CN101886975A - Method for measuring flexibility of piston of brake caliper under low pressure on line - Google Patents
Method for measuring flexibility of piston of brake caliper under low pressure on line Download PDFInfo
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- CN101886975A CN101886975A CN2009100513228A CN200910051322A CN101886975A CN 101886975 A CN101886975 A CN 101886975A CN 2009100513228 A CN2009100513228 A CN 2009100513228A CN 200910051322 A CN200910051322 A CN 200910051322A CN 101886975 A CN101886975 A CN 101886975A
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- caliper
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Abstract
The invention relates to a method for measuring the flexibility of a piston of a brake caliper under low pressure on line. The method comprises the following steps of: connecting the brake caliper with an air source through a pipeline, arranging a valve on the pipeline, and connecting the piston of the brake caliper with an actuating mechanism; arranging a simulating test specimen of a brake disc; opening the valve, injecting compressed air with a first air-pressure value into a caliper body, and closing the valve continuously for first preset time; if an air-pressure value in the caliper body maintains the first air-pressure value all the time within the first preset time, driving the piston to move for several times by using the actuating mechanism, and setting the stroke of driving the piston to move every time by the actuating mechanism to be 3 millimeters; and if the piston cannot move along with the actuating mechanism, or in the multiple times of reset movement of the piston, the stroke of one time of reset movement of the piston is less than 2 millimeters or more than 4 millimeters, judging that the flexibility of the piston is unqualified. In the method, the brake caliper is subjected to pressurizing detection by replacing hydraulic pressure with air pressure, so that the problem of workpiece pollution due to the adoption of the hydraulic pressure detection is prevented, and the detection efficiency is improved.
Description
Technical field
The present invention relates to a kind of method that detects the piston dirigibility of floating caliper.
Background technology
The piston dirigibility is one of most important performance of floating caliper, when hydraulic action when caliper is braked the automobile in advancing, it is mainly reflected in the ability of the mutual conversion of braking and discharging.Owing to be that the caliper after the test must carry out cleaning, causes its detection efficiency speed lower, only is applicable to sampling observation, and is difficult to realize the online detection of caliper by the mode of caliper hydraulic pressurization being tested the piston dirigibility of caliper at present.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of method for measuring flexibility of piston of brake caliper under low pressure on line that utilizes air pressure the piston dirigibility of caliper to be carried out online detection.
The technical solution adopted in the present invention is: a kind of method for measuring flexibility of piston of brake caliper under low pressure on line may further comprise the steps:
Link to each other with compressed air gas source with the caliper of pipeline, on this pipeline, valve is set, and the piston of this caliper is linked to each other with a topworks caliper;
Between the piston/cylinder of this caliper and external friction bar, place a brake disc imitation specimen;
Open valve, utilize source of the gas to inject the pressurized air with first atmospheric pressure value in caliper, continue to close this valve then and reached for first schedule time, observe the atmospheric pressure value in the caliper simultaneously, first atmospheric pressure value is that 2.5bar is to the arbitrary atmospheric pressure value between the 3.5bar;
If the atmospheric pressure value in the caliper remains on first atmospheric pressure value in first schedule time always, then utilize topworks to drive piston and move for several times, and set this topworks to drive the stroke that piston moves be 3mm at every turn; If piston can not be followed topworks and be moved, perhaps in the multiple times of reset movement of piston, once the stroke that moves of piston reset judges then that less than 2mm or greater than 4mm the dirigibility of piston is defective.
The present invention utilizes air pressure to replace hydraulic pressure that caliper is implemented pressurization and detects, thereby has avoided adopting hydraulic pressure to detect the problem of polluting workpiece, has improved detection efficiency, has realized the online detection of piston dirigibility.
Description of drawings
Fig. 1 is the structural representation of pick-up unit used in the present invention.
Embodiment
On-line high-pressure tightness testing method for brake caliper of the present invention can further specify as follows in conjunction with Fig. 1:
At first, link to each other with compressed air gas source 2, on pipeline 3, be provided with valve 4, and the piston 5 of this caliper is linked to each other with a topworks with the caliper 1 of pipeline 3 with caliper.In one embodiment, topworks is a cylinder 7, and cylinder 7 comprises piston rod 71 and push-plate 72, and push-plate 72 is connected with piston 5 with piston rod 71 respectively.
Then, between the piston/cylinder 11 of this caliper 1 and external friction bar 12, place a brake disc imitation specimen 6.The structure of this brake disc imitation specimen 6 is a prior art, does not repeat them here.Place this brake disc imitation specimen 6 and mainly play the effect that simulating brake clamps field working conditions, piston 5 in caliper 1 moves axially a rear flank that props up this brake disc imitation specimen 6, the external friction bar 12 of caliper 1 also produces and moves, and clamps this brake disc imitation specimen 6.
Open valve 4, source of the gas 2 injects the pressurized air with first atmospheric pressure value P1 in caliper 1, continues to close this valve 4 then and reaches for first schedule time, simultaneously the atmospheric pressure value of observing in the caliper 1 by the rain glass 9 that is arranged on the pipeline 3.If the air pressure in the caliper 1 can't remain on first atmospheric pressure value in this first schedule time, caliper 1 or the proving installation phenomenon that leaks air is described.Can check proving installation and caliper 1,, can test again this moment if proving installation has gas leak phenomenon.First atmospheric pressure value is that 2.5bar is to the arbitrary atmospheric pressure value between the 3.5bar.Preferably, the first atmospheric pressure value P1 is 3bar, and this first schedule time is set at the arbitrary value of 1-2 between second, preferably 2 seconds.
If the atmospheric pressure value in the caliper 1 remains on first atmospheric pressure value in first schedule time always, then utilize topworks to drive piston 5 unidirectional mobile several, and setting this topworks, to drive the stroke that piston 5 moves be 3mm at every turn.Preferably, topworks to drive the number of times that piston moves be 3 times.According to the principle of floating caliper as can be known, after each topworks drove that piston is unidirectional and moved 3mm, under the elastic deformation force's of the O-ring seal of piston effect, piston can reset.If piston 5 can not be followed topworks and be moved, perhaps in the multiple times of reset movement of piston, once the stroke that moves of piston reset judges then that less than 2mm or greater than 4mm the dirigibility of piston 5 is defective.
After piston 5 moves for several times, reexamine the atmospheric pressure value in the caliper 1, the atmospheric pressure value in this moment caliper 1 is recorded as the second atmospheric pressure value P2.
Then, utilize the second atmospheric pressure value P2 and the first atmospheric pressure value P1 to calculate gas leakage rate Δ Q in the caliper 1, this gas leakage rate Δ Q that calculates is compared with setting leakage rate, judge the sealing of caliper.The formula that calculates released gas rate is Δ Q=(P1-P2)/T, and wherein T is total test duration, is meant that the pressurized air that has first an atmospheric pressure value P1 from source of the gas 2 beginnings injection to caliper 1 in plays the time of measuring till the second atmospheric pressure value P2.When total test duration T is set at 5 seconds, sets slip and can be set to 0.18cm
3/ s.If the gas leakage rate Δ Q that calculates illustrates that then the sealing of this caliper is defective, even be judged as under the qualified situation and can not use in the dirigibility of piston greater than setting slip.
Claims (6)
1. a method for measuring flexibility of piston of brake caliper under low pressure on line is characterized in that, may further comprise the steps:
Link to each other with compressed air gas source with the caliper of pipeline, on this pipeline, valve is set, and the piston of this caliper is linked to each other with a topworks described caliper;
Between the piston/cylinder of this caliper and external friction bar, place a brake disc imitation specimen;
Open described valve, utilize described source of the gas in caliper, to inject pressurized air with first atmospheric pressure value, continue to close this valve then and reached for first schedule time, observe the atmospheric pressure value in the caliper simultaneously, described first atmospheric pressure value is that 2.5bar is to the arbitrary atmospheric pressure value between the 3.5bar;
If the atmospheric pressure value in the caliper remains on first atmospheric pressure value in first schedule time always, then utilize described topworks to drive described piston and move for several times, and set this topworks to drive the stroke that piston moves be 3mm at every turn; If piston can not be followed topworks and be moved, perhaps in the multiple times of reset movement of piston, once the stroke that moves of piston reset judges then that less than 2mm or greater than 4mm the dirigibility of piston is defective.
2. method for measuring flexibility of piston of brake caliper under low pressure on line as claimed in claim 1 is characterized in that, and is further comprising the steps of:
Check the atmospheric pressure value in the caliper, the atmospheric pressure value in this moment caliper is recorded as second atmospheric pressure value;
Utilize described second atmospheric pressure value and described first atmospheric pressure value to calculate the interior gas leakage rate of caliper, this gas leakage rate that calculates is compared with setting leakage rate, judge the sealing of this caliper.
3. method for measuring flexibility of piston of brake caliper under low pressure on line as claimed in claim 1 is characterized in that, described first schedule time is the arbitrary value of 1-2 between second.
4. method for measuring flexibility of piston of brake caliper under low pressure on line as claimed in claim 1 is characterized in that, described topworks is a cylinder, and described cylinder comprises piston rod and push-plate, and described push-plate is connected with described piston with described piston rod respectively.
5. method for measuring flexibility of piston of brake caliper under low pressure on line as claimed in claim 1 is characterized in that, also is provided with a rain glass on described pipeline, by the atmospheric pressure value in this rain glass inspection caliper.
6. method for measuring flexibility of piston of brake caliper under low pressure on line as claimed in claim 1 is characterized in that, stating topworks, to drive the number of times that described piston moves be 3 times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100513228A CN101886975A (en) | 2009-05-15 | 2009-05-15 | Method for measuring flexibility of piston of brake caliper under low pressure on line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100513228A CN101886975A (en) | 2009-05-15 | 2009-05-15 | Method for measuring flexibility of piston of brake caliper under low pressure on line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101886975A true CN101886975A (en) | 2010-11-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100513228A Pending CN101886975A (en) | 2009-05-15 | 2009-05-15 | Method for measuring flexibility of piston of brake caliper under low pressure on line |
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| CN (1) | CN101886975A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102353528A (en) * | 2011-06-10 | 2012-02-15 | 中国矿业大学 | Tribological performance monitoring and early-warning device and method of disc brake |
| CN107433441A (en) * | 2017-08-11 | 2017-12-05 | 广西汽车集团有限公司 | Piston assembly assembly equipment after a kind of |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03231132A (en) * | 1990-02-06 | 1991-10-15 | Sumitomo Electric Ind Ltd | Leak tester for brake caliper |
| US5315860A (en) * | 1990-05-15 | 1994-05-31 | Alfred Teves Gmbh | Coefficient-of-friction measuring device, in particular for the measurement of coefficients of friction depending on speed |
| CN2659764Y (en) * | 2003-04-24 | 2004-12-01 | 德尔福（上海）动力推进系统有限公司 | Sub-pump dynamic leakage detector of automobile brake |
| CN2824006Y (en) * | 2005-08-19 | 2006-10-04 | 比亚迪股份有限公司 | Detector for sealing performance of automobile fuel system |
| CN201047804Y (en) * | 2007-04-27 | 2008-04-16 | 郭琅琅 | Brake master cylinder vacuum seal testing bench |
-
2009
- 2009-05-15 CN CN2009100513228A patent/CN101886975A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03231132A (en) * | 1990-02-06 | 1991-10-15 | Sumitomo Electric Ind Ltd | Leak tester for brake caliper |
| US5315860A (en) * | 1990-05-15 | 1994-05-31 | Alfred Teves Gmbh | Coefficient-of-friction measuring device, in particular for the measurement of coefficients of friction depending on speed |
| CN2659764Y (en) * | 2003-04-24 | 2004-12-01 | 德尔福（上海）动力推进系统有限公司 | Sub-pump dynamic leakage detector of automobile brake |
| CN2824006Y (en) * | 2005-08-19 | 2006-10-04 | 比亚迪股份有限公司 | Detector for sealing performance of automobile fuel system |
| CN201047804Y (en) * | 2007-04-27 | 2008-04-16 | 郭琅琅 | Brake master cylinder vacuum seal testing bench |
Non-Patent Citations (1)
| Title |
|---|
| 朱桂英: "汽车制动钳密封性能检测的研究", 《液压与气动》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102353528A (en) * | 2011-06-10 | 2012-02-15 | 中国矿业大学 | Tribological performance monitoring and early-warning device and method of disc brake |
| CN107433441A (en) * | 2017-08-11 | 2017-12-05 | 广西汽车集团有限公司 | Piston assembly assembly equipment after a kind of |
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Application publication date: 20101117 |