BRIEF DESCRIPTION OF THE DRAWINGS
The present invention is described in more detail in the following detailed disclosure of a preferred, but nonetheless illustrative embodiment with reference to the attached figures, wherein:
FIG. 1 is a perspective view of a reversing area of an escalator or moving walk with the drive according to the invention;
FIG. 2 is a view presenting details of the drive;
FIG. 3 is a cross-section view taken along line A-A of FIG. 2;
FIG. 4 is a view of a reversing area of an escalator or moving walk with two identical drives;
FIG. 5 is a cross-section view taken along the line B-B of FIG. 4; and
FIGS. 6, 7, and 8 present further alternative embodiments of the drive of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a reversing area 1 of an escalator or moving walk with a drive 2 according to the invention. Not shown are the step band or pallet band whose step chain rollers or pallet chain rollers and step running rollers or pallet running rollers are guided by means of guiderails 3. The guiderails 3 are borne by a truss or by side plates 4. Also not shown is the balustrade base, the balustrade, and the handrail of the escalator or moving walk. On each side, the chain of the step band or pallet band enters into positive engagement with a first or left and second or right chain wheel 5, 5.1, whereby the step band or pallet band is moved or transported by means of the two chain wheels 5, 5.1.
The chain wheels 5, 5.1 are driven by means of the drive 2. The drive 2 consists essentially of a motor 6, a first axial gear 7, a first hollow shaft 8 and a second hollow shaft 14. The axial drive gear can be, for example, a planetary gear, a Cyclo gear, an ellipsoidal gear, or a harmonic drive gear. These gears are characterized by high transmission ratios. Instead of the step chains or pallet chains and chain wheels 5, 5.1, belts or belt-like bands and belt wheels can be provided.
FIG. 2 shows details of the drive 2. By means of a first pulley 9 or belt, groove, band, or rope sheave, the motor 6 drives a belt 10 (or poly V belt, band, or rope) that in turn drives a second pulley 12 that is arranged on a gear input shaft 11. Arranged at one end of the rapidly rotating gear input shaft 11 is an operating brake 13; the other end of the gear input shaft 11 is connected to the first axial gear 7. The gear input shaft 11 runs coaxial to the first hollow shaft 8. A first flange 15 supports the first chain wheel 5 on the truss or side plate 4. Arranged at one end of the second hollow shaft 14 is the second chain wheel 5.1. The other end of the second hollow shaft 14 is connected to the rotating housing 7.1 of the first axial gear 7. A second flange 16 that is connected to a supporting plate 34 serves as a torque converter bearing for the first axial gear 7.
Also arranged on the hollow shafts 8, 14 can be, for example, at least one further driving wheel, for example a chain wheel, that by means of a traction means, for example, a chain, drives the handrail in synchrony with the chain wheels 5, 5.1 of the step band or pallet band.
FIG. 3 shows a cross section along the line A-A of FIG. 2. Brake 13 and second pulley 12 are connected to the rapidly rotating gear input shaft 11. Not shown is the torque converter bearing of the brake 13. Between the first flange 15 and a first bushing 17 is a first bearing 18. First chain wheel 5 and first hollow shaft 8 are connected to the first bushing 17 and thereby rotatably relative to the first flange 15. At its other end, the first hollow shaft 8 is connected to the slowly rotating housing 7.1 of the first axial gear 7. Provided between the gear input shaft 11 and the first bushing 17 is a second bearing 19. The gear input shaft 11 is borne in the housing 7.1 on a third bearing 20 and on a fourth bearing 21, the fourth bearing 21 being arranged between the rapidly rotating gear input shaft 11 and a gear output shaft 22. Provided between the second hollow shaft 14 and the gear output shaft 22 are a fifth bearing 23 and a sixth bearing 24, the second hollow shaft 14 being rotatable relative to the gear output shaft 22 and being connected at one end to the slowly rotating housing 7.1 and at the other end to the second chain wheel 5.1. By means of a second flange 16 that serves as a torque converter bearing, the gear output shaft 22 is connected tightly to the side plate 4 or truss 4.
FIG. 4 shows a reversing area 1 of an escalator or moving walk respectively with two identical mirror-inverted drives 2, 2.1. Two drives 2, 2.1 are used particularly for large travel heights. Provided for each chain wheel 5, 5.1 is a motor 6, 6.1, traction means 10, 10.1, an axial gear 7, 25, and a brake 13, 13.1, the motors 6, 6.1 being mechanically coupled or joined by means of the axial gear 7, 25.
FIG. 5 shows a cross section along line B-B of FIG. 4. The drive 2.1 is arranged mirror-inverted relative to drive 2. Except for the torque converter bearing for the locationally fixed gear output shafts 22, 26, the drives 2, 2.1 are comparable to the drive 2 of the single-motor variant of FIGS. 1 to 3. No torque converter bearing is required in the two-motor variant. The gear output shafts 22, 26 rest against and brace each other, whereby the rotational motion is transferred to the housing 7.1, 25.1 of the axial gears 7, 25. With the mirror-inverted arrangement, the direction of rotation of one motor and axial gear is opposite to the direction of rotation of the other motor and axial gear. Also mutually opposite are the torques on the gear output shafts 22, 26. As shown in FIG. 5, the two gear output shafts 22, 26 are mechanically coupled or connected, as a result of which no torque converter bearings are required. For the drive 2.1, the following further reference numbers are introduced: first hollow shaft 8.1, gear input shaft 11.1, housing 25.1, first pulley 9.1, second pulley 12.1, and second brake 13.1.
FIG. 6 shows a drive 2 without second hollow shaft 14. The housing 7.1 takes on the function of the hollow shaft 14 and directly and with positive engagement adjoins the second chain wheel 5.1. An additional component can thereby be eliminated. This variant embodiment makes possible a fixing on one side and a variable embodiment or changeable length or escalator width that can be accommodated by means of the first hollow shaft 8. Furthermore, the axial gear 7 is thereby locationally determined and can transfer the rotations of the housing 7.1 to the second chain wheel 5.1 without difficulties.
FIG. 7 shows a variant embodiment with two drives 2, 2.1 without the hollow shafts 8, 8.1. The housings 7.1 and 25.1 directly adjoin the chain wheels 5 and 5.1 and are positively engaged with the chain wheels 5 and 5.1 and transfer rotational motion. The housings 7.1, 25.1 take on the function of the hollow shafts 8, 8.1. The two axial gears 7 and 25 produce the required escalator or moving walk width and facilitate assembly through there being fewer individual parts and connecting parts. The axial gear 7 rests directly on the axial gear 25. The two housings 7.1 and 25.1 rest against each other and rotate in synchrony. The two gear output shafts 22 and 26 are still mechanically coupled. The torque converter bearing function is still defined, the two gear output shafts 22 and 26 remaining stationary.
FIG. 8 shows a drive without hollow shafts 8, 14. The housing 7.1 takes on the function of the hollow shafts 8, 14 and drives both chain wheels 5 and 5.1 directly, gear 7 and housing 7.1 occupying the complete width. The hollow shaft gear that is thereby formed is compact, simple to assemble, light in weight, easy to manipulate, space saving, and inexpensive to manufacture.
Patent Application
20080067034
