BG64605B1 - Screw gear - Google Patents

Abstract

The gear is used in fastener and transmission mechanism in mechanical engineering. It has increased functional potentials. The gear consists of a screw (1) with a threaded spiral (2) and grooves (3) in which a threaded filet (4) of a nut (5) and a stem (6) is fitted. Width B of the threaded groove (3) is smoothly extended towards the axis of the screw (1) and has a symmetrical form. Nut (5) has an arc (segment-type) shape and has at least one sector (7) of a threaded filet (4) with a shape matching groove (3) which at its external end has two-way spiral chamfers (8) with parallel walls (9).

Description

(54) SCREW GEAR

Technical field

The invention relates to a helical gear used in fastening and transmission mechanisms in mechanical engineering.

BACKGROUND OF THE INVENTION

A helical gear is known, consisting of a screw with a screw channel in which a threaded nut of a nut is located. The nut is solid and has a central tank. The helical gear is with multi-threaded nuts and a screw whose grooves have arched lateral and internally recessed surfaces, and the nut has a rectangular thread profile / 1 /.

The disadvantage of this solution is its limited functionality due to the impossibility of forming arcuate / segment / nuts, the inability to fit several nuts in one made band of screws, the impossibility of side / radial / mounting of compound nuts to the screw and others.

It is an object of the invention to provide a helical gear with increased functionality.

SUMMARY OF THE INVENTION

The problem is solved by means of a screw gear including a screw with a screw channel in which a threaded nut of a nut is located. According to the invention, the width of the screw channel increases smoothly to the axis of the screw to the inner diameter of its channel and is symmetrical in cross-section, and the nut has a body with an arcuate / segment / shape and a threaded profile corresponding to the profile of the screw. the screw channel from the screw.

The nut is composed of two symmetrical parts with respect to the length of the screw channel, which are fixed to each other by a connecting element

The threaded nut of the nut is formed as at least one radial axis whose profile corresponds to that of the screw channel of the screw.

The advantage of the invention is its increased functionality.

Description of the attached figures

Figure 1 is a longitudinal section of a screw gear;

Figure 2 is a cross-sectional view of the screw channel;

Figure 3 is a side view of a screw with two nuts;

Figure 4 is a N view of a compound nut;

Figure 5 is a sectional view along the BB of Figure 4;

Figure 6 is an L view of the nut of Figure 1;

Figure 7 is a section through AA of Figure 1 in the conical shape of the nut coil.

Examples of carrying out the invention

The screw gear consists of a screw 1 with a helical spiral 2 and screw channels 3, in which is located a turn 4 of a nut 5 with a body 6. The width B of the screw channel 3 increases smoothly to the axis of the screw 1, to the inner diameter of its channel 3, which is symmetrical in shape to the body 6 (segmental shape) and at least one portion й of its threaded coil 4, corresponding to the profile of the screw channel 3 of screw 1. On the outer end 8 of the screw channel 3 there are bilateral helical chamfers 9 /. 2 /.

Figure 3 shows a screw 1 with two nuts 5 arranged in one transverse band of the screw gear.

In another embodiment shown in Figures 4 and 5, the nut 5 is integral (two-piece) and consists of two parts 10 in contact along the helical channel 3, which are fixedly fixed to one another by a connecting element 11 of a known type.

In another embodiment shown in Figure 7, the threaded thread 4 of the nut 5 is formed as at least one radial axis 12 with a rotating surface. A corresponding gap is provided between the screw channel 3 of the screw 1 and the radial axis 12 of the nut 5.

Use of the invention

When rotating, the nut 5 moves vin2 exactly in relation to the screw 1. The nut 5 is arcuate in cross-section along its axis and covers part of the surrounding surface of the cylindrical section of the screw 1. The number of nuts 5, Fig. 3 can be increased , and their bodies 6 to 5 are fixedly connected, and in one embodiment, movably interconnected.

The construction of the double nut according to FIG. 4 and 5 allow not only mounting from the end of screw 1, but also mounting on the side (radial) of screw 1. This is accomplished by radially inserting adjacent portions of the screw channel 3 of the individual parts 10 which adjoin each other to shaping the entire nut 5 with subsequent interlocking by means of a clamp 11 or otherwise known.

The nut 5 can also be moved in an angularly bent screw 1, in the presence of gaps between these parts, in accordance with the bending radius of the screw 1. This bending radius can be significantly increased by the rotatably formed coil 4 of the nut according to FIG. 7.

The shape of the screw grooves 3 allows self-adjusting of the nut 5 relative to the screw 1.

Claims (3)

Claims A helical gear including a screw with a screw channel in which a nut of nut is located, characterized in that the width B of the screw channel (3) is gradually increased to the axis of the screw (1) to the inner diameter of the channel (3 ), which is symmetrical in cross-section and the nut (5) is formed by a body (6) with an arcuate (segmental) shape, with at least one section (7) of the profile of its threaded coil (4) corresponding to the profile of the screw channel (3) of the screw (1). Screw drive according to claim 1, characterized in that the nut (5) is composed and has two parts (10) contacting along the helical channel (3), which are fixedly fixed to each other by a connecting element (11). . Screw drive according to claim 1, characterized in that the threaded thread (4) of the nut (5) is formed as at least one radial axis (12) with a rotating surface.