CN112855665B - Displacement measurement test bed of automobile double-cavity hydraulic brake master cylinder - Google Patents
Displacement measurement test bed of automobile double-cavity hydraulic brake master cylinder Download PDFInfo
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- CN112855665B CN112855665B CN202110003367.9A CN202110003367A CN112855665B CN 112855665 B CN112855665 B CN 112855665B CN 202110003367 A CN202110003367 A CN 202110003367A CN 112855665 B CN112855665 B CN 112855665B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
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Abstract
The invention belongs to the field of automobile part testing devices, and relates to a displacement measurement test bed of an automobile double-cavity hydraulic brake master cylinder. The test bed comprises a brake master cylinder piston driving mechanism, a brake master cylinder clamping mechanism, a brake fluid filling and discharging module and a displacement measuring module, data are returned through a pressure sensor and a displacement sensor, a controller can judge whether a brake master cylinder piston runs through a stroke, accurate data of the displacement of a double-cavity brake master cylinder are obtained under the condition that a test piece is not damaged, and system errors caused by bubbles in brake fluid are eliminated by starting a vacuumizing device. The device is suitable for accurately measuring the displacement of the automobile dual-cavity hydraulic brake master cylinder.
Description
Technical Field
The invention belongs to the field of automobile part testing devices, and discloses a displacement measurement test bed of an automobile double-cavity hydraulic brake master cylinder.
Background
The automobile brake system relates to the running safety of the whole automobile, and an automobile brake master cylinder is one of important parts in the brake system and is used for converting mechanical energy input from the outside into hydraulic energy, so that the hydraulic energy is transmitted to a brake wheel cylinder through a pipeline. In order to improve the running safety of automobiles, according to the requirements of traffic laws and standards, the running brake system of modern automobiles adopts a dual-loop brake system, and the corresponding hydraulic brake master cylinder of the automobiles also adopts a series-connection dual-cavity master cylinder. The automobile hydraulic brake master cylinder is generally used as a core component and assembled with a vacuum booster or a hydraulic booster into a whole, and is widely applied to various types of hydraulic brake vehicles.
The displacement of a brake master cylinder is a most critical parameter in a hydraulic brake system, and the design matching of the automobile brake system is established on the basis of sufficient displacement of the master cylinder. Due to the fact that electronic intelligentization of a cab and the increase of other auxiliary facilities of a modern automobile are achieved, too much space cannot be reserved for installation and arrangement of a large-displacement master cylinder, and in addition, too much allowance of the specification of the master cylinder can also lead to lengthening of the stroke of a brake pedal and increase of component cost. For the reasons, the margin reserved in the design of the displacement of the brake master cylinder of the modern automobile is within a reasonable safety factor.
In fact, the displacement of the hydraulic brake master cylinder of the automobile does not depend on the designed value, and is finally formed by machining and assembling a plurality of parts such as a cylinder body, a piston, a push rod and the like. The final displacement value of the hydraulic brake master cylinder which is put into use becomes a very critical parameter due to part machining errors and assembly process differences. If the displacement of the brake master cylinder is insufficient, the hydraulic brake system cannot establish theoretical hydraulic pressure when the brake is stepped on, and the brake torque theoretically calculated by the automobile cannot be achieved in actual running, so that the brake of the automobile is poor and soft due to insufficient brake force.
The serial double-cavity brake master cylinder generally adopted by modern automobiles is provided with two independent hydraulic brake cavities, and the difficulty of accurately, reliably, conveniently and visually testing the displacement of the two cavities is a difficult point to be solved urgently. In the factory in China, when the displacement of a master cylinder is tested, the master cylinder is arranged on an automobile pedal mechanism, brake fluid is added into the master cylinder, and the displacement of the master cylinder is determined by measuring the volume of the discharged brake fluid through stepping on the pedal. This method has the following problems and disadvantages:
1. the method has the advantages that a brake pedal matched with a brake master cylinder is required to be installed for a matching test, the assembly is complicated, the universality is poor, and the pedal needs to be replaced simultaneously when the master cylinder is replaced;
2. the existing double-master cylinder can be simplified into a front spring, a front piston, a rear spring and a rear piston which integrally move linearly in principle, when a driver steps on the brake, the front piston can reach a limit position to realize the brake of the front master cylinder, at the moment, if the driver continues to apply force, the rear piston can continue a short stroke theoretically, but in the stroke, the resistance can rapidly increase along with the advance of the piston, and in the actual operation, the driver hardly steps on the brake to the end and continues to rapidly increase the sole force after the driver does not step on the brake, so that the part belongs to an invalid stroke. The motor used on the test bed replaces human feet to push the piston, force can be applied suddenly, the displacement generated by the stroke can be counted into the displacement of the master cylinder, and meanwhile, the limit of the spring can be frequently touched by multiple times of measurement, so that the brake master cylinder is damaged.
3. The traditional test method adds brake fluid manually, air originally stored in the inner cavity of the main cylinder and the pipeline cannot be fully discharged, so that the brake fluid cannot be fully filled in the inner cavity of the main cylinder, and the measured displacement value of the main cylinder is smaller;
4. in the test of the brake master cylinder, the average value of the brake master cylinder is required to be measured for multiple times by related standards, the traditional test method cannot continuously measure for multiple times, and air is possibly sucked when a piston in the master cylinder retracts during each measurement, so that the deviation of the measured displacement value is large.
Disclosure of Invention
In order to solve the problems in the background art, the invention provides a displacement measurement test bed of an automobile double-cavity hydraulic brake master cylinder, which has the following specific technical scheme:
a displacement measurement test bed of an automobile dual-cavity hydraulic brake master cylinder comprises a supporting frame 5, a brake master cylinder clamping mechanism 1, a brake master cylinder piston driving mechanism 2, a brake fluid filling and discharging module 3, a displacement measurement module 4 and a controller 6, wherein the brake master cylinder clamping mechanism 1, the brake master cylinder piston driving mechanism 2, the brake fluid filling and discharging module 3, the brake fluid filling and discharging module and the controller 6 are arranged in the supporting frame 5; the movable end of the brake master cylinder piston driving mechanism 2 and the brake master cylinder piston push rod 23 are coaxially arranged; the brake fluid filling and discharging module 3 comprises a filling device and a discharging device, and the displacement measuring module 4 comprises a front cavity discharged brake fluid metering device 42, a rear cavity discharged brake fluid metering device 43, a pressure sensor 44, a displacement sensor 45 for recording the displacement of a piston rod of a brake master cylinder, a front cavity liquid level sensor 46 and a rear cavity liquid level sensor 47 which are respectively electrically connected with the controller 6;
the front cavity discharged brake fluid metering device 42 and the rear cavity discharged brake fluid metering device 43 are both vertical hollow cylinders, the lower ends of the vertical hollow cylinders are respectively connected with a front cavity brake fluid outlet and a rear cavity brake fluid outlet of the brake master cylinder test piece 7 through pipelines and valves, the two vertical hollow cylinders are both of equal cross section, and the upper ends of the two vertical hollow cylinders are provided with openings; a front cavity liquid level sensor 46 and a rear cavity liquid level sensor 47 are respectively arranged in the two vertical hollow columns; the sensing end of the pressure sensor 44 is arranged between the movable end of the brake master cylinder piston driving mechanism 2 and one end of the brake master cylinder piston push rod 23, and the movable end of the brake master cylinder piston driving mechanism 2 can press the sensing end of the pressure sensor 44 and push the brake master cylinder piston push rod 23 to move axially.
The design enables the controller to control the starting and stopping or reverse rotation of the piston driving mechanism of the brake master cylinder according to the information returned by the pressure sensor and the displacement sensor, and can also record the liquid level of the discharged brake fluid in real time and calculate the displacement of each cylinder.
When the current cylinder piston has arrived spacing department, the controller can be with the pressure value and the displacement value auto-fitting of passback linear function, when the inflection point appears for the first time in function image, the controller signals, automatic recording liquid level at that time, stop motor operation simultaneously, accomplish experimental record back, the controller starts the motor reversal, returns brake master cylinder piston actuating mechanism. Therefore, the brake fluid height variation caused by invalid travel cannot be counted into a test value, and meanwhile, the test piece is prevented from being damaged during measurement.
Preferably, the brake fluid filling and discharging module 3 further comprises a vacuum pumping device 32 and a vacuum degree measuring device 33 which are communicated with the front cavity brake fluid cavity and the rear cavity brake fluid cavity of the brake master cylinder test piece 7 through pipelines and valves, wherein the vacuum pumping device 32 and the vacuum degree measuring device 33 are respectively and electrically connected with the controller 6, so that system errors caused by bubbles in the brake fluid are eliminated.
The brake master cylinder piston drive mechanism 2 includes a motor 21 and a drive device 22.
To equalize the speed of movement of the master cylinder piston drive, with accurate measurement, the drive means 22 is preferably an electric cylinder driven by an electric motor 21.
In order to make the thrust provided by the master cylinder piston driving mechanism in the standard stroke vary uniformly, so that the controller can conveniently judge the position of the inflection point, preferably, the driving device 22 is a compressed air cylinder driven by the motor 21.
Preferably, the brake master cylinder clamping mechanism 1 comprises two oppositely arranged flanges 11, through holes of the two flanges and the brake master cylinder piston push rod 23 are coaxially arranged, a plurality of support rods 12 vertically connected with a flange plane are uniformly arranged between the two flanges along the circumferential direction, one of the flanges is fixed on the supporting frame 5, the other end of the brake master cylinder piston push rod 23 penetrates through the through hole of the flange, and the support rods 12 are support rods with adjustable support lengths.
The design can lead one set of test bed device to be suitable for automobile brake master cylinders with different types and different installation sizes, and the application range is wider.
The displacement measurement test bed for the automobile double-cavity hydraulic brake master cylinder has the following beneficial effects that:
1. accurate data of the displacement of the double brake master cylinders are obtained under the condition that a test piece is not damaged;
2. the system error caused by the air bubbles in the brake fluid is eliminated;
3. the centering performance is good, the clamping adjustment is simple and convenient, and the application range is wide;
4. the sample may be measured a plurality of times in succession.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a schematic view of a piston driving and clamping device of a brake master cylinder according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a brake fluid vacuum filling module according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a displacement measuring module of a brake master cylinder in an embodiment of the invention;
in the figure: 1. a brake master cylinder clamping mechanism; 2. a brake master cylinder piston drive mechanism; 3. a brake fluid filling and discharging module; 4. a displacement measurement module; 5. a support frame; 6. a controller; 7. brake master cylinder test piece 11, flange; 12. a stay bar; 13. a brake master cylinder piston end connecting rod; 14. a limit bolt;
21. a motor; 22. a compressed air cylinder; 23. a brake master cylinder piston push rod;
31. an on-board oil storage barrel; 32. a vacuum pump; 33. a vacuum sensor; 34. a gas-liquid converter; 35. a liquid storage tank; 36. a tee joint;
41. a displacement valve block; 42. a front chamber discharge brake fluid metering device; 43. a rear chamber exhaust brake fluid metering device 44, a pressure sensor; 45. a displacement sensor; 46. a front chamber liquid level sensor; 47. a rear cavity level sensor 71, an oil can; 72. the oil can is sealed and screwed with a cover;
A1. a liquid outlet of the front cavity of the test piece; A2. a liquid outlet of the rear cavity of the test piece; F1/F2/F3/F4/F5/F6 are all stop valves, and the positions of the stop valves are shown in the attached drawing in detail.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described with reference to the accompanying drawings and specific embodiments. It should be apparent that the described embodiments are only some of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from this embodiment without making any creative effort, shall fall within the protection scope of the present invention.
Referring to the attached drawings 1-4, the test bed for testing the displacement of the hydraulic brake master cylinder of the automobile comprises a brake master cylinder clamping mechanism 1, a brake master cylinder piston driving mechanism 2, a brake fluid filling and discharging module 3, a displacement measuring module 4, a supporting frame 5, a controller 6 and a brake master cylinder piston push rod 23.
The brake master cylinder clamping mechanism 1 comprises two opposite flanges 11, through holes of the two flanges 11 are coaxial with the brake master cylinder piston push rod 23, one flange is fixed on the supporting frame 5 and sleeved outside the brake master cylinder piston push rod 23 in a non-contact mode, and the outer side of the other flange is used for mounting a brake master cylinder test piece 7. 3 brace rods 12 which are vertically connected with the flange plane are uniformly arranged between the two flanges along the circumferential direction, and the length of each brace rod 12 can be adjusted.
The brake master cylinder piston driving mechanism 2 comprises a motor 21 and a compressed air cylinder 22 driven by the motor 21, wherein the motor 21 is a servo motor; the end of the compressed air cylinder, namely the outer end, is the movable end of the master cylinder piston driving mechanism 2 and is coaxial with the brake master cylinder piston push rod 23;
the brake fluid filling and discharging module 3 comprises an on-table oil storage barrel 31 for filling brake fluid, a vacuumizing device 32, a vacuum degree measuring device 33, a gas-liquid converter 34 and a liquid storage tank 35 for discharging the brake fluid; wherein the vacuum pumping device 32 is a vacuum pump, and the vacuum degree measuring device 33 is a vacuum sensor;
the displacement measuring module 4 comprises a front cavity discharged brake fluid metering device 42, a rear cavity discharged brake fluid metering device 43, a pressure sensor 44, a displacement sensor 45 for recording the displacement of a piston rod of a brake master cylinder, a front cavity liquid level sensor 46 and a rear cavity liquid level sensor 47 which are electrically connected with the controller 6; the front cavity discharged brake fluid metering device 42 and the rear cavity discharged brake fluid metering device 43 are glass measuring tubes which are vertically arranged and have equal sections, the upper ends of the glass measuring tubes are opened, the lower ends of the glass measuring tubes are arranged on a valve block 41, and the valve block 41 is respectively communicated with a front cavity oil outlet A1 and a rear cavity oil outlet A2 of a brake master cylinder test piece 7 through pipelines and stop valves F5/F6; a front cavity liquid level sensor 46 is arranged in the front cavity discharged brake fluid metering device 42, and a rear cavity liquid level sensor 47 is arranged in the rear cavity discharged brake fluid metering device 43; and a front cavity oil outlet A1 and a rear cavity oil outlet A2 of a brake master cylinder test piece 7 are respectively branched, connected with a brake fluid filling and discharging module 3 through a hose, a tee joint 36 and a stop valve F3 and then connected with the brake fluid filling and discharging module.
The sensing end of the pressure sensor 44 is arranged between the active end of the master cylinder piston driving mechanism 2 and the master cylinder piston push rod 23, and the active end of the compressed air cylinder 22 can press the sensing end of the pressure sensor 44 and push the master cylinder piston push rod 23 to move axially;
the controller 6 is an integrated computer with a touch screen, is arranged on the supporting frame 5, is in cable connection with the brake master cylinder piston driving mechanism 2, can control the start and stop or reverse rotation of the brake master cylinder piston driving mechanism 2 according to information returned by the pressure sensor 44 and the displacement sensor 45, and can also record the liquid level of the discharged brake fluid in real time according to the information returned by the liquid level sensor and calculate the displacement.
When the brake master cylinder test piece 7 is installed, the length of the stay bar 12 needs to be adjusted, so that when the brake master cylinder piston push rod 23 can be in contact with the brake master cylinder piston end connecting rod 13, the sensing end of the pressure sensor 44 is clamped between the brake master cylinder piston push rod 23 and the brake master cylinder piston end connecting rod 13, the limiting bolt 14 on the stay bar 12 is screwed, the position of the test piece 7 on a test bed is fixed, and the test precision is prevented from being influenced by the play of the test piece in the test.
Before the test is started, the stop valves F5 and F6 are closed, and more than 2/3 of brake fluid is added in advance into the liquid storage barrel 31 of the brake fluid filling and discharging module 3.
During test, the controller 6 of the test bed is started firstly, part of brake fluid is added into the oil can 71 of the test piece 7, the filling amount of the brake fluid does not exceed the maximum scale line of the volume of the oil can 71, and then the sealing screw cap 72 of the oil can is screwed tightly to isolate air from entering the oil can.
The cut-off valve F1 is closed, the cut-off valves F2 and F3 are opened, the vacuum pump 32 is started, and after a negative pressure is generated in the pipe communicating with the sample, the brake fluid in the oil pot 71 and the master cylinder is pumped out through the gas-liquid converter 34. After the brake fluid in the oil pot 71 and the master cylinder is emptied, the vacuum sensor 33 measures that the vacuum degree of the test piece pipeline system reaches a set value, the stop valve F2 is closed, the stop valve F1 is opened, and the brake fluid in the on-table liquid storage barrel 31 is automatically filled into the master cylinder and the oil pot 71 of the test piece 7 under the action of the negative pressure of the system. And when the brake fluid of the oil can 71 reaches the maximum scale value, closing the stop valve F1 and the vacuum pump 32. When the brake fluid stored in the gas-liquid converter 34 reaches a predetermined scale, the stop valve F4 is opened to discharge the brake fluid to the reservoir tank 35 for storage.
And after the vacuum filling is finished, closing the stop valve F3 to disconnect the main cylinder of the test piece 7, the pipeline system and the vacuum filling mechanism 3. The seal screw cap 72 of the oil can is unscrewed, and the displacement stop valves F5 and F6 are opened, so that the brake fluid in the main cylinder of the test piece 7 and the oil can 71 automatically flows into the displacement valve block 41 and the left and right glass measuring tubes 42 and 43 under the action of the height difference. When the brake fluid reaches a certain scale (recommended integral scale), the stop valves F5 and F6 are closed, and the controller 6 records the initial scale number h of the liquid level height in the left and right glass measuring tubes connected with the front and rear cavities of the test piece main cylinder through the liquid level sensor 0 And H 0 At this time, the master cylinder of the test piece 7, the valve block 41 and the pipeline are filled with brake fluid, and gas in the pipeline system is discharged, so that the distortion of discharge capacity test data caused by the fact that the brake fluid is not filled due to the fact that the gas exists in the pipeline is avoided.
The servo motor 21 in the test bed driving mechanism 2 is started through the controller 6, and under the pushing of the servo motor, the compressed air cylinder 22 is driven to drive the brake main cylinder piston push rod 23 to advance, so that the brake fluid pressure in the cavity of the brake main cylinder in the test piece 7 begins to rise. When the thrust reaches a set value, the displacement stop valves F5 and F6 can be opened according to the prompt of a control system. In the test process, the test bed controller 6 collects data of the pressure sensor 44, the displacement sensor 45 and the liquid level sensors 46 and 47 in real time, obtains numerical values of the relation between the input force, the displacement and the liquid level of the brake master cylinder test piece 7, and draws a dynamic curve on a display screen in real time.
When the force value collected by the pressure sensor 44 is suddenly increased and reaches a sudden inflection point, the system judges that the stroke of the master cylinder piston of the test piece 7 is at the end, at this time, the servo motor 21 stops advancing, the compressed air cylinder 22 is locked in position, the test bench completes the pushing of the master cylinder piston of the test piece once, and the brake fluid in the front cavity and the rear cavity of the master cylinder is discharged into the left glass measuring tube 42 and the right glass measuring tube 43 through the hoses and the displacement valve block 41. The controller 6 automatically extracts the liquid level h in the left and right glass measuring tubes 42 and 43 at the time of the inflection point by the liquid level sensors 46 and 47 1 And H 1 . The displacement cutoff valves F5 and F6 are closed.
And driving the servo motor 21 and the air cylinder 22 to retreat to the initial position through the instruction of the test bed control system, returning the test piece push rod to the initial origin under the return force of the piston spring of the brake master cylinder of the test piece 7, and returning and resetting the pressure sensor 44 and the displacement sensor 45.
And the test piece finishes one advancing and retreating process on the test bed to finish one measurement. The number of times n of testing (recommended number of times n = 3) can be set according to standard difference, and one side glass is arranged after the glass is operated on a displacement test bed for n timesFinal height h of liquid level of glass measuring tube n . And finally, the controller 6 can automatically calculate the discharge value V of the front cavity of the sample piece connected with the glass tube on the side according to the inner diameter d of the glass tube and the liquid level height difference delta h for n times. The calculation method of the posterior cavity is the same.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described above, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A displacement measurement test bed of an automobile double-cavity hydraulic brake master cylinder comprises a supporting frame (5), a brake master cylinder clamping mechanism (1), a brake master cylinder piston driving mechanism (2), a brake fluid filling and discharging module (3), a displacement measurement module (4) and a controller (6) which is electrically connected with the brake master cylinder piston driving mechanism (2), wherein the brake master cylinder clamping mechanism, the brake master cylinder piston driving mechanism (2), the brake fluid filling and discharging module and the displacement measurement module are arranged in the supporting frame (5); the movable end of the brake master cylinder piston driving mechanism (2) and the brake master cylinder piston push rod (23) are coaxially arranged; the brake fluid filling and discharging module (3) comprises a filling device and a discharging device, and is characterized in that: the displacement measuring module (4) comprises a front cavity brake fluid discharging metering device (42), a rear cavity brake fluid discharging metering device (43), a pressure sensor (44), a displacement sensor (45) for recording the displacement of a piston rod of a brake master cylinder, a front cavity liquid level sensor (46) and a rear cavity liquid level sensor (47), which are respectively electrically connected with the controller (6);
the front cavity brake fluid discharge metering device (42) and the rear cavity brake fluid discharge metering device (43) are vertical hollow cylinders, the lower ends of the vertical hollow cylinders are respectively connected with the front cavity brake fluid discharge port and the rear cavity brake fluid discharge port of the brake master cylinder test piece (7) through pipelines and valves, the two vertical hollow cylinders are uniform in cross section, and the upper ends of the two vertical hollow cylinders are provided with openings; a front cavity liquid level sensor (46) and a rear cavity liquid level sensor (47) are respectively arranged in the two vertical hollow columns; the sensing end of the pressure sensor (44) is arranged between the movable end of the brake master cylinder piston driving mechanism (2) and one end of the brake master cylinder piston push rod (23), and the movable end of the brake master cylinder piston driving mechanism (2) can press the sensing end of the pressure sensor (44) and push the brake master cylinder piston push rod (23) to move axially.
2. The displacement measuring test bed for the dual-chamber hydraulic brake master cylinder of the automobile as claimed in claim 1, wherein: the brake fluid filling and discharging module (3) further comprises a vacuumizing device (32) and a vacuum degree measuring device (33) which are communicated with the front cavity brake fluid cavity and the rear cavity brake fluid cavity of the brake master cylinder test piece (7) through pipelines and valves, and the vacuumizing device (32) and the vacuum degree measuring device (33) are respectively and electrically connected with the controller (6).
3. The displacement measuring test bed for the dual-chamber hydraulic brake master cylinder of the automobile as claimed in claim 1, wherein: the brake master cylinder piston driving mechanism (2) comprises a motor (21) and a driving device (22).
4. The displacement measuring test bed for the dual-chamber hydraulic brake master cylinder of the automobile as claimed in claim 3, wherein: the driving device (22) is an electric cylinder driven by a motor (21).
5. The displacement measuring test bed of the dual-chamber hydraulic brake master cylinder of the automobile as claimed in claim 3,
it is characterized in that: the drive device (22) is a compressed air cylinder driven by a motor (21).
6. The displacement measuring test bed of the automobile dual-chamber hydraulic brake master cylinder of claim 1, characterized in that: brake master cylinder clamping mechanism (1) includes two relative flanges (11) that set up, the through-hole of two flanges with brake master cylinder piston push rod (23) are coaxial setting, evenly arrange a plurality of vaulting poles (12) of being connected with flange plane is perpendicular between two flanges along circumference, a slice in the flange is fixed on supporting frame (5), the other end of brake master cylinder piston push rod (23) passes this piece the through-hole of flange, vaulting pole (12) are for supporting the vaulting pole that length is adjustable.
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| CN202110003367.9A CN112855665B (en) | 2021-01-04 | 2021-01-04 | Displacement measurement test bed of automobile double-cavity hydraulic brake master cylinder |
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| KR101474170B1 (en) * | 2013-12-10 | 2014-12-17 | 정천교 | Apparatus for measuring brake disk of vehicle |
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