Circular truncated cone bearing device

Abstract

The invention relates to a circular truncated cone bearing arrangement having a circular truncated cone bearing (10), in which a clamping device (33) acts on a shaft disk (30) such that a tangential torque acting on the circular truncated cone bearing (10) can be compensated by a tangential resistance torque. For this purpose, a pressure medium can be introduced via a channel (43) and a conveying device (39) into a chamber (37) surrounded by the ring (35), said chamber having a membrane (31) with a surface (31a). The surface (31a) of the diaphragm (31) has a high coefficient of friction and can be in contact with the radial surface (30a) of the hub (30) by reducing the pressure in the chamber (37). The diaphragm (31) can be returned to its original shape again by means of a pressure reduction or an additional component such as a return spring (41).

Description

Technical Field

[0001] The invention relates to a truncated cone bearing device, which comprises a truncated cone bearing. The truncated cone bearing has an inner ring, an outer ring and rolling bodies arranged in one or more rows, and the rolling bodies roll on the inner ring and the outer ring. Background Art

[0002] Round shafts or round tables are used in machine tools and are supported by axial-radial bearings. Such round table bearing devices are disclosed in DE 102014205097, for example.

[0003] The round table must withstand different processing forces without allowing significant relative movement. In addition to gravity, the axial-radial bearing also absorbs the overturning moment. In simultaneous processing (all axes are involved), the drive device of the round table generates a tangential moment. The tangential moment is not enough for many processes. Therefore, the round shaft is usually fixed via a clamping device after positioning. For example, DE102019106088 A1 shows such a clamping device.

[0004] The clamping device does not absorb kinetic energy, it is not a brake, but rather generates a position-reliable tangential resistance torque. To ensure this, the clamping device, the bearing and the table must be very precisely coordinated with each other. Summary of the invention

[0005] The object underlying the present invention is to provide a round table bearing arrangement which allows simple adjustment of the round table.

[0006] In order to achieve the above-mentioned purpose, a truncated cone bearing device is proposed, which includes a truncated cone bearing, wherein the truncated cone bearing has an inner ring, an outer ring, rolling elements arranged in one or more rows, and a shaft disk, and a truncated cone to be installed can be connected to the shaft disk, wherein a clamping device is provided, and the clamping device acts on the shaft disk so that the tangential torque acting on the truncated cone bearing can be compensated by a tangential resistance torque.

[0007] Until now, the adjustment of the clamping device of the round table required considerable effort, because the different manufacturing tolerances of the large components caused coordination difficulties between the table and the housing. By combining the axial-radial rolling bearing of the round table with the clamping device in a round table bearing arrangement for the first time, the adjustment process is greatly simplified, especially because the bearing surface is manufactured with high precision. The reduction in components also results in shorter installation times.

[0008] Preferably, the clamping device has a diaphragm, which generates a tangential resistance torque by friction at the shaft disk. Thus, the clamping is achieved by friction at the diaphragm. A "diaphragm" is to be understood here as a planar component with significant elastic deformability.

[0009] Further preferably, a non-movable ring is provided surrounding the shaft disk, the ring forming a chamber which is closed in a pressure-tight manner by the diaphragm, wherein the chamber has a conveying device for the pressure medium, and wherein the ring is arranged so that when the pressure medium is conveyed into the chamber, the diaphragm moves toward the shaft disk and generates a tangential resistance torque. It is not necessary to have a closed ring here, the diaphragm can also surround the shaft disk in sections. In this embodiment, the clamping can be achieved in a simple manner by conveying the pressure medium. Here, the pressure medium can be gaseous or liquid, so that the clamping can be pneumatic or hydraulic.

[0010] Preferably, the diaphragm automatically rebounds when the pressure in the pressure medium decreases. The diaphragm is thus formed by an elastic design, so that no additional restoring actuator is required.

[0011] Preferably, a return spring is provided, by which the diaphragm can be moved back into its initial position when the pressure in the pressure medium decreases. Such a return spring is particularly advantageous if the embodiment of the diaphragm requires a rigidity that does not allow automatic return.

[0012] Preferably, the diaphragm has a surface oriented toward the shaft disc, which has friction-increasing properties. By coating or otherwise applying such a surface to the diaphragm, it is possible to select a diaphragm material that ensures mechanical strength and elasticity, independently of the high friction forces that are also present in order to ensure a sufficient tangential resistance torque. The friction forces are generated via the surface material.

[0013] Further preferably, the membrane acts on the radial surface of the shaft disc.Thereby, the clamping device can be placed so that for the installation of the round table, the clamping device will not become an obstacle. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The truncated cone bearing device is described in detail below in a number of preferred embodiments with reference to the accompanying drawings. Here, it is shown:

[0015] Figure 1 A schematic diagram showing a portion of a circular table machine having a circular table bearing arrangement,

[0016] Figure 2 A round table bearing arrangement with a clamping device is shown. DETAILED DESCRIPTION

[0017] Figure 1A detail is shown from a circular table machine 1, which comprises a table support 2 with a support component 3. Furthermore, a shaft 4 is provided with a flared section for the inner ring of the circular table bearing, wherein the flared section is realized via a hollow cylindrical section 5 of the shaft 4. The shaft 4 has a table flange 6, on which the actual circular table to be rotated - not shown in detail - is accommodated.

[0018] The cylindrical bearing arrangement also includes a true cylindrical bearing 10, which has an outer ring 11 and an inner ring 12. The inner ring 12 is guided on the outer ring 11 via a total of three rolling element rows 13, 14, 15, wherein the rolling element rows 13 and 14 are used for axial support and the rolling element row 15 is used for radial support. In principle, the same physical effects also play a role in other bearing structures, such as double-row tapered roller bearings.

[0019] Figure 2 Now partially schematically shown as Figure 1 The cylindrical bearing in the embodiment of the present invention is supplemented with a clamping device 33, which is known per se. The clamping device comprises a ring 35 which surrounds the shaft disc 30, according to Figure 1 The flange of the platform is placed on the shaft disc. A chamber 37 is formed in the ring 35, which is implemented in a pressure-tight manner. The side of the chamber 37 oriented toward the shaft disc 30 is implemented as a diaphragm 31, that is, the chamber wall is implemented thinly in a surface-shaped manner, so that the chamber wall has sufficient elasticity so that it can contact the shaft disc 30 on the radial surface 30a. For this purpose, the pressure medium can be introduced into the chamber 37 under pressure via the conveying device 39, so that the generated overpressure causes the diaphragm 31 to bulge outward, so that the diaphragm reaches the radial surface 30a. The pressure medium is guided to the conveying device 39 via the channel 43 shown schematically. The pressure can be set via a measuring and control unit not shown in detail so that the desired clamping force on the shaft disc 30 is generated, thereby constructing a sufficient tangential resistance torque.

[0020] The diaphragm 31 can be designed so that when the pressure in the pressure medium decreases, it automatically returns to its initial position due to its own elasticity, in which it releases the shaft disk 30 again. In the example shown here, a return spring 41 is provided, which causes or supports the return. The diaphragm 31 also has a surface 31a oriented toward the shaft disk 30, which has a high coefficient of friction. As a result, the diaphragm 31 can be formed from a base material suitable for strength and elasticity, regardless of the coefficient of friction.

[0021] Reference numerals list

[0022] 1 Round table machine

[0023] 3 Support components

[0024] 4 Axis

[0025] 5 sections

[0026] 6 flanges

[0027] 10 Round table bearing

[0028] 11 Outer Ring

[0029] 12 Inner Ring

[0030] 13 rolling element rows

[0031] 14 rolling element rows

[0032] 15 rolling element rows

[0033] 30 Axis Disc

[0034] 30a Radial surface

[0035] 31 Diaphragm

[0036] 31a Surface

[0037] 33 Clamping equipment

[0038] 35 rings

[0039] 37 Chamber

[0040] 39 Conveying device

[0041] 41 Return spring

[0042] 43 channels

Claims

1. A truncated cone bearing device, comprising a truncated cone bearing (10), wherein the truncated cone bearing has an inner ring (12), an outer ring (11), rolling elements (13, 14, 15) arranged in one or more rows, and a shaft disk (30), wherein a truncated cone to be installed can be connected to the shaft disk, and wherein: A clamping device (33) is provided, which acts on the shaft disk (30) so that the tangential moment acting on the circular table bearing can be compensated by a tangential resistance moment.

2. The truncated cone bearing device according to claim 1, characterized in that: The clamping device (33) has a diaphragm (31) which generates the tangential resistance torque by friction on the shaft disk (30).

3. The truncated cone bearing device according to claim 2, characterized in that: A non-movable ring (35) is provided surrounding the shaft disk (30), the ring forming a chamber (37) which is closed pressure-tightly by the diaphragm (31), wherein the chamber (37) has a delivery device (39) for a pressure medium, and wherein the ring (35) is arranged so that when the pressure medium is delivered into the chamber (37), the diaphragm (31) moves toward the shaft disk (30) and thereby generates the tangential resistance torque.

4. The truncated cone bearing device according to claim 3, characterized in that: The pressure medium is gaseous.

5. The truncated cone bearing device according to claim 3, characterized in that: The pressure medium is liquid.

6. The truncated cone bearing device according to any one of claims 3 to 5, characterized in that: The diaphragm (31) automatically rebounds when the pressure in the pressure medium decreases.

7. The truncated cone bearing device according to any one of claims 3 to 5, characterized in that: A return spring (41) is provided, by which the diaphragm (31) can be moved back into its initial position when the pressure in the pressure medium decreases.

8. The truncated cone bearing device according to any one of claims 2 to 7, characterized in that: The diaphragm (31) has a surface (31a) oriented toward the shaft disk (30) and having friction-increasing properties.

9. The truncated cone bearing device according to any one of claims 2 to 8, characterized in that: The diaphragm (31) acts on a radial surface (30a) of the shaft disk (30).

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