CN210397626U - Actuator with asymmetric housing - Google Patents

Abstract

The utility model discloses an actuator with asymmetric shell, which comprises a shell, a driving module, a telescopic rod component and a microswitch, wherein the shell comprises a lower half shell and an upper half shell which are mutually assembled, the lower half shell and the upper half shell are provided with a bottom plate and a top plate and are jointly provided with bearing holes, and the thickness of the lower half shell is larger than that of the upper half shell so as to ensure that the central line of the bearing hole is higher than that of the shell; the driving module is accommodated in the shell and comprises a motor clamped between the bottom plate and the top plate; the telescopic rod component is accommodated in the shell and comprises a lead screw driven by a motor to rotate and an extension tube in screw connection transmission with the lead screw, and the lead screw is positioned corresponding to the bearing hole so that the distance between the lead screw and the bottom plate is larger than the distance between the lead screw and the top plate; the micro switch is arranged between the guide screw rod and the bottom plate. The utility model discloses the actuator has the advantage of reduction width and thickness.

Description

Actuator with asymmetric housing

Technical Field

The present invention relates to a linear actuator, and more particularly, to an actuator with an asymmetric housing.

Background

Linear actuators (Linear actuators) are mainly used for position adjustment and have been used in a large number of daily life devices such as massage chairs, running machines, folding beds, etc. As shown in fig. 1, the conventional linear actuator utilizes driving components such as a driving motor a10 and a worm wheel a20 to drive a lead screw a30 to rotate, and drives a telescopic tube a40 screwed thereon to linearly extend or retract relative to an outer tube a50 sleeved outside a telescopic tube a40 by the lead screw a 30.

In addition, the linear actuator is designed to have a compact size, and the thickness of the driving motor a10 is substantially equal to the height of the cavity formed by the upper housing a60 and the lower housing a70, so that no extra space exists between the driving motor a10, the upper housing a60 and the lower housing a70 after the linear actuator is assembled, and the thickness of the linear actuator is further reduced.

However, the above-mentioned linear actuator still has the following disadvantages that since the thicknesses of the upper casing a60 and the lower casing a70 are equal, and the upper casing a60 and the lower casing a70 jointly form a bearing hole for positioning the lead screw a30, the axis of the lead screw a30 is disposed close to the center line a80 of the casing a60 and the lower casing a70, so that the distance between the upper side of the lead screw a30 and the upper casing a60 and the distance between the lower side of the lead screw a30 and the lower casing a70 are equal, but the micro switch a90 cannot be mounted at either of the two distances, and the micro switch a90 can only be disposed at the left side and the right side of the lead screw a30, so that the width of the linear actuator cannot be reduced.

In view of the above, the present inventor has made an intensive study on the above prior art and applied the study in cooperation with the theory to solve the above problems, which is an improved objective of the present inventor.

SUMMERY OF THE UTILITY MODEL

The utility model provides a casing asymmetric actuator, it utilizes to move up the position of lead screw, makes the interval of lead screw to bottom plate be greater than the interval of lead screw to roof, lets micro-gap switch can install between lead screw and bottom plate to reach the efficiency of the width of reduction actuator.

In an embodiment of the present invention, the utility model provides an asymmetric actuator of casing, include: the shell comprises a lower half shell and an upper half shell which are mutually assembled, the lower half shell and the upper half shell are respectively provided with a bottom plate, a top plate and a bearing hole, which are opposite, the thickness of the lower half shell is larger than that of the upper half shell, so that the position of the central line of the bearing hole is higher than that of the central line of the shell; a driving module accommodated in the housing, the driving module including a motor sandwiched between the bottom plate and the top plate; a telescopic rod component, which is arranged in the shell and comprises a guide screw rod driven by the motor to rotate and a telescopic tube in screw connection transmission with the guide screw rod, wherein the guide screw rod is positioned corresponding to the bearing hole so that the distance between the guide screw rod and the bottom plate is larger than the distance between the guide screw rod and the top plate; and at least one micro switch installed between the lead screw and the bottom plate and configured corresponding to the lead screw.

Based on the above, the position of the lead screw is moved upwards, the distance from the lead screw to the bottom plate is larger than the distance from the lead screw to the top plate, the space between the lead screw and the bottom plate can be provided with the micro switch, the situation that the width of the actuator is increased due to the fact that the micro switch is arranged on the left side and the right side of the lead screw is omitted, and the advantage that the width of the actuator is reduced is achieved.

Based on the aforesaid, the bottom plate is equipped with down the caulking groove, and the roof is equipped with the caulking groove, and half shell and first shell enclose out the appearance chamber down, and the caulking groove and the bottom of inlaying on locating of the top of motor inlay and locate down the caulking groove to the thickness that makes the motor is greater than the height that holds the chamber, and the thickness of motor is less than or equal to the sum of the thickness of half shell and the thickness of first shell down, makes the utility model discloses the actuator has the advantage of reduction thickness.

Drawings

FIG. 1 is a cross-sectional schematic view of a known linear actuator;

fig. 2 is an exploded perspective view of the actuator of the present invention;

fig. 3 is another exploded perspective view of the actuator of the present invention;

fig. 4 is a schematic combination diagram of the actuator of the present invention;

fig. 5 is a schematic cross-sectional view of an actuator according to the present invention;

FIG. 6 is an enlarged partial schematic view of FIG. 5;

fig. 7 is another schematic cross-sectional view of the actuator of the present invention;

fig. 8 is a partially enlarged cross-sectional view of another embodiment of the actuator of the present invention.

Symbolic illustration in the drawings:

(known)

a10 drive motor;

a20 worm gear;

a30 lead screw;

a40 telescoping tube;

a50 outer tube;

a60 upper shell;

a70 lower shell;

a80 centerline;

a90 micro-switch;

this creation

10 an actuator;

1, a shell;

11 a lower half-shell;

12 an upper half shell;

13 a base plate;

14 a top plate;

131. 141 inner wall surface;

132. 142 an outer wall surface;

15 bearing holes;

16 lower caulking grooves;

17, embedding a groove;

a cavity 18;

2, driving the module;

21 a motor;

22 a worm gear;

3 a telescopic rod assembly;

31 a lead screw;

32 telescopic pipes;

321 a rear support;

33 a front support;

34 an outer tube;

4, a microswitch;

5. a 5' waterproof cover;

c1 and c2 axes;

l1, L2 centerlines;

h1, h2, h3 thickness;

h4 height;

s1, s 2.

Detailed Description

The detailed description and technical contents of the present invention will be described below with reference to the accompanying drawings, which are provided for illustrative purposes only and are not intended to limit the present invention.

Referring to fig. 2 to 7, the present invention provides an actuator with asymmetric housing, the actuator 10 mainly includes a housing 1, a driving module 2, a telescopic rod assembly 3 and one or more micro switches 4.

As shown in fig. 2 to 7, the housing 1 includes a lower half-housing 11 and an upper half-housing 12 assembled to each other, the lower half-housing 11 and the upper half-housing 12 respectively have a bottom plate 13, a top plate 14 and a bearing hole 15, the thickness h1 of the lower half-housing 11 is greater than the thickness h2 of the upper half-housing 12, so that the position of the center line L2 of the bearing hole 15 is higher than the position of the center line L1 of the housing 1.

In addition, the bottom plate 13 has an inner wall surface 131 and an outer wall surface 132, the top plate 14 also has an inner wall surface 141 and an outer wall surface 142, the bottom plate 13 has a lower caulking groove 16 penetrating through the inner wall surface 131 to the outer wall surface 132, the top plate 14 has an upper caulking groove 17 penetrating through the inner wall surface 141 to the outer wall surface 142, and the lower half shell 11 and the upper half shell 12 enclose a cavity 18.

As shown in fig. 2 to 7, the driving module 2 is accommodated in the housing 1, the driving module 2 includes a motor 21 sandwiched between the bottom plate 13 and the top plate 14 and a worm wheel 22 driven by the motor 21 to rotate, and the top of the motor 21 is embedded in the upper caulking groove 17 and the bottom of the motor 21 is embedded in the lower caulking groove 16, so that the thickness h3 of the motor 21 is greater than the height h4 of the accommodating cavity 18, and the thickness h3 of the motor 21 is less than or equal to the sum of the thickness h1 of the lower half housing 11 and the thickness h2 of the upper half housing 12.

As shown in fig. 2 to 5, the telescopic rod assembly 3 is accommodated in the housing 1, the telescopic rod assembly 3 includes a lead screw 31 driven by the motor 21 to rotate and an extension tube 32 in threaded connection with the lead screw 31, the lead screw 31 is positioned corresponding to the bearing hole 15, so that a distance s1 between the lead screw 31 and the bottom plate 13 is greater than a distance s2 between the lead screw 31 and the top plate 14.

The manner of positioning the lead screw 31 corresponding to the bearing hole 15 is described in detail below, the telescopic rod assembly 3 includes a front support 33 penetrating and fixed in the bearing hole 15, the lead screw 31 is assembled to the front support 33 and can rotate relative to the front support 33, and the axial center c1 of the lead screw 31, the axial center c2 of the front support 33 and the central line L2 of the bearing hole 15 are overlapped with each other, so that the distance s1 from the lead screw 31 to the bottom plate 13 is greater than the distance s2 from the lead screw 31 to the top plate 14.

In addition, the front support 33 is a circular rod, the bearing hole 15 is a circular hole, and upper and lower semicircular sections of the circular hole are respectively formed from the upper half shell 12 and the lower half shell 11.

Furthermore, the lead screw 31 is engaged with the worm wheel 22 and is driven by the worm wheel 22 to rotate, and one end of the telescopic tube 32 away from the lead screw 31 is provided with a rear support 321.

The telescopic rod assembly 3 further comprises an outer tube 34, the outer tube 34 is sleeved outside the lead screw 31 and the telescopic tube 32, and the micro switch 4 is installed inside the outer tube 34.

As shown in fig. 5 and 7, the micro switch 4 is installed in a space between the lead screw 31 and the bottom plate 13 and is disposed corresponding to the lead screw 31, the micro switch 4 detects a slight vibration generated by the rotation of the lead screw 31 and transmits an electrical signal, and a calculator (not shown) calculates the position of the extension tube 32 according to the received electrical signal.

As shown in fig. 2 to 5, the actuator 10 of the present invention further includes two waterproof covers 5, one of the waterproof covers 5 is attached to the outer wall 132 of the bottom plate 13 and sealed to the lower caulking groove 16, and the other waterproof cover 5 is attached to the outer wall 142 of the top plate 14 and sealed to the upper caulking groove 17, so as to prevent dirt and moisture from entering the interior of the housing 1 from the lower caulking groove 16 and the upper caulking groove 17, thereby protecting the motor 21 from the dirt and moisture.

As shown in fig. 5 to 7, in the use state of the actuator 10 of the present invention, the top of the motor 21 is embedded in the upper caulking groove 17 and the bottom is embedded in the lower caulking groove 16, so that there is no excessive gap between the motor 21, the lower half shell 11 and the upper half shell 12, and the thickness of the actuator 10 is limited, thereby preventing the actuator 10 from increasing unnecessary thickness.

In addition, under the condition that the thickness of actuator 10 is restricted, the utility model discloses a thickness h1 of lower half shell 11 is greater than thickness h2 of first half shell 12 to make the position of the central line L2 of bearing hole 15 be higher than the position of the central line L1 of casing 1, lead screw 31 corresponds bearing hole 15 again and fixes a position, and then move up the position of lead screw 31, make lead screw 31 to bottom plate 13 interval s1 be greater than lead screw 31 to roof 14 interval s2, the space between lead screw 31 and bottom plate 13 can install micro-gap switch 4, save micro-gap switch 4 and install the condition that causes the increase of actuator 10's width in the left and right sides of lead screw 31 and take place, in order to reach that actuator 10 has the advantage of reducing the width.

Furthermore, compared to the conventional driving motor with a thickness substantially equal to the height of the cavity formed by the upper housing and the lower housing, the top of the motor 21 is embedded in the upper caulking groove 17 and the bottom is embedded in the lower caulking groove 16, so that the thickness h3 of the motor 21 is greater than the height h4 of the cavity 18, and the thickness h3 of the motor 21 is less than or equal to the sum of the thickness h1 of the lower housing half 11 and the thickness h2 of the upper housing half 12, so that the actuator 10 of the present invention has the advantage of reduced thickness.

Referring to fig. 8, another embodiment of the actuator 10 of the present invention is shown, the embodiment of fig. 8 is substantially the same as the embodiment of fig. 2 to 6, and the embodiment of fig. 8 is different from the embodiment of fig. 2 to 6 in that the structure of the waterproof cover 5' is different.

As will be described in detail below, one of the waterproof covers 5 'of the present embodiment is integrally formed by extending from the outer wall surface 132 of the bottom plate 13 and is sealed in the lower caulking groove 16 (not shown in fig. 8, but see the same principle as that shown in fig. 5 and 8), and the other waterproof cover 5' is integrally formed by extending from the outer wall surface 142 of the top plate 14 and is sealed in the upper caulking groove 17, so that a sealed space is formed at the lower caulking groove 16 and the upper caulking groove 17 to prevent dirt and moisture from entering the interior of the housing 1 from the lower caulking groove 16 and the upper caulking groove 17, thereby protecting the motor 21 from the dirt and moisture.

The height of the waterproof cover 5' of the present embodiment is slightly higher than the height of the outer wall surface 132 of the bottom plate 13 and the height of the outer wall surface 142 of the top plate 14, so that the thickness h3 of the motor 21 can be smaller than or equal to or larger than the sum of the thickness h1 of the lower half shell 11 and the thickness h2 of the upper half shell 12.

Claims (10)

1. An actuator with an asymmetric housing, comprising:

the shell comprises a lower half shell and an upper half shell which are mutually assembled, the lower half shell and the upper half shell are respectively provided with a bottom plate, a top plate and a bearing hole, which are opposite, the thickness of the lower half shell is larger than that of the upper half shell, so that the position of the central line of the bearing hole is higher than that of the central line of the shell;

a driving module accommodated in the housing, the driving module including a motor sandwiched between the bottom plate and the top plate;

a telescopic rod component, which is arranged in the shell and comprises a guide screw rod driven by the motor to rotate and a telescopic tube in screw connection transmission with the guide screw rod, wherein the guide screw rod is positioned corresponding to the bearing hole so that the distance between the guide screw rod and the bottom plate is larger than the distance between the guide screw rod and the top plate; and

at least one micro switch installed between the lead screw and the bottom plate and configured corresponding to the lead screw.

2. The asymmetric actuator as recited in claim 1 wherein the telescopic rod assembly comprises a front support secured to the bearing hole, the lead screw is coupled to the front support and capable of rotating relative to the front support, and the center of the lead screw, the center of the front support and the center of the bearing hole are disposed in an overlapping manner.

3. The asymmetric-housing actuator of claim 2 wherein the bearing hole is a circular hole having upper and lower semicircular sections formed from the upper and lower housing halves, respectively.

4. The asymmetric actuator as claimed in claim 1, wherein the bottom plate and the top plate have an inner wall surface and an outer wall surface respectively, the bottom plate has a lower caulking groove penetrating through the inner wall surface to the outer wall surface, the top plate has an upper caulking groove penetrating through the inner wall surface to the outer wall surface, and the top and bottom of the motor are embedded in the upper caulking groove and the lower caulking groove, respectively.

5. The asymmetric-shell actuator of claim 4 wherein the lower housing half and the upper housing half enclose a cavity, and the thickness of the motor is greater than the height of the cavity.

6. The asymmetric actuator as claimed in claim 4, further comprising two waterproof covers, one of which is attached to the outer wall surface of the bottom plate and is sealed in the lower slot, and the other of which is attached to the outer wall surface of the top plate and is sealed in the upper slot.

7. The asymmetric actuator as recited in claim 4 further comprising two waterproof covers, one of the waterproof covers is integrally formed to extend from the outer wall of the bottom plate and is enclosed in the lower slot, and the other of the waterproof covers is integrally formed to extend from the outer wall of the top plate and is enclosed in the upper slot.

8. The asymmetric actuator as recited in claim 1 wherein the drive module further comprises a worm gear driven by the motor, the lead screw intermeshes with and is driven by the worm gear.

9. The asymmetric actuator as recited in claim 1 wherein said telescoping wand assembly further comprises an outer tube, said outer tube being disposed outside of said lead screw and said telescoping tube, said micro-switch being mounted inside said outer tube.

10. The asymmetric actuator of claim 1 in which the end of the bellows remote from the lead screw has a rear abutment.

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