Shock absorber with anti-foaming function

Abstract

The utility model relates to the technical field of automobile shock absorbers, in particular to a shock absorber with an anti-foaming function. An oil seal is arranged at the top of the guider assembly, the oil seal is fixed to the top of the shock absorber outer cylinder barrel through a turnup of the barrel wall, one side of the piston rod penetrates through the guider assembly and extends into the shock absorber inner cylinder barrel, the other side of the piston rod is arranged on the outer side of the shock absorber outer cylinder barrel, and the side, in the shock absorber inner cylinder barrel, of the piston rod is provided with an installation groove and a supporting ring. A springback pad is installed on the side, close to the guider assembly, of the supporting ring, a stepped hole is formed in the guider assembly, a lining is arranged at the bottom in the stepped hole, an oil seal base is arranged at the top in the stepped hole, oil discharging channels are evenly formed in a cavity in the lower side of the oil seal base, and the outer side of the lower end of the guider assembly is sleeved with an anti-foaming ring. Auxiliary oil channels are evenly formed in the lower end of the anti-foaming ring. Compared with the prior art, damping force output is stabilized, bubble breakage abnormal sound is eliminated, and the problems of performance attenuation and noise caused by oil cavitation are systematically solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile shock absorber, specifically to a shock absorber with anti bubble function. BACKGROUND

[0002] The shock absorber of new energy automobile suspension system is used frequently and recovers energy, and the annual working frequency reaches 2-3 times of traditional fuel vehicles, so that the cavitation of oil is intensified. Experiments show that when the gas content of oil exceeds 5%, the damping force fluctuation amplitude reaches ±15%, and the sound pressure level of wideband noise (500-2000Hz) generated by bubble rupture increases by more than 10dB, which seriously affects the vehicle control stability and NVH performance.

[0003] The current common defoaming technology method has obvious defects:

[0004] 1. The oil storage cavity expansion method: although increasing the oil storage space can reduce the cavitation rate in the short term, it increases the axial size of the shock absorber by 20%, and cannot solve the problem of real-time bubble generation under dynamic conditions;

[0005] 2. Defoaming agent addition method: chemical additives reduce the viscosity stability of oil, and the viscosity fluctuation reaches 40% at-30℃ low temperature environment, which affects the damping linearity;

[0006] It is urgent to solve the problems of inhibiting the bubbles generated by valve extrusion during the working process of the shock absorber, stabilizing the damping force output and eliminating the abnormal sound of bubble rupture. INVENTION CONTENTS

[0007] In order to solve the problems in the background art, the utility model provides a shock absorber with anti bubble function, which comprises a shock absorber inner cylinder, a shock absorber outer cylinder, a piston rod, a guide assembly, a support ring, a rebound pad, the outer side of the shock absorber inner cylinder is provided with the shock absorber outer cylinder, one end of the shock absorber inner cylinder is provided with the guide assembly, the top end of the shock absorber inner cylinder and the outer side of the guide assembly abut, the top of the guide assembly is provided with an oil seal, the top of the shock absorber outer cylinder is fixed with the oil seal through the turn-up of the cylinder wall, one side of the piston rod penetrates through the guide assembly and extends into the shock absorber inner cylinder, the other side is arranged outside the shock absorber outer cylinder, one side of the piston rod in the shock absorber inner cylinder is provided with a mounting groove and is installed with the support ring, the support ring is installed with the rebound pad near one side of the guide assembly, the guide assembly comprises a guide body, an anti bubble ring and a bushing, the inside of the guide body is provided with a stepped hole, the inside bottom of the stepped hole is provided with the bushing, the inside top of the stepped hole is provided with an oil seal seat, the lower side cavity of the oil seal seat is uniformly provided with an oil discharge channel, the lower end outside of the guide body is sleeved with the anti bubble ring, the lower end of the anti bubble ring is uniformly provided with an auxiliary oil channel, the cross section of the anti bubble ring is in the shape of a "n" character, the anti bubble ring is smoothly transitioned at the turning point, a cavity is formed between the anti bubble ring and the guide body, and the bottom of the anti bubble ring abuts against the top of the shock absorber inner cylinder.

[0008] The gap is arranged between the support ring and the inner cylinder of the damper, and the gap is arranged between the anti-foam ring and the outer cylinder of the damper.

[0009] The rebound pad is in interference fit with the piston rod.

[0010] The guide body is uniformly provided with inclined reinforcing ribs outside.

[0011] The bushing is provided with a lubricating coating outside.

[0012] Compared with the prior art, the utility model discloses a valve system motion process realizes real-time separation of bubbles, stable damping force output and elimination of bubble breakage abnormal sound through the asymmetric flow channel design and gas-liquid separation technology, and systematically solves the performance attenuation and noise problem caused by cavitation of oil liquid of the traditional damper. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a damper structure schematic view;

[0014] Figure 2 It is a guide assembly sectional view;

[0015] Figure 3 It is a guide assembly front view;

[0016] Figure 4 It is a guide assembly top view;

[0017] Figure 5 It is a guide assembly bottom view;

[0018] Figure 6 It is an anti-foam ring perspective view and sectional view;

[0019] Referring to Figure 1 , 1, the inner cylinder of the damper, 2, the outer cylinder of the damper, 3, the piston rod, 4, the guide assembly, 5, the support ring, 6, the rebound pad, 7, the oil seal, 8, the guide body, 9, the anti-foam ring, 10, the bushing, 11, the oil discharge channel, 12, the auxiliary oil channel, 13, the inclined reinforcing rib. DETAILED DESCRIPTION

[0020] The utility model will be further explained according to the drawings.

[0021] As Figure 1The application discloses a shock absorber with anti-foaming function, which comprises an inner cylinder 1, an outer cylinder 2, a piston rod 3, a guide assembly 4, a supporting ring 5 and a rebound pad 6, wherein the outer side of the inner cylinder 1 is provided with the outer cylinder 2, one end of the inner cylinder 1 is provided with the guide assembly 4, the top end of the inner cylinder 1 and the outer side of the guide assembly 4 are in abutment, the top of the guide assembly 4 is provided with an oil seal 7, the top of the outer cylinder 2 is fixed with the oil seal 7 through the flanging of the cylinder wall, the piston rod 3 penetrates through the guide assembly 4 and extends into the inner cylinder 1 on one side and is arranged on the outer side of the outer cylinder 2 on the other side, the piston rod 3 is provided with a mounting groove on one side in the inner cylinder 1 and is mounted with the supporting ring 5, the supporting ring 5 is mounted with the rebound pad 6 on the side close to the guide assembly 4, the guide assembly 4 comprises a guide body 8, an anti-foaming ring 9 and a bushing 10, the guide body 8 is internally provided with a stepped hole, the bushing 10 is arranged at the bottom of the stepped hole, an oil seal seat is arranged at the top of the stepped hole, the lower side cavity of the oil seal seat is uniformly provided with an oil discharge channel 11, the anti-foaming ring 9 is arranged on the outer side of the lower end of the guide body 8, the lower end of the anti-foaming ring 9 is uniformly provided with an auxiliary oil channel 12, the anti-foaming ring 9 is in a "N" shape in cross section, the anti-foaming ring 9 is smoothly transitioned at the turning position, a cavity is formed between the anti-foaming ring 9 and the guide body 8, and the bottom of the anti-foaming ring 9 is in abutment with the top of the inner cylinder 1.

[0022] A gap is arranged between the supporting ring 5 and the inner cylinder 1, and a gap is arranged between the anti-foaming ring 9 and the outer cylinder 2.

[0023] The rebound pad 6 is in interference fit with the piston rod 3, so that the rebound pad 6 is fixed on the piston rod 3.

[0024] The outer side of the guide body 8 is uniformly provided with inclined reinforcing ribs 13, so that the strength of the guide assembly 4 is improved.

[0025] The outer side of the bushing 10 is provided with a lubricating coating, so that the friction is reduced.

[0026] The inner part of the shock absorber is filled with shock absorber oil and air, when the shock absorber is at rest, the shock absorber oil is located at the lower part of the shock absorber, the air is located at the upper part of the shock absorber, and the oil and the air are separated. When the shock absorber moves, the oil flows in the inner cylinder 1 and the outer cylinder 2, at this time, the air is partially dissolved in the oil, and bubbles are generated. When the shock absorber is stretched, the oil in the inner cylinder 1 enters the outer cylinder 2 through the oil discharge channel. When the oil containing a large amount of bubbles passes through the gap between the anti-foaming ring 9 and the outer cylinder 2, the bubbles are filtered and remain in the cavity formed between the anti-foaming ring 9 and the guide assembly 4, so that the bubbles do not flow out of the valve system at the bottom of the shock absorber, thereby avoiding the adverse effects on the damping force value of the shock absorber and the noise caused by the concentrated rupture.

[0027] Under the continuous compression-rebound working condition, the peak value of oil flow rate of automobile shock absorber reaches 18 m / s, the instantaneous pressure difference of valve system exceeds 2 MPa, which causes the dissolved gas to precipitate to form bubble groups with a diameter of 50-200 μm. These bubbles break when flowing through the throttle valve, not only causing the nonlinear jump of damping force (the fluctuation amplitude reaches ±18%), but also generating 68 dB pulse noise in the frequency band of 800-1500 Hz. The utility model adopts the anti-bubble ring structure of the guider, realizes the real-time separation of bubbles in the movement process of the valve system through the asymmetric flow channel design and gas-liquid separation technology. The utility model can compress the fluctuation amplitude of damping force to ±3%, and reduce the bubble breaking noise by 12 dB.

Claims

1. A shock absorber with anti-bubble function, comprising a shock absorber inner cylinder (1), a shock absorber outer cylinder (2), a piston rod (3), a guider assembly (4), a support ring (5), a rebound pad (6), characterized in that: The inner cylinder (1) of the shock absorber is provided with an outer cylinder (2) of the shock absorber, one end of the inner cylinder (1) is provided with a guide assembly (4), the top end of the inner cylinder (1) abuts the outer side of the guide assembly (4), the top of the guide assembly (4) is provided with an oil seal (7), the top of the outer cylinder (2) of the shock absorber is fixed with the oil seal (7) through the flanging of the cylinder wall, one side of the piston rod (3) penetrates the guide assembly (4) and extends into the inner cylinder (1) of the shock absorber, the other side is arranged outside the outer cylinder (2) of the shock absorber, the piston rod (3) is provided with a mounting groove and a support ring (5) on one side in the inner cylinder (1) of the shock absorber, the rebound pad (6) is arranged on the side close to the guide assembly (4) of the support ring (5), the guide assembly (4) comprises a guide body (8), an anti-foaming ring (9) and a bushing (10), the guide body (8) is provided with a stepped hole inside, the bushing (10) is arranged at the bottom of the stepped hole, the oil seal seat is arranged at the top of the stepped hole, the oil discharge channel (11) is uniformly arranged in the lower side cavity of the oil seal seat, the anti-foaming ring (9) is arranged outside the lower end of the guide body (8), the auxiliary oil channel (12) is uniformly arranged at the lower end of the anti-foaming ring (9), the cross section of the anti-foaming ring (9) is in the shape of "N", the transition at the turning point of the anti-foaming ring (9) is smooth, the cavity is formed between the anti-foaming ring (9) and the guide body (8), and the bottom of the anti-foaming ring (9) abuts the top of the inner cylinder (1) of the shock absorber.

2. A shock absorber with anti-bubble function according to claim 1, characterized in that: The gap is arranged between the support ring (5) and the inner cylinder (1) of the shock absorber, and the gap is arranged between the anti-foaming ring (9) and the outer cylinder (2) of the shock absorber.

3. A shock absorber with anti-bubble function according to claim 1, characterized in that: The rebound pad (6) is in interference fit with the piston rod (3).

4. The shock absorber with anti-bubble function according to claim 1, characterized in that: The inclined reinforcing ribs (13) are uniformly arranged outside the guide body (8).

5. The shock absorber with anti-bubble function according to claim 1, wherein: The bushing (10) is provided with a lubricating coating outside.

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