Limiting device, tailgate device and vehicle

Abstract

The present application provides a limiting device, a tailgate device, and a vehicle to solve the problem of inconvenience caused to users by the door limiting device in the related art. The limiting device includes a cylinder and a piston assembly. The cylinder is provided with a housing chamber. The piston assembly is arranged in the housing chamber. The cylinder and the piston assembly are slidably connected. The cylinder includes a first segment and a second segment alternately arranged along the length direction of the cylinder. The inner diameter of the first segment is larger than the inner diameter of the second segment. The piston assembly includes a piston rod and a limiting assembly. The limiting assembly divides the housing chamber into a first cavity and a second cavity. The limiting assembly includes a ventilation valve, a first seal, a second seal, a spring, and a support. The spring is in an elastically compressed state. The ventilation valve is provided with a first channel, a second channel, and a slide groove. The first seal can be slidably arranged in the slide groove, and the first seal at least partially extends out of the slide groove. The second seal is opposite to the first end of the first channel. The present application can improve the convenience of user use.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a limiting device, a tailgate device and a vehicle. Background Art

[0002] Car doors are usually equipped with limit devices to allow the doors to stay stably at a certain opening angle. On the one hand, this meets the needs of passengers getting on and off the car or picking up items, and on the other hand, it ensures that the doors do not collide with surrounding obstacles. The limit device usually provides a second or third gear limit function. However, due to the large opening of the side-opening tailgate, the heavy weight of the spare tire, and the large difference in cross-sectional form from the side door, the above-mentioned limit device is usually not suitable. The commonly used limit device at present is the gas spring. The gas spring product has a simple structure and high reliability. However, when using the gas spring, the tailgate will automatically open to the maximum angle after opening to the balance point, which is easy to collide with pedestrians or obstacles. The functional defects are more obvious, causing inconvenience to users. Summary of the Invention

[0003] The embodiments of the present application provide a limiting device, a tailgate device, and a vehicle to solve the problem in the related art that the limiting device of a car door causes inconvenience to the user.

[0004] To solve the above technical problems, this application is implemented as follows:

[0005] In a first aspect, an embodiment of the present application provides a limiting device, comprising a cylinder and a piston assembly, wherein an accommodating chamber is provided in the cylinder, the piston assembly is disposed in the accommodating chamber, and the cylinder and the piston assembly are slidably connected;

[0006] The cylinder comprises a first segment and a second segment alternately arranged along the length direction of the cylinder, wherein the inner diameter of the first segment is larger than the inner diameter of the second segment;

[0007] The piston assembly includes a piston rod and a limiting assembly, the limiting assembly divides the accommodating chamber into a first cavity and a second cavity, the limiting assembly includes a ventilation valve, a first sealing member, a second sealing member, a spring and a support member, the ventilation valve, the second sealing member, the spring and the support member are respectively sleeved on the piston rod, and the ventilation valve, the second sealing member, the spring and the support member are sequentially arranged along the axial direction of the piston rod; the ventilation valve and the support member are respectively fixedly connected to the piston rod; the first end of the spring is fixedly connected to the second sealing member, the second end of the spring is fixedly connected to the support member, and the spring is in an elastically compressed state;

[0008] The ventilation valve includes a ventilation valve body, an outer side wall of the ventilation valve body is provided with an annular protrusion, the ventilation valve is provided with a first channel, a second channel and a slide groove, the first channel, the second channel and the slide groove are respectively arranged along the axis direction of the piston rod, the first channel passes through the ventilation valve body, the second channel is located at the annular protrusion, the slide groove is located at the outer side wall of the ventilation valve body, and the second channel is connected to the slide groove, the first sealing member is slidably provided in the slide groove, and the first sealing member at least partially extends out of the slide groove; the second sealing member is opposite to the first end of the first channel;

[0009] During the process of the piston rod extending relative to the cylinder, when the first sealing member is located in the first segment, the first cavity is connected to the second cavity through the second channel, and the spring pushes the second sealing member to seal the first end of the first channel;

[0010] During the process of the piston rod extending relative to the cylinder, when the first seal is located in the second section, the first seal separates the first cavity from the second cavity, and the second seal moves toward the side of the support member under the action of the gas pressure in the first cavity, so that the first cavity is connected to the second cavity through the first channel.

[0011] In a second aspect, an embodiment of the present application provides a tailgate device, comprising a tailgate body and a limiting device as described in the first aspect, wherein the first end of the limiting device is fixedly connected to the tailgate body, and the second end of the limiting device is used to be fixedly connected to the vehicle body.

[0012] In a third aspect, an embodiment of the present application provides a vehicle comprising the tailgate device as described in the second aspect.

[0013] In an embodiment of the present application, the above-mentioned limiting device includes a cylinder and a piston assembly, the cylinder is provided with a accommodating chamber, the piston assembly is arranged in the accommodating chamber, the cylinder is slidably connected to the piston assembly, the cylinder includes a first segment and a second segment alternately arranged along the length direction of the cylinder, the inner diameter of the first segment is larger than the inner diameter of the second segment, the piston assembly includes a piston rod and a limiting assembly, the limiting assembly divides the accommodating chamber into a first cavity and a second cavity, the limiting assembly includes a ventilation valve, a first sealing member, a second sealing member, a spring and a support member, the ventilation valve, the second sealing member, the spring and the support member are respectively sleeved on the piston rod, and the ventilation valve, the second sealing member, the spring and the support member are arranged in sequence along the axial direction of the piston rod; the ventilation valve and the support member are respectively fixedly connected to the piston rod; the first end of the spring is fixedly connected to the second sealing member, the second end of the spring is fixedly connected to the support member, and the spring is in an elastically compressed state, the ventilation valve includes a ventilation valve itself The cam is connected to the air exchange valve body by a first end and a second end, and the cam is connected to the air exchange valve body by a second end. The cam is connected to the air exchange valve body by a first end and a second end. The cam is connected to the air exchange valve body by a first end and a second end. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0015] Figure 1 This is one of the schematic cross-sectional views of a position limiting device provided in an embodiment of the present application;

[0016] Figure 2This is a second schematic diagram of a cross-sectional structure of a limiting device provided in an embodiment of the present application;

[0017] Figure 3 This is a schematic cross-sectional view of a cylinder provided in an embodiment of the present application;

[0018] Figure 4 This is the third schematic diagram of the cross-sectional structure of a limiting device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0020] In the embodiments of the present application, a limiting device, a tailgate device and a vehicle are proposed to solve the problem that the limiting device of the automobile door in the related art causes inconvenience to the user.

[0021] See also Figure 1 and Figure 2 , Figure 1 and Figure 2 : is a schematic diagram of the cross-sectional structure of a limiting device provided in an embodiment of the present application, such as Figure 1 and Figure 2 As shown, the limiting device includes a cylinder and a piston assembly, the cylinder is provided with an accommodating cavity, the piston assembly is arranged in the accommodating cavity, and the cylinder is slidably connected to the piston assembly;

[0022] The cylinder includes a first segment 1100 and a second segment 1200 alternately arranged along the length direction of the cylinder, and the inner diameter of the first segment 1100 is larger than the inner diameter of the second segment;

[0023] The piston assembly includes a piston rod 2100 and a limiting assembly, the limiting assembly divides the accommodating chamber into a first cavity 1110 and a second cavity 1120, the limiting assembly includes a ventilation valve 2210, a first sealing member 2220, a second sealing member 2230, a spring 2240 and a support member 2250, the ventilation valve 2210, the second sealing member 2230, the spring 2240 and the support member 2250 are respectively sleeved on the piston rod 2100, and ... first sealing member 2220, the second sealing member 2230, the spring 2240 and the support member 2250 are respectively sleeved on the piston rod 2100, and the ventilation valve 2210, the first sealing member 2220, the second sealing member 2230, the spring 2240 and the support member 2250 are respectively sleeved on the piston rod 2100, and the ventilation valve 2210, the first sealing member 2220, the second sealing member 2230, the spring 2240 and the support member 22 The valve 2210, the second sealing member 2230, the spring 2240, and the support member 2250 are sequentially arranged along the axis of the piston rod 2100; the ventilation valve 2210 and the support member 2250 are respectively fixedly connected to the piston rod 2100; the first end of the spring 2240 is fixedly connected to the second sealing member 2230, and the second end of the spring 2240 is fixedly connected to the support member 2250, and the spring 2240 is in an elastically compressed state;

[0024] The ventilation valve 2210 includes a ventilation valve body, an outer wall of the ventilation valve body is provided with an annular protrusion, the ventilation valve 2210 is provided with a first channel 2211, a second channel 2212 and a slide groove 2213, the first channel 2211, the second channel 2212 and the slide groove 2213 are respectively arranged along the axis direction of the piston rod 2100, the first channel 2211 passes through the ventilation valve body, the second channel 2212 is located at the annular protrusion, the slide groove 2213 is located at the outer wall of the ventilation valve body, and the second channel 2212 is connected to the slide groove 2213, the first sealing member 2220 is slidably provided in the slide groove 2213, and the first sealing member 2220 at least partially extends out of the slide groove 2213; the second sealing member 2230 is opposite to the first end of the first channel 2211;

[0025] When the piston rod 2100 is extended relative to the cylinder, when the first sealing member 2220 is located in the first segment 1100, the first cavity 1110 is connected to the second cavity 1120 through the second channel 2212, and the spring 2240 pushes the second sealing member 2230 to block the first end of the first channel 2211.

[0026] During the process of the piston rod 2100 extending relative to the cylinder, when the first seal 2220 is located in the second section 1200, the first seal 2220 separates the first cavity 1110 from the second cavity 1120, and the second seal 2230 moves toward the side of the support member 2250 under the action of the gas pressure in the first cavity 1110, so that the first cavity 1110 is connected with the second cavity 1120 through the first channel 2211.

[0027] Specifically, the cylinder can be a sealing component, the accommodating chamber in the cylinder contains a certain amount of gas medium, and the piston assembly slides in the accommodating chamber to drive the gas medium in the cylinder to flow. Figure 3 A cross-sectional schematic diagram of a cylinder provided in an embodiment of the present application is shown in FIG. Figure 3 As shown, the cylinder includes a first segment 1100 and a second segment 1200 alternately arranged along the length of the cylinder. The length and number of the first segment 1100 and the second segment 1200 can be set according to specific needs, such as matching the opening angle of the side-opening tailgate. The above-mentioned ventilation valve 2210 can be a component with multiple ventilation holes, the above-mentioned first sealing member 2220 can be an elastic sealing ring, and the above-mentioned second sealing member 2230 can be an annular sealing gasket. The above-mentioned spring 2240 is in an elastically compressed state, that is, in the initial state, the spring 2240 has a certain amount of compression, that is, the spring 2240 will push the second sealing member 2230 to abut against the ventilation valve 2210.

[0028] For example, Figure 1 As shown, during the process of the piston rod 2100 extending relative to the cylinder, when the first sealing member 2220 is located in the first segment 1100, the movement direction of the piston rod 2100 is away from the spring 2240, and the gas medium in the cylinder enters the second cavity 1120 from the first cavity 1110. The spring 2240 pushes the second sealing member 2230 to block the first end of the first channel 2211. The gas medium in the cylinder cannot flow through the first channel 2211. The first cavity 1110 can be connected to the second cavity 1120 through the second channel 2212, and there is a certain distance between the ventilation valve 2210 and the inner wall of the cylinder, that is, the second segment 1200. At this time, the first cavity 1110 and the second cavity 1120 are in a state of mutual communication, and the pressures of the first cavity 1110 and the second cavity 1120 are the same.

[0029] In the above process, the force-bearing cross-sectional area of ​​the piston rod 2100 in the first cavity 1110 is smaller than the force-bearing cross-sectional area of ​​the piston rod 2100 in the second cavity 1120, and the area difference is the cross-sectional area of ​​the piston rod 2100. Since the pressures in the first cavity 1110 and the second cavity 1120 are the same, the pressure of the gas medium in the second cavity 1120 on the piston rod 2100 is greater than the pressure of the gas medium in the first cavity 1110 on the piston rod 2100. Therefore, the limiting device will provide a supporting force, which can be used to push the piston rod 2100 out of the cylinder. When friction is ignored, the supporting force is the product of the medium pressure in the limiting device and the cross-sectional area of ​​the piston rod 2100.

[0030] For example, Figure 2 As shown, during the process of the piston rod 2100 extending relative to the cylinder, when the first sealing member 2220 is located in the second segment 1200, the movement direction of the piston rod 2100 is away from the spring 2240. Affected by the movement of the piston rod 2100, the first sealing member 2220 is located at one end of the slide groove 2213 facing the second sealing member 2230. The first sealing member 2220 separates the first cavity 1110 from the second cavity 1120, and the gas medium in the cylinder cannot flow through the second channel 2212. Under the action of the gas pressure in the first cavity 1110, the second sealing member 2230 moves toward the side of the support member 2250, so that the first cavity 1110 is connected with the second cavity 1120 through the first channel 2211, and the gas medium in the cylinder can enter the second cavity 1120 from the first cavity 1110 through the first channel 2211.

[0031] In the above process, the movement of the second sealing member 2230 toward the side of the support member 2250 requires the pressure of the gas medium in the first cavity 1110 to overcome the spring 2240 force of the spring 2240. By pulling the piston rod 2100 to compress the medium in the first cavity 1110, the pressure in the first cavity 1110 is increased, and the medium in the first channel 2211 is connected to the medium in the first cavity 1110, and the pressures therebetween are equal. The pressure of the medium in the first channel 2211 increases as the pressure of the medium in the first cavity 1110 increases, so that the pressure of the medium in the first channel 2211 overcomes the spring 2240 force of the spring 2240. The force of further compressing the spring 2240 by pulling the piston rod 2100 and moving the medium from the first cavity 1110 to the second cavity 1120 is the limiting force of the limiting device.

[0032] Therefore, only when the force applied to the piston rod 2100 of the limiting device is greater than the limiting force in the above process, the limiting device can perform the extension movement. When the limiting device is assembled on the side-opening tailgate of the vehicle, the side-opening tailgate is connected to the piston rod 2100, and the tailgate needs to overcome the limiting force to open the tailgate.

[0033] In the embodiment of the present application, the above-mentioned limiting device includes a cylinder and a piston assembly, the cylinder is provided with a accommodating chamber, the piston assembly is arranged in the accommodating chamber, the cylinder is slidably connected to the piston assembly, the cylinder includes a first segment 1100 and a second segment 1200 alternately arranged along the length direction of the cylinder, the inner diameter of the first segment 1100 is larger than the inner diameter of the second segment, the piston assembly includes a piston rod 2100 and a limiting assembly, the limiting assembly divides the accommodating chamber into a first cavity 1110 and a second cavity 1120, the limiting assembly includes a ventilation valve 2210, a first sealing member 2220, a second sealing member 2230, a spring 2240 and a support member 2 250, the ventilation valve 2210, the second sealing member 2230, the spring 2240 and the support member 2250 are respectively sleeved on the piston rod 2100, and the ventilation valve 2210, the second sealing member 2230, the spring 2240 and the support member 2250 are arranged in sequence along the axial direction of the piston rod 2100; the ventilation valve 2210 and the support member 2250 are respectively fixedly connected to the piston rod 2100; the first end of the spring 2240 is fixedly connected to the second sealing member 2230, the second end of the spring 2240 is fixedly connected to the support member 2250, and the spring 2240 is in an elastically compressed state, The air valve 2210 includes a ventilation valve body, the outer side wall of the ventilation valve body is provided with an annular protrusion, the ventilation valve 2210 is provided with a first channel 2211, a second channel 2212 and a slide groove 2213, the first channel 2211, the second channel 2212 and the slide groove 2213 are respectively arranged along the axial direction of the piston rod 2100, the first channel 2211 passes through the ventilation valve body, the second channel 2212 is located at the annular protrusion, the slide groove 2213 is located at the outer side wall of the ventilation valve body, and the second channel 2212 is connected to the slide groove 2213, the first sealing member 2220 is slidably disposed in the slide groove 2213, and the The first seal 2220 at least partially extends out of the slide groove 2213; the second seal 2230 is opposite to the first end of the first channel 2211, so that when the limiting device is installed on the tailgate of the vehicle, during the process of the piston rod 2100 extending relative to the cylinder, if the first seal 2220 is located in the first section 1100, the limiting device will provide a supporting force to help open the tailgate. If the first seal 2220 is located in the second section 1200, it is necessary to overcome the limiting force of the limiting device to open the tailgate, so that the limiting device can provide a limiting function and an opening assistance function, thereby improving the convenience of user use.

[0034] Optionally, during the process of the piston rod 2100 retracting relative to the cylinder, the first cavity 1110 is connected to the second cavity 1120 through the second channel 2212 , and the spring 2240 pushes the second sealing member 2230 to block the first end of the first channel 2211 .

[0035] Specifically, during the process of the piston rod 2100 retracting relative to the cylinder, affected by the movement of the piston rod 2100, the first seal 2220 is located at the end of the slide groove 2213 facing away from the second seal 2230. During this process, no matter whether the first seal 2220 is located in the first segment 1100 or the second segment 1200, the first cavity 1110 can be connected to the second cavity 1120 through the second channel 2212. At this time, the first cavity 1110 and the second cavity 1120 are in a state of mutual communication, and the pressures of the first cavity 1110 and the second cavity 1120 are the same.

[0036] For example, Figure 4 This is a third schematic diagram of a cross-sectional structure of a limiting device provided in an embodiment of the present application, such as Figure 4 As shown, during the process of the piston rod 2100 retracting relative to the cylinder, the first cavity 1110 is connected to the second cavity 1120 through the second channel 2212, and the spring 2240 pushes the second sealing member 2230 to block the first end of the first channel 2211. Since the pressures of the first cavity 1110 and the second cavity 1120 are equal, the pressure of the medium in the second cavity 1120 on the piston rod 2100 is greater than the pressure of the medium in the first cavity 1110 on the piston rod 2100. Therefore, the limiting device will provide a supporting force, which is used to push the piston rod 2100 out of the cylinder. At this time, only by applying a force greater than the supporting force to the piston rod 2100 can the piston rod 2100 be closed, so that the piston rod 2100 can be compressed. When the friction force is ignored, the supporting force is the product of the medium pressure in the limiting device and the cross-sectional area of ​​the piston rod 2100.

[0037] In this embodiment, during the process of the piston rod 2100 retracting relative to the cylinder, the first cavity 1110 is connected to the second cavity 1120 through the second channel 2212, and the spring 2240 pushes the second seal 2230 to block the first end of the first channel 2211, so that when the limiting device is assembled on the side-opening tailgate of the vehicle, the side-opening tailgate is fixedly connected to the piston rod 2100. When the side-opening tailgate is opened, an operating force needs to be applied at the side-opening tailgate, and the force transmitted to the limiting device by the operating force needs to be greater than the supporting force provided by the limiting device, so that the side-opening tailgate can be compressed to close, thereby improving the stability of the limiting device in fixing the side-opening tailgate to prevent the side-opening tailgate from being closed at will, thereby further improving the convenience and safety of user use.

[0038] Optionally, when the first sealing member 2220 is located in the first section 1100 , a gap exists between the first side surface of the ventilation valve 2210 and the inner wall of the cylinder. The first side surface is the side surface of the ventilation valve 2210 on which the sliding groove 2213 is formed.

[0039] When the first sealing member 2220 is located in the second section 1200 , the first side surface of the ventilation valve 2210 is in contact with the inner wall of the cylinder, and the first sealing member 2220 is in contact between the inner wall of the cylinder and the slide groove 2213 .

[0040] Specifically, when the first sealing member 2220 is located in the first section 1100, a gap exists between the first side surface of the ventilation valve 2210 and the inner wall of the cylinder, and a gap exists between the first sealing member 2220 and the inner wall of the cylinder. In this state, the first cavity 1110 and the second cavity 1120 are interconnected. The first sealing member 2220 can be an elastic component. When the first sealing member 2220 is located in the second section 1200, the first sealing member 2220 is squeezed by the inner wall of the cylinder.

[0041] In this embodiment, when the first seal 2220 is located in the first section 1100, there is a gap between the first side of the ventilation valve 2210 and the inner wall of the cylinder. There is a gap between the first seal 2220 and the inner wall of the cylinder. The first side is the side of the ventilation valve 2210 on which the slide groove 2213 is opened. When the first seal 2220 is located in the second section 1200, the first side of the ventilation valve 2210 is in contact with the inner wall of the cylinder, and the first seal 2220 is in contact between the inner wall of the cylinder and the slide groove 2213, so that the ventilation position of the ventilation valve 2210 can be controlled by the position of the first seal 2220 and the second seal 2230, and then the pressure difference between the first cavity 1110 and the second cavity 1120 can be used to realize the limiting function and the auxiliary opening function of the limiting device, thereby further improving the convenience of user use.

[0042] Optionally, there is a gap between the first sealing member 2220 and the bottom of the sliding groove 2213;

[0043] When the piston rod 2100 extends relative to the cylinder, the first sealing member 2220 is located at the second end of the sliding groove 2213;

[0044] When the piston rod 2100 retracts relative to the cylinder, the first sealing member 2220 is located at the first end of the sliding groove 2213 .

[0045] Specifically, the first end may be an end of the slide groove 2213 facing away from the spring 2240 , and the second end may be an end of the slide groove 2213 facing toward the spring 2240 .

[0046] In this embodiment, there is a gap between the first sealing member 2220 and the bottom of the chute 2213. When the piston rod 2100 extends relative to the cylinder, the first sealing member 2220 is located at the second end of the chute 2213. When the piston rod 2100 retracts relative to the cylinder, the first sealing member 2220 is located at the first end of the chute 2213. When the piston rod 2100 retracts relative to the cylinder, the first sealing member 2220 is located at the first end of the chute 2213. When located in the second section 1200, the first cavity 1110 and the second cavity 1120 can be connected through the gap between the first seal 2220 and the bottom of the slide groove 2213, so that during the retraction of the piston rod 2100 relative to the cylinder, the pressures of the first cavity 1110 and the second cavity 1120 remain the same. When the tailgate of the vehicle needs to be closed, an operating force greater than the supporting force provided by the limiting device must always be applied at the side-opening tailgate in order to close the side-opening tailgate, thereby further improving the safety of user use.

[0047] Optionally, the ventilation valve 2210 is provided with at least two first channels 2211, at least two second channels 2212 and at least two slide grooves 2213, and the limiting assembly includes at least two first seals 2220, and the at least two first seals 2220 correspond one-to-one to the at least two slide grooves 2213, and the at least two first seals 2220 can be slidably arranged in the corresponding slide grooves 2213 respectively.

[0048] Specifically, the above-mentioned ventilation valve 2210 can also be provided with multiple first channels 2211, multiple second channels 2212 and multiple slide grooves 2213, the number of the first channels 2211, the second channels 2212 and the slide grooves 2213 are the same, and each second channel 2212 is respectively connected to the corresponding slide groove 2213.

[0049] Optionally, the at least two first channels 2211 are symmetrically arranged about the piston rod 2100 , the at least two second channels 2212 are symmetrically arranged about the piston rod 2100 , and the at least two sliding grooves 2213 are symmetrically arranged about the piston rod 2100 .

[0050] Exemplarily, when three first channels 2211, two second channels 2212 and three slide grooves 2213 are set, the symmetrical arrangement of the at least two slide grooves 2213 about the piston rod 2100 can be understood as, the center lines of the three first channels 2211, the three second channels 2212 and the three slide grooves 2213 respectively form equilateral triangles, and the piston rod 2100 is located at the center of the equilateral triangle.

[0051] In this embodiment, the at least two first channels 2211 are symmetrically arranged about the piston rod 2100, the at least two second channels 2212 are symmetrically arranged about the piston rod 2100, and the at least two slide grooves 2213 are symmetrically arranged about the piston rod 2100, so that the gas medium flows more evenly during the movement of the piston rod 2100, thereby improving the limiting effect and opening assistance effect of the limiting device.

[0052] Optionally, the limiting assembly further includes at least one first nut 2260, which is threadedly connected to the piston rod 2100, and the first nut 2260 is arranged on the side of the support member 2250 facing away from the spring 2240, and the first nut 2260 abuts against the support member 2250.

[0053] Specifically, when the limiting assembly further includes a plurality of first nuts 2260 , the plurality of first nuts 2260 may be symmetrically arranged with respect to the piston rod 2100 , and the first nuts 2260 may be screwed onto the piston rod 2100 .

[0054] In this embodiment, the limiting assembly also includes at least one first nut 2260, which is threadedly connected to the piston rod 2100. The first nut 2260 is arranged on the side of the second seal 2230 facing away from the spring 2240. The first nut 2260 abuts against the second seal 2230, so that the first nut 2260 can prevent the support member 2250 from loosening, thereby improving the stability of the limiting device.

[0055] An embodiment of the present application also provides a tailgate device, comprising a tailgate body and the limiting device described in the above embodiment, wherein the first end of the limiting device is fixedly connected to the tailgate body, and the second end of the limiting device is used to be fixedly connected to the vehicle body.

[0056] In this embodiment, since the tailgate device includes the limiting device described in the above embodiment, the tailgate device can realize various use processes of the above limiting device and has the same beneficial effects. To avoid repetition, they will not be described again here.

[0057] An embodiment of the present application further provides a vehicle, comprising the tailgate device described in the above embodiment.

[0058] In this embodiment, since the vehicle includes the tailgate device described in the above embodiment, the vehicle can implement various usage processes of the above tailgate device and has the same beneficial effects. To avoid repetition, they will not be described here.

[0059] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0060] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a more preferred embodiment. Based on this understanding, the technical solution of this application, or the part that contributes to the existing technology, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a number of instructions for enabling a terminal (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in each embodiment of this application.

[0061] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

Claims

1. A limiting device, characterized in that: It comprises a cylinder and a piston assembly, wherein the cylinder is provided with an accommodating cavity, the piston assembly is arranged in the accommodating cavity, and the cylinder is slidably connected to the piston assembly; The cylinder comprises a first segment and a second segment alternately arranged along the length direction of the cylinder, wherein the inner diameter of the first segment is larger than the inner diameter of the second segment; The piston assembly includes a piston rod and a limiting assembly, the limiting assembly divides the accommodating chamber into a first cavity and a second cavity, the limiting assembly includes a ventilation valve, a first sealing member, a second sealing member, a spring and a support member, the ventilation valve, the second sealing member, the spring and the support member are respectively sleeved on the piston rod, and the ventilation valve, the second sealing member, the spring and the support member are sequentially arranged along the axial direction of the piston rod; the ventilation valve and the support member are respectively fixedly connected to the piston rod; the first end of the spring is fixedly connected to the second sealing member, the second end of the spring is fixedly connected to the support member, and the spring is in an elastically compressed state; The ventilation valve includes a ventilation valve body, an outer side wall of the ventilation valve body is provided with an annular protrusion, the ventilation valve is provided with a first channel, a second channel and a slide groove, the first channel, the second channel and the slide groove are respectively arranged along the axis direction of the piston rod, the first channel passes through the ventilation valve body, the second channel is located at the annular protrusion, the slide groove is located at the outer side wall of the ventilation valve body, and the second channel is connected to the slide groove, the first sealing member is slidably provided in the slide groove, and the first sealing member at least partially extends out of the slide groove; the second sealing member is opposite to the first end of the first channel; During the process of the piston rod extending relative to the cylinder, when the first sealing member is located in the first segment, the first cavity is connected to the second cavity through the second channel, and the spring pushes the second sealing member to seal the first end of the first channel; During the process of the piston rod extending relative to the cylinder, when the first seal is located in the second section, the first seal separates the first cavity from the second cavity, and the second seal moves toward the side of the support member under the action of the gas pressure in the first cavity, so that the first cavity is connected to the second cavity through the first channel.

2. The limiting device according to claim 1, characterized in that: During the process of the piston rod retracting relative to the cylinder, the first cavity is communicated with the second cavity through the second channel, and the spring pushes the second sealing member to seal the first end of the first channel.

3. The limiting device according to claim 1, characterized in that: When the first sealing member is located in the first section, a gap exists between the first side surface of the ventilation valve and the inner wall of the cylinder, and the first side surface is the side surface of the ventilation valve where the sliding groove is formed. When the first sealing member is located in the second section, the first side surface of the ventilation valve is in contact with the inner wall of the cylinder, and the first sealing member is in contact between the inner wall of the cylinder and the sliding groove.

4. The limiting device according to claim 3, characterized in that: There is a gap between the first sealing member and the bottom of the chute; When the piston rod extends relative to the cylinder, the first sealing member is located at the second end of the sliding groove; When the piston rod is retracted relative to the cylinder, the first sealing member is located at the first end of the sliding groove.

5. The limiting device according to claim 1, characterized in that: The ventilation valve is provided with at least two first channels, at least two second channels and at least two slide grooves. The limiting assembly includes at least two first seals. The at least two first seals correspond one-to-one to the at least two slide grooves. The at least two first seals are respectively slidably arranged in the corresponding slide grooves.

6. The limiting device according to claim 5, characterized in that: The at least two first channels are symmetrically arranged with respect to the piston rod, the at least two second channels are symmetrically arranged with respect to the piston rod, and the at least two sliding grooves are symmetrically arranged with respect to the piston rod.

7. The limiting device according to claim 1, characterized in that: The limiting assembly further includes at least one first nut, which is threadedly connected to the piston rod. The first nut is arranged on a side of the support member facing away from the spring, and the first nut abuts against the support member.

8. A tailgate device, characterized in that: It comprises a tailgate body and the limiting device according to any one of claims 1 to 7, wherein the first end of the limiting device is fixedly connected to the tailgate body, and the second end of the limiting device is used to be fixedly connected to the vehicle body.

9. A vehicle, characterized in that: The invention comprises the tailgate device according to claim 8.

Images