The screw 14 is supported at its rear end by three ball bearings 17, 18 and 19 which are of the angular contact type for transmitting radial and axial forces from the screw 14 to the housing 10. The bearings 17, 18 and 19 are supported in a common mounting sleeve 20, which is fixed in the rear end wall 13 while transmitting a thin-walled neck 21. Mounted on this neck 21, which can be elastically deformed in response to the load to which it is subjected, is a strain gauge (not shown) for delivering signals in response to the axial load applied to the bearings 17, 18 and 19 and corresponding to the compressive force provided by the press unit. As shown in Fig. 4, the press unit is provided with an external connector 23 for wire signal communication with the strain gauge on the bearing mounting sleeve 20.
    The drive screw 24 is arranged to cooperate with a nut arrangement 22 for converting the rotational movement of the screw 14 into a linear movement. Rigidly connected to the nut arrangement 22 is a tubular push rod 24 which protrudes from the housing 10 to be connected to a workpiece. The push rod 24 is supported by a smooth bushing 25 at the front end of the housing 10 and the screw 14 is radially supported on the inner wall 26 of the push rod 24.
    The nut arrangement 22 is preferably of a type having a number of planetary screw elements (not shown) for co-operation with the screw 14. This type of construction is previously known in the current type of press units, and a detailed description is therefore omitted. The great advantage of this construction of nut arrangement lies in a large total contact area between the nut arrangement 22 and the screw 14, which provides a low level of mechanical wear.
    In accordance with the invention, the nut arrangement assembly 22 is provided with three anti-rotation, radially directed locking elements in the form of roller pins 28, 29 and 30. These roller pins are placed in a common axially directed row and extend laterally through an axially directed slot 31 in the house. The roller pins 28, 29 and 30 are arranged to cooperate with two parallel guide rails 32, 33, which are arranged at the edges of the slot 31. The roller pins 28, 29 and 30 are loaded into roller engagement with the guide rails 32, 33 by a leaf spring element 36. to eliminate any rotational gap between the nut arrangement 22 and the housing 10. The roller pins 28, 29 and 30 comprise needle bearings for rotation under low friction and are arranged in such a way that the roller pin 29, which is located in the middle of the three, is loaded of the spring element 36 against one of the guide rails 33, while the two other roller pins 28, 30 are loaded as a reactive action in the direction of the opposite guide rail 32. For realizing this double-acting contact engagement with the guide rails 32, 33, the intermediate roller pin 29 is supported on a bearing block 34, which is movably guided in a transverse direction relative to the nut arrangement 22 and the two other roller pins 28, 30. The leaf spring element 36 is with its ends supported in the grooves 35a, b in the nut arrangement 22 and arranged to exert a prestressing load on the bearing block 34. See Fig. 5. This arrangement ensures that there will be no play between the nut arrangement 22 and the housing 10 as long as the reaction force on the nut arrangement 22 does not overcome the biasing load of the spring element 36. For a greater outward pressing force from the press unit, a stronger leaf spring element 36 should be selected to counteract the higher reaction moment on the nut arrangement 22 and to ensure a loose locking of the nut arrangement 22 to the housing arrangement 22. 10. However, it is important that the spring load on the rollers 28, 29 and 30 is not unnecessarily large, because the higher the contact pressure between the rollers 28, 29 and 30 and the guide rails 32, 33, the higher the mechanical wear of the affected parts to be.
    In operation, the motor 11 is connected to a power source and to the control unit to cause the motor to operate in accordance with a predetermined program, i.e. to obtain a certain pressing force at a desired axial stroke of the push rod 24. The push rod 24 is also provided with a suitable work tool for engaging the workpiece in question. In the starting position of the unit, the nut arrangement 22 assumes its rearmost position close to the rear end wall 13, which means that the push rod 24 assumes its maximum retracted position, as shown in the drawing figures. When the press unit is to be started, a signal is sent to the motor from the control unit, which results in an initiated rotational movement of the reduction gear 15 and the drive screw 14. The threaded engagement between the drive screw 14 and the nut arrangement 22 results in a linear movement of the nut arrangement 22 and the push rod 24. for this, the nut arrangement 22 is prevented from rotating in the housing 10. This is accomplished by engaging the housing 10 of the rollers 28, 29 and 30 and the guide rails 32, 33 of the housing 10. Upon continued rotation of the drive screw 14, the push rod is able to perform their task, namely to press two parts together via a press fit by applying a compressive force to them. During its movement along the drive screw 14, the nut arrangement 22 is constantly locked against rotation by the low friction engagement between the rollers 28, 29 and 30 and the guide rails 32, 33. The spring bias of the roller pins 28, 29 and 30 against the guide rails 32, 33 ensures that there will be no rotational gap between the nut arrangement 22 and the housing 10.
    The reaction force resulting from the force applied to the pressure rod 24 is transmitted to the housing 10 via the ball bearings 17, 18 and 19, the mounting sleeve 20 and the rear end wall 13. The magnitude of the reaction force and thus the pressure exerted is indicated by signals supplied by the strain gauge on the soft neck portion 21 of the mounting sleeve 20, and these signals are compared with data programmed into the control unit, after which an OK or a NO-OK signal is emitted to indicate to the operator that the operation has been performed satisfactorily. In particular, the position in which the intended press work is completed is very important and it is determined by data stored in the control unit. An accurate position indication is obtained with a rotation angle / sensor on the motor. A linear motion / position sensor on the push rod 24 would not give an indication that is accurate enough to control the process in accordance with the high requirements that usually apply.
    When the intended pressing work is completed, the motor is stopped and reversed, which means that the drive screw 14 begins to rotate in its opposite direction, whereby the nut arrangement 22 changes direction of movement and causes a reciprocating movement on the push rod 24.
    It is to be noted that the invention is not limited to the example shown and described but can be varied freely within the scope of the claims.
    权利要求:
    Claims (4)
    [1]
    A screw-driven press unit comprising a housing (10), a drive screw (14) rotatably mounted in the housing (10), a rotary motor (11) coupled to the drive screw (14) for driving it, a nut arrangement (22 ) cooperating with the drive screw (14), a push rod (24) rigidly connected to the nut arrangement (22) and extending out of the housing (10) for connection to a workpiece, and a locking device (28-33) operating to lock the nut arrangement (22) to the housing (10) and at the same time allow axial movement of the nut arrangement (22) when the drive screw (14) rotates, characterized in that said locking device comprises two or more roller pins (28-30) extending radially and are mounted on the nut arrangement (22) in a common, axially directed row, and a slot (31) extending axially in the housing (10) in the housing (10) and two parallel guide rails (32, 33) , which are arranged on the edges of said slot (31), said roller pins (28, 30 ) engages the said guide rails (32, 33) to prevent rotation of the nut arrangement (22) during the operation of the press unit.
    [2]
    Press unit according to claim 1, in which a spring element (36) is arranged to exert a prestressing force on said roller pins (28-30) against said guide rails (32-33) in order to eliminate rotational play between the nut arrangement (22 ) and the house (10).
    [3]
    Press unit according to claim 1, in which said roller pins (28-30) are three in number and arranged in a common, axially directed row and the one (29) of said three roller pins (28-30) which are located in the middle between the two second roller pins (28-30), the said spring element (36) is pressed against one of the said guide rails (32), while the two other roller pins (28, 30) are pressed against the opposite guide rail (33).
    [4]
    Press unit according to claim 3, in which said roller pin (29) located in the middle between the two other roller pins (28, 30) is supported on a bearing block (34), which is movably guided in a transverse direction in relation to - landing to the nut arrangement (22) and said spring element (36) is a leaf spring which is supported with its ends in grooves (35a, b) in the nut arrangement (22) and biased against said bearing block (34).
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