WO2024066777A1

WO2024066777A1 - Linear driver with hand-cranking function

Info

Publication number: WO2024066777A1
Application number: PCT/CN2023/113266
Authority: WO
Inventors: 吕佐朝; 陈春奇; 范义广
Original assignee: 德沃康科技集团有限公司
Priority date: 2022-09-26
Filing date: 2023-08-16
Publication date: 2024-04-04
Also published as: CN219067996U

Abstract

Disclosed is a linear driver with a hand-cranking function, comprising a shell, an actuating mechanism, a supporting part and a crank, wherein the shell is provided with a mounting cavity and an opening in communication with the mounting cavity; the actuating mechanism comprises a first bearing, a motor, a worm wheel driven by rotation of a motor shaft, and a lead screw in transmission connection with the worm wheel; the first bearing and the worm wheel are both arranged in the mounting cavity, a first rotating shaft is coaxially and integrally formed at one end of the worm wheel close to the opening, and the first bearing sleeves the first rotating shaft and is in close fit with the first rotating shaft and the shell; one end of the supporting part extends into the mounting cavity from the opening of the shell and is fixedly connected to the shell; and the crank extends into the supporting part and is selectively meshed with the first rotating shaft, so that the worm wheel rotates along with the crank.

Description

Linear actuator with hand crank function

This disclosure claims the priority of the Chinese patent application number 202222543981.7 filed with the Chinese Patent Office on September 26, 2022. The entire contents of the above application are incorporated into this application by reference.

Technical Field

The present application relates to the technical field of linear actuators, for example, to a linear actuator with a hand-cranking function.

Background technique

The common linear actuators on the market mainly include a motor, a worm gear, a worm, a lead screw, a nut and a telescopic tube. The motor is used to drive the worm to rotate, thereby driving the worm gear to rotate. The worm gear is fixedly connected to the lead screw coaxially, the nut is fixedly connected to the telescopic rod, and the lead screw and nut threads cooperate, so that the telescopic tube is driven by the nut to make a linear reciprocating displacement along the axial direction of the lead screw.

However, since the worm gear of the current linear actuator is driven by an electric motor, the linear actuator cannot work properly when there is a power outage or power failure. Therefore, a linear actuator with a hand-cranking function is designed, which drives the worm gear to rotate by extending a crank into the linear actuator housing.

In the related art, a linear actuator with a hand-crank function usually has an engaging portion threaded onto the lead screw, and the crank engages with the engaging portion, thereby driving the lead screw to rotate. However, there are problems with poor connection strength between the lead screw and the engaging portion and the threaded connection is easy to loosen. In addition, the engaging portion is difficult to process and there is also a problem of high processing cost.

Summary of the invention

The present application provides a linear actuator with a hand-cranking function to solve the above-mentioned problems existing in the related art.

The embodiment of the present application provides a linear actuator with a hand-cranking function, and the linear actuator with a hand-cranking function includes:

A housing, wherein the housing is provided with a mounting cavity and an opening communicating with the mounting cavity;

The actuating mechanism comprises a first bearing, a motor, a worm wheel driven by the motor shaft, and a screw connected to the worm wheel. The first bearing and the worm wheel are both arranged in the mounting cavity. The end of the worm wheel close to the opening is coaxially integrally provided with a first rotating shaft. The first bearing sleeve is arranged on the first rotating shaft. The first rotating shaft and the housing are tightly matched with the first bearing sleeve. A rotating shaft is opposite to the opening;

A support portion, one end of which extends from the opening into the mounting cavity and is sealed and connected to the inner wall of the housing, the support portion being provided with a through hole, and the through hole being coaxially arranged with the first rotating shaft;

The telescopic structure comprises a nut threadedly connected to the screw rod and a telescopic tube fixed to the nut;

A crank extends into the through hole and selectively engages with the first rotating shaft, so that the worm gear rotates with the crank.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a structural schematic diagram of a linear actuator with a hand-cranking function in Embodiment 1 of the present application;

FIG2 is a second structural schematic diagram of a linear actuator with a hand-cranking function in Embodiment 1 of the present application;

FIG3 is a cross-sectional view of FIG1 ;

FIG4 is a partial enlarged view of point A in FIG3 ;

FIG5 is a schematic diagram of the structure of the housing in the first embodiment of the present application;

FIG6 is a cross-sectional view of a linear actuator with a hand-cranking function in Embodiment 2 of the present application;

FIG. 7 is a partial enlarged view of point B in FIG. 6 .

In the figure:
1. housing; 11. mounting cavity; 12. opening;
2. First bearing; 3. Worm gear; 4. First rotating shaft; 5. Second rotating shaft; 6. Second bearing;
7. Supporting part; 70. Through hole; 71. Sleeve; 711. First limiting groove; 72. First sealing ring;
73, fixing ring; 731, second limiting groove; 74, second sealing ring;
8. Crank handle;
9. Rubber plug; 91. Sealing protrusion;
30. Motor; 31. Screw rod; 32. Nut; 33. Telescopic tube.

Detailed ways

The present application will be described below in conjunction with the accompanying drawings, and the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

In the description of this application, it should be noted that the terms "center", "upper", "lower", "left", The directions or positional relationships indicated by "right", "vertical", "horizontal", "inside", "outside", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the meanings of the above terms in this application can be understood according to the circumstances.

The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application.

Embodiment 1

As shown in Figures 1-5, this embodiment provides a linear actuator with a hand-crank function, which includes a shell 1, an actuating mechanism, a support portion 7, a crank handle 8 and a telescopic structure. The shell 1 is provided with a mounting cavity 11 and an opening 12 connected to the mounting cavity 11; the actuating mechanism includes a first bearing 2, a motor 30 and a worm gear 3 driven by the shaft of the motor 30, and a screw rod 31 connected to one end of the worm gear 3. The first bearing 2 and the worm gear 3 are both arranged in the mounting cavity 11, and one end of the worm gear 3 close to the opening 12 is coaxially integrally provided with a first bearing 2, a motor 30 and a worm gear 3 driven by the shaft of the motor 30, and a screw rod 31 connected to one end of the worm gear 3. A rotating shaft 4, a first bearing 2 is sleeved on the first rotating shaft 4, the first rotating shaft 4 and the housing 1 are both tightly fitted with the first bearing 2, and the first rotating shaft 4 is opposite to the opening 12; one end of the support portion 7 extends into the installation cavity 11 from the opening 12 and is sealed with the inner wall of the housing 1, the support portion 7 is provided with a through hole 70, and the through hole 70 is coaxially arranged with the first rotating shaft 4; the telescopic structure includes a nut 32 threadedly connected to the screw rod 31 and a telescopic tube 33 fixed to the nut 32; the crank 8 extends into the through hole 70 and selectively engages with the first rotating shaft 4, so that the worm wheel 3 rotates with the crank 8. The worm wheel 3 of the device is integrally formed with a first rotating shaft 4, and the first rotating shaft 4 is provided with meshing teeth, which can directly mesh with the crank 8, thereby improving the strength between the first rotating shaft 4 and the worm wheel 3, and solving the problem that the linear actuator with a hand-crank function in the related technology usually has a meshing portion screwed on the lead screw, and the crank 8 meshes with the meshing portion, thereby driving the lead screw to rotate, but there is a problem of poor connection strength and easy loosening between the lead screw and the meshing portion, and at the same time, it also reduces the processing cost of the linear actuator with a hand-crank function in the related technology.

For example, one end of the support portion 7 extends from the opening 12 into the installation cavity 11 and is sealed with the inner wall of the housing 1. This can prevent external moisture and dust from entering the installation cavity 11 through the gap between the support portion 7 and the housing 1 .

Optionally, the linear actuator with hand-cranking function further includes a worm, a lead screw 31, a nut 32 and a telescopic tube 33. The worm and the worm wheel 3 are meshed, the motor 30 drives the worm to rotate, and then the worm wheel 3 rotates, the worm wheel 3 drives the lead screw 31 to rotate coaxially, the nut 32 is threadedly connected to the lead screw 31 and the nut 32 can only slide along the axis of the lead screw 31, but cannot rotate around the axis of the lead screw 31, and the telescopic tube 33 is fixedly connected to the nut 32. If necessary, the telescopic tube 33 can be a telescopic inner tube and a telescopic outer tube, and the connection method with the lead screw 31 is the currently common connection method.

Optionally, the support portion 7 includes a sleeve 71 and a first sealing ring 72, the first sealing ring 72 is sleeved on the outer circumference of the sleeve 71, and when one end of the sleeve 71 is inserted into the installation cavity 11, the first sealing ring 72 is located between the inner wall of the housing 1 and the outer circumference of the sleeve 71, and the through hole 70 is provided in the sleeve 71. In this embodiment, the first sealing ring 72 enables a sealed connection between the sleeve 71 and the housing 1. In one embodiment, the first sealing ring 72 is made of rubber.

Optionally, the sleeve 71 and the housing 1 are fixedly connected by bolts. In this embodiment, a plurality of connection ears are protruded along the circumference of the sleeve 71, and a plurality of bolts are respectively passed through the plurality of connection ears and are all screwed to the housing 1. In other embodiments, the sleeve 71 can also be fixed to the housing 1 by means of clamping or gluing.

Optionally, a first limiting groove 711 is provided around the outer circumference of the sleeve 71, and the first sealing ring 72 is provided in the first limiting groove 711. In this embodiment, the first limiting groove 711 can prevent the housing 1 from causing the first sealing ring 72 to move relative to the sleeve 71 when the sleeve 71 extends into the installation cavity 11, thereby affecting the airtightness between the housing 1 and the sleeve 71.

Optionally, the support portion 7 further includes a fixing ring 73, which is disposed between the first bearing 2 and the sleeve 71, and the fixing ring 73 abuts against the first bearing 2, and the fixing ring 73 abuts against the sleeve 71. In this embodiment, the fixing ring 73 is disposed between the first bearing 2 and the sleeve 71, and when the sleeve 71 and the housing 1 are relatively fixed, the sleeve 71 presses the fixing ring 73 onto the first bearing 2, and when the first rotating shaft 4 drives the inner ring of the first bearing 2 to rotate, relative sliding occurs between the inner ring of the first bearing 2 and the fixing ring 73. In this embodiment, the first rotating shaft 4 of the worm gear 3 is extended into the sleeve 71, and the fixing ring 73 can stabilize the first rotating shaft 4.

Optionally, the support portion 7 further includes a second sealing ring 74, which is sleeved on the first rotating shaft 4 and disposed between the sleeve 71 and the first rotating shaft 4, and the second sealing ring 74 is respectively tightly pressed against the sleeve 71 and the first rotating shaft 4. In this embodiment, the second sealing ring 74 is made of rubber material, and the second sealing ring 74 can prevent dust and water vapor from entering the installation cavity 11 through the gap between the sleeve 71 and the first rotating shaft 4.

Optionally, the fixing ring 73 and the sleeve 71 are arranged to form a second limiting groove 731, the notch of the second limiting groove 731 is opposite to the first rotating shaft 4, and the second sealing ring 74 is arranged in the second limiting groove 731. In this embodiment, the second limiting groove 731 can limit the relative position of the second sealing ring 74 and the first rotating shaft 4.

Optionally, the actuating mechanism further comprises a second rotating shaft 5 and a second bearing 6, both of which are arranged in the mounting cavity 11, and the second rotating shaft 5 is coaxially arranged at one end of the worm gear 3 away from the opening 12, the inner ring of the second bearing 6 is tightly matched with the second rotating shaft 5, and the outer ring of the second bearing 6 is tightly matched with the inner wall of the housing 1. The screw rod 31 is tightly fitted and fixedly connected to the second rotating shaft 5 coaxially. In this embodiment, the first bearing 2 and the second bearing 6 simultaneously support both ends of the worm wheel 3, thereby increasing the rotation stability of the worm wheel 3.

Embodiment 2

As shown in FIG. 6 and FIG. 7 , this embodiment is substantially the same as the first embodiment, the only difference being that the second sealing ring 74 and the fixing ring 73 are not included.

Optionally, the linear actuator with hand-cranking function further includes a rubber plug 9, which is selectively inserted into the through hole 70 at the end of the sleeve 71 away from the housing 1. When the crank 8 is pulled out of the through hole 70, the rubber plug 9 is inserted into the through hole 70. In this embodiment, when the crank 8 is not needed to drive the first rotating shaft 4, the rubber plug 9 is inserted into the through hole 70 at the end of the sleeve 71 away from the housing 1, thereby preventing external water vapor and dust from entering the installation cavity 11 through the sleeve 71.

In one embodiment, the outer circumferential surface of the rubber plug 9 is provided with a sealing protrusion 91 along its circumferential direction, and when the rubber plug 9 is inserted into the through hole 70, the sealing protrusion 91 is tightly pressed against the sleeve 71. In this embodiment, the sealing protrusion 91 is provided to better prevent foreign matter from entering the installation cavity 11 through the sleeve 71.

Claims

A linear actuator with a hand-cranking function, comprising:

A housing (1), the housing (1) being provided with a mounting cavity (11) and an opening (12) communicating with the mounting cavity (11);

The actuating mechanism comprises a first bearing (2), a motor (30), a worm wheel (3) driven by the shaft of the motor (30), and a screw rod (31) connected to the worm wheel (3); the first bearing (2) and the worm wheel (3) are both arranged in the mounting cavity (11); a first rotating shaft (4) is coaxially formed and integrally provided at one end of the worm wheel (3) close to the opening (12); the first bearing (2) is sleeved on the first rotating shaft (4); the first rotating shaft (4) and the housing (1) are both tightly matched with the first bearing (2); and the first rotating shaft (4) is opposite to the opening (12);

a support portion (7), one end of the support portion (7) extending from the opening (12) into the installation cavity (11) and being sealedly connected to the inner wall of the housing (1), the support portion (7) being provided with a through hole (70), and the through hole (70) being coaxially arranged with the first rotating shaft (4);

The telescopic structure comprises a nut (32) threadedly connected to the screw rod (31) and a telescopic tube (33) fixedly connected to the nut (32);

A crank (8), wherein the crank (8) extends into the through hole (70) and selectively engages with the first rotating shaft (4), so that the worm gear (3) rotates following the crank (8).
According to claim 1, the linear actuator with a hand-crank function, wherein the support portion (7) comprises a sleeve (71) and a first sealing ring (72), the first sealing ring (72) is sleeved on the outer circumferential surface of the sleeve (71), and when one end of the sleeve (71) is inserted into the mounting cavity (11), the first sealing ring (72) is located between the inner wall of the housing (1) and the outer circumferential surface of the sleeve (71), and the through hole (70) is provided in the sleeve (71).
The linear actuator with hand-cranking function according to claim 2, wherein the sleeve (71) and the housing (1) are fixedly connected.
According to the linear actuator with hand-crank function as claimed in claim 2, wherein a first limiting groove (711) is arranged around the outer circumferential surface of the sleeve (71), and the first sealing ring (72) is arranged in the first limiting groove (711).
According to the linear actuator with hand-cranking function as claimed in claim 4, the support portion (7) further comprises a fixing ring (73), the fixing ring (73) is arranged between the first bearing (2) and the sleeve (71), the fixing ring (73) abuts against the first bearing (2), and the fixing ring (73) abuts against the sleeve (71).
According to claim 5, the linear actuator with hand-cranking function, wherein the support portion (7) further comprises a second sealing ring (74), and the second sealing ring (74) is sleeved on the first rotating shaft (4). The second sealing ring (74) is arranged between the sleeve (71) and the first rotating shaft (4), and is respectively tightly pressed against the sleeve (71) and the first rotating shaft (4).
According to claim 6, the linear actuator with a hand-cranking function, wherein the fixing ring (73) and the sleeve (71) are arranged to form a second limiting groove (731), the notch of the second limiting groove (731) is opposite to the first rotating shaft (4), and the second sealing ring (74) is arranged in the second limiting groove (731).
According to the linear actuator with a hand-crank function as claimed in claim 4, the linear actuator with a hand-crank function further comprises a rubber plug (9), and when the crank handle (8) is pulled out of the through hole (70), the rubber plug (9) is inserted into the through hole (70).
According to the linear actuator with hand-cranking function as claimed in claim 8, the outer peripheral surface of the rubber plug (9) is provided with a sealing protrusion (91) along its circumferential direction, and when the rubber plug (9) is inserted into the through hole (70), the sealing protrusion (91) is tightly pressed against the sleeve (71).
According to any one of claims 1 to 9, the linear actuator with a hand-cranking function, wherein the actuating mechanism further comprises a second rotating shaft (5) and a second bearing (6), the second rotating shaft (5) and the second bearing (6) are both arranged in the mounting cavity (11), the second rotating shaft (5) is coaxially arranged at one end of the worm gear (3) away from the opening (12), the inner ring of the second bearing (6) is tightly fitted with the second rotating shaft (5), the outer ring of the second bearing (6) is tightly fitted with the inner wall of the housing (1), and the screw rod (31) is coaxially fixedly connected with the second rotating shaft (5).