Product Description

>>GRANVILLE
 

>>The company adopts precision mechanical manufacturing technology, with high-quality special steel, high-precision grinding and dust-free assembly technology, specializing in the development and production of automotive hub bearings, hub units, hub flange, bearing maintenance kits and other bearing products.

>>Products are widely used in passenger vehicles, commercial vehicles and industrial machinery, in the international and domestic OEM/ODM/AS market has a good reputation.

>>Strictly in accordance with the standardized process, by professional technical personnel to ensure the stability of product quality. IATF16949, ISO9001 Certificated factory.
 

>>GIL WHEEL BEARING

>>ADVANTAGES
 

01 Material advantage:	All the material for Granville bearings (including inner/outer rings, rollers, balls, cages) are from the audited best suppliers in China.
02 Processing advantage:	Guarantee the time spent and quality of every processing. Can do 3times tempering to stabilize the dimensions of the bearings.
03 QC Advantage	All the bearing parts are 100% strictly inspected including crack detection, roughness, roundness, hardness and geometric dimensions.
04 Appearance Advantage	Provide light chamfer, black chamfer, black oil groove and hollow-end rollers.

>>FACTORY

The company has all kinds of CNC machine tools, processing centers, grinding production lines, ultrasonic cleaning lines and other equipment more than 100 sets, strictly in accordance with the standardized process, by professional technical personnel to ensure the stability of product quality.

The Granville manufacture takes her every effort in purchasing the most advanced bearing process equipment, automatic facilities are widely used in the factory and we are keep investing to improve more.

The company has side length instrument, profilometer, roundness instrument, stereoscope, hardness tester and other professional testing instruments to ensure the zero-defect delivery of products.
 

Bearing No.	dxDxBxC (mm)				Interchangeable	Bearing No.	dxDxBxC (mm)				Interchangeable
DAC25525716	25	52	20.6	20.6	617546A	DAC38740450	38	74.04	50	50	559912
DAC25520037	25	52	37	37	445539A	DAC39680037	39	68	37	37	311315DB
DAC27600050	27	60	50	50	513071	DAC39680637	39	68.06	37	37	311315BD
DAC3050571	30	50	20	20	DE0678CS12	DAC39720037	39	72	37	37	311396
DAC30540571	30	54	24	24	DE0681CS16	DAC39720637	39	72.06	37	37	542186CA
DAC3 0571 030/25	30	55	30	25	ATV-BB-2	DAC40720037	40	72	37	37	311443B
DAC30600337	30	60.03	37	37	633313C	DAC4072571	40	72.07	37	37	51004
DAC30640042	30	64	42	42		DAC40740036/34	40	74	36	34	DAC4074BW
DAC34620037	34	62	37	37	3 0571 4B	DAC40740540	40	74.05	40	40	DE08A27
DAC34640037	34	64	37	37	3 0571 6	DAC4571037	40	75	37	37	633966E
DAC34660037	34	66	37	37	636114A	DAC4571033/28	40	76	33	28	474743
DAC35640037	35	64	37	37	510014	DAC4571441/38	40	76.04	41	38	DE571
DAC35650035	35	65	35	35	443952EA	DAC408000302	40	80	30.2	30.2	440320H
DAC35660032	35	66	32	32	445980BA	DAC40800036/34	40	80	36	34	513036
DAC35660033	35	66	33	33	633676	DAC40820040	40	82	40	40
DAC35660037	35	66	37	37	311309	DAC40840338	40	84.571	38	38	IR-8638
DAC35680037	35	68	37	37	633295	DAC42750037	42	75	37	37	633457
DAC35685713/30	35	68.02	33	30	DAC3568W-6	DAC4275571	42	75.07	37	37	633791
DAC3572571	35	72	28	28	441832AB	DAC42760038/35	42	76	38	35	IR-8650
DAC35720034	35	72	34	34	B36	DAC42760039	42	76	39	39	513058
DAC35725713/31	35	72.02	33	31		DAC42760040/37	42	76	40	37	909042
DAC3572571	35	72.04	33	33	633669	DAC42800036/34	42	80	36	34	MV4280
DAC3572571	35	72.04	34	34		DAC42800045	42	80	45	45	DAC428045BW
DAC3672571	36	72.05	34	34	B32	DAC42820036	42	82	36	36	446047
DAC3676571/27	36	76	29	27	DE 0571	DAC42820037	42	82	37	37	311413A
DAC37720037	37	72	37	37	633541B	DAC42840036	42	84	36	36	444090
DAC3772571	37	72.04	37	37	633571	DAC42840039	42	84	39	39	440090
DAC37740045	37	74	45	45	35716AC	DAC42845716	42	84.02	36	36	444090AB
DAC3872571/33	37.99	72.04	36	33	51007	DAC45800045	45	80	45	45	564725AB
DAC38745716/33	37.99	74.02	36	33	DAC3874W	DAC45845719	45	84.02	39	39	513130
DAC38700038	38	70	38	38	510012	DAC45850041	45	85	41	41	580191
DAC38720440	38	72.04	40	40	DE571	DAC49880046	49	88	46	46
DAC38740036/33	38	74	36	33	514002	DAC50900034	50	90	34	34	633007C

>>OUR BRANDS

 

>>ADVANTAGE MANUFACTURING PROCESS AND QUALITY CONTROL
 

 

01 Heat Treatment 02 Centerless Grinding Machine 11200 (most advanced) 03 Automatic Production Lines for Raceway 04 Automatic Production Lines for Raceway 05 Ultrasonic Cleaning of Rings 06 Automatic Assembly 07 Ultrasonic Cleaning of Bearings 08 Automatic Greasing, Seals Pressing 09 Measurement of Bearing Vibration (Acceleration) 10 Measurement of Bearing Vibration (Speed) 11 Laser Marking 12 Automatic Packing

 >>WHEEL HUB BEARING UNITS

 

>>PACKAGE

>>PLEASE FEEL FREE TO CONTACT US

 

Worm Shafts and Gearboxes

If you have a gearbox, you may be wondering what the best Worm Shaft is for your application. There are several things to consider, including the Concave shape, Number of threads, and Lubrication. This article will explain each factor and help you choose the right Worm Shaft for your gearbox. There are many options available on the market, so don’t hesitate to shop around. If you are new to the world of gearboxes, read on to learn more about this popular type of gearbox.

Concave shape

The geometry of a worm gear varies considerably depending on its manufacturer and its intended use. Early worms had a basic profile that resembled a screw thread and could be chased on a lathe. Later, tools with a straight sided g-angle were developed to produce threads that were parallel to the worm’s axis. Grinding was also developed to improve the finish of worm threads and minimize distortions that occur with hardening.
To select a worm with the proper geometry, the diameter of the worm gear must be in the same unit as the worm’s shaft. Once the basic profile of the worm gear is determined, the worm gear teeth can be specified. The calculation also involves an angle for the worm shaft to prevent it from overheating. The angle of the worm shaft should be as close to the vertical axis as possible.
Double-enveloping worm gears, on the other hand, do not have a throat around the worm. They are helical gears with a straight worm shaft. Since the teeth of the worm are in contact with each other, they produce significant friction. Unlike double-enveloping worm gears, non-throated worm gears are more compact and can handle smaller loads. They are also easy to manufacture.
The worm gears of different manufacturers offer many advantages. For instance, worm gears are 1 of the most efficient ways to increase torque, while lower-quality materials like bronze are difficult to lubricate. Worm gears also have a low failure rate because they allow for considerable leeway in the design process. Despite the differences between the 2 standards, the overall performance of a worm gear system is the same.
The cone-shaped worm is another type. This is a technological scheme that combines a straight worm shaft with a concave arc. The concave arc is also a useful utility model. Worms with this shape have more than 3 contacts at the same time, which means they can reduce a large diameter without excessive wear. It is also a relatively low-cost model.

Thread pattern

A good worm gear requires a perfect thread pattern. There are a few key parameters that determine how good a thread pattern is. Firstly, the threading pattern must be ACME-threaded. If this is not possible, the thread must be made with straight sides. Then, the linear pitch of the “worm” must be the same as the circular pitch of the corresponding worm wheel. In simple terms, this means the pitch of the “worm” is the same as the circular pitch of the worm wheel. A quick-change gearbox is usually used with this type of worm gear. Alternatively, lead-screw change gears are used instead of a quick-change gear box. The pitch of a worm gear equals the helix angle of a screw.
A worm gear’s axial pitch must match the circular pitch of a gear with a higher axial pitch. The circular pitch is the distance between the points of teeth on the worm, while the axial pitch is the distance between the worm’s teeth. Another factor is the worm’s lead angle. The angle between the pitch cylinder and worm shaft is called its lead angle, and the higher the lead angle, the greater the efficiency of a gear.
Worm gear tooth geometry varies depending on the manufacturer and intended use. In early worms, threading resembled the thread on a screw, and was easily chased using a lathe. Later, grinding improved worm thread finishes and minimized distortions from hardening. As a result, today, most worm gears have a thread pattern corresponding to their size. When selecting a worm gear, make sure to check for the number of threads before purchasing it.
A worm gear’s threading is crucial in its operation. Worm teeth are typically cylindrical, and are arranged in a pattern similar to screw or nut threads. Worm teeth are often formed on an axis of perpendicular compared to their parallel counterparts. Because of this, they have greater torque than their spur gear counterparts. Moreover, the gearing has a low output speed and high torque.

Number of threads

Different types of worm gears use different numbers of threads on their planetary gears. A single threaded worm gear should not be used with a double-threaded worm. A single-threaded worm gear should be used with a single-threaded worm. Single-threaded worms are more effective for speed reduction than double-threaded ones.
The number of threads on a worm’s shaft is a ratio that compares the pitch diameter and number of teeth. In general, worms have 1,2,4 threads, but some have three, five, or six. Counting thread starts can help you determine the number of threads on a worm. A single-threaded worm has fewer threads than a multiple-threaded worm, but a multi-threaded worm will have more threads than a mono-threaded planetary gear.
To measure the number of threads on a worm shaft, a small fixture with 2 ground faces is used. The worm must be removed from its housing so that the finished thread area can be inspected. After identifying the number of threads, simple measurements of the worm’s outside diameter and thread depth are taken. Once the worm has been accounted for, a cast of the tooth space is made using epoxy material. The casting is moulded between the 2 tooth flanks. The V-block fixture rests against the outside diameter of the worm.
The circular pitch of a worm and its axial pitch must match the circular pitch of a larger gear. The axial pitch of a worm is the distance between the points of the teeth on a worm’s pitch diameter. The lead of a thread is the distance a thread travels in 1 revolution. The lead angle is the tangent to the helix of a thread on a cylinder.
The worm gear’s speed transmission ratio is based on the number of threads. A worm gear with a high ratio can be easily reduced in 1 step by using a set of worm gears. However, a multi-thread worm will have more than 2 threads. The worm gear is also more efficient than single-threaded gears. And a worm gear with a high ratio will allow the motor to be used in a variety of applications.

Lubrication

The lubrication of a worm gear is particularly challenging, due to its friction and high sliding contact force. Fortunately, there are several options for lubricants, such as compounded oils. Compounded oils are mineral-based lubricants formulated with 10 percent or more fatty acid, rust and oxidation inhibitors, and other additives. This combination results in improved lubricity, reduced friction, and lower sliding wear.
When choosing a lubricant for a worm shaft, make sure the product’s viscosity is right for the type of gearing used. A low viscosity will make the gearbox difficult to actuate and rotate. Worm gears also undergo a greater sliding motion than rolling motion, so grease must be able to migrate evenly throughout the gearbox. Repeated sliding motions will push the grease away from the contact zone.
Another consideration is the backlash of the gears. Worm gears have high gear ratios, sometimes 300:1. This is important for power applications, but is at the same time inefficient. Worm gears can generate heat during the sliding motion, so a high-quality lubricant is essential. This type of lubricant will reduce heat and ensure optimal performance. The following tips will help you choose the right lubricant for your worm gear.
In low-speed applications, a grease lubricant may be sufficient. In higher-speed applications, it’s best to apply a synthetic lubricant to prevent premature failure and tooth wear. In both cases, lubricant choice depends on the tangential and rotational speed. It is important to follow manufacturer’s guidelines regarding the choice of lubricant. But remember that lubricant choice is not an easy task.