Grinding arm for grinding of workpieces with an inner profile with a grinding wheel

Abstract

A grinding arm for grinding workpieces with an inner profile with a grinding wheel. The grinding arm has a tube-shaped base body with a longitudinal axis, in which the grinding wheel is supported at one axial end region. A first drive for the grinding wheel is arranged in its other axial end region. A first transmission system transmits the rotation from the first drive to the grinding wheel. In order to adjust arbitrary angles of inclination of the grinding wheel in the grinding arm, the grinding wheel is arranged on a grinding spindle driven by the first transmission system and rotating around an axis of rotation. The grinding spindle is supported in a carrier body arranged in the base body rotatable around an axis perpendicular to the longitudinal axis as well as perpendicular to the axis of rotation, wherein the axis of rotation and the axis intersect.

Claims

1. A grinding arm for grinding of workpieces with an inner profile with a grinding wheel, wherein the grinding arm has a tube-shaped base body with a longitudinal axis and two axial end regions, the grinding wheel being supported at a first of the axial end regions and a first drive for the grinding wheel being arranged in a second of the axial end regions, wherein a transmission of rotation from the first drive to the grinding wheel takes place by way of a first transmission system, wherein the grinding wheel is arranged on a grinding spindle which is driven by the first transmission system and rotates around an axis of rotation, wherein the grinding spindle is supported in a carrier body which is arranged in the base body so as to be rotatable around an axis, which axis is perpendicular to the longitudinal axis as well as perpendicular to the axis of rotation, wherein the axis of rotation and the axis intersect.

2. The grinding arm according to claim 1, further comprising a second transmission system having a second drive, wherein the carrier body is rotatable in the base body via the second drive.

3. The grinding arm according to claim 2, wherein the second transmission system comprises a second belt, or a second chain which runs between the two axial end regions of the base body.

4. The grinding arm according to claim 3, wherein the second belt or the second chain is connected with the carrier body and can rotate the carrier body around the axis.

5. The grinding arm according to claim 4, wherein the bearing of the carrier body occurs by means of two roller bearings in one axial end region of the base body.

6. The grinding arm according to claim 1, wherein clamping means are arranged by which the carrier body can be clamped in the base body in a relative position.

7. The grinding arm according to claim 6, wherein the clamping means includes a hydraulically expandable mandrel.

8. The grinding arm according to claim 1, wherein the first transmission system comprises a first belt, or a first chain which runs between the two axial end regions of the base body.

9. The grinding arm according to claim 8, wherein the first belt or the first chain drives a first gear element, which is rotatably supported in one of the axial end regions of the base body, wherein the first gear element drives a second gear element, which is connected with the grinding spindle.

10. The grinding arm according to claim 9, wherein the second gear element is arranged on an intermediate shaft which drives the grinding spindle via a further pair of year elements.

11. The grinding arm according to claim 9, wherein the first gear element is a crown wheel, a bevel wheel or a friction wheel.

Description

BRIEF DESCRIPTION OF THE DRAWING

(1) In the drawing:

(2) FIG. 1 shows in the side view a first embodiment of the grinding arm according to the invention with a workpiece which has to be ground,

(3) FIG. 2 shows in the front view a second embodiment of the grinding arm and

(4) FIG. 3 shows a sectional view through the grinding arm according to FIG. 1 and FIG. 2 respectively in a height of the lower axial and of the grinding arm.

DETAILED DESCRIPTION OF THE INVENTION

(5) In FIG. 1 a grinding arm 1 is shown by which a workpiece 28 is ground, namely an internal helical gearing of the same, which is arranged at the inner circumference of the hollow cylindrical designs workpiece 28. The grinding arm 1 has a base body 3 which is designed substantially tube-shaped. In one of its (lower) axial end regions 4 a grinding wheel 2 is arranged in the base body 3, in the other (upper) axial end region 5 of the base body 3 a first drive 6 for driving of the grinding wheel 2 is arranged. It cannot be seen in FIG. 1 that for driving of the grinding wheel 2 a toothed belt is running in the inner of the base body 3 which transmits the driving power from the first drive 6 to the grinding wheel 2.

(6) The grinding wheel 2 must be adjusted to a helix angle which is necessary to grind the helical gearing of the workpiece 28. The pivoting of the grinding wheel 2 takes place around and axis B which is perpendicular to the longitudinal axis L of the base body 3 as well as to the axis of rotation A of the grinding wheel 2 (in FIG. 1 the axis of rotation A is perpendicular to the plane of projection).

(7) For the adjustment of the grinding wheel 2 to the desired or required pivoting angle a second drive 11 is provided which is also arranged in an (upper) axial end region 5 of the base body 3.

(8) When comparing FIGS. 1 and 2 (in FIG. 2 the grinding arm 1 is shown rotated by 90 around the longitudinal axis L) it can be seen that the drive of the grinding wheel 2 by the first drive 6 can occur in a different manner with respect to the construction in the (upper) end region 5 of the base body 3. As shown in FIG. 1 a direct arrangement of the drive 6 at the grinding arm 1 can be provided or also, as shown in FIG. 2, an indirect arrangement can be provided at which the driving power is transmitted via driving means (toothed belts, intermediate shafts) which are displaced to the outer side. Which solution is chosen depends on the situation at the grinding machine in which the grinding arm 1 is employed.

(9) The concrete specific design of the grinding arm 1 becomes apparent from the cross sectional view according to FIG. 3, wherein here a section perpendicular to the longitudinal axis L is shown, namely in the height of the grinding wheel 2, wherein the same is here adjusted to a pivoting angle of 0 for sake of clarity.

(10) In the (upper) axial end region 5 of the grinding arm 1, as already mentioned, two (not depicted) pulleys are supported which are driven by the drives 6 and 11. A first toothed belt 13 runs downwards in the inner of the grinding arm 1 to the region of the axial end region 4 of the base body 3. In FIG. 3 the first toothed belt 13 is denoted which runs around a first belt pulley 26 which is connected torque proof with a first gear element 14 in the form of a bevel wheel (the belt pulley 26 and the gear element 14 can be designed as a one-piece). The bevel wheel 14 is supported rotatable in the lower axial end region 4 of the base body 3 and meshes with the bevel gearing with a second gear element 15 in the form of a pinion. The pinion 15 is supported on an intermediate shaft 16 which is arranged rotatable in a carrier body 9 (the intermediate shaft 16 is presently designed as pin and bolt respectively on which roller bearings are arranged by which it is supported). The carrier body 9 is rotatable supported around the axis B in the lower axial end region 4 of the base body 3. Two roller bearings 20 and 21 serve for this purpose.

(11) It is essential that the axis of rotation A and the axis B intersect. Thereby beneficially a rotation of the grinding wheel 2 including the carrier body 9 around the axis B by 360 is possible.

(12) On the intermediate shaft 16 a second pair of gearing 17 and 18 is arranged (spur-gear), wherein the gearing 18 is connected torque proof with the grinding spindle 8 which bears the grinding wheel 2.

(13) If accordingly the first toothed belt 13 is driven by the first drive 6 the same rotates the bevel wheel 14 and thus via the pinion 15 the intermediate shaft 16. The intermediate shaft 16 drives in turn via the pair of gearing 17 and 18 the grinding spindle 8 and accordingly the grinding wheel 2.

(14) The first toothed belt 13, the bevel wheel 14, the pinion 15, the intermediate shaft 16 and the pair of gearing 17, 18 thus form a first transmission system 7 by which the driving power of the first drive 6 is transferred to the grinding spindle 8 and thus to the grinding wheel 2.

(15) Beside this a second transmission system 10 exists by which a rotational movement can be transferred from the second drive 11 onto the carrier body 9 in such a manner that the grinding wheel 2 is adjusted around the axis B to the desired helix angle.

(16) The second transmission system 10 comprises a second toothed belt 19 which runs around a second belt pulley 17 which in turn runs around the carrier body 9. If accordingly the second drive 11 is activated the second belt pulley 27 is rotated via the second toothed belt 19 and thus the carrier body 9 around the axis B. For doing so no stop exists so that the full circumference (360) is covered, i. e. the grinding wheel 2 can be rotated completely around the axis B.

(17) If a desired helix angle is adjusted clamping means 12 in the form of hydraulic clamping means can be actuated to clamp the carrier body 9 relatively to the bottom region of the grinding arm 1.

(18) For the clamping of the grinding wheel 2 on the grinding spindle 8 a hydraulic expanding mandrel 25 is provided.

(19) In order to supply the grinding wheel 2 at all adjusted helix angles always sufficiently with grinding oil a grinding oil supply 22 is provided which guides to a grinding oil distribution 23; from here the grinding wheel 2 is supplied with grinding oil.

(20) A measurement system 24 should still be mentioned which serves for measuring the ground toothing and ground profile respectively.

(21) In the above description the grinding tool was addressed as being a grinding wheel 2. Of course in general it is also possible that the grinding arm according to the invention is used in connection with a grinding worm.

(22) While specific embodiments of the invention have been shown and described in detail to illustrate the inventive principles, it will be understood that the invention may be embodied otherwise without departing from such principles.