Electric push rod

Abstract

The utility model belongs to the field of electric push rods, and particularly relates to an electric push rod with low cost. The device comprises a shell, a driving assembly and a sliding part, the shell comprises a first shell body, a second shell body, a first end cover and a second end cover, the first shell body and the second shell body are arranged in parallel, a gap is formed between the first shell body and the second shell body, and the two ends of the first shell body and the two ends of the second shell body are inserted into the first end cover and the second end cover in a matched mode. The second end cover is connected with the first shell through a fastener, and the driving assembly is connected to the shell at one end of the first end cover; according to the electric push rod with low cost, the shell is specifically divided into the first shell and the second shell and is formed by rolling the iron-based material, so that the production cost of the shell is reduced, and the cost of the electric push rod is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of electric push rods, and in particular relates to a low-cost electric push rod. Background Art

[0002] An electric push rod is also called a linear drive. Its main working principle is to drive the lead screw to rotate through a motor. A transmission nut is set on the lead screw. When the lead screw rotates, the transmission nut drives the reciprocating motion. A worm gear mechanism is usually used between the motor and the lead screw to achieve transmission.

[0003] The housings of existing electric linear actuators are all integrally formed from aluminum alloy, which has high precision but also high cost. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the present invention designs a low-cost electric push rod. Specifically, the shell is divided into a first shell and a second shell, which are rolled with iron-based materials, reducing the production cost of the shell and thus reducing the cost of the electric push rod.

[0005] The technical solution of the utility model is as follows:

[0006] The electric push rod includes a shell, a drive assembly and a sliding member, characterized in that: the shell includes a first shell, a second shell and a first end cover and a second end cover, the first shell and the second shell are arranged in parallel, and a gap is formed between the two, both ends of the first shell and the second shell are plugged into the first end cover and the second end cover, the second end cover is connected to the first shell by a fastener, and the drive assembly is connected to the shell at one end of the first end cover, the sliding member includes a U-shaped sliding member body, a connecting part is provided on the outer surface of the sliding member body, a transmission part connected to the inner walls on both sides at the same time is provided in the U-shaped groove of the sliding member body, the transmission part divides the U-shaped groove of the sliding member body into a first through hole and a first groove, the sliding member slides on the shell, the first shell slides in the first through hole, the second shell slides in the first groove, the transmission part is located between the first shell and the second shell, and the transmission part is connected to the drive assembly.

[0007] Furthermore, the cross section of the first shell is U-shaped, and the first shell is formed by rolling iron-based material.

[0008] Furthermore, two mounting holes are respectively provided at both ends of the surface of the first shell opposite to the second shell, and two travel switches are also included. The travel switches are connected in the mounting holes, and the two travel switches are connected by a hard conductor. The transmission part is provided with a travel baffle that cooperates with the travel switch.

[0009] Furthermore, the travel switch is fixed in the mounting hole by riveting.

[0010] Furthermore, a gasket is provided between the travel switch and the rivet.

[0011] Furthermore, the travel switch is provided with an elastic clamping foot, which is fixed in the mounting hole.

[0012] Furthermore, it also includes a U-shaped retaining frame, and the two ends of the U-shaped retaining frame respectively extend outward to have fixing ears, and the fixing ears are provided with through holes. A group of fixing columns are provided on the bottom surface of the U-shaped groove of the U-shaped retaining frame, and the fixing columns are plugged into the travel switch.

[0013] Furthermore, the hard conductor is a PCB board, and the travel switch is electrically connected to the PCB board.

[0014] Furthermore, the drive assembly includes a first drive housing, a second drive housing, a drive motor, a drive worm gear, a drive screw and a drive worm. The first drive housing and the second drive housing are connected to form a complete drive housing. The first drive housing and the second drive housing are symmetrically provided with bearing mounting cavities, and the support bearings are arranged in the bearing mounting cavities. The drive worm gear is coaxially arranged with the support bearing and is located on one side of the support bearing. A connecting sleeve is provided on the axis of the drive worm gear. One end of the drive screw is connected to the inner ring of the support bearing, and the drive screw is fitted in the connecting sleeve. A first transmission hole is also provided on the first drive housing. The drive motor is fixedly connected to the outer surface of the first drive housing, and the output shaft of the drive motor passes through the first transmission hole. The drive worm is located in the drive housing and fixedly connected to the output shaft of the drive motor. The drive worm is connected to the drive worm gear.

[0015] Furthermore, the first drive housing and the second drive housing are provided with a covering surface and a first connecting plate, the first connecting plate is provided with a transmission groove, the covering surface covers the surface of the first housing and the second housing and the end face of the covering surface is abutted against one end of the first housing, the first connecting plate is abutted against the other end face of the first housing, the covering surface is provided with a positioning ridge, and the corresponding first housing is provided with a positioning groove, and the positioning ridge is plugged into the positioning groove of the first housing.

[0016] In summary, the present invention has the following beneficial effects:

[0017] The utility model improves the structure of the electric push rod by splitting the shell structure and adopting a split structural design, thereby reducing the structural complexity of the shell, simplifying the structural design, and thus reducing the manufacturing difficulty of each component, thereby reducing the manufacturing cost of the electric push rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1It is a three-dimensional schematic diagram of the utility model;

[0019] Figure 2 This is a three-dimensional schematic diagram of the utility model (excluding the second drive housing);

[0020] Figure 3 is a three-dimensional schematic diagram of the drive assembly (excluding the second drive housing);

[0021] Figure 4 It is a top view schematic diagram of the utility model;

[0022] Figure 5 for Figure 4 A schematic cross-sectional view of AA;

[0023] Figure 6 is a three-dimensional schematic diagram of a sliding member;

[0024] Figure 7 This is the official schematic diagram of the utility model (excluding the second housing and the drive screw);

[0025] Figure 8 is a three-dimensional view of the first drive housing;

[0026] Figure 9 A schematic diagram of a connection structure between the travel switch and the first housing;

[0027] In the figure, 1 is a housing, 10 is a first housing, 100 is a mounting hole, 11 is a second housing, 12 is a first end cover, 13 is a second end cover, 14 is a gap,

[0028] 2 is a driving assembly, 20 is a first driving housing, 200 is a first transmission hole, 21 is a second driving housing, 22 is a driving motor, 23 is a driving worm gear, 230 is a connecting sleeve, 24 is a driving screw, 25 is a driving worm, 26 is a bearing mounting cavity, 27 is a supporting bearing, 2000 is a covering surface, 2001 is a first connecting plate, 2002 is a positioning ridge,

[0029] 3 is a sliding member, 30 is a sliding member body, 31 is a connecting portion, 300 is a U-shaped groove, 32 is a transmission portion, 320 is a transmission shaft, 301 is a first through hole, 302 is a first groove, 321 is a travel baffle,

[0030] 4 is a travel switch, 40 is an elastic foot, 41 is a U-shaped retainer, 410 is a fixed ear, 411 is a fixed column,

[0031] 5 is a hard conductor. DETAILED DESCRIPTION

[0032] The present invention will be further described below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention.

[0033] It should be noted that when an element is referred to as being "disposed on" or "fixed on" another element, it may be directly on the other element or there may be a central element. When an element is referred to as being "fixed on" another element, or "fixedly connected" to another element, they may be fixed in a detachable manner or in a non-detachable manner. When an element is considered to be "connected" or "rotatably connected" to another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right", "upper", "lower" and similar expressions used are for illustrative purposes only and do not represent the only implementation method.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to constrain the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0035] The terms "first", "second", "third" and the like in the present invention do not represent specific quantities and orders, but are only used to distinguish names.

[0036] See also Figures 1 to 8As shown, the electric push rod includes a housing 1, a drive assembly 2 and a sliding member 3. The housing 1 includes a first housing 10, a second housing 11 and a first end cover 12 and a second end cover 13. The first housing 10 and the second housing 11 are arranged in parallel, and a gap 14 is formed between the two. Both ends of the first housing 10 and the second housing 11 are plugged into the first end cover 12 and the second end cover 13. The second end cover 13 is connected to the first housing 10 by a fastener. The drive assembly 2 is connected to the housing 1 at one end of the first end cover 12. The sliding member 3 includes a U-shaped sliding member body 30. A connecting portion 31 is provided on the outer surface of the sliding body 30. The connecting portion is used to Other components that need to be driven by an electric push rod are connected. The U-shaped groove 300 of the sliding body 30 is provided with a transmission part 32 that is connected to the inner walls on both sides at the same time. The specific transmission part includes a hollow transmission shaft 320. The inner wall of the transmission shaft is provided with a transmission thread. Transmission arms are symmetrically provided on both sides of the transmission shaft. The transmission arms are connected to the inner wall of the U-shaped groove. The transmission part 32 divides the U-shaped groove of the sliding body into a first through hole 301 and a first groove 302. The sliding member 3 is slidably fitted on the shell 1. The first shell 10 is slidably fitted in the first through hole 301, and the second shell 11 is slidably fitted in the first groove 302. The transmission part is located between the first shell and the second shell, and the transmission part is connected to the drive assembly.

[0037] The utility model improves the structure of the electric push rod by splitting the shell structure and adopting a split structural design, thereby reducing the structural complexity of the shell, simplifying the structural design, and thus reducing the manufacturing difficulty of each component, thereby reducing the manufacturing cost of the electric push rod.

[0038] The cross-section of the first shell 10 is U-shaped, and the first shell is made of iron-based material by roll forming. The use of roll forming reduces the mold opening cost, thereby reducing the equipment cost. The use of iron-based material processing also further reduces the material cost of the product. In order to further improve the rigidity of the first shell, inward-bent folding edges are respectively provided at the two ends of the first shell, and the folding edges are parallel to the U-shaped bottom surface of the first shell.

[0039] Two mounting holes 100 are respectively provided at both ends of the surface of the first shell 10 opposite to the second shell, and two travel switches 4 are also included. The travel switch 4 is connected in the mounting hole 4. The two travel switches are connected by a hard conductor 5. The transmission part 32 is provided with a travel baffle 321 that cooperates with the travel switch. Since the internal structure of the first shell is simple and the wiring harness cannot be fixed, the utility model adopts a hard conductor to connect the two travel switches to avoid the problem that the flexible wiring harness may be stuck between the slider body and the shell. The travel switch is set to control the stroke of the electric push rod. When the travel switch at one end of the sliding body is triggered, the electric push rod stops and then starts reverse movement.

[0040] The travel switch 4 is fixed in the mounting hole by riveting. In order to facilitate installation, the travel switch of the present invention is fixed to the first housing by riveting, which is quick to install and reliable to fix.

[0041] Furthermore, a gasket is provided between the travel switch 4 and the rivet, which is not shown in the accompanying drawings. Since the force during the riveting process is large, the contact area between the rivet and the connecting foot of the travel switch is unstable, and the connecting foot of the travel switch is easily crushed. Therefore, a gasket is added so that the rivet acts on the gasket, so that the force on the connecting foot can be uniform, avoiding the problem of the connecting foot of the travel switch being crushed.

[0042] See also Figure 9 As shown, the travel switch 4 is provided with an elastic foot 40, which is fixed in the mounting hole. Further, the structure of the travel switch is improved here. The added elastic foot can be directly matched with the mounting hole without riveting, reducing the process steps, and also overcoming the problem of fragile connecting feet in riveting.

[0043] Further, see Figure 6 and Figure 7 As shown, it also includes a U-shaped retainer 41, and both ends of the U-shaped retainer 41 extend outward to form fixing ears 410, and the fixing ears 410 are provided with through holes, and rivets are passed through the through holes to be fixedly connected to the first shell. A group of fixing columns 411 are provided on the bottom surface of the U-shaped groove of the U-shaped retainer 41, and the fixing columns are plugged into the travel switch. The U-shaped retainer is used to fix the travel switch, and there is no need to change the appearance of the travel switch, which reduces the procurement cost of components. At the same time, the indirect fastening method can reduce damage to the travel switch during assembly, thereby ensuring the stability and reliability of the product's factory quality.

[0044] See also Figure 7 As shown, the hard conductor 5 is a PCB board, the travel switch is electrically connected to the PCB board, the PCB board has good rigidity, and the PCB board is parallel to the travel baffle and will not collide with the travel baffle, thereby ensuring the service life of the equipment and reducing equipment failures.

[0045] See also Figure 2 、 Figure 3 、 Figure 5 、 Figure 8As shown, the drive assembly 2 includes a first drive housing 20, a second drive housing 21, a drive motor 22, a drive worm gear 23, a drive screw 24 and a drive worm 25. The first drive housing 20 and the second drive housing 21 are connected to form a complete drive housing. The first drive housing 20 and the second drive housing 21 are symmetrically provided with bearing mounting cavities 26, and the support bearing 27 is arranged in the bearing mounting cavity 26. The drive worm gear 23 is coaxially arranged with the support bearing and is located on one side of the support bearing. A connecting sleeve 230 is provided on the axis of the drive worm gear. One end of the drive screw 24 is connected to the inner ring of the support bearing 27. The driving screw 230 is fitted in the connecting sleeve. The first driving housing 20 is also provided with a first transmission hole 200. The driving motor 22 is fixedly connected to the outer surface of the first driving housing 20, and the output shaft of the driving motor 22 passes through the first transmission hole. The driving worm 25 is located in the driving housing and fixedly connected to the output shaft of the driving motor. The driving worm is connected to the driving worm wheel. Here, the driving motor drives the driving worm to rotate, and the rotation of the driving worm drives the driving worm wheel to rotate, and at the same time drives the driving screw to rotate. The driving screw rotates to drive the sliding part to slide, realize the displacement of the sliding part on the surface of the housing, and then drive the components to be driven to move.

[0046] Further, see Figure 3 and Figure 8 As shown, the first drive shell 20 and the second drive shell 21 are provided with a covering surface 2000 and a first connecting plate 2001, and the first connecting plate 2001 is provided with a transmission groove, and the transmission groove is provided for the driving screw to pass through. The covering surface 2000 covers the surface of the first shell 10 and the second shell 11 and the end face of the covering surface is abutted against one end of the first end cover 12, and the first connecting plate 2001 is abutted against the other end face of the first end cover. The covering surface 2000 is provided with a positioning rib 2002, and the corresponding first shell 10 is provided with a positioning groove 101, and the positioning rib 2002 is plugged into the positioning groove 101 of the first shell 10. The positioning rib, the end of the covering surface and the first connecting plate realize the fixation of the drive assembly and the shell, and there will be no problem of back and forth movement, which improves the silent effect of the equipment and reduces the generation of abnormal noise.

[0047] In summary, the present invention has the following beneficial effects:

[0048] The utility model improves the structure of the electric push rod by splitting the shell structure and adopting a split structural design, thereby reducing the structural complexity of the shell, simplifying the structural design, and thus reducing the manufacturing difficulty of each component, thereby reducing the manufacturing cost of the electric push rod.

[0049] Based on the described embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work shall fall within the scope of protection of the present invention.

Claims

1. An electric push rod comprising a housing, a drive assembly, and a sliding member, characterized in that: The shell includes a first shell, a second shell and a first end cover and a second end cover. The first shell and the second shell are arranged in parallel, and a gap is formed between the two. Both ends of the first shell and the second shell are plugged into the first end cover and the second end cover. The second end cover is connected to the first shell by a fastener. The drive assembly is connected to the shell at one end of the first end cover. The sliding part includes a U-shaped sliding part body. A connecting part is provided on the outer surface of the sliding part body. A transmission part connected to the inner walls on both sides is provided in the U-shaped groove of the sliding part body. The transmission part divides the U-shaped groove of the sliding part body into a first through hole and a first groove. The sliding part is slidably fitted on the shell. The first shell is slidably fitted in the first through hole, and the second shell is slidably fitted in the first groove. The transmission part is located between the first shell and the second shell, and the transmission part is connected to the drive assembly.

2. The electric linear actuator according to claim 1, wherein: The cross section of the first shell is U-shaped, and the first shell is made of iron-based material by rolling.

3. The electric push rod according to any one of claims 1 or 2, characterized in that: Two mounting holes are respectively provided at both ends of the surface of the second shell opposite to the first shell, and two travel switches are also included. The travel switches are connected in the mounting holes. The two travel switches are connected by a hard conductor. The transmission part is provided with a travel baffle that cooperates with the travel switch.

4. The electric linear actuator according to claim 3, wherein: The travel switch is riveted and fixed in the mounting hole.

5. The electric linear actuator according to claim 4, characterized in that: A gasket is provided between the travel switch and the rivet.

6. The electric push rod according to claim 3, characterized in that : The travel switch is provided with an elastic clamping foot, which is fixed in the mounting hole.

7. The electric linear actuator according to claim 3, wherein: It also includes a U-shaped retainer, with fixing ears extending outward at both ends of the U-shaped retainer, and through holes provided on the fixing ears. A group of fixing columns are provided on the bottom surface of the U-shaped groove of the U-shaped retainer, and the fixing columns are plugged into the travel switch.

8. The electric linear actuator according to claim 3, wherein: The hard conductor is a PCB board, and the travel switch is electrically connected to the PCB board.

9. The electric linear actuator according to claim 1, wherein: The drive assembly includes a first drive housing, a second drive housing, a drive motor, a drive worm gear, a drive screw and a drive worm. The first drive housing and the second drive housing are connected to form a complete drive housing. The first drive housing and the second drive housing are symmetrically provided with bearing mounting cavities, and the support bearing is arranged in the bearing mounting cavity. The drive worm gear is coaxially arranged with the support bearing and is located on one side of the support bearing. A connecting sleeve is provided on the axis of the drive worm gear. One end of the drive screw is connected to the inner ring of the support bearing, and the drive screw is fitted in the connecting sleeve. A first transmission hole is also provided on the first drive housing. The drive motor is fixedly connected to the outer surface of the first drive housing, and the output shaft of the drive motor passes through the first transmission hole. The drive worm is located in the drive housing and fixedly connected to the output shaft of the drive motor. The drive worm is connected to the drive worm gear.

10. The electric linear actuator according to claim 9, characterized in that: The first drive housing and the second drive housing are provided with a covering surface and a first connecting plate, and a transmission groove is provided on the first connecting plate. The covering surface covers the surfaces of the first housing and the second housing, and the end face of the covering surface is abutted against one end of the first housing. The first connecting plate is abutted against the other end face of the first housing. The covering surface is provided with a positioning ridge, and the corresponding first housing is provided with a positioning groove, and the positioning ridge is plugged into the positioning groove of the first housing.

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