DESC:
TECHNICAL FIELD OF THE INVENTION
The present invention relates to the field of automobiles, and in particular the invention relates to a drum brake system. More particularly, the invention relates to an automatic slack adjuster in an air drum brake system which eliminates excess motion in a brake actuator mechanism used to apply the brake for effective braking.

BACKGROUND OF THE INVENTION
Over the life of the brake linings of a brake, such as a pneumatic drum brake used on commercial vehicle axles, as the brake's friction linings wear the clearance between the brake linings and their respective friction surfaces (for example, the inner surface of a brake drum) increases. This increasing clearance requires an ever-increasing range of motion from the brake actuator mechanism to move the brake linings from their rest position to the point at which the linings contact the friction surface.

It has become common place to include an slack adjuster in the mechanical path between the brake actuator and the brake linings so as to eliminate excess lining travel slack as the brake linings wear.

Slack adjuster is used for the adjustment of the Gap between the Liner and the brake drum based on the wear of the liner during the course of use. A liner is a friction material used in the brakes, which will wear due to the friction with Brake drum during the application of brake to retard the vehicle speed by the vehicle driver. The Gap is currently adjusted by the slack adjusters based on the derived clearance between the liner and the Brake drum inner Surface either through the clutching mechanism or through the stroke measurement mechanism.

For some of the existing automatic slack adjuster, reference is made to a document US8973722B2 which discloses an improved self-adjusting automatic slack adjuster for reducing slack in the brake of a vehicle is provided, in which an easily accessible external operating feature permits the automatic slack adjuster's one-way clutch assembly to be readily disengaged to allow smooth release and retraction of the brake shoes of a vehicle brake without damage to the one-way teeth of the clutch assembly. When the external feature is operated in a brake release direction, the motion of the feature is translated into a motion which axially displaces an output part of the one-way clutch away from an input part of the clutch a distance sufficient to disengage the parts' oneway teeth, thereby disengaging the one-way clutch to permit brake shoe retraction without resistance from the one-way clutch.

Further, reference is made to US6293370B1 which discloses a vehicle braking system adapted to apply a brake lining to a brake rotor, and having a clearance control device for maintaining the free running clearance between the brake lining and the brake rotor during the non-braking phase, comprising an electric motor (40) for adjustment of the brake lining position relative to the brake rotor, with the adjustment being arranged to take place only during the brakes-off condition for the Disc brake system.

Still further, reference is made to US5207299 A which discloses a brake actuating device is furnished with a device for slack readjustment of a brake, in particular of a vehicle brake. Defects in the area of the slack readjustment device can result in an erroneous and defective brake behavior. This document device furnishes a continuous control of the brake release gap and of the brake lining wear. The motion of the brake mechanism is used for the generation of a first measurement distance (s). The motion of the slack readjustment device (5, 7) is used for the generation of a second measurement distance (n). A regulating distance (q), formed by a super positioning of the measurement distances (s) and (n), can be scanned and recorded with a distance sensor (17) of a signal generator (18). The signal, corresponding to the regulating distance (q), can be transformed into signals corresponding to the measurement distances (s) and (n) in an evaluation device. The evaluation device serves for a continuous surveillance and monitoring of the brake release gap and of the brake lining wear at a vehicle or in a diagnostic center, where the evaluation device can be connected to the vehicle.

Furthermore, reference is made to a prior art document WO2007023508 A1 which discloses an improvement on Automatic Brake Adjuster with flexible reference point wherein one-way lock mechanism and clutch mechanism are integrated in one part and located on the worm shaft with the provision of isolating the one way lock mechanism and regulator worm gear wheel from heavy clutch spring load by a thrust sleeve arrangement for independent function. One-way lock mechanism is meant for sensing the excess lining clearance and adjusting the slack between the brake lining and brake drum whereas the clutch mechanism is to ignore the excess stroke of brake actuator due to elasticity in the foundation brake parts of a vehicular braking system.

Reference is also made to a prior art document US8302742 B2 which discloses a self-adjusting automatic slack adjuster for reducing slack in the brake of a vehicle, in which a one-way clutch assembly is arranged in the housing of the automatic slack adjuster housing such that a thin-wall region of the housing associated with the gear drive of the one-way clutch assembly is located outside of a load path through which brake applications forces are conveyed from a brake actuator to a brake cam shaft upon which the automatic slack adjuster is located. The new positioning of the one-way clutch assembly drive results in unexpectedly lower stress levels in the automatic slack adjuster, resulting a more durable slack adjuster and permitting surprisingly large increases in slack adjuster capacity rating.

Reference is also made to a prior art document WO2003083322 A1 which discloses an automatic brake adjuster for adjusting the slack between the brake lining and brake drum of a vehicular braking system comprising a housing (1) accommodating an internally splined worm wheel (3) for receiving the S-cam shaft of the system; a worm shaft (4) positioned perpendicularly to the axis of the worm wheel (3) and meshing therewith; a control arrangement (12, 13, 14, 15 and 17) for controlling the movement of a clutch worm wheel (6), depending upon the angular movement of the adjuster, clutch worm wheel (6) being mounted on the worm shaft (4) and forming a clutch by serration (6') of the clutch worm wheel engaging with the serration (4') of the worm shaft, under the influence of a heavy compression spring (9), the control gear (12) located in the worm wheel bore of the body (1) being permanently fastened to the control arm (13) having a fixing arrangement (13') for rigidly fixing to the chassis of the vehicle, to establish a reference; a pinion assembly comprising a ratchet (16') and pawl (26) mechanism between the pinion (16) and the control worm screw (19), Guide (20), screw (21), spindle (23) and spring (24) and positioned parallel to the axis to control gear wheel (12) and perpendicular to the axis of worm shaft (4), the pinion (16) meshing with the control gear wheel (12) and being guided in the body (1), whereby the ratchet (16') and pawl (26) mechanism provided between pinion (16) and control worm screw (19) functions as one-way lock and allows free rotation of pinion (16) during counter clockwise rotation under resistance from the pawl spring (27) to prevent over-riding while clutch worm gear (6) is in disengaged condition the ratchet (16') and pawl (26) mechanism also permitting required axial movement of the control worm screw (19) to control the desired slack, the excess lining clearance being thus sensed to reference point and adjusted by said ratchet (16') and pawl (26) mechanism to maintain optimum brake lining clearance.

Further, reference is made to a prior art document US20070012529 A1 which discloses an automatic slack adjuster for vehicle brakes to adjust the brake system to compensate for brake wear. The automatic slack adjuster has a body pivotable about an axis for transmitting torque to a brake shaft and at least one component with a toothed portion that includes a ceramic material, such as for example one or both components of a toothed conical clutch.

In view of the above prior art teachings, it is noted that at present the self-setting slack adjusters are being used, which provide the derivative clearance based on the various considerations. Further, in the prior art, the type of the slack adjuster is a typical manual slack adjuster which needs to be set by using the manual rotation of the worm wheel to meet the criteria. Hence, there are many disadvantages associated with conventional slack adjustment system.

Therefore, in view of the drawbacks of the prior art, there is a dire need to provide an automatic slack adjuster for air drum brake system which eliminates the above drawbacks in the existing drum brake system.

SUMMARY OF THE INVENTION:
This summary is provided to introduce a selection of concepts in a simplified format that is further described in the detailed description. This summary is not intended to identify key or essential inventive concepts.

An objective of the present invention is to provide an automatic slack adjuster for air drum brake system which has fully automatic adjustment and requires no manual intervention during the regular course of actions.

Another objective of the present invention is to provide an automatic slack adjustment using the electrical motor integrated to drive the Worm of the Slack adjuster for adjusting the clearance of the brake liners with respect to the Brake drum inner Surface in the Air drum brake system.

Yet another objective of the invention is to provide an automatic slack adjuster which provides better safety by actual gap adjustment.

Still another objective of the present invention is to provide an automatic slack adjuster which is easy to manufacture and is cost efficient.

Accordingly, in one aspect, in one implementation, the present invention discloses an automatic slack adjuster device for air drum brake system, wherein said device comprising a housing comprising: at least an electrical motor with integrated planetary reduction integrated in said housing; at least a worm drive arrangement having a worm means meshing with a worm wheel, wherein said worm being driven by said electrical motor; at least a rotating machine element to couple said electrical motor to said worm drive arrangement. wherein said electrical motor enabled to drive said worm drive arrangement using said rotating machine element, resulting in rotation of at least a camshaft means, for adjusting at least a specified gap between at least a brake liner and a drum brake in said air drum brake system.

In one aspect, in second implementation, an automatic slack adjuster device for air drum brake system, wherein said device comprising a housing comprising: at least an electrical motor with integrated planetary reduction integrated in said housing; At least a worm drive arrangement having a worm means meshing with a worm wheel, wherein said worm being driven by said electrical motor; at least a rotating machine element to couple said electrical motor to said worm drive arrangement. The electrical motor enabled to drive said worm drive arrangement using said rotating machine element, resulting in rotation of at least a camshaft means, wherein said specified gap between said brake liner and said drum brake inner surface adjusted by enabling at least a brake liner contacting at least a brake drum inner surface to create a reference and thereby adjust back to create and maintain at least a predefined gap between said brake liner and said brake drum inner surface.

In both the implementations, the rotating machine element is selected from at least a slack means.

In both the implementations, the automatic slack adjuster device further comprises at least sensing means for sensing said brake liner wear out to generate signal for enabling said electrical motor driving said worm means.

In both the implementations, the sensing means is selected from at least an electronic system or integrated timers or combinations thereof.

In both the implementations, the adjustment of said gap is done when said brake line is in no contact with said sensing means.

In both the implementations, the housing comprising at least an air chamber connection point to ensure at least a pressure input for movement of said slack adjuster device into said air drum brake system.

In second aspect, in one implementation, the present invention discloses a method for ensuring a gap between a brake liner and a drum brake inner Surface of an air drum brake system. The method comprising:
• receiving, by means of electrical motor with integrated planetary reduction, at least an electrical signal as an input from a sensing means;
• driving, by means of said electrical motor with integrated planetary reduction, a worm means;
• rotating, by said driven worm means, a worm wheel and thereby enabling rotation of a cam shaft for automated adjustment of gap between said brake liner contacting said brake drum inner Surface;
• wherein, said rotation of said cam shaft enable the Brake liner reaching a hardpoint with respect to the drum brake inner surface, wherein upon reaching the hardpoint, the brake liner driven back by said electrical motor with integrated planetary reduction through the worm means, thereby ensuring said gap between the drum brake inner Surface and the brake liner.

In third aspect, in one implementation, the present invention discloses an air drum brake system comprising: a brake liner; a drum brake; characterized in that, said air drum brake system comprising: an automatic slack adjuster device for adjusting a gap between said brake liner and said drum brake inner surface, wherein said device comprises: an electrical motor with integrated planetary reduction to meet the intended torque for adjustment integrated in a housing; a worm drive arrangement having a worm means meshing with a worm wheel, wherein said worm being driven by said electrical motor; a rotating machine element. The electrical motor enabled to drive said worm drive arrangement using said rotating machine element, resulting in rotation of a camshaft means.

In accordance with the purposes of the invention, the present invention as embodied and broadly described herein provides an automatic slack adjuster device for air drum brake system which eliminates the need for the manual adjustments in the system. It provides an automatic slack adjuster using an electrical motor integrated to drive the worm of slack adjuster for adjusting the clearance of the brake liners with respect to the brake drum in the air drum brake system wherein the adjustment is by rotation of the cam shaft through the worm and worm wheel mechanism. Electrical Motor with integrated planetary reduction to meet the intended torque for adjustment will drive the Worm based on the need and worm will drive the Worm wheel resulting in the rotation of the Cam Shaft adjusting the gap of Brake Liner for air drum brake systems.

In one implementation, the present invention provides an automatic slack adjuster which uses an electrical motor with integrated planetary reduction integrated to rotate the Worm for adjusting the clearance of the brake liners with respect to the Brake drum in the Air drum brake system.

In one implementation of the present invention, the adjustment is by rotation of the cam shaft through the worm and worm wheel mechanism using the electrical motor with integrated planetary reduction to meet the required capacity and is based on the clearance detection by the sensor between the brake drum and the liner.

In one implementation of the present invention, the sensor tip is set to the liner and connected other side with the electrical wiring. The sensor will sense liner Wear out resulting the signal for the electric motor of the Slack adjuster for adjustment.

In another Implementation, the intended gap between the Brake Liner and the Brake drum is achieved through an Automated adjustment by Liner contacting the Brake drum inner surface to create a reference and adjust back to create and maintain the predefined and intended gap between the Brake Liner and the Brake Drum inner surface. This system requires no additional or Physical sensors and is performed at predefined intervals or sequences either using the electronic system or integrated timers. This also eliminates the need for manual adjustment or set up requirements during the installation or initial setup Air Drum brake system assembly.

Based on the various implementations of the present invention, the liner in the drum brake system is adjusted based on the actual liner wear by rotating the Cam Shaft using the electrical motor with integrated planetary reduction to meet the intended toque to rotate the worm in the slack adjuster.

The above aspects and advantages will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings and claims.

BRIEF DESCRIPTION OF ACCOMPANYING DRAWINGS
It is appreciated that the drawings provided in the present disclosure only illustrate application examples of the present disclosure and are therefore not to be construed as limiting its scope. The foregoing disclosure provides additional information with additional specificity and detail with the accompanying drawings, which are listed below for quick reference.

Figure 1: shows an automatic slack adjuster according to one implementation of the present invention.

Figure 2: shows a foundation brake system according to one implementation of the present invention.

Figure 3: Shows the foundation brake system along with the automatic slack adjuster according to another Implementation of present invention.

It may be noted that the one or more elements may have been represented in the drawings by conventional symbols, and the drawings may show only those specific details that are pertinent to understanding of the embodiments of the present disclosure so as not to obscure the drawings with details that will be readily apparent to those of ordinary skilled in the art having benefit of the description herein.

DETAILED DESCRIPTION OF THE INVENTION
It should be understood at the outset that although illustrative implementations of the present disclosure are illustrated below, the present invention may be implemented using any number of techniques, whether currently known or in existence. The present disclosure should be in no way limited to illustrative implementations, drawings, and techniques, illustrated below, including the exemplary design and implementation illustrated and described herein, but may be modified within the scope of equivalents.

Unless otherwise defined, all terms and especially technical and/or scientific terms, used herein, may be taken to have the same meaning as commonly understood by one having an ordinarily skilled in the art. Reference is made herein to some “embodiments”. It should be understood that an embodiment is an example of a possible implementation of any features and/or elements presented in the foregoing claims. Some embodiments have been described for the purpose of illuminating one or more potential ways in which the specific features and/or elements of the foregoing claims fulfill the requirements of uniqueness, utility, and non-obviousness.

The terms and words used in the following description and claims are not limited to the bibliographical meanings, but, are merely used by the inventor to enable a clear and consistent understanding of the present disclosure. Accordingly, it should be apparent to those skilled in the art that the following description of various embodiments of the present disclosure is provided for illustration purpose only and not for the purpose of limiting the present disclosure as defined by the appended claims and their equivalents.

It is to be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, a reference to "a component surface" includes a reference to one or more of such surfaces.

All terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments belong. Further, the meaning of terms or words used in the specification and the claims should not be limited to the literal or commonly employed sense, but should be construed in accordance with the spirit of the disclosure to most properly describe the present disclosure.

The terminology used herein is for the purpose of describing particular various embodiments only and is not intended to be limiting of various embodiments. As used herein, the singular forms "a," "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising" used herein specify the presence of stated features, integers, steps, operations, members, components, and/or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, members, components, and/or groups thereof. Also, Expressions such as "at least one of," when preceding a list of elements, modify the entire list of elements and do not modify the individual elements of the list.

The present invention is directed to provide an automatic slack adjuster for air drum brake system which eliminates the need for the manual adjustments in the system. The invention simplifies the slack adjustment on the air drum system supporting the enhancement of safety on the vehicle and avoids the manual adjustments in the system. This is a new and unique slack adjuster developed and uses the basic concept of the manual slack adjuster for the fitment and uses the electrical motor with integrated Planetary reduction drive for Worm rotation.

The slack adjuster disclosed in the invention is driven using the electrical motor and adjusts the gaps on the basis of the physical clearance of liner and drum. Thus, it works like a fully automatic slack adjuster and hence would not need any manual intervention or the derivative clearance inputs for the adjustment.

The invention discloses the use of a sensor at brake liner tip towards the air drum at preset height on one end and other side with the electrical connection. The sensor will provide the input through electrical connection based on the liner wear out resulting in the electrical motor driving the Worm for adjustment at automatic slack adjuster.

In one implementation, reference is made to the figure 1, which illustrate a Slack adjuster housing (1) which houses the Worm wheel (4), worm (5) shaft (6) electrical motor (3) to support the activity. The Air chamber connection point (2) is part of the slack adjuster housing (1) to ensure the pressure input for the movement of the slack adjuster in the Air drum brake system of the vehicle. The worm wheel (4) facilitates the entry of the brake cam shaft (7) which is rotated by the worm (5) connected through the shaft (6) to the electrical motor (3). The electrical motor (3) can be either integrated or mounted on to the Slack adjuster Housing (1) through the assembly. The electrical motor (3) is connected to the electrical Power source and sensor through electrical connectors. The Shaft (6) construction can be made in Multiple options and in one of the concept mentioned here the shaft is part of the electrical motor one side and other portion of the Shaft is a guiding piece locating in the body of Slack adjuster. The Shaft (6) may have variety of splines for the positive engagement with worm (5).

In one implementation, reference is made to the figure 2, which illustrates a foundation brake system comprising of the Roller (14), Web and table assembly (13) friction material liner (12) and brake drum inner Surface (11). The sensor (15) indicates the proper position to maintain the gap between the liner (12) and the brake drum inner Surface (11) during the usage of the braking system (gap as per the requirement which is predetermined and on the bases of which the position of the sensor (15) is located on the mounting bracket (18)). The sensor is set to get the indication of the liner to ensure the proper position and maintaining the proper clearance between the liner (12) and the brake drum inner surface (11). Upon the wear of the liner (12) during the applications and usage the gap between the brake drum inner Surface (11) and the liner (12) is increased during which the sensor (15) provides the input for adjustment to the electrical motor (3) of the slack adjuster mentioned in Figure 1. The Sensor is connected through the electrical connections to the electrical motor The electrical connection can be either be directly connected to the electrical motor (3) and the power source or can be connected through the ECU or any program chip on the vehicle or independent programed electronic unit for better functioning of the electrical motor (3).

In one implementation, the system helps to set the gap based on the predetermined physical gap between the Brake drum inner surface (11) and the liner (12) of the brake system by Rotation of the cam shaft (7) through the worm wheel (4) using the electrical motor (3) driving shaft (6) and the Worm (5). The System ensures the automatic adjustment of the gap without needing any manual interventions or the derivative calculations or methods as the position of the sensor (15) is fixed and provides the indication or input for the adjustment of the gap through the input to the electrical motor (3).

This system demonstrates the robust system of adjustment of the gap based on the actual gap and need providing the better comfort for the vehicle driver and assurance of the brake clearance irrespective of the applications. The adjustment is done when there is no contact of liner (12) to the sensor (15) hence makes it safe as the adjustment happens during the non-application of the brake by the driver.

As an additional enhancement the liner replacement position can also be added either through addition of another sensor (15) to sense the liner replacement need or having a double position sensing for sensor (15) to get an indication of the liner (12) wear during the course of applications.

In another Implementation, reference is made to Figure 3, there will no physical sensor to check the position of the Brake Liner (12) and the clearance with respect to the Brake Drum (11). The Automatic Slack adjuster (1) is has an integrated electrical Motor with Integrated Planetary reduction to meet the expected capacity (3) to drive the Worm (5) which is mounted using the Shaft (6), which will rotate the Worm Wheel (4) resulting in the rotation of the Cam Shaft (7) in the foundation brake. The cam Shaft rotation will result in the movement of the Brake Shoe Assembly (13) thus adjusting the Brake liner (12). As per the predefined frequency, the electrical motor (3) will rotate to enable the Brake liner (12) reaching the hardpoint with the Brake Drum (11) inner surface. Upon reaching the hardpoint, the brake liner (12) will be driven back by the electrical motor (3) through the worm (5) ensuring the Specified gap between the Brake Drum inner surface (11) and the Brake Liner (12). In the process either an electronic programmed chip or the motor controller or the timer mechanism would be used which can detect the Brake Liner (12) contact with the Brake Drum (11) inner surface through various options. One of the options used for the Build is the electrical power flow to detect the stalling of the motor rotation. This ensures the considerations of the High points of the Brake Liner (12) as the reference for setting the clearance with respect to the Brake Drum (11) inner surface. This invention also eliminates the requirements of the pre-setting requirements of the Automatic slack adjuster (1) during the initial installation on the Brake system leading to self-setting and sensor less Automatic slack Adjuster with better controls and better performance.

Some of the non-limiting advantages of the present invention are as follows:
-It maintains predetermined clearance essential for effective braking performance.
-It eliminates the manual adjustments in the system.
-Increases the quality of the end-product in terms of user experience.
-Simple and robust structure.
-easy to manufacture.

Those skilled in the art will recognize other use cases, improvements, and modification to the embodiments of the present disclosure. All such improvements and other use-cases are considered within the scope of the concepts disclosed herein.
,CLAIMS:
1. An automatic slack adjuster device for air drum brake system, wherein said device comprising a housing comprising:
At least an electrical motor with integrated planetary reduction integrated in said housing;
At least a worm drive arrangement having a worm means meshing with a worm wheel, wherein said worm being driven by said electrical motor;
At least a rotating machine element to couple said electrical motor to said worm drive arrangement;
wherein said electrical motor enabled to drive said worm drive arrangement using said rotating machine element, resulting in rotation of at least a camshaft means, for adjusting at least a specified gap between at least a brake liner and a drum brake in said air drum brake system.

2. The slack adjuster device as claimed in the claim 1, wherein said rotating machine element is selected from at least a slack means.

3. The slack adjuster device as claimed in the claim 1, further comprise at least sensing means for sensing said brake liner wear out to generate signal for enabling said electrical motor driving said worm means.

4. The slack adjuster device as claimed in the claim 3, wherein said sensing means is selected from at least an electronic system or integrated timers or combinations thereof.

5. The slack adjuster device as claimed in the claim 4, wherein adjustment of said gap is done when said brake line is in no contact with said sensing means.

6. The slack adjuster device as claimed in the claim 1, wherein said housing comprising at least an air chamber connection point to ensure at least a pressure input for movement of said slack adjuster device into said air drum brake system.

7. The slack adjuster device as claimed in claim 1, wherein said specified gap between said brake liner and said drum brake inner surface achieved through an automated adjustment means of said brake liner contacting said brake drum inner surface to create a reference and thereby adjust back to create and maintain at least a predefined gap between said brake liner and the brake drum inner surface

8. An automatic slack adjuster device for air drum brake system, wherein said device comprising a housing comprising:
At least an electrical motor with integrated planetary reduction integrated in said housing;
At least a worm drive arrangement having a worm means meshing with a worm wheel, wherein said worm being driven by said electrical motor;
At least a rotating machine element to couple said electrical motor to said worm drive arrangement;
wherein said electrical motor enabled to drive said worm drive arrangement using said rotating machine element, resulting in rotation of at least a camshaft means, wherein said specified gap between said brake liner and said drum brake inner surface adjusted by enabling at least a brake liner contacting at least a brake drum inner surface to create a reference and thereby adjust back to create and maintain at least a predefined gap between said brake liner and said brake drum inner surface.

9. A method for ensuring a gap between a brake liner and a drum brake of an air drum brake system, wherein said method comprising:
receiving, by means of electrical motor, at least an electrical signal as an input from a sensing means;
driving, by means of said electrical motor, a worm means;
rotating, by said driven worm means, a worm wheel and thereby enabling rotation of rotation of a cam shaft for automated adjustment of gap between said brake liner contacting said brake drum;
wherein, said rotation of said cam shaft enable the Brake liner reaching a hardpoint with respect to the brake drum inner surface, wherein upon reaching the hardpoint, the brake liner driven back by said electrical motor through the worm means, thereby ensuring said gap between the brake drum inner surface and the brake liner.

10. An air drum brake system comprising:
a brake liner;
a drum brake;
characterized in that, said air drum brake system comprising:
an automatic slack adjuster device for adjusting a gap between said brake liner and said drum brake, wherein said device comprises:
an electrical motor with planetary gear reduction integrated in a housing;
a worm drive arrangement having a worm means meshing with a worm wheel, wherein said worm being driven by said electrical motor;
a rotating machine element;
wherein said electrical motor enabled to drive said worm drive arrangement using said rotating machine element, resulting in rotation of a camshaft means.