Gearbox & Gear Parts #5217763

Sprockets

Renold offer a comprehensive range of transmission chain sprockets for British Standard chain up to two inch pitch, ensuring maximum working life and productivity for your application. Other sizes of sprocket, including those to American Standard dimensions, are available on request.

Special sprockets are also manufactured on request, in special materials or formats, normally to suit a specific applications in harsh or difficult drive situations, such as;
Sprockets incorporating shafts
Welded or detachable hubs
Shear pin devices fitted
Necklace sprockets made up of chain plates and individual tooth sections for turning large drums or tables.
Combination sprockets (two or more sprockets combined having different pitch sizes and numbers of teeth).
Sprockets in two or more sections, i.e. split sprockets or segmental sprockets.
Sprocket and Chain Compatibility

Most drives have an uneven number of pitches in the chain and by using a driver sprocket with an odd number of teeth, uniform wear distribution over both chain and sprocket teeth is ensured. Even numbers of teeth for both the driver and the driven sprockets can be used, but wear distribution on both the sprocket teeth and chain is poor.

Number of Teeth

The maximum number of teeth in any driven sprocket should not exceed 114. This limitation is due to the fact that for a given elongation of chain due to wear, the working pitch diameter of the chain on the sprocket increases in relation to the nominal pitch diameter, i.e. the chain assumes a higher position on the sprocket tooth. The allowable safe chain wear is considered to be in the order of 2% elongation over nominal length.
A simple formula for determining how much chain elongation a sprocket can accommodate is 200N expressed as a percentage where N is the number of teeth on the largest sprocket in the drive system. It is good practice to have the sum of teeth not less than 50 where both the driver and the driven sprockets are operated by the same chain, e.g. on a 1:1 ratio drive. Both sprockets should have 25 teeth each.

Helical Bevel Gears
Helical Bevel Gears
The following shows the Renold Gears range of helical bevel gears.
RP Series
In-line helical speed reducer and geared motor unit with ratios of up to 363:1 and 22kW capacity.

Designed to European standard - interchangeable without re-engineering
Foot and flange mounting - flexibility in applications
Wide power range - broad design choice
Standard Heavy Duty version - higher load characteristics
Single, double or triple reduction - wide ratio availability
Direct mounting of IEC and NEMA motors B14 & B5
RP Series Product Features
High tolerance, heavy duty bearings for trouble free operation and maximum load carrying capacity.
Hardened and profile ground helical gears for maximum power transmission, smooth operation and long life, with maximum efficiency
Heavy duty, high tensile steel output shaft for maximum load carrying capacity.
Plug in IEC and NEMA motor adaptors B14 and B5.
Motorised and speed reducer versions for all design options
Supplied with lubricant from the factory - maintenance free

jPM Series
Worm gear unit available with torque capacities of up to 520Nm (4kW motor) and with a standard gear ratio range of 5:1 to 70:1. Available as foot, flange and shaft mounted types.

Motorised and speed reducer types for all applications
Variable mounting options allow design flexibility
Unique Holroyd gear tooth profile for high efficiency and long life
High torque capacities, yet compact design
Wide ratio range gives speeds to match design demands
Long life synthetic lubricant factory filled
Optional case protection for use in hostile and arduous environments
Hollow output shaft option for direct shaft mounting
Plug-in and solid output shafts single and double extension
jPM Product Features
Heavy duty ball and taper roller bearings combining maximum load capacity with long life.
Unique Holroyd tooth form for maximum torque capacity and optimum efficiency.
One piece output sleeve with electron beam welded bronze wormwheel rim to ensure maximum strength under shock load conditions.
Accepts standard B5 and B14 motors via plug-in polymer bush for durability, quietness and strength.
Machined surfaces on all sides of gear case, plus detachable feet and B5 output flange for wide range of mounting options.
Close grain cast iron gear case for strength and absorption of vibration for quiet running.
Hollow output shaft with option of single or double extension plug-in or solid output shaft.

Helical Gears
Renold Gears manufacture high quality, high specification loose helical and spur gears using leading edge gear technology. Our dedicated gear manufacturing machine shop, provides the facilities necessary to manufacture either volume or single components for both precision and commercial sectors.
Our experienced Engineering Department can advise on all areas of gear design - gear blank materials, heat treatments, surface treatments and full gear tooth geometry. Using kissoft gear design software our engineering team are able to maximise gear performance and therefore provide a unique gear design and development service.
High accuracy finish hobbed or ground gear teeth
Helical Spur gears
Volume or small batch production
Custom tool profiles
Gear grinding up to 350mm diameter and gear face widths up to 160mm
Prototypes and master gears
Kissoft gear design software optimising gear performance

Commercial & High Precision
Renold manufactures worm gears using the 'Holroyd' tooth form which conforms to British standard 721. The leaving side contact pattern provides for a good oil entry which results in the following benefits:
Increased lubrication
Increased efficiencies
Smoother running
Renold worm gears are widely respected for performance and reliability in a wide variety of drives ranging from large steel mill screw down mechanisms to high precision dual lead machine tool and rotary positioning systems.
Unrivalled Accuracy
Although Renold produces worm gears to BS 721, for greater control of manufacturing tolerances we use DIN 3962 and DIN 3974 for specifying grades of quality. Manufacturing quality is backed up by the latest inspection techniques and for high precision gears sets we can supply, in graph format, results of pitch, profile and transmission variations over 360 degrees of the worm gear set.
Approvals
Renold Gears is BS EN ISO 9001:2008 approved. All products are designed and manufactured within this Quality Assurance system.
Applications
Mining, Coal cutting machines, axle drives, civil engineering, cranes, trucks, dumpers, steel plants, screwdowns, wire and tube drawing, automotive, oil pump, fuel injection, power, coal pulverisers, steam turbines, machine tools, indexing heads, rotary tables

Dual Lead Worm Gears
Renold DL Series Dual lead worm gears are constructed with two leads. One flank of the worm thread and its mating sides of the wheel teeth are manufactured with one lead, and the other flank and its mating wheel teeth to a slightly different lead.
As far as the worm is concerned this has the effect of producing a worm thread which increases in thickness from one end of the worm to the other.
If the worm is therefore moved in an axial direction when in mesh with the wormwheel, backlash between the pair can be adjusted to the required amount.
In practice, the gears are manufactured so that the initial backlash is achieved at a certain distance relative to the datum plane on the worm. The worm can then be adjusted from this point as and when necessary during the life of the gears.
The DL Series dual lead worm gear offers many advantages to the split worm gear design. It provides a kinematically correct gear, which can run in either direction of rotation, and on which the backlash is infinitely adjustable from an acceptable maximum to zero.
Precision dual lead backlash adjustable worm gears are widely used in rotary tables, cutter drives and machine tool positioning mechanisms.

Helical Worm Gear Drives
Renold offers a multiple input helical-worm-worm with hollow bore output for direct mount to the drive shaft or it can be supplied with an optional Renold Hi-Tec coupling. It can be direct mounted to multiple prime movers including AC, DC or air motors. The drives can be manufactured in a range of sizes to suit power stations from 200 to 1200 MW. Different torque requirements are dependant on the size of the power station.

Bevel Helical Gear Drives
Renold's bevel helical solution is a multi stage design with the option of a solid output shaft, either vertically up or down, and with provision for multiple inputs and integrated holdbacks. The drives include a self-contained lubrication system. They can be either gear pump or electric motor driven and can be supplied with separately mounted gear motors for barring. The main motor is driven by a fluid coupling for soft starts. The drives can be manufactured in a range of sizes to suit power stations from 200 to 1200 MW.