Portable power tool

Abstract: A portable power tool for operating a wheel type working element comprises an output spindle (12) which is drivingly connected to a rotation motor (11) and which is provided with an automatic ball type balancing device (21) and a working implement mounting means (22), wherein the balancing device (21) comprises a peripheral wall (38) provided with a ball race (43), a transverse end wall (39) and a number of balls (41) freely movable along the ball race (43), and the peripheral wall (38) and the end wall (39) are formed in one piece with each other as well as with the output spindle (12).

Description: This invention relates to a portable power tool as per the preamble of claim 1. An example of such power tool is disclosed by DE 41 05 340 A. In particular, the invention concerns a power tool of the above type provided with a ball-type balancing device interconnected with the output spindle for automatic balancing of the output spindle and the working implement attached thereto. One problem inherent in this type of tools is the difficulty to obtain a rigid connection and a perfect centering of the balancing device in relation to the output spindle. Another problem is to accomplish a compact power tool design where the overall axial dimension of the output spindle and the balancing device is small and where the axial distance between the working implement and the forward bearing of the output spindle is small. The primary object of the invention is to create a power tool of the above type in which the identified problems are avoided. This is accomplished by the invention as it is defined in claim 1. A preferred embodiment of the invention is described below with reference to the accompanying drawing figures. On the drawings: Fig. 1 shows a longitudinal section through the output end of an angle grinder. Fig. 2 shows a side elevation, partly in section, of a clamping element and a working implement clamping screw. Fig.3 shows a fractional section of the balancing device. Fig.4 shows a cross section along line III - III in Fig. 1. Fig.5 shows, on a larger scale, a fractional section through the rear bearing and retaining means of the output spindle. Fig.6 shows, on a larger scale, a side elevation of the coupling element. The power tool shown in the drawing figures is an angle grinder which comprises a housing 10, a rotation motor 11 and an output spindle 12. The latter is drivingly coupled to the motor 11 by means of an angle drive 13 which comprises a pinion 14 connected to the motor 11 and a bevel gear 15 connected to the output spindle 12. The output spindle 12 is journalled relative to the housing 10 by a forward ball bearing 17 and a rear ball bearing 18. The outer race of the forward bearing 17 is supported in a detachable wall section 19 of the housing 10. At its forward end, the output spindle 12 is provided with an automatic ball type balancing device 21 and a mounting means 22 for a wheel type of grinding tool (not shown). The grinding tool mounting means 22 comprises a threaded coaxial bore 23 in the output spindle 12 for receiving a clamping screw 24, a radial support shoulder 25, a threaded socket portion 26 coaxial with the bore 23, and a disc shaped grinding tool support element 28. The latter is formed with a rear threaded neck portion 29 for engagement with the socket portion 26. The pitch of this thread, however, is bigger than the pitch of the thread of the clamping screw 24, which means that the clamping screw 24 and the support element 28 can not be untightened in unison. The support element 28 also comprises a forwardly directed tubular neck portion 27 for centering cooperation with a corresponding central opening in the grinding tool. Moreover, the support element 28 has a coaxial opening 30 which is provided with axially directed splines 31. A clamping element 32 is arranged to cooperate with the clamping screw 24 to clamp the grinding tool against the support element 28. The clamping element 32 has a tubular neck portion 33 provided with splines 35 for cooperation with the splines 31 in the opening 30 of the support element 28. See Fig. 4. Due to the locking action of the spline connection between the support element 28 and the clamping element 32 on one hand and due to the difference in pitch between the threads on the clamping screw 24 and the support element 28 on the other hand the grinding tool is prevented from comming loose as a result of any accidental relative rotation between the grinding tool and the output spindle 12. The support element 28 is formed with a flat radial flange 36 which is intended to be sandwiched between the support shoulder 25 on the output spindle 12 and the grinding tool. The support shoulder 25 forms together with the support element 28 an axial backing means for the grinding tool as the latter is secured by tightening of the clamping screw 24. When after some service time the support element 28 has become worn down to a certain extent it is easily exchanged by a new one. Without the employment of a separate support element 28, the shoulder 25 on the output spindle 12 itself would be subjected to the inevitable mechanical wear caused by the grinding tool. An exchange of the entire output spindle 12 would be a much more costly operation. The separate support element 28 also makes it possible to accomplish a simple adaptation of the mounting means 22 to differently shaped grinding tools. The balancing device 21, which is intended to compensate for dynamic unbalance forces arrising in the grinding tool during its service life, comprises a circular peripheral wall 38, a transverse end wall 39, an annular closure member 40, and a number of steel balls 41 freely movable along the peripheral wall 38. For accurate guidance of the balls 41, the peripheral wall 38 is provided with an internal part-spherical contact surface 43 of a very high quality as regards centering visavi the rotation axis of the output spindle 12 and smoothness. This type of balancing device is previously known per se and is described in for instance GB 832 048. In the power tool, however, the transverse end wall 39 and the peripheral wall 38 are formed integrally with each other as well as with the output spindle 12, and the transverse end wall 39 forms the radial support shoulder 25 of the grinding tool mounting means 22. Also formed in one piece with the output spindle 12 is a coaxial cylindrical surface 42 located radially inside the balls 41 and having a smaller axial extent than the peripheral wall 38. The annular closure member 40 has a substantially L-shaped cross sectional profile and is clamped by elastic expansion between the peripheral wall 38 and the cylindrical surface 42. For securing the closure member 40 in this position, the rear portion of the peripheral wall 38 is formed with an internal shoulder 44 for cooperation with the outer rim portion of the closure member 40, thereby locking the closure member 40 against rearward axial movement. See Fig. 3. O-rings 45, 46 are fitted in grooves 47, 48 in the peripheral wall 38 and the inner cylindrical surface 42, repectively, for sealing cooperation with the closure member 40. Close to the end wall 39, the output spindle 12 is formed with a radial shoulder 49 and a cylindrical surface 50 for locating the inner ball race of the forward bearing 17. Since the diameter of the cylindrical surface 42 is bigger than the outer diameter of the bearing 17, it is possible to have the closure member 40 located partly outside the bearing 17. This means in turn that the forward end section of the output spindle 12, the balancing device 21 included, is axially very compact. Further to the rear, the output spindle 12 comprises another radial shoulder 52, a cylindrical surface 53 for guidingly supporting the bevel gear 15, a spline portion 54, a further cylindrical surface 55 and a threaded portion 56. The rearmost cylindrical surface 55 supports guidingly the inner race of the rear bearing 18 and the threaded portion 56 is engaged by a clamping nut 58. On the spline portion 54, there is supported an annular coupling element 59 which is formed with internal splines for driving connection with the spline portion 54 and with forwardly extending coupling teeth 60. See Fig. 6. The latters engage mating dog means 61 on the bevel gear 15 for transferring a driving torque between the bevel gear 15 and the coupling element 59. The inner ball race of the rear bearing 18, the coupling element 59 and the bevel gear 15 are axially clamped to a rigid unit between the clamping nut 58 and the shoulder 52. By this arrangement it is made possible to use a light fit between the bevel gear 15 and the output spindle 12, which fascilitates dismantling of the output spindle assembly. The bevel gear 15 is formed with a forwardly extending neck portion 62 on which is mounted a sleeve element 63 for cooperation with a seal ring 64 mounted in the housing 10. The purpose of the seal ring 64 is to prevent escape of the lubricating grease originally applied to the angle drive 13. The output spindle 12 together with the rear bearing 18, the coupling element 59, the bevel gear 15 and the forward bearing 17 are axially clamped to the housing 10 by means of a retainer element 65 located beneath the rear bearing 18 and secured to the housing 10 by means of two screws 66. See Fig. 4. A clamping force is applied on the outer race of the rear bearing 18 by means of a washer type spring 67 inserted between the bearing 18 and the retainer element 65. See Fig. 5. The axial clamping force exerted by the spring 67 is transferred to the output spindle 12 via the rear bearing 18 and further to the housing 10 via the output spindle 12, the forward bearing 17 and the wall section 19. By this arrangement there is obtained an axial pretensioning of the ball bearings 17, 18 such that the bearing plays are eliminated and the rotation accuracy of the output spindle 12 is very high.

Claims: Portable power tool for operating a rotating working implement, comprising a housing (10), a rotation motor (11), an output spindle (12) journalled in said housing (10) and intended to carry a working implement, an angle drive (13) including a bevel gear (15) mounted on said output spindle (12) for connecting said output spindle (12) to said motor (11), said output spindle (12) is formed with a first cylindrical surface (50) for supporting a forward bearing (17), a second cylindrical surface (55) axially spaced from said first cylindrical surface (50) and intended to support a rear bearing (18), a third cylindrical surface (53) located between said first and second cylindrical surfaces (50,55) and intended to support said bevel gear (15), characterized by a ball-type balancing device (21) rigidly connected at the forward end of said output spindle (12) and comprising a peripheral wall (38) with a ball race (43), a number of balls (41) freely and individually movable along said ball race (43), and a transverse end wall (39), and in that said output spindle (12) is formed as a one piece element including said first, second and third cylindrical surfaces (50,55,53), said peripheral wall (38) including said ball race (43), and said transverse end wall (39) of said balancing device (21), wherein said transverse end wall (39) forms an axially facing support shoulder (25) for a working implement attached to said output spindle (12). Power tool according to claim 1, wherein said output spindle (12) comprises a co-axial radially outwardly facing cylindrical surface (42) located radially inside said balls (41), an annular closure member (40) is mounted between said peripheral wall (38) and said cylindrical surface (42) so as to enclose said balls (41) between said peripheral wall (38) and said cylindrical surface (42). Power tool according to claim 2, wherein said cylindrical surface (42) has a diameter exceeding the outer diameter of said forward bearing (17).

Inventors: JACOBSSON ROLF ALEXIS, JACOBSSON, ROLF ALEXIS
Applicants: ATLAS COPCO TOOLS AB
Application year: 1997
Main classification: B24B41
IPC codes: B24B45, B25F5, B24B23, B24B41