CN201860210U - Linear actuator - Google Patents
Linear actuator Download PDFInfo
- Publication number
- CN201860210U CN201860210U CN2010206076285U CN201020607628U CN201860210U CN 201860210 U CN201860210 U CN 201860210U CN 2010206076285 U CN2010206076285 U CN 2010206076285U CN 201020607628 U CN201020607628 U CN 201020607628U CN 201860210 U CN201860210 U CN 201860210U
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- screw
- screw mandrel
- rotor
- linear actuator
- flange
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Abstract
The utility model relates to a linear actuator, which aims at solving the problems that the actuator in the prior art needs to be guided by a guide block, an inertia force of a driving rod is increased, and the control precision is influenced. The linear actuator comprises an actuating motor, wherein one end of a rotor of the actuating motor is fixedly connected with a nut; and the nut is connected with a screw rod. As a screw nut is replaced by the nut, a guide structure is not used, the inertia of a moving body is reduced, the control precision is improved, and the manufacturing cost is lowered; meanwhile, a damping device is arranged at the top of the screw rod, therefore, the impact force of the screw rod on the actuating motor is reduced, the service life of the actuating motor is prolonged, and the movement of the actuator is more stable.
Description
Technical field
The utility model relates to field of motor manufacturing, and in particular, the utility model is a kind of linear actuator about servomotor.
Background technology
At present, can accurately drive object and carry out straight-line equipment numerous species is arranged, as the hydraulic test of servo valve control, linear electric motors etc.The advantage of the hydraulic test of servo valve control is that actuating force is big, and stable action, shortcoming are the equipment complexity, and investment is big.The advantage of linear electric motors is control precision height, invests for a short time, and shortcoming is that actuating force is little.
Patent Office of the People's Republic of China discloses a CN1558533A document on December 29th, 2004, name is called a kind of driving, transmission integrated rectilinear motion electromechanical actuator, this electromechanical actuator comprises motor, leading screw and hollow guide housings, one end of hollow guide housings and electric machine casing one end are connected as a single entity, rotor in the motor is a ducted body, the inner segment of leading screw is threaded onto in the feed screw nut by the screw pair activity, and pass in the ducted body that feed screw nut penetrates rotor, and feed screw nut is fixedly connected with the corresponding end face of rotor, the outer section of leading screw and on feed screw nut be positioned at the hollow guide housings, the outer section guide pad of going up an intrinsic diameter greater than the leading screw external diameter of leading screw, this guide pad or be spline structure, or be flat key structure, correspondingly one section inwall of the outer fragment position of the corresponding leading screw of hollow guide housings is provided with the keyway that matches with leading screw spline or flat key structure, and they are connected.The advantage of this actuator is that actuating force is big, and control is accurate, and shortcoming is a complex structure, has increased drive rod inertia force with the guide pad guiding, has influenced control precision; The spline structure of guide pad has also increased manufacture difficulty and manufacturing cost.
Summary of the invention
The utility model needs the guide pad guiding for solving the actuator that exists in the prior art, has increased drive rod inertia force, has influenced the problem of control precision, and a kind of linear actuator that does not need the guide pad guiding is provided.
The technical scheme that its technical problem that solves the utility model adopts is: the utility model comprises servomotor, and an end of the rotor of servomotor is fixedlyed connected with a screw, and screw connects screw mandrel.Screw links to each other with the rotor of servomotor, when driven by servomotor rotor and screw forward and reverse rotation, the screw mandrel that links to each other with screw carries out advancing of rectilinear direction and setback, because the amplification that screw and screw mandrel have power, thereby actuating force increases greatly, improved control precision simultaneously; Replace nut with screw, the main distinction is that the joint face of screw and screw mandrel is bigger, and screw itself just has the effect of the stable screw mandrel direction of motion; And the joint face of nut and screw mandrel is little, thereby needs guide pad to lead to stablize the direction of motion of screw mandrel; Owing to save guide block structure, reduced manufacturing cost, reduced movable body inertia, improved control precision.
As preferably, be provided with cavity in the rotor, an end of screw mandrel extend in the cavity.Cavity is set in rotor, and when screw mandrel retreated, an end of screw mandrel stretched in the cavity, and most of screw mandrel overlaps with cavity, has dwindled the volume of whole actuator.
As preferably, the end end that screw mandrel stretches in the cavity is provided with buffer unit.Because actuating force is big, when screw mandrel retreats into extreme position and servomotor outer casing end and collides, can produce certain impact, influence the stability of control system and the useful life of servomotor, in the end of screw mandrel buffer unit is set and reduce this impulsive force.
As preferably, buffer unit comprises flange, screw, spring leaf, flange is installed in the counterbore of screw mandrel end, screw passes flange, one end of screw stretches into the interior and screw mandrel flexible connection of counterbore of screw mandrel end, the other end of screw stretches out flange, and spring leaf is arranged between the counterbore end face of flange and screw mandrel end face.Flange plays fixing and guide effect, and when screw mandrel retreated into extreme position, an end of flange was run into the end face of rotor, and the energy storage of flange compression spring leaf reduces impulsive force, plays cushioning effect.
As preferably, on the end face of rotor, be provided with cavity.When screw mandrel retreated into extreme position, flange compression spring leaf stretched out screw, at rotor end-face cavity is set and can avoids screw and rotor end-face to collide.
As preferably, screw is the ball-screw screw, and screw mandrel is the ball-screw screw mandrel.With compare nut and being connected of screw mandrel, ball-screw has motion smoothing, advantage of high precision.
The beneficial effects of the utility model are: thus replace nut to save guide frame with screw, reduced movable body inertia, improved control precision, reduced manufacturing cost; In the screw mandrel end buffer unit is set, has reduced the impulsive force of screw mandrel, improved the useful life of servomotor and made the action of actuator more steady the servomotor shell.
Description of drawings
Fig. 1 is a kind of structural representation of the utility model linear actuator;
Fig. 2 is the I partial enlarged drawing among Fig. 1.
Among the figure: 1. shell, 2. rotor, 3. screw, 4. screw mandrel, 5. buffer unit, 6. cavity, 7. flange, 8. spring leaf, 9. screw, 10. servomotor.
Embodiment
Below by specific embodiment, and in conjunction with the accompanying drawings the technical solution of the utility model is described in further detail.
Embodiment:
A kind of linear actuator of present embodiment, referring to Fig. 1, comprise servomotor 10, screw 3, screw mandrel 4, the rotor 2 of servomotor 10 and screw 3 are fixedlyed connected by screw rod, rotor 2 is hollow, screw mandrel 4 can stretch into rotor inner hole and move back and forth, and an end relative with rotor 2 end faces at screw mandrel 4 is provided with buffer unit 5, establishes cavity 6 at the end face of rotor 2 relative screw mandrels 4.
Referring to Fig. 2, buffer unit 5 comprises flange 7, spring leaf 8, screw 9, flange 7 is installed in the counterbore of screw mandrel 4 ends, screw 9 passes flange 7, one end and screw mandrel 4 join, it is relative with stop device 6 on the shell 1 that one end stretches out flange 7, and spring leaf 8 is installed in the counterbore, is placed between flange 7 and the screw mandrel 4.
When servomotor 10 drove rotor 2 forward rotation, rotor 2 drove screw 3 and rotates, because screw 3 makes screw mandrel 4 move to the direction of stretching out shell 1 with being threaded of screw mandrel 4; Equally, when servomotor 10 drove rotor 2 backward rotation, screw mandrel 4 moved to the direction that stretches into rotor 2 endoporus; When screw mandrel 4 moves to when rotor 2 end faces, the end face of the flange in the buffer unit 5 and rotor 2 is collided, and flange 7 compresses spring leafs 8 energy storage, and screw 9 stretches in the cavity 6 on rotor 2 end faces.
Above embodiment is one of preferred plan of the present utility model, is not that the utility model is done any pro forma restriction, also has other variant and remodeling under the prerequisite that does not exceed the technical scheme that claim puts down in writing.
Claims (6)
1. a linear actuator comprises servomotor, it is characterized in that: an end of the rotor of described servomotor is fixedlyed connected with a screw, and described screw connects screw mandrel.
2. a kind of linear actuator according to claim 1 is characterized in that: be provided with cavity in the described rotor, an end of described screw mandrel extend in the described cavity.
3. a kind of linear actuator according to claim 2 is characterized in that: the end end that described screw mandrel stretches in the described cavity is provided with buffer unit.
4. a kind of linear actuator according to claim 3, it is characterized in that: described buffer unit comprises flange, screw, spring leaf, described flange is installed in the counterbore of described screw mandrel end, described screw passes described flange, interior and the described screw mandrel of counterbore that one end of described screw stretches into described screw mandrel end flexibly connects, the other end of described screw stretches out described flange, and described spring leaf is arranged between the counterbore end face of described flange and described screw mandrel end face.
5. a kind of linear actuator according to claim 3 is characterized in that: be provided with cavity on the end face of described rotor.
6. according to claim 1 or 2 or 3 or 4 or 5 described a kind of linear actuators, it is characterized in that: described screw is the ball-screw screw, and described screw mandrel is the ball-screw screw mandrel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206076285U CN201860210U (en) | 2010-11-16 | 2010-11-16 | Linear actuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206076285U CN201860210U (en) | 2010-11-16 | 2010-11-16 | Linear actuator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201860210U true CN201860210U (en) | 2011-06-08 |
Family
ID=44106009
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206076285U Expired - Lifetime CN201860210U (en) | 2010-11-16 | 2010-11-16 | Linear actuator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201860210U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108749801A (en) * | 2018-07-19 | 2018-11-06 | 宁波拓普智能刹车系统有限公司 | A kind of deceleration mechanism of integrated electrical control braking force aid system |
-
2010
- 2010-11-16 CN CN2010206076285U patent/CN201860210U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108749801A (en) * | 2018-07-19 | 2018-11-06 | 宁波拓普智能刹车系统有限公司 | A kind of deceleration mechanism of integrated electrical control braking force aid system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110608 |
|
| CX01 | Expiry of patent term |