CN110082237B - Shifting fork foot surface friction testing machine and testing method thereof - Google Patents
Shifting fork foot surface friction testing machine and testing method thereof Download PDFInfo
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- CN110082237B CN110082237B CN201910313723.XA CN201910313723A CN110082237B CN 110082237 B CN110082237 B CN 110082237B CN 201910313723 A CN201910313723 A CN 201910313723A CN 110082237 B CN110082237 B CN 110082237B
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- 238000005299 abrasion Methods 0.000 claims abstract description 3
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/56—Investigating resistance to wear or abrasion
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/005—Electromagnetic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/023—Pressure
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Abstract
The invention relates to the technical field of vehicle part test equipment, in particular to a gear shifting fork foot surface friction testing machine and a testing method thereof, wherein the gear shifting fork foot surface friction testing machine comprises a workbench frame, a testing machine frame, an electric control system, a testing tool, a rotary driving device and a vertical reciprocating driving device; the test tool comprises a tool support, a double-layer friction disc and a shifting fork, wherein the double-layer friction disc is rotatably arranged at the working end of the rotary driving device, and the shifting fork is arranged at the working end of the vertical reciprocating driving device; the precise cylinder drives the shifting fork to be attached to the friction disc, the spindle motor drives the double-layer friction disc to rotate for a period of time, and then the abrasion degree of the shifting fork is detected; the testing machine can realize friction test of the shifting fork working face under the action of variable pressure, and has small volume, low manufacturing cost and simple control and adjustment.
Description
Technical Field
The invention relates to the technical field of vehicle part test equipment, in particular to a gear shifting fork foot surface friction testing machine and a testing method thereof.
Background
The gearbox is an important transmission device in a speed change control system, is widely used in automobiles and other machines, and the shifting fork is one of key parts in the gearbox.
The existing processing and testing of the whole gearbox are mature, and related detection equipment is developed at home and abroad; however, a mature detection device is not available for friction test of a shifting fork in a gearbox. The traditional detection method is as follows: the assembled whole gearbox is adopted to test on a gearbox test bed, and the friction life of the shifting fork is indirectly tested through testing the performance of the whole gearbox. The method forces enterprises engaged in the production of the shifting fork to be provided with a whole set of gearbox bench test bed, and each time a shifting fork is developed, a whole set of gearbox is purchased for bench test, so that the method is very inconvenient for enterprises engaged in the research and the production of the shifting fork, has high cost, and has certain resource waste, thereby greatly restricting the development of new products.
Disclosure of Invention
The invention aims to provide a gear shifting fork foot surface friction testing machine and a testing method thereof, which can realize friction test of a fork working surface under the action of variable pressure, and have the advantages of small size, low manufacturing cost and simple control and adjustment.
To achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a shift fork instep friction testing machine, including work bench, test frame, electrical control system, test frock, rotary driving device and vertical reciprocating driving device;
The test rack is fixedly arranged at the top end of the working rack, the electric control system is arranged in the working rack, the test fixture is arranged in the test rack, and the rotary driving device and the vertical reciprocating driving device are fixedly arranged at the top end of the test rack;
The test tool comprises a tool support, a double-layer friction disc and a shifting fork, wherein the tool support is fixedly arranged in the test rack;
The double-layer friction disc is rotatably arranged at the working end of the rotary driving device, the rotary shaft of the double-layer friction disc is vertically arranged, and the shifting fork is vertically movably arranged at the working end of the vertical reciprocating driving device;
The double-layer friction disc comprises a first friction disc and a second friction disc which are coaxially arranged up and down, the first friction disc and the second friction disc are fixedly connected through a transmission shaft, and the working end of a shifting fork is arranged between the first friction disc and the second friction disc;
The rotary driving device comprises a spindle motor, the vertical reciprocating driving device comprises a precise cylinder, the spindle motor is electrically connected with the electrical control system, and the precise cylinder is communicated with the electrical control system.
As a preferred scheme of shift fork instep friction testing machine, rotary driving device still includes first pivot, second pivot and gear drive, and first pivot and second pivot are all rotatably installed on the frock support, and the rotation axis of first pivot and second pivot is vertical to be set up, and first pivot and second pivot pass through gear drive transmission and connect, and spindle motor's output shaft is connected with first pivot transmission, double-deck friction disc fixed mounting is on the top of second pivot.
As a preferred scheme of gear shift fork instep friction testing machine, vertical reciprocating drive arrangement still includes traveller, linear bearing and connector, and the shift fork fixed mounting is on the traveller, and the traveller can be installed on linear bearing with vertical sliding, and linear bearing fixed mounting is on the frock support, and linear bearing's work shaft is vertical to be set up, and accurate cylinder's work end is vertical to be set up downwards, and accurate cylinder's work end passes through the top fixed connection of connector and traveller.
As a preferred scheme of a gear shifting fork instep friction testing machine, the connector comprises a driving block and a driven block, wherein the driving block is fixedly connected with the working end of a precision cylinder, the driven block is fixedly connected with the top end of a sliding column, the driven block is a flat sliding block which is horizontally arranged, a groove which is in clearance fit with the driven block is formed in the driving block, and a limiting block which is in clearance fit with the sliding column is arranged at the bottom end of the groove.
As a preferable scheme of the gear shift fork foot surface friction testing machine, the driven block and the groove are square.
As a preferable scheme of the gear shift fork foot surface friction testing machine, the electric control system further comprises a precise pressure regulating valve, and the precise cylinder is communicated with the air source through the precise pressure regulating valve.
As a preferred scheme of a gear shifting fork instep friction testing machine, the connector comprises a driving block and a driven block, wherein the driving block is fixedly connected with the working end of a precision cylinder, the driven block is fixedly connected with the top end of a sliding column, the driven block is a flat sliding block which is horizontally arranged, a groove in friction connection with the driven block is formed in the driving block, and a limiting block in clearance fit with the sliding column is arranged at the bottom end of the groove.
As a preferred scheme of the gear shifting fork foot surface friction testing machine, the testing tool further comprises a liquid containing groove, the liquid containing groove is fixedly arranged in the testing machine frame, the liquid containing groove is sleeved outside the tool support, and gearbox oil is filled in the liquid containing groove.
As a preferable scheme of the gear shifting fork foot surface friction testing machine, the surface hardness of the fork is HBW80-105, and the hardness of the friction disc joint surface is 660-800 HV30.
The test method of the gear shift fork foot surface friction tester comprises the following steps:
step one: the precise cylinder drives the shifting fork to move downwards and is attached to the top surface of the second friction disc;
step two: the spindle motor drives the double-layer friction disc to rotate at the speed of 400-600 r/min for 2-4 h;
step three: the spindle motor drives the double-layer friction disc to rotate at a speed of 1800-2200 r/min for 2-4 h;
Step four: the spindle motor drives the double-layer friction disc to rotate at the speed of 900-1100 r/min for 2-4 h;
Step five: the spindle motor drives the double-layer friction disc to rotate at the speed of 3500-4500 r/min for 2-4 h;
step six: the precise cylinder drives the shifting fork to move upwards and be attached to the bottom surface of the first friction disc;
Step seven: repeating the second step to the fifth step;
step eight: and detecting the abrasion degree of the shifting fork.
The invention has the beneficial effects that:
The air source outputs compressed air to the precise air cylinder through the precise pressure regulating valve, so that air pressure with specified pressure is provided for the air cylinder, and specified pressure is applied to the shifting fork, so that the working surface of the shifting fork is attached to the working surface of the double-layer friction disc;
the digital variable frequency control system controls the spindle motor to rotate at a specified rotating speed, and drives the double-layer friction disc to rotate through a 1:1 transmission gear, so that a friction test with a shifting fork is realized;
The switching between the pressure and the pulling of the precise cylinder is realized through the electromagnetic reversing valve, so that the friction test between the front surface and the back surface of the shifting fork and the first friction disc and the second friction disc respectively is realized;
the defect of unstable output power of the precision cylinder is overcome through the sliding connection of the driving block and the driven block and the limiting block for limiting the maximum stroke of the driven block;
the sliding connection of the driving block and the driven block can be changed into friction connection, so that the requirements on the output power and the stroke of the precision cylinder are reduced;
1. The testing machine can realize friction test of the shifting fork working surface under variable pressure;
2. the tester has small volume, low cost and simple control and adjustment.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings that are required to be used in the embodiments of the present invention will be briefly described below. It is evident that the drawings described below are only some embodiments of the present invention and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a perspective view of a shift fork foot friction tester according to an embodiment of the present invention;
FIG. 2 is a left side view of a shift fork foot friction tester according to an embodiment of the present invention;
FIG. 3 is a front view of a shift fork foot friction tester according to an embodiment of the present invention;
FIG. 4 is a cross-sectional view of a shift fork foot friction tester according to an embodiment of the present invention;
FIG. 5 is an enlarged view of a portion of FIG. 4 at A;
FIG. 6 is an internal block diagram of a shift fork foot friction tester according to an embodiment of the present invention;
In the figure:
1. a work bench;
2. A test rack;
3. an electrical control system;
4. testing a tool; 4a, a tool support; 4b, a double-layer friction disc; 4b1, a first friction disc; 4b2, a second friction disc; 4c, shifting fork; 4d, a liquid containing tank;
5. A rotation driving device; 5a, a spindle motor; 5b, a first rotating shaft; 5c, a second rotating shaft; 5d, a gear transmission mechanism;
6. A vertical reciprocating drive means; 6a, a precision cylinder; 6b, a sliding column; 6c, a linear bearing; 6d, a connector; 6d1, a driving block; 6d2, a driven block; 6d3, grooves; 6d4, limiting blocks;
Detailed Description
The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings.
Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to be limiting of the present patent; for the purpose of better illustrating embodiments of the invention, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numbers in the drawings of embodiments of the invention correspond to the same or similar components; in the description of the present invention, it should be understood that, if the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, only for convenience in describing the present invention and simplifying the description, rather than indicating or implying that the apparatus or elements being referred to must have a specific orientation, be constructed and operated in a specific orientation, so that the terms describing the positional relationships in the drawings are merely for exemplary illustration and should not be construed as limiting the present patent, and that the specific meaning of the terms described above may be understood by those of ordinary skill in the art according to specific circumstances.
In the description of the present invention, unless explicitly stated and limited otherwise, the term "coupled" or the like should be interpreted broadly, as it may be fixedly coupled, detachably coupled, or integrally formed, as indicating the relationship of components; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between the two parts or interaction relationship between the two parts. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The first embodiment is as follows:
Referring to fig. 1 to 6, a shifting fork foot surface friction testing machine comprises a working bench 1, a testing bench 2, an electric control system 3, a testing tool 4, a rotary driving device 5 and a vertical reciprocating driving device 6;
The test rack 2 is fixedly arranged at the top end of the working rack 1, the electric control system 3 is arranged in the working rack 1, the test tool 4 is arranged in the test rack 2, and the rotary driving device 5 and the vertical reciprocating driving device 6 are fixedly arranged at the top end of the test rack 2;
the test tool 4 comprises a tool support 4a, a double-layer friction disc 4b and a shifting fork 4c, wherein the tool support 4a is fixedly arranged in the test stand 2, and the double-layer friction disc 4b and the shifting fork 4c are arranged in the tool support 4 a;
The double-layer friction disc 4b is rotatably arranged at the working end of the rotary driving device 5, the rotary shaft of the double-layer friction disc 4b is vertically arranged, and the shifting fork 4c is vertically movably arranged at the working end of the vertical reciprocating driving device 6;
the double-layer friction disc 4b comprises a first friction disc 4b1 and a second friction disc 4b2 which are coaxially arranged up and down, the first friction disc 4b1 and the second friction disc 4b2 are fixedly connected through a transmission shaft, and the working end of a shifting fork 4c is arranged between the first friction disc 4b1 and the second friction disc 4b 2;
The rotary driving device 5 comprises a spindle motor 5a, the vertical reciprocating driving device 6 comprises a precision cylinder 6a, the spindle motor 5a is electrically connected with the electrical control system 3, and the precision cylinder 6a is communicated with the electrical control system 3.
The working bench 1 and the test bench 2 are used for bearing and fixedly mounting equipment;
The electric control system 3 comprises an air source, an electromagnetic reversing valve and a digital variable frequency control system;
The air source is used for providing air power for the vertical reciprocating driving device 6, the electromagnetic reversing valve is used for switching the output and the reset of the precise air cylinder 6a, and the digital variable frequency control system is used for controlling the rotating speed of the spindle motor 5 a;
The spindle motor 5a is a high-speed high-torque spindle motor, and the rotary driving device 5 is used for driving the double-layer friction disc 4b to rotate;
The vertical reciprocating driving device 6 is used for driving the shifting fork 4c to vertically reciprocate;
The vertical reciprocation driving device 6 vertically reciprocates so as to be abutted against the bottom surface of the first friction plate 4b1 or the top surface of the second friction plate 4b2, and the vertical reciprocation driving device 6 maintains a certain pressure for a while, and detects the degree of wear of the fork 4 c.
The rotary driving device 5 further comprises a first rotating shaft 5b, a second rotating shaft 5c and a gear transmission mechanism 5d, the first rotating shaft 5b and the second rotating shaft 5c are rotatably arranged on the tool support 4a, rotating shafts of the first rotating shaft 5b and the second rotating shaft 5c are vertically arranged, the first rotating shaft 5b and the second rotating shaft 5c are in transmission connection through the gear transmission mechanism 5d, an output shaft of the spindle motor 5a is in transmission connection with the first rotating shaft 5b, and the double-layer friction disc 4b is fixedly arranged at the top end of the second rotating shaft 5 c.
The spindle motor 5a drives the first rotating shaft 5b to rotate through the coupler, the first rotating shaft 5b drives the second rotating shaft 5c to rotate through the gear transmission mechanism 5d, and the second rotating shaft 5c drives the double-layer friction disc 4b to rotate, so that the work of the automobile friction disc is simulated.
The vertical reciprocating driving device 6 further comprises a sliding column 6b, a linear bearing 6c and a connector 6d, wherein the shifting fork 4c is fixedly arranged on the sliding column 6b, the sliding column 6b can be vertically and slidably arranged on the linear bearing 6c, the linear bearing 6c is fixedly arranged on the tool support 4a, a working shaft of the linear bearing 6c is vertically arranged, a working end of the precise cylinder 6a is vertically downwards arranged, and a working end of the precise cylinder 6a is fixedly connected with the top end of the sliding column 6b through the connector 6 d.
The precision cylinder 6a drives the spool 6b to vertically reciprocate along the axis of the linear bearing 6c through the connection head 6d, thereby vertically reciprocating the fork 4 c.
The connector 6d comprises a driving block 6d1 and a driven block 6d2, the driving block 6d1 is fixedly connected with the working end of the precision cylinder 6a, the driven block 6d2 is fixedly connected with the top end of the slide column 6b, the driven block 6d2 is a flat slide block which is horizontally arranged, a groove 6d3 which is in clearance fit with the driven block 6d2 is formed in the driving block 6d1, and a limiting block 6d4 which is in clearance fit with the slide column 6b is arranged at the bottom end of the groove 6d 3.
When the precise cylinder 6a drives the driving block 6d1 to vertically reciprocate, after the driving block 6d1 needs to move for a certain distance, the driving block 6d1 can drive the driven block 6d2 to move only when the driven block 6d2 is abutted to the upper end of the groove 6d3 or the top end of the limiting block 6d4, so that the moving speed and the stress of the driven block 6d2 are stable, and the factors of the power instability influencing the test result when the precise cylinder 6a is just started are reduced.
The follower block 6d2 and the groove 6d3 are square.
The driven block 6d2 and the groove 6d3 are square such that the driven block 6d2 does not rotate with respect to the groove 6d3, thereby preventing the fork 4c from rotating.
The electrical control system 3 further comprises a precision pressure regulating valve, and the precision cylinder 6a is communicated with an air source through the precision pressure regulating valve.
The precise pressure regulating valve is used for regulating the output power of the precise cylinder 6a, so as to regulate the acting force of the shifting fork 4c abutting against the working surface of the double-layer friction disc 4 b.
The test fixture 4 further comprises a liquid containing groove 4d, the liquid containing groove 4d is fixedly arranged inside the test stand 2, the liquid containing groove 4d is sleeved outside the fixture support 4a, and gearbox oil is filled in the liquid containing groove 4 d.
The liquid containing tank 4d is used for bearing gearbox oil, so that the double-layer friction disc 4b, the shifting fork 4c, the first rotating shaft 5b, the second rotating shaft 5c and the gear transmission mechanism 5d are always positioned in the gearbox oil, and play a role in lubrication while radiating heat, and meanwhile, completely simulate working conditions in the gearbox.
The surface hardness of the fork 4c is 660-800 HV30.
The working principle of the invention is as follows:
The air source outputs compressed air to the precise air cylinder 6a through the precise pressure regulating valve, so that air pressure with specified pressure is provided for the air cylinder, and specified pressure is applied to the shifting fork 4c, so that the working surface of the shifting fork 4c is attached to the working surface of the double-layer friction disc 4 b;
The digital variable frequency control system controls the spindle motor 5a to rotate at a specified rotating speed, and drives the double-layer friction disc 4b to rotate through a 1:1 transmission gear, so that a friction test with the shifting fork 4c is realized;
The switching between the pressing and pulling of the precision cylinder 6a is realized through an electromagnetic reversing valve, so that the friction test between the front surface and the back surface of the shifting fork 4c and the first friction disc 4b1 and the second friction disc 4b2 is realized;
The defect of unstable output power of the precision cylinder 6a is overcome through the sliding connection of the driving block 6d1 and the driven block 6d2 and the limiting block 6d4 for limiting the maximum stroke of the driven block 6d 2;
The sliding connection of the driving block 6d1 and the driven block 6d2 can be changed into friction connection, so that the requirements on the output power and the stroke of the precision cylinder 6a are reduced;
The test steps are as follows:
Step one: the precision cylinder 6a drives the shifting fork 4c to move downwards and is attached to the top surface of the second friction disc 4b 2;
Step two: the spindle motor 5a drives the double-layer friction disc 4b to rotate at the speed of 400-600 r/min for 2-4 h;
step three: the spindle motor 5a drives the double-layer friction disc 4b to rotate at a speed of 1800-2200 r/min for 2-4 h;
Step four: the spindle motor 5a drives the double-layer friction disc 4b to rotate at the speed of 900-1100 r/min for 2-4 h;
Step five: the spindle motor 5a drives the double-layer friction disc 4b to rotate at the speed of 3500-4500 r/min for 2-4 h;
step six: the precision cylinder 6a drives the shifting fork 4c to move upwards and be attached to the bottom surface of the first friction disc 4b 1;
Step seven: repeating the second step to the fifth step;
step eight: the degree of wear of the fork 4c is detected.
The second embodiment is as follows:
The difference from the first embodiment is that: the connector 6d comprises a driving block 6d1 and a driven block 6d2, the driving block 6d1 is fixedly connected with the working end of the precision cylinder 6a, the driven block 6d2 is fixedly connected with the top end of the slide column 6b, the driven block 6d2 is a flat slide block which is horizontally arranged, a groove 6d3 which is in friction connection with the driven block 6d2 is formed in the driving block 6d1, and a limiting block 6d4 which is in clearance fit with the slide column 6b is arranged at the bottom end of the groove 6d 3.
When the precise cylinder 6a drives the driving block 6d1 to vertically reciprocate, the driving block 6d1 drives the driven block 6d2 to vertically reciprocate through the friction connection between the groove 6d3 and the driven block 6d2, when the shifting fork 4c is abutted against the double-layer friction disc 4b, the driven block 6d2 stops moving, the driving block 6d1 overcomes the friction force between the groove 6d3 and the driven block 6d2 and continuously moves to the end point of the stroke of the precise cylinder 6a, the acting force of the shifting fork 4c abutted against the double-layer friction disc 4b is always equal to the friction force between the groove 6d3 and the driven block 6d2, and the pressure between the double-layer friction disc 4b and the shifting fork 4c can be changed by changing the friction force by changing the driving block 6d1 or the driven block 6d 2;
The sliding connection between the driving block 6d1 and the driven block 6d2 is changed into friction connection, so that the requirement on the precision of the precision cylinder 6a is reduced, and meanwhile, the driving block 6d1 and the driven block 6d2 cannot rotate relatively.
It should be understood that the above description is only illustrative of the preferred embodiments of the present application and the technical principles employed. It will be apparent to those skilled in the art that various modifications, equivalents, variations, and the like can be made to the present application. Such variations are intended to be within the scope of the application without departing from the spirit thereof. In addition, some terms used in the description and claims of the present application are not limiting, but are merely for convenience of description.
Claims (4)
1. The test method of the shifting fork foot surface friction testing machine is characterized by comprising a working bench (1), a testing bench (2), an electric control system (3), a testing tool (4), a rotary driving device (5) and a vertical reciprocating driving device (6);
the test machine frame (2) is fixedly arranged at the top end of the workbench frame (1), the electric control system (3) is arranged in the workbench frame (1), the test tool (4) is arranged in the test machine frame (2), and the rotary driving device (5) and the vertical reciprocating driving device (6) are fixedly arranged at the top end of the test machine frame (2);
The test tool (4) comprises a tool support (4 a), a double-layer friction disc (4 b) and a shifting fork (4 c), wherein the tool support (4 a) is fixedly arranged in the test stand (2), and the double-layer friction disc (4 b) and the shifting fork (4 c) are arranged in the tool support (4 a);
The double-layer friction disc (4 b) is rotatably arranged at the working end of the rotary driving device (5), the rotary shaft of the double-layer friction disc (4 b) is vertically arranged, and the shifting fork (4 c) is vertically movably arranged at the working end of the vertical reciprocating driving device (6);
the double-layer friction disc (4 b) comprises a first friction disc (4 b 1) and a second friction disc (4 b 2) which are coaxially arranged up and down, the first friction disc (4 b 1) and the second friction disc (4 b 2) are fixedly connected through a transmission shaft, and the working end of a shifting fork (4 c) is arranged between the first friction disc (4 b 1) and the second friction disc (4 b 2);
the rotary driving device (5) comprises a spindle motor (5 a), the vertical reciprocating driving device (6) comprises a precision cylinder (6 a), the spindle motor (5 a) is electrically connected with the electric control system (3), and the precision cylinder (6 a) is communicated with the electric control system (3);
The rotary driving device (5) further comprises a first rotating shaft (5 b), a second rotating shaft (5 c) and a gear transmission mechanism (5 d), the first rotating shaft (5 b) and the second rotating shaft (5 c) are rotatably arranged on the tool support (4 a), the rotating shafts of the first rotating shaft (5 b) and the second rotating shaft (5 c) are vertically arranged, the first rotating shaft (5 b) and the second rotating shaft (5 c) are in transmission connection through the gear transmission mechanism (5 d), an output shaft of the spindle motor (5 a) is in transmission connection with the first rotating shaft (5 b), and the double-layer friction disc (4 b) is fixedly arranged at the top end of the second rotating shaft (5 c);
The vertical reciprocating driving device (6) further comprises a sliding column (6 b), a linear bearing (6 c) and a connector (6 d), wherein the shifting fork (4 c) is fixedly arranged on the sliding column (6 b), the sliding column (6 b) can be vertically and slidably arranged on the linear bearing (6 c), the linear bearing (6 c) is fixedly arranged on the tool support (4 a), a working shaft of the linear bearing (6 c) is vertically arranged, a working end of the precise cylinder (6 a) is vertically downwards arranged, and the working end of the precise cylinder (6 a) is fixedly connected with the top end of the sliding column (6 b) through the connector (6 d);
The connector (6 d) comprises a driving block (6 d 1) and a driven block (6 d 2), the driving block (6 d 1) is fixedly connected with the working end of the precision cylinder (6 a), the driven block (6 d 2) is fixedly connected with the top end of the sliding column (6 b), the driven block (6 d 2) is a flat sliding block which is horizontally arranged, a groove (6 d 3) which is in friction connection with the driven block (6 d 2) is formed in the driving block (6 d 1), and a limiting block (6 d 4) which is in clearance fit with the sliding column (6 b) is arranged at the bottom end of the groove (6 d 3);
the test method comprises the following steps:
step one: the precision cylinder (6 a) drives the shifting fork (4 c) to move downwards and is attached to the top surface of the second friction disc (4 b 2);
Step two: the spindle motor (5 a) drives the double-layer friction disc (4 b) to rotate at the speed of 400-600 r/min for 2-4 h;
step three: the spindle motor (5 a) drives the double-layer friction disc (4 b) to rotate at a speed of 1800-2200 r/min for 2-4 h;
Step four: the spindle motor (5 a) drives the double-layer friction disc (4 b) to rotate at a speed of 900-1100 r/min for 2-4 h;
step five: the spindle motor (5 a) drives the double-layer friction disc (4 b) to rotate at the speed of 3500-4500 r/min for 2-4 h;
step six: the precision cylinder (6 a) drives the shifting fork (4 c) to move upwards and be attached to the bottom surface of the first friction disc (4 b 1);
Step seven: repeating the second step to the fifth step;
step eight: and detecting the abrasion degree of the shifting fork (4 c).
2. The method according to claim 1, wherein the electrical control system (3) further comprises a precision pressure regulating valve, and the precision cylinder (6 a) is communicated with the air source through the precision pressure regulating valve.
3. The test method of the gear shift fork foot friction tester according to claim 1, wherein the test tool (4) further comprises a liquid containing groove (4 d), the liquid containing groove (4 d) is fixedly arranged in the test stand (2), the liquid containing groove (4 d) is sleeved outside the tool support (4 a), and gearbox oil is filled in the liquid containing groove (4 d).
4. The test method of the gear shift fork foot friction tester according to claim 1, wherein the surface hardness of the fork (4 c) is HBW80-105, and the hardness of the contact surface of the friction disk (4 b) is 660-800 hv30.
Priority Applications (1)
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