CN112129515B - Vacuum booster's endurance test platform - Google Patents

Vacuum booster's endurance test platform Download PDF

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Publication number
CN112129515B
CN112129515B CN202011308334.7A CN202011308334A CN112129515B CN 112129515 B CN112129515 B CN 112129515B CN 202011308334 A CN202011308334 A CN 202011308334A CN 112129515 B CN112129515 B CN 112129515B
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China
Prior art keywords
loading
oil
vacuum booster
adjusting
compensator
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CN202011308334.7A
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CN112129515A (en
Inventor
陈章明
李洪
徐谦
张朋岭
彭宏丛
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Jiangxi Jiangling Group Shenling Auto Parts Co ltd
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Jiangxi Jiangling Group Shenling Auto Parts Co ltd
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Priority to CN202011308334.7A priority Critical patent/CN112129515B/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M13/00Testing of machine parts
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M17/00Testing of vehicles
    • G01M17/007Wheeled or endless-tracked vehicles

Abstract

The invention discloses a durability test bed of a vacuum booster, and belongs to the technology of durability test of mechanical parts. The testing device comprises a base, a testing bench, a first loading mechanism, a second loading mechanism, a rectangular actuating block, an oil pressure compensator and an oil quantity compensator. And an output shaft of the second loading mechanism is provided with a second pressure sensor and a second displacement sensor. The rectangular actuating block is pressed on a pedal of the vacuum booster, two adjacent edges of the rectangular actuating block are provided with hinge points, one hinge point is connected with an output shaft of the first loading mechanism, and the other hinge point is connected with an output shaft of the second loading mechanism. The first loading mechanism and the second loading mechanism act on the rectangular actuating block to fit the force application state of the pedal, the oil pressure compensator improves the brake oil pressure, the actual working environment of the vacuum booster is simulated, and the accuracy of the endurance test is improved.

Description

Vacuum booster's endurance test platform
Technical Field
The invention relates to a durability test technology, in particular to a durability test bed of a vacuum booster.
Background
In braking a vehicle, a vacuum booster is used to assist the driver in performing a braking operation in order to reduce driving intensity. The vacuum booster with good durability can ensure the reliability of automobile braking, the durability of the vacuum booster is generally required to be tested, and the testing environment is required to meet the actual operation environment as much as possible. For example, a vacuum booster push rod swing angle test mechanism of CN208270212U adopts a rocker arm structure to simulate pedal acting force in consideration of the fact that the cylinder direct pushing is not in accordance with the actual operation environment. CN110082090A discloses a durability test stand. In the equipment, the acting force transmitted by the transmission shaft acts on a sample piece to be tested through the swinging of the swing arm and the sliding of the swing arm fixing clamp, and the actual vehicle state is expected to be simulated. However, this case cannot determine the force and the acting distance actually acting on the pedal of the vacuum booster. CN107167325A discloses a method for detecting the liquid supplementing performance of an electronic booster with a master cylinder assembly. The method designs a boosting mechanism for compensating brake oil, which is used for simulating the actual fluid infusion environment of a brake pad. In addition, the test apparatus of CN105136476A was equipped with a vacuum pump and a pneumatic pressure detecting apparatus in view of the problem of vacuum pumping of the booster. In order to improve the accuracy of the endurance test, it is necessary to develop a better endurance test bed for simulating the working environment of the vacuum booster.
Disclosure of Invention
The invention provides a durability test bed of a vacuum booster, which simulates the working environment of the vacuum booster and improves the accuracy of a durability test.
A durability test stand of a vacuum booster is characterized by comprising:
the base is provided with a first adjusting mechanism, a second adjusting mechanism and a third adjusting mechanism;
the test bench is used for fixing the vacuum booster, and the test bench is arranged on the base in an angle-adjustable manner;
the first loading mechanism is hinged to the first adjusting mechanism, and an output shaft of the first loading mechanism is provided with a first pressure sensor and a first displacement sensor;
the second loading mechanism is hinged to the second adjusting mechanism, and an output shaft of the second loading mechanism is provided with a second pressure sensor and a second displacement sensor;
the rectangular actuating block is pressed on a pedal of the vacuum booster, two adjacent edges of the rectangular actuating block are provided with hinge points, one hinge point is connected with an output shaft of the first loading mechanism, and the other hinge point is connected with an output shaft of the second loading mechanism;
the oil pressure compensator is used for compensating the oil pressure of the vacuum booster, the oil pressure compensator is arranged on the third adjusting mechanism, and a brake oil outlet of the vacuum booster is connected to the oil pressure compensator;
and the oil quantity compensator is used for supplementing the oil quantity of the vacuum booster, the oil quantity compensator is arranged on the third adjusting mechanism, and a brake oil inlet of the vacuum booster is connected to the oil quantity compensator.
In the invention, the output value F of the first pressure sensor is detected1Output value L of the first displacement sensor1Output value F of the second pressure sensor2And the output value L of the second displacement sensor2Satisfying the constraint condition, if not, adjusting L2
In the invention, the hinge point of the first loading mechanism and the first adjusting mechanism is A, the hinge point of the second loading mechanism and the second adjusting mechanism is B, the central point of the rectangular actuating block is O, and the output value of the first pressure sensor is F1The output value of the first displacement sensor is | OA | and the output value of the second pressure sensor is F2The output value of the second displacement sensor is | OB | and the distance between a and B is | AB | and the constraint condition includes:
in the present invention, the hinge point of the first loading mechanism and the rectangular actuating block is C, the distance between C and the center point O is | OC | and the minimum distance between the pedal-applied counter-supporting force on the rectangular actuating block and the center point O is S, and the constraint conditions include:
the oil pressure compensator comprises a pressure increasing pipe, a spring, a partition plate and a guide post, wherein the inner side wall of the pressure increasing pipe is provided with a convex ring, one end of the spring is fixed on the inner side wall of the pressure increasing pipe, the other end of the spring is pressed on the partition plate, the convex ring is supported on the lower surface of the partition plate, the guide post penetrates out of the pressure increasing pipe through the partition plate, the guide post is provided with a supporting plate and a sealing plate, the supporting plate is positioned below the partition plate, the outer diameter of the supporting plate is smaller than the inner diameter of the convex ring, the sealing plate and the pressure increasing pipe form an oil.
In the invention, a third displacement sensor is arranged at the top of the guide post.
In the invention, the first adjusting mechanism is provided with a cross rod, a sliding table and a side plate, the sliding table is movably arranged on the cross rod, the side plate is arranged on the sliding table, the tail part of the first loading mechanism is hinged on the side plate, the side plate is provided with an arc-shaped groove, and the first loading mechanism is provided with a positioning column extending into the arc-shaped groove.
In the invention, the test bench is provided with a bottom plate, a first clamping part and a second clamping part, one end of the bottom plate is hinged on the base, the other end of the bottom plate is connected to the base through a screw mechanism, the first clamping part and the second clamping part are movably arranged on the bottom plate, and the first clamping part and the second clamping part are respectively positioned at two sides of the vacuum booster.
In the invention, the bottom of the oil quantity compensator is connected to the brake oil inlet through a second pipeline, and the height above the ground of the oil quantity compensator is larger than that of the vacuum booster.
According to the endurance test bed of the vacuum booster, the first loading mechanism and the second loading mechanism act on the rectangular actuating block to fit the pedal force application state, the oil pressure compensator improves the brake oil pressure, the actual working environment of the vacuum booster is simulated, and the accuracy of the endurance test is improved. The oil quantity compensator improves the position of the brake oil page, and prevents air from entering a brake oil channel after the vacuum booster is obliquely arranged.
Drawings
Fig. 1 is a vacuum booster for which durability is to be detected.
FIG. 2 is a front view of a durability test stand of the vacuum booster of the present invention;
FIG. 3 is a partial view of FIG. 2, primarily illustrating a first loading mechanism and a first adjustment mechanism;
FIG. 4 is another partial view of FIG. 2, primarily illustrating a second loading mechanism and a second adjustment mechanism;
FIG. 5 is a cross-sectional view of the oil pressure compensator of FIG. 2;
FIG. 6 is a simplified diagram of the first loading mechanism, the second loading mechanism and the rectangular actuating block of the present invention;
FIG. 7 is a force analysis diagram of the rectangular actuator block of the present invention;
FIG. 8 is a torque analysis diagram of the rectangular actuator block of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.
Fig. 1 shows a vacuum booster 10 for testing durability, which includes a housing 11, a support arm 12, a control valve 13, a pedal 14, a link 15, and an oil tank 16, wherein the support arm 12 is fixed on one side of the housing 11, and the control valve 13 is located on the other side of the housing 11. The pedal 14 is hinged to the supporting arm 12, and one end of the connecting rod 15 is connected with the pedal 14, and the other end of the connecting rod extends into the shell 11. The interior of the housing 11 is a gas chamber, and a row of vacuum tubes 17 are mounted on the housing 11. A reservoir 16 is fixed to the control valve 13, and the control valve 13 has a brake fluid inlet 18 communicating with the reservoir 16 and a brake fluid outlet 19 communicating with the brake disc.
The endurance test stand 20 of the vacuum booster 10 shown in fig. 2 to 8 mainly includes a base 21, a test bed 90, a first loading mechanism 40, a second loading mechanism 50, a rectangular actuating block 60, two oil pressure compensators 70 and an oil volume compensator 80.
The base 21 is provided with a first adjusting mechanism 22, a second adjusting mechanism 23, and a third adjusting mechanism 24. The first adjustment mechanism 22 has a cross bar 31, a slide table 32, and a pair of side plates 33. The cross rod 31 is sleeved between the two upright posts 30, and the screw rod 36 is rotated by the handle 35, so that the screw rod 36 drives the cross rod 31 to move up and down. In addition to being self-locking by means of the screw 36, the crossbar 31 is also locked to the crossbar 31 by means of a positioning pin 37. The slide table 32 is movably mounted on the cross bar 31, and a positioning block 38 is pressed on the slide table 32 for maintaining the position of the slide table 32. The side plate 33 is mounted on the slide table 32, and the rear portion of the first loading mechanism 40 is hinged to the side plate 33. The side plate 33 has an arc-shaped slot 34, and the first loading mechanism 40 has a positioning column 39 extending into the arc-shaped slot 34. The first loading mechanism 40 is free to rotate about the side plate 33 depending on the change in the point of action. With this configuration, the first adjustment mechanism 22 can complete the adjustment of the installation position of the first loading mechanism 40 in the transverse and longitudinal directions. The second adjustment mechanism 23 and the third adjustment mechanism 24 have a similar structure to the first adjustment mechanism 22, and are not described in detail here.
The test stand 90 is used to fix the vacuum booster 10, and the test stand 90 is angularly adjustably mounted on the base 21. The test stage 90 has a base plate 91, a first clamping portion 92, and a second clamping portion 93, one end of the base plate 91 is hinged to the base 21, and the other end is connected to the base 21 via a screw mechanism 94, the first clamping portion 92 and the second clamping portion 93 are movably mounted on the base plate 91, and the first clamping portion 92 and the second clamping portion 93 are respectively located on both sides of the vacuum booster 10. In the present invention, the first and second clamping portions 92 and 93 have positioning chambers 95, and are fixed to the housing 11 of the vacuum booster 10 by means of both-side positioning. Since the test stage 90 mainly receives a lateral thrust, a positioning block 97 is provided behind the first clamping portion 92 for maintaining the positions of the first clamping portion 92 and the second clamping portion 93. Rotation of the screw mechanism 94 adjusts the length of the screw mechanism 94 extending out of the support 96, thereby adjusting the tilt angle of the test rig 90.
The first loading mechanism 40 is hinged to the first adjusting mechanism 22, and a first pressure sensor 42 and a first displacement sensor 43 are arranged on an output shaft 41 of the first loading mechanism 40. Specifically, the first loading mechanism 40 includes a servo electric cylinder 44 and a fixing plate 45, the fixing plate 45 is connected to the first adjusting mechanism 22, a first pressure sensor 42 is installed in the middle of the output shaft 41 of the first loading mechanism 40, a first displacement sensor 43 is installed on a side wall of the servo electric cylinder 44, and a detection end of the first displacement sensor 43 corresponds to the extension portion 46 of the output shaft 41. Correspondingly, the second loading mechanism 50 is hinged to the second adjusting mechanism 23, and a second pressure sensor 52 and a second displacement sensor 53 are arranged on an output shaft 51 of the second loading mechanism 50. The rectangular actuating block 60 is pressed on the pedal 14 of the vacuum booster 10, and two adjacent edges of the rectangular actuating block 60 are provided with hinge points, wherein one hinge point is connected with the output shaft of the first loading mechanism 40, and the other hinge point is connected with the output shaft of the second loading mechanism 50. In the invention, the two hinge points are respectively positioned at the center of the corresponding edges. The first loading mechanism 40 and the second loading mechanism 50 act on the rectangular actuating block 60 to fit the pedal force application state, so that the accuracy of the endurance test is improved.
The oil pressure compensator 70 increases the brake oil pressure to simulate the actual operating environment of the vacuum booster 10. The oil pressure compensator 70 is mounted on the third regulation mechanism 24, and the brake oil outlet 19 of the vacuum booster 10 is connected to the oil pressure compensator 70. The oil pressure compensator 70 includes a pressure increasing pipe 71, a spring 72, a partition plate 73, and a guide post 74, wherein the inner side wall of the pressure increasing pipe 71 has a convex ring 75, one end of the spring 72 is fixed on the inner side wall of the pressure increasing pipe 71, the other end of the spring is pressed on the partition plate 73, the convex ring 75 is supported on the lower surface of the partition plate 73, the guide post 74 passes through the partition plate 73 and penetrates out of the pressure increasing pipe 71, the guide post 74 is provided with a support plate 76 and a sealing plate 77, the support plate 76 is positioned below the partition plate 73, the outer diameter of the support plate 76 is smaller than the inner diameter of the convex ring 75, the sealing plate 77 and the pressure increasing pipe 71 form an oil. After the brake oil enters the oil chamber 78, the guide post 74 is pushed to move upwards, and after the supporting plate 76 contacts the partition plate 73, the partition plate 73 is driven to move, the pressure of the spring 72 is received, and the resistance is increased. The stress condition of the brake oil is divided into two stages, and the two stages are adapted to the working condition of the brake pad. The top of the guide post 74 is provided with a third displacement sensor 79 for measuring the extension of the guide post 74, which is matched to the stroke of the brake pad.
The oil amount compensator 80 serves to supplement the oil amount of the vacuum booster 10. An oil amount compensator 80 is mounted on the third adjusting mechanism 24, and the brake oil inlet 18 of the vacuum booster 10 is connected to the oil amount compensator 80. Brake oil is stored in the oil quantity compensator 80, the bottom of the oil quantity compensator 80 is connected to the brake oil inlet 18 through a second pipeline 82, the ground clearance of the oil quantity compensator 80 is larger than that of the vacuum booster 10, the oil quantity compensator 80 improves the position of the brake oil page, and air is prevented from entering a brake oil channel after the vacuum booster 10 is obliquely arranged. To mount the first loading mechanism 40 and the second loading mechanism 50, the test stage 90 is arranged obliquely. The vacuum booster 10 is in an inclined state, and the structure ensures that the inside of the pipeline is always filled with brake oil.
In the actual braking process, the stepping on the pedal 14 of the vacuum booster 10 shows that the sole of the foot of the operator moves obliquely downwards, the sole mainly rotates around the heel, and the sole is less autorotative. As the technical key point of the invention, the rectangular actuating block 60 simulates the motion state of the sole of a foot under the action of two groups of loading mechanisms. The rectangular actuator block 60 moves along the first loading mechanism 40 and rotates about the hinge point of the second loading mechanism 50. The present invention detects the output value F of the first pressure sensor 421Output value L of the first displacement sensor 431A second pressureOutput value F of sensor 522And the output value L of the second displacement sensor 532Whether the constraint condition is satisfied, if the constraint condition is not satisfied, adjusting L2. In actual use, the first loading mechanism 40 outputs a displacement L1The second loading mechanism 50 adjusts L2Simultaneously detecting F1、F2To satisfy the constraint conditions. When the detection result deviates (e.g., 5%), the second loading mechanism 50 adjusts L2. In this embodiment, L1And L2Is the direct output of the displacement sensor, expressed as the elongation of the displacement sensor.
In another case, the displacement sensor outputs the total length of the displacement sensor (original length + elongation). Specifically, a hinge point between the first loading mechanism 40 and the first adjusting mechanism 22 is a, a hinge point between the second loading mechanism 50 and the second adjusting mechanism 23 is B, and a center point of the rectangular actuating block 60 is O. The output value of the first pressure sensor 42 is F1The output value of the first displacement sensor 43 is | OA | and the output value of the second pressure sensor 52 is F2The output value of the second displacement sensor 53 is | OB | and the distance between A and B is | AB | as shown in the figure. Referring to fig. 6, when the pedal 14 rotates at a constant speed, the resultant force of the rectangular actuating block 60 is kept to be zero, and the constraint condition is preferably set:. The hinge point of the first loading mechanism 40 and the rectangular actuating block 60 is C, the distance between C and the center point O is | OC | and the minimum distance between the pedal 14 and the center point O is S, the counter-supporting force applied to the rectangular actuating block 60 (the counter-supporting force acts at point D). Referring to fig. 7, the moment of the rectangular actuator block 60 is zero, preferably setting the constraint:
the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (8)

1. A durability test stand of a vacuum booster is characterized by comprising:
the base is provided with a first adjusting mechanism, a second adjusting mechanism and a third adjusting mechanism;
the test bench is used for fixing the vacuum booster, and the test bench is arranged on the base in an angle-adjustable manner;
the first loading mechanism is hinged to the first adjusting mechanism, and an output shaft of the first loading mechanism is provided with a first pressure sensor and a first displacement sensor;
the second loading mechanism is hinged to the second adjusting mechanism, and an output shaft of the second loading mechanism is provided with a second pressure sensor and a second displacement sensor;
the rectangular actuating block is pressed on a pedal of the vacuum booster, two adjacent edges of the rectangular actuating block are provided with hinge points, one hinge point is connected with an output shaft of the first loading mechanism, and the other hinge point is connected with an output shaft of the second loading mechanism;
the oil pressure compensator is used for compensating the oil pressure of the vacuum booster, the oil pressure compensator is arranged on the third adjusting mechanism, and a brake oil outlet of the vacuum booster is connected to the oil pressure compensator;
and the oil quantity compensator is used for supplementing the oil quantity of the vacuum booster, the oil quantity compensator is arranged on the third adjusting mechanism, and a brake oil inlet of the vacuum booster is connected to the oil quantity compensator.
2. The endurance test rig of claim 1, wherein the output value F of the first pressure sensor is detected1Output value L of the first displacement sensor1Output value F of the second pressure sensor2And the output value L of the second displacement sensor2Satisfying the constraint condition, if not, adjusting L2
Hinge of first loading mechanism and first adjusting mechanismThe joint point is A, the hinge point of the second loading mechanism and the second adjusting mechanism is B, the central point of the rectangular actuating block is O, and the output value of the first pressure sensor is F1The output value of the first displacement sensor is | OA | and the output value of the second pressure sensor is F2The output value of the second displacement sensor is | OB | and the distance between a and B is | AB | and the constraint condition includes:
3. the endurance test rig of claim 2, wherein the pivot point of the first loading mechanism to the rectangular actuator block is C, the distance between C and the center point O is | OC | and the minimum distance between the pedal-applied counter-support force on the rectangular actuator block and the center point O is S, and the constraints include:
4. the endurance test bench of claim 1, wherein the oil pressure compensator comprises a booster pipe, a spring, a partition plate, and a guide post, wherein the inner side wall of the booster pipe is provided with a convex ring, one end of the spring is fixed on the inner side wall of the booster pipe, the other end of the spring presses on the partition plate, the convex ring is supported on the lower surface of the partition plate, the guide post penetrates out of the booster pipe through the partition plate, the guide post is provided with a support plate and a sealing plate, the support plate is positioned below the partition plate, the outer diameter of the support plate is smaller than the inner diameter of the convex ring, and the sealing plate and the booster pipe form an oil chamber which is connected to.
5. The endurance test rig of claim 4, wherein a third displacement sensor is provided at a top of the guide post.
6. The endurance test rig of claim 1, wherein the first adjustment mechanism has a cross bar, a slide table movably mounted on the cross bar, a side plate mounted on the slide table, a tail of the first loading mechanism hinged to the side plate, the side plate having an arcuate slot, the first loading mechanism having a positioning post extending into the arcuate slot.
7. The endurance test rig of claim 1, wherein the test rig has a base plate, a first clamping portion, a second clamping portion, one end of the base plate is hinged to the base and the other end is connected to the base via a screw mechanism, the first clamping portion and the second clamping portion are movably mounted on the base plate, and the first clamping portion and the second clamping portion are located on two sides of the vacuum booster respectively.
8. The endurance test rig of claim 1, wherein a bottom of the oil quantity compensator is connected to the brake oil inlet via a second pipe, and a ground clearance of the oil quantity compensator is greater than that of the vacuum booster.
CN202011308334.7A 2020-11-20 2020-11-20 Vacuum booster's endurance test platform Active CN112129515B (en)

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Application Number Priority Date Filing Date Title
CN202011308334.7A CN112129515B (en) 2020-11-20 2020-11-20 Vacuum booster's endurance test platform

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Application Number Priority Date Filing Date Title
CN202011308334.7A CN112129515B (en) 2020-11-20 2020-11-20 Vacuum booster's endurance test platform

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CN112129515A CN112129515A (en) 2020-12-25
CN112129515B true CN112129515B (en) 2021-03-02

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CN206132335U (en) * 2016-10-08 2017-04-26 上海工程技术大学 Bounding wall loading verifying attachment before car
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