CN202790347U - Hub reduction gear and vehicle - Google Patents
Hub reduction gear and vehicle Download PDFInfo
- Publication number
- CN202790347U CN202790347U CN 201220495221 CN201220495221U CN202790347U CN 202790347 U CN202790347 U CN 202790347U CN 201220495221 CN201220495221 CN 201220495221 CN 201220495221 U CN201220495221 U CN 201220495221U CN 202790347 U CN202790347 U CN 202790347U
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- Prior art keywords
- wheel
- wheel reductor
- framework
- planet
- reductor
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Abstract
The utility model discloses a hub reduction gear which comprises a frame of the hub reduction gear and a planetary reduction mechanism arranged in the frame of the hub reduction gear. The planetary reduction mechanism comprises a sun wheel and a planet wheel meshed with the sun wheel. The planet wheel is arranged on a planet carrier which comprises a planet wheel installation support and a connection pillar which extends outwards and vertically from the planet wheel installation support. Corresponding fastening holes are respectively machined in the connection pillar and the frame of the hub reduction gear so that the planet carrier is detachably arranged on the frame of the hub reduction gear through fastening pieces. The utility model further discloses a vehicle utilizing the hub reduction gear. As the planet carrier of the hub reduction gear can be detachably arranged on the frame of the hub reduction gear through the fastening holes and the fastening pieces, the two parts can be machined alone. The machining is convenient and simultaneously, cleaning the interior of the hub reduction gear is convenient.
Description
Technical field
The utility model relates to the wheel reductor field of vehicle, particularly, relates to the vehicle of a kind of wheel reductor and this wheel reductor of use.
Background technique
At present in the general arrangement of heavy truck, full-sized bus, engineering machinery vehicle, need to make the assemblies such as gearbox, transfer case, transmission shaft can not make the size of these parts and quality excessive because bearing large torque, and need to the large as far as possible ratio of velocity ratio distribute to ransaxle.But, general axle main speed reducer is difficult to reach above-mentioned requirements, therefore the ransaxle of many heavy-duty cars, full-sized bus, engineering machinery adopts the again layout of additional wheel side reducer of single-stage (or twin-stage) main reducing gear, to obtain large reduction speed ratio and compact structure.
As shown in Figure 1, wheel reductor generally includes wheel reductor framework 1 ' and is positioned at the planetary gear speed reducing mechanism 2 ' of this wheel reductor framework 1 ' inside, wherein, sun gear 21 ' is installed in and has obtained power on the semiaxis 3 ', and planet wheel 22 ' then needs to be installed on the planet carrier 4 '.Rotate to drive the gear ring 9 ' that is assembled together with wheel hub 8 ' by planet wheel 22 ', thus so that wheel hub 8 ' rotation.At present, wheel reductor is generally integral design, be wheel reductor framework 1 ' and planet carrier 4 ' integrally casting moulding, therefore can cause the inner inconvenience cleaning of wheel reductor, and importantly, because structure is comparatively complicated, when the integrally casting moulding, casting manufacturability is poor and processing difficulties also very easily causes casting defect, so that the difficult quality control of device is reduced on the wheel limit.
The model utility content
A purpose of the present utility model provides a kind of wheel reductor, and this wheel reductor is convenient to be made, and the inside of wheel reductor convenient for cleaning.
Another purpose of the present utility model provides a kind of vehicle, the wheel reductor that this vehicle uses the utility model to provide.
To achieve these goals, the utility model provides a kind of wheel reductor, comprise wheel reductor framework and the planetary gear speed reducing mechanism that is positioned at this wheel reductor framework, described planetary gear speed reducing mechanism comprises sun gear and the planet wheel that meshes with this sun gear, described planet wheel is installed on the planet carrier, described planet carrier comprises the planet wheel scaffold and is connected vertically outward extending connection column of this planet wheel scaffold, wherein, described connection column is formed with respectively corresponding fastener hole with described wheel reductor framework, by fastening piece described planet carrier is removably mounted on the described wheel reductor framework.
Preferably, described connection column is formed with respectively corresponding positioning hole with described wheel reductor framework, and by the locating piece location, described positioning hole and described fastener hole arrange with one heart.
Preferably, described locating piece is tubular structure, and be contained in the described positioning hole, so that described wheel reductor framework and described planet carrier are positioned, and described fastening piece can pass this tubular structure so that described wheel reductor framework and described planet carrier are fixed together.
Preferably, be provided with the seam that form fit ground holds described connection post end on the described wheel reductor framework.
Preferably, the end of described connection column is provided with flange, and described fastener hole is formed on this flange.
Preferably, the installation shaft of described planet wheel is multidiameter shaft, the diameter of the middle body of this multidiameter shaft is greater than the diameter of two end portions, to form end difference, be formed with respectively the mounting hole that described installation shaft is installed on described wheel reductor framework and the described planet wheel scaffold, the described two end portions of described multidiameter shaft wears respectively in the mounting hole of described wheel reductor framework and described planet wheel scaffold, so that described end difference can be against the exterior edge face of described mounting hole.
Preferably, be provided with seal ring between described connection column and the described wheel reductor framework, described fastening piece passes the sealing circle.
Preferably, described fastening piece is threaded piece, and the fastener hole that is formed on the described connection column is tapped through hole, is coated with the thread seal glue-line on the screw thread of described threaded piece.
Preferably, be provided with tank filler sleeve and drain oil on the described wheel reductor framework, this tank filler sleeve and drain oil and described wheel reductor internal communication, and by the plug screw shutoff.
According on the other hand of the present utility model, a kind of vehicle is provided, this vehicle comprises wheel hub and passes rotationally the semiaxis of this wheel hub, wherein, described vehicle comprise also that the utility model provides wheel reductor, described wheel reductor framework is removably mounted on the described wheel hub, and described sun gear is installed on the described semiaxis.
Pass through technique scheme, because the planet carrier of the wheel reductor that the utility model provides can be removably mounted on the framework of wheel reductor by fastener hole and fastening piece, therefore these two parts can be processed separately, in easily manufactured, cleaning inside that can also the convenient wheel side reducer is so that the wheel reductor that provides and vehicle are practical.
Other feature and advantage of the present utility model will partly be described in detail in embodiment subsequently.
Description of drawings
Accompanying drawing is to be used to provide further understanding of the present utility model, and consists of the part of specification, is used from explanation the utility model with following embodiment one, but does not consist of restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the sectional structure schematic representation of wheel reductor in the prior art;
Fig. 2 is the sectional structure schematic representation of the wheel reductor that provides of the utility model the first preferred implementation;
Fig. 3 is the structure enlarged diagram of A section among Fig. 2;
Fig. 4 is the structure enlarged diagram of B section among Fig. 2;
Fig. 5 is the sectional structure schematic representation after the wheel reductor framework that provides of the utility model the second preferred implementation and the planet carrier assembling.
Fig. 6 is the relevant hole position layout plan of wheel reductor framework in the utility model preferred implementation.
Description of reference numerals
1,1 ' wheel reductor framework, 2,2 ' planetary gear speed reducing mechanism
3,3 ' semiaxis, 44 ' planet carrier
7,7 ' gear ring, 8,8 ' wheel hub
11 oil inlet holes, 12 drain oils
2122 ' sun gear, 22 ' 22 planet wheels
41 planet wheel scaffolds 42 connect column
43 flanges, 51 fastener holes
52 fastening pieces, 53 positioning holes
54 locating pieces, 55 seams
61 installation shaft, 62 mounting holes
71 seal rings, 13 plug screws
The a end difference
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is elaborated.Should be understood that embodiment described herein only is used for description and interpretation the utility model, is not limited to the utility model.
In the utility model, do not doing in the situation of opposite explanation, the noun of locality that uses as " inside and outside " usually with a certain parts as benchmark, the inside of these parts is " interior ", be " outward " away from this parts outside, these nouns of locality only are used for explanation the utility model, are not limited to the utility model.
Extremely shown in Figure 6 such as Fig. 2, a kind of wheel reductor that the utility model provides, this wheel reductor is used at vehicle, passes to wheel hub 8 with the moment of torsion with main reducing gear output by semiaxis 3.
Wherein in order to realize the control of velocity ratio, this wheel reductor comprises wheel reductor framework 1 and is positioned at the planetary gear speed reducing mechanism 2 of this wheel reductor framework 1, wherein, wheel reductor framework 1 is removably mounted on the wheel hub 8 by the fastening pieces such as bolt (not sign), and planetary gear speed reducing mechanism comprises sun gear 21 and the planet wheel 22 that meshes with this sun gear 21, wherein, sun gear 21 is installed on the semiaxis 3 to be driven by semiaxis 3, and planet wheel 22 is installed on the planet carrier 4, to be driven by sun gear 21.In addition, also be provided with the gear ring 7 that is installed on the wheel hub 8 in planet wheel 22 outsides, thereby this gear ring 7 can be driven with planet wheel 2 engagements, then drives wheel hub 8 and rotate.
Particularly, the planet carrier 4 that the utility model provides comprises planet wheel scaffold 41 and is connected vertically outward extending connection column 42 of this planet wheel scaffold 41, this connects column 42 can be for a plurality of, those skilled in the art can determine its number according to actual requirement, to satisfy the installation strength of planet carrier 4.This connection column 42 can be separated planet wheel scaffold 41 and wheel reductor framework 1, thereby planet wheel 21 can be installed between planet wheel scaffold 41 and the wheel reductor framework 1.
In order to realize the purpose of this utility model, in the wheel reductor that the utility model provides, the connection column 42 of planet carrier 4 is formed with respectively corresponding fastener hole 51 with wheel reductor framework 1, to be preferably screw by fastening piece 52() planet carrier 4 is removably mounted on the wheel reductor framework 1.That is, in the utility model, planet carrier 4 and wheel reductor framework 1 are unitary part, and the two can make separately processing, and can when cleaning operation the two be dismantled.Therefore, planet carrier 4 and wheel reductor framework 1 are conveniently processed, and for example conveniently cast processing, especially can conveniently process the mating face of planet wheel scaffold 41 and planet wheel 22, so that the installation of planet wheel 22 is more accurate.In addition, when needs clean wheel reductor inside, only need the two dismounting is got final product, so that the turbidity test of the wheel reductor that the utility model provides are high.
Need to prove, the mode of execution that can finish technique scheme has multiple, for example connect in the mounting type of column 42 and wheel reductor framework 1, fastener hole 51 can also can be blind hole etc. for through hole, the utility model for convenience of description, in this introduction preferred implementation wherein, this preferred implementation only is used for explanation the utility model.In addition, the structure of wheel reductor for convenience of description in Fig. 1 and Fig. 2, for example in Fig. 2, the cutting line of shown cross-sectional schematic can be straight line, also can be broken line.The position relationship that is each parts shown in Fig. 2 can also be other forms, and the various arrangements that those skilled in the art can expect all should drop in the protection domain of the present utility model.
As shown in Figures 2 and 3, in the first preferred implementation of the present utility model, for the convenient fastening piece 51 that uses is fixed on planet carrier 4 on the wheel reductor framework 1, connect column 42 and be formed with respectively corresponding positioning hole 53 with wheel reductor framework 1, and by locating piece 54 location, wherein preferably, positioning hole 52 and fastener hole 51 arrange with one heart.Can reduce the processing quantity in the hole on wheel reductor framework 1, positioning hole 53 can utilize the fastener hole 51 of having processed to process, wherein ream operation can be carried out in the end of fastener hole 51, so that the aperture of positioning hole 53 is greater than the aperture of fastener hole 51, thereby can be used for holding the locating pieces 54 such as locating stud.Wherein, in preferred implementation of the present utility model, locating piece 54 is the locating stud of tubular structure, and can be contained in the positioning hole 53, so that wheel reductor framework 1 and planet carrier 4 are positioned, and fastening piece 52 can pass this tubular structure so that wheel reductor framework 1 and planet carrier 4 are fixed together.
In real work, can at first locating piece 54 be embedded in the positioning hole 53, so that wheel reductor framework 1 be connected column 42 and can before installing, position, then the fastening pieces such as screw 52 are being inserted in fastener hole and the locating piece 54, thereby realizing that easily will connect column 42 removably is fixed on the wheel reductor framework 1.Wherein be a plurality of owing to connect column 42, only need will be wherein in two fastener holes 51 processing positioning hole 53 can realize planet carrier 4 is positioned on the wheel reductor framework 1, thereby played the advantage of simplification manufacturing procedure.
In addition, in preferred implementation of the present utility model, as shown in Figure 3, preferably, be provided with form fit ground on the wheel reductor framework 1 and hold the seam 55 that connects column 42 ends.Namely when being installed in planet carrier 4 on the wheel reductor framework 1, can be contained in this seam 55 connecting column, thereby further facilitated the location of planet carrier 4 and wheel reductor framework 1, owing to can play positioning action, this moment only a positioning hole that matches 53 need be set and locating stud 54 can be realized planet carrier 4 is positioned on the wheel reductor framework 1.In addition, the coupling stiffness that this seam 55 can also increase planet carrier 4 and wheel reductor framework 1 is set, and can bears the inertial force that planetary gears produces because of dynamic balancing in movement process.So that the wheel reductor practicability that the utility model provides is higher.
In the utility model, size and the requirement of strength with wheel reductor inside depended in mounting point in the middle of connection column 42 and the wheel reductor framework 1, therefore, in the first mode of execution and the second mode of execution as shown in Figure 5 as shown in Figure 2, different is to connect column 42 to install with wheel reductor framework 1 in a different manner, wherein.In Fig. 2, fastener hole 51 can be formed directly on the end face that connects column 42.But in some cases, if because structure is limit, the face area that connects column 42 is less, the quantity of the fastener hole 51 that can arrange and the requirement that can not satisfy 4 transmitting torques of planet carrier, can adopt the second mode of execution as shown in Figure 5 this moment, that is, the end that connects column 42 is provided with flange 43, fastener hole 51 is formed on this flange 43, thereby increases the zone that fastener hole 51 can be set.So that the transmitting torque ability of planet carrier 4 promotes greatly.Although this moment, planet carrier 4 increased to some extent because these flange 43 thickness are set, but can pass through to reduce the weight that connects column 42 by optimizing connection column 42, and the control overall weight does not increase.
In addition, in order to guarantee the normal operation of planetary gear speed reducing mechanism 2, at the inner gear wet goods lubricant oil of filling of wheel reductor, this moment as shown in Figure 3 usually, can be provided with seal ring 71 between connection column 42 and wheel reductor framework 1, fastening piece 52 then passes sealing circle 71.To prevent in lubricant oil leakage of oil by the fastener hole 51 on the wheel reductor framework 1.In addition, when the fastener hole 51 on being arranged on connection column 42 is through hole, then can further increase lubricant oil from the possibility of fastener hole 51 leakage of oils, because fastening piece 51 is generally threaded piece, such as screw or bolt etc. is formed on the fastener hole that connects on the column 42 and then is tapped through hole, therefore in this case, can before threaded piece is fastening, apply nut seal glue at its screw thread, namely after installation, be coated with the thread seal glue-line on the screw thread of this threaded piece.The fastener hole 52 that passes through that can mode gear wet goods lubricant oil leaks outside.
In addition, for planet wheel 22 is installed, planet wheel 22 all has installation shaft 61, and be formed with respectively the mounting hole 62 that this installation shaft 61 is installed on wheel reductor framework 1 and the planet wheel scaffold 41, in the prior art, as shown in Figure 1, installation shaft 61 is positioned in the mounting hole 62 by the locating pieces such as straight pin (not sign) usually, need this moment to process the positioning hole that holds the locating pieces such as straight pin at mounting hole 62 and installation shaft 62 separately, because installation shaft 61 and mounting hole 62 adopt interference fit usually, then be difficult to so that difficulty to it, is assembled in the positioning hole center on two parts.In order to address this problem, in the wheel reductor that the utility model provides, such as Fig. 2 and shown in Figure 5, preferably, the installation shaft 61 of planet wheel 22 is multidiameter shaft, and the diameter of the middle body of this multidiameter shaft is greater than the diameter of two end portions, to form end difference a, the two end portions that wherein diameter of multidiameter shaft is less can wear respectively in the mounting hole 62 of wheel reductor framework 1 and planet wheel scaffold 41, so that the end difference a of installation shaft 61 can be against the exterior edge face of mounting hole 62.Particularly, as shown in the figure, this installation shaft 61 can be divided into three sections, and wherein the diameter in stage casing is greater than the diameter of both sides section, thereby form end difference a in the both sides in stage casing, with by these two end difference a respectively against the exterior edge face of the mounting hole 62 of planet wheel scaffold 41 and hub reduction machine frame 1.Therefore, can simply installation shaft 61 be positioned in the mounting hole 62 in this way, so that the wheel reductor that the utility model provides is easy to assembly.
In addition, for the convenient interpolation and the discharging that are lubricated oil to wheel reductor inside, preferably, as shown in Figure 6, be provided with tank filler sleeve 11 and drain oil 12 on the wheel reductor framework 1, this tank filler sleeve 11 and drain oil 12 and wheel reductor internal communication, and by plug screw 13 shutoff.More specifically, tank filler sleeve 11 is arranged on the medium position of wheel reductor framework 1, and drain oil 12 then is arranged on the outward edge position of wheel reductor framework 1, therefore when drain oil 12 rotate in place in the tank filler sleeve below, then can be lubricated the discharging of oil.Wherein plug screw 13 is parts common in related domain, and those skilled in the art can also select other closeouts that can think to come two oilholes of shutoff.Wherein, since tank filler sleeve 11 and fuel outlet 12 and corresponding plug screw all can between be arranged on the upper of wheel reductor framework 1, do not need in the outside of wheel reductor framework 1 to arrange separately again the parts that are similar to end cap, thereby so that the structure of the wheel reductor that the utility model provides more optimize.
To sum up, each parts manufacturing of the wheel reductor that the utility model provides is simple, easy to assembly, and good airproof performance.Therefore, the utility model wheel reductor that provides and vehicle that uses this wheel reductor has higher practicability and promotional value.
Below describe by reference to the accompanying drawings preferred implementation of the present utility model in detail; but; the utility model is not limited to the detail in the above-mentioned mode of execution; in technical conceive scope of the present utility model; can carry out multiple simple variant to the technical solution of the utility model, these simple variant all belong to protection domain of the present utility model.
Need to prove in addition, each concrete technical characteristics described in above-mentioned embodiment in reconcilable situation, can make up by any suitable mode, for fear of unnecessary repetition, the utility model is to the no longer separately explanation of various possible compound modes.
In addition, also can carry out combination in any between the various mode of execution of the present utility model, as long as it is without prejudice to thought of the present utility model, it should be considered as content disclosed in the utility model equally.
Claims (10)
1. wheel reductor, comprise wheel reductor framework (1) and be positioned at the planetary gear speed reducing mechanism (2) of this wheel reductor framework (1), described planetary gear speed reducing mechanism comprises sun gear (21) and the planet wheel (22) that meshes with this sun gear (21), described planet wheel (22) is installed on the planet carrier (4), described planet carrier (4) comprises planet wheel scaffold (41) and is connected vertically outward extending connection column (42) of this planet wheel scaffold (41), it is characterized in that, described connection column (42) is formed with respectively corresponding fastener hole (51) with described wheel reductor framework (1), by fastening piece (52) described planet carrier (4) is removably mounted on the described wheel reductor framework (1).
2. wheel reductor according to claim 1, it is characterized in that, described connection column (42) is formed with respectively corresponding positioning hole (53) with described wheel reductor framework (1), and by locating piece (54) location, described positioning hole (52) and described fastener hole (51) arrange with one heart.
3. wheel reductor according to claim 2, it is characterized in that, described locating piece (54) is tubular structure, and be contained in the described positioning hole (53), so that described wheel reductor framework (1) and described planet carrier (4) are positioned, and described fastening piece (52) can pass this tubular structure so that described wheel reductor framework (1) and described planet carrier (4) are fixed together.
4. the described wheel reductor of any one is characterized in that according to claim 1-3, is provided with form fit ground on the described wheel reductor framework (1) and holds the seam (55) of described connection column (42) end.
5. the described wheel reductor of any one is characterized in that according to claim 1-3, and the end of described connection column (42) is provided with flange (43), and described fastener hole (51) is formed on this flange (43).
6. wheel reductor according to claim 1, it is characterized in that, the installation shaft (61) of described planet wheel (22) is multidiameter shaft, the diameter of the middle body of this multidiameter shaft is greater than the diameter of two end portions, to form end difference (a), be formed with respectively the mounting hole (62) that described installation shaft (61) is installed on described wheel reductor framework (1) and the described planet wheel scaffold (41), the described two end portions of described multidiameter shaft wears respectively in the mounting hole (62) of described wheel reductor framework (1) and described planet wheel scaffold (41), so that described end difference (a) can be against the exterior edge face of described mounting hole (62).
7. the described wheel reductor of any one is characterized in that according to claim 1-3, is provided with seal ring (71) between described connection column (42) and the described wheel reductor framework (1), and described fastening piece (52) passes sealing circle (71).
8. the described wheel reductor of any one according to claim 1-3, it is characterized in that, described fastening piece (51) is threaded piece, and the fastener hole that is formed on the described connection column (42) is tapped through hole, is coated with the thread seal glue-line on the screw thread of described threaded piece.
9. wheel reductor according to claim 1, it is characterized in that, be provided with tank filler sleeve (11) and drain oil (12) on the described wheel reductor framework (1), this tank filler sleeve (11) and drain oil (12) and described wheel reductor internal communication, and by plug screw (13) shutoff.
10. vehicle, this vehicle comprises wheel hub (8) and passes rotationally the semiaxis (3) of this wheel hub (8), it is characterized in that, described vehicle also comprises according to claim 1 the described wheel reductor of any one in-9, described wheel reductor framework (1) is removably mounted on the described wheel hub (8), and described sun gear (21) is installed on the described semiaxis (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220495221 CN202790347U (en) | 2012-09-26 | 2012-09-26 | Hub reduction gear and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220495221 CN202790347U (en) | 2012-09-26 | 2012-09-26 | Hub reduction gear and vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202790347U true CN202790347U (en) | 2013-03-13 |
Family
ID=47817613
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220495221 Expired - Lifetime CN202790347U (en) | 2012-09-26 | 2012-09-26 | Hub reduction gear and vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202790347U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103574000A (en) * | 2013-11-08 | 2014-02-12 | 无锡威孚精密机械制造有限责任公司 | Shell structure of hub reduction gear |
| CN106090138A (en) * | 2016-08-18 | 2016-11-09 | 广东富华重工制造有限公司 | A kind of hub reduction gear |
| CN110529583A (en) * | 2019-08-13 | 2019-12-03 | 一汽解放汽车有限公司 | A kind of hub reduction gear end face seal structure |
| CN110561976A (en) * | 2019-08-21 | 2019-12-13 | 华中科技大学 | novel waterproof high-strength hub structure |
-
2012
- 2012-09-26 CN CN 201220495221 patent/CN202790347U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103574000A (en) * | 2013-11-08 | 2014-02-12 | 无锡威孚精密机械制造有限责任公司 | Shell structure of hub reduction gear |
| CN103574000B (en) * | 2013-11-08 | 2016-05-04 | 无锡威孚精密机械制造有限责任公司 | The shell structure of hub reduction gear |
| CN106090138A (en) * | 2016-08-18 | 2016-11-09 | 广东富华重工制造有限公司 | A kind of hub reduction gear |
| CN110529583A (en) * | 2019-08-13 | 2019-12-03 | 一汽解放汽车有限公司 | A kind of hub reduction gear end face seal structure |
| CN110561976A (en) * | 2019-08-21 | 2019-12-13 | 华中科技大学 | novel waterproof high-strength hub structure |
| CN110561976B (en) * | 2019-08-21 | 2020-12-08 | 华中科技大学 | Novel waterproof high-strength hub structure |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130313 |
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| CX01 | Expiry of patent term |