Product Description

Product Description

• Solid Build: Exercise bike provides a stable, quiet and safe cycling. Equipped with thickened steel, triangular frame, belt driven system, is smoother than chain and can support to 270lbs. A good choice for home gym.
• Shock Absorption Design: Workout bike unique shock absorber spring design reduces the shock caused by mechanical movements to the body, maximizes the exercise effect and comfort level, provides a better support and protection to your spine, lumbar and thigh.

Product Parameters

CUSHION
Non-skid and comfortable

SAFE NON-SLIP FOOT
Effectively prevent the footfall in the movement of safety hazards.

SAFETY GIRDER BEARING
Thick main steel, real material, really rest assured riding.

BOLDED FRONT SUPPORT TUBE
Bolded front support pipe has better bearing and safety is guaranteed.

THICK LOAD BEARING PIPE
The vehicle is heavier, stronger, safer and guaranteed quality.

 

HORIZONTAL REGULATOR
Suitable for adjustment on uneven ground for horizontal effect.

WORKSHOP

Company Profile

ZheJiang Jolly Industrial Co Ltd is located in ZheJiang , China, where is with ports, airports and trains.

We specialized in the development, manufacture, marketing and after-sales service of all different kinds of sports goods and beauty products. Such as resistance band, compression socks, knee brace, dumbbell hand weights, yoga mat, rubber balls, treadmill, exercise bike, bicycle sport helmet, sports sunglasses, sports goggles, sports headband, wristband, waist brace, skate board etc and fashionable human hair wigs. Or, if you have an idea for a new product, we can have it made by a reputable manufacturer to your design.

Holding a trade license, and with much exporting experience for many years, we have exported many products to the American, European, Southeast Asian, the Middle Eastern, South American and African markets without any limits.

We adhere to the management principles of “quality first, customer first and credit-based” since the establishment of our company and always do our best to satisfy potential needs of our customers. Our company is sincerely willing to cooperate with enterprises from all over the world in order to realize a CZPT situation since the trend of economic globalization has developed.

FAQ

Q : Can I get free samples?
A: Yes, you can get free sample from our existing products.

Q: Can I get the sample designed by myself?
A: Of course, and we will return the sample fee back to you after mass production.

Q: Can I print our own logo and choose color?
A: Sure.

Q: What is your MOQ?
A: Usually our MOQ is 100 pcs for custom logo. But we accept lower quantity for your trial order.

Q: How much the transportation freight will be? 
A: The freight depends on the weight & packing size and your area.

Q: How to place the order?
A: Please tell us requirements you need, like color, quantity and if print logo on it ,then we will make the PI for you, after you get the PI you can pay for your order.
 
Q: What payment do you accept?
A: We can accept Paypal, Western Union and T/T etc. you can choose any 1 of them.
 
Q:What is the LEAD TIME of the goods?
A: Usually 2-3 days for sample or small orders,10-15 days for bulk orders. Depends on the requirements and your quantity.

Q:What is the shipping methods?
A:We usually ship the goods by DHL, FEDEX, UPS, Sea freight etc, also you can choose the other way that best for you.

Q:When will you ship out the item and can I have the tracking NO.?
A:The Item will be shipped within 2-3 working days upon payment received(Holidays excluded), and of course, tracking will be updated to you ASAP.

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.