CN109687637B - Linear actuator with position feedback function - Google Patents
Linear actuator with position feedback function Download PDFInfo
- Publication number
- CN109687637B CN109687637B CN201811491112.6A CN201811491112A CN109687637B CN 109687637 B CN109687637 B CN 109687637B CN 201811491112 A CN201811491112 A CN 201811491112A CN 109687637 B CN109687637 B CN 109687637B
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- Prior art keywords
- nut
- lead screw
- screw
- sensor
- linear actuator
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/06—Means for converting reciprocating motion into rotary motion or vice versa
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
- H02K11/21—Devices for sensing speed or position, or actuated thereby
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
Abstract
The invention belongs to the design technology of actuators, and relates to a linear actuator with a position feedback function. In current linear actuator, position feedback adopts linear displacement sensor mostly, adopts the mode that directly links, leads to linear actuator length to increase, and volume increase, weight increase. The invention provides a linear actuator with a position feedback function, wherein a lead screw and a lead screw nut are arranged in a shell, a sliding bearing is arranged at an opening of the shell, the lead screw is provided with a lead screw gear, a screw rod is also arranged in the shell and is provided with a lead screw gear meshed with the lead screw gear, an anti-backlash nut and a sensor nut which rotate synchronously are in threaded connection on the screw rod, a compression spring is arranged between the anti-backlash nut and the sensor nut, and an extension structure of the sensor nut is connected with a pull rod of a linear displacement sensor. By adopting a proportional feedback mode, the position of the actuator is accurately fed back, and the actuator is shortened, shortened and lightened.
Description
Technical Field
The invention belongs to the design technology of actuators, and relates to a linear actuator with a position feedback function.
Background
Linear actuators are widely used in many fields. In the existing linear actuator, a linear displacement sensor such as LVDT is mostly used for position feedback, and the linear displacement sensor adopts a direct connection mode, a pull rod of the linear displacement sensor is fixed on a screw nut, and a seat of the linear displacement sensor is installed in a shell of the actuator, as shown in fig. 1. The existing linear displacement sensors are long, and the length of the extended pull rod is generally 2.5-3 times of the measuring stroke. This results in an increase in length, volume and weight of the linear actuator for mounting the linear displacement sensor.
Disclosure of Invention
The purpose of the invention is: a linear actuator with a position feedback function is provided, which adopts a proportional feedback mode, accurately feeds back the position of the actuator and realizes the shortness and the light weight of the actuator.
The utility model provides a linear actuator with position feedback function, installs lead screw and screw nut in the casing, and slide bearing installs at the casing opening part, the lead screw has the lead screw gear, still installs the screw rod in this casing, and it has the screw gear with the lead screw gear meshing, and threaded connection has synchronous pivoted anti-backlash nut and sensor nut on the screw rod, has compression spring between the two, the extending structure and the linear displacement sensor pull rod of sensor nut are connected.
And the linear displacement sensor seat of the linear displacement sensor pull rod is arranged in the shell.
One end of the screw rod is inserted into the bearing seat, the other end of the screw rod is inserted into the shell, and the end part of the screw rod is supported by the bearing.
The sensor nut has a portion inserted into the anti-backlash nut, which are slidably coupled.
The tooth number of the lead screw gear is Z1, the tooth number of the lead screw gear is Z2, the pitch of the lead screw is M1, the pitch of the lead screw is M2, when the lead screw nut generates a displacement L, the displacement of the pull rod of the linear displacement sensor is H, then:
the invention has the advantages that: the linear actuator with the position feedback function is provided, a proportional feedback mode is adopted, the size of the adopted linear displacement sensor is greatly shortened while the position of the actuator is accurately fed back, the length of the actuator is greatly shortened, the size is reduced, the weight is reduced, and the shortness and the light weight of the actuator are realized.
Drawings
Fig. 1 is a schematic structural view of a prior art linear actuator.
FIG. 2 is a schematic structural diagram of a linear actuator with position feedback function according to the present invention.
FIG. 3 is a schematic view of the anti-backlash nut and sensor nut installation.
Detailed Description
The present invention is described in further detail below. Referring to fig. 1, the linear actuator with a position feedback function is composed of a compression nut 1, an angular contact ball bearing 2, a lead screw gear 3, a lead screw nut 4, a sliding bearing 5, a shell 6, a linear displacement sensor, an anti-backlash nut 11, a compression spring 10, a sensor nut 9, a screw 16, a bearing 13, a bearing seat 14 and an end cover 15. The screw rod is arranged on the bearing seat 14 by two angular contact ball bearings 2, the two angular contact ball bearings 2 are arranged back to back and are pressed by a compression nut 1; the screw nut 4 is partly mounted on the screw and the outer circle is mounted in a bore of the slide bearing 5 forming a sliding fit.
The screw 16 passes through two bearings 13, one end of the screw is arranged on the bearing block 14, and the other end of the screw is arranged on the shell 6; which has a screw gear 12 that meshes with the screw gear 3.
A clearance eliminating nut 11, a compression spring 10 and a sensor nut 9 are arranged on the thread part of the screw rod 16; the screw holes of the anti-backlash nut 11 and the sensor nut 9 are the same, the sensor nut 9 is arranged in the anti-backlash nut 11, and a boss on the sensor nut 9 is clamped in a groove of the anti-backlash nut 11, so that the sensor nut 9 and the anti-backlash nut 11 cannot rotate mutually; a compression spring 10 is mounted between the sensor nut 9 and the anti-backlash nut 11.
The linear displacement sensor is a finished product, a pull rod 8 of the linear displacement sensor is arranged on a boss of a sensor nut 9, and a seat 7 of the linear displacement sensor is arranged in a shell 6.
The working principle of the invention is as follows: when the motor or other power source drives the screw to rotate, the screw nut 4 makes linear motion under the action of the screw. Meanwhile, the screw gear 3 drives the screw gear 12 to transmit rotary motion to the screw 16, the screw 16 rotates to drive the assembly of the anti-backlash nut 11, the compression spring 10 and the sensor nut 9 to do linear motion, and the sensor nut 9 drives the linear displacement sensor pull rod 8 to extend out or retract in the linear displacement sensor seat 7 to obtain position feedback. The compression spring 10 is arranged between the anti-backlash nut 11 and the sensor nut 9, so that the anti-backlash nut 11 and the sensor nut 9 have the tendency of being separated along the axial direction, and the purpose of anti-backlash is achieved.
Assuming that the number of teeth of the gear on the screw is Z1, the number of teeth of the screw gear 12 is Z2, the pitch of the screw is M1, the pitch of the screw 16 is M2, the displacement of the screw nut 4 is L, and the displacement of the linear displacement sensor pull rod 8 is H, the relationship between the displacement L of the screw nut 4 and the displacement H of the linear displacement sensor pull rod 8 is:
in this embodiment, the number of teeth Z1 of the screw gear is the same as the number of teeth Z2 of the screw gear 12, the pitch M1 of the screw is 5, the pitch M2 of the screw 16 is 0.5, and the displacement H of the pull rod 8 of the linear displacement sensor is equal to
It can be seen from this embodiment that the displacement H of the pull rod 8 of the linear displacement sensor is one tenth of the displacement L of the lead screw nut 4, which greatly shortens the length dimension of the linear displacement sensor, and accordingly, the length dimension of the actuator is greatly reduced, and the purposes of shortening, shortening and lightening are achieved.
Claims (3)
1. The utility model provides a linear actuator with position feedback function installs lead screw and screw nut (4) in casing (6), and casing (6) opening part, its characterized in that are installed in slide bearing (5): the lead screw is provided with a lead screw gear (3), a screw (16) is further installed in the shell (6), the lead screw is provided with a lead screw gear (12) meshed with the lead screw gear (3), a backlash eliminating nut (11) and a sensor nut (9) which synchronously rotate are in threaded connection on the screw (16), a compression spring (10) is arranged between the lead screw and the sensor nut, the sensor nut (9) is provided with a part inserted into the backlash eliminating nut (11) and is in sliding connection with the backlash eliminating nut and the sensor nut, and an extending structure of the sensor nut (9) is connected with a pull rod (8) of the linear displacement sensor; and a linear displacement sensor seat (7) of the linear displacement sensor pull rod (8) is arranged in the shell (6).
2. The linear actuator of claim 1, wherein: one end of the screw rod (16) is inserted into the bearing seat (14), the other end of the screw rod is inserted into the shell (6), and the end part of the screw rod is supported by the bearing (13).
3. The linear actuator of any one of claims 1 to 2, wherein: the tooth number of lead screw gear (3) is Z1, and the tooth number of screw gear (12) is Z2, and the pitch of lead screw is M1, and the pitch of screw (16) is M2, and when lead screw nut (4) produced the displacement volume and is L, the displacement volume of linear displacement sensor pull rod (8) was H, then:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811491112.6A CN109687637B (en) | 2018-12-05 | 2018-12-05 | Linear actuator with position feedback function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811491112.6A CN109687637B (en) | 2018-12-05 | 2018-12-05 | Linear actuator with position feedback function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109687637A CN109687637A (en) | 2019-04-26 |
| CN109687637B true CN109687637B (en) | 2021-07-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811491112.6A Active CN109687637B (en) | 2018-12-05 | 2018-12-05 | Linear actuator with position feedback function |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111106710A (en) * | 2019-12-11 | 2020-05-05 | 兰州飞行控制有限责任公司 | Electric steering engine |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005025748B4 (en) * | 2005-06-02 | 2011-07-28 | Andreas Grasl | Electricoline drive with limit stop |
| CN201354307Y (en) * | 2009-02-06 | 2009-12-02 | 南京建工集团有限公司 | Rotary displacement checking device |
| CN103673898B (en) * | 2013-12-11 | 2016-05-11 | 昆明理工大学 | A kind of using method based on the rotary optical fiber Bragg raster large displacement sensor of gear |
| CN203871981U (en) * | 2014-05-14 | 2014-10-08 | 北京新兴东方航空装备股份有限公司 | Linear displacement type electric steering engine |
| CN206036160U (en) * | 2016-08-29 | 2017-03-22 | 常州市三协电机电器有限公司 | Screw thread interstitial structure is eliminated to lead screw motor |
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| CN109687637A (en) | 2019-04-26 |
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