CN113982882A - Ball head connecting rod structure for bellows seal - Google Patents
Ball head connecting rod structure for bellows seal Download PDFInfo
- Publication number
- CN113982882A CN113982882A CN202111261527.6A CN202111261527A CN113982882A CN 113982882 A CN113982882 A CN 113982882A CN 202111261527 A CN202111261527 A CN 202111261527A CN 113982882 A CN113982882 A CN 113982882A
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- Prior art keywords
- ball
- corrugated pipe
- connecting rod
- tile
- ball head
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/0005—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 adaptations of pistons
- F04B39/0022—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 adaptations of pistons piston rods
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/02—Lubrication
- F04B39/0284—Constructional details, e.g. reservoirs in the casing
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pivots And Pivotal Connections (AREA)
Abstract
The invention discloses a ball head connecting rod structure for sealing a corrugated pipe, and relates to the technical field of mechanical connecting rod transmission; the corrugated pipe type ball joint comprises a ball joint connecting rod structure, a corrugated pipe is sleeved outside the ball joint connecting rod structure, one end of the corrugated pipe is fixedly and hermetically connected with a connecting seat, the other end of the corrugated pipe is fixedly and hermetically connected with a base plate, and the ball joint connecting rod structure is arranged in a sealing cavity formed by the connecting seat, the corrugated pipe and the base plate. According to the corrugated pipe sealed ball head connecting rod structure, the metal corrugated pipe is used for integrally sealing the ball head connecting rod and then the ball head connecting rod is used as a relatively independent part, so that oil vapor is effectively prevented from escaping.
Description
Technical Field
The invention relates to the technical field of mechanical connecting rod transmission, in particular to a ball head connecting rod structure for sealing a corrugated pipe.
Background
The ball head connecting rod is one of key parts of the oil-free plunger pump. The key characteristics of the oil-free plunger pump are that oil is completely absent in the working atmosphere, lubricating grease is absent, the cleanliness of transported gas is guaranteed to the maximum extent, and the spherical contact pair of the ball head connecting rod is lubricated and is often a short plate for the gas cleanliness of the oil-free plunger pump. At present, a main sealing mode of ball head connecting rod lubricating oil is that a dust cover or a clamp spring is arranged on the local part of a ball head, so that lubricating oil leakage can be effectively prevented, but oil steam at a connecting rod shaft neck part cannot be prevented from escaping, and therefore the cleanliness of gas transported by an oilless plunger pump is influenced.
Disclosure of Invention
The invention aims to provide a ball head connecting rod structure of a bellows seal, which aims to solve the problems in the prior art.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a ball head connecting rod structure sealed by a corrugated pipe, which comprises a ball head connecting rod structure, wherein the outer sleeve of the ball head connecting rod structure is provided with the corrugated pipe, one end of the corrugated pipe is fixedly and hermetically connected with a connecting seat, the other end of the corrugated pipe is fixedly and hermetically connected with a base plate, the ball head connecting rod structure is arranged in a sealing cavity formed by the connecting seat, the corrugated pipe and the base plate, the connecting seat, the corrugated pipe and the base plate form a closed space for a spherical contact pair to work, the ball head connecting rod, a ball tile and a contact pair lubricating oil thereof are isolated from the external atmosphere, and the lubricating oil is prevented from polluting external working gas, and substances such as external dust, particles and the like are prevented from polluting the spherical contact pair. The ball head connecting rod structure of the bellows seal provided by the invention can be used as a transmission structure of equipment such as an oil-free plunger pump and the like.
Optionally, the ball head connecting rod structure comprises a ball head connecting rod, the ball head connecting rod is preferably made of 38CrMoAl and other alloy structural steels, after surface carburization, the ball head part is subjected to ultra-precision machining by adopting an ultra-precision machining means, the surface roughness is smaller than 10nm, the profile precision is smaller than 0.005mm, the ball heads at two ends of the ball head connecting rod are respectively wrapped in a cavity formed by the corresponding ball shoes, the ball heads at two sides of the ball head connecting rod are respectively wrapped by a spherical cavity formed by a first ball shoe and two semi-ball shoes to form an upper spherical contact pair and a lower spherical contact pair of the connecting rod, and a first through hole is formed in the ball head connecting rod; the spherical tile comprises a first spherical tile and two hemispherical tiles, wherein the first spherical tile and the hemispherical tiles are preferably made of brass and the like, the surface of the first spherical tile and the surface of the hemispherical tile are subjected to ultra-precision machining of the inner surface by adopting an ultra-precision machining means, the surface roughness is less than 10nm, the profile precision is less than 0.005mm, one end of the first spherical tile is fixedly abutted against the two hemispherical tiles, and the other end of the first spherical tile is provided with a second through hole; the ball tile positioned above is fixedly arranged in the connecting seat, the ball tile positioned below is fixedly arranged in the corrugated pipe, the bottom of the first ball tile positioned below is provided with a blocking sleeve, an oil cup is arranged in the blocking sleeve, the bottom of the oil cup is communicated with the blocking sleeve through a connecting hole, the top of the oil cup is communicated with the first ball tile positioned below the ball head connecting rod, and the blocking sleeve is communicated with the interior of the corrugated pipe through an oil return hole; the oil cup is internally provided with a steel ball capable of plugging the connecting hole, so that the function of one-way oil pumping is realized, and a cylindrical pin is arranged at the communication position of the oil cup and the first ball tile.
Optionally, connecting flanges are fixedly arranged at two ends of the corrugated pipe, the bottom of the plug sleeve is fixedly connected with the connecting flange below the corrugated pipe through a first screw, the connecting flange above the corrugated pipe is fixedly connected with a flange at the bottom of the connecting seat through a second screw, the top of the connecting seat is fixedly connected with an adjusting cover through a third screw, the adjusting cover is convenient for adjusting the total length of the ball head connecting rod structure to adapt to installation requirements, and the backing plate and the adjusting cover can rotate relatively at a certain angle, so that motion transmission is realized; the connecting flange below the corrugated pipe is fixedly connected with the base plate through a fourth screw; the base plate and the adjusting cover are respectively used for connecting two ends of the transmission structure.
Optionally, a blind hole is formed in the upper end of the base plate, one end of the first screw is located in the blind hole of the base plate, and the other end of the first screw penetrates through a connecting flange below the corrugated pipe and then is fixedly connected with the bottom of the plug bush.
Optionally, a first metal sealing element is arranged between the connecting flange above the corrugated pipe and the connecting seat, and a second metal sealing element is arranged between the connecting flange below the corrugated pipe and the backing plate.
Optionally, the bottom of the upper spherical tile is fixedly abutted with a threaded retainer ring, and the outer wall of the threaded retainer ring is fixedly connected with the inner wall of the connecting seat through threads; the spherical tile positioned below is fixedly arranged in the corrugated pipe through a connecting sleeve, and the upper part of the connecting sleeve extends into the connecting sleeve and then is fixedly connected with the bottom of the first spherical tile positioned below.
Optionally, the second through hole is formed in the center of the end face of the first spherical tile, and an oil groove structure is formed in the inner spherical surface of the first spherical tile.
When the vertical installation of bulb connecting rod structure was used, lubricating oil added in the bellows: lubricating oil enters the oil cup through the oil return hole of the blocking sleeve: the steel ball in the oil cup plays the role of a one-way valve; under the action of integral downward movement and a steel ball one-way valve, lubricating oil is pumped into a ball tile at the bottom of the ball head connecting rod, and lubrication of a spherical contact pair is realized through an oil groove in the ball tile; meanwhile, lubricating oil in the through hole of the ball head connecting rod is pumped into a spherical contact pair at the top of the connecting rod under the action of the steel ball check valve, and the spherical contact pair is lubricated through a ball bearing oil groove structure; the lubricating oil at the top of the connecting rod falls into the corrugated pipe under the action of gravity to form a lubricating oil loop.
Compared with the prior art, the invention has the following technical effects:
the invention provides a metal corrugated pipe which is used for integrally sealing the ball head connecting rod and then is used as a relatively independent part, so that oil vapor is effectively prevented from escaping, the problem of oil vapor pollution of the ball head connecting rod in an oil-free plunger pump is solved, and the metal corrugated pipe is an ideal structure for mechanical transmission connection in a clean vacuum environment. Meanwhile, an oil groove and an oil hole structure are designed, the lubricating effect of the ball head connecting rod is improved, and the service life is guaranteed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic view of a ball joint connecting rod structure of the bellows seal of the present invention;
FIG. 2 is a schematic view of a first spherical tile of the present invention;
FIG. 3 is a schematic view of a hemispherical tile construction of the present invention;
FIG. 4 is a schematic view of the structure of the plugging sleeve of the present invention;
FIG. 5 is a schematic view of the structure of the oil cup of the present invention;
description of reference numerals: 1. the bearing comprises a base plate 2, a first screw 3, a corrugated pipe 4, a ball head connecting rod 5, a first metal sealing element 6, a second screw 7, a connecting seat 8, a third screw 9, an adjusting cover 10, a first ball tile 11, a hemisphere tile 12, a threaded retainer ring 13, a connecting sleeve 14, a cylindrical pin 15, an oil cup 16, a steel ball 17, a blocking sleeve 18, a fourth screw 19 and a second metal sealing element.
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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a ball head connecting rod structure of a bellows seal, which aims to solve the problems in the prior art.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to the attached drawings 1-5, the invention provides a bellows-sealed ball head connecting rod structure, which comprises a ball head connecting rod structure, wherein a bellows 3 is sleeved outside the ball head connecting rod structure, one end of the bellows 3 is fixedly and hermetically connected with a connecting seat 7, the other end of the bellows 3 is fixedly and hermetically connected with a backing plate 1, the ball head connecting rod structure is arranged in a sealing cavity formed by the connecting seat 7, the bellows 3 and the backing plate 1, two ends of the bellows 3 are fixedly provided with connecting flanges, the bottom of the ball head connecting rod structure is provided with a plugging sleeve 17, the bottom of the plugging sleeve 17 is fixedly connected with the connecting flange below the bellows 3 through a first screw 2, the upper end of the backing plate 1 is provided with a blind hole, one end of the first screw 2 is positioned in the blind hole of the backing plate 1, the other end of the first screw passes through the connecting flange below the bellows 3 and is fixedly connected with the bottom of the plugging sleeve 17, the connecting flange above the bellows 3 is fixedly connected with a flange at the bottom of the connecting seat 7 through a second screw 6, the top of the connecting seat 7 is fixedly connected with an adjusting cover 9 through a third screw 8, the adjusting cover 9 is convenient for adjusting the total length of the ball head connecting rod structure, the installation requirement is met, and the backing plate 1 and the adjusting cover 9 can rotate relatively at a certain angle, so that the motion transmission is realized; the connecting flange below the corrugated pipe 3 is fixedly connected with the cushion plate 1 through a fourth screw 18; the base plate 1 and the adjusting cover 9 are respectively used for connecting two ends of the transmission structure; the connecting seat 7, the corrugated pipe 3 and the base plate 1 form a closed space for the work of the spherical contact pair, and the ball head connecting rod, the ball tile and the lubricating oil of the contact pair are isolated from the external atmosphere, so that the lubricating oil is prevented from polluting the external working gas, and the substances such as external dust, particles and the like are prevented from polluting the spherical contact pair. The ball head connecting rod structure of the bellows seal provided by the invention can be used as a transmission structure of equipment such as an oil-free plunger pump and the like.
The ball head connecting rod structure comprises a ball head connecting rod 4, wherein the ball head connecting rod 4 is made of 38CrMoAl alloy structural steel, the ball head part is subjected to ultra-precision machining by an ultra-precision machining means after surface carburization, the surface roughness is smaller than 10nm, the profile precision is smaller than 0.005mm, ball heads at two ends of the ball head connecting rod 4 are respectively wrapped in cavities formed by corresponding ball tiles, the ball heads at two sides of the ball head connecting rod 4 are respectively wrapped by a spherical cavity formed by combining a first ball tile 10 and two hemispherical tiles 11 to form an upper spherical contact pair and a lower spherical contact pair of the connecting rod, and a first through hole is formed in the ball head connecting rod 4; the spherical tile comprises a first spherical tile 10 and two hemispherical tiles 11, a spherical cavity for accommodating the ball head is formed by the first spherical tile 10 and the two hemispherical tiles 11 together, materials such as brass are selected for the first spherical tile 10 and the hemispherical tiles 11, the surface is subjected to ultra-precision machining on the inner surface by adopting an ultra-precision machining means, the surface roughness is less than 10nm, the profile precision is less than 0.005mm, one end of the first spherical tile 10 is fixedly abutted against the two hemispherical tiles 11, and a second through hole is formed in the other end of the first spherical tile; the ball tile positioned above is fixedly arranged in the connecting seat 7, the ball tile positioned below is fixedly arranged in the corrugated pipe 3, the bottom of the first ball tile 10 positioned below is provided with a blocking sleeve 17, an oil cup 15 is arranged in the blocking sleeve 17, the bottom of the oil cup 15 is communicated with the blocking sleeve 17 through a connecting hole, the top of the oil cup 15 is communicated with the first ball tile 10 positioned below the ball head connecting rod 4, and the blocking sleeve 17 is communicated with the inside of the corrugated pipe 3 through an oil return hole; the inside of the oil cup 15 is provided with a steel ball 16 capable of plugging the connecting hole, so that the function of one-way oil pumping is realized, and a cylindrical pin 14 is arranged at the connecting position of the oil cup 15 and the first ball tile 10.
A first metal sealing element 5 is arranged between the connecting flange above the corrugated pipe 3 and the connecting seat 7, and a second metal sealing element 19 is arranged between the connecting flange below the corrugated pipe 3 and the backing plate 1. The bottom of the upper spherical tile is fixedly abutted with a threaded retainer ring 12, and the outer wall of the threaded retainer ring 12 is fixedly connected with the inner wall of the connecting seat 7 through threads; the lower spherical tile is fixedly arranged in the corrugated pipe 3 through a connecting sleeve 13, and the upper part of the blocking sleeve 17 extends into the connecting sleeve 13 and is fixedly connected with the bottom of the lower first spherical tile 10. The second through hole is arranged at the center of the end face of the first spherical tile 10, and an oil groove structure is arranged on the surface of the inner ball of the first spherical tile 10.
When the corrugated pipe is vertically installed and used, lubricating oil is added into the corrugated pipe 3, the lubricating oil enters the oil cup 15 through the oil return hole of the blocking sleeve 17, and the steel ball 16 in the oil cup 15 plays a role of a one-way valve; under the action of integral downward movement and the steel ball 16 one-way valve, lubricating oil is pumped into a ball tile at the bottom of the ball head connecting rod, and lubrication of a spherical contact pair is realized through an oil groove in the ball tile; meanwhile, lubricating oil in the through hole of the ball head connecting rod is pumped into a spherical contact pair at the top of the connecting rod under the action of the steel ball check valve, and the spherical contact pair is lubricated through a ball bearing oil groove structure; the lubricating oil at the top of the connecting rod falls into the corrugated pipe 3 under the action of gravity to form a lubricating oil loop.
In the description of the present invention, it should be noted that the terms "center", "top", "bottom", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (7)
1. The utility model provides a bulb connecting rod structure of bellows seal which characterized in that: the corrugated pipe type ball joint comprises a ball joint connecting rod structure, a corrugated pipe is sleeved outside the ball joint connecting rod structure, one end of the corrugated pipe is fixedly and hermetically connected with a connecting seat, the other end of the corrugated pipe is fixedly and hermetically connected with a base plate, and the ball joint connecting rod structure is arranged in a sealing cavity formed by the connecting seat, the corrugated pipe and the base plate.
2. The bellows seal ball-end joint structure of claim 1, wherein: the ball head connecting rod structure comprises a ball head connecting rod, ball heads at two ends of the ball head connecting rod are respectively wrapped in a cavity formed by the corresponding ball tiles, and a first through hole is formed in the ball head connecting rod; the spherical tile comprises a first spherical tile and two hemispherical tiles, one end of the first spherical tile is fixedly abutted against the two hemispherical tiles, and the other end of the first spherical tile is provided with a second through hole; the ball tile positioned above is fixedly arranged in the connecting seat, the ball tile positioned below is fixedly arranged in the corrugated pipe, the bottom of the first ball tile positioned below is provided with a blocking sleeve, an oil cup is arranged in the blocking sleeve, the bottom of the oil cup is communicated with the blocking sleeve through a connecting hole, the top of the oil cup is communicated with the first ball tile positioned below the ball head connecting rod, and the blocking sleeve is communicated with the interior of the corrugated pipe through an oil return hole; the oil cup is internally provided with a steel ball capable of plugging the connecting hole, and a cylindrical pin is arranged at the communication position of the oil cup and the first ball tile.
3. The bellows seal ball-end joint structure of claim 2, wherein: connecting flanges are fixedly arranged at two ends of the corrugated pipe, the bottom of the plugging sleeve is fixedly connected with the connecting flange below the corrugated pipe through a first screw, the connecting flange above the corrugated pipe is fixedly connected with a flange at the bottom of the connecting seat through a second screw, the top of the connecting seat is fixedly connected with an adjusting cover through a third screw, and the connecting flange below the corrugated pipe is fixedly connected with the backing plate through a fourth screw; the base plate and the adjusting cover are respectively used for connecting two ends of the transmission structure.
4. A bellows seal ball-end link structure according to claim 3, wherein: the upper end of the base plate is provided with a blind hole, one end of the first screw is located in the blind hole of the base plate, and the other end of the first screw penetrates through the connecting flange below the corrugated pipe and then is fixedly connected with the bottom of the blocking sleeve.
5. A bellows seal ball-end link structure according to claim 3, wherein: a first metal sealing element is arranged between the connecting flange above the corrugated pipe and the connecting seat, and a second metal sealing element is arranged between the connecting flange below the corrugated pipe and the base plate.
6. A bellows seal ball-end link structure according to claim 3, wherein: the bottom of the ball tile positioned above is fixedly abutted with a threaded retainer ring, and the outer wall of the threaded retainer ring is fixedly connected with the inner wall of the connecting seat through threads; the spherical tile positioned below is fixedly arranged in the corrugated pipe through a connecting sleeve, and the upper part of the connecting sleeve extends into the connecting sleeve and then is fixedly connected with the bottom of the first spherical tile positioned below.
7. A bellows seal ball-end link structure according to claim 3, wherein: the second through hole is formed in the center of the end face of the first spherical tile, and an oil groove structure is formed in the surface of the inner ball of the first spherical tile.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111261527.6A CN113982882B (en) | 2021-10-28 | 2021-10-28 | Bulb connecting rod structure with bellows sealed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111261527.6A CN113982882B (en) | 2021-10-28 | 2021-10-28 | Bulb connecting rod structure with bellows sealed |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113982882A true CN113982882A (en) | 2022-01-28 |
| CN113982882B CN113982882B (en) | 2023-06-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111261527.6A Active CN113982882B (en) | 2021-10-28 | 2021-10-28 | Bulb connecting rod structure with bellows sealed |
Country Status (1)
| Country | Link |
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| CN (1) | CN113982882B (en) |
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|---|---|---|---|---|
| CN1167878A (en) * | 1996-06-06 | 1997-12-17 | 周海威 | Straight shaft plunger mud pump |
| WO2006032256A1 (en) * | 2004-09-24 | 2006-03-30 | Zf Friedrichshafen Ag | Ball joint with a sealing bellow |
| JP2009068519A (en) * | 2007-09-10 | 2009-04-02 | Honda Motor Co Ltd | Ball joint |
| JP2014211182A (en) * | 2013-04-18 | 2014-11-13 | Nok株式会社 | Dust cover for ball joint |
| US20150128415A1 (en) * | 2013-11-14 | 2015-05-14 | Schaeffler Technologies Gmbh & Co. Kg | Water pump bearing with integrated mechanical seal |
| CN106969058A (en) * | 2016-06-22 | 2017-07-21 | 朱德伟 | A kind of ball pivot power transmission shaft |
| CN107939627A (en) * | 2017-12-25 | 2018-04-20 | 邵阳维克液压股份有限公司 | Plungers pump plunger and the bent axis type axial piston pump with the plunger |
| CN108468709A (en) * | 2018-05-07 | 2018-08-31 | 安徽迪尔荣机械有限公司 | A kind of automobile steering ball with long service life |
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2021
- 2021-10-28 CN CN202111261527.6A patent/CN113982882B/en active Active
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|---|---|---|---|---|
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| WO2006032256A1 (en) * | 2004-09-24 | 2006-03-30 | Zf Friedrichshafen Ag | Ball joint with a sealing bellow |
| JP2009068519A (en) * | 2007-09-10 | 2009-04-02 | Honda Motor Co Ltd | Ball joint |
| JP2014211182A (en) * | 2013-04-18 | 2014-11-13 | Nok株式会社 | Dust cover for ball joint |
| US20150128415A1 (en) * | 2013-11-14 | 2015-05-14 | Schaeffler Technologies Gmbh & Co. Kg | Water pump bearing with integrated mechanical seal |
| CN106969058A (en) * | 2016-06-22 | 2017-07-21 | 朱德伟 | A kind of ball pivot power transmission shaft |
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| Publication number | Publication date |
|---|---|
| CN113982882B (en) | 2023-06-06 |
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