CN201100404Y

CN201100404Y - Hydraulic sliding prevention braking system piston

Info

Publication number: CN201100404Y
Application number: CNU2007201462408U
Authority: CN
Inventors: 丁信志; 谢佳璋
Original assignee: Kwang Yang Motor Co Ltd
Current assignee: Kwang Yang Motor Co Ltd
Priority date: 2007-07-13
Filing date: 2007-07-13
Publication date: 2008-08-13
Anticipated expiration: 2017-07-13

Abstract

The utility model relates to a piston of a hydraulic anti-skid braking system, comprising a column body and a sealing part, wherein the column body has a circling groove which is formed on the circling surface for the sealing part to sleeve, and the circling groove alternately distinguishes the column body into a separated high-pressure section and a low-pressure section. The circling surface of the high-pressure section is formed with a plurality of resistance grooves, the resistance grooves can increase flowing resistance of liquid in the clearance between the piston and the wall of a cylinder, and the liquid such as oil-pressure liquid is not easy to flow from the high-pressure section to the low-pressure section and leak out during the operating of the piston. Moreover, the oil liquid leakage rate of the piston can be decreased under the situation of not reducing the clearance between the piston and the wall of the cylinder.

Description

The piston of hydraulic pressure anti-skid brake system (ABS)

Technical field

The utility model relates to a kind of piston, particularly a kind of piston of hydraulic pressure anti-skid brake system (ABS).

Background technique

As shown in Figure 1, 2, the existing piston that is used for the hydraulic pressure anti-skid brake system (ABS), comprise a cylindrical body 1 and O shape ring 2, this cylindrical body 1 has one and is formed at its circumferential surface and can encircles 2 sheathed grooves 11 for this O shape, and distinguishes a high pressure section 12 and a low pressure stage 13 of separation on this cylindrical body 1 by this groove 11.

When this piston in the running, its high pressure section 12 meeting contact one hydraulic systems (as shown in phantom in Figure 1) are to promote in order to drive the high-voltage oil liquid of brake system, at this moment, this high-voltage oil liquid can flow from this high pressure section 12 toward these low pressure stages 13 and causes leakage because of pressure, in order to improve this type of oil liquid leakage situation, the general mode that adopts is used for O shape ring 2 that this piston is arranged in pairs or groups, and attempts whereby fluid is blocked in this high pressure section 12.As adopt the O shape of softwood matter to encircle 2, have rerum natura and elasticity preferably, help to prolong its working life, but sealing effect is relatively poor comparatively speaking, and as adopting the O shape ring 2 of hard material, though can reach preferable sealing effect, compared to the O shape ring 2 of softwood matter, the consume of the O shape ring 2 of hard material is serious and working life is shorter.

Another improves the mode of leaking is to install one or two back bracket ring 3 on the groove 11 of this cylindrical body 1 additional, and be used with O shape ring 2 and make this O shape ring 2 not yielding, though the method is than using O shape ring 2 to have better leak preventing effect separately, but cost is higher relatively, and the design of this back bracket ring 3 also can influence the leakproof quality, so be not critical improvement.

Another leak-proof manner promptly is the gap that directly dwindles between piston and casing wall, but this kind mode then needs to improve machining accuracy, make manufacture cost also along with raising, moreover, as the gap of piston and casing wall when too small, be easy to cause the friction between piston and these two rigid objects of casing wall, be unfavorable for the running of mechanism.

The model utility content

Therefore, the purpose of this utility model promptly is to overcome the defective that exists in the prior art, a kind of piston of hydraulic pressure anti-skid brake system (ABS) is provided, and it promptly has excellent sealing effect under the situation in the gap that need not reduce piston and casing wall, and can cooperate than the use of the flexible O shape ring of tool.

For achieving the above object, the utility model provides a kind of piston of hydraulic pressure anti-skid brake system (ABS), comprise a cylindrical body and and be sheathed on Sealing on this cylindrical body, this cylindrical body have one be formed at its circumferential surface around groove, and on this cylindrical body, distinguish a high pressure section and a low-pressure section of separation around groove by this, the circumferential surface of this high pressure section is formed with at least one resistance groove, the sealing part be sheathed on this cylindrical body around on the groove.

Effect of the present utility model is to utilize formed resistance groove on this cylindrical body high pressure section to increase the resistance that fluid flows between the gap, and then reduces the bearing pressure of sealing part and reach preferable sealing effect.

Description of drawings

Fig. 1 is the view of the piston of existing hydraulic pressure anti-skid brake system (ABS);

Fig. 2 is the view of the start situation of existing piston in a cylinder;

Fig. 3 is the view of first preferred embodiment of the piston of the utility model hydraulic pressure anti-skid brake system (ABS);

Fig. 4 is the view that a back bracket ring is installed in second preferred embodiment of the piston of the utility model hydraulic pressure anti-skid brake system (ABS) additional;

Fig. 5 is the view that two back bracket rings are installed in this second preferred embodiment additional; And

Fig. 6 is the view of the start situation of this first preferred embodiment in a cylinder.

Embodiment

About aforementioned and other technology contents, characteristics and effect of the present utility model, in the detailed description of following cooperation two preferred embodiments with reference to the accompanying drawings, can clearly present.

Before the utility model is described in detail, be noted that in the following description similarly assembly is represented with identical numbering.

Shown in Fig. 3,6, be first preferred embodiment of the piston in the utility model hydraulic pressure anti-skid brake system (ABS), comprise a cylindrical body 4 and and be sheathed on Sealing 5 on this cylindrical body 4.

This cylindrical body 4 is made of metal material, and have one be formed at its circumferential surface around groove 41, and on this cylindrical body 4, distinguish a high pressure section 42 and a low-pressure section 43 of separation around groove 41 by this.In the present embodiment, the circumferential surface of this high pressure section 42 is formed with the resistance groove 421 that four spacings equate, but its configuration mode can change further again, thus should not exceed with the explanation of present embodiment, and the quantity of this resistance groove 421 can only be one also.Be formed with a projection 422 on the terminal surface of this high pressure section 42, be used for contact oil pressure valve (as shown in phantom in FIG.) and then promote the fluid of this oil pressure valve.

Sealing part 5 is sheathed on this around on the groove 41, and in the present embodiment, sealing part 5 is an O shape ring, but also can be an X type ring, so should not exceed with the explanation of present embodiment.

As shown in Figure 6, when this piston carries out piston motion, because the high pressure section 42 meeting contacts of its cylindrical body 4 are to oil pressure valve (as shown in phantom in FIG.), make the fluid of flow-like then can flow to this low-pressure section 43 from this high pressure section 42 because of pressure, 421 of these resistance grooves that are formed at this moment on these high pressure section 42 circumferential surfacies cause this fluid must pass through one section long and more rugged path, and increase the resistance that fluid flows between this piston and casing wall gap whereby, and then 5 pressure that must bear of sealing part have been reduced.Therefore, need not bear under the situation of elevated pressures, in design alternative, promptly need not adopt the design (for example Hs90) of high hardness just can reach high pressure (85kg/cm at sealing part 5 ³) sealing effect, moreover suitably the Sealing 5 of hardness has better rerum natura and elasticity, working life is also longer relatively.

In the present embodiment, the rectangular rectangle of the shape of this resistance groove 421, the purpose of this design is will form long and more rugged path to pass through for fluid, and then increase fluid by the time resistance that met with, but this resistance groove 421 also can be shape beyond the right angle rectangle, so should not exceed with the explanation of present embodiment.

Through experiment confirm, adopting the leak-down rate of the piston of present embodiment only is 0.013c.c./hr, low compared to existing 0.28c.c./hr (not containing the back bracket ring) and 0.17c.c./hr (containing the back bracket ring).

Shown in Fig. 4,5, second preferred embodiment for the piston of the utility model hydraulic pressure anti-skid brake system (ABS), be identical haply with this first preferred embodiment, something in common is superfluous words no longer, part wherein inequality is: this piston has more one and is sheathed on this around the back bracket ring 6 on the groove 41, and then can further reduce its leak-down rate.In the present embodiment, the quantity of this back bracket ring 6 only is one, but this piston also can have two two opposite sides that are positioned at sealing part 5 simultaneously, and is sheathed on this respectively at intervals around the back bracket ring 6 on the groove 41, thus, the escape of liquid rate of this piston can descend again.

Conclude above-mentioned, the piston of hydraulic pressure anti-skid brake system (ABS) of the present utility model, the resistance groove 421 that utilization is formed on the high pressure section 42 of this piston cylindrical body 4 increases fluid flow resistance, cause sealing part 5 to adopt the low hardness design can reach high pressure seal result, and also need not can significantly reduce the escape of liquid rate of this piston under the too meticulous situation, so can reach this novel purpose really in the gap of not having this back bracket ring 6 and this piston and casing wall.

The above only is preferred embodiment of the present utility model, can not limit the scope of this novel enforcement with this, be that all simple equivalent of doing according to the utility model claim scope and description change and modify, all still belong in the scope that the utility model patent contains.

4 cylindrical bodies

41 around groove

42 high pressure sections

421 resistance grooves

422 projections

43 low-pressure sections

5 seals

6 back bracket rings

Claims

1. the piston of a hydraulic pressure anti-skid brake system (ABS), it is characterized in that, comprise cylindrical body and be sheathed on Sealing on this cylindrical body, this cylindrical body have be formed at its circumferential surface around groove, and on this cylindrical body, distinguish the high pressure section and the low-pressure section of separation around groove by this, the circumferential surface of this high pressure section is formed with at least one resistance groove, the sealing part be sheathed on this cylindrical body around on the groove.

2. the piston in the hydraulic pressure anti-skid brake system (ABS) according to claim 1 is characterized in that, this resistance groove be shaped as the right angle rectangle.

3. the piston in the hydraulic pressure anti-skid brake system (ABS) according to claim 2 is characterized in that, the circumferential surface of this high pressure section is formed with the resistance groove that four spacings equate.

4. the piston in the hydraulic pressure anti-skid brake system (ABS) according to claim 3 is characterized in that, is formed with a projection on the terminal surface of this high pressure section.

5. the piston in the hydraulic pressure anti-skid brake system (ABS) according to claim 4 is characterized in that, the sealing part is an O shape ring.

6. the piston in the hydraulic pressure anti-skid brake system (ABS) according to claim 5 is characterized in that, more comprises a back bracket ring, this back bracket ring set be located at this cylindrical body around on the groove.

7. the piston in the hydraulic pressure anti-skid brake system (ABS) according to claim 5 is characterized in that, more comprises two back bracket rings, described back bracket ring be sheathed on respectively this cylindrical body around on the groove, and lay respectively at the both sides of sealing part at intervals.