CN208057798U - A kind of vehicle shock absorber hydraulic buffering mechanism - Google Patents

Abstract

The utility model discloses a hydraulic buffer mechanism for an automobile shock absorber; it includes a guide sleeve, a limit seat, a retaining ring, a retaining spring and a piston rod; the sleeve includes a trumpet-shaped bevel, a long groove, and a short groove; Convex curved surface, upper notch, axial groove, lower notch; as the shock absorber is stretched to the maximum length position, the limit seat enters the sleeve, and the convex surface of the limit seat and the trumpet-shaped groove of the sleeve, The long groove and short groove cooperate with throttling; a relatively closed oil chamber is formed inside the sleeve, and the convex curved surface of the limit seat cooperates with the trumpet-shaped bevel, long groove and short groove of the sleeve to increase the throttling area smoothly. The utility model eliminates impact feeling, avoids noise, and restrains vehicle roll. Compared with the existing buffer structure, the hydraulic buffer can produce a small buffer force when the suspension moves at a low speed to ensure comfort, and at the same time, it can provide a good suspension when the suspension moves quickly under bad road conditions or the body rolls quickly under intense driving. Large hydraulic buffer force avoids tensile impact and improves handling performance, while avoiding the height loss of the existing buffer structure after repeated compression.

Description

Hydraulic buffer mechanism for automobile shock absorber

technical field

The utility model belongs to the technical field of vehicle suspension and relates to a hydraulic buffer mechanism of an automobile shock absorber.

Background technique

During the working process of the hydraulic shock absorber of the automobile suspension system, the piston rod reciprocates in the working cylinder, and the oil passes through the valve system to generate damping force.

In the case of large bumpy road conditions, it is hoped that the damping of the shock absorber will be increased, so that the shock absorber can effectively absorb mechanical energy, avoid rigid impact, and achieve the effect of vibration reduction. Bring the most comfortable driving experience to drivers and passengers.

According to the needs of the suspension stroke, a retaining ring will be installed on the corresponding position of the piston rod of the shock absorber to limit the maximum stretching length of the shock absorber; in order to avoid damage and abnormal noise during the contact between the retaining ring and the guide seat, A non-metallic buffer washer is placed on the ring, which avoids direct contact between the retaining ring and the guide seat, reduces impact noise and plays a very limited buffering role.

In order to obtain an ideal buffering effect and suppress body roll, it is hoped that a large peak buffering force will be generated before the stretching stroke of the automobile suspension system reaches the stretching limit position. Usually, a recovery spring is placed on the retaining ring. When the shock absorber is stretched to a certain position, the spring is compressed to generate a rebound force, and together with the damping force generated by the valve system, it produces a resistance that inhibits the suspension from continuing to stretch; this structure is generally in the spring Plastic buffer washers are installed between the retaining ring and the guide seat, but when the spring is compressed to the parallel circle, noise and obvious impact will still be produced. There is also a structure that places a plastic spring on the retaining ring; the plastic spring has a larger deformability, which has a better buffering effect, can suppress the roll, and avoid the noise and impact of the metal spring when the ring is combined; it is affected by the material performance Due to the limitations of the plastic spring, the height loss is serious during the use of the plastic spring, resulting in a significant change in the maximum length of the shock absorber, which has a negative impact on the vehicle.

Contents of the invention

The utility model discloses a hydraulic buffer mechanism for an automobile shock absorber, which is used to solve the problem of noise and shock caused by placing a restoring spring on a retaining ring in the prior art, serious height loss of the plastic spring during use, and obvious changes in the maximum length of the shock absorber. , causing adverse effects on the vehicle and other issues.

The utility model includes a guide seat assembly, a working cylinder, an oil storage cylinder, a sleeve, a limit seat, a retaining ring, a retaining spring, a buffer washer, and a piston rod; the limit seat includes a circumferentially evenly distributed convex curved surface, a stepped surface, and an upper notch , axial groove, lower notch; the sleeve is fastened on the guide seat assembly; the working cylinder is fastened to the sleeve; the retaining ring is fastened on the piston rod; the limit seat is located above the retaining ring, Slidingly matched with the piston rod, floating installed between the retaining ring and the retaining ring; the retaining spring is tightly installed in the piston rod slot on the upper part of the retaining ring; during the stretching process of the piston rod, the volume of the oil chamber is compressed, and the oil pressure Increase; the oil pressure makes the limit seat and the retaining ring fit together, and the oil flows out along the upper notch, the axial groove, and the lower notch of the limit seat; the oil flows out from the gap between the sleeve and the limit seat, Generate hydraulic resistance that prevents the piston rod from continuing to stretch, and realize the hydraulic buffer function; when the piston rod compresses and moves, the oil returns to push the limit seat to contact the upper circlip, and the oil flows along the lower notch, axial groove, stepped surface, Upper notch for smooth return flow.

The floating gap between the retaining ring and the retaining ring of the limit seat of the utility model is 0.5mm-2mm.

The utility model can adjust the size of the hydraulic buffer force by changing the convex curved surface, the step surface, the upper notch, the axial groove and the lower notch area of the limit seat, that is, the peak value of the restoring damping force can be changed.

The sleeve of the utility model includes trumpet-shaped bevels, long grooves and short grooves uniformly distributed in the circumferential direction; as the shock absorber is stretched to the maximum position, the limit seat enters the sleeve, and the convex curved surface uniformly distributed in the circumferential direction of the limit seat and the sleeve The trumpet-shaped bevel, long groove, and short groove cooperate with throttling; a relatively closed oil chamber is formed inside the sleeve, and the convex surface of the limit seat cooperates with the horn-shaped groove, long groove, and short groove of the sleeve to make the throttling The smooth increase of the area can realize a small resistance in the initial stage of the hydraulic buffer, eliminate the sudden increase of the hydraulic buffer resistance, make the hydraulic buffer force softer, and improve the driving comfort.

The utility model changes the growth rate of the damping force at the initial stage of buffering by changing the area of the trumpet-shaped bevel, long groove, and short groove of the sleeve, and changing the area and shape of the convex surface uniformly distributed in the circumferential direction of the limit seat, thereby further improving the comfort of hydraulic buffering .

The utility model realizes the change of the size of the hydraulic buffer force and the starting position by changing the axial length of the sleeve, and meets the needs of different suspension strokes. When the shock absorber is close to the tensile limit position, the generated hydraulic buffer force increases with the speed of the piston rod, which can produce strong, continuous and smooth resistance.

The positive effects of the utility model are: eliminating impact feeling, avoiding noise, and restraining vehicle roll. Compared with the existing buffer structure, the hydraulic buffer can produce a small buffer force when the suspension moves at a low speed, ensuring comfort, and at the same time, it can provide a strong suspension when the suspension moves quickly under bad road conditions or the body rolls quickly under intense driving. Large hydraulic buffer force avoids tensile shock and improves handling performance, while avoiding the height loss of the existing buffer structure after repeated compression.

Description of drawings

Fig. 1 is a schematic diagram in the utility model structure piston rod stretching process;

Fig. 2 is a schematic view showing that the structural shock absorber of the present invention is stretched to a position close to the maximum;

Fig. 3 is a schematic diagram of the axial side of the sleeve of the utility model;

Fig. 4 is a schematic diagram of the utility model limit seat looking up at the axis side;

Fig. 5 is a schematic diagram of the utility model's position-limiting seat looking down on the axial side;

Fig. 6 is the utility model performance curve schematic diagram;

In the figure: 1 guide seat assembly, 2 working cylinder, 3 oil storage cylinder, 4 sleeve, 4a trumpet-shaped bevel, 4b long groove, 4c short groove, 5 limit seat, 5a convex curved surface, 5b stepped surface, 5c upper Notch, 5d axial groove, 5e lower notch, 6 retaining ring, 7 circlip, 8 buffer washer, 9 piston rod.

Detailed ways

An embodiment of the utility model will be described in detail below in conjunction with the accompanying drawings.

The utility model embodiment is shown in Figure 1 and Figure 2, including guide seat assembly 1, working cylinder 2, oil storage cylinder 3, sleeve 4, limit seat 5, retaining ring 6, retaining spring 7, buffer washer 8, piston pole 9.

As shown in Fig. 1, Fig. 2 and Fig. 3, the sleeve 4 includes trumpet-shaped bevels 4a, long grooves 4b, and short grooves 4c uniformly distributed in the circumferential direction.

As shown in Fig. 1, Fig. 2, Fig. 4 and Fig. 5, the limit seat 5 includes a convex curved surface 5a uniformly distributed in the circumferential direction, a stepped surface 5b, an upper notch 5c, an axial groove 5d, and a lower notch 5e.

As shown in Figure 1, Figure 2, Figure 3, Figure 4, and Figure 5, the sleeve 4 is tightly installed on the guide seat assembly 1; the working cylinder 2 is tightly installed and connected with the sleeve 4; the retaining ring 6 is tightly installed On the piston rod 9; the limit seat 5 is located above the retaining ring 6, slidingly fitted with the piston rod 9, and is floatingly installed between the retaining ring 7 and the retaining ring 6; the retaining spring 7 is fastened to the piston mounted on the upper part of the retaining ring 6 The rod 9 is stuck in the groove; the floating gap between the limit seat 5 between the circlip 7 and the retaining ring 6 is 0.5mm-2mm; during the stretching process of the piston rod, the volume of the oil chamber is compressed, and the oil pressure rises; The hydraulic pressure makes the limit seat 5 and the retaining ring 6 stick together, and the oil flows out along the upper notch 5c, the axial groove 5d, and the lower notch 5e of the limit seat 5. By changing the convex surface 5a and the step of the limit seat 5 The area of the surface 5b, the upper notch 5c, the axial groove 5d, and the lower notch 5e can adjust the size of the hydraulic buffer force, that is, change the peak value of the restoring damping force in the schematic diagram of the performance curve in Figure 5; the oil from the sleeve 4 and the limit seat The gap between 5 flows out to produce hydraulic resistance that hinders the piston rod from continuing to stretch, and realizes the hydraulic buffer function. When the piston rod compresses and moves, the backflow of the oil pushes the limit seat 5 to contact the upper retainer 7, and the oil flows back smoothly along the lower notch 5e, the axial groove 5d, the stepped surface 5b, and the upper notch 5c.

As the shock absorber stretches to the maximum position, the limit seat 5 enters the sleeve 4, and the circumferentially uniform convex curved surface 5a of the limit seat 5 cooperates with the trumpet-shaped bevel 4a, the long groove 4b, and the short groove 4c of the sleeve 4 Throttling: a relatively closed oil cavity is formed inside the sleeve 4, and the structure of the convex curved surface 5a of the limit seat 5 and the trumpet-shaped groove 4a, long groove 4b, and short groove 4c of the sleeve 4 cooperates to increase the throttle area smoothly, realizing In the early stage of hydraulic buffering, a small resistance is generated, eliminating the sudden increase of hydraulic buffering resistance, making the hydraulic buffering force softer and improving driving comfort. Changing the area of the trumpet-shaped bevel 4a, long groove 4b, and short groove 4c of the sleeve 4, and changing the area and shape of the convex surface 5a of the limit seat 5 can change the growth rate of the damping force at the initial stage of buffering, and further improve hydraulic buffering Comfort; change the axial length of the sleeve 4 to realize the change of the size of the hydraulic buffer force and the starting position to meet the needs of different suspension strokes. When the shock absorber is close to the tensile limit position, the generated hydraulic buffer force increases with the increase of the piston rod movement speed, resulting in strong, continuous and smooth resistance.

Claims (6)

1. a kind of vehicle shock absorber hydraulic buffering mechanism, including guide holder assembly, working cylinder, oil storage cylinder, sleeve, limit base, gear Circle, clamp spring, buffer gasket, piston rod；It is characterized in that：Limit base include circumferentially uniformly distributed convex surface, cascaded surface, upper notch, Axial groove, lower notch；Sleeve is securedly mounted on guide holder assembly；Working cylinder and sleeve fastening installation connection；Baffle ring fastening peace Dress is on the piston rod；Limit base is located above baffle ring, is slidably matched with piston rod, floating mount is between clamp spring and baffle ring； Clamp spring is securedly mounted in the piston rod card slot on baffle ring top；In piston rod drawing process, oil chamber volume is compressed, fluid pressure Power increases；Oil liquid pressure makes limit base and baffle ring be bonded, and fluid is flowed out along the upper notch, axial groove, lower notch of limit base；Fluid Gap is flowed out between sleeve and limit base, generates and piston rod is hindered to continue the flowed friction stretched, realizes hydraulic cushion function； When piston rod compression movement, fluid reflux pushes limit base to be contacted with top clamp spring, and fluid is along lower notch, axial groove, ladder Face, the smooth reflux of upper notch.

2. a kind of vehicle shock absorber hydraulic buffering mechanism according to claim 1, it is characterised in that：Limit base clamp spring with Flying height between baffle ring is 0.5mm-2mm.

3. a kind of vehicle shock absorber hydraulic buffering mechanism according to claim 1, it is characterised in that：By changing limit base Convex surface, cascaded surface, upper notch, axial groove, lower notch area, adjust hydraulic cushion power size.

4. a kind of vehicle shock absorber hydraulic buffering mechanism according to claim 1, it is characterised in that：Sleeve includes circumferential equal Horn-like groove, elongated slot, the short slot of cloth；As damper is stretched to close to maximum position, limit base enters sleeve, limit base The horn-like groove of convex surface and sleeve, elongated slot, the cooperation throttling of short slot；Relative closure oil pocket, limit base are formed in sleeve inner Convex surface and the horn-like groove of sleeve, elongated slot, short slot respective outer side edges so that orifice size is smoothly increased.

5. a kind of vehicle shock absorber hydraulic buffering mechanism according to claim 4, it is characterised in that：By changing sleeve Horn-like groove, elongated slot, short groove area, and change the circumferentially uniformly distributed convex surface area of limit base, convex curve surface shape, change slow Rush initial stage damping force growth rate.

6. a kind of vehicle shock absorber hydraulic buffering mechanism according to claim 1 or claim 4, it is characterised in that：It is logical Change sleeve axial length is crossed, realizes that hydraulic cushion power size changes with active position is started.