Lovejoy Grid Coupling Catalog

Ref: LoveJoy Grid Coupling Catalog

INFO

This is a sample catalog that shows how a traditional catalog can be presended with live calculations allowing readers to perform sizing and selection within the catalog directly.

Warnings

⚠️ WARNING

Failure to observe the following warnings could cause the power transmission product to break and parts to be thrown with sufficient force to cause serious injury or death.

Selection: Do not exceed catalog ratings. Refer to the Lovejoy catalog for proper selection, sizing, horsepower, torque range, and speed range of these products.

Installation: Proper maintenance, handling, and shop practices are critical. Follow all installation instructions included with the product and provided by your equipment manufacturer, and all applicable federal, state, and local regulations concerning the safe operation and maintenance of manufacturing equipment.

Operation: Avoid sudden shock loads during start up and operation. Do not operate a coupling assembly with improper alignment or bolt torque or with damaged or worn elastomeric elements. Inspect the assembly for these conditions shortly after initial operation and periodically thereafter.

Disclaimer

This catalog is provided solely to give you analysis tools and data to assist you in your product selection. Product performance is affected by many factors beyond the control of Lovejoy. Therefore, you must validate the suitability and feasibility of all product selections for your applications.

Selection Process

The following information is necessary when making a Grid coupling selection:

1. Description of motor or engine
   • Horse power (or KW)
   • RPM at slowest coupling speed while under load
2. Description of driven equipment
3. Shaft and keyway sizes
   • Type of fit for driver and driven equipment (clearance or interference)**
4. Shaft separation (BSE)
5. Physical space limitations
6. Environmental conditions

** Note: By default, sizes 1020 – 1090 will be clearance fit, sizes 1100 – 1200 will be interference fit.

Formulas Used To Calculate Torque:

Application Torque (in-lbs) = (horse power x 63025) / RPM
Application Torque (Nm) = (horse power x 9550) / RPM
Selection Torque = Application Torque x Service Factor

Application Service Factors Chart

ID	Industry	Application	Electric Motor	Recip 4/5 Cyl	Recip 6+ Cyl
1	Aggregate Processing, Cement, Mining Kilns	Dryer, Rotary, Hammermill	1.75	2.75	2.25
2	Aggregate Processing, Cement, Mining Kilns	Grizzly	2.00	3.00	2.50
3	Aggregate Processing, Cement, Mining Kilns	Crushers	2.50	*	*
4	Brewing and Distilling	Bottle/Can Filling	1.00	2.00	1.50
5	Brewing and Distilling	Cookers	1.25	2.25	1.75
6	Brewing and Distilling	Lauter Tub	1.50	2.50	2.00
7	Brewing and Distilling	Scale Hopper	1.75	2.75	2.25
8	Clay Working Industry	Brick Press, Machine	1.75	2.75	2.25
9	Dredges	Conveyors	1.25	2.25	1.75
10	Dredges	Maneuvering Winch	1.50	2.50	2.00
11	Dredges	Cable Reel, Screen Drive	1.75	2.75	2.25
12	Dredges	Cutter Head, Jig Drive	2.00	3.00	2.50
13	Food Industry	Bottling, Can Filling Machine	1.00	2.00	1.50
14	Food Industry	Cereal Cooker	1.25	2.25	1.75
15	Food Industry	Meat Grinder	1.75	2.75	2.25
16	Lumber	Rolls, Non-Reversing	1.25	2.25	1.75
17	Lumber	Band Resaw, Sorting Table	1.50	2.50	2.00
18	Lumber	Circular Resaw, Cut-off	1.75	2.75	2.25
19	Lumber	Edger, Head Rig, Hog	2.00	3.00	2.50
20	Lumber	Gang Saw (Reciprocating)	Refer To Lovejoy	Refer To Lovejoy	Refer To Lovejoy
21	Metal Rolling Mills¹	Soaking Pit Cover Drives	1.00	2.00	1.50
22	Metal Rolling Mills¹	Coilers (Cold Mills)	1.50	2.50	2.00
23	Metal Rolling Mills¹	Reel Drives, Steel Mill	1.75	2.75	2.25
24	Metal Rolling Mills¹	Hot Mills, Merchant Mills	Refer To Lovejoy	Refer To Lovejoy	Refer To Lovejoy
25	Oil Industry	Chiller	1.25	2.25	1.75
26	Oil Industry	Paraffin Filter Press	1.50	2.50	2.00
27	Oil Industry	Oilwell Pumping	2.00	3.00	2.50
28	Paper Mills	Bleachers, Stock Pumps	1.00	2.00	2.50
29	Paper Mills	Converting Machine	1.25	2.25	1.75
30	Paper Mills	Line Shaft, Rewinder	1.50	2.50	2.00
31	Paper Mills	Beater, Calender	1.75	2.75	2.25
32	Paper Mills	Barker Auxiliary	2.00	3.00	2.50
33	Paper Mills	Machined Spur Gear	2.50	*	*
34	Paper Mills	Cast Tooth Spur Gear	3.00	*	*
35	Rubber Industry	Tire/Tube Press	1.00	2.00	1.50
36	Rubber Industry	Extruder (5+ in Line)	1.75	2.75	2.25
37	Rubber Industry	Calender (3-4 in Line)	2.00	3.00	2.50

Notes:

¹ For high peak load applications, please refer to selection process on page GD-5

• Indicates that Lovejoy Application Engineering should be consulted with specific requirements ** Applications involving reciprocating engines and reciprocating driven devices are subject to critical rotational speeds which may damage the coupling and/or connected equipment.

Grid Coupling Performance Data

Standard Grid Style Couplings - Horizontal and Vertical Cover

Size	Nominal Torque	Maximum Speed	ID1 - ID2		SL²	T	Weight	Moment of Inertia
	in-lbs	Nm	Horizontal RPM	Min Bore	Max Bore	Set Screw	Solid	Solid Hubs
				in	mm	in	mm	in
1020	460	52	4,500	0.500	12	1.125	28	0.50
1030	1,320	149	4,500	0.500	12	1.375	35	0.31
1040	2,200	249	4,500	0.500	12	1.625	42	0.44
1050	3,850	435	4,500	0.500	12	1.875	48	0.62
1060	6,050	683	4,350	0.750	19	2.125	54	0.44

[Additional sizes continue...]

Grid Coupling Dimensional Data

Size	OAL	R	L	FL	G¹	LTB	OD	FD	HD
	in	mm	in	in	in	in	mm	in	mm
1020	3.88	98.5	1.88	2.62	0.96	0.38	0.118	3.00	1.87
1030	3.88	98.5	1.88	2.69	1.00	0.38	0.118	3.00	1.87
1040	4.12	104.7	2.00	2.75	1.03	0.38	0.118	3.00	2.00

Selection Example

Application Description

A company would like to use a grid coupling to connect a standard AC electric motor to a rotary lobe compressor. The specifications are:

• Electric motor: at
  

• Motor shaft (driver): with standard square key

• Compressor shaft (driven): with standard

• Both shafts are long

• Gap (BSE) between shaft ends:

The following steps provide an excellent selection process that will work for most standard grid coupling selections.

Step 1: Calculate Application Torque

Using the information provided by the customer: Application Torque

Step 2: Select Service Factor

From the chart on pages GD-7 and GD-8, find the application category 'Compressors', 'Rotary lobe and vane', under the column for 'Electric Motors',

Step 3: Calculate Selection Torque

Selection Torque:

Step 4: Initial Size Selection

Reference the Grid Coupling Performance Data on pages GD-10 and GD-11:

• First size that can accommodate 2,687 in-lbs: Size 1050 with nominal torque rating of 3,850 in-lbs
• However, 2-1/8 inch shaft exceeds maximum bore (1-7/8 inches) for size 1050
• Must step up to size 1060 to accommodate the 2-1/8 inch bore
• Horizontal cover acceptable as 1,760 RPM < maximum speed of 4,350 RPM

Step 5: Review Coupling Details

Compare all specifications for size 1060:

Parameter	1060 Coupling	Application	Acceptable?
Torque	6,050 in-lbs	2,687 in-lbs	yes
Bore Size	2-1/8" max	2-1/8"	yes
BSE	0.13"	1/8"	yes
Speed	4,350 RPM	1,760 RPM	yes
Mount length	5.13" OAL	6-1/8"	yes

Check the Grid Series Misalignment Chart to ensure the application meets the misalignment requirements.

Step 6: Select Part Numbers

From UPC Selection tables on Pages GD-16 through GD-19:

Component	Specification	Part Number
1060 Hub Bore 2-1/8"	see page GD-16	05491
1060 Hub Bore 48mm	see page GD-17	05815
1060 Horizontal Cover and Grid assembly with inch hardware	see page GD-18	05353

Note: Prefix all grid coupling part numbers with 697904

Overview

The Power of Torsional Dampening

Lovejoy's grid style coupling design has demonstrated its ability to dampen vibration by as much as 30% and can cushion shock loads that could cause damage to both the driving and driven equipment. The tapered grid spring design absorbs impact energy by spreading the energy out over the full length of the grid spring thus reducing the magnitude of the torque spikes.

Features

• High tensile, shot-peened alloy steel grid springs and precision machined hubs ensure superior coupling performance and long life
• Designed to be interchangeable with industry standard grid couplings
• Easy installation and maintenance reducing labor and downtime costs
• Torsional flexibility and resilience helps reduce vibration
• Cover fasteners available in Inch or Metric sizes
• Excellent for close coupled or spacer style arrangements
• Stock and custom spacer lengths available

Cover Styles

1. Horizontal Split Cover Design

   • Ideal for limited space
   • Easy access to grid spring
   • Well suited for reversing applications
   • Lightweight die-cast aluminum grid cover

2. Vertical Split Cover Design

   • Ideal for higher operating speeds
   • Easy access to grid spring
   • Cover manufactured from stamped steel for strength

3. Full Spacer Design – Horizontal Cover

   • Drop-out design ideal for pump applications and servicing
   • Stock sizes 1020 thru 1090
   • Lightweight die-cast aluminum grid cover

4. Half Spacer Design – Horizontal Cover

   • Offers additional BSE dimensions
   • Lightweight die-cast aluminum grid cover

Application Service Factors Chart

Application Service Factors Chart

ID	Industry	Application	Electric Motor	Recip 4/5 Cyl	Recip 6+ Cyl
1	Aggregate Processing, Cement, Mining Kilns	Dryer, Rotary, Hammermill	1.75	2.75	2.25
2	Aggregate Processing, Cement, Mining Kilns	Grizzly	2.00	3.00	2.50
3	Aggregate Processing, Cement, Mining Kilns	Crushers	2.50	*	*
4	Brewing and Distilling	Bottle/Can Filling	1.00	2.00	1.50
5	Brewing and Distilling	Cookers	1.25	2.25	1.75
6	Brewing and Distilling	Lauter Tub	1.50	2.50	2.00
7	Brewing and Distilling	Scale Hopper	1.75	2.75	2.25

[Additional tables follow similar format...]

Grid Coupling Selection Process

Required Information

1. Description of motor/engine
   • Horse power (or KW)
   • RPM at slowest coupling speed under load
2. Driven equipment description
3. Shaft and keyway sizes
4. Shaft separation (BSE)
5. Physical space limitations
6. Environmental conditions