CN106050909B - A kind of needle roller bushing and its auxiliary assembling structure - Google Patents
A kind of needle roller bushing and its auxiliary assembling structure Download PDFInfo
- Publication number
- CN106050909B CN106050909B CN201610664010.4A CN201610664010A CN106050909B CN 106050909 B CN106050909 B CN 106050909B CN 201610664010 A CN201610664010 A CN 201610664010A CN 106050909 B CN106050909 B CN 106050909B
- Authority
- CN
- China
- Prior art keywords
- needle roller
- auxiliary
- bushing
- inner sleeve
- auxiliary dress
- 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.)
- Expired - Fee Related
Links
- 238000009434 installation Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 230000001681 protective effect Effects 0.000 abstract description 2
- 239000002184 metal Substances 0.000 description 9
- 239000004033 plastic Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 239000000725 suspension Substances 0.000 description 7
- 239000003921 oil Substances 0.000 description 4
- 230000000703 anti-shock Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 239000010687 lubricating oil Substances 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
- F16C19/44—Needle bearings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G7/00—Pivoted suspension arms; Accessories thereof
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rolling Contact Bearings (AREA)
Abstract
The present invention relates to a kind of needle roller bushing and its auxiliary assembling structure of needle roller bushing, wherein needle roller bushing includes multiple needle rollers, two end retainer rings;Multiple needle roller movably arrangeds are between two end retainer rings;Needle roller includes the hemisphere at the both ends of cylindrical needle roller body and cylindrical needle roller body;The surface of each end retainer ring towards needle roller is provided with a circle groove;Hemisphere is movably set in groove.The needle roller bushing of the present invention can significantly reduce frictional force during relative motion, improve mechanical efficiency, performance and reliability, and reduce energy consumption.The auxiliary assembling structure of needle roller bushing of the application, that is, can assist in the assembling of needle roller bushing, and fixed protective effect can be also played in transportation.
Description
Technical field
The invention belongs to bushing technical field, particularly relates to a kind of needle roller bushing and its auxiliary assembling structure.
Background technology
Widely use bushing in automobile or other machineries, the function of bushing is also different in different structure, and some plays rotation
Turn wear-resistant effect, some plays rotation and flexible anti-shock effect.
Bearing inner race rotates with outer ring relative to certain speed, and bushing is different from bearing, outside the part and bushing on the inside of bushing
The part of side is in certain angle scope internal rotation.Fig. 1 is automobile front axle part-structure schematic diagram, including hub assembly 01, knuckle
02nd, outer bearing 03, inner bearing 04, lower bushing 05, drag link ball pin 06, I-beam 07, knuckle arm 08, stub 09 and upper bushing
010;Upper bushing and lower bushing 5 between knuckle and stub therein just play the rotation of knuckle and wear-resisting effect.
Rubber bushing in automotive suspension is exactly to play certain rotation and flexible anti-shock effect, but with the development of technology
More and more higher is required with user, the also more and more higher of the requirement to the performance of bushing.Therefore, through there is technology to provide suspension swing arm
In bushing not only act as rotation and flexible anti-shock effect, and reduce the frictional force of suspension lower swing arm motion, improve suspension
Performance.
Equally also require that the bushing in Fig. 1 reduces its rotating friction force, straight trip property and return performance when improving wheels travel.
Upper bushing and lower bushing in Fig. 1 are metal lining, including individual layer bushing and double-deck bushing;Wherein double-deck bushing
As shown in Figures 2 and 3, including bushing outer layer 101, bushing internal layer 102, oil groove 103 and tank filler sleeve 104;Pass through tank filler sleeve plus profit
Lubricating oil, lubricating oil flow to the inner side each several part of bushing internal layer by oil groove and rotary motion, play a part of lubrication and reduce friction.
In spite of oil lubrication, but the coefficient of friction between bushing and revolving part is still larger, influences mechanical performance.
As shown in figure 4, it is a kind of bushing with sliding bearing, it is possible to increase the rotation of the bushing in suspension swing arm and soft
Property antihunt action, and reduce the frictional force of suspension lower swing arm motion, improve the performance of suspension.The bushing include metal inner cylinder 012,
Metal outer cylinder 011, rubber layer 013, short plastic sleeve 014 and long plastic sleeve 015;Rubber layer vulcanizes in metal inner cylinder and metal
Between outer barrel;Two short plastic sleeves are arranged at the inner surface of metal inner cylinder;Long plastic sleeve is arranged at the interior of short plastic sleeve
Surface;Short plastic sleeve plays a part of sliding bearing jointly with long plastic sleeve.
Although sliding friction relative to the existing bushing frictional force of in general very little, relative rolling friction still compared with
Greatly, and this bushing bearing capacity it is poor, be not suitable with big load without rotary motion in flexible structural member.
The content of the invention
It is big to solve the frictional force of existing bushing it is an object of the invention to provide a kind of needle roller bushing and its auxiliary assembling structure, and
The problem of bearing capacity of bushing is not high.
It is a further object of the present invention to provide the auxiliary assembling structure of bushing, it is easy to the installation of needle roller bushing.
The present invention is achieved by the following technical solutions:
A kind of needle roller bushing, including multiple needle rollers, two end retainer rings;Multiple needle roller movably arrangeds are in two
Between the end retainer ring;
The needle roller includes the hemisphere at the both ends of cylindrical needle roller body and cylindrical needle roller body;
The surface of each end retainer ring towards the needle roller is provided with a circle groove;The hemisphere activity is set
In in the groove.
The structure of two end retainer rings is identical.
The cross section of the groove is arc.
The diameter of the needle roller is more than the width of the end retainer ring.
A kind of auxiliary assembling structure of needle roller bushing, including auxiliary dress outer sleeve, auxiliary dress inner sleeve and snap ring;
The auxiliary dress outer sleeve includes outer sleeve body, and the annulus that radially extends of one end of the outer sleeve body
Face;
The auxiliary dress inner sleeve includes inner sleeve body, and described inner sleeve body one end is provided with along the inner sleeve body
Radially extend one circle dentation coming to an end, the other end of the inner sleeve body is provided with U-shaped neck;
The auxiliary dress inner sleeve inserts the auxiliary dress overcoat from auxiliary dress outer sleeve one end relative with the anchor ring
In cylinder;
Needle roller bushing described in any of the above-described is arranged between the auxiliary dress outer sleeve and the auxiliary dress inner sleeve;
The snap ring is stuck in the U-shaped neck, for by the needle roller bushing, the auxiliary dress outer sleeve and auxiliary dress
Inner sleeve is fixedly connected.
The maximum outside diameter of the dentation coming to an end is more than the internal diameter of the outer sleeve body.
Plane where the U-shaped neck is parallel with the anchor ring.
The installation method of the auxiliary assembling structure of needle roller bushing, its step are:
One end retainer ring is attached on the auxiliary dress inner sleeve using tooling device, needle roller is mounted side by side in described
The surrounding of auxiliary dress inner sleeve, and one end of the needle roller is butted on the groove of the end retainer ring, then by another end
Retaining ring set is attached on the auxiliary dress inner sleeve, and the other end of the needle roller is butted on the groove of the end retainer ring;
The snap ring is stuck in the U-shaped neck so that the needle roller bushing is fixed on the auxiliary dress inner sleeve;
The auxiliary dress outer sleeve is placed on the needle roller bushing, completes the assembling of the auxiliary assembling structure of needle roller bushing.
The beneficial effects of the invention are as follows:
Frictional force when the needle roller bushing of the present invention can significantly reduce relative motion, improve mechanical efficiency, performance and can
By property, and reduce energy consumption.
The auxiliary assembling structure of needle roller bushing of the application, that is, can assist in the assembling of needle roller bushing, also can be in transportation
Play fixed protective effect.
Brief description of the drawings
Fig. 1 is prior art automobile front axle part-structure schematic diagram;
Fig. 2 is the top view of prior art bilayer bushing;
Fig. 3 is Fig. 2 A-A sectional views;
Fig. 4 is the bushing schematic diagram with sliding bearing;
Fig. 5 is the top view of needle roller bushing of the present invention;
Fig. 6 is Fig. 5 B-B sectional views;
Fig. 7 is enlarged drawing at Fig. 5 C;
Fig. 8 is the auxiliary assembling structure schematic diagram of needle roller bushing of the present invention;
Fig. 9 is enlarged drawing at Fig. 8 D;
Figure 10 is enlarged drawing at Fig. 8 E;
Figure 11 is process schematic in needle roller bushing load hole;
Figure 12 is that axle loads needle roller bushing internal procedure schematic diagram;
Figure 13 is the schematic diagram after the completion of the assembling of needle roller bushing;
Inner sleeve structure schematic diagram is filled supplemented by Figure 14.
Description of reference numerals
01 hub assembly, 02 knuckle, 03 outer bearing, 04 inner bearing, 05 time bushing, 06 drag link ball pin, 07
I-beam, 08 knuckle arm, 09 stub, 010 upper bushing, 101 bushing outer layers, 102 bushing internal layers, 103 oil grooves, 104
Tank filler sleeve, 011 metal outer cylinder, 012 metal inner cylinder, 013 rubber layer, 014 short plastic sleeve, 015 long plastic sleeve, 1
Needle roller, 2 end retainer rings, 3 end retainer rings, 4 auxiliary dress outer sleeves, 5 auxiliary dress inner sleeves, 6 snap rings, 7 mounting holes, 8 turns
Moving axis, 9 blind flanges, 31 grooves, 41 outer sleeve bodies, 42 anchor rings, 51 inner sleeve bodies, 52 tooth form coming to an ends, 53 U
Shape neck.
Embodiment
Describe technical scheme in detail by the following examples, following embodiment be only it is exemplary, only
Explanation and illustration technical scheme can be used for, and be not to be construed as the limitation to technical solution of the present invention.
The present invention provides a kind of needle roller bushing, as shown in Fig. 5 to Figure 14, including 1, two end retainer ring of multiple needle rollers
(2,3);Multiple movably arrangeds of needle roller 1 are between two end retainer rings.
Needle roller 1 includes the hemisphere at the both ends of cylindrical needle roller body and cylindrical needle roller body;Cylindrical needle roller body
With higher cylindricity, the precision of ball in bearing can be reached substantially;The both ends of needle roller are hemisphere, for reducing and holding
The frictional force of portion's retaining ring;There is small gap between two neighboring needle roller, after needle roller loads end retainer ring, in needle roller
Surrounding scribbles lubricant grease.
The surface of each end retainer ring towards needle roller is provided with a circle groove 31;Hemisphere is movably set in groove.
The cross section of groove 31 is arc.Play fixed and spacing effect.
The diameter of needle roller 1 is more than the width of end retainer ring.In this application, the inner side of needle roller is than on the inside of end retainer ring
High 0.3mm, the outside of needle roller is than high 0.3mm on the outside of the protection ring of end, to prevent end retainer ring from being contacted with hole and axle.
The structure of two end retainer rings is identical.
A kind of auxiliary assembling structure of needle roller bushing, including auxiliary dress outer sleeve 4, auxiliary dress inner sleeve 5 and snap ring 6.
Auxiliary dress outer sleeve 4 includes outer sleeve body 41, and the anchor ring 42 that radially extends of one end of outer sleeve body 41.
Auxiliary dress inner sleeve 5 includes inner sleeve body 51, and inner sleeve body one end, which is provided with along the radial direction of inner sleeve body, prolongs
The circle tooth form coming to an end 52 stretched, the other end of inner sleeve body 51 is provided with U-shaped neck 53;The place plane of U-shaped neck 53 and circle
Anchor ring is parallel.The maximum outside diameter of tooth form coming to an end 52 is more than the internal diameter of outer sleeve body.
Auxiliary dress inner sleeve 5 is from the auxiliary dress outer sleeve 4 one end insertion auxiliary dress outer sleeve 4 relative with anchor ring.
The needle roller bushing of any of the above-described is arranged between auxiliary dress outer sleeve and auxiliary dress inner sleeve;
Snap ring 6 is stuck in U-shaped neck 53, for needle roller bushing, auxiliary dress outer sleeve and auxiliary dress inner sleeve to be fixedly connected.
Snap ring 6 is ring, and the opening of an insertion is provided with snap ring, is easy to snap ring being caught in U-shaped neck, also just
In taking out snap ring out of U-shaped neck.
The installation method of the auxiliary assembling structure of needle roller bushing, its step are:
One end retainer ring 3 is attached on auxiliary dress inner sleeve 5 using tooling device, 1 pin of rolling is mounted side by side in auxiliary dress
The surrounding of inner sleeve 5, and one end of needle roller is butted on the groove of end retainer ring, then 2 sets of another end retainer ring is attached to auxiliary
Fill on inner sleeve, and the other end of needle roller is butted on the groove of end retainer ring;
Snap ring is stuck in U-shaped neck so that needle roller bushing is fixed on auxiliary dress inner sleeve;
Auxiliary dress outer sleeve is placed on needle roller bushing, completes the assembling of the auxiliary assembling structure of needle roller bushing.
When being assembled, first remove snap ring, one end that auxiliary dress outer sleeve is provided with anchor ring is directed at mounting hole 7, used
In being pressed in auxiliary dress inner sleeve end, by needle roller bushing and auxiliary dress inner sleeve press-in mounting hole, now, auxiliary dress outer sleeve is supported
Fall;
The left side of end retainer ring is pushed down through dentation coming to an end, rotary shaft is directed at mounting hole 7, the end of rotary shaft 8
Peak on auxiliary dress inner sleeve, rotary shaft is pressed into needle roller bushing, while auxiliary dress inner sleeve is supported out, load onto blind flange 9, use spiral shell
Bolt is fixed, and completes the installation of needle roller bushing.
Using draw point force of rolling friction very little, intensity is high, wearability is good the features such as, to improve existing metal lining because of resistance
Big the problem of influenceing mechanical performance, while improve the reliability of bushing.
Although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of changes, modification can be carried out to these embodiments, replace without departing from the principles and spirit of the present invention by understanding
And deformation, the scope of the present invention are extremely equally limited by appended claims.
Claims (7)
- A kind of 1. auxiliary assembling structure of needle roller bushing, it is characterised in that:Including auxiliary dress outer sleeve, auxiliary dress inner sleeve and snap ring;The auxiliary dress outer sleeve includes outer sleeve body, and the anchor ring that radially extends of one end of the outer sleeve body;The auxiliary dress inner sleeve includes inner sleeve body, and described inner sleeve body one end is provided with along the footpath of the inner sleeve body Dentation coming to an end is enclosed to the one of extension, the other end of the inner sleeve body is provided with U-shaped neck;The auxiliary dress inner sleeve is from the auxiliary dress outer sleeve one end insertion relative with the anchor ring auxiliary dress outer sleeve;Needle roller bushing includes multiple needle rollers, two end retainer rings;Multiple needle roller movably arrangeds are in two ends Between retaining ring;The needle roller includes the hemisphere at the both ends of cylindrical needle roller body and cylindrical needle roller body;The surface of each end retainer ring towards the needle roller is provided with a circle groove;The hemisphere is movably set in institute State in groove;The needle roller bushing is arranged between the auxiliary dress outer sleeve and the auxiliary dress inner sleeve;The snap ring is stuck in the U-shaped neck, for by the needle roller bushing, the auxiliary dress outer sleeve and auxiliary dress inner sleeve Cylinder is fixedly connected.
- 2. the auxiliary assembling structure of needle roller bushing according to claim 1, it is characterised in that:The structure of two end retainer rings It is identical.
- 3. the auxiliary assembling structure of needle roller bushing according to claim 1, it is characterised in that:The cross section of the groove is arc.
- 4. the auxiliary assembling structure of needle roller bushing according to claim 1, it is characterised in that:The diameter of the needle roller is more than the end The width of portion's retaining ring.
- 5. the auxiliary assembling structure of needle roller bushing according to claim 1, it is characterised in that:The maximum outside diameter of the dentation coming to an end is big In the internal diameter of the outer sleeve body.
- 6. the auxiliary assembling structure of needle roller bushing according to claim 1, it is characterised in that:Plane and institute where the U-shaped neck It is parallel to state anchor ring.
- 7. the auxiliary assembling structure of needle roller bushing according to claim 1, it is characterised in that:The installation side of the auxiliary assembling structure of needle roller bushing Method, its step are:One end retainer ring is attached on the auxiliary dress inner sleeve using tooling device, needle roller is mounted side by side in the auxiliary dress The surrounding of inner sleeve, and one end of the needle roller is butted on the groove of the end retainer ring, then another described end is kept Ring set is attached on the auxiliary dress inner sleeve, and the other end of the needle roller is butted on the groove of the end retainer ring;The snap ring is stuck in the U-shaped neck so that the needle roller bushing is fixed on the auxiliary dress inner sleeve;The auxiliary dress outer sleeve is placed on the needle roller bushing, completes the assembling of the auxiliary assembling structure of needle roller bushing.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201610664010.4A CN106050909B (en) | 2016-08-12 | 2016-08-12 | A kind of needle roller bushing and its auxiliary assembling structure |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201610664010.4A CN106050909B (en) | 2016-08-12 | 2016-08-12 | A kind of needle roller bushing and its auxiliary assembling structure |
Publications (2)
Publication Number | Publication Date |
---|---|
CN106050909A CN106050909A (en) | 2016-10-26 |
CN106050909B true CN106050909B (en) | 2018-04-06 |
Family
ID=57481308
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN201610664010.4A Expired - Fee Related CN106050909B (en) | 2016-08-12 | 2016-08-12 | A kind of needle roller bushing and its auxiliary assembling structure |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN106050909B (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102016121131B4 (en) * | 2016-11-04 | 2019-07-11 | Benteler Automobiltechnik Gmbh | Suspension system with a handlebar |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2815078A1 (en) * | 1978-04-07 | 1979-10-18 | Schaeffler Ohg Industriewerk | Needle roller bearing fitting case - comprises outer sleeve with internal flange fitting over longer inner one inserted into housing |
FR2568328B1 (en) * | 1984-07-30 | 1987-01-23 | Nadella | NEEDLE BEARING, IN PARTICULAR NEEDLE SOCKET WITH REINFORCED SEAL |
CN2259339Y (en) * | 1995-06-20 | 1997-08-13 | 张洪杰 | Roller pin type central rocker arm bushing for vehicle |
JP3563354B2 (en) * | 2001-02-09 | 2004-09-08 | 株式会社椿本チエイン | Roller chains incorporating roller bearings |
DE102012200824B4 (en) * | 2012-01-20 | 2021-02-11 | Schaeffler Technologies AG & Co. KG | Radial needle roller bearing assembly |
CN202441731U (en) * | 2012-02-17 | 2012-09-19 | 三一重工股份有限公司 | Shaft and shaft sleeve floating fit structure and double-intermediate shaft transmission |
CN203158533U (en) * | 2013-03-15 | 2013-08-28 | 陕西汉德车桥有限公司 | Roller pin sleeve assembly |
CN203717640U (en) * | 2014-03-09 | 2014-07-16 | 启东锦桥轴承有限公司 | Low-noise needle bearing for automobile steering knuckle |
-
2016
- 2016-08-12 CN CN201610664010.4A patent/CN106050909B/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
CN106050909A (en) | 2016-10-26 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US7651275B2 (en) | Wheel bearing apparatus | |
CN205478936U (en) | Deep groove ball bearing with lubrication groove | |
JP2008100632A (en) | Bearing device for wheel | |
CN108916238B (en) | A kind of biserial compound machine bearing for washing machine | |
CN106050909B (en) | A kind of needle roller bushing and its auxiliary assembling structure | |
CN106246718A (en) | A kind of needle roller lining and auxiliary assembling structure thereof | |
CN102322499A (en) | The heavy duty step chains | |
CN209414395U (en) | Composite track roller | |
CN208764142U (en) | A kind of hub-bearing unit that lubricant effect is excellent | |
CN106246717A (en) | A kind of needle roller lining and auxiliary assembling structure thereof | |
CN206655919U (en) | A kind of spherical end surface cylindrical roller | |
CN106050908B (en) | A kind of needle roller bushing and its auxiliary assembling structure | |
CN105673702A (en) | Novel ball bearing with outer ring being V-shaped rolling track and inner ring being arc-shaped rolling track | |
CN212373484U (en) | Maintenance-free steering knuckle assembly | |
CN202165520U (en) | Heavy-load step chain | |
CN207510500U (en) | Knuckle, steeraxle and vehicle | |
CN107084192B (en) | Bidirectional propulsion rolling bearing | |
CN207261619U (en) | A kind of spring bearing and thrust bearing structure for main reducer of middle axle | |
CN106369057A (en) | Graphite shaft sleeve | |
CN202274001U (en) | Universal joint assembly with high sealing property | |
CN111469918A (en) | Non-maintaining knuckle assembly | |
CN205780285U (en) | A kind of automobile steering device biserial deep groove ball bearing | |
CN209146144U (en) | A kind of anti-friction bearing | |
CN106969029A (en) | Bidirectional propulsion rolling bearing | |
CN101443564A (en) | Bearing device for wheel |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
C06 | Publication | ||
PB01 | Publication | ||
C10 | Entry into substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
CB02 | Change of applicant information |
Address after: 230601 Anhui Province, Hefei City Industrial Park, the Peach Blossom Road No. 669 Applicant after: ANHUI JIANGHUAI AUTOMOBILE GROUP Corp.,Ltd. Address before: 230601 Anhui Province, Hefei City Industrial Park, the Peach Blossom Road No. 669 Applicant before: ANHUI JIANGHUAI AUTOMOBILE Co.,Ltd. |
|
COR | Change of bibliographic data | ||
GR01 | Patent grant | ||
GR01 | Patent grant | ||
CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180406 |
|
CF01 | Termination of patent right due to non-payment of annual fee |