DESC:FORM 2

THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENT RULES, 2003

COMPLETE SPECIFICATION
(See Section 10 and Rule 13)

Title of invention:
ELECTRONIC TRANSMISSION DRIVE SYSTEM FOR VERTICAL TURRET LATHE TABLE ROTATION

Applicant:
BEML Limited
A company Incorporated in India under the Companies Act, 1956
Having address:
BEML Soudha, 23/1, 4th Main,
Sampangirama Nagar, Bengaluru,
Karnataka - 560 027, India

Preamble to the Description:
The following specification particularly describes the invention and the manner in which it is to be performed

CROSS-REFERENCE TO RELATED APPLICATIONS AND PRIORITY
[001] The present application claims priority from Indian provisional application no. 201941053219 filed on 20th December 2019.

TECHNICAL FIELD
[002] The present subject matter described herein, in general, relates to a vertical lathe mechanical processing, and more particularly to an electronic transmission drive system for vertical turret lathe table rotation.
BACKGROUND
[003] Generally, lathes are required for machining of work of greatly varying diameters and shapes. The machining may require variable speed control for performing certain specific machining operations such as, chasing of coarse lead screws, relieving attachment work on hobs and taps. The part to be machined is located on the table also called as a chuck where the part is firmly held by jaws of chuck with a hydraulic pressure of 35 bar. Depending on the type of part or different operations on part, table or chuck is rotated at different speeds. The speed control may comprise of a 20 speed hydraulic operated gear box that requires proper inching after shifting of gears to confirm proper gear mating. The 20 different speeds of the table is achieved through a Gearbox consist of different gears and hydraulic shifters. The prime mover of the Gear box is constant Speed 3-Ph Induction motor, 30 KW, 1440rpm. The Number of Gears and hydraulic shifters are as listed below:-
23T Gear -------1 Gear
26T Gear -------2 Gear
27T Gear -------3 Gear
29T Gear -------4 Gear
72T Gear -------A Gear
44T Gear -------B Gear
62T Gear -------C Gear
60T Gear -------D GEAR
High Speed Gear -E Gear

Gear trains for achieving different speeds are as below:-

1st speed --- A Gear-C Gear-1 Gear---------final table drive--------7 rpm

2nd speed------A--------C------2 Gear-----------final table drive--------8 rpm

3rd speed------A--------C-------3 Gear----------final table drive--------10rpm

4th Speed------A--------C------4 Gear-----------final table drive--------12 rpm

5th speed-------A--------D------1 Gear----------final table drive--------14rpm

6th Speed------A--------D-------2 Gear----------final table drive--------17rpm

7th Speed------A--------D------3 Gear-----------final table drive--------21rpm

8th speed-------A-------D-------4 Gear----------final table drive---------26rpm

9th Speed-------B-------C-------1 Gear----------final table drive---------31rpm

10th speed------B-------C-------2 Gear----------final table drive---------37rpm

11th Speed-----B-------C--------3 Gear---------final table drive----------45rpm

12th Speed-----B-------C--------4 Gear---------final table drive----------56 rpm

13th Speed-----B-------D--------1 Gear---------final table drive----------65rpm

14th Speed-----B-------D--------2 Gear---------final table drive----------79 rpm

15th Speed-----B-------D--------3 Gear---------final table drive----------95rpm

16th speed------B------D--------4 Gear----------final table drive---------117rpm

17th speed------C------E---------1 Gear---------final table drive----------139rpm

18th speed------C------E---------2 Gear---------final table drive----------169rpm

19th speed------C------E---------3 Gear---------final table drive----------203rpm

20th Speed-----C------E---------4 Gear----------final Table drive--------250rpm

The above gear train for different speeds is achieved through hydraulic shifters-

1st shifter-------A to B and B to A

2nd shifter-------C to D and D to C

3rd Shifter-------1 to 2 and 2 to 1

4th Shifter-----3 to 4 and 4 to 3

5th Shifter------ Neutral to E and E to Neutral

All the above speeds are obtained with motor running at constant speed of 1440rpm, and with the above said combinations of gear train.
However, the operation results in improper handling and malfunction of the hydraulic gear box. Further, the inching operation may not be performed regularly by a user.

[004] Hence, the primary objective is to provide an improved electronic controlled table drive transmission especially adapted to reduce mean time repair and increase reliability of the machining. A combination of electronic control apparatus with a variable frequency drive for varying the speed of the machining transmission through a very wide range of speed and by modifying the mechanical gear box to achieve torque and speed characteristics.

OBJECT OF THE INVENTION
[005] Main object of the present invention is to provide the electronic transmission drive for vertical turret lathe table rotation eliminates multiple gear shifters and gear.
[006] Another object of the present invention is to provide an electronic transmission drive for vertical turret lathe table rotation having one set of constant mesh gear and one shifter for different speed or torque requirements.
[007] Yet another object of present invention is to provide an electronic transmission drive for vertical turret lathe table rotation to eliminate the need for inching operation that may not be performed regularly by the operator
[008] Yet another object of the present invention is to provide an electronic transmission drive for vertical turret lathe table rotation to reduce requirement of hydraulic solenoid valves.
[009] Yet another object of the present invention is to provide electronic transmission drive for vertical turret lathe table rotation to eliminate the requirement of 20 speed rotary speed selector switch that is prone to malfunction due to intricate mechanism
[010] Yet another object of the present invention is to conservation of electrical energy by rotating the motor at required speed only rather than rotating at full speed of motor to prevent losses in motor.

SUMMARY
[011] Before the present electronic transmission drive for vertical turret lathe table rotation are described, it is to be understood that this application is not limited to the system(s), and methodologies described, as there can be multiple possible embodiments which are not expressly illustrated in the present disclosures. It is also to be understood that the terminology used in the description is for the purpose of describing the particular implementations or versions or embodiments only and is not intended to limit the scope of the present application. This summary is provided to introduce aspects related to electronic transmission drive for vertical turret lathe table rotation. This summary is not intended to identify essential features of the claimed subject matter nor is it intended for use in determining or limiting the scope of the claimed subject matter.
[012] In one implementation, an electronic transmission drive for vertical turret lathe table rotation is disclosed. In one aspect, the system may comprise of a vertical lathe table connected to an Electrical Induction Motor with a variable frequency drive. A constant mesh gear system and an electronic controller interfacing to Motor controls the rotation of the vertical lathe table.
[013] In one implementation, a method for an electronic transmission drive for vertical turret lathe table rotation is disclosed. In one aspect, the method involves procurement of a variable frequency drive. Further, a hydraulic drive may isolate from a motor. Further, constant mesh gear may be selected to meet the torque requirement. Further, the method involves interfacing of the variable frequency drive to a logic control to study torque or speed characteristics of the machine.
BRIEF DESCRIPTION OF THE DRAWINGS
[014] The foregoing detailed description of embodiments is better understood when read in conjunction with the appended drawings. For the purpose of illustrating of the present subject matter, an example of construction of the present subject matter is provided as figures; however, the present subject matter is not limited to the specific process and system disclosed in the document and the figures.
[015] The present subject matter is described in detail with reference to the accompanying figures. In the figures, the left-most digit(s) of a reference number identifies the figure in which the reference number first appears. The same numbers are used throughout the drawings to refer various features of the present subject matter.
[016] Fig 1 illustrates a schematic of existing gear box (prior art) of vertical turret lathe table rotation
[017] Fig 2 illustrates a flow chart of one other embodiment of the electronic transmission drive system for vertical turret lathe table rotation in accordance with an embodiment of the present subject matter.
[018] Fig 3 illustrates a schematic of one embodiment of an electronic transmission drive system for vertical turret lathe table rotation, in accordance with an embodiment of the present subject matter.
[019] Fig 4 illustrates a schematic of one embodiment of an electronic transmission drive system for vertical turret lathe table rotation retrofitted in the existing gear box (prior art), in accordance with an embodiment of the present subject matter.
DETAILED DESCRIPTION
[020] Some embodiments of this disclosure, illustrating all its features, may now be discussed in detail. The words "comprising," "having," "containing," and "including," and other forms thereof, are intended to be equivalent in meaning and be open ended in that an item or items following any one of these words is not meant to be an exhaustive listing of such item or items, or meant to be limited to only the listed item or items. It must also be noted that as used herein and in the appended claims, the singular forms "a," "an," and "the" include plural references unless the context clearly dictates otherwise. Although any assembly and methods similar or equivalent to those described herein can be used in the practice or testing of embodiments of the present disclosure, the exemplary, assembly and methods are now described. The disclosed embodiments are merely examples of the disclosure, which may be embodied in various forms. Various modifications to the embodiment may be readily apparent to those skilled in the art and the generic principles herein may be applied to other embodiments. However, one of ordinary skill in the art may readily recognize that the present disclosure is not intended to be limited to the embodiments described but is to be accorded the widest scope consistent with the principles and features described herein.
[021] Various modifications to the embodiment may be readily apparent to those skilled in the art, and the generic principles herein may be applied to other embodiments for an electronic transmission drive for vertical turret lathe table rotation. However, one of ordinary skill in the art may readily recognize that the present disclosure for the electronic transmission drive for vertical turret lathe table rotation is not intended to be limited to the embodiments described, but is to be accorded the broadest scope consistent with the principles and features described herein.
[022] In one embodiment, a system for an electronic transmission drive for vertical turret lathe table rotation is disclosed. In one aspect, a variable frequency drive of rating 30KW may be procured. Further, a motor capacity of 30kw may be used for intermittent material removal in sprockets of idlers of various models of bull dozers. The prime mover of the gear box is constant Speed 3-Ph Induction motor, 30 KW, 1440rpm. Further, a hydraulic drive PVB15(Vickers) may be isolated from the motor. Further, the hydraulic drive may be coupled separately by a 3.5kw of an induction motor. Further, a variable frequency drive may be interfaced to an existing logic control to study torque or speed characteristics of the machine.
Referring to figure 3, new gear train is as follows:-
Gear A(1)----Gear D(7)------Gear 3(13) ---------------final table drive---------low speed range/High range torque-------different speeds of table is achieved by varying motor speed through VFD.
Gear D(7)----Gear E(27)-----Gear 3(13)-----------------final table drive---------High speed range/low range torque -------different speeds of table is achieved by varying motor speed through VFD.
The speed from 7 rpm to 21 rpm is achieved from AD3 gear train by varying the speed of the motor.
The speed from 26 rpm to 250 rpm is achieved from DE3 gear train by varying the speed of the motor.
[023] In another embodiment, a method for the electronic transmission drive for vertical turret lathe table rotation is disclosed. In one example, the method involves procurement of the variable frequency drive. Further, the hydraulic drive may isolate from the motor. Further, the constant mesh gear may be selected to meet the torque requirement. Further, the method involves interfacing of the variable frequency drive to a logic control to study torque or speed characteristics of the machine. This system is configured to be retrofitted in the existing gear box of the vertical turret lathe rotation table. Further, a hydraulic shifter may be coupled to control high speed and low speeds, thus replacing 4 shifters. Further, constant mesh gear may be selected to meet the torque requirement. Further, 1(9), 2(11), 4(15), B(3) and C(5) gears and 1, 2, 3, 4 shifters are replaced with dummy steel bushes
[024] Referring now to figure 2, a flow chart for the electronic transmission drive for vertical turret lathe table rotation is illustrated.
[025] At block 202, the variable frequency drive may be procured for vertical turret lathe table rotation.
[026] At block 204, the hydraulic drive may be isolated from the motor.
[027] At block 206, the constant mesh gear may be selected to meet the torque requirement.
[028] At block 208, mounting of gears A(1), D(7), E(27), 3(13) and shifter E(21).
[029] At block 210, the variable frequency drive may be interfaced to a logic control for study of torque or speed characteristics of the machine.
[030] Exemplary embodiments for the electronic transmission drive system for vertical turret lathe table rotation discussed above may provide certain advantages. Though not required to practice aspects of the disclosure, these advantages may include those provided by the following features.
[031] Some embodiments of the electronic transmission drive system for vertical turret lathe table rotation eliminates multiple gear shifters and gear.
[032] Some embodiments of the electronic transmission drive system for vertical turret lathe table rotation requires one set of constant mesh gear and one shifter for different speed or torque requirements.
[033] Some embodiments of the electronic transmission drive system for vertical turret lathe table rotation eliminates need for inching operation that may not be performed regularly by the operator.
[034] Some embodiments of the electronic transmission drive system for vertical turret lathe table rotation reduces requirement of hydraulic solenoid valves.
[035] Some embodiments of the electronic transmission drive system for vertical turret lathe table rotation eliminates the requirement of 20 speed rotary speed selector switch that is prone to malfunction due to intricate mechanism.
[036] Although implementations for the electronic transmission drive system for vertical turret lathe table rotation have been described in language specific to structural features and/or methods, it is to be understood that the appended claims are not necessarily limited to the specific features the electronic transmission drive for vertical turret lathe table rotation as described. Rather, the specific features are disclosed as examples of implementations of the electronic transmission drive for vertical turret lathe table rotation.
[037] REFERRAL NUMERALS:
Element Description Reference Numeral
Gear A 1
Gear B 3
Gear C 5
Gear D 7
Gear 1 9
Gear 2 11
Gear 3 13
Gear 4 15
Shifter A-B 17
Shifter C-D 19
Shifter E 21
Shifter 1-2 23
Shifter 3-4 25
Gear E 27
Bush 29a – 29f

,CLAIMS:

1. An electronic transmission drive system for vertical turret lathe table rotation comprising:
at least one electronic variable frequency drive configured to rotate a motor at variable speeds; and
at least one gear box configured with plurality of gears to form combination of gear trains wherein, first gear train is configured to provide low speed and high torque and second gear train is configured to provide high speed and low torque.

2. The electronic transmission drive system for vertical turret lathe table rotation as claimed in claim 1, wherein said electronic variable frequency drive is configured to control the speed of the motor.

3. The electronic transmission drive system for vertical turret lathe table rotation as claimed in claim 1, wherein gear A(1), gear D(7), gear E(27) and gear 3(13) configured to form combination of gear trains.

4. The electronic transmission drive system for vertical turret lathe table rotation as claimed in claim 1, wherein said gear A(1), gear D(7) and gear 3(13) are configured to form first gear train.

5. The electronic transmission drive system for vertical turret lathe table rotation as claimed in claim 1, wherein said first gear train is configured to provide speed range from 7 rpm to 21 rpm by varying motor speed through electronic variable frequency drive for low speed and high torque applications.

6. The electronic transmission drive system for vertical turret lathe table rotation as claimed in claim 1, wherein said gear D(7), gear E(27) and gear 3(13) are configured to form second gear train.

7. The electronic transmission drive system for vertical turret lathe table rotation as claimed in claim 1, wherein said second gear train is configured to provide speed range from 26 rpm to 250 rpm by varying motor speed through electronic variable frequency drive for high speed and low torque applications.
8. The electronic transmission drive system for vertical turret lathe table rotation as claimed in claim 1, wherein, the shifting of gear train from first gear train to second gear train is performed by a hydraulic shifter provided in the gear box.

9. The electronic transmission drive system for vertical turret lathe table rotation as claimed in claim 1, wherein said system is configured to be retrofitted in the existing system by inserting dummy bushes in place of gear 1(9), gear 2(11), gear 4(15), gear B(3) and gear C(5).

10. The electronic transmission drive system for vertical turret lathe table rotation as claimed in claim 1, wherein said motor is configured to provide speed range from 7 rpm to 250 rpm.