Angular Worm Gear Reducer

TECHNICAL FIELD

The present invention relates to worm gear reducers that do not intersect and are not parallel to each other, transmit force and motion between two shafts (drive shaft and output shaft) whose angle between projections thereof is 90°, and whose drive shaft is comprised of worm gear.

In particular, the present invention relates to preventing failure and efficiency loss that may occur in reducer because of plays (axial dislocation of worm gear) occurring due to wearing of teeth of worm wheel which transmits drive to output shaft on which it is located by obtaining drive from worm gear, which is a drive shaft, in said worm gear reducer.

STATE OF THE ART

Reducers are gear systems that change revolution-torque rate of a rotational motion by means of gears. Reducers are comprised of gearwheels embedded in body, shafts, bearings etc. in terms of its structure. With a different definition, reducers are close gearings designed so as to reduce high rotation speeds of electrical motors to rotation speeds required for machines or systems in which it shall be used.

There are various types of reducers in terms of area of use thereof and gearwheel-shaft mechanism used therein. One of these reducer types is the worm gear reducer. Worm gear reducer is comprised of worm gear with drive shaft that does not intersect and is not parallel to each other, transmits force and motion between two shafts (drive shaft and output shaft) whose angle between projections thereof is 90°. Worm gear reducers are employed in achieving high revolution rates, in cases where rim numbers and speed are lower and in cases where it is necessary to provide more performance with less effort. Shaft axes provide motion and force transmission in the systems that are perpendicular and diagonal to each other. It is mostly employed in cranes, gearboxes, lifts, elevators, textile machines, helm mechanisms, industrial kitchen equipment, machine tools (dividing heads and rotary tables), pumps and transportation vehicles.

The most important problem faced in worm gear reducers employed in state of the art is that tooth of bronze/worm wheel, which drives the output shaft on which it is positioned by means of the drive obtained from worm gear, wears over time. Since axis of the worm gear slides downwardly towards worm wheel due to wearing, this causes gear to operate in plays, namely causes reducer to work inefficiently. In such cases, the sole solution is to replace bronze/worm wheel. This both causes too much costs and requires a higher labour. Furthermore, it causes machine or element of the machine, with which the reducer is connected, not to work until failure is overcome.

In the presence of technical problems above-stated, carrying out a development in related technical field is needed so as to prevent axial dislocation/plays of worm gear occurring due to wearing of worm wheel in worm gear reducers without replacing worm wheel.

OBJECTS OF THE INVENTION

The main object of the invention is to prevent, without replacing worm wheel, failure and efficiency loss that may occur in reducer because of plays (occurring due to downwardly axial dislocation of worm gear towards worm wheel) occurring due to wearing of teeth of worm wheel which transmits drive to output shaft on which it is located by obtaining drive from worm gear, which is a drive shaft, in said worm gear reducer.

In order to achieve the above-mentioned object, gears on the worm gear are manufactured angularly (manufactured from the left towards the right on which motor connecting rim is positioned) in the manufacturing process. In other words, while size of the leftmost gear is h, size of the rightmost (in the motor connecting rim side) gear is manufactured in a H manner (H>h). In case wearings may occur on the worm wheel over time, this problem may be overcome by the fact that the worm gear is pushed from the direction of motor connecting rim in a from left to right direction until angular threads catch the worm wheel, and a liner is put between the bearings in the counter side to push direction and worm gear.

Another object of the invention is to prevent labour and cost so as to replace worm wheel by means of compensating play of worm gear without replacing worm wheel.

Another object of the invention is to increase lifetime of the reducer by manufacturing worm gear angularly (such that its length increases towards the side engaging with the motor connecting rim from left to right) in the manufacturing process.

Another object of the invention is to prevent production loss because of machine or machine element to which reducer is coupled that is not working so as to already replace worm wheel. Another object of the invention is to manufacture reducers equivalent to reducers with plays in terms of both labour and costs compared to reducers with plays being manufactured currently.

The structural and characteristic features of the invention as well as all advantages will be better understood in the detailed description provided by use and reference to the figures given below, and for that reason the assessment should be made based on the said figures and detailed description.

BRIEF DESCRIPTION OF THE FIGURES

Figure 1 is a detailed view of the worm gear portion of angular worm gear reducer being the subject matter of the invention.

Figure 2 is a sectional and detailed view of the worm gear portion of angular worm gear reducer being the subject matter of the invention.

REFERENCE NUMERALS

A. Reducer

1. Main body

2. Worm gear (Drive shaft)

2.1. threads

2.1.1. Small thread

2.1.2. Big thread

3. Bearing

3.1. Liner

4. Bronze/worm wheel

5. Motor connecting rim

6. Output shaft

H. Big thread size

h. Small thread size

H>h

It is not necessary to scale the drawings and the details which are not necessary for a better understanding of the invention may be omitted. Additionally, the elements which are at least substantially identical or at least substantially have identical functions are shown with the same reference number. DETAILED DESCRIPTION OF THE INVENTION

In this detailed description, the preferred embodiments of the reducer (A) being the subject matter of the invention are explained solely for a better understanding of the subject, without generating any restrictive effect.

Worm gear (1) reducers being the subject matter of the invention are employed in achieving high revolution rates, in cases where rim numbers and speed are lower and in cases where it is necessary to provide more performance with less effort and so as to provide transmission of motion and force in the systems whose shaft axes are perpendicular and diagonal to each other.

Worm gear (1) reducer (A) fundamentally comprises a bearing (3) which does not intersect and are not parallel to each other, transmits motion and force between two shafts (drive shaft and output shaft) whose angle between projections thereof is 90°, whose drive shaft is comprised of worm gear (2), is positioned to output shaft (6)on the motion transmission and receives it by means of worm wheel (4) connected with worm gear (2), is positioned at two ends thereof so as to bear axially worm gear (2), and a main body on which all of the elements are positioned (Figure 1).

Worm gear (2) is a cylindrical gear, on which there is a helical thread with 30° of profile angle or which is with an evolvent profiled gear. It is called endless screw because gear size is considerably small, and it has no end during rotation. Gear threads may be manufactured in a right and left gear form as well as number of its rims may be 1 to 8. Having a higher number of gear rims increases efficiency. All of the threads of worm gears (2) manufactured in the present and used in reducers (A) are in equal sizes, wherein they are all in the same angle/plane according to gear body.

Threads of worm gear (2) used in reducers (A) subjected to our invention are in different sizes according to gear body. Namely, threads (2.1) on the worm gear (2) are manufactured angularly (manufactured from the left towards the right on which motor connecting rim (5) is positioned) in the manufacturing process. In other words, while size of the leftmost small thread (2.1.1) is h, size of the rightmost big thread (2.1.2) in the motor connecting rim side (5) is manufactured in a H manner (H>h). In case wearings may occur on the bronze/worm wheel (4) over time, this problem may be overcome by the fact that the worm gear (2) is pushed from the direction of motor connecting rim (5) from left to right direction until angular threads (2.1) catch the worm wheel (4), and a liner (3.1) is put between the bearings (3) in the counter side to push direction and worm gear (2). Said liner (3.1) is a thin plate made out of copper, steel or the likes, wherein it is used to increase bearing clearances in bearing caps.

The bearing (3) used on reducer (A) comprising worm gear (1) subjected to the inventions is a cone bearing, and worm gear (2) comprises angular threads (2.1) is a tapered shaft used. In the manufacturing process, cone machine elements and liner (3.1) are mounted to reducer

(A). In case of wearing of worm wheel (4), a further liner is put into between bearings (3) and worm gear (2) in the counter side to push direction, and axial dislocation/play occurred in worm gear (2) shall be compensated by pushing worm gear (2) toward right direction.