Two-stage buffer shock absorber

Abstract

The utility model relates to the technical field of automobile shock absorbers, in particular to a secondary buffer shock absorber which comprises a shock absorption spring, a damper, an automobile body connecting seat and a chassis connecting seat, the automobile body connecting seat comprises a base and a movable seat, and the lower side of the base is connected with the shock absorption spring. The movable seat is arranged on the upper side of the base and can move up and down relative to the base, the movable seat is used for being connected with a vehicle body, and an auxiliary buffering assembly is arranged between the movable seat and the base so that the movable seat can extrude the auxiliary buffering assembly when the base downwards presses the shock absorption spring. And the auxiliary buffering assembly is used for providing secondary buffering for the movable seat. When the shock absorption spring and the damper achieve primary buffering, secondary buffering is provided by the interior of the vehicle body connecting base, so that secondary buffering of the shock absorber is achieved, the structure is simplified, and the comfort of a user is improved.

Description

Technical Field

[0001] This utility model relates to the field of automotive shock absorber technology, specifically to a two-stage shock absorber. Background Technology

[0002] Automotive shock absorbers consist of springs and dampers. Dampers suppress the oscillations caused by the spring's absorption of shocks and the impact from the road surface. Widely used in automobiles, shock absorbers reduce vibrations between the chassis and body, improving ride comfort. Ordinary shock absorbers are single-stage damping devices; the absorbing spring only provides initial stiffness. If the impact exceeds the damping limit, it causes hard contact between the shock absorber and the vehicle body, resulting in direct impact, affecting the driving experience, and easily damaging the shock absorber.

[0003] Existing technology employs a two-stage damping system using a two-stage stiffness absorbing spring. The upper part of the absorbing spring provides primary stiffness, while the lower part provides secondary stiffness. Under minor road impacts, the primary stiffness works in conjunction with a damper to reduce vibration. Under heavier impacts, exceeding the primary stiffness, the secondary stiffness also works with the damper to reduce vibration, thus achieving two-stage damping. However, the two-stage stiffness absorbing spring has a complex structure and high cost; the abrupt stiffness change area poses a risk of stress concentration, resulting in lower reliability and fatigue life; and the abrupt stiffness change may cause instantaneous impacts, affecting comfort. Utility Model Content

[0004] The purpose of this utility model is to provide a solution that solves the problems of cost, reliability, and comfort caused by providing secondary buffering through a secondary stiffness shock-absorbing spring. By setting the body connecting seat as a base and a movable seat with a sliding connection, and providing an auxiliary buffer component between the base and the movable seat, the shock-absorbing spring and damper can achieve primary buffering while the body connecting seat provides secondary buffering, thereby realizing secondary buffering and shock absorption of the shock absorber, simplifying the structure and improving user comfort.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: a two-stage shock absorber, comprising a shock-absorbing spring, a damper, a body connecting seat, and a chassis connecting seat. The body connecting seat includes a base and a movable seat. The shock-absorbing spring is connected to the lower side of the base. The movable seat is located on the upper side of the base and can move up and down relative to the base. The movable seat is used to connect to the vehicle body. An auxiliary buffer assembly is provided between the movable seat and the base so that the movable seat compresses the auxiliary buffer assembly when the shock-absorbing spring is pressed down by the base. The auxiliary buffer assembly is used to provide secondary buffering to the movable seat.

[0006] In one embodiment, the base includes a base plate and a guide post fixed to the upper side of the base plate. The movable seat is provided with a guide cavity, which is sleeved on the guide post so that the guide cavity can move up and down along the guide post.

[0007] In one embodiment, the upper end of the guide post is provided with a first stop portion, and the lower end of the guide cavity is provided with a second stop portion. The first stop portion and the second stop portion are vertically corresponding to each other to prevent the movable seat from completely detaching from the base.

[0008] In one embodiment, both the first stop and the second stop are provided with sealing rings on their outer peripheries. The first stop abuts against the inner wall of the guide cavity through the sealing rings, and the second stop abuts against the outer wall of the guide post through the sealing rings, so that the guide post and the guide cavity are in flexible contact.

[0009] In one embodiment, the auxiliary buffer assembly includes at least one set of magnetically repulsive first magnetic elements and second magnetic elements. The first magnetic element is disposed on the upper side of the substrate, and the second magnetic element is disposed on the lower side of the movable seat. The first magnetic element and the second magnetic element are arranged vertically corresponding to each other, so that the base flexibly supports the movable seat through magnetic force.

[0010] In one embodiment, the upper side of the substrate is provided with a first receiving groove, the lower side of the movable seat is provided with a second receiving groove, the first magnetic element is disposed in the first receiving groove and its upper side is flush with the upper side of the substrate, and the second magnetic element is disposed in the second receiving groove and its lower side is flush with the lower side of the movable seat.

[0011] In one embodiment, the auxiliary cushioning assembly includes an airbag connected to the upper side of the substrate and / or the lower side of the movable seat, so that the base flexibly supports the movable seat through the airbag.

[0012] In one embodiment, the upper side of the substrate is provided with a third receiving groove, and the lower side of the movable seat is provided with a fourth receiving groove. In the initial state, part of the space of the third receiving groove and part of the space of the fourth receiving groove are occupied by the airbag.

[0013] In one embodiment, the guide post is located at the center of the substrate, and the auxiliary buffer assembly is uniformly arranged around the circumference of the guide post.

[0014] The advantages of this application compared to the prior art are:

[0015] In this embodiment, on the one hand, the damper and shock-absorbing spring still adopt a conventional design to obtain primary buffering, eliminating the need for a complex secondary stiffness shock-absorbing spring. This reduces costs, avoids stress concentration risks, improves the reliability and fatigue life of the shock-absorbing spring, and avoids instantaneous impacts caused by sudden stiffness changes. On the other hand, by setting the vehicle body connecting seat to include two parts, a base and a movable seat, and setting an auxiliary buffer assembly between the base and the movable seat to obtain secondary buffering, the structure is simple and low-cost. Moreover, the auxiliary buffer assembly and the shock-absorbing spring damper produce buffering effects simultaneously without any sequential relationship, and there is no sudden stiffness change. Therefore, the shock absorber ultimately obtains a damping effect that combines primary and secondary buffering. Compared to the secondary buffering produced by the secondary stiffness shock-absorbing spring with a sequential relationship, the user experience is more comfortable. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the planar structure of a two-stage buffer shock absorber in an embodiment of this application;

[0018] Figure 2 This is a schematic diagram illustrating the connection relationship between the base and the movable seat in an embodiment of this application;

[0019] Figure 3 This is a schematic diagram of the first stop and the second stop in the embodiments of this application;

[0020] Figure 4 This is a schematic diagram illustrating one embodiment of the auxiliary buffer component in this application.

[0021] Figure 5 This is a schematic diagram illustrating one embodiment of the auxiliary buffer component in this application. Detailed Implementation

[0022] The terms “first,” “second,” “third,” etc., are used only for distinguishing descriptions and do not indicate a sequence number, nor should they be interpreted as indicating or implying relative importance.

[0023] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0024] In the description of this application, it should be noted that the terms "inner", "outer", "left", "right", "upper", "lower", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0025] In the description of this application, unless otherwise expressly specified and limited, the terms “set up,” “install,” “connect,” and “link” shall be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection; as a mechanical connection or an electrical connection; as a direct connection or an indirect connection through an intermediate medium; or as a connection within two components.

[0026] The technical solution of this application will now be clearly and completely described with reference to the accompanying drawings.

[0027] Please refer to Figure 1 This application discloses a two-stage shock absorber, including a shock-absorbing spring 300, a damper 400, a body connecting seat 100, and a chassis connecting seat 200. The shock-absorbing spring 300 is sleeved around the damper 400. The shock-absorbing spring 300 absorbs shocks and deforms. The damper 400 pulls the shock-absorbing spring 300 to prevent its repeated bouncing. The chassis connecting seat 200 is located at the lower end of the shock absorber for connecting to the chassis, and the body connecting seat 100 is located at the upper end of the shock absorber for connecting to the vehicle body. The orientation descriptions in this specification are based on the shock absorber being in a vertical position, in which the chassis connecting seat 200 is at the lower end and the body connecting seat 100 is at the upper end. The initial state of the shock absorber in this specification refers to the state where the shock absorber is compressed by the weight of the vehicle body but not impacted by the road surface.

[0028] The difference between this embodiment and the prior art lies in the following aspects: Firstly, the vehicle body connecting seat 100 includes a base 110 and a movable seat 120. The base 110 is connected to the lower side of the shock-absorbing spring 300, and the movable seat 120 is located on the upper side of the base 110 and can move up and down relative to the base 110. The movable seat 120 is used to connect the vehicle body. Therefore, for the shock-absorbing spring 300 and the damper 400, when the vehicle is impacted, the base 110 and the movable seat 120 still act as a whole to compress the shock-absorbing spring 300 and the damper 400, so that the shock-absorbing spring 300 and the damper 400 together provide buffering and shock absorption for the base 110 and the movable seat 120, thus achieving buffering and shock absorption for the vehicle body. This is the first-stage buffering of the shock absorber. Secondly, a connection is provided between the movable seat 120 and the base 110. In the initial state of the shock absorber, the auxiliary buffer assembly 130 is compressed to a certain extent by the pressure of the vehicle body weight on the shock absorber. However, the auxiliary buffer assembly 130 still has room for further compression deformation. It plays a role when the shock absorber is impacted by the road surface. Specifically, when the shock absorber is impacted by the road surface, the movable seat 120 and the base 110 together compress the shock-absorbing spring 300, producing a primary buffering effect. During the process of the movable seat 120 and the base 110 compressing the shock-absorbing spring 300 as a whole, the shock-absorbing spring 300 and the vehicle body together compress the vehicle body connecting seat 100, causing the auxiliary buffer assembly 130 to be further compressed and deformed, so that the movable seat 120 and the base 110 move closer to each other. At this time, the base 110 provides buffering for the movable seat 120 through the auxiliary buffer assembly 130, that is, producing a secondary buffering effect.

[0029] Therefore, in this embodiment, on the one hand, the damper 400 and the shock-absorbing spring 300 still adopt a common design to obtain primary buffering, without the need for a complex secondary stiffness shock-absorbing spring 300, thereby reducing costs, avoiding stress concentration risks, improving the reliability and fatigue life of the shock-absorbing spring 300, and avoiding instantaneous impacts caused by sudden stiffness changes; on the other hand, by setting the body connecting seat 100 to include two parts, a base 110 and a movable seat 120, and setting an auxiliary buffer assembly 130 between the base 110 and the movable seat 120 to obtain secondary buffering, the structure is simple and the cost is low. Moreover, the auxiliary buffer assembly 130 and the shock-absorbing spring 300 and damper 400 produce buffering effects simultaneously without any sequential relationship, and there is no sudden stiffness change. Therefore, the shock absorber finally obtains the damping effect of primary and secondary buffering superimposed on each other. Compared with the secondary buffering produced by the secondary stiffness shock-absorbing spring 300 which has a sequential order, the user experience is more comfortable.

[0030] Please refer to Figure 2In this embodiment, the base 110 includes a base plate 111 and a guide post 112 fixed to the upper side of the base plate 111. The movable seat 120 has a guide cavity 121, which is sleeved on the guide post 112, so that the guide cavity 121 can move up and down along the guide post 112. The base 110 and the movable seat 120 are slidably connected through the sleeved relationship of the guide post 112 and the guide cavity 121, so that the movable seat 120 can move up and down along the guide post 112. The degrees of freedom of the movable seat 120 in other directions are restricted by the guide post 112, and the guide post 112 supports the movable seat 120 from the inside to the outside, thereby ensuring the stability and reliability of the movable seat 120. In one specific embodiment, a guide post 112 is provided at the center of the substrate 111, and a guide cavity 121 is provided at the center of the movable seat 120. In this case, the width of the guide post 112 and the guide cavity 121 can be selected to be relatively large. For example, the maximum width of the guide cavity 121 is 60%-80% of the maximum width of the movable seat 120, and the maximum width of the guide post 112 is 30%-60% of the maximum width of the substrate 111. In another embodiment, multiple discrete guide posts 112 are provided on the substrate 111, and the movable seat 120 is provided with the same number of discrete guide cavities 121. In this case, considering the arrangement problem, a small-sized guide post 112 needs to be selected. The present application embodiment prefers the former embodiment, because the structure of the larger-sized guide post 112 is more stable, and only one place needs to be considered for tight fit, reducing the difficulty of processing and manufacturing.

[0031] Furthermore, in the embodiment where the guide post 112 is located at the center of the base plate 111, the auxiliary buffer assembly 130 is preferably evenly arranged around the circumference of the guide post 112, so that the auxiliary buffer assembly 130 can fully and evenly flexibly support the movable seat 120, thereby improving the secondary buffering effect of the shock absorber.

[0032] Please refer to Figure 3Furthermore, in this embodiment, the upper end of the guide column 112 is provided with a first stop 1121, and the lower end of the guide cavity 121 is provided with a second stop 1211. The first stop 1121 and the second stop 1211 correspond vertically to prevent the movable seat 120 from completely detaching from the base 110. That is, when the shock absorber is re-extended after compression, both the movable seat 120 and the base 110 are pushed upward, and the auxiliary buffer assembly 130 also re-extends. At this time, the vehicle body undulates upward, causing the movable seat 120 to move away from the base plate 111. At this time, the base 110 blocks the second stop 1211 through the first stop 1121, thereby preventing the movable seat 120 from completely detaching from the base 110, avoiding safety risks, and suppressing excessive undulation of the vehicle body through such a pulling effect. In some embodiments, a soft pad layer, such as a rubber pad, may be provided on the contact surfaces of the first stop portion 1121 and the second stop portion 1211 to reduce the hard impact between the base 110 and the movable seat 120 and improve the user experience.

[0033] Furthermore, in this embodiment, both the first stop 1121 and the second stop 1211 are provided with sealing rings 140 on their outer peripheries. The first stop 1121 abuts against the inner wall of the guide cavity 121 through the sealing ring 140, and the second stop 1211 abuts against the outer wall of the guide post 112 through the sealing ring 140, so that there is a flexible contact between the guide post 112 and the guide cavity 121, reducing the wear between the guide post 112 and the guide cavity 121. In addition, the sealing ring 140 has a large friction force during sliding, which can also play a certain role in buffering and shock absorption, improving the overall secondary buffering effect of the vehicle body connecting seat 100.

[0034] Please refer to Figure 4 In one embodiment of this application, the auxiliary buffer assembly 130 includes at least one set of magnetically repelling first magnetic elements 131 and second magnetic elements 132. The first magnetic element 131 is disposed on the upper side of the base plate 111, and the second magnetic element 132 is disposed on the lower side of the movable seat 120. The first magnetic element 131 and the second magnetic element 132 are arranged vertically correspondingly so that the base plate 110 flexibly supports the movable seat 120 through magnetic force. In this embodiment, in the initial state, the movable seat 120 is magnetically levitated above the base plate 111 of the base plate 110. When the shock absorber is impacted by the road surface, the movable seat 120 moves closer to the base plate 111. At this time, the magnetic force provides secondary buffering for the movable seat 120, thereby achieving secondary buffering of the vehicle body. Moreover, the buffering effect of the magnetic force is relatively gentle, which can improve the user experience.

[0035] Furthermore, the upper side of the substrate 111 is provided with a first receiving groove 1111, and the lower side of the movable seat 120 is provided with a second receiving groove 122. The first magnetic element 131 is disposed in the first receiving groove 1111, and the upper side of the first magnetic element 131 is flush with the upper side of the substrate 111. The second magnetic element 132 is disposed in the second receiving groove 122, and the lower side of the second magnetic element 132 is flush with the lower side of the movable seat 120. In this way, when the shock absorber is subjected to a large impact and the movable seat 120 approaches or touches the substrate 111, the contact between them is a plane-to-plane collision, which protects the movable seat 120, the substrate 111, the first magnetic element 131, and the second magnetic element 132.

[0036] Please refer to Figure 5 In one embodiment of this application, the auxiliary buffer assembly 130 includes an airbag 133. The airbag 133 is connected to the upper side of the base plate 111 and / or the lower side of the movable seat 120, so that the base plate 110 flexibly supports the movable seat 120 through the airbag 133. When the shock absorber is impacted by the road surface, the movable seat 120 moves closer to the base plate 111, and the airbag 133 is further compressed and deformed. The airbag 133 provides secondary buffering for the movable seat 120, thereby achieving secondary buffering of the vehicle body. Moreover, the buffering effect of the airbag 133 is relatively gentle, which can improve the user experience.

[0037] Furthermore, a third receiving groove 1112 is provided on the upper side of the substrate 111, and a fourth receiving groove 123 is provided on the lower side of the movable seat 120. In the initial state, part of the space in the third receiving groove 1112 and part of the space in the fourth receiving groove 123 are occupied by the airbag 133. Thus, when the airbag 133 is further compressed, the remaining space in the third receiving groove 1112 and the fourth receiving groove 123 can accommodate the partially expanded part of the airbag 133, that is, provide deformation space for the airbag 133, and play a protective role for the airbag 133. Especially when a large impact causes the movable seat 120 to approach the substrate 111 at its limit or directly contact and collide with the substrate 111, the space left for the deformation of the airbag 133 between the movable seat 120 and the substrate 111 is very small. At this time, the third receiving groove 1112 and the fourth receiving groove 123 mainly provide space for the deformation of the airbag 133, reducing the risk that the airbag 133 will be directly burst due to insufficient deformation space.

[0038] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A two-stage shock absorber, comprising a shock-absorbing spring, a damper, a body mounting bracket, and a chassis mounting bracket, characterized in that, The vehicle body connecting seat includes a base and a movable seat. The shock-absorbing spring is connected to the lower side of the base. The movable seat is located on the upper side of the base and can move up and down relative to the base. The movable seat is used to connect the vehicle body. An auxiliary buffer assembly is provided between the movable seat and the base so that the movable seat compresses the auxiliary buffer assembly when the shock-absorbing spring is pressed down by the base. The auxiliary buffer assembly is used to provide secondary buffering to the movable seat.

2. The two-stage buffer shock absorber according to claim 1, characterized in that, The base includes a base plate and a guide post fixed to the upper side of the base plate. The movable seat is provided with a guide cavity, which is sleeved on the guide post so that the guide cavity can move up and down along the guide post.

3. A two-stage shock absorber according to claim 2, characterized in that, The upper end of the guide post is provided with a first stop, and the lower end of the guide cavity is provided with a second stop. The first stop and the second stop are vertically corresponding to each other to prevent the movable seat from completely detaching from the base.

4. A two-stage buffer shock absorber according to claim 3, characterized in that, Both the first stop and the second stop are provided with sealing rings on their outer peripheries. The first stop is attached to the inner wall of the guide cavity through the sealing ring, and the second stop is attached to the outer wall of the guide post through the sealing ring, so that the guide post and the guide cavity are in flexible contact.

5. A two-stage shock absorber according to claim 1, characterized in that, The auxiliary buffer assembly includes at least one set of magnetically repulsive first magnetic elements and second magnetic elements. The first magnetic element is disposed on the upper side of the substrate, and the second magnetic element is disposed on the lower side of the movable seat. The first magnetic element and the second magnetic element are arranged vertically corresponding to each other, so that the base flexibly supports the movable seat through magnetic force.

6. A two-stage buffer shock absorber according to claim 5, characterized in that, The upper side of the substrate is provided with a first receiving groove, and the lower side of the movable seat is provided with a second receiving groove. The first magnetic component is disposed in the first receiving groove and its upper side is flush with the upper side of the substrate. The second magnetic component is disposed in the second receiving groove and its lower side is flush with the lower side of the movable seat.

7. A two-stage shock absorber according to claim 1, characterized in that, The auxiliary buffer assembly includes an airbag connected to the upper side of the base plate and / or the lower side of the movable seat, so that the base flexibly supports the movable seat through the airbag.

8. A two-stage shock absorber according to claim 7, characterized in that, The upper side of the substrate is provided with a third receiving groove, and the lower side of the movable seat is provided with a fourth receiving groove. In the initial state, part of the space of the third receiving groove and part of the space of the fourth receiving groove are occupied by the airbag.

9. A two-stage buffer shock absorber according to claim 1, characterized in that, The guide post is located at the center of the substrate, and the auxiliary buffer assembly is evenly arranged around the circumference of the guide post.

Images