CN108827626B - Cylindrical gear pair quasi-static transmission error test bed and test and data processing method - Google Patents
Cylindrical gear pair quasi-static transmission error test bed and test and data processing method Download PDFInfo
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- CN108827626B CN108827626B CN201810255503.1A CN201810255503A CN108827626B CN 108827626 B CN108827626 B CN 108827626B CN 201810255503 A CN201810255503 A CN 201810255503A CN 108827626 B CN108827626 B CN 108827626B
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Abstract
The invention discloses a cylindrical gear pair quasi-static transmission error test bed and a test and data processing method, which are characterized by comprising a loading assembly, a rotary locking assembly, a test bed supporting assembly, a driving axle assembly and a driven axle assembly; the test bed supporting assembly is sequentially provided with the driving axle assembly and the driven axle assembly which are connected with each other; the loading assembly is arranged at a driving shaft end in the driving shaft assembly; a rotational lock assembly is mounted on a driven shaft end in the driven shaft assembly. The invention achieves the following beneficial effects: 1) the test bed is only provided with a pair of cylindrical gear pairs and a supporting mechanism for meshing transmission of the cylindrical gear pairs, and has compact structure, small occupied space and convenient maintenance; 2) through weight loading, driving devices such as a motor and a magnetic powder brake are not needed, so that the capital can be saved, and the equipment purchasing period can be shortened; 3) the invention can carry out test measurement only by loading the gear adhered with the strain gauge in normal meshing manner.
Description
Technical Field
The invention relates to a cylindrical gear pair quasi-static transmission error test bed and a test and data processing method, and belongs to the technical field of cylindrical gear pair transmission error test.
Background
The gear transmission is the most common mechanical form in mechanical transmission, and has the advantages of reliable work, high efficiency, compact structure, long service life and the like, so the gear transmission is widely applied to various mechanical equipment.
The transmission error is used for measuring the accuracy of gear transmission, and is an important parameter influencing the working precision, vibration, noise, reliability and service life of the gear.
In the process of gear meshing transmission, the tooth profile error, the base pitch error and the tooth flank clearance of the gear are increased along with the expansion of tooth surface abrasion; in addition, the gear in practical application inevitably has manufacturing and installation errors, and the gear teeth can also deform under the action of load. The errors and the deformation destroy the meshing relation of gear transmission, so that the position of the gear during meshing deviates from the theoretical position of the gear, the displacement error excitation of gear meshing is formed, and one of basic parameters for researching the dynamic characteristics of a cylindrical gear pair is the quasi-static transmission error; obtaining accurate quasi-static transmission errors of the cylindrical gear pair is one of the cores of dynamic behavior analysis of the cylindrical gear pair.
At present, a grating type test bed is mostly adopted for a cylindrical gear pair quasi-static transmission error test bed, and a quasi-static transmission error is obtained by measuring a rotation angle difference value of the cylindrical gear pair through a pair of circular gratings. Then, the method has higher requirement on the grating precision, the scale of the grating disc used for the test must meet the requirement on the test precision, and the high-precision grating disc is generally purchased and imported abroad, so that the test cost is high, and the purchase period is long.
Disclosure of Invention
In order to solve the defects of the prior art, the invention aims to provide a cylindrical gear pair quasi-static transmission error test bed and a test and data processing method, which are used for obtaining measured values of cylindrical gear pair quasi-static transmission errors with different tooth shapes.
In order to achieve the above object, the present invention adopts the following technical solutions:
a cylindrical gear pair quasi-static transmission error test bed is characterized by comprising a loading assembly, a rotary locking assembly, a test bed supporting assembly, a driving axle assembly and a driven axle assembly; the test bed supporting assembly is sequentially provided with the driving axle assembly and the driven axle assembly which are connected with each other; the loading assembly is arranged at a driving shaft end in the driving shaft assembly; the rotational lock assembly is mounted to a driven shaft end in the driven shaft assembly.
The quasi-static transmission error test bed for the cylindrical gear pair is characterized in that the loading assembly comprises a loading force arm, a force arm brake disc, a weight, a force arm hook, a hook stop block and a locking bolt; the bottom of the force arm hook is used for placing the weight, and the top of the force arm hook is connected with a loading force arm; the hook stop block is positioned at the free end of the loading force arm and used for preventing the force arm hook from slipping out; the other end of the loading force arm is connected with a force arm brake disc; the moment arm brake disc is positioned on the test bed support assembly; the loading force arm and the force arm brake disc are locked through a locking bolt; the force arm brake disc is provided with a T-shaped groove along the circumferential direction; the head of the locking bolt is positioned in the T-shaped groove of the moment arm brake disc, and a screw rod of the locking bolt passes through a circumferential through hole of the moment arm brake disc through a sliding groove of the moment arm brake disc and is screwed into a matched nut; the moment arm brake disc is connected with the loading moment arm through a locking bolt, and torque is transmitted through friction between the end face of the moment arm brake disc and the end face of the loading moment arm.
The quasi-static transmission error test bed for the cylindrical gear pair is characterized in that the rotary locking assembly comprises a brake, a brake disc and a locking bolt for locking the brake and the brake disc; a T-shaped groove is formed in the brake disc; the brake is arranged on the brake disc; the brake disc is positioned on the test bed supporting component; the head of the locking bolt is positioned in the T-shaped groove of the brake disc, and a screw rod of the locking bolt passes through a circumferential through hole of the brake through a sliding groove of the brake disc and is screwed into a matched nut; the brake disc is connected with the brake through a locking bolt, and torque is transmitted through friction of the end face of the brake disc and the end face of the brake.
The quasi-static transmission error test bed for the cylindrical gear pair is characterized in that the test bed supporting assembly comprises a base, a driving shaft supporting part, a driving shaft supporting end cover, a driven shaft supporting part, a driven shaft supporting end cover, a driving wheel bearing end cover and a driven wheel bearing end cover, wherein the two groups of driving shaft supporting parts, the driving shaft supporting end cover, the driven shaft supporting part, the driven shaft supporting end cover, the driving wheel bearing end cover and the driven wheel bearing end; the driving shaft supporting end cover is arranged at the top of the driving shaft supporting part, and the driving wheel bearing end cover is arranged at the outer sides of the driving shaft supporting end cover and the driving shaft supporting part; the driven shaft supporting end cover is arranged at the top of the driven shaft supporting part, and the driven wheel bearing end cover is arranged at the outer sides of the driven shaft supporting end cover and the driven shaft supporting part; the driving shaft supporting part and the driven shaft supporting part are sequentially distributed on the base; the driving wheel bearing end cover is used for connecting a driving wheel shaft assembly; and the driven wheel bearing end cover is used for connecting a driven wheel shaft assembly.
The quasi-static transmission error test bed for the cylindrical gear pair is characterized in that a threaded hole is formed in the base and used for mounting a driving shaft supporting component and a driven shaft supporting component respectively; the position of the threaded hole is determined according to the center distance of the test gear; the driving shaft supporting end cover and the driving shaft supporting part, and the driven shaft supporting end cover and the driven shaft supporting part are connected through bolts; the driving wheel bearing end cover is connected with the driving shaft supporting end cover and the driving shaft supporting part through bolts; the driven wheel bearing end cover is connected with the driven shaft supporting end cover and the driven shaft supporting part through bolts; the base is also provided with a threaded hole for fixing the brake.
The cylindrical gear pair quasi-static transmission error test bed is characterized in that the driving wheel shaft assembly comprises a driving shaft, a bearing, a driving wheel key, a driving shaft sleeve, a bearing, a moment arm brake disc key, a moment arm brake disc and a driving shaft end stop cover, wherein the bearing, the driving wheel key, the driving shaft sleeve, the bearing, the moment arm brake disc key, the moment arm brake disc and the driving shaft end stop cover are sequentially arranged on; the shaft end baffle cover of the driving shaft is connected with the driving shaft through a bolt; the outer wall of the driving wheel key is provided with a driving wheel, and the driving wheel key is matched with the driving wheel; the outer wall of the moment arm brake disc key is provided with a loading moment arm, and the moment arm brake disc key is matched with the loading moment arm;
the driven wheel shaft assembly comprises a driven shaft, a bearing, a driven wheel key, a driven shaft sleeve, a bearing, a brake disc key, a brake and a driven shaft end stop cover, wherein the bearing, the driven wheel key, the driven shaft sleeve, the bearing, the brake disc key, the brake and the driven shaft end stop cover are sequentially arranged on the driven shaft; the shaft end baffle cover of the driven shaft is connected with the driven shaft through a bolt; the driven wheel is arranged on the outer wall of the driven wheel key, and the driven wheel key is matched with the driven wheel; and a brake disc is arranged on the outer wall of the brake disc key, and the brake disc key is matched with the brake disc.
The quasi-static transmission error test bed of the cylindrical gear pair is characterized in that the driving wheel key and the driven wheel key adopt a double-key structure; the arm braking disc and the brake disc adopt a double-key structure.
A testing method of a cylindrical gear pair quasi-static transmission error test bed is characterized by comprising the following steps:
1) determining the position of the test cylindrical gear pair patch: selecting test gear teeth of a driving wheel and a driven wheel, determining the position of a dangerous section of a tooth root by a tooth root dangerous section method, namely a 30-degree tangent method, and marking the position as a point a; marking the middle position of the wheel rim of the test gear teeth of the selected driving wheel and the selected driven wheel as a point b; the position of the middle point of the wheel flange at the position of four gear teeth which are clockwise or anticlockwise away from the test gear tooth is marked as a point c; polishing points a, b and c of the driving wheel and the driven wheel according to a strain gauge pasting pretreatment standard, and pasting a strain gauge according to a pasting standard;
2) installing a test cylindrical gear pair, ensuring that meshing transmission gear teeth of the cylindrical gear pair are gear teeth which are adhered with strain gauges and the strain gauges bear loads, and respectively locking bolts in a loading assembly and a rotary locking assembly;
3) determining the load: determining the number and the mass of the weights to be selected, wherein the weights comprise weights with different masses and are hung on the force arm hook; and determining a loading distance, and mounting a moment arm hook at a corresponding position on a loading force.
A data processing method of a testing method of a cylindrical gear pair quasi-static transmission error test bed is characterized by comprising the following steps:
a) according to the geometrical relationship of the gear, the strain change at the test point b is utilized to establish a micro-deformation calculation formula epsilon of the wheel rima＝2π×ε2In the formula, epsilon2Measuring the micro deformation at the position b;
b) establishing a gear tooth micro-deformation calculation formula at the test point a when the loading point is positioned at the engagement point A:
εb＝tan(ε1/rε1)×hAin the formula, epsilon1To measure the micro-variation value at a; r isε1Radius for measuring position a; h isATo be engaged withMeasuring the tooth height of the position a from the point;
c) fitting the gear tooth micro-deformation at the points a and b along the direction of the meshing line according to the definition of quasi-static transfer error, wherein the total micro-deformation at the gear tooth meshing point A is epsilonA＝2π×ε2+tan(ε1/rε1)×hA；
d) Respectively establishing total micro-deformation when the loading points are positioned at a double-single meshing area demarcation point B, a node C, a single-double meshing area demarcation point D and a meshing point E by adopting the same method of the steps B) and C);
subtracting the micro-deformation of the driving wheel after fitting from the displacement of the driven wheel to obtain the quasi-static transmission error of the cylindrical gear pair, STEA＝δA is from-δA mainIn the formula, deltaA is fromThe micro-deformation is at the meshing point A of the driven wheel; deltaA mainThe micro-deformation amount at the meshing point A of the driving wheel;
similarly, quasi-static transmission errors of a double-single meshing area demarcation point B, a node C, a single-double meshing area demarcation point D and a meshing point E can be obtained, and the quasi-static transmission error of the meshing transmission of the cylindrical gear pair is obtained.
The invention achieves the following beneficial effects: 1) the test bed has a simple structure, only has a pair of cylindrical gear pairs and a supporting mechanism for meshing transmission of the cylindrical gear pairs, has a compact structure, occupies small space and is convenient to maintain; 2) the test bed is mechanical in structure, and is loaded through the weight, a motor, a magnetic powder brake and other driving devices are not needed, so that the fund can be saved, and the equipment purchase period can be shortened; 3) compared with the traditional material axial fatigue test fixture, the axial fatigue test fixture is convenient to operate, and test measurement can be carried out only by normally meshing and loading the gear attached with the strain gauge.
Drawings
FIG. 1 is a schematic view of a test stand;
FIG. 2 is a schematic layout of a driving axle assembly after parts are disassembled;
FIG. 3 is a schematic layout of a driven axle assembly with parts broken away;
FIG. 4 is a schematic view of a test stand support assembly;
fig. 5 is a schematic diagram of the test gear patch position.
The meaning of the reference symbols in the figures:
1-weight, 2-moment arm hook, 3-hook stop, 4-left support of driving shaft, 5-left support of end cover of driving shaft, 6-driving wheel, 7-right support of end cover of driving shaft, 8-moment arm brake disc, 9-loading moment arm, 10-driven wheel, 11-right support of end cover of driven shaft, 12-brake disc, 13-brake, 14-test bench base, 15-driving shaft, 16-moment arm brake disc key, 17-bearing, 18-driving shaft sleeve, 19-driving shaft end cover, 20-driven wheel key, 21-driven shaft, 22-brake disc key, 23-bearing, 24-driven shaft sleeve, 25-driven shaft end cover, 26-left bearing end cover of driving wheel, 3-left support of driving shaft, 5-left support of end, 27-left driven wheel bearing end cover, 28-left driven wheel bearing end cover, 29-left driven wheel bearing end cover, 30-right driven wheel bearing end cover, 31-right driven wheel bearing, 32-right driving wheel bearing, 33-right driving wheel bearing end cover and 34-driving wheel key.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The test bed structure schematic diagram shown in fig. 1 includes a loading assembly, a rotation locking assembly, a test bed supporting assembly, a driving axle assembly and a driven axle assembly.
The loading assembly consists of a loading arm 9, an arm brake disc 8, a weight 1, an arm hook 2, a hook stop 3 and a locking bolt (a bolt for locking the loading arm and the arm brake disc).
The moment arm brake disc 8 and the loading moment arm 9 are arranged at the right end of the driving shaft 15, and the shaft shoulder and the shaft end stop cover 19 of the driving shaft are positioned at fixed positions through the driving shaft 15; the force arm hook 2 is hung at the end part of the horizontal long arm of the loading force arm 9; the hook stop block 3 is fixed at the end part of the horizontal long arm of the loading force arm 9 through a bolt; the weight 1 is placed on the force arm hook.
The rotation locking assembly consists of a brake 13, a brake disc 12, a locking bolt (a bolt for locking the brake and the brake disc). The brake 13 and the brake disc 12 are arranged at the right end of the driven shaft 21, and the fixed positions of the shaft shoulder and the shaft end baffle cover 25 of the driven shaft are positioned through the driven shaft 21; the head of the locking bolt is positioned in a T-shaped groove of the brake disc 12, and the screw passes through a circumferential through hole of the brake 13 through a sliding groove of the brake disc 12 and is screwed into a matched nut.
The test bed support assembly comprises a test bed base 14, driving shaft support members (namely, a driving shaft support left 4 and a driving shaft support right 32), driving shaft support end covers (in the embodiment, a driving shaft support end cover left 5 and a driving shaft support end cover right 7), driven shaft support members (in the embodiment, a driven shaft support left 29 and a driven shaft support right 31), driven shaft support end covers (in the embodiment, a driven shaft support end cover left 28 and a driven shaft support end cover right 11), driving wheel bearing end covers (in the embodiment, a driving wheel bearing end cover left 26 and a driving wheel bearing end cover right 33), and driven wheel bearing end covers (in the embodiment, a driven wheel bearing end cover left 27 and a driven wheel bearing end cover right 30).
The driving shaft support left 4, the driving shaft support right 32, the driven shaft support left 29 and the driven shaft support right 31 are fixed in threaded holes of the test bed base 14 through bolts, and the threaded holes of the test bed base 14 are determined according to the center distance of the test gears; the driving shaft support end cover left 5 is connected with the driving shaft support left 4 through a bolt.
The driving shaft support end cover right 7 is connected with the driving shaft support right 32 through a bolt; the left 28 of the driven shaft support end cover is connected with the left 29 of the driven shaft support through a bolt; the driven shaft support end cover right 11 is connected with the driven shaft support right 31 through a bolt; the left 26 of the bearing end cover of the driving wheel is connected with the left 5 of the driving shaft support end cover and the left 4 of the driving shaft support through bolts; the driving wheel bearing end cover right 33 is connected with the driving shaft support end cover right 7 and the driving shaft support right 32 through bolts; the left driven wheel bearing end cover 27 is connected with the left driven shaft support end cover 28 and the left driven shaft support 29 through bolts; the driven wheel bearing end cover right 30 is connected with the driven shaft support end cover right 11 and the driven shaft support right 31 through bolts. The test bed base 14 is provided with a threaded hole for fixing the brake 13, and the test bed base 14 and the brake 13 are connected through a bolt.
The driving axle assembly consists of a driving axle 15, a driving axle sleeve 18, a bearing 17, a driving wheel 6, a driving wheel key 34, a moment arm brake disc key 16 and a driving axle end stop cover 19. The driving shaft end stop cover 19 is connected with the driving shaft 15 through a bolt.
The driven wheel shaft assembly consists of a driven shaft 21, a driven shaft sleeve 24, a bearing 23, a driven wheel 10, a driven wheel key 20, a brake disc key 22 and a driven shaft end stop cover 25. The driven shaft end stop cover 25 is connected with the driven shaft 21 through bolts.
According to the sequence from left to right in the attached figure 2 of the specification, the arrangement of related parts on the driving shaft is as follows: the device comprises a bearing, a gear key, a driving wheel, a driving shaft sleeve, a bearing, a moment arm brake disc key, a moment arm brake disc, a loading moment arm and a driving shaft end stop cover.
According to the sequence from left to right in the attached figure 3 of the specification, the arrangement of related parts on the driven shaft is as follows: the brake device comprises a bearing, a gear key, a driven wheel, a driven shaft sleeve, a bearing, a brake disc key, a brake disc, a brake and a driven shaft end stop cover.
In fig. 2 and 3, the left side is a view of the shaft and two keys, and the right side is a view of the shaft assembly including the shaft.
Specifically, the driving axle assembly and the driven axle assembly are mounted on supports in the test stand support assembly. The loading assembly is arranged at the driving shaft end in the driving shaft assembly; a rotational lock assembly is mounted on a driven shaft end in the driven shaft assembly. The left driving wheel support and the right driving wheel support are connected with the bottom of the test bed through bolts. The left driven wheel support and the right driven wheel support are connected with the base of the test bed through bolts. The brake disc is connected with the base of the test bed through a bolt. The left driving wheel support and the right driving wheel support are connected with the supporting end cover through bolts. The left driven wheel support and the right driven wheel support are connected with the supporting end cover through bolts.
The moment arm brake disc is provided with a key slot which is connected with the driving shaft through a key to transmit torque. The brake disc is provided with a key slot, and is connected with the driven shaft through a key to transmit torque. The head of the locking bolt and the screw are respectively matched with the T-shaped grooves in the moment arm brake disc and the brake disc. Through holes which are larger than the bolts and smaller than the diameter of the nuts with the same specification are uniformly distributed on the loading arm of force and the brake along the circumferential direction. The screw rod part of the locking bolt firstly passes through the loading force arm and the through hole of the brake along the circumferential direction and then is screwed into the matched nut. The moment arm brake disc is connected with the loading moment arm through a locking bolt, and torque is transmitted through friction between the end face of the moment arm brake disc and the end face of the loading moment arm.
The brake disc is connected with the brake through a locking bolt, and torque is transmitted through friction of the end face of the brake disc and the end face of the brake.
Preferably, the through holes at the joints of the left and right driving wheel supports and the test bed in the embodiment are waist-hole type.
Preferably, the keys of the driving wheel and the driven wheel adopt a double-key structure in the embodiment; the arm braking disc and the brake disc adopt a double-key structure.
Preferably, the cylindrical gear pair test piece in the embodiment adopts a cylindrical straight gear pair or a cylindrical helical gear pair, and the tooth profile can be an involute gear, a parabolic gear, a circular arc and the like.
And the transmission error test bed selects a bearing meeting the requirements according to the cylindrical gear pair test piece.
The quasi-static transmission error test bed for the cylindrical gear pair is based on static loading, and the specific operation flow of the test loading is as follows:
1) rotating the test driving wheel to ensure that the meshing gear is the patch gear to be measured;
2) locking the brake and the locking bolt on the brake disc;
3) adjusting the loading force arm to be horizontal through a level meter, and locking the loading force arm and a locking bolt on a force arm brake disc;
4) and hooking the force arm on the loading force arm, and placing weights with certain mass according to the load required by the test. The test method comprises the following specific operation flows:
1) selecting test gear teeth of a driving wheel and a driven wheel, determining the position of a dangerous section of a tooth root by a tooth root dangerous section method, namely a 30-degree tangent method, and marking the position as a point a;
marking the middle position of the wheel rim of the selected testing gear teeth of the driving wheel and the driven wheel as a point b;
the position of the middle point of the wheel flange at the position of four gear teeth which are clockwise or anticlockwise away from the test gear tooth is marked as a point c;
2) and (3) polishing points a, b and c of the driving wheel and the driven wheel according to a strain gauge pasting pretreatment standard, and pasting the strain gauge according to a pasting standard.
3) Determining the load: determining the number and the mass of the weights to be selected, wherein the weights comprise weights with different masses and are hung on the force arm hook; and determining a loading distance, and mounting a moment arm hook at a corresponding position on a loading force.
In this embodiment, the method for obtaining quasi-Static Transmission Error (STE) of the cylindrical gear pair through test data processing includes:
in order to facilitate comparison with a theoretical calculation method, micro-displacement measurement of the driving wheel and the driven wheel at the meshing positions is carried out mainly aiming at 5 meshing positions of a meshing point (A), a double-single meshing area solution point (B), a node (C), a single-double meshing area demarcation point (D) and a meshing point (E) in the test.
According to the geometric relationship of the gear teeth, the micro-deformation of the wheel rim is established by utilizing the micro-change at the test point 2: epsilona＝2π×ε2In the formula, epsilon2To measure the amount of micro-deformation at 2.
The tooth micro-deformation calculation formula of different established loading points (taking the point A of engagement as an example) is as follows:
εb＝tan(ε1/rε1)×hAin the formula, epsilon1To measure the micro-variation value at 1; r isε1Radius for the measurement 1 position; h isAThe tooth height is measured from the meshing point to the 1 st position.
The total micro-deformation of the gear teeth (taking the point A of engagement as an example) is as follows: epsilonA＝2π×ε2+tan(ε1/rε1)×hA，
According to the definition of the quasi-static transmission error of the cylindrical gear pair, the quasi-static transmission error calculation formula (taking a meshing point A as an example) at each meshing point is obtained as follows: STEA＝δA is from-δA mainIn the formula, deltaA is fromThe micro-deformation of the driven wheel; deltaA mainThe micro-deformation of the driving wheel.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (8)
1. A cylindrical gear pair quasi-static transmission error test bed is characterized by comprising a loading assembly, a rotary locking assembly, a test bed supporting assembly, a driving axle assembly and a driven axle assembly;
the test bed supporting assembly is sequentially provided with the driving axle assembly and the driven axle assembly which are connected with each other; the loading assembly is arranged at a driving shaft end in the driving shaft assembly; the rotary locking assembly is mounted at a driven shaft end in the driven shaft assembly;
the loading assembly comprises a loading force arm, a force arm brake disc, weights, a force arm hook, a hook stop block and a locking bolt; the bottom of the force arm hook is used for placing the weight, and the top of the force arm hook is connected with a loading force arm; the hook stop block is positioned at the free end of the loading force arm and used for preventing the force arm hook from slipping out; the other end of the loading force arm is connected with a force arm brake disc; the moment arm brake disc is positioned on the test bed support assembly; the loading force arm and the force arm brake disc are locked through a locking bolt; the force arm brake disc is provided with a T-shaped groove along the circumferential direction; the head of the locking bolt is positioned in the T-shaped groove of the moment arm brake disc, and a screw rod of the locking bolt passes through a circumferential through hole of the moment arm brake disc through a sliding groove of the moment arm brake disc and is screwed into a matched nut; the moment arm brake disc is connected with the loading moment arm through a locking bolt, and torque is transmitted through friction between the end face of the moment arm brake disc and the end face of the loading moment arm.
2. The cylindrical gear pair quasi-static transfer error test bed of claim 1, wherein said rotational locking assembly comprises a brake, a brake disk, and a locking bolt for locking the brake and the brake disk; a T-shaped groove is formed in the brake disc; the brake is arranged on the brake disc; the brake disc is positioned on the test bed supporting component; the head of the locking bolt is positioned in the T-shaped groove of the brake disc, and a screw rod of the locking bolt passes through a circumferential through hole of the brake through a sliding groove of the brake disc and is screwed into a matched nut; the brake disc is connected with the brake through a locking bolt, and torque is transmitted through friction of the end face of the brake disc and the end face of the brake.
3. The cylindrical gear pair quasi-static transmission error test bed according to claim 2, wherein the test bed support assembly comprises a base, a driving shaft support part, a driving shaft support end cover, a driven shaft support part, a driven shaft support end cover, a driving wheel bearing end cover and a driven wheel bearing end cover, wherein two groups of driving shaft support parts, driving shaft support end covers and driven wheel bearing end covers are arranged on the base; the driving shaft supporting end cover is arranged at the top of the driving shaft supporting part, and the driving wheel bearing end cover is arranged at the outer sides of the driving shaft supporting end cover and the driving shaft supporting part; the driven shaft supporting end cover is arranged at the top of the driven shaft supporting part, and the driven wheel bearing end cover is arranged at the outer sides of the driven shaft supporting end cover and the driven shaft supporting part; the driving shaft supporting part and the driven shaft supporting part are sequentially distributed on the base; the driving wheel bearing end cover is used for connecting a driving wheel shaft assembly; and the driven wheel bearing end cover is used for connecting a driven wheel shaft assembly.
4. The quasi-static transmission error test bed of claim 3, wherein the base is provided with threaded holes for mounting the driving shaft supporting member and the driven shaft supporting member, respectively; the position of the threaded hole is determined according to the center distance of the test gear;
the driving shaft supporting end cover and the driving shaft supporting part, and the driven shaft supporting end cover and the driven shaft supporting part are connected through bolts; the driving wheel bearing end cover is connected with the driving shaft supporting end cover and the driving shaft supporting part through bolts; the driven wheel bearing end cover is connected with the driven shaft supporting end cover and the driven shaft supporting part through bolts; the base is also provided with a threaded hole for fixing the brake.
5. The cylindrical gear pair quasi-static transmission error test bed according to claim 4, wherein the driving wheel shaft assembly comprises a driving shaft, a bearing, a driving wheel key, a driving shaft sleeve, a bearing, a moment arm brake disc key, a moment arm brake disc and a driving shaft end stop cover which are sequentially arranged on the driving shaft; the shaft end baffle cover of the driving shaft is connected with the driving shaft through a bolt; the outer wall of the driving wheel key is provided with a driving wheel, and the driving wheel key is matched with the driving wheel; a loading force arm is arranged at the mounting position of the force arm brake disc key, and the force arm brake disc key is matched with the loading force arm;
the driven wheel shaft assembly comprises a driven shaft, a bearing, a driven wheel key, a driven shaft sleeve, a bearing, a brake disc key, a brake and a driven shaft end stop cover, wherein the bearing, the driven wheel key, the driven shaft sleeve, the bearing, the brake disc key, the brake and the driven shaft end stop cover are sequentially arranged on the driven shaft; the shaft end baffle cover of the driven shaft is connected with the driven shaft through a bolt; the driven wheel is arranged on the outer wall of the driven wheel key, and the driven wheel key is matched with the driven wheel; and a brake disc is arranged at the mounting position of the brake disc key, and the brake disc key is matched with the brake disc.
6. The quasi-static transmission error test bed of the cylindrical gear pair as claimed in claim 5, wherein the driving wheel key and the driven wheel key adopt a double-key structure; the arm braking disc and the brake disc adopt a double-key structure.
7. A testing method based on the cylindrical gear pair quasi-static transmission error test bed of claim 6 is characterized by comprising the following steps:
1) determining the position of the test cylindrical gear pair patch: selecting test gear teeth of a driving wheel and a driven wheel, determining the position of a dangerous section of a tooth root by a tooth root dangerous section method, namely a 30-degree tangent method, and marking the position as a point a; marking the middle position of the wheel rim of the test gear teeth of the selected driving wheel and the selected driven wheel as a point b; the position of the middle point of the wheel flange at the position of four gear teeth which are clockwise or anticlockwise away from the test gear tooth is marked as a point c; polishing points a, b and c of the driving wheel and the driven wheel according to a strain gauge pasting pretreatment standard, and pasting a strain gauge according to a pasting standard;
2) installing a test cylindrical gear pair, ensuring that meshing transmission gear teeth of the cylindrical gear pair are gear teeth which are adhered with strain gauges and the strain gauges bear loads, and respectively locking bolts in a loading assembly and a rotary locking assembly;
3) determining the load: determining the number and the mass of the weights to be selected, wherein the weights comprise weights with different masses and are hung on the force arm hook; and determining a loading distance, and mounting a moment arm hook at a corresponding position on a loading force.
8. A data processing method of a testing method of a cylindrical gear pair quasi-static transmission error test bed according to claim 7 is characterized by comprising the following steps:
a) according to the geometrical relationship of the gear, the strain change at the test point b is utilized to establish a micro-deformation calculation formula epsilon of the wheel rima＝2π×ε2In the formula, epsilon2Measuring the micro deformation at the position b;
b) establishing a gear tooth micro-deformation calculation formula at the test point a when the loading point is positioned at the engagement point A: epsilonb＝tan(ε1/rε1)×hAIn the formula, epsilon1To measure the micro-variation value at a;
radius for measuring position a; h isAMeasuring the tooth height of the position a for the distance between the meshing points;
c) fitting the gear tooth micro-deformation at the points a and b along the direction of the meshing line according to the definition of quasi-static transfer error, wherein the total micro-deformation at the gear tooth meshing point A is epsilonA＝2π×ε2+tan(ε1/rε1)×hA；
d) Respectively establishing total micro-deformation when the loading points are positioned at a double-single meshing area demarcation point B, a node C, a single-double meshing area demarcation point D and a meshing point E by adopting the same method of the steps B) and C);
subtracting the micro-deformation of the driving wheel after fitting from the displacement of the driven wheel to obtain the quasi-static transmission error of the cylindrical gear pair, STEA＝δA is from-δA mainIn the formula, deltaA is fromIs a slaveA micro-deformation amount is formed at a wheel meshing point A; deltaA mainThe micro-deformation amount at the meshing point A of the driving wheel;
similarly, quasi-static transmission errors of a double-single meshing area demarcation point B, a node C, a single-double meshing area demarcation point D and a meshing point E can be obtained, and the quasi-static transmission error of the meshing transmission of the cylindrical gear pair is obtained.
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| CN110261027B (en) * | 2019-07-25 | 2020-12-08 | 洛阳理工学院 | Key connection force detection experiment system |
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Application publication date: 20181116 Assignee: NANJING HIGH-SPEED & ACCURATE GEAR GROUP Co.,Ltd. Assignor: Nanjing University of Aeronautics and Astronautics Contract record no.: X2023980033795 Denomination of invention: Quasi-static transmission error test bench, testing and data processing method for cylindrical gear pairs Granted publication date: 20200424 License type: Exclusive License Record date: 20230317 |
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