China supplier Bush and Self-Lubricated Pfte Bushing with Hot selling

Product Description


Shaft sleeve refers to the sleeve on the propeller shaft or stern shaft. The bearing is a part which can fix and reduce the friction coefficient of load
during the mechanical transmission.

The same thing between the sleeve and the bearing is that both bear the load of the shaft.
The difference between the 2 is that the sleeve is of the overall structure, and the relative movement between the shaft and the sleeve is the
rotation; the bearing is split type, and the rotation is the relative movement of the inner and outer rings of the bearing. But in essence, the sleeve is actually a kind of sliding bearing.

The bearing bush is equivalent to the outer ring of the sliding bearing. The sleeve is integral and the relative shaft is moving. Some of the bearing shells are split and the relative shaft is rotating.

In LEGO mindstores and biotrans rosys series robot components, the shaft sleeve refers to the LEGO standard axle holder in silver gray, which is divided into 2 types: full shaft sleeve and 1 / 2 shaft sleeve.


Common fault causes

During the long-term operation of the sleeve, the surface of the journal is subjected to the extrusion pressure of the expanding sleeve and the combined mechanical force, which will cause permanent deformation, diameter or reduction of 0.1mm-0.3mm. The mechanical expansion and tightening force can not meet the required tightening force, and the clearance between the sleeve and the spindle appears, which causes the wear of the sleeve.

Latest repair methods

Because of the high value of components and the expensive traditional repair methods, with the development of advanced technologies such as polymer composites abroad, some repair methods with high speed and low cost are favored. This method is also introduced in China, and the mature material of youfushi blue 2211f is also introduced. The material has the comprehensive mechanical properties, excellent adhesion and temperature resistance and corrosion resistance which can not be compared with the traditional methods. The maximum compressive strength can reach 1200kg/cm2, and the adhesion (overlapping shear tensile test) is 225 kg/cm2 on the smooth steel surface. So it can be used for repairing the wear of large shaft sleeve. And the equipment does not need to be disassembled in a large range, which saves a lot of manpower and material resources for the enterprise.


Process analysis of parts

(1) Part material: 45 steel. The cutting and processing properties are good.

(2) The surface of parts: outer circle surface (Φ 50, 35, 33), inner surface (Φ 31.5, 20.5), type hole, 2 end surfaces, inner and outer step surfaces, inner and outer undercut grooves, internal and external chamfering.

(3) Main surface analysis: the Φ 20.5 inner hole is not only the supporting surface of other parts, but also the main reference plane of the part; the outer circle of Φ 50 and its step surface are also used to support other parts.

(4) Main technical conditions: the coaxiality of the outer circle of Φ 50 and the inner hole of Φ 20.5 is controlled within 0.03mm; the verticality of the step surface and the Φ 20.5 inner hole is controlled in mm; the dimension tolerance of the inner hole itself is mm; the roughness is Ra0.8 μ m; the hardness of the parts heat treatment is hrc50-55.

Part manufacturing process design

(1) Blank selection: according to the 45 steel part material, the production type is medium batch production, the diameter and dimension of parts are different, the parts are thin, low rigidity, easy to deformation, high machining accuracy requirements, parts need to be quenched and other factors, and the selection between the bar and die forging is made: die forging.

(2) Benchmark analysis: the main positioning datum shall be Φ 20.5 inner hole center

(3) Installation scheme: when machining large end and inner hole, 3 claw chuck can be directly used for clamping; for rough machining small end, reverse claw clamp can be used for large end, and for semi precision and finishing small end, mandrel shall be provided to locate axial clamping workpiece with Φ 20.5 hole. When machining the type hole, the inHangZhou head can be used to install, lift the spindle 90 ° and use the direct inHangZhou method to ensure the equal position of 3 × Φ 6 on the part circumference. The 4 screws through the holes at the big end are installed with special clamps: the large end face and Φ 20.5 hole are used as the main positioning reference, the type hole is anti rotation and the workpiece is clamped axially.

(4) Surface processing method of parts: Φ 20.5 inner hole, which adopts fine grinding to meet the requirements of precision and roughness; outer circle and its step surface are grinded; other rotating surfaces meet machining requirements by semi precision turning; and the type hole is on vertical milling.

(5) Heat treatment arrangement: because of the hard skin on the surface of die forging, the tool wear and passivation will be accelerated. In order to improve the machinability, the blank will be annealed after die forging to soften the hard skin; the parts The final treatment is quenching. Because of the small wall thickness of parts, it is easy to deform, and the machining accuracy of parts is high. In order to control the quenching deformation as much as possible, the quenching treatment is arranged after rough machining for pretreatment.


1. The surface of the appearance quality sample shall be free of bubbles, burr, deformation, uniform material and no irritating smell.

2. Dimensions

(1) The relevant dimensions shall be tested with vernier caliper in accordance with relevant technical and drawing requirements.

(2) After the shaft sleeve and the rotating shaft are matched, the rotor is vertical downward, and the sleeve will not slide freely under the action of

self weight.

3. Heat resistance and aging test

(1) After 125 ºC /1h ball pressure test, the indentation should be no more than 2mm, and no deformation was observed visually.

(2) After the sample was put into the oven for 120 ºC /96 hours, the shaft sleeve was visually free of embrittlement and deformation.

4. Combustion resistance test

The flame retardant grade is VW-1, and it should be extinguished within 15s after burning with alcohol lamp for 15s.

5. Packaging and marking

(1) The packaging shall be firm, reliable and safe, and ensure that the products are not damaged during transportation.

(2) The package shall be marked with supplier code and name, product name, product quantity, material code, quality inspection mark, production

date, etc. the identification shall be clear and accurate, and there shall be no mixed loading.

(3) In order to increase the traceability of the product, the production batch number should be marked at the conspicuous place of the outer

packaging. The supply batch number shall be indicated on the product inspection certificate or the original record of inspection (test).

6. Hazardous substance content (RoHS directive)

If used for RoHS directive models, the materials shall meet ROHS directive requirements.


1.     Reliable Quality Assurance System
2.     Cutting-Edge Computer-Controlled CNC Machines
3.     Bespoke Solutions from Highly Experienced Specialists 
4.     Customization and OEM Available for Specific Application
5.     Extensive Inventory of Spare Parts and Accessories
6.     Well-Developed Worldwide Marketing Network 
7.     Efficient After-Sale Service System

The 219 sets of advanced automatic production equipment provide guarantees for high product quality. The 167 engineers and technicians with senior professional titles can design and develop products to meet the exact demands of customers, and OEM customizations are also available with us. Our sound global service network can provide customers with timely after-sales technical services.

We are not just a manufacturer and supplier, but also an industry consultant. We work pro-actively with you to offer expert advice and product recommendations in order to end up with a most cost effective product available for your specific application. The clients we serve worldwide range from end users to distributors and OEMs. Our OEM replacements can be substituted wherever necessary and suitable for both repair and new assemblies.



The Different Types of Splines in a Splined Shaft

A splined shaft is a machine component with internal and external splines. The splines are formed in 4 different ways: Involute, Parallel, Serrated, and Ball. You can learn more about each type of spline in this article. When choosing a splined shaft, be sure to choose the right 1 for your application. Read on to learn about the different types of splines and how they affect the shaft’s performance.

Involute splines

Involute splines in a splined shaft are used to secure and extend mechanical assemblies. They are smooth, inwardly curving grooves that resist separation during operation. A shaft with involute splines is often longer than the shaft itself. This feature allows for more axial movement. This is beneficial for many applications, especially in a gearbox.
The involute spline is a shaped spline, similar to a parallel spline. It is angled and consists of teeth that create a spiral pattern that enables linear and rotatory motion. It is distinguished from other splines by the serrations on its flanks. It also has a flat top. It is a good option for couplers and other applications where angular movement is necessary.
Involute splines are also called involute teeth because of their shape. They are flat on the top and curved on the sides. These teeth can be either internal or external. As a result, involute splines provide greater surface contact, which helps reduce stress and fatigue. Regardless of the shape, involute splines are generally easy to machine and fit.
Involute splines are a type of splines that are used in splined shafts. These splines have different names, depending on their diameters. An example set of designations is for a 32-tooth male spline, a 2,500-tooth module, and a 30 degree pressure angle. An example of a female spline, a fillet root spline, is used to describe the diameter of the splined shaft.
The effective tooth thickness of splines is dependent on the number of keyways and the type of spline. Involute splines in splined shafts should be designed to engage 25 to 50 percent of the spline teeth during the coupling. Involute splines should be able to withstand the load without cracking.

Parallel splines

Parallel splines are formed on a splined shaft by putting 1 or more teeth into another. The male spline is positioned at the center of the female spline. The teeth of the male spline are also parallel to the shaft axis, but a common misalignment causes the splines to roll and tilt. This is common in many industrial applications, and there are a number of ways to improve the performance of splines.
Typically, parallel splines are used to reduce friction in a rotating part. The splines on a splined shaft are narrower on the end face than the interior, which makes them more prone to wear. This type of spline is used in a variety of industries, such as machinery, and it also allows for greater efficiency when transmitting torque.
Involute splines on a splined shaft are the most common. They have equally spaced teeth, and are therefore less likely to crack due to fatigue. They also tend to be easy to cut and fit. However, they are not the best type of spline. It is important to understand the difference between parallel and involute splines before deciding on which spline to use.
The difference between splined and involute splines is the size of the grooves. Involute splines are generally larger than parallel splines. These types of splines provide more torque to the gear teeth and reduce stress during operation. They are also more durable and have a longer life span. And because they are used on farm machinery, they are essential in this type of application.

Serrated splines

A Serrated Splined Shaft has several advantages. This type of shaft is highly adjustable. Its large number of teeth allows large torques, and its shorter tooth width allows for greater adjustment. These features make this type of shaft an ideal choice for applications where accuracy is critical. Listed below are some of the benefits of this type of shaft. These benefits are just a few of the advantages. Learn more about this type of shaft.
The process of hobbing is inexpensive and highly accurate. It is useful for external spline shafts, but is not suitable for internal splines. This type of process forms synchronized shapes on the shaft, reducing the manufacturing cycle and stabilizing the relative phase between spline and thread. It uses a grinding wheel to shape the shaft. CZPT Manufacturing has a large inventory of Serrated Splined Shafts.
The teeth of a Serrated Splined Shaft are designed to engage with the hub over the entire circumference of the shaft. The teeth of the shaft are spaced uniformly around the spline, creating a multiple-tooth point of contact over the entire length of the shaft. The results of these analyses are usually satisfactory. But there are some limitations. To begin with, the splines of the Serrated Splined Shaft should be chosen carefully. If the application requires large-scale analysis, it may be necessary to modify the design.
The splines of the Serrated Splined Shaft are also used for other purposes. They can be used to transmit torque to another device. They also act as an anti-rotational device and function as a linear guide. Both the design and the type of splines determine the function of the Splined Shaft. In the automobile industry, they are used in vehicles, aerospace, earth-moving machinery, and many other industries.

Ball splines

The invention relates to a ball-spinned shaft. The shaft comprises a plurality of balls that are arranged in a series and are operatively coupled to a load path section. The balls are capable of rolling endlessly along the path. This invention also relates to a ball bearing. Here, a ball bearing is 1 of the many types of gears. The following discussion describes the features of a ball bearing.
A ball-splined shaft assembly comprises a shaft with at least 1 ball-spline groove and a plurality of circumferential step grooves. The shaft is held in a first holding means that extends longitudinally and is rotatably held by a second holding means. Both the shaft and the first holding means are driven relative to 1 another by a first driving means. It is possible to manufacture a ball-splined shaft in a variety of ways.
A ball-splined shaft features a nut with recirculating balls. The ball-splined nut rides in these grooves to provide linear motion while preventing rotation. A splined shaft with a nut that has recirculating balls can also provide rotary motion. A ball splined shaft also has higher load capacities than a ball bushing. For these reasons, ball splines are an excellent choice for many applications.
In this invention, a pair of ball-spinned shafts are housed in a box under a carrier device 40. Each of the 2 shafts extends along a longitudinal line of arm 50. One end of each shaft is supported rotatably by a slide block 56. The slide block also has a support arm 58 that supports the center arm 50 in a cantilever fashion.

Sector no-go gage

A no-go gauge is a tool that checks the splined shaft for oversize. It is an effective way to determine the oversize condition of a splined shaft without removing the shaft. It measures external splines and serrations. The no-go gage is available in sizes ranging from 19mm to 130mm with a 25mm profile length.
The sector no-go gage has 2 groups of diametrally opposed teeth. The space between them is manufactured to a maximum space width and the tooth thickness must be within a predetermined tolerance. This gage would be out of tolerance if the splines were measured with a pin. The dimensions of this splined shaft can be found in the respective ANSI or DIN standards.
The go-no-go gage is useful for final inspection of thread pitch diameter. It is also useful for splined shafts and threaded nuts. The thread of a screw must match the contour of the go-no-go gage head to avoid a no-go condition. There is no substitute for a quality machine. It is an essential tool for any splined shaft and fastener manufacturer.
The NO-GO gage can detect changes in tooth thickness. It can be calibrated under ISO17025 standards and has many advantages over a non-go gage. It also gives a visual reference of the thickness of a splined shaft. When the teeth match, the shaft is considered ready for installation. It is a critical process. In some cases, it is impossible to determine the precise length of the shaft spline.
The 45-degree pressure angle is most commonly used for axles and torque-delivering members. This pressure angle is the most economical in terms of tool life, but the splines will not roll neatly like a 30 degree angle. The 45-degree spline is more likely to fall off larger than the other two. Oftentimes, it will also have a crowned look. The 37.5 degree pressure angle is a compromise between the other 2 pressure angles. It is often used when the splined shaft material is harder than usual.

China supplier Bush and Self-Lubricated Pfte Bushing     with Hot sellingChina supplier Bush and Self-Lubricated Pfte Bushing     with Hot selling