Electric push rod waterproof and dustproof structure and electric push rod

Abstract

The utility model discloses an electric push rod waterproof and dustproof structure and an electric push rod, the waterproof and dustproof structure comprises a guide sleeve and a dustproof cover, the guide sleeve is inserted in the end portion of an electric push rod housing and is sleeved on a driving rod of the electric push rod, and the inner wall of the outer end of the guide sleeve is provided with an annular sealing member sealed with the driving rod; the dustproof cover covers the outer end of the guide sleeve and is fixedly connected with the end of the electric push rod shell, a soft elastic waterproof cover is arranged on the dustproof cover in a rubber coating and injection molding mode, and an annular sealing body matched with the peripheral wall of the driving rod in a sealing mode is formed on the inner wall of a center hole of the waterproof cover. The electric push rod is provided with the waterproof and dustproof structure, so that the electric push rod is good in waterproof and dustproof performance, convenient to produce and low in reject ratio.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of electric push rods, in particular to an electric push rod waterproof and dustproof structure and an electric push rod. BACKGROUND

[0002] The electric push rod, also known as a linear motor, is a driving device capable of converting rotary motion into linear reciprocating motion, which is widely used in various fields, such as automobile seat backrest lifting mechanisms, vehicle electric lifting sunshade devices, solar panel rotating adjustment mechanisms, furniture equipment, etc. The electric push rod of the related art generally comprises a shell, a driving assembly and a transmission assembly. The motor in the driving assembly provides power, and the transmission assembly has an extendable driving rod. The motor of the driving assembly transmits power to the transmission assembly, so that the driving rod of the transmission assembly moves linearly.

[0003] The electric push rod of the related art, especially the electric push rod applied to vehicles and outdoor equipment, needs to have good waterproof performance to prevent rainwater from entering the linear motor through the gap between the driving rod and the shell, causing the transmission assembly inside the linear motor to rust and age, etc., affecting its service life. Therefore, the linear motor of the related art generally has a sealing waterproof structure of the driving rod at the end cover of the shell. For example, the prior Chinese patent application of the present applicant with the publication number CN221009910U and the name of a waterproof linear motor, which has an end cover connected to the end of the motor housing and sleeved on the driving rod. The end cover includes a connecting part inserted into the housing and a flange part arranged on the outer side of the housing. The connecting part and the flange part are integrally injection molded, and at least part of the flange part is injection molded with a soft elastic waterproof cover. Two annular sealing bodies are formed on the inner wall of the center hole of the waterproof cover, which are axially spaced and sealingly cooperate with the outer peripheral wall of the driving rod. The two annular sealing bodies form two lip-shaped sealing structures that seal the driving rod, so the waterproof and dustproof performance is good.

[0004] The waterproof sealing structure of the electric push rod or linear motor of the above-mentioned related art has the following defects in actual production process: since the connecting part of the end cover inserted into the motor housing and the flange part located on the outer side of the motor housing are integrally injection molded, and the two lip-shaped sealing bodies are formed on the elastic waterproof cover injection molded on the flange; therefore, the mold opening is difficult, and the two lip-shaped sealing bodies are easily adhered together during the injection molding, resulting in high rejection rate, material waste and high production cost. UTILITY MODEL CONTENT

[0005] The technical problem to be solved by the present application is to overcome the defects of the above-mentioned related art, and to provide an electric push rod waterproof and dustproof structure which not only has good waterproof and dustproof performance, but also is convenient to produce and has low rejection rate.

[0006] The technical solution of the present application is to provide a waterproof and dustproof structure of an electric trolley, which has the following structure

[0007] A guide sleeve is inserted into the end of the electric trolley shell and is sleeved on the driving rod of the electric trolley, and an annular sealing element is arranged on the inner wall of the outer end of the guide sleeve and seals the driving rod.

[0008] A dust cover is arranged on the outer end of the guide sleeve and is fixedly connected to the end of the electric trolley shell, a soft and elastic waterproof cover is formed on the dust cover by rubber injection molding, and an annular sealing body is formed on the inner wall of the central hole of the waterproof cover and seals the outer peripheral wall of the driving rod.

[0009] In some embodiments, an annular step is arranged on the inner wall of the guide sleeve and penetrates the end face of the outer end of the guide sleeve, the annular sealing element is arranged on the annular step, and when the dust cover is arranged on the outer end of the guide sleeve, the annular sealing element is axially limited on the annular step.

[0010] In some embodiments, the waterproof cover has a rubber body arranged on one end of the dust cover close to the electric trolley shell, and the rubber body is sealingly attached to the outer end face of the electric trolley shell.

[0011] In some embodiments, the annular sealing body extends axially and outwardly, and at least a portion of the annular sealing body protrudes from the outer end face of the waterproof cover.

[0012] In some embodiments, the dust cover is provided with a concave recess at one end close to the guide sleeve, and the outer end of the guide sleeve is inserted into the recess.

[0013] In some embodiments, the outer end of the guide sleeve is provided with an annular protrusion extending radially outwardly, and when the guide sleeve is inserted into the end of the electric trolley shell, the annular protrusion abuts against the end of the electric trolley shell.

[0014] In some embodiments, the outer side wall of the guide sleeve is provided with a plurality of axially extending protrusions in the circumferential direction.

[0015] In some embodiments, the waterproof cover is made of thermoplastic polyurethane elastomer material.

[0016] Compared with the related art, the waterproof and dustproof structure of the electric push rod has the following advantages: the waterproof end cover at the end of the electric push rod shell is divided into a guide sleeve and a dust cover, the inner wall of the guide sleeve is provided with an annular sealing element in sealing connection with the driving rod, and the elastic waterproof cover formed by the glue injection molding on the dust cover is in sealing connection with the outer peripheral wall of the driving rod; therefore, the waterproof and dustproof structure of the electric push rod has two sealing structures, i.e., the annular sealing element on the guide sleeve and the annular sealing body on the waterproof cover, so that the waterproof and dustproof performance is good, and the waterproof and dustproof structure is composed of the guide sleeve and the dust cover, the mold opening difficulty is low when the dust cover is in the waterproof cover and the annular sealing body, the annular sealing body can be effectively prevented from being adhered, the product failure rate is reduced, and the production and manufacturing of the waterproof and dustproof structure are more simple and convenient.

[0017] Another technical solution of the application is to provide an electric push rod with the waterproof and dustproof structure of any one of the above embodiments. Therefore, the waterproof and dustproof structure of the electric push rod not only has good waterproof and dustproof performance, but also can reduce the mold opening difficulty, reduce the product failure rate, and make the production and manufacturing of the electric push rod more simple and convenient. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structural schematic view of a waterproof and dustproof structure of an electric push rod according to some embodiments of the application.

[0019] Figure 2 is an assembled structural schematic view of a waterproof and dustproof structure of an electric push rod according to some embodiments of the application.

[0020] Figure 3 is a sectional structural schematic view of a waterproof and dustproof structure of an electric push rod according to some embodiments of the application.

[0021] Figure 4 is an assembled structural schematic view of a guide sleeve and a dust cover of a waterproof and dustproof structure of an electric push rod according to some embodiments of the application.

[0022] Figure 5 is another angle assembled structural schematic view of a guide sleeve and a dust cover of a waterproof and dustproof structure of an electric push rod according to some embodiments of the application.

[0023] Figure 6 is a sectional structural schematic view of a waterproof and dustproof structure of an electric push rod according to some embodiments of the application.

[0024] BRIEF DESCRIPTION OF DRAWINGS

[0025] 1, housing, 2, drive rod, 3, dust cover, 300, waterproof cover, 301, annular sealing body, 302, encapsulating body, 303, recess, 4, guide sleeve, 400, annular step, 401, annular sealing member, 402, annular protrusion, 403, protruding rib. DETAILED DESCRIPTION

[0026] First, those skilled in the art should understand that these embodiments are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can adjust them as needed in order to adapt to specific application occasions.

[0027] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0028] In the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be in indirect contact through an intermediate medium. Moreover, the first feature can be above, above and above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature can be below, below and below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0029] The present application will be further described in detail below in conjunction with the drawings and specific embodiments.

[0030] Reference Figures 1-6The application discloses a waterproof and dustproof structure of an electric push rod, which is used between the end of an electric push rod shell 1 and a driving rod 2 and comprises an end cover connected to the end of the electric push rod shell 1, which is in sealing cooperation with the driving rod 2 of the electric push rod. Specifically, the waterproof and dustproof structure of the electric push rod comprises a guide sleeve 4 and a dustproof cover 3. The guide sleeve 4 is inserted into the end of the electric push rod shell 1 and is sleeved on the driving rod 2 of the electric push rod, and a central hole of the guide sleeve 4 is used for guiding axial extension and retraction of the driving rod 2 of the electric push rod. An outer side wall of the guide sleeve 4 is provided with a plurality of axially extending convex ribs 403. The convex ribs 403 further improve the mechanical properties of the guide sleeve 4, so that the guide sleeve 4 is not easy to deform and has stable guiding effect. In addition, an inner wall of an outer end of the guide sleeve 4 is provided with an annular sealing element 401 in sealing cooperation with the driving rod 2. The annular sealing element 401 is an annular sealing ring or an O-shaped sealing ring and is used for sealing the inner wall of the central hole of the guide sleeve 4 and the driving rod 2.

[0031] Further in the embodiment, the dustproof cover 3 is arranged on the outer end of the guide sleeve 4 and is fixedly connected to the end of the electric push rod shell 1 through fasteners. A soft and elastic waterproof cover 300 is formed on the dustproof cover 3 by rubber injection molding, and an annular sealing body 301 in sealing cooperation with the outer peripheral wall of the driving rod 2 is formed on the inner wall of the central hole of the waterproof cover 300. That is to say, in the embodiment, the waterproof end cover of the end of the electric push rod shell 1 is split into two independent components, namely the guide sleeve 4 and the dustproof cover 3. The inner wall of the guide sleeve 4 is provided with the annular sealing element 401 in sealing cooperation with the driving rod 2, and the waterproof cover 300 formed on the dustproof cover 3 by rubber injection molding is provided with the annular sealing body 301 in sealing cooperation with the outer peripheral wall of the driving rod 2. Therefore, the waterproof and dustproof structure of the electric push rod has two sealing structures, namely the annular sealing element 401 on the guide sleeve 4 and the annular sealing body 301 on the waterproof cover 300. In this way, the waterproof and dustproof performance is good, and the waterproof and dustproof structure is composed of two independent components, namely the guide sleeve 4 and the dustproof cover 3. When the waterproof cover 300 and the annular sealing body 301 are formed by rubber injection molding, the difficulty of mold opening is low, the annular sealing body 301 can be effectively prevented from being adhered, the product failure rate is reduced, and the production and manufacturing of the waterproof and dustproof structure are more simple and convenient.

[0032] In the embodiment, referring to Figure 1 and Figure 2As shown, the guide sleeve 4 is fully inserted into the end of the electric push rod shell 1, the dust cover 3 is covered on the outer end of the guide sleeve 4 and is fixedly connected with the end of the electric push rod shell 1 through fasteners, and the annular sealing body 301 on the elastic waterproof cover 300 which is overmolded on the dust cover 3 is sealingly matched with the outer peripheral wall of the drive rod 2. The overmolding is also called overmolding, or secondary injection molding, or two-color injection molding, etc., that is, the waterproof cover 300 is overmolded on the dust cover 3, and the waterproof cover 300 is arranged on the surface of the dust cover 3 and is formed in an integral structure with the dust cover 3.

[0033] In the above embodiment, the dust cover 3 can be made of a thermoplastic crystalline polymer material, such as POM (polyoxymethylene), which is an engineering plastic and has good mechanical properties, and has hardness, strength and steeliness similar to metal. The waterproof cover 300 overmolded on the dust cover 3 is made of a thermoplastic polyurethane elastomer material, such as TPU or TPE soft rubber material, which has good elasticity and softness, so that the annular sealing body 301 on the waterproof cover 300 has higher elasticity, sealing performance and wear resistance.

[0034] It can be understood that the waterproof end cover of the end of the electric push rod shell 1 is divided into two independent parts, the guide sleeve 4 and the dust cover 3. When overmolding the waterproof cover 300 on the dust cover 3, the dust cover 3 is only needed to be placed and positioned in the cavity of the mold to injection mold the waterproof cover 300, so that the difficulty of mold opening is greatly reduced. Moreover, only one annular sealing body 301 for sealing cooperation with the drive rod 2 of the electric push rod is formed on the waterproof cover 300, compared with the related art which needs to form two annular sealing bodies 301 on the waterproof cover 300, the sticking of the annular sealing body 301 during injection molding can be avoided, so that the product failure rate can be reduced.

[0035] Further in the embodiment, referring to Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, the inner wall of the guide sleeve 4 is provided with an annular step 400 which is in communication with the outer end surface of the guide sleeve 4, and the annular sealing member 401 is arranged on the annular step 400, and when the dust cover 3 is arranged on the outer end of the guide sleeve 4, the annular sealing member 401 is axially limited on the annular step 400. That is, in this embodiment, the guide sleeve 4 and the dust cover 3 are in an assembled relationship, and when the dust cover 3 is arranged on the outer end of the guide sleeve 4, the dust cover 3 just axially limits the annular sealing member 401 on the annular step 400 on the inner wall of the guide sleeve 4, so that other positioning components such as a circlip, a gasket, etc. are not needed to fix the annular sealing member 401, so that the waterproof and dustproof structure of the electric push rod is more simple in structure. In addition, when installing or replacing the annular sealing member 401, the dust cover 3 only needs to be removed, and the annular sealing member 401 can be easily removed or installed from the annular step 400, so that the installation or replacement of the annular sealing member 401 is more simple and convenient.

[0036] In order to further improve the waterproof and dustproof performance of the waterproof and dustproof structure of the electric push rod, as shown in Figure 3 、 Figure 5 and Figure 6 , the waterproof cover 300 also has a rubber body 302 arranged on one end of the dust cover 3 close to the electric push rod housing 1, and the rubber body 302 is sealingly attached to the outer end surface of the electric push rod housing 1. That is, in this embodiment, the rubber body 302 is part of the waterproof cover 300, and when the waterproof cover 300 is rubber injection molded, a part of the rubber injection is molded on one end of the dust cover 3 close to the electric push rod housing 1 to form the rubber body 302. The rubber body 302 is soft and elastic, and when it is attached to the end surface of the electric push rod housing 1, it functions as a sealing member, so that a sealing member does not need to be additionally arranged between the dust cover 3 and the end surface of the electric push rod housing 1, thereby making the installation of the dust cover 3 more simple and convenient, and further improving the waterproof and dustproof performance of the end portion of the housing 1.

[0037] In this embodiment, as shown in Figure 2 、 Figure 3 、 Figure 4 and Figure 6 , the annular sealing body 301 is arranged to extend outwardly in the axial direction, and at least a part of the annular sealing body 301 protrudes from the outer end surface of the waterproof cover 300. In this way, when there is dust or water droplets on the drive rod 2, the annular sealing body 301 can scrape the dust or water droplets on it away from the drive rod 2 in time or in advance, thereby preventing dust or water droplets from entering the electric push rod.

[0038] In order to make the structure of the cooperation between the dust cover 3 and the guide sleeve 4 more compact and the structural stability better, in some embodiments, as shown in Figure 5The dustproof cover 3 is provided with a concave recess 303 near one end of the guide sleeve 4, and the guide sleeve 4 is inserted into the recess 303. In this way, when the dustproof cover 3 is arranged on the outer end of the guide sleeve 4, the dustproof cover 3 is combined more tightly with the guide sleeve 4, and the annular sealing element 401 on the annular step 400 of the guide sleeve 4 is axially limited more stably, so that the annular sealing element 401 is prevented from being bent and deformed in the axial direction during the movement of the drive rod 2, and the waterproof and dustproof performance is further improved.

[0039] In some embodiments, in order to assemble the guide sleeve 4 and to press the dustproof cover 3 more tightly with the guide sleeve 4 when the dustproof cover 3 is arranged on the guide sleeve 4, as shown in Figs. Figure 3 、 Figure 5 and Figure 6 the outer end of the guide sleeve 4 is provided with an annular protrusion 402 extending radially outward, and the annular protrusion 402 abuts against the end of the electric push rod shell 1 when the guide sleeve 4 is inserted into the end of the electric push rod shell 1. In this way, when the dustproof cover 3 is fixed to the end of the electric push rod shell 1 by the fastener, the dustproof cover 3 and the outer end of the guide sleeve 4 are pressed more tightly, and the structure is stable.

[0040] Another embodiment of the present application discloses an electric push rod having the waterproof and dustproof structure of any one of the above embodiments. Therefore, the electric push rod has good waterproof and dustproof performance, and the guide sleeve 4 and the dustproof cover 3 of the waterproof and dustproof structure are independently arranged, the difficulty of mold opening is reduced, the product failure rate is reduced, and the production and manufacturing of the electric push rod are more simple and convenient.

[0041] In the description of the embodiments of the present application, it should be noted that in the description of the present application, the terms indicating the direction or positional relationship are based on the direction or positional relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0042] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "in this embodiment", "specific examples", or "some examples" means that the specific features, mechanisms, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. Furthermore, the skilled person in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0043] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any changes or replacements within the technical scope disclosed by the present application can be easily conceived by the person skilled in the art, and should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An electric trolley waterproof and dustproof structure, characterized in that: Comprising A guide sleeve is inserted into the end of the electric push rod shell and covers the drive rod of the electric push rod, and an annular sealing element is arranged on the inner wall of the outer end of the guide sleeve to seal the drive rod; A dust cover is arranged on the outer end of the guide sleeve and fixedly connected with the end of the electric push rod shell, and a soft and elastic waterproof cover is formed on the dust cover by rubber injection molding, and an annular sealing body is formed on the inner wall of the central hole of the waterproof cover to seal and cooperate with the outer peripheral wall of the drive rod.

2. The waterproof and dustproof structure for an electric trolley according to claim 1, characterized in that: An annular step is arranged on the inner wall of the guide sleeve and penetrates the end face of the outer end of the guide sleeve, the annular sealing element is arranged on the annular step, and when the dust cover is arranged on the outer end of the guide sleeve, the annular sealing element is axially limited on the annular step.

3. The waterproof and dustproof structure for an electric trolley according to claim 2, characterized in that: The waterproof cover has a rubber body arranged on one end of the dust cover close to the electric push rod shell, and the rubber body is sealingly attached to the outer end face of the electric push rod shell.

4. The waterproof and dustproof structure for an electric trolley according to claim 1, characterized in that: The annular sealing body is arranged in an outwardly inclined manner along the axial direction, and at least a part of the annular sealing body protrudes from the outer end face of the waterproof cover.

5. The waterproof and dustproof structure for an electric trolley according to claim 1, characterized in that: The dust cover is provided with a concave recess on one end close to the guide sleeve, and the outer end of the guide sleeve is inserted into the recess.

6. The waterproof and dustproof structure for an electric trolley according to claim 1, characterized in that: The outer end of the guide sleeve is provided with an annular protrusion extending radially outward, and when the guide sleeve is inserted into the end of the electric push rod shell, the annular protrusion abuts against the end of the electric push rod shell.

7. The waterproof and dustproof structure for an electric trolley according to claim 6, characterized in that: The outer side wall of the guide sleeve is provided with a plurality of axially extending protrusions in the circumferential direction.

8. The waterproof and dustproof structure for an electric trolley according to claim 1, characterized by: The waterproof cover is made of thermoplastic polyurethane elastomer material.

9. An electric push rod characterized by: An electric push rod waterproof and dustproof structure having any one of the above claims 1-8. An electric push rod waterproof and dustproof structure having any one of the above claims 1-8.

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