WO2021139036A1 - Electrically powered strut for automobile tailgate - Google Patents

Abstract

Provided is an electrically powered strut for an automobile tailgate, comprising a screw rod (1), a screw sleeve (2), a screw nut (3), a spring (4), an inner sleeve (5), an outer sleeve (6), a spring support tube (11), an electric motor assembly ( 9), an upper ball-and-socket assembly (7), and a lower ball-and-socket assembly (8); the upper end surface of the spring support tube (11) has an upper position-limiting part (111), and the outer sleeve (6) is provided with a first position-limiting part (61) which fits with the upper position-limiting part (111); by means of the fitting of the upper position-limiting part (111) and the first position-limiting part (61), the circumferential rotation of the spring support tube (11) and the electric motor assembly (9) is stopped; the inner wall surface of the spring support tube (11) is provided with a plurality of axially-arranged position-limiting grooves (112); the upper part of the screw sleeve (2) is provided with a convex strip (51) fitting with the position-limiting groove (112); by means of the fitting of the convex strip (51) and the position-limiting groove (112), the circumferential rotation of the spring support tube (11) and the screw sleeve (2) can be stopped; each of the inner and outer sleeves is provided with a water outlet hole.

Description

Electric strut for automobile tailgate Technical field

The utility model relates to the technical field of automobile spare parts, in particular to an electric support rod for an automobile tailgate.

Background technique

At present, more and more automobiles use electric tailgates to automatically open and close doors, and customers' requirements for appearance and practicality are also increasing.

Electric struts are generally installed on the body through the cooperation of the ball head and the ball and socket assembly, and the other end is installed on the tailgate. The shell of the motor assembly is fixed to the outer tube, and the output end of the motor assembly drives the screw rod to rotate, and finally realizes electric The expansion and contraction of the strut, the gap between the ball head and the ball and socket assembly when the motor assembly is started, and the gap between the ball head and the ball and socket assembly, etc., the motor assembly will produce a reaction force. First, the inner sleeve fixed with the screw nut may produce follow-up rotation, which affects the electric drive. The stability of the strut; the second is that it is easy to damage the internal parts of the electric strut after a long time, and the vibration is large when starting, and it is not stable, which affects the user experience.

In addition, when the door is closed, the outer casing section of the electric strut is located above and the inner sleeve section is below. The electric strut generally does not enter water, but when the tailgate is closed, it will be exposed to long periods of rain and rain. In weather or when washing the car, it will inevitably enter the inside of the electric strut. Another situation is that when the tailgate is opened and the car is washed, the inner casing section is located above and the outer casing section is located below. At this time, water is easier to pass through. The gap at the junction of the inner and outer sleeves enters into the outer sleeve, and if it is not discharged for a long time, it is easy to damage the drive components such as the motor assembly, and then affect the performance of the electric strut.

Utility model content

In order to make up for the above shortcomings, the technical problem to be solved by the present utility model is to provide an automobile tailgate electric strut, which can effectively improve the anti-rotation effect of the motor assembly, and facilitate the smooth drainage of the water entering the strut, ensuring Performance stability of electric struts.

In order to solve the above technical problems, a technical solution adopted by the present utility model is to provide an electric brace for an automobile tailgate, which includes a screw rod, a screw sleeve, a screw nut, a spring, an inner sleeve, an outer sleeve, and an upper ball The socket assembly, the lower ball socket assembly, the motor assembly and the spring support tube define the end where the motor assembly is located as the upper end. The output end of the motor assembly drives the upper end of the screw rod, and the lower end of the screw rod is connected to the screw rod. Nut connection, the screw nut is fixedly installed on the upper end of the screw sleeve, the lower end of the screw sleeve and the lower end of the inner sleeve are both fixedly connected to the lower ball and socket assembly, the spring The support tube is sleeved on the outer circumference of the screw sleeve, the spring is sleeved on the outer circumference of the spring support tube, the inner sleeve is sleeved on the outer circumference of the spring, and the outer sleeve is sleeved on the inner sleeve The outer circumference of the outer sleeve and the outer sleeve can move axially along the inner sleeve, and the upper end of the outer sleeve is fixedly connected to the upper ball and socket assembly;

The upper end surface of the spring support tube has an upper limit portion, the outer sleeve is provided with a first limit portion matching the upper limit portion, and the upper limit portion and the first limit portion cooperate with each other A first anti-rotation structure is formed, and the circumferential rotation of the spring support tube and the motor assembly can be realized through the cooperation of the upper limit portion and the first limit portion;

The inner wall surface of the spring support tube is provided with a plurality of axially-arranged limiting grooves, the upper part of the inner sleeve is provided with a convex strip matching the direction of the limiting groove, and the limiting groove and the convex The bar cooperates to form a second anti-rotation structure, and the circumferential rotation of the spring support tube and the inner sleeve can be realized by the cooperation of the convex bar and the limiting groove;

The upper end of the screw rod has a ring of grooves, a sealing ring is installed in the grooves, and a seal is formed between the sealing ring and the motor assembly;

A sealing gasket is provided between the housing of the output end of the motor assembly and the step of the outer sleeve, and a seal is formed between the housing of the output end of the motor assembly and the outer sleeve through the sealing gasket;

The lower part of the inner sleeve is provided with four first water outlet holes, the first water outlet holes are through holes that penetrate the wall of the inner sleeve; the outer sleeve is located below the motor assembly with Four second water outlet holes, the second water outlet holes being through holes penetrating the pipe wall of the outer sleeve.

In order to solve the above-mentioned technical problems, a further technical solution adopted by the present invention is to define the connection between the upper and lower ball and socket components and the ball head as the ball head connection part, and the ball head connection part is the and The ball head is matched with a recess, and the recess is provided with a plurality of oil storage grooves for storing grease.

Furthermore, the upper limit part and the first limit part are both limit parts composed of a circle of concave parts and convex parts arranged at intervals.

Furthermore, the lower end of the inner sleeve is pressure riveted connected to the lower ball and socket assembly.

Furthermore, each of the ball joints is provided with four oil storage grooves, and the four oil storage grooves are evenly spaced at the ball joints.

Furthermore, the upper end of the outer sleeve is laser welded to the ball and socket assembly.

Furthermore, the apertures of the first water outlet hole and the second water outlet hole are both 2.5-3.5 mm.

Furthermore, the upper ball socket assembly is connected to the vehicle body through a ball head.

Furthermore, the lower ball and socket assembly is connected to the tailgate through a ball head.

The beneficial effects of the utility model:

The utility model includes a screw rod, a screw sleeve, a screw nut, a spring, an inner sleeve, an outer sleeve, an upper ball socket assembly, a lower ball socket assembly, a spring support tube and a motor assembly. The upper end surface of the spring support tube has an upper limit The position part, through the cooperation of the upper limit part and the first limit part of the outer sleeve, the circumferential rotation of the spring support tube and the motor assembly can be realized; the inner wall surface of the spring support tube is provided with a plurality of axially arranged limit grooves, The upper part of the inner sleeve is provided with a protruding strip that matches the direction of the limiting groove, and the circumferential rotation of the spring support tube and the inner sleeve can be realized through the cooperation of the protruding strip and the limiting groove. Therefore, in the present invention, one It can prevent the motor assembly from rotating relative to the electric strut, and increase the stability of the strut system; second, the electric strut will not produce large vibration and displacement when the motor assembly drives the screw to rotate. Increase the smoothness of the up and down movement of the strut; in addition, the lower part of the inner sleeve is provided with four first water outlet holes, and the outer sleeve is located below the motor assembly and has four second water outlet holes, so that the electric strut of the present invention has Better drainage effect, whether it is rainy or rainy or the water generated during the car washing process can be discharged in time, avoiding the long-term high humidity inside the strut and affecting the normal function of each component, and prolonging the service life of the strut; through sealing The use of the ring and the sealing gasket ensures that the residual moisture in the outer tube will not enter the motor assembly;

Furthermore, the ball joints of the upper and lower ball and socket assemblies of the present invention are sockets that match the ball heads, and the sockets are provided with a plurality of oil storage grooves for storing grease, so that the struts of the present invention can pass through When the ball head is connected to the body and the tailgate, the grease stored in the oil storage tank can lubricate the ball head and improve the smoothness of the tailgate opening and closing;

Furthermore, the lower end of the inner sleeve of the present invention is connected to the lower ball and socket assembly by pressure riveting, the traditional inner sleeve and the lower ball and socket assembly are connected by threading, and the method of the present invention is pressure riveting to connect the two. Even if it is used for a long time or when the car is relatively vibrated, the connection between the inner sleeve and the lower ball and socket assembly will not loosen and fall off, improving safety;

Furthermore, the apertures of the first water outlet hole and the second water outlet hole of the present invention can both be 2.5-3.5mm, and the design of the aperture size is reasonable. If it is too large, dust and impurities will easily enter the inside of the electric strut. After a long time, Affect the performance of the electric strut. If it is too small, the drainage effect will be poor, and it will also affect the performance of the electric strut if it takes a long time.

Description of the drawings

Figure 1 is an external view of the utility model;

Figure 2 is a schematic diagram of the exploded structure of the utility model;

Figure 3 is a partial enlarged view of part A of Figure 2;

Fig. 4 is a partial enlarged view of part B of Fig. 2;

Figure 5 is a cross-sectional view of the first anti-rotation structure of the present invention;

Figure 6 is a radial cross-sectional view of the inner sleeve of the utility model;

Figure 7 is a schematic diagram of the structure of the upper ball and socket assembly of the present invention;

Figure 8 is an axial sectional view of the utility model;

Fig. 9 is a partial enlarged view of part C of Fig. 8;

The reference signs of each part in the figure are as follows:

Screw 1, screw sleeve 2, screw nut 3, spring 4, inner sleeve 5, convex strip 51, first water outlet 52, outer tube 6, first limiting portion 61, second water outlet 62, The upper ball and socket assembly 7, the ball joint 71, the oil storage groove 711, the lower ball and socket assembly 8, the motor assembly 9, the sealing ring 10, the spring support tube 11, the upper limit portion 111, the limit groove 112, and the sealing gasket 12.

Detailed ways

The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model. Without departing from the spirit and essence of the utility model, any modification or replacement of the method, steps or conditions of the utility model shall fall within the protection scope of the utility model.

Example: An electric strut for an automobile tailgate, as shown in Figures 1 to 9, the electric strut includes a screw rod 1, a screw sleeve 2, a screw nut 3, a spring 4, an inner sleeve 5. The outer sleeve 6, the upper ball and socket assembly 7, the lower ball and socket assembly 8, the motor assembly 9 and the spring support tube 11 define the end where the motor assembly is located as the upper end, and the output end of the motor assembly drives the upper end of the screw rod, so The lower end of the screw rod is connected with the screw nut, the screw nut is fixedly installed at the upper end of the screw sleeve, and the lower end of the screw sleeve and the lower end of the inner sleeve are both fixedly connected to In the lower ball and socket assembly, the spring support tube is sleeved on the outer periphery of the screw sleeve, the spring is sleeved on the outer periphery of the spring support tube, the inner sleeve is sleeved on the outer periphery of the spring, so The outer sleeve is sleeved on the outer circumference of the inner sleeve, the outer sleeve can move axially along the inner sleeve, and the upper end of the outer sleeve is fixedly connected to the upper ball and socket assembly;

The upper end surface of the spring support tube has an upper limit portion 111, and the outer sleeve is provided with a first limit portion 61 matching the upper limit portion, and passes through the upper limit portion and the first limit portion. The first anti-rotation structure is formed by the cooperation of, and the circumferential rotation of the spring support tube and the motor assembly can be realized by the cooperation of the upper limit portion and the first limit portion;

The inner wall surface of the spring support tube is provided with a plurality of axially-arranged limiting grooves 112, and the upper part of the inner sleeve is provided with a convex strip 51 matching the direction of the limiting groove. The convex bar cooperates to form a second anti-rotation structure, and the circumferential rotation of the spring support tube and the inner sleeve can be realized by the cooperation of the convex bar and the limiting groove; in this embodiment, the There are 3 sets of protruding strips, and 3 sets of limit grooves are also provided, but it is not limited to this.

The upper end of the screw rod has a ring of grooves, a sealing ring 10 is installed in the grooves, and a seal is formed between the sealing ring and the motor assembly;

A sealing gasket 12 is provided between the housing of the output end of the motor assembly and the step of the outer sleeve, and a seal is formed between the housing of the output end of the motor assembly and the outer sleeve through the sealing gasket;

Through the use of the seal ring and the gasket, an axial and axial seal is formed between the housing of the motor assembly and the upper end of the screw rod and the outer sleeve. Even if there is residual moisture in the outer sleeve, it will not enter the interior of the motor assembly , To ensure the use environment and service life of the motor components;

The lower part of the inner sleeve is provided with four first outlet holes 52, the first outlet holes are through holes penetrating the wall of the inner sleeve; the outer sleeve is located below the motor assembly There are four second water outlet holes 62, and the second water outlet holes are through holes penetrating the pipe wall of the outer sleeve. In this embodiment, the four first water outlet holes are evenly spaced along the circumferential direction of the inner sleeve; the four second water outlet holes are evenly spaced along the axial direction of the outer sleeve.

In this embodiment, the connection between the upper ball and socket assembly and the lower ball and socket assembly and the ball head is defined as a ball head connecting portion 71, and the ball head connecting portion is a dimple that matches the ball head. The recess is provided with a plurality of oil storage tanks 711 for storing grease.

In this embodiment, the upper limit part and the first limit part are both limit parts composed of a circle of concave parts and convex parts arranged at intervals.

In this embodiment, the lower end of the inner sleeve is pressure riveted connected to the lower ball and socket assembly. The traditional inner sleeve and the lower ball and socket assembly adopt threaded connection, and the method of the present utility model connects the two by pressing riveting. Even if it is used for a long time or when the car is relatively vibrated, the inner sleeve and the lower ball and socket assembly The connection of the components will not loosen and fall off, improving safety

In this embodiment, each of the ball joints is provided with four oil storage grooves, and the four oil storage grooves are evenly spaced at the ball joints.

In this embodiment, the upper end of the outer sleeve is laser welded to the ball and socket assembly.

In this embodiment, the apertures of the first water outlet hole and the second water outlet hole are both 2.5-3.5 mm. The design of the aperture size is reasonable. If it is too large, dust and impurities will easily enter the inside of the electric strut. After a long time, it will affect the performance of the electric strut. If it is too small, the drainage effect will be poor, and if it takes a long time, it will also affect the electric strut. Performance. In this embodiment, the apertures of the first water outlet hole and the water outlet hole are both 3 mm. Of course, the following structure can also be adopted at the first outlet hole and the second outlet hole. The inner wall of the inner sleeve corresponds to the position of the first outlet hole and the inner wall of the outer sleeve and corresponds to the second outlet. The location of the water outlet is equipped with a dust-proof filter (not shown in the figure). The dust-proof filter is a filter through which water can pass but relatively large impurities and particles cannot pass through, such as a 120-mesh metal filter, but it is not limited to this, as long as it can perform the above functions.

The upper ball socket assembly is connected to the vehicle body through a ball head.

The lower ball socket assembly is connected to the tail gate through a ball head.

The working principle and working process of the utility model are:

The working principle of the car tailgate electric strut is based on the prior art, so we will not repeat it. For example, you can refer to the Chinese utility model patent "Balance strut for car tailgate", the patent number is ZL 201821340318.4; in this embodiment, the spring and screw sleeve A spring support tube is added between the tubes. The upper end of the spring support tube and the outer sleeve are circumferentially stopped by the first anti-rotation structure, and the inner wall surface of the spring support tube and the screw sleeve are circumferentially stopped by the second anti-rotation structure. The motor The output end of the assembly drives the screw rod to rotate through the coupling, and is converted into the relative linear motion between the inner sleeve and the inner sleeve through the screw nut, so as to realize the extension and contraction of the electric strut. Function, the driving force of the motor assembly only drives the screw to rotate, even when the motor assembly is started, the motor body is caused by the reaction force generated by the rotation of the motor shaft of the motor assembly and the rotation of the motor body (the motor body is fixedly connected to the outer tube). The generated vibration will be offset by the circumferential rotation stop of the upper end of the spring support tube and the outer sleeve, and the circumferential rotation stop of the lower end and the screw sleeve;

That is: even when the motor assembly is started, the first anti-rotation structure will not cause the electric strut and the motor assembly as a whole to vibrate or rotate. The circumferential limit between the inner wall surface of the spring support tube and the screw sleeve is It can ensure that the screw bushing only moves axially, and does not produce circumferential rotation, that is, during the entire working process of the electric strut, the electric strut will not produce large vibration and displacement, increasing the up and down of the strut. Smoothness of the activity site;

The lower part of the inner sleeve is provided with four first water outlet holes, and the outer sleeve is located below the motor assembly with four second water outlet holes. When the tailgate is closed, the outer sleeve section is located above and the inner sleeve section is located below. In rainy weather or when washing the car, the internal water that enters the electric brace will be discharged through the first water outlet of the inner casing. When the tailgate is opened, the inner casing section is located above and the outer casing section is located below. When washing the car, it enters the electric brace. The internal moisture of the rod will be discharged through the second water outlet hole of the outer sleeve.

Obviously, the above-mentioned embodiments are merely examples for clear description, and are not intended to limit the implementation manners. For those skilled in the art, other changes or modifications in different forms can be made on the basis of the above description. No need to be exhaustive here. The obvious changes or changes derived from this are still within the scope of protection created by the present utility model.

Claims (9)

An electric strut for an automobile tailgate, which is characterized in that the electric strut includes a screw rod (1), a screw sleeve (2), a screw nut (3), a spring (4), and an inner sleeve (5). ), outer sleeve (6), upper ball and socket assembly (7), lower ball and socket assembly (8), motor assembly (9) and spring support tube (11), defining the end where the motor assembly is located as the upper, the motor assembly The output end of the screw rod drives the upper end of the screw rod, the lower end of the screw rod is connected with the screw nut, and the screw nut is fixedly installed at the upper end of the screw rod sleeve, and the lower end of the screw rod sleeve The lower end of the inner sleeve is fixedly connected to the lower ball and socket assembly, the spring support tube is sleeved on the outer periphery of the screw sleeve, the spring is sleeved on the outer periphery of the spring support tube, the The inner sleeve is sleeved on the outer circumference of the spring, the outer sleeve is sleeved on the outer circumference of the inner sleeve and the outer sleeve can move axially along the inner sleeve, and the upper end of the outer sleeve is fixedly connected to the outer sleeve. The above ball and socket assembly; The upper end surface of the spring support tube has an upper limit portion (111), and the outer sleeve is provided with a first limit portion (61) that matches the upper limit portion, and passes through the upper limit portion and the first limit portion (61). The cooperation of a limit part forms a first anti-rotation structure, and the circumferential rotation of the spring support tube and the motor assembly can be realized by the cooperation of the upper limit part and the first limit part; The inner wall surface of the spring support tube is provided with a plurality of limiting grooves (112) arranged axially, and the upper part of the inner sleeve is provided with a convex strip (51) matching the direction of the limiting grooves. The position groove cooperates with the convex strip to form a second anti-rotation structure, and the circumferential rotation of the spring support tube and the inner sleeve can be realized by the cooperation of the convex strip and the limit groove; The upper end of the screw rod has a ring of grooves, a sealing ring (10) is installed in the grooves, and a seal is formed between the sealing ring and the motor assembly; A sealing gasket (12) is provided between the housing of the output end of the motor assembly and the step of the outer sleeve, and a seal is formed between the housing of the output end of the motor assembly and the outer sleeve through the sealing gasket; The lower part of the inner sleeve is provided with four first water outlet holes (52), and the first water outlet holes are through holes penetrating the pipe wall of the inner sleeve; the outer sleeve is located in the motor assembly There are four second water outlet holes (62) below, and the second water outlet holes are through holes penetrating the pipe wall of the outer sleeve. The automobile tailgate electric strut according to claim 1, characterized in that: the connection between the upper ball socket assembly and the lower ball socket assembly and the ball head is defined as a ball head connecting portion (71), and the ball The head connection part is a recess that matches the ball head, and the recess is provided with a plurality of oil storage grooves (711) for storing grease. The electric car tailgate brace according to claim 1, wherein the upper limit part and the first limit part are both limit parts composed of a circle of concave parts and convex parts arranged at intervals. The electric strut for the tailgate of an automobile according to claim 1, wherein the lower end of the inner sleeve is connected to the lower ball and socket assembly by pressure riveting. The automobile tailgate electric strut according to claim 2, characterized in that: each of the ball joints is provided with four oil storage tanks, and the four oil storage tanks are evenly spaced at the ball head. Connecting part. The electric strut for the tailgate of an automobile according to claim 1, wherein the upper end of the outer sleeve is laser welded to the ball-and-socket assembly. The electric strut for the tailgate of an automobile according to claim 1, wherein the apertures of the first water outlet hole and the second water outlet hole are both 2.5-3.5 mm. The electric strut for the tailgate of an automobile according to claim 1, wherein the upper ball and socket assembly is connected to the vehicle body through a ball head. The electric strut for the tailgate of an automobile according to claim 1, wherein the lower ball socket assembly is connected to the tailgate through a ball head.

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