A linear actuator with convenient worm gear disassembly and assembly

Abstract

The present invention discloses a linear actuator for convenient assembling and disassembling of worm gears, belonging to the field of linear transmission technology, comprising a housing, a transmission worm gear, a rotating screw and a transmission nut, wherein the transmission worm gear drives the rotating screw to rotate, and the rotating screw drives the transmission nut to move axially along the rotating screw, the linear actuator is provided with an end positioning sleeve on one side of the end of the rotating screw, the rotating screw is also provided with an axial positioning member, the transmission worm gear is axially positioned between the end positioning sleeve and the axial positioning member, and the housing is provided with a first positioning groove and a second positioning groove for positioning the end positioning sleeve and the axial positioning member respectively. The advantage of the present invention is that it is convenient to replace the transmission worm gear of the linear actuator.

Description

[Technical field]

[0001] The invention relates to a linear actuator for conveniently disassembling and assembling a worm gear, belonging to the technical field of linear transmission. [Background technology]

[0002] Linear actuators, also known as electric push rods, are widely used in furniture, medical equipment, solar power generation and other fields. Their main structure includes a drive motor, a transmission worm, a transmission worm wheel, a rotating screw and a transmission nut. The working principle is that the drive motor drives the transmission worm to rotate, the transmission worm engages with the transmission worm wheel to drive the transmission worm wheel to rotate, the rotation of the transmission worm wheel drives the rotating screw to rotate, and the rotation of the rotating screw drives the transmission nut to move axially. The transmission nut is generally connected with an inner tube to realize the telescopic movement of the inner tube.

[0003] In traditional electric linear actuators, the transmission worm gear is integrated with the rotating lead screw by riveting or threading, or is integrated with the motor movement by a retaining spring. It is troublesome to replace the transmission worm gear when it is found to be defective during assembly or when it needs to be replaced due to fatigue wear. [Summary of the invention]

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a linear actuator with a worm gear that is easy to disassemble and assemble, so that it is more convenient to replace the transmission worm gear of the linear actuator.

[0005] To solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A linear actuator for easily disassembling and assembling a worm gear comprises a housing, a transmission worm gear, a rotating screw and a transmission nut. The transmission worm gear drives the rotating screw to rotate, and the rotation of the rotating screw drives the transmission nut to move axially along the rotating screw. The linear actuator is provided with an end positioning sleeve on one side of the end of the rotating screw, and the rotating screw is also provided with an axial positioning piece. The transmission worm gear is axially positioned between the end positioning sleeve and the axial positioning piece, and the housing is provided with a first positioning groove and a second positioning groove for respectively positioning the end positioning sleeve and the axial positioning piece.

[0007] The beneficial effects of the present invention are as follows:

[0008] In the present invention, the installation method of the transmission worm wheel is improved. In the present invention, the transmission worm wheel is installed on one side of the end of the rotating screw rod, and the axial positioning is performed by the end positioning sleeve and the axial positioning member in the axial direction. When installing, the transmission worm wheel is first inserted, and then the end positioning sleeve is positioned, so that the assembly of the transmission worm wheel can be realized. When disassembling and replacing, only the end positioning sleeve needs to be removed, and the transmission worm wheel can be axially moved out, which is very convenient. This makes it very convenient to replace the transmission worm wheel in the assembly process or in the use process, once the transmission worm wheel is defective or has excessive wear.

[0009] In addition, in the present invention, the end positioning sleeve and the axial positioning member are positioned by providing a first positioning groove and a second positioning groove inside the outer shell. With this positioning method, the user only needs to disassemble the outer shell to release the positioning of the end positioning sleeve or the axial positioning member. When the axial positioning of the end positioning sleeve or the axial positioning member is released, the user can remove it very conveniently.

[0010] Preferably, the end positioning sleeve is provided with an extension column, the center of the transmission worm gear is provided with an insertion hole, and the extension column is inserted into the insertion hole.

[0011] Preferably, a spline sleeve is provided between the rotating screw and the transmission worm wheel, the spline sleeve comprises an inner end and an outer end, the inner end is mounted on the rotating screw, the outer end extends out of the end of the rotating screw, and the transmission worm wheel is mounted on the outer end.

[0012] Preferably, a containing cavity is provided in the transmission worm wheel, the outer end of the spline sleeve is at least partially contained in the containing cavity, and an insertion hole is provided in the center of the transmission worm wheel, which is communicated with the containing cavity.

[0013] Preferably, the axial positioning member comprises a bearing, the outer ring of the bearing is axially positioned with the second positioning groove, and the inner ring of the bearing is axially positioned with the transmission worm gear.

[0014] Preferably, a spline sleeve is provided between the rotating screw and the transmission worm wheel, the bearing sleeve is mounted on the spline sleeve, and is axially positioned by the spline sleeve and the transmission worm wheel.

[0015] Preferably, the spline sleeve includes a limiting step, and the end of the transmission worm wheel is limited by the limiting step.

[0016] Preferably, a bearing pad is provided on the rotating screw, and the bearing is axially positioned between the bearing pad and the spline sleeve.

[0017] Preferably, the housing comprises an upper shell and a lower shell, and the first positioning groove and / or the second positioning groove is formed by splicing the upper shell and the lower shell.

[0018] Preferably, the linear actuator further comprises a tail pull, and a third positioning groove for positioning the tail pull is provided in the housing.

[0019] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings.

Brief Description of the Drawings

[0020] The present invention will be further described below in conjunction with the accompanying drawings:

[0021] Figure 1is an overall schematic diagram of a linear actuator according to a first embodiment of the present invention;

[0022] Figure 2 Schematic diagram of the internal structure of a linear actuator according to Embodiment 1 of the present invention;

[0023] Figure 3 It is a schematic diagram of an exploded view of a linear actuator in a first embodiment of the present invention;

[0024] Figure 4 Schematic diagram of the internal structure of the upper housing in the linear actuator according to the first embodiment of the present invention;

[0025] Figure 5 It is a partial cross-sectional schematic diagram of a linear actuator according to an embodiment of the present invention. [Specific implementation method]

[0026] The technical solutions of the embodiments of the present invention are explained and described below in conjunction with the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the present invention.

[0027] In the following description, terms such as "inside", "outside", "up", "down", "left", "right", etc. that indicate orientation or position relationship are based on the orientation or position relationship shown in the drawings and are only for the convenience of describing the embodiments and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention.

[0028] Embodiment 1:

[0029] like Figures 1 to 5 As shown, this embodiment shows a linear actuator, including a housing 1, a transmission worm wheel 21, a rotating screw 22 and a transmission nut 23. The transmission worm wheel 21 drives the rotating screw 22 to rotate, and the rotating screw 22 drives the transmission nut 23 to move axially along the rotating screw 22. In addition, the linear actuator also includes an outer tube 13 and an inner tube 14. The transmission nut 23 is fixed relative to the inner tube 14, and the housing 1 is fixed relative to the outer tube 13. When the transmission nut 23 moves axially, it drives the inner tube 14 to move relative to the outer tube 13. The linear actuator is provided with an end positioning sleeve 3 on one side of the end of the rotating screw 22, and the rotating screw 22 is also provided with an axial positioning member 4. The transmission worm wheel 21 is axially positioned between the end positioning sleeve 3 and the axial positioning member 4, and the housing 1 is provided with a first positioning groove 101 and a second positioning groove 102 for positioning the end positioning sleeve 3 and the axial positioning member 4 respectively.

[0030] In this embodiment, the installation method of the transmission worm wheel 21 is improved. The transmission worm wheel 21 is installed on one side of the end of the rotating screw 22. At the same time, the axial positioning is performed by the end positioning sleeve 3 and the axial positioning member 4 in the axial direction. When installing, the transmission worm wheel 21 is first inserted, and then the end positioning sleeve 3 is positioned, so that the assembly of the transmission worm wheel 21 can be realized. When disassembling and replacing, only the end positioning sleeve 3 needs to be removed, and the transmission worm wheel 21 can be axially moved out, which is very convenient. This makes it very convenient to replace the transmission worm wheel 21 in the assembly process or in the use process, once the transmission worm wheel 21 is defective or excessively worn.

[0031] In addition, in the present embodiment, the end positioning sleeve 3 and the axial positioning member 4 are positioned by providing a first positioning groove 101 and a second positioning groove 102 inside the outer shell 1. With this positioning method, the user only needs to disassemble the outer shell 1 to release the positioning of the end positioning sleeve 3 or the axial positioning member 4. When the axial positioning of the end positioning sleeve 3 or the axial positioning member 4 is released, the user can remove it very conveniently.

[0032] In addition, in order to facilitate disassembly, the housing 1 of this embodiment includes an upper shell 11 and a lower shell 12, and the first positioning groove 101 and / or the second positioning groove 102 are formed by splicing the upper shell 11 and the lower shell 12. In this embodiment, the upper shell 11 and the lower shell 12 are just two half shells, and the first positioning groove 101 and the second positioning groove 102 are also divided into two half grooves respectively. When disassembly is required, it is only necessary to remove the upper shell 11, and then lift the end of the rotating screw 22 upwards, so that the end positioning sleeve 3 can be removed from the end of the rotating screw 22, so that the transmission worm gear 21 can also be taken out axially. This disassembly method is very convenient. When installing, it is also only necessary to install the transmission worm gear 21 from the end of the rotating screw 22, and then install the end positioning sleeve 3. Finally, after the upper shell 11 and the lower shell 12 are spliced, the end positioning sleeve 3 is positioned to achieve installation.

[0033] In order to facilitate the disassembly and assembly of the end positioning sleeve 3, the end positioning sleeve 3 in this embodiment is provided with an extension cylinder 31, and the center of the transmission worm wheel 21 is provided with an insertion hole 211, and the extension cylinder 31 is inserted into the insertion hole 211. Firstly, the insertion method can make the insertion of the extension cylinder 31 and the transmission worm wheel 21 more convenient, and at the same time, the extension cylinder 31 and the transmission worm wheel 21 can achieve the center positioning, so that the concentricity between the end positioning sleeve 3 and the transmission worm wheel 21 is better, so that it can better cooperate with the first positioning groove 101 for positioning.

[0034] In order to reduce the influence of the swing of the rotating screw 22 on the transmission worm wheel 21, a spline sleeve 5 is provided between the rotating screw 22 and the transmission worm wheel 21 in this embodiment, and the spline sleeve 5 includes an inner end and an outer end, the inner end is mounted on the rotating screw 22, and the outer end extends out of the end of the rotating screw 22, and the transmission worm wheel 21 is mounted on the outer end. Firstly, the spline sleeve 5 can realize the synchronous rotation between the transmission worm wheel 21 and the rotating screw 22, and secondly, only part of the spline sleeve 5 in this embodiment is sleeved on the rotating screw 22, and part of it is located outside the end of the rotating screw 22, which makes the rotating screw 22 with a longer stroke have a relatively small influence on the transmission worm wheel 21 if a certain degree of swing occurs.

[0035] In order to make the structure more compact, a receiving chamber 212 is provided in the transmission worm wheel 21, and the outer end of the spline sleeve 5 is at least partially received in the receiving chamber 212. A plug-in hole 211 is provided in the center of the transmission worm wheel 21, and the plug-in hole 211 is connected with the receiving chamber 212. The plug-in hole 211 is arranged to be connected with the receiving chamber 212, so that when the extension column 31 on the end positioning sleeve 3 is inserted into the plug-in hole 211, it can be partially received in the receiving chamber 212, thereby making the axial length shorter and the structure more compact. In order to extend the insertion depth of the extension column 31 in this embodiment, the plug-in hole 211 extends a distance toward the rotating screw 22.

[0036] In this embodiment, the axial positioning member 4 preferably includes a bearing, the outer ring of the bearing is axially positioned with the second positioning groove 102, and the inner ring of the bearing is axially positioned with the transmission worm gear 21. With such a design, the bearing in this embodiment not only plays a role in reducing the rotation friction of the rotating screw 22, but also plays a role in axially positioning the transmission worm gear 21.

[0037] In this embodiment, the bearing is preferably mounted on the spline sleeve 5, and is axially positioned with the transmission worm wheel 21 through the spline sleeve 5. Therefore, the bearing does not directly contact the transmission worm wheel 21, reducing the wear on the transmission worm wheel 21. In terms of specific structure, the spline sleeve 5 includes a limiting step 51, and the end of the transmission worm wheel 21 is limited by the limiting step 51. Figure 5 For example, the left end face of the inner ring of the bearing is limited by the limiting step 51, and the right end face of the inner ring of the bearing is limited by a bearing pad 6. Therefore, the bearing is limited in the axial direction by the limiting step 51 and the bearing pad 6, and the outer ring of the bearing is axially positioned by the second positioning groove 102.

[0038] Combination Figure 2 and Figure 3As shown, the linear actuator further includes a tail pull 7, and a third positioning groove 103 for positioning the tail pull 7 is provided in the housing 1. The tail pull 7 is also arranged to be positioned using the third positioning groove 103, and such a design is conducive to the convenient removal of the transmission worm gear 21, because after the tail pull 7 is also removed, it will be more convenient to remove the end positioning sleeve 3 and the transmission worm gear 21 to the side of the tail pull 7.

[0039] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modification that does not deviate from the functional and structural principles of the present invention will be included in the scope of the claims.

Claims

1. A linear actuator with a worm gear that is easy to disassemble and assemble, comprising a housing, a transmission worm gear, a rotating screw and a transmission nut, wherein the transmission worm gear drives the rotating screw to rotate, and the rotating screw drives the transmission nut to move along the axial direction of the rotating screw, characterized in that: The linear actuator is provided with an end positioning sleeve on one side of the end of the rotating screw, and the rotating screw is also provided with an axial positioning piece, the transmission worm wheel is axially positioned between the end positioning sleeve and the axial positioning piece, and the housing is provided with a first positioning groove and a second positioning groove for positioning the end positioning sleeve and the axial positioning piece respectively; the linear actuator also includes a tail pull, and the housing is provided with a third positioning groove for positioning the tail pull; the end positioning sleeve is provided with an extension cylinder, and the center of the transmission worm wheel is provided with an insertion hole, and the extension cylinder is inserted in the insertion hole; a spline sleeve is provided between the rotating screw and the transmission worm wheel, and the spline sleeve includes an inner side end and an outer side end, the inner side end is mounted on the rotating screw, and the outer side end extends out of the end of the rotating screw, and the transmission worm wheel is mounted on the outer side end; a receiving chamber is provided in the transmission worm wheel, and the outer side end of the spline sleeve is at least partially accommodated in the receiving chamber, and the center of the transmission worm wheel is provided with an insertion hole, and the insertion hole is communicated with the receiving chamber, and when the extension cylinder on the end positioning sleeve is inserted into the insertion hole, it is partially accommodated in the receiving chamber.

2. The linear actuator with convenient detachable worm gear as claimed in claim 1, characterized in that: The axial positioning member comprises a bearing, the outer ring of the bearing is axially positioned with the second positioning groove, and the inner ring of the bearing is axially positioned with the transmission worm gear.

3. The linear actuator with convenient detachable worm gear as claimed in claim 2, characterized in that: A spline sleeve is provided between the rotating screw and the transmission worm wheel, the bearing sleeve is mounted on the spline sleeve, and is axially positioned by the spline sleeve and the transmission worm wheel.

4. The linear actuator with convenient detachable worm gear as claimed in claim 3, characterized in that: The spline sleeve comprises a limiting step, and the end of the transmission worm wheel is limited by the limiting step.

5. The linear actuator with convenient detachable worm gear as claimed in claim 3, characterized in that: A bearing pad is provided on the rotating screw, and the bearing is axially positioned between the bearing pad and the spline sleeve.

6. The linear actuator with convenient detachable worm gear as claimed in claim 1, characterized in that: The housing comprises an upper shell and a lower shell, and the first positioning groove and / or the second positioning groove are formed by splicing the upper shell and the lower shell.

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