JPH02500578A - Drive device for generating planetary motion - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Drive device for generating planetary motion The invention provides that the table can be driven by a form-complementary traction transmission. is also connected to one eccentric transmission, which eccentrically passes through the hollow shaft. Particularly when producing molded parts by grinding, which are formed by eccentric shafts Generating planetary motion for a table supported on the machine table of a profiling grinding machine The present invention relates to a drive device for.

Typical areas of use for such drives are parts, die casting tools and molds. A special method for producing electrodes for recesses obtained by electrical discharge machining for forging. This is the processing of molded products made of graphite.

This known method is particularly useful for the production of structural parts of complex, geometrically precise and high-value materials. used sometimes.

In particular, published European patent application no. 0118606 has the same spatial geometry. Produce electrodes with a predetermined spatial shape using profile grinding tools with different (larger) dimensions. Discloses a machine for doing so. In this connection, the table on which the workpiece is fixed is A drive device for planetary motion is also disclosed. In this case, two similar An eccentric drive is used. Each of these eccentric drives is fixed to the machine stand. It is supported in the casing and driven by a motor with a toothed belt.

Adjustment of the predetermined eccentricity takes place via an electric motor specially provided for this purpose. child At the same time, the stroke cylinder causes the clutch acting on the inner shaft to manipulated, the inner shaft is removed from the sleeve surrounding it or the inner The shaft is released for drive by an electric motor. After reaching the desired eccentricity, The two parts are separated from each other again and the inner shaft is fixed in the sleeve by the force of the spring. Concatenated.

Furthermore, in profiling grinding machines used in industry, the processing table is moved in a planetary motion. Drive devices for this purpose are known. This drive unit is connected to the processing table. Eccentric transmissions are driven by an electric motor via a drive belt using an additional drive unit. It is driven by

The drive unit has a casing mounted on the machine platform. to this casing supports a sleeve connected to an electric motor by a drive gear.

A shaft for driving the eccentric shaft of the eccentric transmission, which is connected to the drive gear, is connected to the sleeve. You will be guided through the bu. The sleeve and the upper end of the shaft are connected by a planetary gear system. It is. In this case, the sleeve supports an internal gear, which meshes with three It is connected by a pair of planetary supports to a sun gear fixed to the shaft. planetary support The body is supported on a planetary support driven by a stepper motor. this planet The support changes the rotational speed ratio of sleeve and shaft via the planetary gear connection. is transmitted to the eccentric transmission.

Since large drive loads are transmitted, the drive unit is housed in a case and requires lubrication and It is equipped with an oil sump for water and cooling. The drive unit rotates through the sleeve of the drive unit. The dynamic belt meshes with a drive gear provided in the sleeve of the eccentric transmission, and The drive gear of the shaft of the drive (secondary) drives the drive gear of the eccentric shaft of the eccentric transmission. side Only during the centering change the sleeve and shaft have different rotational speeds. Eccentric transmission pickpocket The tube is supported in the casing and has a through hole offset by the maximum eccentricity with respect to the axis of rotation. We are prepared. This through hole has an eccentric end formed by a crank pin. .

This crank pin is supported on the processing table.

This known drive structure has parts that are used over a wide range and are subject to some wear. Therefore, manufacturing costs, operating costs, maintenance costs are high, and the weight is high. Relatively heavy. This weight results in undesirable efficiency. Therefore, a large drive output is required. In addition, the operating condition becomes sluggish. Driving without play is impossible, and a large Pace is necessary. Due to the large loads, special cooling or lubrication of this drive is necessary.

It is therefore an object of the invention to eliminate the above-mentioned drawbacks. Thereby, the desired The driving principle should be obtained, and high reliability and accurate operation should be achieved.

In the present invention, the above problem is solved by moving the table at the same speed and in the same direction parallel to the free movement of the table. Two rotating drive mechanisms or traction transmissions are provided, and the drive mechanisms or The traction transmission is drive-coupled to one of the two station drive shafts of the eccentric transmission, and the drive An adjustment device that can change the amount of adjustment of the eccentric transmission is installed on either the mechanism or the traction transmission. This is solved by adding a location.

This drive principle makes operation in dusty conditions very demanding for the operator and the machine. It has been demonstrated that the structure is simple and simple. Therefore, the accuracy will increase Therefore, the quality is improved and the reliability of the profile grinding machine is improved.

The machine table provides additional considerations when using eccentric transmissions with this drive. Among them, for example, a parallelogram guide of the shaft is required.

As a form-complementary drive mechanism, toothed bells provide the precision required in eccentric transmissions. You can use strings, chains, etc.

To change the eccentricity, one of the two stationary motion mechanisms can be used, and the other can be You can also use it.

The circulation direction of the drive mechanism relative to the machine table or the rotation mechanism of the eccentric transmission can be freely selected. It is possible.

In particular, the drive device of the invention comprises at least two eccentric transmissions drivingly connected to the table. Suitable for equipment. In this case, at least one draft is provided in each traction transmission. An inner roller is attached, and the drive mechanism is partially wrapped around this guide roller to guide the The roller expands the section of the drive mechanism together with the eccentric transmission and adjusts the eccentric transmission. In order to An adjustment device is provided which causes an additional rotational movement of the hollow shaft to the eccentric transmission. Ru.

Drives with at least two eccentric transmissions can be operated with one guide roller. It is Noh. In this case, the guide roller is formed so that it can be driven only in one direction of rotation. , a drive mechanism formed between the guide roller and the eccentric transmission and flexibly stretched. The section of the structure that follows from the guide gate is connected to an operating mechanism that can change the length. It is. In this case, an additional rotation of the drive shaft of the eccentric transmission for adjustment is ensured. A drive mechanism or traction transmission used for the adjustment of an eccentric transmission in order to The guide rollers must not be drivable in the direction opposite to the direction of circulation. This fruit Shapes likewise benefit from the benefits of the invention.

A guide roller that guides the drive mechanism in a parallel plane displaced laterally with respect to the eccentric transmission. between the eccentric transmission and the guide roller, which is slidable at least approximately parallel to the eccentric transmission and the guide roller. A pair of flexible rollers is provided, and a section that passes between the pair of rollers and wraps around the roller is provided. guided and thereby formed between each one eccentric transmission and the guide roller Embodiments of the invention in which the length of the section of the drive mechanism, which is It turned out to be advantageous. This implementation is the optimal solution from an economic point of view This has been proven. Because this embodiment achieves the necessary stability and force transmission. Because it will be done. The rollers have the same diameter and the sections forming the circulating drive mechanism have complementary lengths. It is advantageous if it is changeable. Thereby the desired positioning of the rotating mechanism is achieved be done.

The ideal arrangement and operation is that the sections of the drive mechanism circulating around the rollers are parallel. This is achieved by having a belt section. Thereby, it is further possible to drive The desired geometry between the mechanisms is obtained.

In particular, the roller has a support element which can be formed by two plates joined together at the ends. It is well supported.

In other words, it has a structure similar to a pulley.

The support element is preferably a piston-cylinder unit, a threaded spindle, an It has an operating mechanism such as an actuator or similar device.

This drive device has a drive motor mounted on a common shaft of the guide rollers of both traction transmissions. This makes it even more desirable.

In this case, the winding angle of all drivable drive mechanisms belonging to the drive unit, in particular The winding angle of the guide roller of the drive motor has at least 180°.

A reliable force transmission is thereby achieved.

For this same reason, for planetary drives motor-driven guide rollers and eccentric Guide rollers are displaced inwardly between the heart transmissions. Thereby, the motor The winding angle of the guide roller is approximately 180°. Shape compensation is provided in the gap for transmitting the driving force. Complete concatenation is important, and in this case as well, especially to increase accuracy, A large winding angle should be selected.

The eccentric drive is constructed by simple means and virtually maintenance-free. Drive In order to accommodate a movable hollow shaft in an eccentric rotating bearing, and a table In order to allow the eccentric shaft connected to the rotary bearing to pass through the rotating bearing, resource is required.

Not only eccentric shafts, but also shafts that are inserted into bearings installed on the table at the end of the table. A receiving pin can be provided. But instead, the eccentric axis is closer to the table The end may have a hole eccentrically offset relative to its axis of rotation. stomach. This hole serves as a bearing for a protruding pin connected to the table. That's it Thus, the hollow space for the lubricant can be formed in any desired manner.

The neck-shaped one side of the hollow shaft that protrudes from the bearing case is the toothed bell of the traction transmission. Suitable for forming as a wheel or sprocket. In this case, this transmission In addition to the means, the bearing of the toothed belt wheel of other traction transmission devices can be formed into a hollow shaft. .

This structure allows the designer to design the structure of the traction transmission for the adjustment drive of the eccentric transmission. Make available. Thereby, in the hollow shaft or eccentric shaft, the planetary motion changes An adjustment drive can be provided for this purpose.

To drive an eccentric shaft supported on a hollow shaft, a toothed belt wheel can be rotated on the hollow shaft. and is connected to the eccentric shaft via a driver. At the end of this entrainer itself, It has a radially projecting shoulder. This shoulder also serves as the axial dimension of the hollow shaft. Acts as a member. The eccentricity or magnitude of the planetary motion is determined by the eccentricity set in the eccentric transmission. control or changeable by a device coupled to an eccentric or eccentric transmission. be.

The device can be controlled manually or programmed, so it can be used in various forms of exercise. It is impossible to change the eccentricity within 0 hours which can be transmitted to the tool or workpiece. This is important when creating various shapes. Similarly, the control program for non-circular motion Transmitter harmonization can be done.

Hereinafter, the present invention will be described in detail based on the embodiments shown in the figures.

FIG. 1 is a sectional view taken along the line T-■ in FIG. 3 of an embodiment according to the present invention; Figure 2 is a sectional view taken along the line ■-■ in Figure 1, and Figure 3 is a cross-sectional view taken along the line m-■ in Figure 1. 4 is a schematic diagram of another embodiment of the object of the present invention, and FIG. 5 is a schematic diagram of another embodiment of the object of the present invention. It is a joint sectional view of the eccentric transmission device of shaping.

1 to 3, a table of a machine tool or grinding machine (not shown) is shown. 2, or any other machine table 2 that can be used in the process engineering field. A drive 1 for movement is schematically shown. Here, we will especially focus on profile grinding machines. As an example, a known forming method by cutting will be described. Figures 1 to 3 shows the structure and function of the drive device 1 of the profiling grinding machine for producing compacts. There is.

The table 2 or tool support of this machine is a form-complementary traction transmission! 11. 12.

These traction transmissions 3.4 each have an endless drive mechanism 5.6 and a complementary A guide roller 7.8 is drivingly connected to the guide roller 7.8. As the drive mechanisms 5 and 6 , a toothed belt passes through them, and their rotation directions are the same. This traction transmission 3.4 drives an eccentric transmission 3.4 connected to the table 2.

This eccentric transmission has no axis of rotation (not shown in Figures 1 to 4). an eccentric hollow shaft formed by (both shafts are not shown in FIGS. 1 to 4). Eccentric transmission 3. 4 will be explained in detail based on FIG. Traction (drive 3.4 is circular or circular Parallel to the planetary motion, the guide rows 77, 8, 9 and the eccentric transmission 3.4 The two station moving shafts - the hollow shaft 2 are rotated by the drive mechanisms 5 and 6, respectively. 6 or eccentric shaft 28-. Adjust eccentric transmission 3.4 In order to adjust the adjustment, an adjustment device 10 is provided for varying the amount of adjustment of the eccentric transmission 3.4. There is.

The further drive 1 shown in FIG. 4 has two eccentric transmissions 3.4 and a common axis. or a guide roller 7.8 mounted on the shaft. In Figures 1 to 4 The guide roller 7.8 together with the eccentric transmission 3.4 drives the traction transmission 3.4. It forms a section 13.14 of the moving mechanism 5.6. In this case, each traction transmission Devices 11.12 correspond to this critical section 13°14 and adjust eccentric transmissions 3, 4. The adjustment of the eccentric transmission 3.4 serves to adjust the length of this section 13.14. done by change. The lengths vary complementary to each other. That is, the interval If one section 13.14 is lengthened, the other section 14.13 is shortened by the same amount.

The other drive shown in FIG. 4 is equipped with guide rollers 7. This guide roller is on one side. It can be driven only in the direction (rotation direction). The drive mechanism 6 of the adjustable eccentric drive is It is arranged to be flexible and pretensioned.

That is, the following section 13 is provided to change the eccentricity, and the section 14 is provided to change the eccentricity. It is equipped with a facing roller 15 for removing slack. Change the length of section 13 A pneumatic, hydraulic or mechanical operating mechanism 16 is incorporated in order to . This operating mechanism changes the length of section 13 via tension roller 17, and Change the location and orientation of the interval.

Different embodiments are shown in FIGS. 1-3. The guide rollers 7.8 are eccentric It is arranged in a parallel plane offset laterally with respect to the transmissions 3, 4.

between the eccentric transmission 3.4 and the guide roller 7 (and likewise 8) arranged at a distance. is provided with a pair of rollers 18 that are slidable parallel to the plane. Section 13. 14 wraps around the rollers 19 and 20 while changing the direction of the drive mechanism 6. being guided through the la. As a result, sections 13 and 14 are when the roller pair 18 is sliding. changes its length, thereby imparting an additional rotational motion to the hollow or eccentric shaft . Since the rollers 19.20 have the same diameter, the sections 13.14 have different Length changes can be avoided. The rollers 19 and 20 have a constant distance from each other, It is supported on a support element 21. Arrangement of driven mechanism! ! The shape and shape of Section 2 in which the sections 13, 14 of the drive mechanism 6 circulating around the rollers 19, 20 are parallel 4. The support element 21 is formed in the form of a sandwich. The plates are connected to each other by webs on one side. The support element 21 is at its end is connected to an operating mechanism 16 formed by a piston-cylinder unit. ing. The operating mechanism includes a measuring scale plate 22. Based on this scale plate, Eccentricity can be adjusted or read. The measuring scale plate may be equipped with a vernier. stomach. In FIG. 3, the circle indicated by a dashed line indicates that the roller pair 18 is slidable. It shows. As already mentioned, the guide rollers 7.8 are driven by an electric or hydraulic drive motor. It can be connected to the controller 23.

The above formation allows for a rational construction.

The arrangement structure of the eccentric transmissions 3, 4 and the guide rollers 7.8, 19°20 allows for adjustment. Since the winding angle of the traction transmission device 11 of the adjustment device 10 is approximately 180'', the drive Optimal coupling with structure 5.6 is achievable.

Correspondingly, the traction transmission 12 for a purely eccentric drive is - Equipped with 9.

This roller is located between the motor guide roller 8 and the eccentric transmission 3.4 in the drive bag. It is provided in the arrangement part of the drive mechanism of W1. Therefore, the motor driven guide The winding angle on roller 8 and eccentric transmission 3.4 is likewise approximately 180°. to The drive principle simplifies the construction of the eccentric transmissions 3, 4. Eccentric transmission is a mechanical It can be mounted on a stand, and is equipped with a hollow shaft 26 that supports an eccentrically arranged rotation support part 27. It is growing. An eccentric shaft 2 that drives a drivable table 2 through this rotary bearing. 8 is being guided.

The end of the eccentric shaft 28 near the table 2 is eccentrically shifted with respect to the rotation axis 29. It has a table drive axis 30. This eccentric shaft is formed as a cylindrical hole 31. , is rotatably supported on a drive pin 32 fixedly connected to the table 2. axis of table 2 Since the bearing is carried out via the rolling bearing 33, the bearing hole 31 can accommodate lubricant. Make it. The hollow shaft 26 itself is equipped with a toothed belt pulley 34 or other form-complementary transmission of the driving force. For bearing the toothed belt pulley 35 connected to the eccentric shaft 28. To this end, the end of the eccentric shaft 2 facing the table 2 is equipped with a toothed belt. A toothed belt wheel 35 is surface-connected to the wheel 34 and has a bearing formed thereon, and is supported at this point. is equipped with a driving body 36. This driver is fixed to the shoulder 37 of the eccentric shaft 28. Ru. The retracted area of the shoulder 37 corresponds to the axial definition between the hollow shaft 26 and the eccentric shaft 28. and be helpful.

The drive 1 is controlled manually via a regulating device 10, for example by means of a regulating spindle. pneumatically or by a piston-cylinder unit. is carried out hydraulically or via an actuator or spindle drive Done electrically or electromechanically. Motor can be controlled via program It is Noh. Drive force transmission means, traction transmission devices 11, 12, drive mechanism 5.6 or In conjunction with the toothed belt pulley 34, 35, a measuring and comparing device 38 provides a control circuit. control device 10 with a signal or change the eccentricity/planetary motion It is.

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Claims (1)

[Claims] 1. At least one table driveable by a form-complementary traction transmission An eccentric transmission connected to an eccentric transmission, which eccentrically passes through a hollow shaft. Especially when producing molded parts by grinding, which are formed by shafts, For generating planetary motion for a table supported on the machine stand of a grinding machine. In the drive, parallel to the planetary motion of the table (2), at the same speed and in the same direction. Two rotating drive mechanisms (5, 6) or traction transmissions (11, 12) are provided. and this drive mechanism or traction transmission is connected to the eccentric transmission (3, 4), respectively. A driving mechanism or a traction transmission device is drivingly connected to one of the two driving shafts (26, 28). (11, 12) is equipped with an adjustment device that can change the amount of adjustment of the eccentric transmission (3, 4). A drive for generating planetary motion, characterized in that a position (10) is attached. motion device. 2. Claimed consisting of at least two eccentric transmissions drivingly connected to the table. In the drive device according to scope 1, each of the traction transmission devices (11, 12) has a small At least one guide roller (7, 8) is provided, to which a drive mechanism ( 5, 6) are partially wound and the guide rollers together with the eccentric transmission (3, 4) For forming the sections (13, 14) of the drive mechanism and adjusting the eccentric transmission (3, 4) In order to ) or to add additional support to the hollow shaft (26) via the eccentric shaft (28) A regulating device (10) is provided which produces a rotational movement in the eccentric transmission (3, 4). A drive device characterized by: 3. At least one guide roller (7) is provided, which guide roller The guide roller (7) and the eccentric transmission (3, 4) are configured to be able to be driven only in the direction of rotation. The sections (13, 14) of the drive mechanism (6) are formed between the ), the section (13) following the guide roller (7) has an operation mechanism whose length can be changed. (16) The drive device according to claim 2, characterized in that the drive device is connected to (16). . 4. The preceding section (14) is provided with a contacting opposing tension roller (15). The drive device according to claim 2, characterized in that: 5. The roller (17) that contacts the drive mechanism (6) is connected to the operating mechanism. The drive device according to claim 3, characterized in that: 6. In a plane parallel to the eccentric transmission (3, 4), the drive mechanism (5 , 6) are provided to guide the eccentric transmission (3, 4) and the eccentric transmission (3, 4). Between the guide rollers (7) is a pair of rollers (18) slidable at least approximately in parallel. A section ( 13, 14) are guided, whereby one eccentric transmission (3, 4) is guided in each case. ) and the guide roller (7) between the sections (13, 14) of the drive mechanism (6) Claim 1 or 2, characterized in that the length can be changed. The drive device described in Section 1. 7. The rollers (19, 20) have the same diameter and the drive mechanism of the traction transmission (11) The section (13, 14) formed in (6) can be changed in a complementary manner. The drive device according to claim 6. 8. The sections (13, 1) of the drive mechanism (6) circulate around the rollers (19, 20). Claim 6, characterized in that 4) has parallel belt sections (24). 8. The drive device according to item 7. 9. characterized in that the rollers (19, 20) are supported on the carrier element (21). The drive device according to any one of claims 6 to 8. 10. A support element (21) with rollers (19, 20) is connected to the operating mechanism (16) Claims 6 to 9 characterized in that the device is drivingly connected to the A drive device according to any one of the above. 11. A drive motor (23) is provided on the common axis of the guide rollers (7, 8). As described in any one of claims 1 to 10, characterized in that drive unit. 12. The winding angle of the drive mechanism (5, 6) around the guide rollers (7, 8) is small. 12. Drive device according to claim 11, characterized in that the angle is at least approximately 180°. . 13. Motor-driven guide roller (8) and eccentric transmission provided for planetary drive The section (25) of the drive mechanism (5) formed between the positions (3, 4) is shifted inward. the motor-driven guide roller (9). 8), wherein the wrap angle is at least about 180°. The drive device according to any one of Items 1 and 2 and Items 6 to 10 Place. 14. A hollow shaft (26) rotatably supported on the machine table is mounted on an eccentric rotating bearing (26). 7), an eccentric shaft (28) supporting the table (2) is guided through a rotating bearing. Any one of claims 1 to 13, characterized in that The drive device described in . 15. The eccentric shaft (28) supports a drive pin (32) connected to the table (2). Claims characterized in that they are provided with an eccentrically arranged hole (31) for 15. The drive device according to item 14. 16. The hollow shaft (26) serves as a toothed belt wheel (34) and as a driveable toothed belt. A requestor characterized in that it is formed as a shaft for supporting a rut wheel (35). The driving device according to claim 14. 17. A toothed belt wheel (35) supported by a hollow shaft (26) is fixed to an eccentric shaft (28). Claims 14 to 16 are characterized in that they are fixedly connected. A drive device according to any one of the above. 18. The eccentric shaft (28) is provided with a radially projecting shoulder (37) at one end; The shoulder is formed as a driver (36) and is drivingly connected to a toothed belt pulley (35). 18. The drive device according to claim 17, characterized in that: 19. Claim 1, characterized in that the drive device is designed to be controllable. 19. The drive device according to any one of Items 1 to 18. 20. A control device is installed between the traction transmission (11, 12) or the drive mechanism (5, 6). Claim 1 characterized in that a measuring and adjusting device is provided which is connected to the The drive device according to any one of Items 1 to 19.