Maintenance Info
  • 2021/08/10 8:00
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    2021/08/12 18:00
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Q&A   Linear Actuators

The following is a list of answers for frequently asked questions from our customers. Select questions to view the answers.

Linispeed Jack

Words

Q1What does low height design mean?
Q2Is the speed of 200mm/s faster than conventional Jacks?
Q3Why possible high-speed operation?
Q4Why the percent ED of Lini Speed Jack can be raised?
Q5Why is the service life of Lini Speed Jack longer?
Q6What's high function ball screw?
Q7Does conventional Jack have thrust limit?
Q8Why the no-load idling torque of Lini Speed Jack is large?
Q9Is synchronized operation possible?
Q10Does Lini Speed Jack have self-lock function?
Q11Why the bellow of Lini Speed Jack is MTO item?
Q12 Can an oil lubrication package be made upon request?
Q13Is grease lubrication gear type available?
Q14Is clean room specification available?
Q15How to read the percent ED chart for allowable load hourly rate?
Q16Is it possible to mount servo motor to flange ?
 Answers
Q1What does low height design mean?
A1

Conventional Jacks mount ball nut on the top of the worm wheel.
Lini Speed Jack incorporates it inside of the ball nut. The reduced dead space caused by ball nut contributes to the low height design,

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Q2Is the speed of 200mm/s faster than conventional Jacks?
A2

Conventional Jacks could only operate around maximum 125mm/s.
Also, the thrust falls down to half of the basic capacity when operating at the maximum speed. Consequently, the 5-ton frame of conventional Jack could only provide a rated thrust of 1.5 tons. Lini Speed Jack on the contrary, could keep the rated 5-ton thrust even operating at 200mm/s.

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Q3Why possible high-speed operation?
A3

Comparing with conventional Jacks, Lini Speed Jack enlarges the distance between cores.
By this means, when the screw lead and worm speed ratio remain same, the surface pressure received on the worm tooth plane under the same thrust ( input torque) can be reduced.
The reduced surface pressure helps to contain heat generation and enables high-speed operation within allowable thrust.

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Q4Why the percent ED of Lini Speed Jack can be raised?
A4

Same reason as the previous question, Lini Speed Jack has less heat generation and less downtime, contributing to higher percent ED.

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Q5Why is the service life of Lini Speed Jack longer?
A5

The ball screw used in Lini Speed Jack has higher function than those used in conventional Jacks.
Consequently, longer service life is made possible with the same screw diameter.
The service life of Lini Speed Jack 3-ton frame is 8 times of conventional 5-ton frame, and 2 times of conventional 10-ton frame.

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Q6What's high function ball screw?
A6

It's our company secret and we can't give details. We improved ball screw materials to enable more than 10 times longer expected travel distance than general ball screw.

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Q7Does conventional Jack have thrust limit?
A7

The output shaft allowable torque falls down as worm gear input speed goes up.
Consequently, the allowable thrust of worm Jack also deteriorates.
Lini Speed Jack does not have limit within the allowable thrust, because worm gear output shaft has a torque margin.

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Q8Why the no-load idling torque of Lini Speed Jack is large?
A8

There are two reasons. First, comparing with conventional Jacks, Lini Speed Jack enlarges the distance between worm cores, as a result, the resistance of both lubrication stirring and oil seal sliding gets bigger.
Second, it's due to the high-speed operation.
The vibration grows up when rotating at high speed.
The maximum rotating speed of Lini Speed Jack is premised on 3000r/min. The preload of input shaft bearing is raised to curb the vibration.

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Q9Is synchronized operation possible?
A9

The synchronized operation is possible by combined use with coupling and MD gear box.
However, when synchronizing Lini Speed Jacks serially, please consider the allowable input shaft torque to decide the number of synchronized units.

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Q10Does Lini Speed Jack have self-lock function?
A10

No, it doesn't.
Self-lock function is not possible with high efficiency screw and a reduction ratio between 1/6 to 1/8.
Please use brake motors.

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Q11Why the bellow of Lini Speed Jack is MTO item?
A11

Under high-speed operation, standard bellows may break as they are unable to cope with the air flow inside of Lini Speed Jack.
The MTO specially made bellow has air hole to let out the inside air fast.

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Q12 Can an oil lubrication package be made upon request?
A12

The oil lubrication of Lini Speed Jack gear is standard.
The lubrication of screw is grease.

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Q13Is grease lubrication gear type available?
A13

Yes, but it cannot be operated at maximum speed and allowable frequency given the degraded lubricating property.

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Q14Is clean room specification available?
A14

We can apply low-dust grease to screw shaft or offer raydent treatment, input shaft anti-rust coating.
However, in some cases, there are thrust limits.

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Q15How to read the percent ED chart for allowable load hourly rate?
A15

Choose the reference chart based on the model No. and ambient temperature.
Choose the corresponding graph by input rotating speed.
Calculate the percent ED for allowable load hourly rate from the intersection point of load and corresponding graph.

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Q16Is it possible to mount servo motor to flange ?
A16

It's possible for servo motor of size176, please consult us for detail.
For larger servo motors, it needs to be separately placed.

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