CN110005815A - Sealing device, shaft assembly and bearing - Google Patents
Sealing device, shaft assembly and bearing Download PDFInfo
- Publication number
- CN110005815A CN110005815A CN201910207153.6A CN201910207153A CN110005815A CN 110005815 A CN110005815 A CN 110005815A CN 201910207153 A CN201910207153 A CN 201910207153A CN 110005815 A CN110005815 A CN 110005815A
- Authority
- CN
- China
- Prior art keywords
- primary seal
- seal lip
- lip
- sealing
- sealing device
- 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.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
- F16J15/3232—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/324—Arrangements for lubrication or cooling of the sealing itself
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3244—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with hydrodynamic pumping action
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3248—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports
- F16J15/3252—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports with rigid casings or supports
Abstract
The present invention relates to a kind of sealing device, shaft assembly and bearings.Sealing device, it is used for the sealing between shaft assembly or the first component and second component of bearing, sealing device includes skeleton (10) and sealing (20), sealing (20) includes the first primary seal lip (201) and dustproof lip (202) being connected to each other by transition part (203), dustproof lip (202) is than the first primary seal lip (201) by axially external, sealing (20) further includes the second primary seal lip (204), second primary seal lip (204) is from dustproof lip (202) or from transition part (203) towards radially inner side and extends simultaneously towards axially inner side and is used to contact sealing with first component formation.The possibility that sealing device according to the present invention improves sealing performance, reduces leakage in the case where the overall dimensions or space requirement without additionally increasing sealing device.
Description
Technical field
The present invention relates to field of sealing technology, relate more specifically to a kind of for shaft assembly or the sealing device of bearing, and tool
There are the shaft assembly and bearing of this sealing device.
Background technique
For shaft assembly or bearing, the first component for generally including to relatively rotate with respect to each other is (for example, shaft assembly
In axis or bearing inner ring) and second component (for example, outer ring of shell or bearing in shaft assembly), however at work may be used
It can need to be sealed between the two components, for this purpose, being equipped with sealing device between first component and second component.
In the prior art, following sealing device contra mandrel assembly or bearing is generallyd use to be sealed.The sealing device
Entirety is annular in shape and as shown in the partial sectional view of Fig. 1 comprising skeleton 10, sealing 20 and the spring fitted together
30。
Specifically, skeleton 10 is usually made of the hard material of such as metal and includes:
Skeleton axial component 101, the axial A approximately along sealing device extend and are used to be fixed on unshowned axis group
The outer ring of shell or bearing in part；
Skeleton coupling part 102, radial outside end (upside in Fig. 1) are outside with the axis of skeleton axial component 101
Side (left-hand end in Fig. 1) connection, skeleton coupling part 102 is from the axially external end of skeleton axial component 101 towards axially
Extend while outside extends towards radially inner side, the radially inner side end (lower side in Fig. 1) of skeleton coupling part 102 is under
The radial outside end for the skeleton radial component 103 stated connects；And
Skeleton radial component 103, from the radially inner side end of skeleton coupling part 102 along the radial R court of sealing device
Extend to radially inner side.
Further, sealing 20 attaches to skeleton 10, and primary attachment is in skeleton coupling part 102 and skeleton radial component
103.Sealing 20 include the axis extended to from the radially inner side end of skeleton radial component 103 in for example unshowned shaft assembly or
The primary seal lip 211 of the inner ring of bearing, primary seal lip 211 are connected to axis or bearing by being located at the spring 30 of its radial outside
Inner ring, spring 30 apply the spring force towards radially inner side to primary seal lip 211 always.In this way, primary seal lip 211 and axis or axis
The inner ring held realizes contact seal.
In addition, sealing 20 further includes prolonging from the inner ring of radially inner side end towards axis or the bearing of skeleton radial component 103
The dustproof lip 202 stretched, the dustproof lip 202 are located at the axially external of primary seal lip 211 and by transition part 203 and primary seal lips
211 connections, wherein have minim gap between the radially inner side end and axis or the inner ring of bearing of dustproof lip 202.In this way, dustproof lip
202 realize non-contacting seal with the inner ring of axis or bearing.
Sealing device with above structure is mainly used for industry and automotive system.For sealing system, leakage and
Abrasion be it is especially noted that the problem of.In the case where most of seal failures, leak or by caused leakage is seriously worn
It is main failure cause.
Summary of the invention
Defect based on the above-mentioned prior art is made that the present invention.The purpose of the present invention is to provide a kind of sealing device,
Sealing performance can be improved in the case where the overall dimensions or space requirement without additionally increasing sealing device, reduce leakage
It may.Another object of the present invention is to provide a kind of shaft assembly and bearing including the sealing device.
In order to achieve the above-mentioned object of the invention, the present invention can adopt the following technical scheme that.
The present invention provides a kind of sealing device, is used for close between shaft assembly or the first component and second component of bearing
Envelope, the first component can rotate relative to the second component, the sealing device it is whole annular in shape and including skeleton with
Sealing, wherein the sealing includes the first primary seal lip and dustproof lip being connected to each other by transition part, and described first is main
Sealing lip extends towards radially inner side and is used for and the first component shape while extension from the skeleton towards axially inner side
It is sealed at contact, the dustproof lip extends from the skeleton towards while axially external extension towards radially inner side, wherein institute
Dustproof lip is stated than first primary seal lip by axially external, which is characterized in that
The sealing further includes the second primary seal lip, and second primary seal lip is from the dustproof lip or from the transition part
Extend towards radially inner side and simultaneously towards axially inner side and be used to be formed with the first component and contacts sealing.
In at least one embodiment, second primary seal lip is from the dustproof lip or from the transition part towards diameter
Extend inwardly and simultaneously towards axially inner side arc, second primary seal lip is relative to first primary seal lip or phase
There is elongated configuration for the dustproof lip.
In at least one embodiment, the thickness of second primary seal lip radially is less than first primary seal lip
Thickness radially, and the thickness of second primary seal lip is less than the thickness of the dustproof lip.
In at least one embodiment, the axial cross section of second primary seal lip integrally has radially inside protrusion
Curved profile.
In at least one embodiment, it is provided in the inner peripheral surface of second primary seal lip towards radial outside and is recessed
Multiple pumping passages.
In at least one embodiment, the inner peripheral surface of second primary seal lip has multiple raised lines.
In at least one embodiment, the raised line tilts with respect to the circumferential direction, thus in second primary seal lip
Inner peripheral surface forms helicitic texture on the whole.
In at least one embodiment, in the outer of the inner peripheral surface of first primary seal lip and second primary seal lip
It is formed with annular space between circumferential surface, is stored with lubricant in the annular space.
The present invention also provides a kind of shaft assemblies comprising axis, shell and is mounted between the axis and the shell
Sealing device according to the present invention.
The present invention also provides a kind of bearings comprising inner ring, outer ring and is mounted between the inner ring and the outer ring
Sealing device according to the present invention.
The second primary seal lip for contacting sealing, energy are formed with first component (for example, inner ring of axis or bearing) by being arranged
It is enough not influencing the first primary seal lip and mentioned in the case where the overall dimensions or space requirement of no additionally increase sealing device
High sealing performance, the possibility for reducing leakage.
Detailed description of the invention
Fig. 1 is a kind of partial schematic sectional view of the sealing device of prior art.
Fig. 2 is the partial schematic sectional view of sealing device according to the first embodiment of the present invention.
Fig. 3 is the partial schematic sectional view of sealing device according to the second embodiment of the present invention.
Fig. 4 is the partial schematic sectional view of sealing device according to the third embodiment of the present invention.
Description of symbols
10 skeleton, 101 skeleton axial component, 102 skeleton coupling part, 103 skeleton radial component, 20 sealing
201 first primary seal lip, 202 dustproof lip, 203 204 second primary seal lip of transition part, 205 pumping passage, 206 raised line
211 primary seal lip, 30 contact site spring A axial direction R radial direction C circumferential direction G S annular space.
Specific embodiment
Carry out the specific embodiment that the present invention will be described in detail hereinafter with reference to Figure of description of the invention.Of the invention is close
The global shape of seal apparatus is annular.Unless otherwise specified, illustrated " axial direction ", " radial direction " in the following specific embodiments
" circumferential direction " refers respectively to the axial direction, radially and circumferentially of the sealing device.In addition, in the following specific embodiments, axis is outside
Side (ambient side) is the left side in each attached drawing, and axially inner side (by sealed sides/lubricant side/oil side) is the right side in each attached drawing；
Radial outside is the upside in each attached drawing, and radially inner side is the downside in each attached drawing.
It will be described below multiple illustrative embodiments according to the present invention.
(first embodiment)
In the present embodiment, as shown in Fig. 2, the sealing device includes skeleton 10 and sealing 20, preferably also there is bullet
Spring 30, wherein sealing 20 attaches to skeleton 10.Skeleton 10 is preferably made of the hard material such as metal, sealing
20 are preferably made of the elastic material such as rubber.
The knot of the skeleton 10 of the sealing device of the prior art shown in the structure and Fig. 1 of skeleton 10 in present embodiment
Structure is identical.As shown in Fig. 2, the skeleton 10 includes the skeleton axial component 101 that A extends generally along an axial, from skeleton axial part
Skeleton coupling part 102 that points 101 axially external end extends and from the radially inner side end of skeleton coupling part 102 along diameter
The skeleton radial component 103 extended to R towards radially inner side.
The sealing 20 of the sealing device of the prior art shown in the structure and Fig. 1 of sealing 20 in present embodiment
Structure division it is identical.As shown in Fig. 2, in the present embodiment, 20 primary attachment of sealing is in skeleton coupling part 102 and bone
Frame radial component 103.Sealing 20 includes extending to be used in combination towards radially inner side while extension from skeleton 10 towards axially inner side
In the first primary seal lip 201 contacted with the inner ring of axis or bearing in shaft assembly and from skeleton 10 towards axially external extension
The dustproof lip 202 extended simultaneously towards radially inner side.First primary seal lip 201 can by spring 30 from shaft assembly axis or
The radial outside of the inner ring of bearing is connected to the inner ring of axis or bearing, and spring 30 applies direction to the first primary seal lip 201 always
The spring force of radially inner side.202 to the first primary seal lip 201 of dustproof lip is leaned on axially external and passes through transition part 203 and first
Primary seal lip 201 connects.
However, in the present embodiment, sealing 20 is also additional to have the second master other than the first primary seal lip 201
Sealing lip 204, second primary seal lip 204 are prolonged from 202 arc of dustproof lip towards radially inner side and simultaneously towards axially inner side
It stretches.Instead, although it is not shown, the second primary seal lip 204 can also from 203 arc of transition part towards radially inner side and simultaneously
Extend towards axially inner side.As may be appreciated in the cross-sectional view of figure 2, the second primary seal lip 204 has thin relative to the first primary seal lip 201
Long configuration, also that is, thickness of the thickness much smaller than the first primary seal lip 201 radially R of the second primary seal lip 204 radially R,
And thickness of second primary seal lip 204 along the length of axial A much larger than its own radially R.Preferably, the second primary seal lip
204 also have elongated configuration relative to dustproof lip 202, also that is, the thickness of the second primary seal lip 204 is less than dustproof lip 202
Thickness, and the length of the second primary seal lip 204 is greater than the length of dustproof lip 202.It should be appreciated that the second master in the application is close
The elongated configuration of envelope lip 204 refers to that its axial cross section has elongated configuration.Second primary seal lip 204, the first primary seal lip
201 and the thickness and length of dustproof lip 202 be also the thickness measured in the axial cross section of sealing device and length.
Since the second primary seal lip 204 has elongated configuration, it is preferably greater than with the amount of interference of axis or the inner ring of bearing
The amount of interference of first primary seal lip 201 and axis or the inner ring of bearing.Due to not being that spring is arranged in the second primary seal lip 204, thus,
Although the second primary seal lip 204 and the amount of interference of axis or the inner ring of bearing are larger, the contact of itself and axis or the inner ring of bearing
Pressure still can be controlled rationally, to be not likely to produce big abrasion.
It is appreciated that the second primary seal lip 204 mentioned herein can refer to the amount of interference of axis or the inner ring of bearing, second
The part of primary seal lip 204 contacted with the inner ring of axis or bearing, from be not mounted to the nature of shaft assembly or bearing to
It is installed to maximum deformation quantity/shift amount on radial R of the installation condition of shaft assembly or bearing.First master mentioned herein is close
Envelope lip 201 can refer to that with the amount of interference of axis or the inner ring of bearing, the first primary seal lip 204 is contacted with the inner ring of axis or bearing
It is partial, from being not mounted to shaft assembly or bearing and not by the nature of the spring force of spring 30 to being installed to shaft assembly or axis
Maximum deformation quantity/the shift amount on radial R for the installation condition held.
Preferably, the axial cross section of the second primary seal lip 204 integrally has the curved profile that radially inside is protruded.Relatively
In the contact site G for the tip-angled shape that the radially inner side face of the first primary seal lip 201 is contacted with the inner ring of such as axis or bearing,
Two primary seal lips 204 have easily deformable characteristic based on this elongated and configuration with arc, even if without spring etc. pair
It, which applies external force and also can be realized it, biggish interference and then generates biggish contact for example between axis or the inner ring of bearing
Power, to realize that better seal acts on.By the way that the second primary seal lip is extraly arranged in dustproof lip 202 or transition part 203
204, can will not influence the first primary seal lip 201 and without additionally increase sealing device overall dimensions or space requirement
In the case where improve sealing performance, substantially reduce the possibility of leakage.
(second embodiment)
As shown in figure 3, the basic structure of sealing device according to the present embodiment and sealing according to first embodiment
The basic structure of device is identical, their difference includes: in sealing device according to the present embodiment, additionally second
Be provided with multiple pumping passages 205 in primary seal lip 204, pumping passage 205 can be configured to strip, triangle, rectangle or
Trapezoidal recess portion.Particularly, pumping passage 205 is arranged on the inner peripheral surface of the second primary seal lip 204.
Pumping effect can be generated to the fluid of such as grease and air etc. by being equipped with pumping passage 205, to pass through
These fluids make 204 rapid cooling of the second primary seal lip.In this way, sealing device of the invention improves the second primary seal lip
204 radiating efficiency reduces the temperature of the second primary seal lip 204, improves the profit of the contact site of the second primary seal lip 204
Sliding state, and then improve the service life of entire sealing device.
In an optional embodiment, pumping passage 205 can will be from the first primary seal lip 201 and the second primary seal
The leakage of lip 204 or the lubricant pump that will be leaked send the axially inner side (lubricant side/oil side) of sealing device back to, this can be improved
Prevent the effect of lubricant leakage.
As shown in figure 3, between the first primary seal lip 201 and the second primary seal lip 204, more specifically, close in the first master
It seals between the inner peripheral surface of lip 201 and the outer peripheral surface of the second primary seal lip 204 and is formed with annular space S.It is installed in the sealing device
In the case where shaft assembly or bearing, annular space S is closed.The lubricants such as grease can be placed in annular space S,
The lubricant can play lubricating action to especially the first primary seal lip 201 and the second primary seal lip 204.
It should be appreciated that in the case where the sealing device is installed on shaft assembly or bearing, although the second primary seal lip 204 to
Radial outside deformation/displacement, still, second primary seal lip 204 will not be contacted with the first primary seal lip 201, thus, second is main
Gap between the distal portion of sealing lip 204 and the first primary seal lip 201 allows the lubricant in annular space S to lubricate first
Primary seal lip 201 and the second primary seal lip 204.
As shown in figure 3, pumping passage 205 is set to the inner peripheral surface of the distal portion of the second primary seal lip 204 and can be opposite
Obliquely extend in axial A.Particularly, pumping passage 205 extends to the end of the distal portion of the second primary seal lip 204, thus
More easily realize to from the first primary seal lip 201 leak or be stored between the first primary seal lip 201 and the second primary seal lip 204
Annular space S in lubricant pumping effect.
It should be appreciated that there is also corresponding annular space in first embodiment and aftermentioned third embodiment,
It also can store lubricant in these annular spaces.
(third embodiment)
As shown in figure 4, the basic structure of sealing device according to the present embodiment and the first and second embodiments is close
The basic structure of seal apparatus is identical, their difference includes: in sealing device according to the present embodiment, and the second master is close
The inner peripheral surface for sealing lip 204 has multiple raised lines 206.
In the present embodiment, as shown in figure 4, the second primary seal lip 204 is configured with multiple raised lines in inner circumferential surface
206, C (being represented by dashed line in Fig. 4) is tilted these raised lines with respect to the circumferential direction, thus in the inner peripheral surface of the second primary seal lip 204
Helicitic texture is formed on the whole, which may be implemented effect identical with above-mentioned pumping passage 205, and can be real
Now acted on the inner ring better seal of axis or bearing.
In addition, the present invention also provides shaft assemblies or bearing including above-mentioned sealing device.The skeleton 10 of the sealing device
The outer ring of the outer ring of the shell or bearing that are fixed in shaft assembly, the shell or bearing can not rotate.
Although the specific technical solution of the present invention is set forth in the above specific embodiment, also need
Illustrate:
(1) although not clearly stated in above-mentioned specific embodiment it should be appreciated that sealing according to the present invention
Device can also include dust ring, which is used to be fixed on the inner ring of axis or bearing and forms sealing space with skeleton, from
And sealing device according to the present invention is made to become cartridge seal device.
(2) although being illustrated in above-mentioned specific embodiment in the second primary seal lip 204 and such as axis or bearing
Circle contact, but the invention is not restricted to this.Second primary seal lip 204 can also be contacted for example with above-mentioned dust ring.
(3) opening shape that pumping passage 205 is illustrated in above-mentioned specific embodiment is triangle, rectangle or ladder
The side of the shapes such as shape, these shapes can not be straight line.
(4) second primary seal lips 204 can be by the material identical or different with the first primary seal lip 201 and/or dustproof lip 202
Material is made.For example, the second primary seal lip 204 can be by rubber, the plastics of such as PTFE (polytetrafluoroethylene (PTFE)) or other self-lubricatings
One of material or multiple material are made.
Claims (10)
1. a kind of sealing device, the sealing being used between shaft assembly or the first component and second component of bearing, described first
Component can be rotated relative to the second component, and the sealing device is whole annular in shape and including skeleton (10) and sealing
(20), wherein the sealing (20) includes the first primary seal lip (201) being connected to each other by transition part (203) and dust-proof
Lip (202), towards radially inner side while first primary seal lip (201) extends from the skeleton (10) towards axially inner side
Extend and be used to be formed with the first component and contact sealing, the dustproof lip (202) is outside towards axis from the skeleton (10)
Extend while side extends towards radially inner side, wherein the dustproof lip (202) leans on axis than first primary seal lip (201)
Outward, which is characterized in that
The sealing (20) further includes the second primary seal lip (204), and second primary seal lip (204) is from the dustproof lip
(202) or extend from the transition part (203) towards radially inner side and simultaneously towards axially inner side and be used for and first structure
Part forms contact sealing.
2. sealing device according to claim 1, which is characterized in that second primary seal lip (204) is from described dust-proof
Lip (202) extends from the transition part (203) towards radially inner side and simultaneously towards axially inner side arc, and described second is main
Sealing lip (204) has elongated configuration relative to first primary seal lip (201) or relative to the dustproof lip (202).
3. sealing device according to claim 2, which is characterized in that second primary seal lip (204) is radially (R)
Thickness is less than the thickness of first primary seal lip (201) radially (R), and the thickness of second primary seal lip (204)
Less than the thickness of the dustproof lip (202).
4. sealing device according to any one of claim 1 to 3, which is characterized in that second primary seal lip (204)
Axial cross section integrally have radially inside protrude curved profile.
5. sealing device according to any one of claim 1 to 3, which is characterized in that in second primary seal lip
(204) inner peripheral surface is provided with the multiple pumping passages (205) being recessed towards radial outside.
6. sealing device according to any one of claim 1 to 3, which is characterized in that second primary seal lip (204)
Inner peripheral surface have multiple raised lines (206).
7. sealing device according to claim 6, which is characterized in that the raised line (206) tilts with respect to the circumferential direction (C),
To which the inner peripheral surface in second primary seal lip (204) forms helicitic texture on the whole.
8. sealing device according to any one of claim 1 to 3, which is characterized in that in first primary seal lip
(201) it is formed with annular space (S) between the outer peripheral surface of inner peripheral surface and second primary seal lip (204), in annular sky
Between be stored with lubricant in (S).
9. a kind of shaft assembly, which is characterized in that the shaft assembly include axis, shell and be mounted on the axis and the shell it
Between sealing device according to any one of claim 1 to 8.
10. a kind of bearing, which is characterized in that the bearing includes inner ring, outer ring and is mounted on the inner ring and the outer ring
Between sealing device according to any one of claim 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910207153.6A CN110005815A (en) | 2019-03-19 | 2019-03-19 | Sealing device, shaft assembly and bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910207153.6A CN110005815A (en) | 2019-03-19 | 2019-03-19 | Sealing device, shaft assembly and bearing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110005815A true CN110005815A (en) | 2019-07-12 |
Family
ID=67167308
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910207153.6A Pending CN110005815A (en) | 2019-03-19 | 2019-03-19 | Sealing device, shaft assembly and bearing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110005815A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111322079A (en) * | 2020-02-28 | 2020-06-23 | 浙江鼎昊新能源设备股份有限公司 | Shield machine front shield with good self-lubricating effect |
-
2019
- 2019-03-19 CN CN201910207153.6A patent/CN110005815A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111322079A (en) * | 2020-02-28 | 2020-06-23 | 浙江鼎昊新能源设备股份有限公司 | Shield machine front shield with good self-lubricating effect |
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Application publication date: 20190712 |