CN220726961U - Lower limit buffer structure of bidirectional cylinder type shock absorber - Google Patents

Abstract

The utility model discloses a lower limit buffer structure of a bidirectional cylinder type shock absorber, which is characterized by comprising the following components: the limiting cylinder is arranged between the bottom cylinder and the inner cylinder of the shock absorber, the limiting cylinder and the limiting piston arranged at the end part of the piston rod form a relatively airtight cavity, a plurality of damping holes used for communicating the cavity with the bottom cylinder are further formed in the limiting piston, and the total sum of the diameters of the damping holes is reduced along with the gradual insertion of the limiting piston into the bottom cylinder, so that the damping force of the piston rod when approaching to the lower limit position is changed. A limiting cylinder is arranged between the bottom cylinder and the inner cylinder, and a limiting piston arranged at the end part of the piston rod is matched to form an independent damping mechanism, so that the piston rod obtains additional damping force which can be independently adjusted when approaching to the lower limit position.

Description

Lower limit buffer structure of bidirectional cylinder type shock absorber

Technical Field

The utility model relates to the field of vibration dampers, in particular to a lower limit buffer structure of a bidirectional cylinder type vibration damper.

Background

Because the vehicle weight of most new energy vehicles is greater than that of fuel vehicles, the kinetic energy of the vehicles at the same speed is increased, and higher requirements are put on the vibration reduction capability of the suspension. One common technique is to adjust the ultimate damping performance of the suspension by changing the poundage of the coil spring, and another technique is to improve the damping performance by modifying the main piston structure. In the first approach, too high a spring pound would transmit the fine vibrations of the vehicle while driving into the room, reducing ride comfort. In the second scheme, the main piston has a complex structure, so that the modification cost is high. In addition, the adjustment of the two schemes can change the full stroke damping of the shock absorber, and the damping force at the limit position of the compression (downward) stroke cannot be independently adjusted.

Disclosure of Invention

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

a bi-directional barrel shock absorber lower limit cushioning structure comprising: the limiting cylinder is arranged between the bottom cylinder and the inner cylinder of the shock absorber, the limiting cylinder and the limiting piston arranged at the end part of the piston rod form a relatively airtight cavity, a plurality of damping holes used for communicating the cavity with the bottom cylinder are further formed in the limiting piston, and the total sum of the diameters of the damping holes is reduced along with the gradual insertion of the limiting piston into the bottom cylinder, so that the damping force of the piston rod when the piston rod is close to the lower limit position is changed.

In a preferred embodiment of the present utility model, the limiting piston has an extension portion extending toward the bottom cylinder, an extension through hole communicating with an end portion of the extension portion is provided at a center of the extension portion, and a plurality of damping holes connected to the extension through hole through a sidewall are further provided on the extension portion, and the plurality of damping holes and the extension through hole form a flow path between the cavity and the bottom cylinder and are gradually closed as the limiting piston is gradually inserted into the bottom cylinder.

In a preferred embodiment of the present utility model, the inner diameter of the limiting cylinder is smaller than the inner diameter of the inner cylinder, and an outer sealing ring for sealing in contact with the inner wall of the inner cylinder is arranged on the outer periphery of the body of the limiting piston, so that the cavity is formed.

In a preferred embodiment of the utility model, there is further included a one-way valve structure provided on the bottom wall of the spacing cylinder, said one-way valve structure permitting only liquid flow from said bottom cylinder through the one-way valve structure into said cavity.

In a preferred embodiment of the present utility model, a retainer ring is disposed on the bottom wall, and a flange portion of the retainer ring covers a plurality of oil return holes that are also disposed on the bottom wall and are used for communicating the limiting cylinder and the bottom cylinder in a unidirectional manner, so that liquid can only push the flange portion from the oil return hole side to enter the limiting cylinder, thereby forming the unidirectional valve structure.

In a preferred embodiment of the present utility model, further comprising: the pretension piece is arranged on the lower end face of the bottom wall and connected with the support frame fixed at the lower end of the retainer ring, so that pretension force is provided to enable the flanging part to be clung to the upper end face of the bottom wall.

In a preferred embodiment of the utility model, one side of the pretension is further provided with an inner seal in close abutment with the bottom wall.

In a preferred embodiment of the present utility model, an oil sump through hole communicating between the bottom cylinder and the outer cylinder is provided at an outer periphery of the limiting cylinder.

The utility model has the beneficial effects that:

according to the lower limit buffer structure of the bidirectional cylinder type shock absorber, the limit cylinder is arranged between the bottom cylinder and the inner cylinder, and the limit piston arranged at the end part of the piston rod in a matched mode forms an independent damping mechanism, so that the piston rod can obtain additional damping force which can be independently adjusted when approaching to the lower limit position.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.

Fig. 1 is a cross-sectional view of the present utility model.

Fig. 2 is a schematic structural view of the stopper piston.

Fig. 3 is a schematic structural view of the limiting cylinder.

Fig. 4 is a schematic structural view of the retainer ring.

Fig. 5 is a schematic diagram of the relationship of the retainer ring and the check piston.

Fig. 6 is a second cross-sectional view of the present utility model.

Detailed Description

In the description of the present utility model, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate an azimuth or a positional relationship based on that shown in the drawings, and that the longitudinal (X-direction) "" lateral (Y-direction) "" vertical (Z-direction) "is a spatial coordinate system term of the automotive field, are terms of art well known to those skilled in the art, and the above description is for convenience of description of the present utility model, not for indicating or implying that the apparatus or element to be referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and therefore should not be construed as limiting the present utility model.

Exemplary embodiments of the present application will be described below with reference to the accompanying drawings. It should be understood, however, that this application may be presented in many different ways and is not limited to the embodiments described below. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide yet additional embodiments. Throughout the drawings, like reference numbers indicate identical or functionally identical elements.

Referring to fig. 1, a lower limit buffer structure of a bidirectional cylinder type shock absorber mainly comprises a piston rod 11 axially moving inside an inner cylinder 12, and a limit piston 30 is arranged at the end part of the piston rod 11. A limiting cylinder 40 is arranged between the bottom cylinder 20 and the inner cylinder 12, and the limiting cylinder 40 is matched with a one-way valve 50 at the bottom of the limiting cylinder to enable the limiting piston 30 to enter a space of the limiting piston to form a closed damping mechanism, so that damping force applied to the piston rod 11 in the stroke range is changed.

Fig. 2 shows a structure of a limiting piston, wherein the front end of a body 31 is provided with an extending part 32 extending forwards, the center of the extending part 32 is provided with an extending through hole 34 communicated with an end part 33, and the side wall of the extending part is provided with a plurality of damping holes 35 communicated with the extending through hole 34.

Fig. 3 shows the structure of the limiting cylinder, the center of the bottom wall 45 is provided with a cylinder body through hole 41 through which the extension part 32 passes, and a plurality of oil return holes 51 are also arranged in the circumferential direction, and a check valve 50 which only allows oil to flow from bottom to top is formed by matching with a check ring 52. The outer periphery of the limiting cylinder 40 is also provided with a plurality of oil sump through holes 42 which form the flow of oil between the inner cylinder 12 and the outer cylinder 13.

Fig. 4 shows the structure of the retainer, the cross section of the retainer 52 is T-shaped, and by tightly attaching the flange portion 53 extending in the circumferential direction thereof to the bottom wall 45, the oil can only pass through the oil return hole 51 from the lower side and push away the flange portion 53 to perform unidirectional flow.

Referring to fig. 5 and 6 in combination, the bottom of the retainer 52 is provided with an annular support bracket 56, and the flange portion 53 is brought into close contact with the bottom wall upper end surface 46 by disposing a pre-tightening member 55 between the support bracket 56 and the bottom wall lower end surface 47. An inner sealing ring 54 is also provided on the upper side of the pre-tightening member 55 to ensure sealing between the retainer ring 52 and the cylinder through-hole 41. In one embodiment, the pre-tension member 55 is a bellows spring and the support bracket 56 is an annular metal retainer ring. Because the inner diameter of the inner wall 44 is smaller than that of the inner tube 12, when the stopper piston 30 enters the stopper cylinder 40, the upper end of the stopper cylinder 40 is sealed by the outer seal ring 36 provided on the outer periphery of the body 31, and the lower end of the stopper cylinder 40 is sealed by the extension 32 and the check valve 50 to form a relatively airtight cavity 46. The oil in the cavity can only enter the bottom cylinder 20 through the damping hole 35 and the extending through hole 34. The extension 32 is inserted into the bottom cylinder 20 through the retainer through hole 57 as the piston rod 11 moves, and the damping force provided by the shock absorber at the lower limit position can be adjusted by changing the interval and the aperture parameters of the damping holes 35.

Claims (8)

1. Lower limit buffer structure of two-way cylinder shock absorber, its characterized in that includes: the limiting cylinder is arranged between the bottom cylinder and the inner cylinder of the shock absorber, the limiting cylinder and the limiting piston arranged at the end part of the piston rod form a relatively airtight cavity, a plurality of damping holes used for communicating the cavity with the bottom cylinder are further formed in the limiting piston, and the total sum of the diameters of the damping holes is reduced along with the gradual insertion of the limiting piston into the bottom cylinder, so that the damping force of the piston rod when the piston rod is close to the lower limit position is changed.

2. The lower limit buffering structure of the bidirectional tube type shock absorber as set forth in claim 1, wherein the limit piston has an extension portion extending toward the bottom cylinder, an extension through hole communicating with an end portion of the extension portion is provided at a center of the extension portion, a plurality of damping holes penetrating through a sidewall and connected with the extension through hole are further provided on the extension portion, the plurality of damping holes and the extension through hole form a flow path between the cavity and the bottom cylinder and are gradually closed as the limit piston is gradually inserted into the bottom cylinder.

3. The lower limit buffer structure of a bidirectional cylinder type shock absorber according to claim 1, wherein the inner diameter of the limit cylinder is smaller than the inner diameter of the inner cylinder, and an outer seal ring for sealing in contact with the inner wall of the inner cylinder is arranged on the outer periphery of the body of the limit piston, so that the cavity is formed.

4. A two-way tube shock absorber lower limit cushioning structure according to claim 2, further comprising a check valve structure disposed on the bottom wall of the limit cylinder, said check valve structure permitting fluid flow only from said bottom cylinder through the check valve structure into said cavity.

5. The lower limit buffer structure of a bidirectional cylinder type shock absorber as set forth in claim 4, wherein a retainer ring is provided on the bottom wall, and a flange portion of the retainer ring covers a plurality of oil return holes which are also provided on the bottom wall and are used for communicating the limit cylinder and the bottom cylinder in a unidirectional manner, so that liquid can only push the flange portion from the oil return hole side to enter the limit cylinder, thereby forming the check valve structure.

6. The lower limit buffering structure of the bidirectional cartridge type shock absorber of claim 5, further comprising: the pretension piece is arranged on the lower end face of the bottom wall and connected with the support frame fixed at the lower end of the retainer ring, so that pretension force is provided to enable the flanging part to be clung to the upper end face of the bottom wall.

7. The lower limit buffering structure of the bidirectional cartridge type shock absorber of claim 6, wherein an inner sealing member closely attached to the bottom wall is further arranged on one side of the pre-tightening member.

8. A lower limit buffering structure of a bidirectional tube type shock absorber according to any one of claims 1 to 7, wherein the periphery of the limit cylinder is provided with an oil storage groove through hole communicating the bottom cylinder and the outer cylinder.