Introduction

Wiperdrive are prime Group of engineering industries, functioning more than two decades, catering the needs of almost major industries with their PRODUCT RANGE : FREEWHEEL (ONE WAY) CLUTCHES, KEYLESS TRANSMISSION ELEMENTS, TENSIONER NUTS, SPEED VARIATIORS, CAM FOLLOWERS (TRACK ROLL) ETC;

Keyless Transmission Elements :

Shrink fit connection of special variety. Versatile, high fatigue strength, even under alternating torsional stresses. Shaft/hub has no keyway, minimizing notch effect. Most suitable for shaft hub connection. Easy mounting and removal, wear free, perfect alignment, easily adjustable, economical.. shaft mounted gearing, gear wheels, chain sprockets, lever, cams, break drum and countless other application. Elements are available in modesl N7012, N7012.1, N7013.0, N7013.1, N7014, N7015, N7016, N8006, N250, N500 and Shrink Disc N4071, N4091 & split type NS4051, NS4071, NS4091.

(equiv.toRS/BI,CLS,FXM) are used as overrunning clutches, where the shaft overruns at high speeds. These units are having individually contact with outer ring. When the lift off speed is reached the sprags automatically disengage completely from the contact surface of the outer ring and rotate contact free. Hence sprags are wear free & having long life.

Tensioner Nuts :

Can be instead of standard hexagonal nuts on stud OR bolt for general mechanical connections-heavy Or medium duty. Bolt tension-clamping load-by tightening multi clamping screws with standard tool-torque wrench only.

Variable Speed Units :

Are compact in construction much useful and advantageous where infinitely variable speed drive is required. Speed variation by hand wheel / by other mechanism in lace of hand wheel / by other mechanism in place of hand wheel. Gives out put ratio 6:1 Input power 0.25 to 2.2K.W. Out put speed 1.5 to 1700 RPM.

Cam Followers / Stud Type Track Rollers / Track Rollers :

Are with standard as well as eccentric stud, cage guided ready to fit. These are equiv. To KR/CR/CF & are used for heavy loads and medium speeds.

WHY KEYLESS TRANSMISSION ELEMENTS

KEY TRANSMISSION :-

Though apparently seems simple but preparing keyway is one of the difficult maching operations-increase in cost due to various operation in involved – setting & down time + matching time + other such as :

• Lateral shifting of Keyways : in process it is extremely difficult to set the center line of the keyway exactly symmetrical and parallel with respect to the radial plane ;
• Heavy torsional stresses are concentrated at the corner of the keyway so shaft is weakened.
• Deviation in keyway width.
• Not parallel to the axis.
• Inaccuracy in Key.

The cumulative effect of the all above (operational) errors is really call for an alternative system-keyless Transmission.

NMTA KEYLESS TRANSMISSION ELEMENTS

Entirely eliminates the disadvantages of key transmission and conventional shrink connections and also involved calculations, extremely close matching tolerances - creating problems while fitting & removing parts and during repair work – adjustment, exchanging etc. It efficiently replaces, key & polygon connections, splined shafts etc.

NMT GROUP manufactures KEYLESS TRANSMISSION ELEMENTS which have varied and versatile application on almost all engineering fields. The elements have great absorbing capacity of kinetic energy by elastic radial deformation of tapered rings. The method is also very simple. By expansion of the outer & shrinkage of inner rings, frictional shaft & hub connections are established, which transmits highest torques free from backlash.

NMTA Transmission Elements are available in FOUR Types (1) Locking assemblies Models N7012.0, N7014, N7015.0, N7015.1, N7020, (2) taper Locking Elements Models N7013.0, N7013.1, N8006, N250 & N500 (3) Clamping Elements Models N5010, N5011,N5012 & N5013 (4) Shrink Disc Models N7012.1 N4051, N4071, N4091 & aplit type NS4051, NS4071 & NS4091.

ELEMENTS - SHRINK DISC
(is to be fitted on Hub) forming locking connection by tightening standard hex head screws provided with standard tools. The same transmissible torque value, almost can be achieved even when varying the nominal dimensions slightly when using the same clearances. After loosing the locking screws element is released and Hub can be moved along the shaft.

CHARACTERISTICS :
Elements are most suitable for securing all types of bosses and hubs on shafts and axles.

• No Keyway, No extra maching No notch effect.
• Perfect true running – absolutely no play.
• Easy adjustability / Easy exchangeability – Need nos tops.
• Easy mounting :- elements are tightened using standard screws and standard tools, Extra maching or fitting work is not required.
• Easy removal : - release screws saving much time, and the elements can be removed the step angle of the double tapers prevent self-locking and ensures the element can be released without difficulty.
• Freedom from wear - Having no moving parts.
• Overload protection effect – When the permissible load is exceeded, elements will slip. In this way, they cansafeguard valuable machine components against damage. However the slip causes fretting of the contact surfaces, so elements should not be used as slip clutch.
• Maintenance Friendly.

FEATURES :

N7012 – for highly stressed connections & wide machinery tolerances having range from 20 mm and above & torque from 270 Nm and above.

N7013 – for higher concentricity where required. Transmission torque limit is higher than N7012.

N7014 – similar to N7012 but higher torque limit than N7012 & N7013, range from shaft dia 60mm & above.

N7015-self centering but lower torque limit than N7014 range from shaft 90 mm & above.

N7016 – self centering used in conveyor drums.

N7020 – used as shaft coupling for rigid horizontal shaft connection for medium torque alignment.

N500 – used as shaft coupling for rigid horizontal shaft connection for medium torque transmission. N8006 - used where boss dia is limited. Range from shaft dia 5mm & above.

For lowest torque transmission.

N250 – used for self centering. Ranging from shaft 10 to 100 mm. Torque transmission from 48Nm to 15010Nm.

N4071 – Split type Standard mode, range from 20mm & above.

N4051-Light duty model Range from shaft dia 100mm & above.

N4091 – Heavy duty model Range from shaft dia 100mm & above.

NS4071 – Split type Standard model, Range from 20mm & above.

If higher functional value needed, it can be obtained by adding number of elements (i.e.1+1)

UNLIMITED APPLICATIONS

The elements are used for the connection of gearwheels, chain sprockets, levers, cams, cam plates, belt pulleys, brake drums, flywheels, couplings and clutches, shaft-mounted gearing, flanges, track wheels, impellers, etc. are giving every satisfaction in these and counless other application.