CN110614497A - Automatic press fitting and pressing depth measuring device for valve oil seal - Google Patents
Automatic press fitting and pressing depth measuring device for valve oil seal Download PDFInfo
- Publication number
- CN110614497A CN110614497A CN201910882089.1A CN201910882089A CN110614497A CN 110614497 A CN110614497 A CN 110614497A CN 201910882089 A CN201910882089 A CN 201910882089A CN 110614497 A CN110614497 A CN 110614497A
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- valve oil
- oil seal
- shaft
- press
- probe
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- 238000003825 pressing Methods 0.000 title description 12
- 239000000523 sample Substances 0.000 claims abstract description 52
- 238000012544 monitoring process Methods 0.000 claims abstract description 8
- 238000009530 blood pressure measurement Methods 0.000 claims abstract description 4
- 239000013307 optical fiber Substances 0.000 claims description 11
- 238000006073 displacement reaction Methods 0.000 claims description 8
- 238000007373 indentation Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 5
- 238000001514 detection method Methods 0.000 abstract description 3
- 230000000903 blocking effect Effects 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 62
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
- B23P19/02—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for connecting objects by press fit or for detaching same
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/18—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring depth
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention discloses an automatic press-fitting and press-in depth measuring device for a valve oil seal, which comprises a seat, wherein a first shaft is embedded in the seat, a blocking connecting block is arranged at the top of the first shaft, the bottom of the first shaft extends out of the seat, a first spring is sleeved on the first shaft extending out of the seat, a pressure head arranged on the same axis is arranged below the first shaft, the valve oil seal is arranged at the bottom of the pressure head, a probe capable of moving up and down is arranged in the pressure head, the upper end of the probe is arranged in the pressure head, the lower end of the probe extends out of the bottom of the pressure head, a clamp connecting block is connected onto the probe, one end of the clamp connecting block is fixedly connected with the probe in the pressure head, the other end of the clamp connecting block. The invention can realize the detection of the presence or absence of the valve oil seal self-tightening spring, the press mounting of the valve oil seal, the pressure measurement and the press-in depth measurement, and is respectively used for monitoring the pressure and the press-in depth of the valve oil seal assembly and detecting the presence or absence of the self-tightening spring of the valve oil seal.
Description
Technical Field
The invention relates to the technical field of testing of automatic press-fitting devices for valve oil seals, in particular to an automatic press-fitting and pressing-in depth measuring device for a valve oil seal.
Background
The valve oil seal is one of the important parts of the engine valve group and is used for preventing engine oil from entering a combustion chamber. The automatic assembly of the valve oil seal is described in patents CN201720857374 (a new type of valve oil seal press head), CN201410384584 (valve oil seal press fitting tool), CN201811087137 (valve oil seal press head device) and CN201820335228 (valve oil seal press fitting mechanism), and the measurement of the press-in depth is also described in patent CN201220499736 (tool for measuring the press-fitting height of the valve oil seal).
In the production process, the monitoring of the assembling pressure and the pressing-in depth of the valve oil seal can reduce the flow of unqualified products into the subsequent process, greatly reduce the production cost and improve the production efficiency, and the pressure mounting and the measurement of the valve oil seal are not integrated in the prior art, so that the monitoring requirements of customers on the assembling pressure and the pressing-in depth of the valve oil seal can not be met.
Disclosure of Invention
The invention aims to solve the problems of monitoring the assembling pressure and the pressing depth of the valve oil seal and the requirement on detecting whether a self-tightening spring of the valve oil seal exists or not.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides an automatic pressure equipment of valve oil blanket and degree of depth measuring device that impresses, includes the seat, the embedded axle that is equipped with of seat, the top of axle are equipped with and keep off the connecting block, and the bottom of axle extends to outside the seat, it is equipped with first spring to extend to epaxial cover outside the seat, the below of axle is equipped with the pressure head that same axis set up, the bottom of pressure head is equipped with the valve oil blanket, be equipped with the probe that can reciprocate in the pressure head, establish in the pressure head in the upper end of probe, the lower extreme of probe extends to outside the bottom of pressure head, be connected with on the probe and press from both sides the connecting block, press from both sides connecting block one end and pressure head internal probe fixed connection, the other one end of pressing from both sides the connecting block is established outside the pressure.
Preferably, a second shaft is arranged above the probe, and a pressure sensor is arranged above the second shaft.
Preferably, a shaft sleeve is arranged between the first shaft and the pressure head, the upper end of the shaft sleeve is connected with the first shaft through a connecting block, the pressure head is connected with the lower end of the shaft sleeve, and the pressure sensor is arranged between the shaft sleeve and the connecting block.
Preferably, the pressure sensor and the connecting block are sealed through an O-shaped ring.
Preferably, the second shaft is connected with the probe moving up and down through a second spring, the bottom end of the second spring is sleeved outside the top of the probe, and the top end of the second spring is sleeved outside the bottom of the second shaft.
Preferably, an optical fiber sensor is arranged on the pressure head, and the optical fiber sensor is mounted on the pressure head through a sensor bracket.
Preferably, the shaft is provided with a limiting rod, one end of the limiting rod is positioned in the shaft, and the other end of the limiting rod is exposed out of the seat; the limiting rod is used for preventing the pressure head below the shaft sleeve connected with the shaft from rotating.
Preferably, at least one oil-free bushing is arranged between the seat and the first shaft.
Preferably, the valve oil seal is provided with a guide rod fixed on the pressure head.
The invention also provides a testing method of the automatic press-fitting and press-in depth measuring device for the valve oil seal, which comprises the following steps:
s1, detecting whether the valve oil seal self-tightening spring exists or not, the operation steps are as follows:
before the valve oil seal is pressed, the pressure head and the guide rod can be automatically fed by manpower or a robot, and whether the self-tightening spring on the valve oil seal exists can be detected by the optical fiber sensor fixed on the pressure head by the bolt through the sensor support.
S2, the operation steps of the indentation depth measuring function are as follows:
when the valve oil seal is pressed, the probe firstly contacts the cylinder cover below, after the valve oil seal is pressed, the clamp connecting block can be jacked up by the cylinder cover for a certain distance along with the probe, the displacement sensor can measure a numerical value afterwards, and the depth value of the valve oil seal pressed in is measured through PLC calculation, so that whether the valve oil seal is pressed in place or not is judged.
S3, the operation steps of pressure measurement are as follows:
when the probe in the S2 is jacked up by the cylinder cover, the probe jacks up the second shaft above the probe, after the second shaft contacts the shaft sleeve, the shaft sleeve transmits the jacking force of the second shaft to the pressure sensor on the shaft sleeve, and the pressure sensor can measure a pressure value, so that the pressure monitoring of the press-fitting valve oil seal is realized, and the valve oil seal is prevented from being damaged by excessive pressure.
The probe capable of moving up and down is adopted, the clamp connecting block is connected to the probe, and the displacement sensor is arranged above the clamp connecting block to detect the pressing-in depth of valve oil seal assembly; when the pressing depth is detected, the clamp connecting block compresses the spring on the T-shaped second shaft, so that the second shaft has an upward acting force, and the pressure sensor on the shaft sleeve 2 can detect the assembling pressure of the valve oil seal; whether a self-tightening spring on the valve oil seal exists or not can be detected through an optical fiber sensor on the pressure head (17); the device is used for monitoring the assembling pressure and the pressing depth of the valve oil seal and detecting the requirement on the existence of the self-tightening spring of the valve oil seal.
Drawings
FIG. 1 is a front view of an automatic press-fitting and press-in depth measuring device for a valve oil seal according to the present invention;
FIG. 2 is a left side view of the structure of an automatic press-fitting and press-in depth measuring device for a valve oil seal according to the present invention;
FIG. 3 is a cross-sectional view of FIG. 2;
fig. 4 is a structural perspective view of the automatic press-fitting and press-in depth measuring device for the valve oil seal according to the present invention.
Reference numbers in the figures:
1-seat; 2-gear connecting blocks; 3-axis; 4-a limiting rod; 5-oilless liner; 6-pad; 7-a spring; 8-equal height bolt; 9-connecting blocks; 10-O-rings; 11-a pressure sensor; 12-set; 13-axis; 14-a spring; 15-clamping a connecting block; 16-a probe; 17-pressure head; 18-a guide bar; 19-valve oil seal; 20-a displacement sensor; 21-installing a connecting block; 22-a fiber optic sensor; 23-sensor holder.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
As shown in fig. 1 to 4, the automatic press-fitting and press-in depth measuring device for the valve oil seal provided by the invention comprises a seat 1, wherein a first shaft 3 is embedded in the seat 1, and an upper oil-free bushing 5 and a lower oil-free bushing 5 are arranged between the seat 1 and the first shaft 3; the top of a axle 3 is equipped with and keeps off connecting block 2, and the bottom of a axle 3 extends to outside seat 1, it is equipped with first spring 7 to extend to the cover on a 1 outer axle 3 of seat, the below of a axle 3 is equipped with pressure head 17 that same axis set up, the bottom of pressure head 17 is equipped with valve oil seal 19, be equipped with the guide bar 18 of fixing on pressure head 17 on the valve oil seal 19. (the connection relation between the first shaft 3 and the connection stop block 2 and the seat 1 is the prior art, and is not the innovation point of the invention, so that the description is omitted here), a shaft sleeve 12 is arranged between the first shaft 3 and the pressure head 17, the upper end of the shaft sleeve 12 is in contact connection with the first shaft 3 through a connection block 9, the shaft sleeve 12 is mounted on the first shaft 3 through a climbing bolt 8, the lower end of the shaft sleeve 12 is connected with the pressure head 17 through a screw, a gap is reserved between the shaft sleeve 12 and the pressure head 17, and the pressure sensor 11 is mounted between the shaft sleeve 12 and the connection block 9 and sealed through an O-shaped ring 10.
A hollow cavity is arranged in the pressure head 17, a probe 16 which takes the hollow cavity as a guide rail to move up and down is arranged in the hollow cavity, the upper end of the probe 16 is arranged in the pressure head 17, and the lower end of the probe 16 extends out of the bottom of the pressure head 17;
install perpendicularly on the probe 16 and press from both sides connecting block 15 to leave the top of probe 16, press from both sides connecting block 15 one end and the perpendicular fixed connection of probe 16 in the pressure head 17, press from both sides the other one end of connecting block 15 and establish outside pressure head 17, the top of pressing from both sides connecting block 15 is equipped with displacement sensor 20 to the realization is to the indirect measurement of valve oil blanket depth of impressing.
A second shaft 13 capable of moving up and down is arranged above the probe 16 capable of moving up and down, the second shaft 13 is connected with the probe 16 through a second spring 14, the bottom end of the second spring 14 is sleeved outside the top reserved for the probe 16, the fixing frame is arranged on a clamp connecting block 15, and the top end of the second spring 14 is movably sleeved outside the bottom of the second shaft 13. The second shaft 13 is a T-shaped mechanism, the top of the second shaft 13 is arranged between the gap between the shaft sleeve 12 and the pressure head 17, and does not contact the shaft sleeve 12; when the probe 16 is jacked up by a cylinder cover below, the clamping block 15 connected to the probe 16 is synchronously jacked up, the second spring 14 on the clamping connecting block 15 jacks up the T-shaped structure of the second shaft 13 and compresses the second spring 14 through the T-shaped structure of the second shaft 13, the second shaft 13 is jacked up by the reaction force of the second spring 14, the top of the second shaft 13 is contacted with the shaft sleeve 12, and the pressure sensor 11 in the shaft sleeve 12 measures a pressure value.
A pair of correlation optical fiber sensors 22 are arranged on the pressure head 17, and the optical fiber sensors 22 are fixedly arranged on the pressure head 17 through a sensor bracket 23 by bolts so as to realize the detection of the existence of the valve oil seal self-tightening spring;
further, a limiting rod 4 is arranged on the shaft 3, one end of the limiting rod 4 is positioned in the shaft 3, and the other end of the limiting rod 4 is exposed out of the seat 1; the limiting rod 4 is used for preventing the rotation of a shaft sleeve 12 connected with the shaft 3 and a pressure head 17 connected below the shaft sleeve 12.
The invention also discloses a test method, which comprises the following steps:
s1, detecting whether the valve oil seal self-tightening spring exists or not, the operation steps are as follows:
before the valve oil seal is pressed, the material can be automatically fed to the pressure head 17 and the guide rod 18 manually or by a robot, and the existence of the self-tightening spring on the valve oil seal 19 can be detected by the optical fiber sensor 22 which is fixed on the pressure head 17 by a bolt through the sensor bracket 23.
S2, the operation steps of the indentation depth measuring function are as follows:
when the valve oil seal is pressed, the probe 16 firstly contacts a cylinder cover below, after the valve oil seal 19 is pressed, the clamp connecting block 15 can be jacked up by the cylinder cover for a certain distance along with the probe 16 so as to realize indirect measurement of the pressing-in depth of the valve oil seal, the displacement sensor 20 can measure a numerical value afterwards, the pressing-in depth value of the valve oil seal is measured through PLC calculation, and therefore whether the pressing-in of the valve oil seal 19 is in place or not is judged.
S3, the operation steps of pressure measurement are as follows:
when the probe 16 in S2 is jacked up by the cylinder head, the probe 16 jacks up the second shaft 13 above the probe 16, after the second shaft 13 contacts the shaft sleeve 12, the shaft sleeve 12 transmits the jacking acting force of the second shaft 13 to the pressure sensor 11 on the shaft sleeve 12, and the pressure sensor 11 can measure a pressure value, so as to monitor the pressure of the press-fitting valve oil seal, and prevent the valve oil seal from being damaged by excessive pressure.
The invention can realize the functions of detecting the existence of a valve oil seal self-tightening spring, pressing the valve oil seal, measuring pressure and measuring the pressing depth and is divided into four parts, as shown in figures 1, 2 and 3, a probe capable of moving up and down is adopted, a clamp connecting block is connected on the probe, and a displacement sensor is arranged above the clamp connecting block to realize the detection of the pressing depth of the valve oil seal assembly; when the pressing depth is detected, the clamp connecting block compresses the spring on the T-shaped second shaft, so that the second shaft has an upward acting force, and the pressure sensor on the shaft sleeve 2 can detect the assembling pressure of the valve oil seal; whether a self-tightening spring on the valve oil seal exists or not can be detected through an optical fiber sensor on the pressure head (17); the device is used for monitoring the assembling pressure and the pressing depth of the valve oil seal and detecting the requirement on the existence of the self-tightening spring of the valve oil seal.
Because the requirement on the press-fitting force of the valve oil seal is not more than a certain maximum value usually, the limit on the press-fitting force of the valve oil seal can be realized by adopting a proximity switch to detect that a limiting rod reaches a certain set value, so that the pressure can be monitored by replacing a pressure sensor through the scheme, and the cost is lower.
Further, the thickness of the connecting block 9 is sized to provide a clearance of 0.5mm between the shaft 3 and the sleeve 12;
furthermore, the dimensional tolerance of the guide rod 18 requires sliding fit with the valve guide pipe, and the surface of the guide rod 18 is smooth, so that the guide rod plays a role in guiding when a valve oil seal is pressed and installed.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. The utility model provides an automatic pressure equipment of valve oil blanket and degree of depth measuring device that impresses, includes seat (1), the embedded axle (3) that is equipped with of seat (1), the top of axle (3) is equipped with keeps off connecting block (2), and the bottom of axle (3) extends to outside seat (1), it is equipped with first spring (7) to extend to the cover on the outer axle (3) of seat (1), the below of axle (3) is equipped with pressure head (17) that same axis set up, the bottom of pressure head (17) is equipped with valve oil blanket (19), its characterized in that, be equipped with probe (16) that can reciprocate in pressure head (17), establish in pressure head (17) the upper end of probe (16), the lower extreme of probe (16) extends to outside the bottom of pressure head (17), be connected with on probe (16) and press from both sides connecting block (15), press from both sides connecting block (15) one end and pressure head (17) interior probe (16) fixed connection, the other end of the clamping connecting block (15) is arranged outside the pressure head (17), and a displacement sensor (20) is arranged above the clamping connecting block (15).
2. An automatic press-fitting and press-in depth measuring device for a valve oil seal according to claim 1, wherein a second shaft (13) is arranged above the probe (16), and a pressure sensor (11) is arranged above the second shaft (13).
3. An automatic press-fitting and press-in depth measuring device for a valve oil seal according to claim 2, wherein a shaft sleeve (12) is arranged between the first shaft (3) and the pressure head (17), the upper end of the shaft sleeve (12) is connected with the first shaft (3) through a connecting block (9), the lower end of the shaft sleeve (12) is connected with the pressure head (17), and the pressure sensor (11) is installed between the shaft sleeve (12) and the connecting block (9).
4. An automatic press-fitting and press-in depth measuring device for a valve oil seal according to claim 3, wherein the pressure sensor (11) and the connecting block (9) are sealed by an O-shaped ring (10).
5. An automatic press-fitting and press-in depth measuring device for a valve oil seal according to claim 2, characterized in that the second shaft (13) is connected with the probe (16) moving up and down through a second spring (14), the bottom end of the second spring (14) is sleeved outside the top of the probe (16), and the top end of the second spring (14) is sleeved outside the bottom of the second shaft (13).
6. An automatic press-fitting and press-in depth measuring device for a valve oil seal according to claim 1 or 2, wherein the pressure head (17) is provided with an optical fiber sensor (22), and the optical fiber sensor (22) is mounted on the pressure head (17) through a sensor support (23).
7. An automatic press-fitting and press-in depth measuring device for a valve oil seal according to claim 1, wherein a limiting rod (4) is arranged on the shaft (3), one end of the limiting rod (4) is positioned in the shaft (3), and the other end of the limiting rod (4) is exposed out of the seat (1); the limiting rod (4) is used for preventing a pressure head (17) below a shaft sleeve (12) connected with the shaft (3) from rotating.
8. An automatic press-fitting and press-in depth measuring device for a valve oil seal according to claim 1, characterized in that at least one oil-free bushing (5) is arranged between the seat (1) and the first shaft (3).
9. An automatic press-fitting and press-in depth measuring device for a valve oil seal according to claim 1, wherein the valve oil seal (19) is provided with a guide rod (18) fixed on the pressure head (17).
10. The testing method of the automatic press-fitting and press-in depth measuring device for the valve oil seal according to claims 1 to 9, characterized by comprising the following steps:
s1, detecting whether the valve oil seal self-tightening spring exists or not, the operation steps are as follows:
before the valve oil seal is pressed, the valve oil seal can be automatically fed onto the pressure head (17) and the guide rod (18) manually or by a robot, and whether a self-tightening spring on the valve oil seal (19) exists can be detected by the optical fiber sensor (22) which is fixed on the pressure head (17) through the sensor bracket (23) by using a bolt.
S2, the operation steps of the indentation depth measuring function are as follows:
when the valve oil seal is pressed, the probe (16) firstly contacts the cylinder cover below, the valve oil seal (19) is pressed, the clamp connecting block (15) can be jacked up by the cylinder cover for a certain distance along with the probe (16), the displacement sensor (20) can measure a numerical value afterwards, and the depth value of the valve oil seal pressed in is measured through PLC calculation, so that whether the valve oil seal (19) is pressed in place or not is judged.
S3, the operation steps of pressure measurement are as follows:
when the probe (16) in the S2 is jacked up by the cylinder cover, the probe (16) can jack up the second shaft (13) above the probe (16) together, after the second shaft (13) contacts the shaft sleeve (12), the shaft sleeve (12) transmits the jacking acting force of the second shaft (13) to the pressure sensor (11) on the shaft sleeve (12), the pressure sensor (11) can measure a pressure value, pressure monitoring of the press-mounting valve oil seal is realized, and the valve oil seal is prevented from being damaged by excessive pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910882089.1A CN110614497A (en) | 2019-09-18 | 2019-09-18 | Automatic press fitting and pressing depth measuring device for valve oil seal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910882089.1A CN110614497A (en) | 2019-09-18 | 2019-09-18 | Automatic press fitting and pressing depth measuring device for valve oil seal |
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| CN110614497A true CN110614497A (en) | 2019-12-27 |
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| CN201910882089.1A Pending CN110614497A (en) | 2019-09-18 | 2019-09-18 | Automatic press fitting and pressing depth measuring device for valve oil seal |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112393700A (en) * | 2020-09-30 | 2021-02-23 | 广西玉柴机器股份有限公司 | Oil seal press-fitting measuring device |
| CN113607114A (en) * | 2021-08-02 | 2021-11-05 | 芜湖全程智能科技有限公司 | Automobile EPB pressure shaft sleeve measuring mechanism |
| CN113732658A (en) * | 2021-08-03 | 2021-12-03 | 东风汽车集团股份有限公司 | Shaft part press-fitting equipment and control method thereof |
| CN114136794A (en) * | 2021-10-21 | 2022-03-04 | 大冶特殊钢有限公司 | Method for detecting actual rolling reduction of forging steel material of hydraulic press |
| CN114147453A (en) * | 2022-01-05 | 2022-03-08 | 宁波纬尚驱动轴有限公司 | Device for pressing three-ball pin |
| CN114346657A (en) * | 2021-12-08 | 2022-04-15 | 重庆铁马工业集团有限公司 | Special structure oil seal assembling method |
| CN114562926A (en) * | 2020-11-27 | 2022-05-31 | 北京福田康明斯发动机有限公司 | Crankshaft oil seal press-fitting depth and jumping detection tool |
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