Worm reduction gearbox

FIELD: machine building.

SUBSTANCE: invention can be used in drives at high axial loads on screw (for several thousands of kilograms) and its higher revolutions (about 1500 revolutions per minute and more). Worm reduction gearbox contains screw (4), rest of which contains main bearing assembly (5), receiving axial and radial load. External not rotating rings of bearings (7, 8) of this main assembly interact to resilient members (9), second butts of which rest into butt supports (10), rigidly connected to casing (1). Bearings (7, 8) by inner rotating rings interact by means of resilient members to butt supports (13) of screw tail (4). Bearing (7), which is the first thrust face, treansfers it to resilient member (9), which at achievement of part of axial effort, for which it is calculated bearing starts deformation, and screw starts displacement lengthwise axis so that butt support (13) of screw starts impact on resilient member of rotating ring of the second bearing (8), and at selection of clearance in 0.02-0.03 mm between butt of casing of resilient member and rotating ring, bearing starts perceive its part of load.

EFFECT: invention provides perceiving of axial load at high revolutions of screw.

5 cl, 2 dwg

 

The invention relates to the field of engineering, in particular, to the design of the worm gears and more particularly to supports of the worm gear.

The aim of the invention is to provide a bearing support screw nut, perceiving high and high axial loads at high revolutions of the worm by the perception of these loads multiple bearings that are installed in series on the same shaft, so that the axial load on the worm is evenly distributed on each of these bearings. There are several options for obtaining this result, described in the Handbook "Bearings" authors Roamana and Bvitamin. State scientific and technical publishing house of the engineering literature, Moscow, Leningrad, 1959, SCR-243. In this section of the Handbook, the authors point out a problem bearing in the perception of their considerable axial forces at high rotational speeds of the shafts.

The essence of these methods and structures bearing assemblies is that angular contact ball bearings are selected with different contact angles and different radii of the raceways, and is revised (blocking) ends their rings or remote installation of spacers between the bearing rings, the dimensions of which are determined by a rather complicated formula that makes PR is the application of these methods and structures are practically unacceptable for production, as confirmed by time.

The disadvantages of these methods and structures include the difficulty of their implementation in real production conditions and low probability of uniform distribution of the axial load between all bearings bearings.

Known bearings of the worm gear shown on RIS "And" str textbook D. Reshetova. "Machine parts". Moscow. Mechanical engineering, 1974 Bearing consists of two nodes, left and right, have towards each other (opposite) one ball angular contact ball bearing, which absorb both axial and radial loads.

Characteristic feature of this worm reducer are:

1. The gearbox includes a housing with a lid.

2. The gear includes a worm wheel with bearings.

3. The gearbox contains a worm.

4. Bearing of the worm consists of two nodes.

5. As supports the worm uses two ball angular contact bearing.

6. Angular contact bearings are mounted towards each other (opposite).

Signs 1, 2, 3, 4 are shared with the features of the proposed worm gearbox.

The disadvantages of this design supports the worm is:

1. The use of ball angular contact bearings does not provide the perception of a significant axial loads, the more that EfE is th load perceives only one bearing.

2. The scheme of the bearing unit such that the occurrence of thermal deformation of the worm increases the axial load on the bearings, which reduces their efficiency.

Known bearings of the worm gear shown on RES "B" str textbook D. Reshetova. "Machine parts", Moscow. "Engineering" 1974 Bearing consists of two nodes, one of which has two angular contact tapered roller bearing forward (opposite) to each other, which absorb both radial and axial loads in both directions. In another, the secondary node, has one radial roller bearing, perceiving only radial loads and to compensate for thermal deformation of the worm.

The disadvantages of this analogue is that support it are not able to perceive significant axial loads, as only one bearing perceives it in the same direction.

Characteristic feature of this analog are:

1. The gearbox includes a housing with a lid.

2. The gear includes a worm wheel with bearings.

3. The gearbox contains a worm.

4. Bearing of the worm consists of two nodes: the main perceiving radial and axial load, and additional perceiving radial load.

5. Basically the site has two angular contact, cony is a mini-roller bearing forward (opposite) to each other so that what they perceive as the axial load in both directions and radial load.

6. In the secondary node has one radial roller bearing, perceiving only radial load.

This analog, as the closest to the technical essence and adopted for the prototype.

Items 1, 2, 3 and 4 are shared with the features of the proposed gear.

The aim of the invention, as indicated on page 1, is the Foundation of a worm, can sustain heavy axial loads at high speeds, in cases where the health of one bearing is not sufficient for the perception of the existing load.

This objective is ensured by the use of such technical solutions, such as:

1. Basically the reference node of the worm installed in series angular contact tapered roller bearings. Consistently conical angular contact roller bearings provides the perception of all bearings axial load in one direction.

2. Bearings, perceiving radial and axial loads, except the last, non-rotating outer rings interact with elastic elements. This interaction of the outer non-rotating rings with elastic elements provides consistent loading of the bearings axial force after reaching asceneunink in the previous bearing.

3. Elastic elements of the second ends rest against the end supports are rigidly connected with the housing. These intermediate end supports rigidly connected with the housing, provide a perception of the axial design load one of the bearing.

4. Elastic elements are drawn in force, equal parts full axial load, which depends on the number of bearings in the support. It is this calculated and calibrated force provides the perception of bearing that axial forces, which can perceive the bearing, as even after minor deformation of the elastic element force is transmitted to the next bearing.

5. Additional site contains a conical angular contact roller bearing receiving the radial load. Set this bearing allows additional node to perceive not only radial load and axial in emergency situations, for example, when short-term reverse gear when the axial load changes its direction.

6. Conical angular contact roller bearings inner rotating rings, except the first bearing primary node, interact with end bearings of the shaft of the worm via elastic elements. This interaction via elastic elements provides a consistent inclusion in the bearings after the previous loaded bearing its full designed load.

Characteristic feature of the inventive worm gear are:

1. The gearbox includes a housing.

2. The gearbox contains the cover.

3. The gear includes a worm wheel with bearings.

4. The gearbox contains a worm with support elements.

5. The supporting elements contain two nodes: primary and secondary.

6. The main bearing unit contains bearings, interacting, except the last, non-rotating rings with elastic elements.

7. Elastic elements with their second ends rest against the end supports are rigidly United with the body.

8. The second and all following bearings installed in series relative to the first bearing for axial load in one direction.

9. Bearings both nodes have their own rotating rings interact with end bearings of the shaft of the worm.

10. As supports the primary node uses angular contact tapered roller bearings.

11. Additional bearing unit of the gearbox contains a conical angular contact roller bearing, mounted opposite similar to the bearings of the primary node.

12. Each elastic element is non-rotating rings drawn in full force axial load divided by the number of bearings, perceiving axial load.

13. The second and subsequent the e bearings of the primary node and the bearing additional node are tightened against the end supports of the shank of the worm so that between the ends of the rotating rings and rings with elastic elements in the Assembly is a gap in 0,02-0,03 mm

Signs 1, 2, 3, 4 and 5 are shared with the characteristics of the prototype, signs 6, 7, 8 and 9 are essential and distinctive, and signs 10, 11, 12 and 13 are dependent characteristics.

The figure 1 shows the side view of the gearbox. The figure 2 shows the section a-a rotated counterclockwise by 90.

The gearbox consists of a housing 1 with the installed worm wheel 2 with the output shaft 3 with the supports. With the worm wheel 2 interacts worm 4, mounted in the primary node 5 and the left supplementary node 6. In the primary node has 2 angular contact tapered roller bearing 7 and 8. The bearing 7, the first perceiving axial load Grew, its non-rotating ring interacts with the elastic element 9, the second end abuts against the end support 10, is rigidly connected to the body 1 by means of pins 11. The bearing 8 communicates through the elastic element 12 with the front pillar 13 of the shank of the worm 4. In the left supplementary node 6 has a radial-thrust tapered roller bearing 14 that communicates an inner ring and an elastic element 15 and a nut 16. The gearbox is closed by a cover 17.

The principle of the proposed gear describe for example the worm ner is versiunea gear, in which the axial load exceeds twice the tolerable performance bearing, which can be installed in the main support.

Worm reducer works in the following way:

The rotation from the motor shaft through the pressure relief element is applied to the worm shaft 4, which transmits the rotation of the worm wheel 2, and then the rotation is transmitted to the output vertical shaft carvaka 4 reported clockwise rotation "and" when observed from the side of the motor. When this worm wheel 2 to rotate in a counterclockwise direction "b" when viewed from above. Axis as the load Grew to be aimed right at the primary site 5 bearings of the worm. The first axial load perceives conical angular contact roller bearing pos.7, outer non-rotating ring which rests against the elastic element 9, the second end abuts against the end support 10, is rigidly connected with the housing by means of pins 11. The elastic element 9 calibrated and preloaded through the end support 10 by a force equal to half of the full axial load, after which the end bearing 10 stiftelse pins 11. When you reach half of the maximum axial load of the elastic element 9 will begin to shrink. When this worm will begin to move in the axial direction up until the end bearing (locking ring) 13, influencing other elastic ele is UNT 12, don't choose a gap of 0.02-0.03 mm and its tough body is not rested in the inner rotating ring of the second conical angular contact roller bearing 8, which leads to the fact that the bearing 8 begins to perceive the second half of the axial load Increased. Thus the axial load is perceived in two bearings. In the supplementary node 6 of the worm is also tapered angular contact roller bearing 14 to the radial load, but so that he can perceive and axial load in the direction opposite to the direction of the main axial load Grew. The perception of the opposite axial loads may occur in emergency situations when necessary to serverservice gear for a short time.

In such major nodes supports a worm can be installed consecutively three or more conical angular contact roller bearing as described above, depending on the size Grew and the health of the bearings.

In the main node of the worm can be used and angular contact ball bearings and thrust bearings, in combination with a radial bearing. However, economically feasible, the use of these angular contact tapered roller bearings.

1. Worm gearing, comprising a housing, a cover, a worm wheel with the output shaft and bearings, h is rvac, bearing which contains the primary site, perceiving axial and radial load, and a secondary node receiving the radial load, characterized in that, with the aim of increasing the axial load at high rpm screw nut, main bearing Assembly includes bearings, interacting, except the last, non-rotating rings with elastic elements, which are the second of its ends abuts the end supports are rigidly United with the body, after which the second and subsequent bearings installed in series relative to the first bearing and the rotating rings interact with end bearings of the shaft of the worm.

2. Worm reducer according to claim 1, characterized in that the bearing supports the primary node uses angular contact tapered roller bearings.

3. Worm reducer according to claim 1, characterized in that the additional node of the gearbox contains a conical angular contact roller bearing, mounted protivonapravlennyh similar to the bearings of the primary node.

4. Worm reducer according to claim 1, characterized in that each elastic element is non-rotating rings drawn in full force axial load divided by the number of bearings, perceiving axial load.

5. Worm reducer according to claim 1, characterized in that the second and last is blowing the bearings of the primary node and the bearing additional node of odpruzeni relative to the end supports of the shank of the worm, so between the ends of the rotating rings and rings with elastic elements in the Assembly is a gap in 0,02-0,03 mm



 

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