CN102102736A - Worm gear transmission device - Google Patents

Abstract

The present invention relates to a worm gear transmission device which is provided with a worm and a worm wheel that is rotatably engaged with the worm. The worm wheel is rotatably supported in a plate-shaped housing. The invention is characterized in that: the worm wheel forms a worm wheel plate (3); the plate-shaped housing (4) is provided with a first housing plate (5) and a second housing plate (6); furthermore the first housing plate (5) and the second housing plate (6) are connected with each other at a mounting position, and simultaneously a preset pretightening force is formed.

Description

Worm Gears

technical field

The invention relates to a worm gear having a worm and a worm wheel arranged in rotatable mesh with the worm, the worm being mounted rotatably in a plate-shaped housing.

Background technique

Known from EP 1 422 187 A1 is a worm gear with a worm and a worm wheel, which mesh in rotation with each other. The worm gear is arranged annularly and is coupled to a further inner ring via roller bearings. In order to achieve a self-braking effect, a braking device is provided with a set of friction discs stacked one above the other in layers. The braking device extends on the worm between a drive motor and an end of a worm shaft. Undesirable increases in noise and vibrations during operation are thereby avoided.

Contents of the invention

The object of the invention is to further improve a worm gear in such a way that a long service life and a high load capacity are ensured in a simple manner.

To accomplish this task, the invention is characterized in that, in conjunction with the preamble of claim 1, the worm gear is formed as a worm wheel disk, the plate-shaped housing has a first housing plate and a second housing plate, and the first The housing plate and the second housing plate are connected to each other in an assembly position, while simultaneously creating a predetermined pretension.

A particular advantage of the invention is that the load capacity of the worm gear is improved in a simple manner and the service life of the worm gear is increased. Especially under changing load conditions, tension or pressure fluctuations are reliably avoided.

Preferably, the worm is held without play by means of a spring device with the worm wheel in rotational engagement. As a result, the relative position of the worm to the worm wheel can be automatically readjusted during operation. This makes it possible, for example, to compensate for the ellipticity of the gear. In addition, the loadability in the case of high temperature fluctuations can be improved. In addition, worms and worm gears can be machined with higher tolerances, since tolerance compensation is performed by the holding device during operation.

Further advantages are given by the dependent claims.

Description of drawings

An exemplary embodiment of the invention will be described in detail below with reference to the drawings.

in:

Fig. 1 is according to the longitudinal sectional view of worm gear of the present invention, and

Figure 2 Cross-sectional view of the worm gear.

Detailed ways

The worm gear according to the invention can be used in drives, for example in solar tracking systems, in medical technology applications, for tilting large free arm surfaces on operating tables and x-ray machines. Solar tracking systems are used in photovoltaic devices to track the position of solar panels relative to the sun. In addition, the worm gear according to the invention can be used in mechanical engineering concepts, display devices, rotating or pivoting devices which can withstand high loads. The worm gear can be used in those places that require a large holding torque and no large backlash (relativ groβeSpielfreiheit).

The worm gear 1 according to the invention essentially consists of a worm 2 and a worm disk 3 which are connected to each other by a rotational engagement. The worm wheel 3 and the worm 2 are mounted in a plate-shaped housing 4 . The plate-shaped housing 4 is formed from a first housing plate 5 and a second housing plate 6 , which are connected to one another by screw connections via a plurality of fastening holes 7 which are likewise arranged in the outer region.

The worm 2 is mounted on the side facing the drive motor 9 so as to be pivotable via a holder 8 about a pivot axis which extends parallel to a rotational axis D of the worm wheel 3 . The holding device 8 is thus located in the region between the worm 2 and the drive motor 9 , wherein a longitudinal web 10 integrally connected with the worm 2 is held rotatably in the holding device 8 and is fixed in rotation with a shaft 11 of the drive motor 9 ground connection.

On the side of the worm 2 facing away from the holding device 8 , a spring device 12 is arranged which acts on a second longitudinal web 13 which is integrally connected to the worm 2 . The spring device 12 preferably has a leg spring 15 whose pretension is adjustable. The spring device 12 makes the worm 2 and the worm wheel 3 always be in a gap-free meshing state. Advantageously, this ensures a permanent play-free or readjustment of the worm screw 2 , preferably in the radial direction of the worm wheel 3 . The second longitudinal web 13 is held in a needle roller bushing 14 in the region of the spring device 12 , against which the leg spring 15 acts. The pretension of the disk spring 15 is adjustable via a threaded pin 16 .

The worm wheel 3 has a central bore in which, for example, a swivel tube of a photovoltaic system can be mounted in a rotationally fixed manner. The worm wheel 3 is supported between the first housing plate 5 and the second housing plate 6 , while a number of ball elements 17 are supported on both flat sides of the worm wheel 3 relative to the housing plates 5 , 6 . The ball elements 17 are mounted in a radially outer region on the one hand in a defined manner in corresponding recesses on the inner side of the first housing plate 5 or 6 and on the other hand in a defined manner on the worm wheel disk. 3, wherein the rotatability of the worm wheel 3 is ensured even if the housing plates 5 and 6 are pressed onto the ball elements 17 while forming a constrained pretension. This results in a high axial prestressing force, which is distributed over, for example, fifty ball elements 17 . When higher torques occur during operation, the lines of force are kept short, wherein a high number of ball elements reduces the force to be transmitted per ball element, the first and second housing plates 5 and 6 act somewhat like spring plates Assembled in such a limited and preloaded manner.

In order to ensure a predetermined distance between the first housing plate 5 and the second housing plate 6 , edge-shaped spacers 18 are provided.

The first housing plate 5 and the second housing plate 6 as well as the spacer 18 are produced from a metal material, in particular a steel material.

According to an alternative embodiment not shown, the worm wheel 3 can also form a worm ring which has a small diameter as the worm wheel 3 .

The holding device 8 is designed to be slightly displaceable and/or rotatable.

The ball element 17 is seated in a recess in the housing plates 5 , 6 and the worm wheel 3 . Manufacturing is thereby simplified.

The ball elements 17 are preferably supported in two concentric, preferably groove-shaped ball tracks of the worm wheel 3 and of the housing plates 5 , 6 , wherein the ball tracks running on both sides of the worm wheel 3 are radially offset from one another. set up. As a result, installation space can be saved.

Claims (7)

1. worm gearing, it has a worm screw and a worm gear that is provided with this worm screw rotation engagement, this worm gear can be rotated to support in the plate shape housing, it is characterized in that, worm gear constitutes a worm gear dish (3), plate shape housing (4) has one first shell plates (5) and one second shell plates (6), and first shell plates (5) and second shell plates (6) interconnect at a rigging position, forms predetermined pretightening force simultaneously.

2. worm gearing as claimed in claim 1 is characterized in that, worm screw (2) can place a kind of and the gapless engagement of worm gear dish (3) by a spring assembly (12).

3. worm gearing as claimed in claim 1 or 2 is characterized in that, spring assembly (12) has a butterfly spring (15), and its pretightening force is adjustable.

4. as the described worm gearing of one of claim 1 to 3, it is characterized in that, worm gear dish (3) is via many ball element (17) supportings that are provided with at two planar sides of worm gear dish (3), and wherein said ball element (17) extends in one of worm gear dish (3) radially outside zone.

5. as the described worm gearing of one of claim 1 to 4, it is characterized in that the removable a little and/or rotatably setting of holding device (8).

6. as the described worm gearing of one of claim 1 to 5, it is characterized in that described ball element (17) is arranged in the groove of worm gear dish (3) and/or shell plates (5,6).

7. as the described worm gearing of one of claim 1 to 6, it is characterized in that described ball element (17) is arranged in the ball track that radially shifts to install each other.

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