External CDC electromagnetic valve type variable damping force shock absorber

Abstract

The utility model discloses an external CDC electromagnetic valve type variable damping force shock absorber which comprises a liquid storage cylinder. A working cylinder is arranged inside the liquid storage barrel, an electromagnetic valve and a pressure cylinder assembly are arranged outside the liquid storage barrel, an oil seal guider is arranged at the upper end of the liquid storage barrel, and the lower end is sealed through a bottom cover; a piston rod is arranged in the working cylinder, and a bottom valve is arranged at the bottom; a piston damping valve is arranged at the lower end of the piston rod, an oil cavity A is formed between the piston damping valve and the oil seal guider, and an oil cavity B is formed between the piston damping valve and the bottom valve; an oil chamber C is formed between the bottom valve and the bottom cover; an oil chamber D and an oil chamber E are formed between the liquid storage barrel and the working cylinder; a through hole A communicated with the oil chamber A and the oil chamber D is formed in the upper part of the working cylinder; the electromagnetic valve is provided with two B through holes which are respectively communicated with the D oil chamber and the E oil chamber; a through hole C communicated with the oil chamber C is formed in the pressure cylinder assembly; the bottom valve is provided with a D through hole communicated with the B oil cavity and the C oil cavity and a notch communicated with the E oil cavity and the B oil cavity.

Description

Technical Field

[0001] The utility model relates to the technical field of shock absorbers, in particular to an external CDC solenoid valve type variable damping force shock absorber. Background Art

[0002] Shock absorbers are a kind of equipment used to accelerate the attenuation of frame and body vibrations and improve the smoothness (comfort) of car driving. Shock absorbers are installed in the suspension system of most cars. Due to different requirements for car comfort from different car owners, the same car model is often divided into high-end and low-end models; among them, low-end cars usually use ordinary shock absorbers (that is, the damping force is fixed and cannot be changed according to road conditions), and the maintenance cost is low; while high-end cars usually use variable damping force shock absorbers to improve the comfort of vehicle driving. Due to the different structures of shock absorbers used in high-end and low-end cars, the chassis structure of the car is also very different. High-end cars often need to redesign specific chassis structures, thereby increasing the development cost of the car. In addition, with the continuous improvement of the requirements for car comfort, those who buy low-end cars often choose to convert the shock absorbers into variable damping force shock absorbers. However, due to the large differences in the chassis structure of the car, the modification cost is very high, and some cars cannot even be modified. Utility Model Content

[0003] The present application provides an external CDC solenoid valve type variable damping force shock absorber to overcome the above-mentioned problems existing in the prior art. The variable damping force shock absorber of the present application is provided with a working cylinder inside a liquid storage cylinder and a solenoid valve outside. The solenoid valve is used to control the amount of oil passing through the liquid storage cylinder and the working cylinder to achieve the adjustment of the damping force of the shock absorber. The damping effect is good, and the shock absorber is improved to adapt to the needs of complex road surfaces; and the shock absorber adopts a structural design in which the booster cylinder assembly is separated from the liquid storage cylinder, which increases the stroke of the shock absorber and makes it applicable to some special working conditions; in addition, the shock absorber of the present application has a specific shape structure, so that in the production and manufacturing of automobiles, the versatility of the chassis parts of high- and low-end models of the same automobile can be improved, that is, the high-end model does not need to redesign the chassis, only needs to make some small changes to the original chassis structure, and the variable damping force shock absorber of the present application can be installed, which greatly reduces the development cost of the automobile chassis; and when the subsequent low-end model needs to upgrade the shock absorber, the required modification cost is low.

[0004] The technical solution of this application is:

[0005] An external CDC solenoid valve type variable damping force shock absorber comprises a liquid storage cylinder; a working cylinder is arranged inside the liquid storage cylinder, and a solenoid valve and a booster cylinder assembly are arranged outside the liquid storage cylinder; a piston rod which can slide relative to the working cylinder is arranged inside the working cylinder, and a bottom valve is arranged at the bottom; a piston damping valve is arranged at the lower end of the piston rod, and the upper end extends from the top of the liquid storage cylinder; an oil seal guide is arranged at the upper end of the liquid storage cylinder, and the lower end is sealed by a bottom cover; an oil chamber A is formed between the piston damping valve and the oil seal guide, and an oil chamber B is formed between the piston damping valve and the bottom valve; An oil chamber C is formed between the bottom valve and the bottom cover; a cavity is formed between the liquid storage cylinder and the working cylinder, and is divided into an oil chamber D and an oil chamber E by a sealing ring assembly; an A through hole connecting the oil chamber A and the oil chamber D is provided on the upper part of the working cylinder; two B through holes respectively connected to the oil chamber D and the oil chamber E are provided on the solenoid valve; a C through hole connected to the oil chamber C is provided on the booster cylinder assembly; a D through hole connecting the oil chamber B and the oil chamber C, and a notch connecting the oil chamber E and the oil chamber B are provided on the bottom valve.

[0006] Compared with the prior art, the external CDC solenoid valve type variable damping force shock absorber of the present application achieves adjustment of the damping force of the shock absorber by arranging a working cylinder inside the liquid storage cylinder and an electromagnetic valve outside, and using the electromagnetic valve to control the amount of oil passing through the liquid storage cylinder and the working cylinder, so as to have a good vibration reduction effect and can adapt to the needs of complex roads; and the shock absorber adopts a structural design in which the booster cylinder assembly is separated from the liquid storage cylinder, so that the stroke of the shock absorber is large, so that it can be applied to some special working conditions; in addition, the shock absorber of the present application has a specific appearance structure, so that in the production and manufacturing of automobiles, the versatility of the chassis parts of high-end and low-end models of the same automobile can be improved, that is, the high-end model does not need to redesign the chassis, only needs to make some minor changes to the original chassis structure, and the variable damping force shock absorber of the present application can be installed, which greatly reduces the development cost of the automobile chassis; and when the shock absorber of the subsequent low-end model is to be upgraded, the modification cost required is relatively low.

[0007] As an optimization, in the aforementioned external CDC solenoid valve variable damping force shock absorber, the solenoid valve is connected to the liquid storage cylinder through the A connection block, and the booster cylinder assembly is connected to the liquid storage cylinder through the B connection block; the A connection block is provided with two A liquid flow channels, which are respectively connected to the two B through holes, and the B connection block is provided with a B liquid flow channel connected to the C through hole. Therefore, the solenoid valve and the booster cylinder assembly can be designed to avoid air through the connection block, avoiding the position that interferes with the installation, and reasonably allocating the space in the vehicle, making installation easier.

[0008] Furthermore, the angle α between the axis of the A connecting block and the axis of the B connecting block is 140° to 145°.

[0009] As an optimization, in the aforementioned external CDC solenoid valve variable damping force shock absorber, the booster cylinder assembly includes a booster cylinder, and end covers and a base arranged at both ends of the booster cylinder; a floating piston is arranged inside the booster cylinder, dividing the inside of the booster cylinder into an F oil chamber and an air chamber. At this time, the floating piston has a larger stroke, thereby increasing the stroke of the shock absorber.

[0010] Furthermore, a guide belt is provided between the outer circumference of the floating piston and the inner wall of the booster cylinder. Thus, the floating piston can be prevented from deflecting during movement and rubbing against the inner wall of the booster cylinder, thereby improving the sealing effect between the floating piston and the booster cylinder. Furthermore, a protrusion is provided at each end of the guide belt, and the two protrusions are located at both sides of the guide belt. When the guide belt is installed, it is wound around the floating piston; its specific structural design can ensure that the entire circumference of the floating piston can be wrapped by the guide belt, thereby facilitating a better support effect.

[0011] Furthermore, a gas filling hole is provided in the middle of the end cover, and a gas filling rivet is inserted into the gas filling hole; the gas filling rivet and the end cover are connected by projection welding. In this case, gas filling is more convenient, and the connection strength and sealing performance between the gas filling rivet and the lower end cover can also be ensured.

[0012] As an optimization, in the aforementioned external CDC solenoid valve type variable damping force shock absorber, a retaining ring is sleeved on the outer side of the lower end of the liquid storage cylinder. The shock absorber is installed on the car through the retaining ring, which is convenient to install and easy to implement.

[0013] As an optimization, in the aforementioned external CDC solenoid valve type variable damping force shock absorber, the oil seal guide is provided with an E through hole connecting the A oil chamber and the inside of the oil seal guide. At this time, the sealing performance of the oil seal guide can be enhanced by the pressure generated by the oil flowing into the inside of the oil seal guide from the E through hole, thereby improving the compactness of the structure and making the implementation easier.

[0014] As an optimization, in the aforementioned external CDC solenoid valve variable damping force shock absorber, a limit block is sleeved on the piston rod, and a buffer block is provided above the limit block. The limit block is used to limit the stroke of the piston rod; the buffer block is used to protect the oil seal guide during the movement of the piston rod to prevent it from being damaged by the impact of the limit block. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of a common shock absorber used in a low-end model in the prior art;

[0016] Figure 2 It is a structural schematic diagram of the external CDC solenoid valve type variable damping force shock absorber of the present application;

[0017] Figure 3 yes Figure 2 AA section view of the shock absorber;

[0018] Figure 4 It is a schematic diagram of the structure of the liquid storage cylinder in this application;

[0019] Figure 5 yes Figure 4 An enlarged schematic diagram of part B in FIG.

[0020] Figure 6 is a schematic structural diagram of a booster cylinder assembly in an embodiment of the present application;

[0021] Figure 7 is a schematic diagram of the structure of the guide belt in the embodiment of the present application;

[0022] Figure 8 is a schematic diagram of the structure of the A connection block in the embodiment of the present application;

[0023] Fig. 9 It is a structural diagram of the B connection block in the embodiment of the present application.

[0024] The markings in the attached drawings are: 1-liquid storage cylinder, 101-A oil chamber, 102-B oil chamber, 103-C oil chamber, 104-D oil chamber, 105-E oil chamber; 2-working cylinder, 201-A through hole; 3-solenoid valve; 4-boosting cylinder assembly, 41-boosting cylinder, 42-end cover, 43-base, 44-floating piston, 45-guide belt, 451-protrusion, 46-inflatable rivet, 401- C through hole, 402-F oil chamber, 403-air chamber; 5-piston rod; 6-bottom valve, 601-D through hole, 602-notch; 7-piston damping valve; 8-oil seal guide, 801-E through hole; 9-bottom cover; 10-sealing ring assembly; 11-A connecting block, 111-A liquid flow channel; 12-B connecting block, 121-B liquid flow channel; 13-retaining ring; 14-limiting block; 15-buffer block. DETAILED DESCRIPTION

[0025] The present application is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present application.

[0026] In the prior art, for the same model, the low-end version usually uses ordinary shock absorbers (see Figure 1), the high-end version usually uses variable damping force vibration reduction, which makes the chassis structure of the two versions of the car very different. In the process of automobile production, the high-end version often needs to redesign the chassis structure, which has high development costs, and the subsequent low-end version of the car needs to upgrade the shock absorber, and the required modification cost is also very high. In view of this, the present application provides an external CDC solenoid valve type variable damping force shock absorber. When upgrading the shock absorber for the low-end version of the car, only some minor changes need to be made to the chassis, which will not affect the original installation and loading size, and the modification cost is low.

[0027] Example (see Figure 2 to Figure 9 ):

[0028] The external CDC solenoid valve variable damping force shock absorber of this embodiment includes a liquid storage cylinder 1; a working cylinder 2 is provided inside the liquid storage cylinder 1, and a solenoid valve 3 (normally open or normally closed can be selected as needed) and a booster cylinder assembly 4 are provided outside; a piston rod 5 that can slide relative to the working cylinder 2 is provided inside, and a bottom valve 6 is provided at the bottom; a piston damping valve 7 is provided at the lower end of the piston rod 5, and the upper end extends from the top of the liquid storage cylinder 1; an oil seal guide 8 is provided at the upper end of the liquid storage cylinder 1, and the lower end is sealed by a bottom cover 9; a retaining ring 13 is sleeved on the outer side of the lower end of the liquid storage cylinder 1; an A oil chamber 101 is formed between the piston damping valve 7 and the oil seal guide 8, and a B oil chamber 102 is formed between the piston damping valve 7 and the bottom valve 6 ; A C oil chamber 103 is formed between the bottom valve 6 and the bottom cover 9; a cavity is formed between the liquid storage barrel 1 and the working cylinder 2, and is divided into a D oil chamber 104 and an E oil chamber 105 by the sealing ring assembly 10; an A through hole 201 is provided on the upper part of the working cylinder 2 for connecting the A oil chamber 101 and the D oil chamber 104; two B through holes are provided on the solenoid valve 3 for connecting with the D oil chamber 104 and the E oil chamber 105 respectively; a C through hole 401 connected with the C oil chamber 103 is provided on the booster cylinder assembly 4; a D through hole 601 connecting the B oil chamber 102 and the C oil chamber 103, and a notch 602 connecting the E oil chamber 105 and the B oil chamber 102 are provided on the bottom valve 6.

[0029] In this embodiment, the solenoid valve 3 is connected to the liquid storage cylinder 1 through the A connecting block 11, and the booster cylinder assembly 4 is connected to the liquid storage cylinder 1 through the B connecting block 12; the A connecting block 11 is provided with two A liquid flow channels 111, which are respectively connected to the two B through holes, and the B connecting block 12 is provided with a B liquid flow channel 121 connected to the C through hole 401; the angle α between the axis of the A connecting block 11 and the axis of the B connecting block 12 is 143°.

[0030] See also Figure 6In this embodiment, the booster cylinder assembly 4 includes a booster cylinder 41, and end covers 42 and a base 43 provided at both ends of the booster cylinder 41; a floating piston 44 is provided inside the booster cylinder 41, and the inside of the booster cylinder 41 is divided into an oil chamber 402 and an air chamber 403. The air chamber 403 is filled with high-pressure nitrogen (2.0MPa) to provide a stable pressure for the internal working space of the shock absorber and improve the safety of use.

[0031] Furthermore, a guide belt 45 (made of polytetrafluoroethylene) is provided between the outer circumference of the floating piston 44 and the inner wall of the booster cylinder 41 to prevent the floating piston 44 from deflecting during movement and rubbing against the inner wall of the booster cylinder 41, thereby improving the sealing effect between the floating piston 44 and the booster cylinder 41. Furthermore, a protrusion 451 is provided at each end of the guide belt 45, and the two protrusions 451 are respectively located at the two sides of the guide belt 45 (such as Figure 7 As shown), to ensure that the entire circumference of the floating piston 44 can be wrapped by the guide belt 45, providing a better support effect.

[0032] Furthermore, an air filling hole is opened in the middle of the end cover 42, and an air filling rivet 46 is inserted into the air filling hole; the air filling rivet 46 and the end cover 42 are connected by projection welding.

[0033] In this embodiment, the oil seal guide 8 is provided with an E through hole 801 connecting the A oil chamber 101 and the inside of the oil seal guide 8. At this time, the pressure generated by the oil flowing into the oil seal guide 8 from the E through hole 801 can enhance the sealing performance of the oil seal guide 8 and improve the compactness of the structure.

[0034] In this embodiment, a limit block 14 is provided on the piston rod 5 to limit the stroke of the piston rod 5; a buffer block 15 is provided above the limit block 14 to protect the oil seal guide 8 during the movement of the piston rod 5 to prevent it from being damaged by the impact of the limit block.

[0035] After the solenoid valve 3 is opened, when the compression rod 5 moves downward, part of the oil in the B oil chamber 102 flows into the C oil chamber 103 from the bottom valve 6, and flows into the F oil chamber 402 through the B liquid flow channel 121, compressing the gas in the gas chamber 403; part of the oil in the A oil chamber 101 enters the D oil chamber 104 from the A through hole 201, and flows into the solenoid valve 3 from one of the B through holes, and then flows out from the other B through hole to the E oil chamber 105, and then enters the B oil chamber 102 from the notch 602 on the bottom valve 6; at this time, the damping force of the shock absorber is relatively small.

[0036] The above general description of the utility model involved in this application and the description of its specific implementation method should not be understood as limiting the technical solution of the utility model. Based on the disclosure of this application, those skilled in the art can add, reduce or combine the disclosed technical features in the above general description or / and the specific implementation method (including examples) without violating the constituent elements of the utility model involved, to form other technical solutions within the scope of protection of this application.

Claims

1. External CDC solenoid valve variable damping force shock absorber, characterized by: The invention comprises a liquid storage cylinder (1); a working cylinder (2) is arranged inside the liquid storage cylinder (1), and a solenoid valve (3) and a booster cylinder assembly (4) are arranged outside the liquid storage cylinder (1); a piston rod (5) which can slide relative to the working cylinder (2) is arranged inside the working cylinder (2), and a bottom valve (6) is arranged at the bottom; a piston damping valve (7) is arranged at the lower end of the piston rod (5), and the upper end protrudes from the top of the liquid storage cylinder (1); an oil seal guide (8) is arranged at the upper end of the liquid storage cylinder (1), and the lower end is sealed by a bottom cover (9); an oil chamber A (101) is formed between the piston damping valve (7) and the oil seal guide (8), and an oil chamber B (102) is formed between the piston damping valve (7) and the bottom valve (6); an oil chamber C (103) is formed between the bottom valve (6) and the bottom cover (9); the liquid storage cylinder ( 1) and the working cylinder (2) form a cavity, which is divided into a D oil chamber (104) and an E oil chamber (105) by a sealing ring assembly (10); the upper part of the working cylinder (2) is provided with an A through hole (201) communicating with the A oil chamber (101) and the D oil chamber (104); the solenoid valve (3) is provided with two B through holes respectively communicating with the D oil chamber (104) and the E oil chamber (105); the booster cylinder assembly (4) is provided with a C through hole (401) communicating with the C oil chamber (103); the bottom valve (6) is provided with a D through hole (601) communicating with the B oil chamber (102) and the C oil chamber (103), and a notch (602) communicating with the E oil chamber (105) and the B oil chamber (102).

2. The external CDC solenoid valve variable damping force shock absorber according to claim 1, characterized in that: The solenoid valve (3) is connected to the liquid storage cylinder (1) via an A connection block (11), and the booster cylinder assembly (4) is connected to the liquid storage cylinder (1) via a B connection block (12); the A connection block (11) is provided with two A liquid flow channels (111) which are respectively connected to two B through holes, and the B connection block (12) is provided with a B liquid flow channel (121) which is connected to a C through hole (401).

3. The external CDC solenoid valve variable damping force shock absorber according to claim 2, characterized in that: The angle α between the axis of the A connecting block (11) and the axis of the B connecting block (12) is 140° to 145°.

4. The external CDC solenoid valve type variable damping force shock absorber according to claim 2, characterized in that: The boosting cylinder assembly (4) comprises a boosting cylinder (41), and end covers (42) and a base (43) arranged at both ends of the boosting cylinder (41); a floating piston (44) is arranged inside the boosting cylinder (41) to divide the inside of the boosting cylinder (41) into an oil chamber (402) and an air chamber (403).

5. The external CDC solenoid valve variable damping force shock absorber according to claim 4, characterized in that: A guide belt (45) is provided between the outer peripheral surface of the floating piston (44) and the inner wall of the boosting cylinder (41).

6. The external CDC solenoid valve variable damping force shock absorber according to claim 5, characterized in that: A protrusion (451) is respectively provided at both ends of the guide belt (45), and the two protrusions (451) are respectively located at two sides of the guide belt (45).

7. The external CDC solenoid valve type variable damping force shock absorber according to claim 4, characterized in that: An air filling hole is provided in the middle of the end cover (42), and an air filling rivet (46) is inserted into the air filling hole; the air filling rivet (46) and the end cover (42) are connected by projection welding.

8. The external CDC solenoid valve type variable damping force shock absorber according to claim 1, characterized in that: A retaining ring (13) is sleeved on the outer side of the lower end of the liquid storage cylinder (1).

9. The external CDC solenoid valve type variable damping force shock absorber according to claim 1, characterized in that: The oil seal guide (8) is provided with an E through hole (801) communicating with the A oil chamber (101) and the interior of the oil seal guide (8).

10. The external CDC solenoid valve variable damping force shock absorber according to claim 1, characterized in that: A limit block (14) is sleeved on the piston rod (5), and a buffer block (15) is arranged above the limit block (14).

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