CN107621215B - Pin shaft fillet measuring method and measuring instrument adopting same - Google Patents
Pin shaft fillet measuring method and measuring instrument adopting same Download PDFInfo
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- CN107621215B CN107621215B CN201710916424.6A CN201710916424A CN107621215B CN 107621215 B CN107621215 B CN 107621215B CN 201710916424 A CN201710916424 A CN 201710916424A CN 107621215 B CN107621215 B CN 107621215B
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000006073 displacement reaction Methods 0.000 claims abstract description 47
- 238000004513 sizing Methods 0.000 claims abstract description 30
- 238000006243 chemical reaction Methods 0.000 claims abstract description 10
- 238000005259 measurement Methods 0.000 claims description 11
- 238000003780 insertion Methods 0.000 claims description 7
- 230000037431 insertion Effects 0.000 claims description 7
- 238000000691 measurement method Methods 0.000 claims description 7
- 238000002788 crimping Methods 0.000 claims description 4
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 2
- 238000013461 design Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
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- A Measuring Device Byusing Mechanical Method (AREA)
Abstract
The invention discloses a round pin shaft fillet measuring method and a measuring instrument adopting the method, a measuring tool with a sizing hole is adopted, the aperture of the sizing hole is used for a round pin shaft tip to be measured to extend into and be in interference fit with a shaft body of the round pin shaft to be measured, the round pin shaft value is obtained by measuring the displacement of the round pin shaft tip to be measured extending into the sizing hole, and the displacement and the round pin shaft have a preset conversion relation. The pin roll fillet measuring instrument comprises a base, a gear system, a rack spring system, a hole gauge, a connector and a displacement measuring device. The round pin axle fillet can be measured rapidly and accurately through the measuring method and the measuring instrument.
Description
Technical Field
The invention relates to the technical field of contact measurement, in particular to a pin roll fillet measuring method and a measuring instrument adopting the same.
Background
In the mechanical industry, shaft hole interference fit is widely used, and a reasonable R angle (namely a round pin angle mentioned herein) of a pin shaft is generally required in the design of an interference fit structure. In actual production, whether the R angle of the pin shaft is qualified in the assembly process directly influences the difficulty degree and the assembly quality of assembly, and a measuring tool for quickly judging whether the R angle of the pin shaft meets the design requirement at present is mainly a vernier caliper and an R gauge. The vernier caliper can measure the maximum and minimum diameters of the R angle of the pin shaft, and the measuring precision is not high because of too large personnel influence factors; the R gauge based on the R angle profile can judge whether the R angle of the pin shaft meets the design requirement or not, but the actual value of the R angle cannot be accurately measured.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a pin roll fillet measuring method and a measuring instrument adopting the method, and the pin roll fillet can be measured rapidly and accurately by the measuring method and the measuring instrument.
The invention solves the technical problems through the following technical proposal.
The round pin axle fillet measuring method adopts a measuring tool with a sizing hole, the aperture of the sizing hole is used for the round pin axle head of the to-be-measured pin axle to stretch into and be in interference fit with the axle body of the to-be-measured pin axle, the numerical value of the round angle is obtained by measuring the displacement of the round pin axle head of the to-be-measured pin axle stretching into the sizing hole, and the displacement and the round angle have a preset conversion relation.
The measuring method combines the advantages of the vernier caliper and the R gauge, realizes quick measurement and can obtain accurate measurement values.
The utility model provides a round pin axle fillet measuring apparatu, includes base, gear system, rack spring system, hole rule, connector and displacement measuring device, gear system with the hole rule location is installed on the base, rack spring system with gear system passes through the cooperation of gear rack meshing transmission and forms the linear displacement of rack, the connector with the rack is joined in marriage and is kept synchronous displacement, the connector be equipped with the round pin axle matched with that awaits measuring, the hole rule be equipped with supply the round pin axle button head that awaits measuring stretches into and with the sizing hole of round pin axle body interference fit that awaits measuring, the rack spring system is for the connector provides spring pretension force makes the crimping head passes under non-measurement state sizing hole keeps the location, when measuring the fillet, the round pin axle button head that awaits measuring bulldozes the crimping head makes the round pin axle button head that awaits measuring stretches into the sizing hole, through displacement measuring device measures the linear displacement of rack and obtain fillet numerical value through the conversion relation of predetermined linear displacement and fillet.
Preferably, the hole gauge is provided with a stepped hole, the stepped hole comprises an insertion hole and a sizing hole, and the insertion hole is in clearance fit with the shaft body of the pin shaft to be measured.
Preferably, the base is provided with a guide groove for mating with the connector.
Preferably, the connector is a three-section step shaft, the left Duan Zhou section shaft is connected with the rack, the shaft diameter of the middle section shaft is larger than the aperture of the sizing hole, and in a non-measurement state, the left shoulder of the middle section shaft is positioned and abutted to the end face of the hole gauge, which is positioned at the same side of the sizing hole, by the aid of the spring pretightening force provided by the pretightening spring.
Preferably, the right section shaft is in threaded connection with the rack.
Preferably, the hole gauge is assembled by two split components.
Preferably, the displacement measuring device is a pointer compass for measuring angular displacement, the gear train is equipped with the pointer compass, and the linear displacement of the rack is obtained by obtaining the pointer compass reading through a predetermined conversion relation.
In summary, the pin fillet measuring instrument adopts a contact type measuring design, can amplify tiny rack linear displacement into compass pointer reading which can be easily obtained through a gear system, overcomes the defects of inaccurate measurement of a common vernier caliper and an R gauge and the like, can accurately measure the fillet size of a pin, and is beneficial to improving the assembly quality of shaft hole interference fit in the mechanical industry.
Drawings
The drawings described in connection with the preferred embodiments are intended to be illustrative of the embodiments and are not to be construed as limiting the scope of the invention.
FIG. 1 is a schematic diagram of a pin roll angle measurement method of the present invention;
FIG. 2 is a schematic diagram of an embodiment of the pin fillet gauge of the present invention;
fig. 3 is a partially enlarged schematic structural view at a in fig. 2.
In the figure: 1-base, 2-gear system, 3-rack spring system, 4-hole gauge, 5-connector, 6-pin shaft to be measured, 7-roller.
Detailed Description
For the convenience of understanding the present invention, the present invention will be described in detail with reference to preferred embodiments thereof as shown in the accompanying drawings.
As shown in the schematic diagram of the embodiment of the pin roll fillet measuring method of the present invention in fig. 1, the measuring tool with the sizing hole is a roller 7 with a fixed inner diameter, the shaft body of the pin roll 6 to be measured forms interference fit with the roller 7, the contour of the round head at the left side of the pin roll 6 to be measured contacts with the edge line of the inner hole at the right side of the roller 7, the distance from the end surface of the round head at the left side of the pin roll 6 to be measured to the end surface at the left side of the roller 7 changes as displacement between L1 and L2 based on the difference of the round head of the pin roll 6 to be measured (i.e. the R angle mentioned herein), and the displacement and the round head have a predetermined conversion relation (this operation relation can be set through a pre-operation), so that the size of the round head (R angle) of the measuring pin roll can be converted into a value for measuring the displacement.
The pin fillet measuring instrument in the embodiment of the invention shown in fig. 2 comprises a base 1, a gear system 2, a rack spring system 3, a hole gauge 4, a connector 5 and a displacement measuring device.
The gear system 2 and the hole gauge 4 are positioned and arranged on the base 1, the gear system 2 and the base 1 are connected in a plurality of modes, and all design schemes with the same or similar functions are within the protection scope of the invention. The rack spring system 3 and the gear system 2 are engaged and driven through a gear and a rack to form linear displacement of the rack, and the gear system 2 and the rack spring system 3 have various different structural designs, and all design schemes with the same or similar functions are also within the protection scope of the invention.
The measuring function achieved by the gauge 4 is the same as the measuring principle of the roller 7. The hole gauge 4 is provided with a sizing hole for the round head of the pin shaft 6 to be measured to extend into and be in interference fit with the shaft body of the pin shaft 6 to be measured.
The connector 5 is assembled with the rack and keeps synchronous displacement, a guide groove matched with the connector 5 can be arranged on the base 1, accurate directional displacement of the connector 5 is assisted, and the connector 5 is provided with a pressing joint matched with the pin shaft 6 to be tested. The rack spring system 3 provides a spring pre-tightening force for the connector 5 through a pre-tightening spring so that the compression joint passes through the sizing hole and keeps positioned in a non-measuring state.
When measuring the fillet, the round head of the pin shaft 6 to be measured pushes the pressure joint and enables the round head of the pin shaft 6 to be measured to extend into the sizing hole, the linear displacement of the rack is measured through the displacement measuring device, and the numerical value of the fillet is obtained through the conversion relation between the preset linear displacement and the fillet.
The displacement measuring device may be a pointer compass for measuring angular displacement, and the gear system 2 is equipped with the pointer compass, and obtains the linear displacement of the rack through obtaining the pointer compass reading and obtaining the linear displacement through a predetermined conversion relation. For example, since a small displacement of the rack may be transmitted into the gear system 2, the multi-stage gears in the gear system 2 may amplify the small linear displacement of the rack to a rotation angle (number of rotations) of the terminal gear, and the pointer compass reading has a certain mathematical relationship with the rack displacement. It is also within the scope of the invention if the amplified measurement of the small linear displacement of the rack is replaced with a high-precision displacement sensor.
As shown in fig. 3, the hole gauge 4 in this embodiment is provided with a stepped hole, the stepped hole includes an insertion hole and a sizing hole, and the insertion hole and the shaft body of the pin shaft 6 to be measured are in clearance fit, which not only plays a role in preventing errors in the type of the pin shaft to be measured, but also ensures that the pin shaft 6 to be measured is inserted smoothly, and improves measurement accuracy. Under the condition that the machining process cannot be met, the hole gauge 4 can be arranged into two split components so as to reduce the machining difficulty, and then the coaxiality requirement is ensured through the assembly process.
In one embodiment of the connector 5 shown in fig. 2, the connector 5 is a three-stage stepped shaft, the left Duan Zhou constitutes the press-fit joint, the right-stage shaft is connected with the rack, and the right-stage shaft and the rack may be screwed, or may be replaced by an interference fit, etc. and are all within the scope of the present invention. The diameter of the middle section shaft is larger than the diameter of the sizing hole, and in a non-measurement state, the left shoulder of the middle section shaft is positioned and abutted with the end face of the hole gauge 4, which is positioned on the same side of the sizing hole, by the aid of the spring pretightening force provided by the pretightening spring.
More specifically, referring to fig. 2, the shaft diameter of the middle shaft is far greater than the aperture of the sizing hole on the right side of the hole gauge 4, the pre-tightening spring in the rack spring system 3 maintains a normal leftward spring force on the connector 5, under the condition that no pin 6 to be measured is inserted, the left shoulder of the connector 5 is tightly positioned and attached to the right end surface of the hole gauge 4 under the action of spring force, the pin 6 to be measured is inserted into the insertion hole of the hole gauge 4 and forms rightward thrust on the connector 5, when the thrust is greater than the spring force, the connector 5 is displaced rightward until the R-angle contour of the pin 6 to be measured is in line contact with the left side of the sizing hole in the hole gauge 4, at this time, the pin 6 to be measured cannot be displaced rightward any more, the connector 5 is not displaced rightward any more, at this time, the compass pointer reading is read, and the R-angle is determined by the displacement value. As an example, a displacement versus R angle table can be seen as shown in the following table.
Attach table 1
The technical terms used in the present invention are merely for convenience of description and are not to be construed as limiting the present invention, and the present invention is not limited to the above-described preferred embodiments, but is intended to be included in the scope of protection of the present invention based on the known technology known to those skilled in the art or the embodiments using various modifications and alterations equivalent to the known technology in the art.
Claims (7)
1. A round pin shaft fillet measuring method is characterized by comprising the following steps: the method comprises the steps that a measuring tool with a sizing hole is adopted, the aperture of the sizing hole is used for enabling a round head of a pin shaft to be measured to extend into and be in interference fit with a shaft body of the pin shaft to be measured, a round angle numerical value is obtained by measuring the displacement of the round head of the pin shaft to be measured extending into the sizing hole, and the displacement and the round angle have a preset conversion relation;
The utility model provides a round pin axle fillet measuring apparatu, includes base, gear system, rack spring system, hole rule, connector and displacement measuring device, gear system with the hole rule location is installed on the base, rack spring system with gear system passes through the cooperation of gear rack meshing transmission and forms the linear displacement of rack, the connector with the rack is joined in marriage and is kept synchronous displacement, the connector be equipped with the round pin axle matched with that awaits measuring, the hole rule be equipped with supply the round pin axle button head that awaits measuring stretches into and with the sizing hole of round pin axle body interference fit that awaits measuring, the rack spring system is for the connector provides spring pretension force makes the crimping head passes under non-measurement state sizing hole keeps the location, when measuring the fillet, the round pin axle button head that awaits measuring bulldozes the crimping head makes the round pin axle button head that awaits measuring stretches into the sizing hole, through displacement measuring device measures the linear displacement of rack and obtain fillet numerical value through the conversion relation of predetermined linear displacement and fillet.
2. The pin fillet measurement method according to claim 1, wherein: the hole gauge is provided with a stepped hole, the stepped hole comprises an insertion hole and a sizing hole, and the insertion hole is in clearance fit with the shaft body of the pin shaft to be tested.
3. The pin fillet measurement method according to claim 2, characterized by: the base is provided with a guide groove matched with the connector.
4. The pin fillet measurement method according to claim 2, characterized by: the connector is a three-section step shaft, the left Duan Zhou is connected with the right section shaft and the rack, the shaft diameter of the middle section shaft is larger than the aperture of the sizing hole, and in a non-measurement state, the left shoulder of the middle section shaft is positioned and attached to the end face of the hole gauge, which is positioned at the same side of the sizing hole, by the aid of the spring pretightening force provided by the pretightening spring.
5. The pin fillet measurement method according to claim 4, wherein: the right section shaft is in threaded connection with the rack.
6. The pin fillet measurement method according to claim 2, characterized by: the hole gauge is formed by assembling two split components.
7. The pin fillet measurement method according to claim 2, characterized by: the displacement measuring device is a pointer compass for measuring angular displacement, the gear train is provided with the pointer compass, and the linear displacement of the gear rack is obtained by obtaining the readings of the pointer compass through a preset conversion relation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710916424.6A CN107621215B (en) | 2017-09-30 | 2017-09-30 | Pin shaft fillet measuring method and measuring instrument adopting same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710916424.6A CN107621215B (en) | 2017-09-30 | 2017-09-30 | Pin shaft fillet measuring method and measuring instrument adopting same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107621215A CN107621215A (en) | 2018-01-23 |
| CN107621215B true CN107621215B (en) | 2024-06-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710916424.6A Active CN107621215B (en) | 2017-09-30 | 2017-09-30 | Pin shaft fillet measuring method and measuring instrument adopting same |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2754058Y (en) * | 2004-11-10 | 2006-01-25 | 东风汽车有限公司 | Angle measuring device |
| CN101413777A (en) * | 2008-10-30 | 2009-04-22 | 洛阳轴研科技股份有限公司 | Method and apparatus for detecting miniature bearing ferrule 45 degrees inner chamfer angle rapidly and accurately |
| CN201765736U (en) * | 2010-03-04 | 2011-03-16 | 天津市天堰医教科技开发有限公司 | External chest compression depth detection structure |
| CN103353272A (en) * | 2013-06-14 | 2013-10-16 | 浙江万达汽车方向机有限公司 | Tool and method for measuring angle of relative position of bevel gear |
| KR101651504B1 (en) * | 2015-06-19 | 2016-08-29 | 윤흡 | measuring device radious of curvature and minor diameter of underground pipeline |
| CN206247984U (en) * | 2016-12-22 | 2017-06-13 | 东风(武汉)实业有限公司 | A kind of Automobile Parts Inspection device |
| CN207407791U (en) * | 2017-09-30 | 2018-05-25 | 杭州东华链条集团有限公司 | Pin shaft fillet measuring instrument |
-
2017
- 2017-09-30 CN CN201710916424.6A patent/CN107621215B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2754058Y (en) * | 2004-11-10 | 2006-01-25 | 东风汽车有限公司 | Angle measuring device |
| CN101413777A (en) * | 2008-10-30 | 2009-04-22 | 洛阳轴研科技股份有限公司 | Method and apparatus for detecting miniature bearing ferrule 45 degrees inner chamfer angle rapidly and accurately |
| CN201765736U (en) * | 2010-03-04 | 2011-03-16 | 天津市天堰医教科技开发有限公司 | External chest compression depth detection structure |
| CN103353272A (en) * | 2013-06-14 | 2013-10-16 | 浙江万达汽车方向机有限公司 | Tool and method for measuring angle of relative position of bevel gear |
| KR101651504B1 (en) * | 2015-06-19 | 2016-08-29 | 윤흡 | measuring device radious of curvature and minor diameter of underground pipeline |
| CN206247984U (en) * | 2016-12-22 | 2017-06-13 | 东风(武汉)实业有限公司 | A kind of Automobile Parts Inspection device |
| CN207407791U (en) * | 2017-09-30 | 2018-05-25 | 杭州东华链条集团有限公司 | Pin shaft fillet measuring instrument |
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| Publication number | Publication date |
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| CN107621215A (en) | 2018-01-23 |
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