Product Info Power-Lock (Locking Device )
Power-Locks are friction type locking device for easy, strong and secure non-backlash connections of shafts and hubs.
As the locking is done by frictional force using the wedge effect, the shaft and hub can be locked simply by tightening the bolt, without the need for fixing with a key or set screw, and removal is easy.
The line-up of materials also includes steel, stainless steel and coated versions, which can be used in a variety of situations.
Contents
Locking Device Related information
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Selection
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Data
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Operation
Basic construction
・Double taper type (ex. ：AS Series )
・Single taper type (ex. ：KE Series )
Locking principle
・Double taper type
[Click to enlarge ]
The inner diameter of taper ring A and taper ring B has a tapered shape, and is in contact with the taper of the inner diameter of the outer race and inner race.
By tightening the locking bolts, the taper rings A / B approach each other and generate contact pressures P and P' on the inner race. The contact pressure of P and P' generates a frictional force that completely locks the hub and shaft.
・Single taper type
[Click to enlarge ]
The inner diameter of the outer ring and the outer diameter of the inner ring are tapered. By tightening the locking bolt, the outer ring moves while sliding on the tapered surface and the inner surface of the hub.
At this time, radial forces P and P' that press the shaft and the inner surface of the hub against each other are generated by the wedge effect. The force of P and P' generates a frictional force that strongly locks the hub and shaft.
Features
- ・The processing cost of the shaft and hub is low. (No keyway processing required. )
- ・Ideal for high-precision position control with no backlash.
- ・No worry about thiner or seizure shaft. (No worry about wear )
- ・Easy phase alignment and advantageous for positioning cams and gears.
- ・It is easy to assemble and disassemble, and does not require skill for work like shrink fitting.
- ・No need for retaining due to thrust load.
- ・There is no decrease in shaft strength due to the keyway.
- ・Rotational balance is better than key fastening.
Notes
・Power-Lock is available with or without self-centering function depending on the series.
See more about the self-centering function
The self-centering function refers to the function to suppress the runout of the hub when the shaft and hub are tightened.
In other words, it is a function of how much the axis can be brought to the center of the hub.
POWER-LOCK has a series with or without a self-centering function. For a series without a self-centering function, the hub must be provided with a guide part (a part where the shaft and hub come into direct contact).
Practical centering accuracy can be obtained if the guide length is expected to be half the shaft diameter.
・Hub moves during assembly without flange.
See the detailed explanation about hub movement during assembly
※Images of RE-SS series with and without flange (snap ring) are shown for reference.
In the series with a flange, the flange becomes a stopper when the locking bolt is tightened. Even if the hub comes close to the front together with the outer ring, it is stopped, and it slides on the outer ring and the inner surface of the hub.
However, because there is no stopper in straight mounting without a flange (figure at the top right), the hub will come close to the front together with the outer ring when the locking bolt is tightened. (However, as there is no loss due to sliding, the transmission torque increases.)
For applications where it is difficult for the hub to move, select a type that does not move the hub.
Product Lineup for Power-Lock
You can select the most suitable Power-Lock from a wide range of lineups according to the usage atmosphere.
Power-Lock that can be used in a variety of environments.
Stainless steel series suitable for applications where the product is exposed to direct water or high corrosion resistance is required, and electroless nickel plating series for simple rust prevention in clean rooms, etc. are available.
Stainless Steel Package
Suitable for applications where the product is exposed to direct water or high corrosion resistance is required. You can choose from three series according to your application.
Although the dimensions are compatible with the standard series, please note that the transmissible torque will be reduced.
Locking bolts are made of specially lubricated stainless steel, so no additional lubrication is necessary during assembly.
KE-SS Series
Model No. PL□□X□□KE-SS
KE series stainless steel specifications for small diameter shafts.
- ・The main unit is made of highly anticorrosive austenitestainless steel.
- ・Special lubrication coating is applied to the locking bolts, so no additional lubrication is necessary during assembly.
- ・Since it is designed to suppress the generated surface pressure while having a higher transmission torque than other companies' products, it can also be used for small diameter hubs. In addition, the number of locking bolts is also small, and the assembly man-hours can be reduced.
- ・As with the KE series, standard products can be used for plus tolerance shafts such as servo motors.
- ※Self-centering function available. No need for the hassle of machining on hubs for guide portions.
- ※No hub movement during assembling.
Taper specification
Single taper
Centering function
Provided
Applicable shaft diameter
Φ5～Φ50
Torque range
5.0～836N・m
Applicable tolerance
Shaft ：h6,h7,js6,js7,k6,m6
Hub hole ：H8
Applicable surface roughness
Ra1.6
AS-SS Series
Model No. PL□□X□□AS-SS
It is a stainless steel specification of the global standard model AS series.
- ・Suitable for use in adverse environments with corrosive atmosphere.
- ・The main unit is built with austenite stainless steel while the locking bolts (M12 or below) are made of specially lubricated stainless steel (SUH660). These materials minimize dust and maintain a constant friction coefficient and high efficiency.
- ・Due to the above, no additional lubrication is necessary during assembly.
- Installation time can be reduced.
- ※It does not have a self-centering function, so it is necessary to provide a guide part on the hub.
- ※No hub movement during assembling.
Taper specification
Double taper
Centering function
None
Applicable shaft diameter
Φ19～Φ150
Torque range
196～20900N・m
Applicable tolerance
Shaft ：h8 Hub hole ：H8
Applicable surface roughness
Ra1.6
RE-SS Series
Model No. PL□□X□□RE-SS
Stainless steel series with two types of mounting methods to choose.
- ・By installing or removing the snap ring, you can choose two ways of installing either flange or straight.
- ・The main unit is made of highly anticorrosive austenitestainless steel.
- ・Special lubrication coating is applied to the locking bolts, so no additional lubrication is necessary during assembly.
- ・Available from small shaft diameters. Provides more transmission torque than the KE-SS Series.
- ※Self-centering function available. No need for the hassle of machining on hubs for guide portions.
- ※For the flange type, there is no hub movement during assembly, but for the straight type, the hub moves slightly toward the front side in the axial direction during assembly. Please contact Tsubaki representatives for details.
Taper specification
Single taper
Centering function
Provided
Applicable shaft diameter
Φ5～Φ50
Torque range
5.01～1170N・m
Applicable tolerance
Shaft ：h8 Hub hole ：H8
Applicable surface roughness
Ra1.6
Electroless nickel plated
Suitable for relatively simple rust preventive applications such as use in clean rooms. Dimensionally interchangeable with standard series, no reduction in transmissible torque.
Locking bolts are made of specially lubricated stainless steel, so no additional lubrication is necessary during assembly.
You can choose from four series according to your application.
KE-KP Series
Model No. PL□□X□□KE-KP
Electroless nickel plating series of KE series for small diameter shaft.
- ・Dimensions and transmissible torque are the same as thestandard KE models. No torque reduction.
- ・The units are plated with peel-proof electroless nickel.
- ・The locking bolts have a special surface treatment with lubricating effect, so no additional lubrication is necessary during assembly.
The electroless nickel-plated models are chrome-free and environmentally friendly. - ※Please note that the applicable shaft tolerance is h8 and the hub bore tolerance is H8.
- ※Self-centering function available. No need for the hassle of machining on hubs for guide portions.
- ※No hub movement during assembling.
Taper specification
Single taper
Centering function
Provided
Applicable shaft diameter
Φ5～Φ100
Torque range
7.5～9900N・m
Applicable tolerance
Shaft ：h8 Hub hole ：H8
Applicable surface roughness
Ra1.6
AS-KP Series
Model No. PL□□X□□AS-KP
It is an electroless nickel plating specification of the global standard model AS series.
- ・The units are plated with peel-proof electroless nickel.
- ・The locking bolts have a special surface treatment with lubricating effect, so no additional lubrication is necessary during assembly.
The electroless nickel-plated models are chrome-free and environmentally friendly. - ・Same as standard specifications, fewer bolts compared to other company’s products, allowing reduced time and manpower for installation.
- ・The dimensions are the same as the AS series standard specifications, and replacement is easy.
- ※It does not have a self-centering function, so it is necessary to provide a guide part on the hub.
- ※No hub movement during assembling.
Taper specification
Double taper
Centering function
None
Applicable shaft diameter
Φ19～Φ300
Torque range
245～151000N・m
Applicable tolerance
Shaft ：h8 Hub hole ：H8
Applicable surface roughness
Ra1.6
TF-KP Series
Model No. PL□□X□□TF-KP
Electroless nickel plating specification of TF series for small diameter hub.
- ・Dimensions and transmissible torque are the same as the standard TF models. No torque reduction.
- ・Small inner and outer diameter ratios, available from Φ10, are ideal for small-diameter hubs as in the standard series.
- ・The units are plated with peel-proof electroless nickel.
- ・The locking bolts have a special surface treatment with lubricating effect, so no additional lubrication is necessary during assembly.
The electroless nickel-plated models are chrome-free and environmentally friendly. - ※Self-centering function available. No need for the hassle of machining on hubs for guide portions.
- ※No hub movement during assembling.
Taper specification
Single taper
Centering function
Provided
Applicable shaft diameter
Φ10～Φ90
Torque range
44～8820N・m
Applicable tolerance
Shaft ：h8 Hub hole ：H8
Applicable surface roughness
Ra1.6
AD-N-KP Series
Model No. PL□□X□□AD-N-KP
Electroless nickel-plating version of the large-capacity torque transmission AD-N Series.
- ・Mainly suitable for applications requiring large capacity torque, such as for fixing bogie wheel shafts in a clean room.
- ・Dimensions and transfer torque are the same as the standard AD-N series. No torque reduction.
- ・The units are plated with peel-proof electroless nickel.
- ・The locking bolts have a special surface treatment with lubricating effect, so no additional lubrication is necessary during assembly.
The electroless nickel-plated models are chrome-free and environmentally friendly. - ※Self-centering function available. No need for the hassle of machining on hubs for guide portions.
- ※No hub movement during assembling.
Taper specification
Double taper
Centering function
Provided
Applicable shaft diameter
Φ50～Φ100
Torque range
4210～26500N・m
Applicable tolerance
Shaft ：h8 Hub hole ：H8
Applicable surface roughness
Ra1.6
