CN114413722A - Device and method for measuring clearance between connecting rod and joint bearing and closing-up flattening clamp - Google Patents
Device and method for measuring clearance between connecting rod and joint bearing and closing-up flattening clamp Download PDFInfo
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- CN114413722A CN114413722A CN202111277345.8A CN202111277345A CN114413722A CN 114413722 A CN114413722 A CN 114413722A CN 202111277345 A CN202111277345 A CN 202111277345A CN 114413722 A CN114413722 A CN 114413722A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/14—Measuring arrangements characterised by the use of mechanical techniques for measuring distance or clearance between spaced objects or spaced apertures
- G01B5/146—Measuring arrangements characterised by the use of mechanical techniques for measuring distance or clearance between spaced objects or spaced apertures measuring play on bearings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B11/00—Work holders not covered by any preceding group in the subclass, e.g. magnetic work holders, vacuum work holders
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Abstract
The invention relates to a device and a method for measuring the clearance between a connecting rod and a joint bearing and a closing-up flattening clamp, wherein the device for measuring the clearance specifically comprises a base, a positioning pin and an elastic jacking piece, wherein the base is used for stabilizing a piece to be measured after closing-up treatment, a boss is arranged at the top of the base, and a pin hole which is through up and down is formed in the center of the base; the positioning pin is used for penetrating into an axis hole of a joint bearing of a piece to be measured for centering, and the lower end of the positioning pin extends into a pin hole of the base; the elastic jacking piece is arranged at the lower end of the positioning pin and jacks the joint bearing inner ring of the piece to be detected through the positioning pin. The utility model provides an utilize binding off clamp that flattens to close up link assembly, guarantee that binding face of binding off department's connecting rod and bearing inner race is seamless, utilize play measuring device to carry out the play measurement to the link assembly after closing up, the effectual part check-out time that has improved has reduced the production and processing cycle, guarantees the actual play of accurate measurement bearing inner race and outer lane, and measuring result is accurate, and measurement of efficiency is high.
Description
Technical Field
The invention belongs to the technical field of machining, and particularly relates to a device and a method for measuring clearance between a connecting rod and a joint bearing and a special closing-up flattening clamp thereof.
Background
The combination of the connecting rod and the joint bearing through a rolling method (figure 1) is a precise transmission assembly commonly used by some special instruments and equipment. A connecting rod hole in a general connecting rod and joint bearing assembly is 0.2mm thicker than a joint bearing, the thickness of the connecting rod hole is 5.5mm (navigation mark is 4.2mm) and 1.5mm thicker than the thickness of the joint bearing (thickness is 4mm), the bearing outer ring cannot be completely wrapped after closing-up extrusion deformation, and the joint bearing is easy to move. The technical requirement that the clearance between the inner ring and the outer ring of the bearing is not more than 0.1mm after the closing-in is difficult to guarantee.
In addition, the existing tool cannot meet the inspection requirements of combination and clearance not more than 0.1mm, and the quality of parts and the delivery period of products are seriously influenced.
Disclosure of Invention
In order to solve the defects existing in the prior art, the application provides a device for measuring the clearance of the connecting rod and the joint bearing, which can ensure that the actual clearance of the inner ring and the outer ring of the bearing can be accurately measured, effectively improves the detection time of the connecting rod assembly and shortens the production and processing period.
Meanwhile, the application also provides a measuring method of the clearance measuring device of the connecting rod and the joint bearing and a special measuring clamp, and the qualification rate of the connecting rod assembly is greatly improved.
The technical scheme adopted by the application is as follows:
a connecting rod and joint bearing play measuring device, comprising:
the base 7 is used for stabilizing the to-be-detected piece after the closing-up treatment, a boss 71 is arranged at the top of the base 7, and a pin hole 72 which is through up and down is formed in the center of the base 7; the piece to be detected is a connecting rod assembly;
the positioning pin 8 is used for penetrating into an axis hole of the joint bearing 2 of the piece to be measured for centering, and the lower end of the positioning pin 8 extends into a pin hole 72 of the base 7;
and the elastic jacking piece is arranged at the lower end of the positioning pin 8 and used for jacking the positioning pin 8 and jacking the inner ring of the joint bearing 2 of the to-be-tested piece through the positioning pin 8.
Further limiting, the positioning pin 8 is of a variable diameter structure and comprises an upper half positioning pin 8 and a lower half positioning pin 8, and the diameter of the upper half positioning pin 8 is matched with the axial center hole of the inner ring of the joint bearing 2 of the part to be measured; the lower half positioning pin 8 extends into the pin hole 72, and the diameter of the lower half positioning pin 8 is larger than that of the upper half positioning pin 8.
Further defined, the upper half positioning pin 8 extends out of the pin hole 72 of the base 7.
Further limit, the lower end of the positioning pin 8 is connected with the elastic jacking piece through a partition plate.
Further, the diameter of the partition plate is matched with the inner diameter of the pin hole 72 and can move in the pin hole 72 under the driving of the elastic jacking piece.
Further, the elastic jacking piece is a return spring 9 or a tension spring or a damping elastic piece.
A method for measuring the clearance between a connecting rod and a joint bearing is realized by the device for measuring the clearance between the connecting rod and the joint bearing, and comprises the following specific steps:
(1) placing the part to be tested after the closing-up treatment on a base 7, and penetrating a positioning pin 8 into an axial hole of a joint bearing 2 of the part to be tested for centering;
(2) the elastic jacking piece slowly jacks up the inner ring of the joint bearing 2 of the piece to be detected to the highest position by utilizing the elasticity of the elastic jacking piece, and the height of the inner ring is measured by a height ruler and adjusted to be 0;
(3) taking out the elastic jacking piece, enabling the inner ring of the joint bearing 2 to be at the lowest position by the self weight of the piece to be detected, and measuring and recording an actual value by using a height gauge;
(4) and (4) repeating the step (3), comparing the actual value obtained by repeated measurement with the actual value measured in the step (3), wherein the difference value of the actual value of the front and the actual value of the rear is the clearance value of the to-be-measured piece after the closing-up treatment.
Further limiting, the step (1) is specifically as follows:
(1.1) after the piece to be detected is assembled, coating lubricating oil on an annular groove 23 on the end face of a connecting rod 1 of the piece to be detected, placing the piece to be detected on a closing-in flattening clamp, pressing the connecting rod 1, closing up a first surface of the connecting rod 1 of the piece to be detected on a drilling machine, and then closing up a second surface of the connecting rod 1 of the piece to be detected according to the same operation;
(1.2) adjusting the pressure of the hydraulic press to 2.5-3MPa, mounting the piece to be detected on a base 7 of the closing-up flattening fixture, inserting a centering shaft 6, and installing a pressing sleeve 3 of the closing-up flattening fixture;
(1.3) pressing the connecting rod 1 by hand, starting a hydraulic press, flattening the closing mouths of the first surface and the second surface of the piece to be measured respectively by using a pressing sleeve 3, and tightly wrapping the outer ring of the joint bearing 2 of the piece to be measured;
(1.4) placing the piece to be tested processed in the step (1.3) on a boss 71 of a base 7;
(1.5) the lower half positioning pin 8 is arranged in a pin hole 72 of the base 7, and the upper half positioning pin 8 penetrates into a shaft center hole of the joint bearing 2 of the piece to be measured for centering.
A closing-in flattening clamp for a clearance measurement method of a connecting rod and a joint bearing comprises a clamp base 5, a pressing sleeve 3 and a centering shaft 6;
the clamp base 5 is used for placing the connecting rod assembly and comprises a bottom plate 4 and a base 5, the base 5 is arranged on the bottom plate 4, a boss 71 is arranged at the top of the base 5, and a centering groove 51 which is through up and down is formed in the center of a base 7;
the pressing sleeve 3 is arranged above the clamp base 5 and used for flattening the closing-up of the connecting rod 1 of the connecting rod assembly;
and the centering shaft 6 is arranged in a centering groove 51 hole of the clamp base 5, and the top end of the centering shaft penetrates through a shaft center hole of the connecting rod assembly and extends into the pressing sleeve 3, so that the pressing sleeve 3 is connected with the connecting rod assembly and the clamp base 5.
Further limiting, a pressure groove 31 is arranged in the middle of the pressure sleeve 3, an opening of the pressure groove 31 faces downwards to the knuckle bearing 2 of the connecting rod assembly, a shaft hole 32 is formed in the bottom of the pressure groove 31, and the inner diameter of the lower end of the pressure sleeve 3 is larger than the diameter of the port of the bearing inner ring 22 of the knuckle bearing 2; the outer diameter of the lower end of the pressing sleeve 3 is larger than the diameter of the bearing outer ring 21 of the joint bearing 2.
Further limiting, the outer wall of the lower end of the pressing sleeve 3 and the lower end surface form an arc transition, the radius of the arc is R2, and R2 is smaller than the wall thickness h of the pressing sleeve 3.
Further, the centering groove 51 of the clamp base 5 is formed by connecting the centering groove 51 and the centering hole 52 in a penetrating manner from top to bottom, the inner diameter of the centering groove 51 is larger than that of the centering hole 52, and the centering groove 51 is opposite to the connecting rod assembly.
The centering shaft 6 is in a T-shaped shaft structure, the diameter of the upper end of the centering shaft is larger than that of the lower end of the centering shaft, the lower end of the centering shaft extends into the centering hole 52 of the clamp base 5, and the upper end of the centering shaft is arranged in the centering groove 51 and extends into the shaft hole 32 of the pressing sleeve 3 through the shaft hole of the bearing inner ring 22 of the connecting rod assembly.
Compared with the prior art, the beneficial effects of this application are:
(1) the utility model provides an utilize binding off clamp that flattens to close up link assembly, it is tight with bearing inner race 21 parcel, guarantee that the binding face of the department connecting rod 1 of closing up and bearing inner race 21 is seamless, joint bearing 2 does not have the cluster and moves, has effectively solved connecting rod 1 and bearing and has produced the problem of reprocessing and scrapping of part because of the quality of closing up, has avoided two part binding faces to have the phenomenon that gap, parcel are not tight.
(2) The utility model provides an utilize play measuring device to carry out the play measurement to link assembly after binding off after the link assembly binding off, measuring method convenient and fast, the effectual part check-out time that has improved has reduced production process cycle, can guarantee measured stability and reliability moreover, guarantees the actual play of accurate measurement bearing inner race 22 and outer lane, and measuring result is accurate, and measurement of efficiency is high.
(3) This application has designed special binding off clamp and special trip clearance measuring device according to connecting rod and joint bearing assembly's structural particularity, when can promote measurement of efficiency greatly, can effectively avoid artificial interference, improves link assembly's qualification rate, guarantees part quality.
In order to verify that the binding off of this application flattens anchor clamps and carries out the effect of binding off to link assembly, contrast the effect of binding off effect and ordinary binding off of this application, the result is as follows:
can see through above-mentioned binding off effect comparison, this application closes up link assembly with binding off clamp that flattens, and is tight with bearing inner race parcel, joint bearing does not have the cluster and moves, and the product percent of pass can reach 100%.
Drawings
FIGS. 1 and 2 are schematic views of a conventional connecting rod assembly;
FIG. 3 is a schematic view of a connecting rod assembly closing in;
FIG. 4 is a schematic view of the post-closing press;
FIG. 5 is a schematic view of a play gauge;
in the figure:
1-connecting rod, 2-joint bearing, 21-bearing outer ring, 22-bearing inner ring, 23-ring groove, 3-pressing sleeve, 31-pressing groove, 32-shaft hole, 4-bottom plate, 5-base, 51-centering groove, 52-centering hole, 6-centering shaft, 7-base, 71-boss, 72-pin hole, 8-positioning pin and 9-spring.
Detailed Description
The technical solution of the present application will now be further explained with reference to the drawings and examples.
The technical scheme of the application mainly relates to the close-up and clearance measurement of the connecting rod and the joint bearing assembly (see fig. 2, also called connecting rod assembly), and the special clamp for the close-up is mainly used for carrying out close-up treatment on the connecting rod and the joint bearing assembly and further carrying out flattening treatment after the close-up, so that the connecting rod 1 wraps the bearing tightly, and the seamless joint surface is ensured. The clearance measurement relates to a special clearance measurement device and a measurement method, and mainly aims to detect that the clearance between the inner ring 22 and the outer ring of the closed bearing is not more than 0.1mm, so that the detection time of parts is effectively prolonged.
As shown in fig. 3, the special closing-in flattening clamp related in the method for measuring the clearance between the connecting rod and the knuckle bearing of the present application includes a clamp base 5, a pressing sleeve 3, and a centering shaft 6, see fig. 3 and 4.
The pressing sleeve 3, which can also be called a gland, is arranged above the clamp base 5 in a back-off manner and is used for flattening the closing-up of the connecting rod 1 of the connecting rod assembly; the middle part of the pressing sleeve 3 is provided with a pressing groove 31, the opening of the pressing groove 31 is downward opposite to the joint bearing 2 of the connecting rod assembly, and the bottom of the pressing groove 31 is provided with a shaft hole 32, so that the shaft hole 32 is communicated with the pressing groove 31 to form a T-shaped sinking groove structure. The pressing sleeve 3 corresponds to the centering groove 51 of the base 5 up and down, the inner diameter of the lower end of the pressing sleeve 3 is that the inner diameter of the pressing groove 31 is larger than the diameter of the port of the bearing inner ring 22 of the knuckle bearing 2, or is the same as the diameter of the cambered surface of the bearing inner ring 22 of the knuckle bearing 2, the outer diameter of the lower end of the pressing sleeve 3 is larger than the diameter of the bearing outer ring 21 of the knuckle bearing 2, namely the outer wall of the pressing sleeve 3 is the same as the upper and lower diameters of the outer wall of the base 5, and the lower part of the outer wall of the pressing sleeve 3 is opposite to the annular grooves on the upper and lower surfaces of the connecting rod 1 outside the bearing outer ring 21 of the knuckle bearing 2.
Further, in order to flatten the closing position of the connecting rod 1 and ensure the leveling effect, the lower end surface of the pressing sleeve 3 is set to be a plane, the outer wall of the lower end and the lower end surface form an arc transition, the radius of the arc is R2-1.5-2 mm, and R2 is smaller than the wall thickness h of the pressing sleeve 3.
And the centering shaft 6 is arranged in a centering groove 51 hole of the clamp base 5, the centering shaft 6 is of a T-shaped shaft structure, the diameter of the upper end of the centering shaft is larger than that of the lower end of the centering shaft, the lower end of the centering shaft extends into a centering hole 52 of the clamp base 5, the upper end of the centering shaft is arranged in the centering groove 51 and penetrates through a bearing inner ring 22 shaft center hole of the connecting rod assembly to extend into a shaft hole 32 of the pressing sleeve 3, and the pressing sleeve 3 is connected with the connecting rod assembly and the clamp base 5.
When the special closing-in flattening clamp is used for closing-in and flattening the connecting rod assembly, the specific method is as follows: according to the figure 2, the knuckle bearing 2 is arranged in the connecting rod 1, lubricating oil is coated on an annular groove 23 on the end face of the connecting rod 1, the connecting rod assembly is placed on a clamp base 5 of a closing-up flattening clamp, the connecting rod 1 is pressed, after the first face of the connecting rod 1 is closed up on a drilling machine, the second face of the connecting rod 1 of a piece to be detected is closed up according to the same operation; adjusting the pressure of the hydraulic press to 2.5-3MPa after the double-sided closing up is completed, keeping for 10 seconds, inserting the centering shaft 6, installing the pressing sleeve 3 of the closing-up flattening clamp, extending the upper end of the centering shaft 6 into the shaft hole 32 of the pressing sleeve 3, pressing the connecting rod 1 with a hand, starting the hydraulic press, flattening the closing-up positions of the first surface and the second surface of the workpiece to be detected respectively by using the pressing sleeve 3, tightly wrapping the outer ring of the joint bearing 2 of the connecting rod assembly, and completing the closing up and flattening of the connecting rod assembly.
The device for measuring the play between a connecting rod and a joint bearing of the present application, see fig. 5, comprises:
the base 7 is used for stabilizing a to-be-detected piece (namely, the connecting rod assembly) after the closing-up treatment, the to-be-detected piece is arranged on the measuring workbench, a boss 71 is arranged at the top of the base 7, and the peripheral diameter of the boss 71 is smaller than the outer diameter of the bearing outer ring 21 of the connecting rod assembly. A pin hole 72 which is through up and down is arranged in the center of the base 7;
the positioning pin 8 is used for penetrating into an axial hole of the joint bearing 2 of the piece to be measured for centering, and the lower end of the positioning pin 8 extends into a pin hole 72 of the base 7; the positioning pin 8 comprises an upper half positioning pin 8 and a lower half positioning pin 8, the upper half positioning pin 8 extends out of a pin hole 72 of the base 7, and the diameter of the upper half positioning pin 8 is matched with an inner ring axial center hole of the joint bearing 2 of the to-be-measured part; the lower half positioning pin 8 extends into the pin hole 72, and the diameter of the lower half positioning pin 8 is larger than that of the upper half positioning pin 8, so that the upper half positioning pin 8 and the lower half positioning pin 8 form a diameter-variable structure, and the lower end of the positioning pin 8 is connected with the elastic jacking piece through a partition plate.
The baffle is connected at the lower extreme of locating pin 8, is connected with elastic jacking piece through this baffle. The diameter of baffle and pinhole 72 internal diameter match and can move in pinhole 72 under the drive of elasticity jacking piece, guarantee that locating pin 8 does not block the position, and the slope does not can go up and down the linear motion.
And the elastic jacking piece is arranged at the lower end of the positioning pin 8 and used for jacking the positioning pin 8 and jacking the inner ring of the joint bearing 2 of the to-be-tested piece through the positioning pin 8. The elastic jacking piece can be a return spring 9 or a tension spring or a damping elastic piece.
The method for measuring the clearance between the connecting rod and the joint bearing comprises the following specific steps:
(1) placing the part to be tested after the closing-up treatment on a base 7, and penetrating a positioning pin 8 into an axial hole of a joint bearing 2 of the part to be tested for centering; the step (1) is specifically as follows:
(1.1) after the piece to be detected is assembled, coating lubricating oil on an annular groove 23 on the end face of a connecting rod 1 of the piece to be detected, placing the piece to be detected on a closing-in flattening clamp, pressing the connecting rod 1, closing up a first surface of the connecting rod 1 of the piece to be detected on a drilling machine, and then closing up a second surface of the connecting rod 1 of the piece to be detected according to the same operation;
(1.2) adjusting the pressure of the hydraulic press to 2.5-3MPa, mounting the piece to be detected on a base 7 of the closing-up flattening fixture, inserting a centering shaft 6, and installing a pressing sleeve 3 of the closing-up flattening fixture;
(1.3) pressing the connecting rod 1 by hand, starting a hydraulic press, flattening the closing mouths of the first surface and the second surface of the piece to be measured respectively by using a pressing sleeve 3, and tightly wrapping the outer ring of the joint bearing 2 of the piece to be measured;
(1.4) placing the piece to be tested processed in the step (1.3) on a boss 71 of a base 7;
(1.5) the lower half positioning pin 8 is arranged in a pin hole 72 of the base 7, and the upper half positioning pin 8 penetrates into a shaft center hole of the joint bearing 2 of the piece to be measured for centering.
(2) The elastic jacking piece slowly jacks up the inner ring of the joint bearing 2 of the piece to be detected to the highest position by utilizing the elasticity of the elastic jacking piece, and the height of the inner ring is measured by a height ruler and adjusted to be 0;
(3) taking out the elastic jacking piece, enabling the inner ring of the joint bearing 2 to be at the lowest position by the self weight of the piece to be detected, and measuring and recording an actual value by using a height gauge;
(4) and (4) repeating the step (3), comparing the actual value obtained by repeated measurement with the actual value measured in the step (3), wherein the difference value of the actual value of the front and the actual value of the rear is the clearance value of the to-be-measured piece after the closing-up treatment.
The following specific examples will now be described.
Example 1
This embodiment will be described by taking a connecting rod and joint bearing assembly of the type having a measured wall thickness of 5.5mm as an example.
The utility model provides a connecting rod and joint bearing's play measuring device, with base 7 fixed mounting on the measurement workbench, the top of base 7 sets up the high boss 71 of 2mm, and the periphery diameter 12mm of boss 71 is less than the 21 external diameters of bearing inner race of link assembly. The piece to be measured, namely the connecting rod assembly is fixed on the boss 71 of the base 7, and the positioning pin 8 penetrates through the shaft center hole of the joint bearing 2 of the piece to be measured to be centered. The positioning pin 8 comprises an upper half positioning pin 8 and a lower half positioning pin 8, the upper half positioning pin 8 is 9mm in height and 6mm in diameter and extends into an axis hole of the inner ring of the joint bearing 2 of the part to be measured; the lower half positioning pin 8 extends into a pin hole 72 of the base 7, the diameter of the lower half positioning pin 8 is 10mm, the height of the lower half positioning pin 8 is 9mm, the upper half positioning pin 8 and the lower half positioning pin 8 form a reducing structure, the lower end of the inner ring of the joint bearing 2 is guaranteed to be just fixed on the upper end face of the lower half positioning pin 8 after centering, positioning accuracy is guaranteed, and the consistency of a measuring result is guaranteed. The lower end face of the lower half positioning pin 8 is connected with the spring 9 through the partition plate, the spring 9 can be in a specification of 0.8 multiplied by 10 multiplied by 42mm, the positioning pin 8 is jacked by utilizing the elasticity of the spring 9, the bearing inner ring 22 is jacked to the highest position slowly, and the zero point of measurement is determined. The diameter of the partition plate is matched with the inner diameter of the pin hole 72, and the partition plate can be driven by the spring 9 to move linearly in the pin hole 72, so that the positioning pin 8 is not clamped and inclined, and can move linearly up and down.
Example 2
This embodiment is described by taking the example of measuring a 5.5mm type connecting rod and knuckle bearing assembly.
The utility model provides a connecting rod and joint bearing's play measuring device, with base 7 fixed mounting on the measurement workbench, the top of base 7 sets up the high boss 71 of 2mm, and the periphery diameter 12mm of boss 71 is less than the 21 external diameters of bearing inner race of link assembly. The piece to be measured, namely the connecting rod assembly is fixed on the boss 71 of the base 7, and the positioning pin 8 penetrates through the shaft center hole of the joint bearing 2 of the piece to be measured to be centered. The positioning pin 8 comprises an upper half positioning pin 8 and a lower half positioning pin 8, the upper half positioning pin 8 is 9mm in height and 6mm in diameter and extends into an axis hole of the inner ring of the joint bearing 2 of the part to be measured; the lower half positioning pin 8 extends into a pin hole 72 of the base 7, the diameter of the lower half positioning pin 8 is 10mm, the height of the lower half positioning pin 8 is 9mm, the upper half positioning pin 8 and the lower half positioning pin 8 form a reducing structure, the lower end of the inner ring of the joint bearing 2 is guaranteed to be just fixed on the upper end face of the lower half positioning pin 8 after centering, positioning accuracy is guaranteed, and the consistency of a measuring result is guaranteed. The lower end face of the lower half positioning pin 8 is connected with the spring 9 through the partition plate, the positioning pin 8 is jacked by the aid of elasticity of the spring 9, the bearing inner ring 22 is jacked to the highest position slowly, and a measured zero point is determined.
Through the clearance measuring device cooperation clearance measuring method of connecting rod and joint bearing and dedicated binding off flattening anchor clamps of this application can the bearing inner race 21 parcel tight, guarantee that the binding face is seamless, guarantee product quality, the supplementary efficiency of play measurement that has promoted, the clearance of bearing inner race 22 and outer lane is not more than 0.1mm, satisfy standard requirement, effectively improved part detection efficiency, can reduce the clearance measuring time to 1min by original 5min, the clearance measuring time has been shortened greatly, the production and processing cycle has been reduced.
Claims (10)
1. A connecting rod and joint bearing's play measuring device characterized in that includes:
the base (7) is used for stabilizing the to-be-detected piece after the closing-up treatment, a boss (71) is arranged at the top of the base (7), and a pin hole (72) which is vertically communicated is formed in the center of the base (7); the piece to be detected is a connecting rod assembly;
the positioning pin (8) is used for penetrating into an axial hole of the joint bearing (2) of the piece to be measured for centering, and the lower end of the positioning pin (8) extends into a pin hole (72) of the base (7);
the elastic jacking piece is arranged at the lower end of the positioning pin (8) and used for jacking the positioning pin (8) and jacking the inner ring of the joint shaft (2) of the piece to be detected through the positioning pin (8).
2. The connecting rod and joint bearing play measuring device according to claim 1, wherein the locating pin (8) is of a reducing structure and comprises an upper half locating pin (8) and a lower half locating pin (8), and the diameter of the upper half locating pin (8) is matched with the axle center hole of the inner ring of the joint bearing (2) of the piece to be measured; the lower half positioning pin (8) extends into the pin hole (72), and the diameter of the lower half positioning pin (8) is larger than that of the upper half positioning pin (8).
3. Connecting rod and spherical plain bearing play measuring device according to claim 2, characterized in that the upper locating pin half (8) extends out of the pin hole (72) of the base (7).
4. The device for measuring the clearance between a connecting rod and a joint bearing according to any one of claims 1 to 3, characterized in that the lower end of the positioning pin (8) is connected with the elastic jacking piece through a partition plate; the diameter of the partition plate is matched with the inner diameter of the pin hole (72) and can move in the pin hole (72) under the driving of the elastic jacking piece; the elastic jacking piece is a return spring (9) or a tension spring or a damping elastic piece.
5. A method for measuring the play between a connecting rod and a joint bearing is characterized by being realized by the device for measuring the play between the connecting rod and the joint bearing according to claim 1, and comprising the following specific steps of:
(1) placing the part to be tested after the closing-up treatment on a base (7), and penetrating a positioning pin (8) into an axis hole of a joint bearing (2) of the part to be tested for centering;
(2) the elastic jacking piece slowly jacks up the inner ring of the joint bearing (2) of the piece to be detected to the highest position by utilizing the elasticity of the elastic jacking piece, and the height of the inner ring is measured by a height gauge and adjusted to be 0%;
(3) taking out the elastic jacking piece, enabling the inner ring of the joint bearing (2) to be at the lowest position by the piece to be detected through self weight, and measuring and recording an actual value by using a height gauge;
(4) and (4) repeating the step (3), comparing the actual value obtained by repeated measurement with the actual value measured in the step (3), and obtaining the difference value of the actual value of the previous and the next actual values, namely the clearance value of the to-be-measured piece after the closing-up treatment.
6. The connecting rod and spherical plain bearing play measuring method according to claim 5, characterized in that said step (1) is in particular:
(1.1) after the piece to be detected is assembled, coating lubricating oil on an annular groove (23) on the end face of a connecting rod (1) of the piece to be detected, placing the piece to be detected on a closing flattening clamp, pressing the connecting rod (1), closing up a first surface of the connecting rod (1) of the piece to be detected on a drilling machine, and then closing up a second surface of the connecting rod (1) of the piece to be detected according to the same operation;
(1.2) adjusting the pressure of the hydraulic press to 2.5-3MPa, mounting the piece to be tested on a base (7) of the closing-up flattening fixture, inserting a centering shaft (6), and mounting a pressing sleeve (3) of the closing-up flattening fixture;
(1.3) pressing the connecting rod (1) by hand, starting the hydraulic press, flattening the closing mouths of the first surface and the second surface of the piece to be measured respectively by using a pressing sleeve (3), and tightly wrapping the outer ring of the joint bearing (2) of the piece to be measured;
(1.4) placing the piece to be detected processed in the step (1.3) on a boss (71) of a base (7);
(1.5) installing a lower half positioning pin (8) in a pin hole (72) of a base (7), and penetrating an upper half positioning pin (8) into an axle center hole of a joint bearing (2) of a piece to be measured for centering.
7. A closing-in flattening clamp for the connecting rod and joint bearing clearance measuring method according to claim 5, characterized in that the clamp comprises a clamp base (5), a pressing sleeve (3) and a centering shaft (9);
the clamp base (5) is used for placing the connecting rod assembly and comprises a bottom plate (4) and a base (5), the base is arranged on the bottom plate (4), a boss (71) is arranged at the top of the base (5), and a centering groove (51) hole which is communicated up and down is formed in the center of a base (7);
the pressing sleeve (3) is arranged above the clamp base (5) and is used for flattening the closing-up of the connecting rod (1) of the connecting rod assembly;
and the centering shaft (6) is arranged in a centering groove (51) hole of the clamp base (5), and the top end of the centering shaft penetrates through a shaft center hole of the connecting rod assembly and extends into the pressing sleeve (3), so that the pressing sleeve (3) is connected with the connecting rod assembly and the clamp base (5).
8. The closing-in flattening clamp for the clearance measurement method of the connecting rod and the knuckle bearing according to claim 7, characterized in that a pressing groove (31) is arranged in the middle of the pressing sleeve 3, an opening of the pressing groove (31) faces downwards to the knuckle bearing (2) of the connecting rod assembly, a shaft hole (32) is formed in the bottom of the pressing groove (31), and the inner diameter of the lower end of the pressing sleeve (3) is larger than the diameter of the port of the bearing inner ring (22) of the knuckle bearing (2); the outer diameter of the lower end of the pressing sleeve (3) is larger than the diameter of a bearing outer ring (21) of the joint bearing (2).
9. The closing-in flattening clamp for the connecting rod and knuckle bearing clearance measuring method according to claim 8, characterized in that the outer wall of the lower end of the pressing sleeve (3) and the lower end surface form a circular arc transition, the radius of the circular arc is R2, and R2 is smaller than the wall thickness h of the pressing sleeve (3).
10. The closing-in flattening clamp for the clearance measurement method of the connecting rod and the joint bearing according to claim 9, characterized in that the hole of the centering groove (51) of the clamp base (5) is formed by connecting the centering groove (51) and the centering hole (52) from top to bottom, the inner diameter of the centering groove (51) is larger than that of the centering hole (52), and the centering groove (51) is opposite to the connecting rod assembly; the centering shaft (6) is of a T-shaped shaft structure, the diameter of the upper end of the centering shaft is larger than that of the lower end of the centering shaft, the lower end of the centering shaft extends into a centering hole (52) of the clamp base (5), and the upper end of the centering shaft is arranged in a centering groove (51) and penetrates through a shaft hole of a bearing inner ring (22) of the connecting rod assembly to extend into a shaft hole (32) of the pressing sleeve (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111277345.8A CN114413722A (en) | 2021-10-29 | 2021-10-29 | Device and method for measuring clearance between connecting rod and joint bearing and closing-up flattening clamp |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111277345.8A CN114413722A (en) | 2021-10-29 | 2021-10-29 | Device and method for measuring clearance between connecting rod and joint bearing and closing-up flattening clamp |
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| Publication Number | Publication Date |
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| CN114413722A true CN114413722A (en) | 2022-04-29 |
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| CN202111277345.8A Pending CN114413722A (en) | 2021-10-29 | 2021-10-29 | Device and method for measuring clearance between connecting rod and joint bearing and closing-up flattening clamp |
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| CN207036017U (en) * | 2017-07-06 | 2018-02-23 | 中国人民解放军第五七二一工厂 | A kind of oscillating bearing radial clearance measurement apparatus |
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| CN212674026U (en) * | 2020-07-06 | 2021-03-09 | 亚洲硅业(青海)股份有限公司 | Detection device for detecting axial clearance of bearing |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102175204A (en) * | 2010-12-24 | 2011-09-07 | 燕山大学 | Device for detecting axial clearance and radial clearance of joint bearing |
| CN206399400U (en) * | 2016-12-12 | 2017-08-11 | 中机洛阳精密装备科技股份有限公司 | A kind of double semi outer rings crossed roller bearing, four-point contact ball end-play detection means |
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