CN208106744U - A kind of gear oil pump reducing gear force in radial - Google Patents
A kind of gear oil pump reducing gear force in radial Download PDFInfo
- Publication number
- CN208106744U CN208106744U CN201820530576.2U CN201820530576U CN208106744U CN 208106744 U CN208106744 U CN 208106744U CN 201820530576 U CN201820530576 U CN 201820530576U CN 208106744 U CN208106744 U CN 208106744U
- Authority
- CN
- China
- Prior art keywords
- gear
- oil
- radial
- mounting hole
- gear shaft
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Rotary Pumps (AREA)
Abstract
The utility model discloses the gear oil pumps that one kind can reduce gear force in radial, it is fitted in the side plate of the both ends of the surface of the driving gear and the driven gear respectively including shell, driving gear, driven gear, driving gear shaft, driven gear shaft, be set on the driving gear shaft and the driven gear shaft two, the part positioned at low-pressure area of the outer peripheral surface of the side plate is the arc surface of radius R1, the part positioned at higher-pressure region of the outer peripheral surface of the side plate is the arc surface of radius R3, wherein, R1 > R3；The part positioned at transition region of the outer peripheral surface of the side plate is the second level ladder arc surface that radius is followed successively by R3, R2 from inside to outside, wherein R1 > R2 > R3.The utility model can be under the premise of fully ensuring that sealing performance, expand higher-pressure region to greatest extent, i.e. expansion pressure oil cavity pressure guarantees the fluid pressure balance of circumference of gear in the zone of action on circumference of gear, reduce gear force in radial, to effectively improve the service life of gear oil pump.
Description
Technical field
The utility model relates to gear oil pump fields, relate in particular to a kind of gear that can reduce gear force in radial
Oil pump.
Background technique
Gear oil pump is the equipment that machinery field commonly is used to convey liquid.The main component of gear oil pump have shell,
Driving gear, driven gear, driving gear shaft, driven gear shaft, be set on driving gear shaft and driven gear shaft two
It is fitted in the components such as side plate and bearing, the sealing of the both ends of the surface of driving gear and driven gear respectively.
The functional reliability of wheel pump and service life depend primarily on performance and the service life of bearing, and the performance of bearing and service life
Directly proportional to radial force suffered by the magnitude of load i.e. gear that it bears, radial force suffered by driving gear and driven gear is main
It is as caused by uneven along circumference of gear hydraulic coupling.
The side plate of gear oil pump is one of the critical component in gear oil pump, the outer peripheral surface of existing gear oil pump side plate
It is the constant arc surface of diameter positioned at the part of higher-pressure region, transition region and low-pressure area, this design is to diameter suffered by gear oil pump
There is no any advantageous improvement to power.
In addition, the shell of gear oil pump is generally made of front cover, the pump housing and rear cover, pinion mounting holes are provided in the pump housing, it is preceding
Driving gear shaft mounting hole and driven gear shaft mounting hole are provided in lid and rear cover, when assembling gear oil pump, driving gear shaft
DU bushing, driving gear shaft and driven gear shaft is separately installed in mounting hole and driven gear shaft mounting hole to serve as a contrast across corresponding DU
Set；In addition to sealing, it is additionally provided with driving gear shaft seal mounting hole in front cover, is set on driving gear shaft for installing
Oil sealing is sealed gear oil pump with this；Oil inlet and oil outlet are provided on the pump housing, when oil inlet and oil outlet positional shift
When, to prevent pocketed oil, the oil inlet being connected to oil inlet can be also opened up in the pump housing and crosses oil pocket road and is connected to oil outlet fuel-displaced
Cross oil pocket road.
This shell can only realize that the function of component installation, poor radiation not can guarantee gear oil pump in high requirement work
Service performance under condition.
Utility model content
The technical problem to be solved by the utility model is to provide the gear oil pumps that one kind can reduce gear force in radial.
In order to solve the above-mentioned technical problem, the utility model adopts the following technical solution：One kind can reduce diameter suffered by gear
To the gear oil pump of power, including shell, driving gear, driven gear, driving gear shaft, driven gear shaft, it is set in the master
Two on movable gear shaft and the driven gear shaft are fitted in the both ends of the surface of the driving gear and the driven gear respectively
Side plate, it is characterised in that：The part positioned at low-pressure area of the outer peripheral surface of the side plate is the arc surface of radius R1, the side plate
Outer peripheral surface the part positioned at higher-pressure region be radius R3 arc surface, wherein R1 > R3；
The part positioned at transition region of the outer peripheral surface of the side plate is the second level ladder that radius is followed successively by R3, R2 from inside to outside
Arc surface, wherein R1 > R2 > R3.
Further, R1-R2=0.21~0.32mm, R2-R3=1.15~1.35mm.
Further, R1=26.96~26.97mm, R2=26.65~26.75mm, R3=25.4~25.5mm.
Further, the shell includes front cover, the pump housing and rear cover, and the front cover and the pump housing are an integral molding structure
What part, the front cover and the pump housing were constituted is equipped with oil inlet and oil outlet on the whole, what the front cover and the pump housing were constituted
Pinion mounting holes, preceding driving gear shaft mounting hole, preceding driven gear shaft mounting hole and driving gear shaft oil sealing are equipped in whole
Mounting hole；
Be additionally provided in the entirety that the front cover and the pump housing are constituted with the preceding driving gear shaft mounting hole, it is described before from
Cavity road is held in the mouth by opening in the preceding rank cavity road that movable gear shaft mounting hole is connected to the driving gear shaft seal mounting hole before described
The whole intracorporal preceding oil return hole that the front cover and the pump housing are constituted is located to be connected to the oil inlet.
Further, the oil inlet being connected to the oil inlet is additionally provided in the entirety that the front cover and the pump housing are constituted
Oily channel, the preceding oil return hole are connected to the oil inlet oil passage, realize the preceding rank cavity road and the oil inlet with this
Connection.
Further, covered after described be provided with rear drive gear shaft mounting hole, rear driven gear shaft mounting hole and with institute
The rear rank cavity road that rear drive gear shaft mounting hole is connected to the rear driven gear shaft mounting hole is stated, it is logical to hold in the mouth cavity road after described
The rear oil return hole being provided in the rear cover is crossed to be connected to the pinion mounting holes.
Further, it is covered after described and is provided with hydraulic fluid port.
Further, the whole front end outer peripheral surface that the front cover and the pump housing are constituted is outwardly extended in a radial direction there are two more than
Convex block, be provided with mounting hole on the convex block.
Further, the inlet port side on the gear joint surface of the side plate and press oil port side have drain charge slot.
Further, the inlet port side of the side plate is provided with inlet port, the inlet port side on the gear joint surface of the side plate
The drain charge slot outer rim exceed the inlet port.
The beneficial effects of the utility model are embodied in：
The utility model is located at higher-pressure region, transition region and low pressure on the basis of existing technology, by the outer peripheral surface of side plate
The diameter design of the part in area designs in this way at the form of stepped change, can be under the premise of fully ensuring that sealing performance, most
Limits expand higher-pressure region, i.e. expansion pressure oil cavity pressure guarantees the hydraulic of circumference of gear in the zone of action on circumference of gear
Dynamic balance greatly reduces gear force in radial, so that effectively improving gear oil pump uses the longevity under high temperature, high pressure, high speed
Life.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of an embodiment of the present invention.
Fig. 2 is the structural schematic diagram on the gear joint surface of an embodiment of the present invention latus inframedium.
Fig. 3 is the structural schematic diagram on the pump housing joint surface of an embodiment of the present invention latus inframedium.
Fig. 4 is the cross-sectional view of an embodiment of the present invention latus inframedium.
Fig. 5 is the structural schematic diagram of shell in an embodiment of the present invention.
Fig. 6 is the whole right view that front cover and the pump housing are constituted in Fig. 5.
Fig. 7 is the whole left view that front cover and the pump housing are constituted in Fig. 5.
Fig. 8 is E-E cross-sectional view.
Fig. 9 is B-B cross-sectional view.
Figure 10 is the left view of rear cover in Fig. 5.
Figure 11 is the right view of rear cover in Fig. 5.
Figure 12 is A-A cross-sectional view.
In attached drawing the label of each component be：
Driven gear shaft mounting hole, 104 before driving gear shaft mounting hole, 103 before 10 entirety, 101 pinion mounting holes, 102
Oil return hole, 107 oil inlet oil passages, 108 fuel-displaced oil excessively are logical before rank cavity road, 106 before driving gear shaft seal mounting hole, 105
Road, 109 convex blocks, 1010 oil inlets, 1011 oil outlets；
Cavity road, 204 are held in the mouth behind 20 rear covers, 201 rear drive gear shaft mounting holes, 202 behind driven gear shaft mounting hole, 203
Oil return hole, 205 hydraulic fluid ports afterwards；
30 side plates, 301 inlet ports, 302 drain charge slots, 303 sealing ring installation grooves, 304 oil grooves；
40 driving gears, 50 driven gears, 60 driving gear shafts, 70 driven gear shafts.
Specific embodiment
The utility model will be described in detail below with reference to the accompanying drawings and embodiments.It should be noted that not conflicting
In the case where, the features in the embodiments and the embodiments of the present application can be combined with each other.
Referring to Fig. 1 to Fig. 4.
The utility model can reduce the gear oil pump of gear force in radial, including shell, driving gear 40, driven gear
50, driving gear shaft 60, driven gear shaft 70, be set on the driving gear shaft 50 and the driven gear shaft 60 two
It is fitted in the side plate 30 of the both ends of the surface of the driving gear 40 and the driven gear 50 respectively, specific structure and installation etc. are by existing
There is the requirement of technology to execute.
The utility model designs the part positioned at low-pressure area of the outer peripheral surface of the side plate 30 on the basis of existing structure
For the arc surface of radius R1, the part positioned at higher-pressure region of the outer peripheral surface of the side plate 30 is the arc surface of radius R3, wherein R1
> R3；
The part positioned at transition region of the outer peripheral surface of the side plate 30 is the second level rank that radius is followed successively by R3, R2 from inside to outside
Terraced arc surface, wherein R1 > R2 > R3.
Here the direction for referring to the pump housing joint surface from the gear joint surface of side plate 30 to side plate 30 " from inside to outside "；This
In low-pressure area, higher-pressure region, transition region i.e. the low-pressure area of gear oil pump, higher-pressure region, transition region, these three regions be basis
What gear parameter used in gear oil pump etc. determined, it is the inherent characteristic of gear oil pump, the low of top half is merely illustrated in figure
Pressure area, higher-pressure region, transition region, the low-pressure area of lower half portion, higher-pressure region, transition region and the low-pressure area of top half, higher-pressure region, mistake
Cross that area is symmetrical, this is the common knowledge of this field, for the sake of succinct description, goes to live in the household of one's in-laws on getting married and shows not in figure；Here, all to refer to
The axis of arc surface is the axis of the corresponding axis hole of side plate.
The utility model is located at higher-pressure region, transition region and low pressure on the basis of existing technology, by the outer peripheral surface of side plate
The diameter design of the part in area designs in this way at the form of stepped change, can be under the premise of fully ensuring that sealing performance, most
Limits expand higher-pressure region, i.e. expansion pressure oil cavity pressure guarantees the hydraulic of circumference of gear in the zone of action on circumference of gear
Dynamic balance greatly reduces gear force in radial, so that effectively improving gear oil pump uses the longevity under high temperature, high pressure, high speed
Life.
In one embodiment, R1-R2=0.21~0.32mm, R2-R3=1.15~1.35mm.Implementing the utility model
During, utility model people discovery guarantees the fluid pressure balance of circumference of gear using conditions above, reduces diameter suffered by gear
It is more preferable to power effect.
In one embodiment, R1=26.96~26.97mm, R2=26.65~26.75mm, R3=25.4~25.5mm.
During implementing the utility model, utility model people discovery using conditions above, that is, can guarantee that gear oil pump is effectively close
Envelope, also can effectively expande higher-pressure region, improve the fluid pressure balance of circumference of gear, while because side plate diametrical direction size reduces, just
In installation, reduce assembly difficulty, improves assembly efficiency.
In one embodiment, 301 side of inlet port on the gear joint surface of the side plate 30 and press oil port side have and let out
Lotus slot 302.
In one embodiment, 301 side of inlet port of the side plate 30 is provided with inlet port 301, and the gear of the side plate 30 connects
The outer rim of the drain charge slot 302 of 301 side of inlet port in conjunction face exceeds the inlet port 301.It designs in this way, inlet port side dumping lotus
302 aperture position of slot is greater than 301 edge of side plate inlet port, while capable of guaranteeing that 1~2 tooth seals in the gear pump course of work,
Expand oil sucting cavity, reach the fluid pressure balance for improving circumference of gear, reduces the effect of gear force in radial, also effectively increase
Service life of the gear oil pump under high temperature, high pressure, high speed.
In one embodiment, the pump housing joint surface of the side plate 30 be provided be centered around it is close in figure-three outside two axis holes
Seal installation groove 303.Sealing ring is installed in sealing ring installation groove 303, is sealed with this.
In one embodiment, two are provided in the higher-pressure region on the pump housing joint surface of the side plate 30 from the outer of the side plate 30
Circumferential surface extends to the oil groove 304 of the sealing ring installation groove 303, and two oil grooves 304 are located at the side plate 30
Upper and lower part.Oil groove 304 is arranged in higher-pressure region, in this way in gear pump in use, high pressure oil introducing sealing ring installation is recessed
Slot, one side pressure oil push axle sleeve floating is fitted closely with face of gear, reduce end clearance leak, another aspect pressure oil into
Enter sealing ring bottom oil groove, pushes sealing element to float, when making seal compression minimum, still guarantee its sealing performance.
Hereinafter, referring to Fig. 5 to Figure 12.
In one embodiment, the shell includes front cover, the pump housing and rear cover 20, and the front cover and the pump housing are integrated into
The entirety 10 that type structural member, the front cover and the pump housing are constituted is equipped with oil inlet 1010 and oil outlet 1011, the front cover
Pinion mounting holes 101, preceding driving gear shaft mounting hole 102, preceding driven gear shaft are equipped in whole 10 constituted with the pump housing
Mounting hole 103 and driving gear shaft seal mounting hole 104；
It is additionally provided with and the preceding driving gear shaft mounting hole 102, institute in the entirety 10 that the front cover and the pump housing are constituted
The preceding rank cavity road 105 that driven gear shaft mounting hole 103 is connected to the driving gear shaft seal mounting hole 104 before stating, it is described
Preceding rank cavity road 105 constituted by being provided with the front cover and the pump housing whole 10 in preceding oil return hole 106 and it is described into
Hydraulic fluid port 1010 is connected to.
The utility model uses the structure type of front cover and pump housing unitary design, on the one hand makes gear oil pump overall structure
It is more tight, effectively reduce axial dimension, save the cost, on the other hand, convenient for opening up preceding rank cavity road and preceding oil return hole.
The utility model designs above structure, gear oil pump in use, driving gear shaft installation before capable of making
Lubricating oil in hole, preceding driven gear shaft mounting hole enters DU bushing from higher-pressure region and is formed after lubricating oil film through by preceding rank cavity
Road and preceding oil return hole return to oil inlet, so constantly recycle, and play the role of good lubrication and cooling to DU bushing, fill
Dividing ensure that thermal balance of the gear oil pump under high temperature, high pressure, high speed conditions, while guarantee that the high pressure oil entered in oil sealing returns
Oil inlet prevents high pressure oil from damaging oil sealing.
In one embodiment, rear drive gear shaft mounting hole 201, rear driven gear shaft mounting hole are provided on the rear cover 20
202 and with the rear drive gear shaft mounting hole 201 and it is described after the rear rank cavity road that is connected to of driven gear shaft mounting hole 202
203, cavity road 203, which is held in the mouth, after described is connected to by the rear oil return hole 204 being provided in the rear cover 20 with the pinion mounting holes.
It designs in this way, also for said effect is reached, makes rear drive gear shaft mounting hole, the lubrication in rear driven gear shaft mounting hole
Oil liquid is held in the mouth cavity road oil return hole with after after entering DU bushing formation lubricating oil film from higher-pressure region after and returns to oil inlet, so not
Disconnected circulation plays the role of good lubrication and cooling to DU bushing.
In one embodiment, front cover and the pump housing constitute whole 10 in be additionally provided with and be connected to the oil inlet 1010
Oil inlet oil passage 107, the preceding oil return hole 106 are connected to the oil inlet oil passage 107, realize the preceding rank cavity with this
The connection in road 105 and the oil inlet 1010.This design, be suitable for oil inlet and oil outlet positional shift the case where, certainly
Also it is suitable for increasing fuel-displaced oil passage 108.
In one embodiment, it is provided with hydraulic fluid port 205 on the rear cover 20, so that the oil inlet and outlet connection multiplicity of gear pump
Change.
In one embodiment, the whole 10 front end outer peripheral surface that the front cover and the pump housing are constituted has outwardly extended in a radial direction two
A above convex block 109 is provided with mounting hole on the convex block 109.For installing gear oil pump.
In the utility model, pinion mounting holes, each driving gear shaft mounting hole, each driven gear shaft mounting hole, driving tooth
Wheel shaft seal mounting hole, oil inlet, oil outlet, oil inlet oil passage, fuel-displaced oil passage are wanted according to existing gear oil pump
It asks and opens up.
It should be understood that example as described herein and embodiment are not intended to limit the utility model only for explanation, this
Field technical staff can make various modifications or variation according to it, within the spirit and principle of the utility model, made
Any modification, equivalent substitution, improvement and etc. should be included within the scope of protection of this utility model.
Claims (10)
1. one kind can reduce the gear oil pump of gear force in radial, including shell, driving gear, driven gear, driving gear
Axis, driven gear shaft, be set on the driving gear shaft and the driven gear shaft two be fitted in the active respectively
The side plate of the both ends of the surface of gear and the driven gear, it is characterised in that：The portion positioned at low-pressure area of the outer peripheral surface of the side plate
It is divided into the arc surface of radius R1, the part positioned at higher-pressure region of the outer peripheral surface of the side plate is the arc surface of radius R3, wherein R1
> R3；
The part positioned at transition region of the outer peripheral surface of the side plate is the second level ladder circular arc that radius is followed successively by R3, R2 from inside to outside
Face, wherein R1 > R2 > R3.
2. the gear oil pump of gear force in radial can be reduced as described in claim 1, it is characterised in that：R1-R2=0.21
~0.32mm, R2-R3=1.15~1.35mm.
3. the gear oil pump of gear force in radial can be reduced as described in claim 1, it is characterised in that：R1=26.96~
26.97mm, R2=26.65~26.75mm, R3=25.4~25.5mm.
4. the gear oil pump for reducing gear force in radial as described in claims 1 or 2 or 3, it is characterised in that：The shell
Body includes front cover, the pump housing and rear cover, and the front cover and the pump housing are an integral molding structure part, the front cover and the pump housing structure
At be equipped with oil inlet and oil outlet on the whole, the front cover and the pump housing constitute it is whole in be equipped with pinion mounting holes, preceding
Driving gear shaft mounting hole, preceding driven gear shaft mounting hole and driving gear shaft seal mounting hole；
It is additionally provided with and the preceding driving gear shaft mounting hole, the preceding driven tooth in the entirety that the front cover and the pump housing are constituted
Cavity road is held in the mouth by being provided in the preceding rank cavity road that wheel shaft mounting hole is connected to the driving gear shaft seal mounting hole before described
The whole intracorporal preceding oil return hole that the front cover and the pump housing are constituted is connected to the oil inlet.
5. the gear oil pump of gear force in radial can be reduced as claimed in claim 4, it is characterised in that：The front cover and institute
It states and is additionally provided with the oil inlet oil passage being connected to the oil inlet, the preceding oil return hole and the oil inlet in the entirety of pump housing composition
The connection in preceding rank the cavity road and the oil inlet is realized in oil passage connection with this.
6. the gear oil pump of gear force in radial can be reduced as claimed in claim 4, it is characterised in that：It is covered out after described
Have rear drive gear shaft mounting hole, rear driven gear shaft mounting hole and with the rear drive gear shaft mounting hole and it is described after from
The rear rank cavity road of movable gear shaft mounting hole connection, it is described after rank cavity road by the rear oil return hole that is provided in the rear cover with
The pinion mounting holes connection.
7. the gear oil pump of gear force in radial can be reduced as claimed in claim 4, it is characterised in that：It is covered out after described
There is hydraulic fluid port.
8. the gear oil pump of gear force in radial can be reduced as claimed in claim 4, it is characterised in that：The front cover and institute
The whole front end outer peripheral surface for stating pump housing composition is outwardly extended in a radial direction there are two above convex block, is provided with mounting hole on the convex block.
9. the gear oil pump for reducing gear force in radial as described in claims 1 or 2 or 3, it is characterised in that：The side
The inlet port side and press oil port side on the gear joint surface of plate have drain charge slot.
10. the gear oil pump of gear force in radial can be reduced as claimed in claim 9, it is characterised in that：The side plate
Inlet port side is provided with inlet port, and the outer rim of the drain charge slot of the inlet port side on the gear joint surface of the side plate exceeds the suction
Hydraulic fluid port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820530576.2U CN208106744U (en) | 2018-04-13 | 2018-04-13 | A kind of gear oil pump reducing gear force in radial |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820530576.2U CN208106744U (en) | 2018-04-13 | 2018-04-13 | A kind of gear oil pump reducing gear force in radial |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208106744U true CN208106744U (en) | 2018-11-16 |
Family
ID=64117762
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820530576.2U Active CN208106744U (en) | 2018-04-13 | 2018-04-13 | A kind of gear oil pump reducing gear force in radial |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208106744U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108425838A (en) * | 2018-04-13 | 2018-08-21 | 合肥长源液压股份有限公司 | A kind of gear oil pump reducing gear force in radial |
-
2018
- 2018-04-13 CN CN201820530576.2U patent/CN208106744U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108425838A (en) * | 2018-04-13 | 2018-08-21 | 合肥长源液压股份有限公司 | A kind of gear oil pump reducing gear force in radial |
| CN108425838B (en) * | 2018-04-13 | 2024-03-19 | 合肥长源液压股份有限公司 | Gear oil pump capable of reducing radial force borne by gear |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102954194B (en) | Railway vehicle traveling gearbox sealing structure | |
| CN208106744U (en) | A kind of gear oil pump reducing gear force in radial | |
| CN107100991B (en) | Gear box | |
| CN203363617U (en) | Oil pump | |
| CN209349960U (en) | A kind of Lathe Spindle Box primary shaft belt pulley sealing structure | |
| CN108425838A (en) | A kind of gear oil pump reducing gear force in radial | |
| CN208106753U (en) | A kind of step gear oil pump side plate | |
| CN208845430U (en) | A kind of novel corrosion-resistant pump | |
| CN208294761U (en) | A kind of two-part gear oil pump shell | |
| CN212272832U (en) | Hydrostatic bearing sleeve | |
| CN201666377U (en) | Oil seal arranged between gear case body and shaft | |
| CN211481035U (en) | Motor casing, motor and vehicle | |
| CN210118441U (en) | Transmission and vehicle | |
| CN106949243A (en) | A kind of Novel hub unit inner seal ring | |
| CN103362853A (en) | Direct-connection centrifugal compressor and oil-return device thereof | |
| CN210935432U (en) | Bearing seat structure of centrifuge rotor | |
| CN202789509U (en) | Oil pump for automatic transmission of vehicle | |
| CN211398517U (en) | Lubricating structure of electric drive axle | |
| CN219035549U (en) | Cooling dynamic sealing structure for lubricating oil pump | |
| CN2533284Y (en) | Static pressure balanced rotary actuator | |
| CN217152980U (en) | Combined oil seal with external silt-proof lip | |
| CN209180347U (en) | Prevent the clutch of shaft end string oil | |
| CN217502533U (en) | A seal structure and vertical gear box for vertical gear box | |
| CN212804228U (en) | Double-seal ring waterproof sealing structure | |
| CN218844877U (en) | High-efficiency grease-leakage-proof rolling bearing |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |