CZ304162B6 - Clearance-free worm and wheel gear with disk-type wheel - Google Patents

Abstract

The clearance-free worm and wheel gear with disk-type wheel (1) of the present invention consists of a wheel (1) fixed half (11) and free half (16), which halves (11, 16) contact in the disk wheel (1) central plane (17) and which are provided with a common identical spiral teeth (9) for engaging worm (2), wherein the axis (5) of the worm (2) is deflected by an angle ({alpha}) from a vertical plane (17) passed through the axis (4) of the disk wheel (1) tooth (9) width (1) perpendicularly to the wheel axis (6) of rotation. Free clearance is achieved by rotating the free half (16) in the counter-direction of the rotation of the fixed half (11) and its fixing by position-adjusting screws (13).

Description

Technical field

The invention relates to a new way of arranging the worm gearing with a cylindrical worm, which allows a more robust engagement in the gearing with the definition of the lateral clearances.

BACKGROUND OF THE INVENTION

So far, worm gears with 90 ° cross-wheel and worm axes have been used. The duration of simultaneous engagement between the teeth of the wheel and the worm is from 1.3 to 1.6, depending on the size of the gear ratio, which is particularly important for the low load-bearing capacity of the gears, the ability to transmit power during impact operation. for backlash-free transmission without limiting the transmitted power. The same applies to worm gears with a cylindrical worm whose axis is deflected from the central plane of the disc wheel.

The essence of the technical solution

Said condition of the worm gearing with the disc wheel substantially favors a new arrangement of the two-part disc wheel. These intersect in the central plane of the disc wheel and are jointly provided with the same spiral toothing corresponding to the toothing of the cylindrical worm whose axis is deflected from the center plane guided by the axis of the tooth width of the disc wheel. Their connection allows mutual rotation and fixation to achieve free-play in the gearing.

Overview of the drawings

FIG. 1 is a view of the engagement of a half-worm cylindrical worm with a spiral toothed worm wheel.

Fig. 2 is a schematic cross-section in a vertical axis plane passing through the worm wheel axis and the intersection point of the axial distance.

Fig. 3 shows the deflection of the axis of the cylindrical worm by an angle α from the center plane passing through the center of the worm gear tooth width and the intersection point of the axial distance.

Fig. 4 and Fig. 5 schematically show the distribution of the worm wheel passing through the center of the tooth width to allow the rotation of its halves and their fixation after the adjustment of the backlash-free state.

Fig. 6 schematically shows the assembly of the disc wheel with the meshing of the gear.

DETAILED DESCRIPTION OF THE INVENTION

The construction of a backlash-free worm gear with a disc wheel is schematically indicated in Fig. 1, where a view of the half of the disc wheel 1 is engaged with the cylindrical worm 2. The thread 8 of the cylindrical worm 2 and the helical gear 9 The wheel is formed in a central plane 17 passing through the tooth profile profile axis 3 (FIG. 2) and the tooth axis width axis 4 (FIG. 3). This distribution of the disc wheel 1 is also utilized practically for its arrangement for a backlash-free gearing. At the intersection of the axis 5 of the cylindrical worm 2 and the vertical plane passing through the axis 6 of the wheel rotation (Figs. 1, 2), there is a pitch 7

(Fig. 1), which determines the axial distance of the gear set α (Figs. 1, 2) with respect to the deflection of the axis 5 of the cylindrical worm 2 by an angle α in the range of 10 to 30 °. The position of the cylindrical worm 2 relative to the disc wheel 1 is further indicated in Fig. 3, where also their engagement W in the spiral portion 9 (Fig. 2) of the disc wheel 1 is also schematically apparent. is also located at the opposite end of the cylindrical worm 2 and the other side of the spiral toothing of the wheel also for the possibility of bidirectional working of the gear. The utilization of these possibilities is the realization of backlash-free running of this gearing. As schematically indicated, the disk wheel 1 (FIG. 4) divided in the central plane 17, guided by the center of the width of its toothing 9 and the axis 3 of the toothing profile 9 consists of a fixed half 11 with centering collar 14 and shaft 12 on which the free half 16 By rotating the free half 16 in the opposite direction of rotation of the fixed half 11, the opposite sides of the spiral toothing 9 of the disc wheel and the flanks of the thread 8 of the cylindrical worm 2 come into contact. In this position the free half 16 is fixed by screws 13 (FIGS. thus achieving a play free of gearing.

Industrial applicability

A non-backlash worm gear with a wheel arrangement with a construction according to the present invention is designed for gearing with the required increased load-bearing capacity due to lateral helical parts of the gearing and thus increased number of teeth of the gearing in simultaneous engagement.

Claims (2)

PATENT CLAIMS A disc-free worm gearing with a disc wheel, characterized in that the disc wheel (1) consists of two parts, a fixed half (11) and a free half (16) which meet in the center plane (17) of the disc wheel (1); are provided with a common identical spiral toothing (9) following the engagement field of the co-engaging cylindrical worm (2) whose axis (5) is deflected by an angle (α) from the vertical center plane (17) guided by the axis (4) wheels (1) perpendicular to the axis (6) of rotation of the wheel (1). A disc-free worm-wheel worm gearing according to claim 1, characterized in that by splitting the disc wheel (1) in a vertical center plane (17) passing through the width axis (4) of the gear wheel (1) perpendicular to the axis of rotation (6). a fixed half (11) is provided with a centering collar (14) and a shaft (12) on which the free half (16) of the disc wheel (1) is rotatable in the opposite direction of rotation of the fixed half (11) 9) the free halves (16) of the disc wheel (1) with the flanks of the thread (8) of the cylindrical worm (2) and in this position, the free half (16) is fixed by screws (13) to achieve gear-free gearing.