阅读说明：本技术 一种单向驱动的线性致动器 (One-way driving linear actuator ) 是由 许欣 赵新星 于 2020-06-09 设计创作，主要内容包括：本发明公开了一种单向驱动的线性致动器,属于线性传动技术领域,包括驱动电机、传动组件、转动丝杆和传动螺母、内管和外管,所述驱动电机通过传动组件驱动转动丝杆转动,转动丝杆转动带动传动螺母沿转动丝杆轴向移动,传动螺母带动所述内管相对于外管移动,所述传动螺母上设有连接套,所述连接套与传动螺母轴向固定,所述连接套与所述内管分离,所述转动丝杆正向转动时,所述连接套的端部与内管的端部相抵,以驱动所述内管相对于外管伸出。本发明的优点在于使得线性致动器只具备单向推动,具有较好的安全性,同时结构上相对简单,更加节省成本。(The invention discloses a linear actuator driven in one direction, which belongs to the technical field of linear transmission and comprises a driving motor, a transmission assembly, a rotating lead screw, a transmission nut, an inner pipe and an outer pipe, wherein the driving motor drives the rotating lead screw to rotate through the transmission assembly, the rotating lead screw rotates to drive the transmission nut to axially move along the rotating lead screw, the transmission nut drives the inner pipe to move relative to the outer pipe, the transmission nut is provided with a connecting sleeve, the connecting sleeve and the transmission nut are axially fixed, the connecting sleeve is separated from the inner pipe, and when the rotating lead screw rotates in the forward direction, the end part of the connecting sleeve is abutted against the end part of the inner pipe so as to drive the inner pipe to extend. The linear actuator has the advantages that the linear actuator only has one-way pushing, the safety is better, the structure is relatively simple, and the cost is saved.)

1. The utility model provides an one-way driven linear actuator, includes driving motor, transmission assembly, rotates lead screw and drive nut, inner tube and outer tube, driving motor rotates the lead screw through the transmission assembly drive and rotates, rotates the lead screw and rotates and drive nut along rotating lead screw axial displacement, and drive nut drives the inner tube removes for the outer tube, a serial communication port, the last adapter sleeve that is equipped with of drive nut, adapter sleeve and drive nut axial fixity, the adapter sleeve with the inner tube separation, when rotating the lead screw forward rotation, the tip of adapter sleeve offsets with the tip of inner tube, with the drive the inner tube stretches out for the outer tube.

2. The linear actuator of claim 1, wherein the transmission nut has an external thread, the connection sleeve has an internal thread matching the external thread, and the transmission nut and the connection sleeve are fixed by a threaded connection.

3. A unidirectional linear actuator as claimed in claim 1, wherein the inner tube has an annular groove, a guide ring is disposed in the annular groove, the guide ring has at least one guide protrusion, and the inner wall of the outer tube has a guide groove matching the guide protrusion.

4. A uni-directionally driven linear actuator as claimed in claim 1 wherein the outer diameter of the connecting sleeve and the outer diameter of the inner tube are maintained to be the same.

5. A unidirectional linear actuator as claimed in claim 1 wherein the transmission assembly comprises a transmission worm and a transmission worm gear, the transmission worm is connected with the drive motor, the transmission worm gear is sleeved outside the rotary screw rod, and a clutch device is arranged between the transmission worm gear and the rotary screw rod.

6. A single direction drive linear actuator as set forth in claim 5 wherein said clutch means includes a coupling gear sleeve and a return spring, said coupling gear sleeve being mounted on and axially movable relative to the rotary screw, said coupling gear sleeve being drivingly connected to the drive worm gear.

7. The unidirectional linear actuator of claim 5, further comprising a housing and a pull release assembly mounted to the housing, the housing rotatably mounting a rocker, the pull release assembly comprising a pull rod axially movably disposed relative to a rotating lead screw, the rocker coupled to the pull rod, wherein when the pull rod is pulled, the rocker swings to axially push the clutch mechanism.

8. A unidirectional linear actuator as claimed in claim 5, wherein the linear actuator further comprises a first friction sleeve and a second friction sleeve sleeved on the rotary screw, the first friction sleeve and the second friction sleeve axially abut against each other, a self-locking torsion spring is sleeved outside the first friction sleeve, a release torsion spring is sleeved on the second friction sleeve, when the rotary screw is subjected to an axial load, the rotary screw transmits the axial force to the housing through the first friction sleeve and the second friction sleeve, and the axial force is not transmitted between the coupling gear sleeve and the first friction sleeve and the second friction sleeve in the axial direction.

9. A single direction drive linear actuator as set forth in claim 8 wherein said first friction sleeve is disposed at an end of said rotary feed screw, and said housing includes a tail pull at the end, said tail pull being axially restrained from said second friction sleeve.

10. A single direction drive linear actuator as claimed in claim 8 further comprising a push block, wherein said push block has a guide surface, said release torsion spring includes a radially extending pin, said housing has a pull rod movably disposed in an axial direction with respect to said rotating lead screw, said pull rod is connected to said push block to pull said pull rod, and said guide surface on said push block abuts said pin to expand said release torsion spring.

[ technical field ] A method for producing a semiconductor device

The invention relates to a linear actuator driven in one direction, and belongs to the technical field of linear transmission.

[ background of the invention ]

The linear actuator, also called electric push rod, is widely used in the fields of furniture, medical equipment, solar power generation and the like, and the main structure of the linear actuator comprises a driving motor, a transmission worm, a worm wheel, a screw rod and a nut.

Traditional linear actuator stretches out and retracts and is driven by driving motor, but this kind of drive mode for when driving motor reversal drove the inner tube and withdraw, touch the foreign matter and can not stop, cause article damage or human damage very easily, especially to the heavier infant of curiosity, like to seek with the hand touch, very easily is hindered by the clamp, and the danger degree is high, and the security performance is low. It is also necessary to develop such a linear actuator for preventing hands from being pinched, so that linear actuators which can only be driven in one direction are also beginning to appear on the market, but such linear actuators are generally complicated in structure.

[ summary of the invention ]

The invention aims to overcome the defects of the prior art and provide a linear actuator driven in a single direction, so that the linear actuator only has single-direction pushing, has better safety, is relatively simple in structure and saves more cost.

The technical scheme adopted by the invention is as follows:

the utility model provides an one-way driven linear actuator, includes driving motor, transmission assembly, rotates lead screw and drive nut, inner tube and outer tube, driving motor rotates the lead screw through the transmission assembly drive and rotates, rotates the lead screw and rotates and drive nut along rotating lead screw axial displacement, and drive nut drives the inner tube removes for the outer tube, the last adapter sleeve that is equipped with of drive nut, adapter sleeve and drive nut axial fixity, the adapter sleeve with the inner tube separation, when rotating the lead screw forward and rotating, the tip of adapter sleeve offsets with the tip of inner tube, with the drive the inner tube stretches out for the outer tube.

The invention has the following beneficial effects:

according to the linear actuator, the connecting sleeve is arranged on the transmission nut, the connecting sleeve and the transmission nut are relatively fixed in the axial direction, but the connecting sleeve and the inner pipe are separated from each other and do not generate a connection relation, when the rotating screw rod rotates in the forward direction, the end part of the connecting sleeve can abut against the end part of the inner pipe, so that the connecting sleeve generates axial thrust on the inner pipe, namely when the rotating screw rod rotates in the forward direction, the transmission nut can normally push the inner pipe to extend out, and when the rotating screw rod rotates in the reverse direction, the transmission nut drives the connecting sleeve to retract, but because the connecting sleeve and the inner pipe are separated, the inner pipe cannot retract along with the connecting sleeve, so that the hand clamping condition can be reduced, and the safety is improved.

In addition, in the invention, the connecting sleeve is arranged on the transmission nut, because the transmission nut is usually made of an injection molding product or a non-wear-resistant material, if the transmission nut is abutted and pushed against the inner pipe, obviously, the transmission nut is greatly damaged, so that the connecting sleeve is independently designed, the interaction force generated with the inner pipe is mainly borne on the connecting sleeve, the connecting sleeve can be made of a material with higher strength, such as metal, such as alloy, and certainly, the connecting sleeve can also be made of plastic with better strength, the requirements on the strength and the precision of the transmission nut do not need to be changed, the cost is better controlled, and the assembly is relatively convenient.

Preferably, the transmission nut is provided with an external thread, the connecting sleeve is provided with an internal thread matched with the external thread, and the transmission nut and the connecting sleeve are connected through threads to realize fixation.

Preferably, the inner pipe is provided with an annular groove, a guide ring is arranged in the annular groove, the guide ring is provided with at least one guide protrusion, and the inner wall of the outer pipe is provided with a guide groove matched with the guide protrusion.

Preferably, the outer diameter of the connecting sleeve and the outer diameter of the inner pipe are kept consistent.

Preferably, the transmission assembly comprises a transmission worm and a transmission worm wheel, the transmission worm is connected with the driving motor, the transmission worm wheel is sleeved outside the rotating screw rod, and a clutch device is arranged between the transmission worm wheel and the rotating screw rod.

Preferably, the clutch device comprises a coupling gear sleeve and a return spring, the coupling gear sleeve is sleeved on the rotating screw rod and can axially move relative to the rotating screw rod, and the coupling gear sleeve is in transmission connection with the transmission worm wheel.

Preferably, the linear actuator further comprises a housing and a hand-pulling release assembly mounted on the housing, the housing is rotatably mounted with a swing rod, the hand-pulling release assembly comprises a pull rod axially movably arranged relative to the rotary screw rod, the swing rod is connected with the pull rod, and when the pull rod is pulled, the swing rod swings to axially push the clutch device.

Preferably, the linear actuator further comprises a first friction sleeve and a second friction sleeve which are sleeved on the rotary screw rod, the first friction sleeve and the second friction sleeve are axially abutted, a self-locking torsion spring is sleeved outside the first friction sleeve, a release torsion spring is sleeved on the second friction sleeve, when the rotary screw rod is subjected to axial load, the rotary screw rod transmits axial force to the shell through the first friction sleeve and the second friction sleeve, and the axial force is not transmitted between the coupling gear sleeve and the first friction sleeve and between the coupling gear sleeve and the second friction sleeve in the axial direction.

Preferably, the first friction sleeve is arranged at the end part of the rotating screw rod, the shell comprises a tail slider arranged at the end part, and the tail slider and the second friction sleeve are axially limited.

Preferably, the linear actuator further comprises a push block, the push block is provided with a guide surface, the release torsion spring comprises a pin extending in the radial direction, the shell is provided with a pull rod movably arranged in the axial direction relative to the rotating screw rod, the pull rod is connected with the push block and pulls the pull rod, and the guide surface on the push block is abutted against the pin, so that the release torsion spring expands outwards.

These features and advantages of the present invention will be disclosed in more detail in the following detailed description and the accompanying drawings.

[ description of the drawings ]

The invention is further described below with reference to the accompanying drawings:

FIG. 1 is a general schematic view of a linear actuator according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of an internal structure of a linear actuator according to an embodiment of the present invention;

FIG. 3 is a partial cross-sectional view of a linear actuator according to an embodiment of the present invention;

FIG. 4 is a second schematic partial cross-sectional view of a linear actuator in accordance with an embodiment of the present invention;

fig. 5 is an exploded view of the internal components of a linear actuator according to an embodiment of the present invention.

[ detailed description ] embodiments

The technical solutions of the embodiments of the present invention are explained and illustrated below with reference to the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, and not all embodiments. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present invention.

In the following description, the terms such as "inner", "outer", "upper", "lower", "left", "right", etc., which indicate orientations or positional relationships, are used to indicate orientations or positional relationships based on the drawings, and are only used for convenience in describing embodiments and for simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention.