CN113513566B

CN113513566B - Clutch quick release mechanism and linear actuator

Info

Publication number: CN113513566B
Application number: CN202111072148.2A
Authority: CN
Inventors: 张亚斌; 黄东升; 储彬彬; 姜文超
Original assignee: Changzhou Kaidi Electrical Co Ltd
Current assignee: Changzhou Kaidi Electrical Co Ltd
Priority date: 2021-09-14
Filing date: 2021-09-14
Publication date: 2022-01-18
Anticipated expiration: 2041-09-14
Also published as: CN113513566A

Abstract

The invention relates to the technical field of linear actuators, and provides a linear actuator, which relates to a clutch quick release mechanism and comprises a screw rod, a worm gear, a clutch in transmission fit with the worm gear and a controller acting on the worm gear, wherein the screw rod comprises a screw rod head and a screw rod main body, the worm gear is sleeved on the screw rod head and can axially move along the screw rod head, the clutch is sleeved on the screw rod main body, and the controller is used for driving the worm gear to be disconnected with the clutch. When releasing, this clutch mainly relies on the controller to stir the worm wheel and make worm wheel and clutch disconnection, and when worm wheel and clutch disconnection, the controller only can produce pressure to the axle head of lead screw head, and can not produce corresponding unfavorable frictional resistance to the lead screw main part, so the lead screw main part can not receive the influence to the release can be smooth and easy.

Description

Clutch quick release mechanism and linear actuator

Technical Field

The invention relates to the technical field of linear actuators, in particular to a clutch quick release mechanism and a linear actuator.

Background

The linear actuator, also called an electric push rod, is widely applied to the fields of smart homes, automobiles, medical treatment, solar power generation and the like. Because of the diverse application environments of the linear actuator, the linear actuator may encounter a failure of the driving motor, a power failure or other unexpected power cut-off conditions, so that the setting of the release function is necessary, and the demand of the release function is increasingly high for high-end products. The release mainly refers to that the power between the driving motor and the screw rod is cut off, so that the reverse pushing can be realized by manually driving the screw rod to rotate.

The prior art has a major disadvantage in the arrangement of the release mechanism. On one hand, because resistance and friction force exist between the screw rod and the worm wheel, the release of the linear actuator can be finished only by heavy load, the release process is not smooth, and the noise of the release process is large; on the other hand, the transmission and the matching between the internal components of the linear actuator and the screw rod, the shell and the like are adversely affected by unbalance loading and reverse pushing, and are easy to damage, and the normal operation of the linear actuator is affected once the linear actuator is damaged.

Disclosure of Invention

The invention aims to overcome the defect that the conventional release mechanism cannot release smoothly, and provides a clutch quick-release mechanism and a linear actuator.

The technical scheme for realizing the purpose of the invention is as follows: the utility model provides a separation and reunion quick release mechanism, includes lead screw, worm wheel, with worm wheel transmission complex clutch and act on the controller of worm wheel, the lead screw includes lead screw head and lead screw main part, the worm wheel cover is established on the lead screw head and can be followed lead screw head axial displacement, the clutch suit is in the lead screw main part, the controller is used for driving worm wheel and clutch disconnection.

According to the technical scheme, the controller is provided with a control switch, a connecting part, a first elastic piece and a toggle switch, the control switch and the toggle switch are respectively located at two ends of the connecting part, and the first elastic piece is located between the connecting part and the toggle switch.

According to the technical scheme, the worm wheel and the clutch are in one of tooth-shaped meshing or spline matching.

According to the technical scheme, the shaft axis of the screw rod head is the same as that of the screw rod main body.

According to the technical scheme, the screw rod head is fixedly connected with a supporting piece, and a second elastic piece is arranged between the worm wheel and the supporting piece.

According to the technical scheme, the clutch is in interference fit with the screw rod main body, or the clutch and the screw rod main body are in interference fit through the connecting piece.

Above-mentioned technical scheme the silk pole head with strutting piece structure as an organic whole.

The linear actuator comprises the clutch quick release mechanism and is provided with a shell, the shell is fixedly connected with a motor, a rear connecting piece and a special-shaped pipe, the screw rod main body is connected with an inner pipe through a screw rod nut, the worm wheel and the clutch are arranged inside the shell, the supporting piece is positioned inside the rear connecting piece, and an output shaft worm of the motor is connected with the worm wheel.

According to the technical scheme, the centering assembly is arranged in the shell and provided with the supporting sleeve, the bearing is arranged in the supporting sleeve, and the lead screw main body is in interference fit with the bearing.

According to the technical scheme, the controller is provided with the connecting plate, and the connecting plate is fixed at the upper end of the shell.

After the technical scheme is adopted, the invention has the following positive effects:

1. according to the clutch quick release mechanism, when the clutch quick release mechanism is released, the worm gear is pulled by the controller to disconnect the worm gear from the clutch, and the lead screw is of a split structure, so that the worm gear is not in contact with the lead screw main body after the worm gear is disconnected from the clutch, resistance and friction force from the worm gear cannot be applied to the lead screw main body in the process of reversing the lead screw main body, friction among an internal component connected to the lead screw head, the shell and a rear connecting piece does not need to be overcome, and therefore the clutch quick release mechanism can be released under light load and is very smooth to release, and the effect is verified through tests.

2. When releasing, the pressure that the worm wheel was stirred to the controller can cause the worm wheel unbalance loading, adopts the split type setting of lead screw after, the pressure of worm wheel unbalance loading only can be exerted on the lead screw head, and when the lead screw main part reverses, lead screw head and worm wheel do not receive any power influence, has overcome among the traditional structure wearing and tearing and the deformation that lead screw and worm wheel hole caused because of unbalance loading and reversal, and the life of worm wheel and lead screw all obtains the extension, and the transmission efficiency of actuator can not reduce because of releasing many times.

3. When the release is carried out, the worm wheel, the screw rod head and the internal component connected with the screw rod head cannot rotate, so that no friction exists between the worm wheel, the screw rod head and the shell and between the worm wheel, the screw rod head and the internal component connected with the screw rod head, and the noise is lower; a needle bearing can be arranged between the worm wheel and the screw rod head, the screw rod head is prevented from rotating along with the worm wheel in the operation process of the linear actuator, no friction exists between an internal component connected with the screw rod head and the shell and between the internal component and the back connecting piece, and the noise is lower.

4. The controller has control switch, connecting portion, first elastic component, toggle switch, and the degree of agreeing with height, and occupation of land is little, and first elastic component can select compression spring, wave spring etc. according to the applied scene of difference, and the cost is lower.

5. The worm wheel is meshed with the clutch in a tooth form or is matched with a spline, and after the actuator is released, the worm wheel and the clutch can be quickly and accurately restored to an operation matching state without manual adjustment.

6. Compare with whole lead screw structure, support piece only need provide the support to the lead screw head, therefore support piece's atress is very little, and support piece's material, size have all had bigger selection and design space, can effectively reduce the cost.

7. The screw rod head can adopt a low-friction coefficient material, and is designed into an optical axis, and the poking controller and the worm gear can be more smoothly reset.

8. The centering assembly is arranged in the shell and can ensure that the axial leads of the screw rod head and the screw rod main body are the same, so that the transmission efficiency is higher; and as the optimization of structure, centering assembly can select the support cover and the duplex bearing setting that transmission efficiency is higher, or select whole rolling member, and suitable increase size can improve axial bearing capacity to can be according to the application scenario of difference, compromise the demand of performance and cost.

Drawings

In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the present disclosure taken in conjunction with the accompanying drawings, in which

FIG. 1 is a schematic structural view of a linear brake according to the present invention;

FIG. 2 is a schematic cross-sectional view of the linear brake of the present invention;

FIG. 3 is an exploded view of the construction of the linear brake of the present invention;

fig. 4 is a perspective view of relevant parts of the controller.

In the figure: the automatic clutch comprises a worm wheel 1, a clutch 2, a controller 3, a screw head 4, a screw main body 5, a support 6, a first shaft sleeve 7, a second elastic piece 8, a needle bearing 9, a shell 10, a connecting piece 11, a support sleeve 12, a bearing 13, a second shaft sleeve 14, a screw nut 15, a motor 20, a rear connecting piece 30, a control switch 31, a connecting part 32, a first elastic piece 33, a toggle switch 34, a connecting plate 35, a special pipe 40 and an inner pipe 50.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

(example 1)

Referring to fig. 1, 2, 3 and 4, the invention provides a clutch quick release mechanism, which comprises a lead screw, a worm wheel 1, a clutch 2 in transmission fit with the worm wheel 1, and a controller 3 acting on the worm wheel 1, wherein the lead screw comprises a lead screw head 4 and a lead screw main body 5, the worm wheel 1 is sleeved on the lead screw head 4 and can axially displace along the lead screw head 4, the clutch 2 is sleeved on the lead screw main body 5, and the controller 3 is used for driving the worm wheel 1 to be disconnected from the clutch 2.

The present embodiment is a basic embodiment of a clutch quick release mechanism, the axial lead of the screw head 4 is the same as the axial lead of the screw body 5, but a gap is left between the screw head 4 and the screw body 5, and the gap is not contacted. The clutch 2 can be connected with the lead screw main body 5 in an interference fit mode. The screw head 4 can be made of a material with a low friction coefficient, and the controller 3 can be more smoothly pulled open. The clutch 2 is a commercially available clutch of the prior art, which is not displaced in the axial direction with respect to the axially shiftable worm gear. One of the tooth meshing and spline matching can be realized between the worm wheel 1 and the clutch 2, and it is understood that the tooth meshing or spline matching can be in various shapes and is not specially specified, and any spline structure which can enable the worm wheel 1 and the clutch 2 to mesh or match can be realized. The worm wheel 1 is connected with the screw rod head 4, and the clutch 2 is fixed with the screw rod main body 5.

When the screw rod is normally used, the worm wheel 1 drives the clutch 2 to rotate through tooth-shaped meshing or spline matching, and then the screw rod main body 5 is driven to rotate. When releasing, the controller 3 is used for poking the worm wheel 1 to disconnect the worm wheel 1 from the clutch 2. When the screw rod is pulled out under stress, the screw rod main body 5 and the screw rod head 4 are arranged in a clearance mode, and the screw rod main body and the screw rod head are not connected. When releasing, worm wheel 1 and clutch 2 disconnection, controller 3 stir worm wheel 1 and make worm wheel 1 and clutch 2 disconnection, and when worm wheel 1 and clutch 2 disconnection, under the effect of controller 3, worm wheel 1 only can produce pressure to the axle head of screw rod head 4, and can not produce corresponding unfavorable frictional resistance to screw rod main part 5, so screw rod main part 5 can not receive the influence to the release can be smooth and easy.

In order to make the connection between the worm wheel 1 and the screw head 4 smoother, a needle bearing 9 is arranged between the worm wheel 1 and the screw head 4, so that the worm wheel 1 can rotate around the screw head 4.

(example 2)

Referring to fig. 1, 2, 3 and 4, the present embodiment is different from embodiment 1 in that the controller 3 has a control switch 31, a connecting portion 32, a first elastic member 33 and a toggle switch 34, the control switch 31 and the toggle switch 34 are respectively located at two ends of the connecting portion 32, and the first elastic member 33 is located between the connecting portion 32 and the toggle switch 34. When the control switch 31 rotates, the connecting portion 32 is driven to rotate, the connecting portion 32 drives the toggle switch 34 to rotate, and the toggle switch 34 toggles the worm wheel 1 to be far away from the clutch 2 to be released. The first elastic member 33 may be, but not limited to, an elastic member such as a torsion spring, and the first elastic member 33 provides a return elastic force to the original position after the toggle switch 34 is toggled.

(example 3)

Referring to fig. 2 and 3, the present embodiment is different from embodiment 1 in that a support member 6 is fixedly connected to the screw head 4, and a second elastic member 8 is disposed between the worm wheel 1 and the support member 6. The support 6 may be, but is not limited to, a ball bearing. The second elastic member 8 provides an axial force to press the worm wheel 1 during normal operation, and the second elastic member 8 may be, but is not limited to, an elastic member such as a compression spring, a wave spring, etc. After the controller 3 realizes effective release, the second elastic member 8 can make the worm wheel 1 return to the original position, continue to cooperate with the clutch 2 to work or wait for the next release.

The screw head 4 and the support member 6 may be of an integral structure, and the screw head 4 and the support member 6 are used for interference fit. Alternatively, as an improvement in structure, a first bushing 7 may be provided between the support member 6 and the screw head 4, and the two may be detachably connected to each other.

The clutch 2 is in interference fit with the lead screw main body 5, or the clutch 2 and the lead screw main body 5 are in interference fit through a connecting piece 11. The coupling member 11 may be, but is not limited to, a spline housing. The screw rod main body 5 can be directly in interference fit with the clutch 2; or the lead screw main body 5 can be connected with the upper connecting piece 11 in an interference fit mode, and the clutch 2 and the connecting piece 11 are installed and fixed in an interference fit mode. The coupling member 11 may be, but is not limited to, a spline housing.

(example 4)

Referring to fig. 1, 2, 3 and 4, the present invention provides an actuator having a housing 10, the housing 10 fixedly connected with a motor 20, a rear connector 30, a profile tube 40, a lead screw body 4 connected with an inner tube 50 through a lead screw nut 15, a worm wheel 1 and a clutch 2 provided inside the housing 10, a support 6 located inside the rear connector 30, and an output shaft worm of the motor 20 connected to the worm wheel 1. The inner tube 50 is movably connected to the inside of the profile tube 40 and the motor 20 is located at the lower end of the housing 10. The upper end of the casing 10 is provided with a notch matched with the toggle switch 34 and the first elastic element 33 for installation, and is fixed by a bolt through a connecting plate 35. The support member 6 is also mounted inside the rear connecting member 30 after being connected to the first hub 7. The support sleeve 12 is arranged on the right side of the clutch 2 and is mounted in the housing 10. During normal operation, the worm wheel 1 and the clutch 2 are engaged or spline-fitted, the motor 20 rotates, a worm (not shown in the figure) connected with an output shaft of the motor drives the worm wheel 1 to rotate, the worm wheel 1 drives the clutch 2 to rotate, the clutch 2 drives the lead screw main body 5 to rotate, the lead screw main body 5 acts on the lead screw nut 15, and the lead screw nut 15 drives the inner tube 50 to contract and do work in the special-shaped tube 40. When releasing, the control switch 31 of the dial controller 3 drives the connecting part 32, and the connecting part 32 drives the dial switch 34 to dial the worm wheel 1 to disconnect the worm wheel 1 from the clutch 2. When releasing, worm wheel 1 and clutch 2 disconnection, controller 3 stir worm wheel 1 and make worm wheel 1 and clutch 2 disconnection, and when worm wheel 1 and clutch 2 disconnection, controller 3 only can produce pressure to the axle head of lead screw head 4, and can not produce corresponding unfavorable frictional resistance to lead screw main part 5, so lead screw main part 5 can not receive the influence to the release can be smooth and easy.

As the optimization of the structure, the quick clutch release mechanism can be conveniently applied to a linear actuator, a centering assembly is arranged in the shell 10, the centering assembly is provided with a supporting sleeve 12, a bearing 13 is arranged in the supporting sleeve 12, and the lead screw main body 5 is in interference fit with the bearing 13. The bearing 13 may also engage the second bushing 14 for better operation of the bearing 13. In order to better provide the axial bearing capacity, the bearing 13 is provided with two bearings in parallel, so that the screw rod body 5 of the linear actuator is more efficient in transmission.

As a further preference, the clutch 2 is rotatably connected to a support sleeve 12, and the support sleeve 12 is used for supporting the rotation of the lead screw body 5. The support sleeve 12 may be formed as an integral rolling member of appropriately increased size to improve axial load bearing capacity.

In order to make the controller 3 be better coupled to the housing 10, the controller 3 is provided with a connection plate 35, the connection plate 35 is fixed to the upper end of the housing 10, and specifically, the controller 3 is sleeved with the connection plate 35 on the connection portion 32.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A clutched quick release mechanism, comprising: including lead screw, worm wheel (1), with worm wheel (1) transmission complex clutch (2) and act on controller (3) of worm wheel (1), the lead screw includes lead screw head (4) and lead screw main part (5), lead screw head (4) with leave the clearance between lead screw main part (5), worm wheel (1) cover is established on lead screw head (4) and can be followed lead screw head (4) axial displacement, clutch (2) suit is on lead screw main part (5), controller (3) are used for driving worm wheel (1) and clutch (2) disconnection.

2. The clutched quick release mechanism of claim 1, wherein: the controller (3) is provided with a control switch (31), a connecting part (32), a first elastic piece (33) and a toggle switch (34), the control switch (31) and the toggle switch (34) are respectively positioned at two ends of the connecting part (32), and the first elastic piece (33) is positioned between the connecting part (32) and the toggle switch (34).

3. The clutched quick release mechanism of claim 1, wherein: the worm wheel (1) and the clutch (2) are in one of tooth-shaped meshing or spline matching.

4. The clutched quick release mechanism of claim 1, wherein: the axial lead of the screw rod head (4) is the same as the axial lead of the screw rod main body (5).

5. The clutched quick release mechanism of claim 1, wherein: the screw rod head (4) is fixedly connected with a supporting piece (6), and a second elastic piece (8) is arranged between the worm wheel (1) and the supporting piece (6).

6. The clutched quick release mechanism of claim 1, wherein: the clutch (2) is in interference fit with the lead screw main body (5), or the clutch (2) and the lead screw main body (5) are in interference fit through a connecting piece (11).

7. The clutched quick-release mechanism of claim 5, wherein: the screw rod head (4) and the support piece (6) are of an integral structure.

8. A linear actuator comprising a clutched quick release mechanism as claimed in any one of claims 1 to 7, wherein: the screw rod is provided with a shell (10), wherein the shell (10) is fixedly connected with a motor (20), a rear connecting piece (30) and a special-shaped pipe (40), the screw rod main body (5) is connected with an inner pipe (50) through a screw rod nut (15), the worm wheel (1) and the clutch (2) are arranged inside the shell (10), and an output shaft worm of the motor (20) is connected with the worm wheel (1).

9. A linear actuator as claimed in claim 8, wherein: the screw rod comprises a shell (10), and is characterized in that a centering assembly is arranged in the shell (10), the centering assembly is provided with a supporting sleeve (12), a bearing (13) is arranged in the supporting sleeve (12), and the screw rod body (5) is in interference fit with the bearing (13).

10. A linear actuator as claimed in claim 8, wherein: the controller (3) is provided with a connecting plate (35), and the connecting plate (35) is fixed at the upper end of the shell (10).