Product Description

Product Description

Quick details

Gland ----High grade ductile iron

Tube  -----Cold drawn honed tubling

Piston-----High grade ductile iron

Piston rod----Chromed C45

Piston seal----Urethane seal

End cap----Casting seel

Mounting style----Pins and clips included

Gland seals----Polyurethane U-cup

Rod wiper----Urethane snap in

Paint color----Semi-gloss black, grey, red

1.Light-weight,high strength

   Base on the nature of construction work,the hydraulic cylinders need to suit for high strength,high

   using frequency,high fatigability.to promise the sability and reliablity of application.

2.the seal system

   select the excellent seal kits from japan and germany.adopt the advanced physical design,make

   sure the hydraulic cylinder get the best piston rod oil film

3.cylinder body

   adopt the good-quality alloy honed tube,though cold-drawing and rolling,to reach an excellent

   toughness and surface hardness.improve the wear-resistance.

4.piston rod

   middle frequency induction hardening and tempering,chrome plated on rod surface to improve the

   anti-rust ,wear-resistance and anti-scratch property.

5.safety/cushioning fuction

   The inside of cylinder set up an cushioning device in the end of stroke,it can absorb the juge inpact.

Technical Specification size.
 

cylinder diameter (mm)	piston rod diameter (mm)			max stroke (mm)
40	20	22	25	500
50	25	28	32	600
63	32	35	45	800
80	40	45	55	2000
90	45	50	63	2000
100	50	55	70	4000
110	55	63	80	4000
125	63	70	90	4000
140	70	80	100	4000
150	75	85	105	4000
160	80	90	110	4000
180	90	100	125	4000
200	100	110	140	4000
220	110	125	160	4000
250	125	140	180	4000

 Cylinder tube machining

  
  
  Piston 
  

Application boom cylider, stick cylinder, Dozer cylinder.
 

Excavator Type	Name	Stroke  (mm)	Installation Diameter(mm)	Cylinder Diameter(mm)	Rod Diameter(mm)
5.5T	Boom Cylinder	710	1120	115	65
	Stick Cylinder	815	1210	90	55
	Bucket Cylinder	605	945	85	55
	Dozer Cylinder	150	500	110	60
6.5T	Boom Cylinder	885	1311	110	65
	Stick Cylinder	900	1300	90	60
	Bucket Cylinder	730	1120	80	50
	Dozer Cylinder	145	565	130	70
11.5T	Left Boom Cylinder	980	1480	100	70
	Right Boom Cylinder	980	1480	100	70
	Stick Cylinder	1571	1530	115	80
	Bucket Cylinder	885	1375	95	65
18.5T	Left Boom Cylinder	1195	1790	120	85
	Right Boom Cylinder	1195	1790	120	85
	Stick Cylinder	1405	2000	130	95
	Bucket Cylinder	1110	1630	110	80
20T	Boom Cylinder	1285	1870	120	85
	Stick Cylinder	1490	2075	135	95
	Bucket Cylinder	1120	1680	115	80
23T	Boom Cylinder Assembly	1295	1870	130	90
	Stick Cylinder Assembly	1675	2225	140	100
	Bucket Cylinder Assembly	1156	1744	130	90
26T	Boom Cylinder Assembly	1420	1980	139	100
	Stick Cylinder Assembly	1748	2348	149	110
	Bucket Cylinder Assembly	1130	1753	134	100
40T	Boom Cylinder Assembly	1495	2135	160	110
	Stick Cylinder Assembly	1790	2480	170	110
	Bucket Cylinder Assembly	1285	1990	160	110

Q: Are you trading company or manufacturer ?

A: We are factory.

Q: How long is your delivery time?

A: Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity.

Q: Do you provide samples ? is it free or extra ?

A: Yes, we could offer the sample for free charge but do not pay the cost of freight.

Q: What is your terms of payment ?

A: Payment 30%TT in advance. 70% T/T before shippment

How to Determine the Quality of a Worm Shaft

There are many advantages of a worm shaft. It is easier to manufacture, as it does not require manual straightening. Among these benefits are ease of maintenance, reduced cost, and ease of installation. In addition, this type of shaft is much less prone to damage due to manual straightening. This article will discuss the different factors that determine the quality of a worm shaft. It also discusses the Dedendum, Root diameter, and Wear load capacity.

Root diameter

There are various options when choosing worm gearing. The selection depends on the transmission used and production possibilities. The basic profile parameters of worm gearing are described in the professional and firm literature and are used in geometry calculations. The selected variant is then transferred to the main calculation. However, you must take into account the strength parameters and the gear ratios for the calculation to be accurate. Here are some tips to choose the right worm gearing.
The root diameter of a worm gear is measured from the center of its pitch. Its pitch diameter is a standardized value that is determined from its pressure angle at the point of zero gearing correction. The worm gear pitch diameter is calculated by adding the worm's dimension to the nominal center distance. When defining the worm gear pitch, you have to keep in mind that the root diameter of the worm shaft must be smaller than the pitch diameter.
Worm gearing requires teeth to evenly distribute the wear. For this, the tooth side of the worm must be convex in the normal and centre-line sections. The shape of the teeth, referred to as the evolvent profile, resembles a helical gear. Usually, the root diameter of a worm gear is more than a quarter inch. However, a half-inch difference is acceptable.
Another way to calculate the gearing efficiency of a worm shaft is by looking at the worm's sacrificial wheel. A sacrificial wheel is softer than the worm, so most wear and tear will occur on the wheel. Oil analysis reports of worm gearing units almost always show a high copper and iron ratio, suggesting that the worm's gearing is ineffective.

Dedendum

The dedendum of a worm shaft refers to the radial length of its tooth. The pitch diameter and the minor diameter determine the dedendum. In an imperial system, the pitch diameter is referred to as the diametral pitch. Other parameters include the face width and fillet radius. Face width describes the width of the gear wheel without hub projections. Fillet radius measures the radius on the tip of the cutter and forms a trochoidal curve.
The diameter of a hub is measured at its outer diameter, and its projection is the distance the hub extends beyond the gear face. There are 2 types of addendum teeth, 1 with short-addendum teeth and the other with long-addendum teeth. The gears themselves have a keyway (a groove machined into the shaft and bore). A key is fitted into the keyway, which fits into the shaft.
Worm gears transmit motion from 2 shafts that are not parallel, and have a line-toothed design. The pitch circle has 2 or more arcs, and the worm and sprocket are supported by anti-friction roller bearings. Worm gears have high friction and wear on the tooth teeth and restraining surfaces. If you'd like to know more about worm gears, take a look at the definitions below.

CZPT's whirling process

Whirling process is a modern manufacturing method that is replacing thread milling and hobbing processes. It has been able to reduce manufacturing costs and lead times while producing precision gear worms. In addition, it has reduced the need for thread grinding and surface roughness. It also reduces thread rolling. Here's more on how CZPT whirling process works.
The whirling process on the worm shaft can be used for producing a variety of screw types and worms. They can produce screw shafts with outer diameters of up to 2.5 inches. Unlike other whirling processes, the worm shaft is sacrificial, and the process does not require machining. A vortex tube is used to deliver chilled compressed air to the cutting point. If needed, oil is also added to the mix.
Another method for hardening a worm shaft is called induction hardening. The process is a high-frequency electrical process that induces eddy currents in metallic objects. The higher the frequency, the more surface heat it generates. With induction heating, you can program the heating process to harden only specific areas of the worm shaft. The length of the worm shaft is usually shortened.
Worm gears offer numerous advantages over standard gear sets. If used correctly, they are reliable and highly efficient. By following proper setup guidelines and lubrication guidelines, worm gears can deliver the same reliable service as any other type of gear set. The article by Ray Thibault, a mechanical engineer at the University of Virginia, is an excellent guide to lubrication on worm gears.

Wear load capacity

The wear load capacity of a worm shaft is a key parameter when determining the efficiency of a gearbox. Worms can be made with different gear ratios, and the design of the worm shaft should reflect this. To determine the wear load capacity of a worm, you can check its geometry. Worms are usually made with teeth ranging from 1 to 4 and up to twelve. Choosing the right number of teeth depends on several factors, including the optimisation requirements, such as efficiency, weight, and centre-line distance.
Worm gear tooth forces increase with increased power density, causing the worm shaft to deflect more. This reduces its wear load capacity, lowers efficiency, and increases NVH behavior. Advances in lubricants and bronze materials, combined with better manufacturing quality, have enabled the continuous increase in power density. Those 3 factors combined will determine the wear load capacity of your worm gear. It is critical to consider all 3 factors before choosing the right gear tooth profile.
The minimum number of gear teeth in a gear depends on the pressure angle at zero gearing correction. The worm diameter d1 is arbitrary and depends on a known module value, mx or mn. Worms and gears with different ratios can be interchanged. An involute helicoid ensures proper contact and shape, and provides higher accuracy and life. The involute helicoid worm is also a key component of a gear.
Worm gears are a form of ancient gear. A cylindrical worm engages with a toothed wheel to reduce rotational speed. Worm gears are also used as prime movers. If you're looking for a gearbox, it may be a good option. If you're considering a worm gear, be sure to check its load capacity and lubrication requirements.

NVH behavior

The NVH behavior of a worm shaft is determined using the finite element method. The simulation parameters are defined using the finite element method and experimental worm shafts are compared to the simulation results. The results show that a large deviation exists between the simulated and experimental values. In addition, the bending stiffness of the worm shaft is highly dependent on the geometry of the worm gear toothings. Hence, an adequate design for a worm gear toothing can help reduce the NVH (noise-vibration) behavior of the worm shaft.
To calculate the worm shaft's NVH behavior, the main axes of moment of inertia are the diameter of the worm and the number of threads. This will influence the angle between the worm teeth and the effective distance of each tooth. The distance between the main axes of the worm shaft and the worm gear is the analytical equivalent bending diameter. The diameter of the worm gear is referred to as its effective diameter.
The increased power density of a worm gear results in increased forces acting on the corresponding worm gear tooth. This leads to a corresponding increase in deflection of the worm gear, which negatively affects its efficiency and wear load capacity. In addition, the increasing power density requires improved manufacturing quality. The continuous advancement in bronze materials and lubricants has also facilitated the continued increase in power density.
The toothing of the worm gears determines the worm shaft deflection. The bending stiffness of the worm gear toothing is also calculated by using a tooth-dependent bending stiffness. The deflection is then converted into a stiffness value by using the stiffness of the individual sections of the worm shaft. As shown in figure 5, a transverse section of a two-threaded worm is shown in the figure.