CN213243722U

CN213243722U - Linear device for reducing noise

Info

Publication number: CN213243722U
Application number: CN202021510395.7U
Authority: CN
Inventors: 亨利·皮尔茨
Original assignee: Johnson Electric International AG
Current assignee: Johnson Electric International AG; Johnson Electric Guangdong Co Ltd
Priority date: 2019-08-17
Filing date: 2020-07-24
Publication date: 2021-05-18
Anticipated expiration: 2030-07-24
Also published as: DE102019122140A1

Abstract

The utility model provides a noise reduction's linear device, it includes actuating lever, casing lid, stator and rotor. The shell cover is provided with a through hole. The rotor includes a threaded shaft. The threaded shaft is detachably connected with the actuating rod and guides the actuating rod to do axial linear movement along the through hole. One end of the actuating lever is formed with a nut portion matching the threaded shaft, and the middle portion thereof includes at least one fork arm for preventing the actuating lever from rotating. The linear device further comprises an elastic element which is arranged between the fork arm and the perforation and is arranged on the shell cover. The outer diameter of the elastic member is larger than the inner diameter of the through hole so that the elastic member elastically abuts against the inner wall of the through hole, thereby absorbing noise.

Description

Linear device for reducing noise

Technical Field

The utility model relates to a linear device, concretely relates to noise reduction's linear device.

Background

The existing linear device is internally provided with a linear stepping motor which drives a plurality of circulating stepping movements. These cyclical step movements generate a large amount of vibrations which are transmitted to the threaded spindle and directly to the linearly movable actuating rod via the spindle nut. Since the actuating rod must be supported and guided in the region of the housing of the linear device through which it passes, vibrations are also transmitted to the housing and other components, which inevitably generates a large disturbing noise.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention is directed to a noise reduction linear device that can solve the above problems.

Therefore, the utility model provides a noise reduction's linear device, linear device includes actuating lever, casing lid, stator and rotor, the casing is covered and has been seted up the perforation, the rotor is including the screw shaft, the screw shaft with actuating lever detachable connects, and guides the actuating lever is along perforating to axial linear motion, an end of actuating lever is formed with the nut portion that matches with the screw shaft, and its middle part is used for preventing including at least one forked arm the actuating lever is rotatory, linear device still including set up at forked arm with install the elastic element who covers in the casing between the perforation, the external diameter of elastic element is greater than fenestrate internal diameter so that elastic element elasticity is contradicted fenestrate the inner wall to the noise absorption.

In some embodiments, the resilient element is a resilient anti-rotation element, the resilient anti-rotation element being integrally formed.

In some embodiments, two prongs pass through the perforations and are sealingly secured within the housing cover by the resilient element.

In some embodiments, the resilient element is a resilient anti-rotation element that is assembled from multiple components.

In some embodiments, the inner surface of the elastic element is formed with at least one circumferential sealing lip facing the fork arms.

In some embodiments, the linear device further comprises at least one sealing ring interposed between the fork arms and the elastic element.

In some embodiments, the sealing lip or the sealing ring is one of wedge-shaped, flat wedge-shaped, semi-circular, triangular, or rectangular.

In some embodiments, the resilient element and the sealing lip or ring are made of two or more different materials.

The utility model discloses a linear device has absorbed the vibration that actuating lever linear movement produced through elastic element, has reduced linear device's noise, has promoted linear device's quality.

Drawings

Fig. 1 is a cross-sectional view of a linear device in an embodiment of the present invention.

FIG. 2 is a detailed cross-sectional view of a multi-part resilient anti-rotation element having a sealing ring in one embodiment.

Figure 3 is a detailed cross-sectional view of a single-component resilient anti-rotation element with a seal ring in one embodiment.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments, so that the technical solutions and the advantages thereof will be more clearly understood. It is to be understood that the drawings are provided for purposes of illustration and description only and are not intended as a definition of the limits of the invention, but the dimensions shown in the drawings are for convenience and are not to be taken as limiting the scale.

Figure 1 shows a cross-sectional view of a linear device of the present invention. In this embodiment, the linear device is a linear stepping motor. The linear device comprises an actuating rod 7, a housing cover 3, a stator 1 and a rotor 4. The housing cover 3 closes the motor toward the linear device driven side D. The shell cover 3 is provided with a through hole 9. The rotor 4 comprises a threaded shaft 5. The threaded shaft 5 is detachably connected to the actuating rod 7 and guides the actuating rod 7 to perform axial linear movement along the through hole 9. An end of the actuating rod 7 is formed with a nut part 6 matched with the threaded shaft 5 so as to convert the rotational motion of the rotor 4 into the linear motion of the actuating rod 7. In this embodiment, the threaded shaft 5 can guide at least one, two or more longitudinally movable actuating rods 7. The actuating lever 7 comprises at least one fork arm 8 in the middle for limiting the rotational movement of the actuating lever 7. The housing cover 3 also has a convexly formed housing cover flange 14. The housing cover flange 14 supports the actuating rod 7 and guides the actuating rod 7 in a longitudinally movable manner. The actuating rod 7 is connected with the threaded shaft 5 and directly extends to the outside of the side D. A lead screw is formed on the threaded shaft 5, and the nut portion 6 is guided by the lead screw. In order to prevent the nut part 6 from co-rotating due to friction with the threaded shaft 5 when rotating, it is preferred to arrange a central transverse rib (not shown) in the through hole 9 of the housing cover 3 to divide the through hole into two cut-outs, preventing rotation of the actuating rod 7. Preferably forked, i.e. split in the middle. In the present embodiment, the fork arm 8 is formed by two fork branches, for example, in the shape of a circular arc segment in cross section. As the rotor 4 rotates, the nut part 6 performs a linear movement on the threaded shaft 5, the nut part 6 not being able to rotate together with the threaded shaft due to the fork arms 8 engaging with the central transverse rib in the perforation 9. In this embodiment, if there is only one fork arm 8, it is not circular, but preferably comprises two parallel flat branches, and the two cuts of the perforation are also not circular, which should match the shape of the branches of the fork arm, so that the branches of the fork arm can pass through the two cuts and so that the fork arm is not rotatable in linear movement. The outer end of the fork arm 8 extending out of the motor can be coupled with an external load element by means of coupling or the like.

The linear device further comprises an elastic element 11 arranged between the fork arms 8 and the cut-out of the perforation 9 and mounted on the housing cover 3. The outer diameter of the elastic member 11 is larger than the inner diameter of the through hole 9 so that the elastic member 11 elastically abuts against the inner wall of the through hole 9, thereby absorbing vibration generated when the nut portion 6 of the actuating lever 7 acts on the threaded shaft 5 and vibration generated when the actuating lever 7 linearly moves, thereby achieving an effect of reducing noise. In the present embodiment, the elastic element 11 is an elastic anti-rotation element 10. The resilient anti-rotation element 10 may be formed as one piece or may be formed from multiple pieces.

Furthermore, due to the elasticity of the elastic element 11 or the elastic anti-rotation element 10, a stiff contact of the fork arms 8 with the central transverse rib formed of metal is prevented, vibrations are reduced, while due to the linear movement a certain clearance is required, whereas the current arrangement of the elastic element allows the requirements of the clearance to be met, and due to the elastic properties the linear movement can generate a low friction, so that the generation of noise can be reliably eliminated.

Further, the linear device also comprises at least one sealing ring 13. The sealing ring 13 is inserted between the spring element 11 and the fork arm 8, as a result of which vibrations which are transmitted directly via the nut part 6 to the longitudinally movable actuating rod 7 can be damped, so that the noise generated is not transmitted to the housing cover 3 and thus also to the stator housing 2. The pre-stress is adjusted so that the linear stepper motor does not prematurely wear or overheat even if the required linear movement is performed at low power. At the same time, the elastic member 11 or the elastic rotation preventing member 10 also seals the inside of the linear stepping motor sufficiently from the outside.

Fig. 2 shows a detailed sectional view of a multi-part elastic anti-rotation element with a sealing ring, the anti-rotation element 10 having a sealing ring 13 built in under a predetermined prestress. In this embodiment, the sealing ring 13 may be rectangular, annular, or other different shapes. Said anti-rotation element 10 is arranged at an inner ring 15 arranged within the housing cover 3 to prevent the fork arm 8 of the actuating lever 7 from slipping out during linear movement. The anti-rotation element 10 is formed with a corresponding protrusion 19 (i.e. the protrusion has a diameter greater than the inner diameter of the housing cover inner ring 15). For assembly reasons, the anti-rotation element 10 is V-shaped and tapered at its inner end in cross section towards the rotor 4. On the outside of the anti-rotation element 10, the anti-rotation element 10 seals the through-opening 9 by means of a collar 18 formed thereon snapping against the outer surface of the housing cover 3. In this way, the flange 18 and the inner ring 15 fix the anti-rotation element 15 at the perforation 9.

Figure 3 illustrates a detailed cross-sectional view of a single-component resilient anti-rotation element with a sealing ring in one embodiment. In the exemplary embodiment, the sealing ring 13 is replaced by a circumferential flat sealing lip 12 of the same material as the anti-rotation element 10. Here, the pre-set prestress is generated by a circumferential sealing lip 12, which circumferential sealing lip 12 acts on the outer surface of the two fork-shaped legs 8 of the actuating rod 7, which can generate a better clamping force than an elastic element and can provide a better noise absorption. At the same time, the sealing lip seals the interior of the linear stepping motor against any contamination, in particular against the ingress of gas. The anti-rotation element 10 does not rest on the cylindrical surface of the bore 9 of the housing cover flange 14 or is supported. Here, any additional support can also be arranged, for example formed as a circumferential ring. As already mentioned, the anti-rotation element 10 can also be fixed by the inside of a cutout formed in the housing cover inner ring 15 or by a groove formed in the housing cover.

In the present embodiment, depending on the structural size of the motor, the preset size of the elastic element 11 or the anti-rotation element 10 requires a corresponding prestress, and the shape of the sealing lip 12 or the sealing ring 13 may be wedge-shaped, flat wedge-shaped, semicircular, triangular or rectangular.

In the present embodiment, in the means for reducing noise, the elastic element 11 or the anti-rotation element 10 and the sealing lip 12 or the sealing ring 13 formed may be made of two or more different materials.

The utility model can absorb better vibration noise because the elastic element or the elastic anti-rotation element can elastically deform; furthermore, the elastic element or elastic anti-rotation element can act as a torsion spring, reducing the guide cross section of the fork arms and thus reducing the size of the actuating rod 7, thus allowing the entire actuating rod to perform a precise axial linear movement, with only a slight deviation from the axis during its linear movement.

The above description is only a preferred embodiment of the present invention, the protection scope of the present invention is not limited to the above listed embodiments, any person skilled in the art can obviously obtain simple changes or equivalent substitutions of the technical solutions within the technical scope of the present invention.

Claims

1. A noise-reducing linear device comprising an actuating rod, a housing cover, a stator, and a rotor, the housing cover having a through-hole formed therein, the rotor including a threaded shaft that is detachably coupled to the actuating rod and guides the actuating rod to linearly move axially along the through-hole, one end of the actuating rod being formed with a nut portion that is fitted to the threaded shaft, and an intermediate portion of the actuating rod including at least one fork arm for restricting a rotational movement of the actuating rod, the noise-reducing linear device comprising: the linear device also comprises an elastic element which is arranged between the fork arm and the perforation and is arranged on the shell cover, and the outer diameter of the elastic element is larger than the inner diameter of the perforation so that the elastic element elastically props against the inner wall of the perforation, thereby absorbing vibration and reducing noise.

2. The linear noise reduction device of claim 1, wherein: the elastic element is an elastic anti-rotation element which is integrally formed.

3. The linear noise reduction device of claim 1, wherein: two fork arms pass through the through hole and are fixed in a sealing manner in the shell cover through the elastic element.

4. The linear noise reduction device of claim 1, wherein: the elastic element is an elastic anti-rotation element which is formed by combining a plurality of components.

5. The linear noise reduction device of claim 1, wherein: the inner surface of the elastic element is formed with at least one circumferential sealing lip facing the fork arms.

6. The noise reducing linear device of claim 5, wherein: the linear device further comprises at least one sealing ring inserted into the inner surface of the elastic element.

7. The linear noise reduction device of claim 1, wherein: the cross section of the elastic element is V-shaped towards the direction of the nut part, and the cross section of the elastic element is gradually reduced.

8. The noise reducing linear device of claim 6, wherein: the sealing lip or the sealing ring is one of wedge-shaped, flat wedge-shaped, semi-circular, triangular or rectangular.

9. The linear noise reduction device of claim 1, wherein: the elastic element is fixed by an inner ring arranged in at least one shell cover or a groove arranged in the shell cover.