CN114801844A - Guide post and battery pack guiding system with same - Google Patents
Guide post and battery pack guiding system with same Download PDFInfo
- Publication number
- CN114801844A CN114801844A CN202210364012.7A CN202210364012A CN114801844A CN 114801844 A CN114801844 A CN 114801844A CN 202210364012 A CN202210364012 A CN 202210364012A CN 114801844 A CN114801844 A CN 114801844A
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- frame
- panel
- battery pack
- bearing
- guide post
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/80—Exchanging energy storage elements, e.g. removable batteries
Abstract
The invention discloses a guide post and a battery pack guiding system with the same, wherein the guide post comprises: a guide surface with a hollow part is arranged below the first frame, the guide surface is an inclined surface, and the edges of the periphery of the guide surface are fixedly provided with the first frame; the bearing assembly is arranged at a hollow part below the guide surface and comprises a second frame and a plurality of rolling bearings; the first panel is arranged above the guide surface, the first panel is provided with a fourth through hole for the rolling bearing to pass through, an outer bearing of the rolling bearing is exposed out of the first panel, and the first frame, the second frame and the first panel are fixedly connected. When the first panel is contacted with the second panel, the rolling bearings are all retracted into the third frame, so that the normal operation of the battery replacement process is ensured, and the impact force between the battery pack and the guide post is reduced.
Description
Technical Field
The invention relates to the technical field of new energy automobiles, in particular to a guide post and a battery pack guiding system with the same.
Background
Energy supplement of the new energy electric automobile is divided into two modes of plug-in charging and battery replacement. The plug-in charging mode has the problems of high initial cost for purchasing the battery, long charging time and low charging safety. The battery replacement mode is matched with large-scale centralized charging to form a competitive technical mode. The replaceable battery pack is generally mounted at a position below the chassis, at a side of the frame, at a rear of the frame, and above the frame, depending on the type of vehicle. The battery pack arranged above the frame is generally replaced by a hoisting type battery replacement method.
When the hoisting type battery replacing mechanism replaces the battery, the battery replacing mechanism flexibly replaces the battery, a certain shaking degree can be generated when the battery pack falls, and the battery pack is guided by the first-stage guide post, the second-stage guide post and the third-stage guide post in the process of falling onto the battery pack bracket, so that the battery pack accurately falls onto the battery pack bracket to complete the whole battery replacing. When the battery pack is replaced, the battery pack firstly passes through the primary guide post before being placed in place, and the battery pack shaking amount with larger shaking degree is limited within a smaller shaking degree range through the primary guide post, so that the shaking degree value meets the requirement of the guiding capacity of the secondary guide post.
The existing first-stage guide post is an integrated structure with an upper guide surface and a lower guide post, is made of high-strength steel, is generally directly welded on the battery pack bracket, and forms an integrated structure with the battery pack bracket, as shown in fig. 9. The battery package falls the in-process and produces certain degree of shaking, and when the battery package contacted one-level guide post, through one-level guide post direction with battery package degree of shaking control in certain extent, the battery package can produce the impact force to one-level guide post spigot surface with one-level guide post contact in-process, the contact back direction in-process battery package can produce great frictional force with one-level guide post. The impact force and the friction force can cause deformation and friction damage to the primary guide post in the battery replacement process, and the battery replacement can be directly influenced in severe cases; while causing the same damage to the battery pack frame. In addition, when the mining area mine card and the long-distance heavy card are subjected to battery replacement, the mining area mine card and the long-distance heavy card have the characteristics of continuous working time, poor working road condition and high working strength, and the damaged part of the first-level guide column is likely to be torn and damaged due to vibration, so that the battery replacement failure and the potential safety hazard of a battery pack are increased. Because the fixed welding of one-level guide post is on the battery package bracket, need pull down the battery package bracket when changing the one-level guide post of damage and cut the change, maintenance duration is long, and maintenance process is complicated, and cost of maintenance is high, seriously influences vehicle operation efficiency.
Disclosure of Invention
Aiming at the technical problems that the existing primary guide post is easy to damage and not easy to replace when the battery is replaced in the prior art, the invention provides a guide post and a battery pack guide system with the same.
In one aspect, the present invention provides a guide post, including:
a guide surface with a hollow part is arranged below the frame, the guide surface is an inclined surface, and a first frame is fixedly arranged on the peripheral edge of the guide surface;
the bearing assembly is arranged in a hollow part below the guide surface and comprises a second frame and a plurality of rolling bearings;
the first panel is arranged above the guide surface, a fourth through hole is formed in the first panel, the rolling bearing passes through the fourth through hole, an outer bearing of the rolling bearing is exposed out of the first panel, and the first frame and the second frame are fixedly connected with the first panel.
In some embodiments, the first frame is provided with a plurality of first through holes, the second frame is provided with a plurality of second through holes, the first panel is provided with a plurality of third through holes with large outside and small inside, and the first through holes, the second through holes and the third through holes are matched with each other.
In some embodiments, the bearing assembly further comprises:
the size of an inner area defined by the third frame and the first frame is consistent, and the second frame is fixedly arranged on the outer ring of the third frame;
the bearing rod is fixedly connected with an inner bearing of the rolling bearing;
positioning grooves symmetrically and fixedly arranged on the inner wall of the third frame, wherein the positioning grooves are used for limiting the bearing rod;
the elastic element is arranged in the positioning groove and is selected according to the bearing capacity of the rolling bearing.
In some embodiments, the two ends of the bearing rod are provided with concentric large-end cylindrical structures or coaxial small bearing structures.
In some embodiments, the resilient element is a spring and the rolling bearing is a deep groove ball bearing.
In some embodiments, the first frame, the second frame, and the third frame are all steel plate frames.
On the other hand, the invention provides a battery pack guiding system, which comprises a guide post and further comprises:
the guide column bodies are fixedly arranged on the battery pack bracket in pairs, and the battery pack bracket is provided with a buffer rubber pad;
the battery pack frame is provided with a second panel at the contact part of the battery pack frame and the first panel.
In some embodiments, one end of the second panel has a bevel.
In some embodiments, a plurality of fifth through holes with a large outer part and a small inner part are arranged on the second panel, and the second panel is fixed on the battery pack frame through the fifth through holes.
In some embodiments, the first panel and the second panel are both composite wear resistant materials.
Compared with the prior art, the invention has the beneficial effects that:
the first panel and the bearing assembly of the guide column are detachably connected with the frame of the guide surface, and the maintenance can be completed by quickly replacing parts, so that the maintenance difficulty is reduced, the maintenance time is greatly shortened, and the working efficiency is ensured.
The invention reduces the friction force between the first panel and the second panel through the elasticity of the elastic element and the rotation of the rolling bearing, in addition, the friction force between the first panel and the second panel is smaller than the friction force of rigid contact, the guide surface of the guide post is also protected while the frame of the battery pack is protected, and the risk of structural damage in the subsequent operation process of the battery pack is eliminated.
When the first panel is in contact with the second panel, the rolling bearings are all retracted into the third frame, so that the normal operation of the battery replacement process is ensured, and the impact force between the battery pack and the guide post is reduced.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a cross-sectional view of a guide post according to the present invention;
FIG. 2 is a front view of a guide post according to the present invention;
FIG. 3 is a schematic structural view of a bearing assembly according to the present invention;
FIG. 4 is a schematic view of a connection structure of a rolling bearing and a bearing rod according to the present invention;
FIG. 5 is a schematic structural view of a guide surface of a guide post according to the present invention;
FIG. 6 is a schematic structural diagram of a first panel according to the present invention;
FIG. 7 is a side view of a second panel in accordance with the present invention;
FIG. 8 is a front view of a second panel in accordance with the present invention;
fig. 9 is a cross-sectional view of a prior art guide post.
Description of reference numerals:
the guide device comprises a guide surface 1, a first frame 2, a second frame 3, a third frame 4, a first panel 5, a second panel 6, a first through hole 7, a second through hole 8, a third through hole 9, a fourth through hole 10, a fifth through hole 11, a rolling bearing 12, a bearing rod 13, a positioning groove 14, an elastic element 15, a bolt 16 and a bearing assembly 17.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The following describes a guide post and a battery pack guide system having the same according to embodiments of the present invention with reference to the accompanying drawings.
As shown in fig. 1 to 8, the guide post of the present invention mainly comprises: guide surface 1, bearing assembly 17 and first panel 5.
In some embodiments, the guiding surface 1 is a slope, and the lower part of the guiding surface 1 is a hollow structure.
In some embodiments, the guide surface 1 is fixedly provided with a first frame 2 around its peripheral edge. Specifically, the first frame 2 is welded and fixed around the guide surface 1 to form a frame of the guide surface 1. Preferably, the first frame 2 is a steel plate frame. It will be appreciated that the first frame 2 may also be of other suitable materials.
In some embodiments, a plurality of first through holes 7 are provided on the first frame 2. That is, a plurality of first through holes 7 are distributed on the first frame 2, and the first panel 5 and the bearing assembly 17 are fixedly coupled through the through holes.
In some embodiments, the first panel 5 is fixedly disposed above the guide surface 1, and the fourth through hole 10 is disposed on the first panel 5. It will be appreciated that the first panel 5 is of a size corresponding to the size of the guide surface 1. The fourth through hole 10 is used for passing a rolling bearing 12 of a bearing assembly 17. Specifically, the outer bearing of the rolling bearing 12 passes through the fourth through hole 10 and is exposed out of the first panel 5. It is understood that the fourth through holes 10 correspond one-to-one to the rolling bearings 12.
In some embodiments, a plurality of third through holes 9 are provided on the first panel 5. The third through hole 9 in the first panel 5 cooperates with the first through hole 7 in the first frame 2. That is, the third through holes 9 on the first panel 5 have the same hole positions and the same number of holes as the first through holes 7 on the first frame 2.
In some embodiments, the third through hole 9 on the first panel 5 is a through hole with a large outer part and a small inner part, so that when the bolt 15 is used to fixedly connect the first panel 5 with the first frame 2, the bolt cap is not higher than the surface of the first panel 5 after the bolt 15 is tightened, and the bolt 15 is prevented from being damaged in the working process. It will be appreciated that the face of the first panel 5 facing the guide surface is an inner face and the face of the first panel 5 facing away from the guide surface is an outer face.
In some embodiments, the first panel 5 is a composite wear resistant material thereon.
In some embodiments, a bearing assembly 17 is provided in the hollow portion below the guide surface 1, the bearing assembly 17 including the second frame 3, the third frame 4, the bearing rod 13, the positioning groove 14, the elastic member 15, and the plurality of rolling bearings 12.
The third frame 4 is an assembly frame of a bearing assembly 17, the bearing rod 13, the positioning groove 14, the elastic element 15 and the plurality of rolling bearings 12 are accommodated in the third frame 4, and the second frame 3 is fixedly arranged on an outer ring of the third frame 4. It can be understood that the third frame 4 and the first frame 2 enclose an inner area, specifically, the first frame 2 encloses an inner area, and the outer dimension of the third frame 4 is the same as the dimension of the inner area enclosed by the first frame 2, so that the third frame 4 can be disposed under the first frame 2. Preferably, the third frame 4 is a steel plate frame. It will be appreciated that the third frame 4 may also be of other suitable materials.
The second frame 3 is welded on the outer ring of the third frame 4, and the size of the second frame 3 is consistent with that of the first frame 2. The second frame 3 is provided with a plurality of second through holes 8. The opening position and the opening number of the second through holes 8 on the second frame 3 are consistent with those of the first through holes 7 on the first frame 2. That is, the first through hole 7 of the first frame 2, the second through hole 8 of the second frame 3, and the third through hole 9 of the first panel 5 are engaged with each other, thereby connecting the bearing assembly 17, the first panel 5, and the first frame 2. Preferably, the second frame 3 is a steel plate frame. It will be appreciated that the second frame 3 may also be of other suitable materials. It can be understood that the bearing assembly 17 and the first panel 5 are detachably fixed on the first frame 2, so that when the bearing assembly 17 or the first panel 5 needs to be replaced, only the damaged corresponding assembly needs to be detached, thereby shortening the maintenance time and improving the working efficiency.
In some embodiments, the rolling bearing 12 is arranged within the third frame 4 by means of a bearing rod 13. Specifically, the inner bearing of the rolling bearing 12 is fixedly connected to the bearing rod 13, so that the rolling bearing 12 is fixed to the bearing rod 13. As can be seen, the rolling bearing 12 is fixed to the bearing rod 13 by an inner bearing, and an outer bearing of the rolling bearing 12 is exposed to the first panel 5. It will be appreciated that the rolling bearing 12 may be a deep groove ball bearing or other suitable bearing. In addition, the number of rolling bearings 12 is set according to actual requirements.
In some embodiments, the two ends of the bearing rod 13 are provided with concentric large-head cylindrical structures or coaxial small bearing structures. It will be appreciated that in use the ends of the bearing rod 13 are placed in the locating slots 14, the design of the locating slots 14 preventing unhooking of the bearing during operation.
In some embodiments, the positioning groove 14 is symmetrically and fixedly disposed on the inner wall of the third frame 4, and the positioning groove 14 is used for limiting the bearing rod 13. Specifically, the positioning grooves 14 are welded on the inner wall of the third frame 4, and the number of the positioning grooves 14 is arranged according to actual needs.
In some embodiments, an elastic element 15 is provided inside the positioning slot 14, the elastic element 15 being selected according to the bearing capacity of the rolling bearing 12. When mounting, the elastic element 15 is first placed in the positioning groove 14, and then the two ends of the bearing rod 13 are placed in the positioning groove 14.
In some embodiments, the resilient element 15 is a spring.
The battery pack guiding system comprises a guide post, a battery pack bracket and a battery pack frame. Wherein the guide post is the guide post described above; the battery pack bracket is a support structure for the battery pack to be dropped on the vehicle, and is a support mechanism for fixing the battery pack.
In some embodiments, a cushion rubber pad is arranged on the battery pack bracket. The buffering cushion is used for buffering the battery package at the battery package whereabouts, prevents that battery package and battery package bracket from producing violent collision.
The guide posts are fixedly arranged on the battery pack bracket in pairs, and when the battery pack falls onto the vehicle battery pack bracket, the guide posts arranged in pairs guide the battery pack, so that the battery pack accurately falls onto the battery pack bracket according to the designed position.
In some embodiments, the second panel 6 is disposed at the contact portion of the battery pack frame and the first panel 5. Set up a plurality of big-end-up inside fifth through-holes 11 on the second panel 6, fix second panel 6 on the battery package frame through fifth through-hole 11. It is understood that the side of the second panel 6 facing the battery pack frame is the inner side, and the side of the second panel 6 facing away from the battery pack frame is the outer side. Specifically, set up on the battery package frame with fifth through-hole 11 complex hole, fix second panel 6 on the battery package frame through the bolt, the nut is not higher than the surface of second panel 6 after the bolt is screwed up. In addition, the thickness of the second panel 6 is smaller than that of the buffer rubber mat, so that the buffer rubber mat is prevented from being invalid.
In some embodiments, the second panel 6 has a bevel at one end. That is, one end of the second panel 6 is designed to be inclined to better fit the guide surface when the battery pack falls down.
In some embodiments, the second panel 6 is a composite wear resistant material.
The battery pack guiding system is applied to a hoisting type battery replacing vehicle. The hoisting type battery replacement vehicle is driven by pure electric power, the battery pack is in a back type, the battery replacement vehicle drives into the battery replacement station, the battery replacement station control system sends a battery replacement system command, and the battery replacement robot acts to replace the battery pack in a hoisting mode, so that the vehicle with continuous endurance is completed.
When the battery pack is replaced, the battery pack is contacted with the guide post, the impact force in the falling process of the battery pack is reduced through the rotation of the rolling bearing 12 and the elastic element 15 below the bearing in the guiding process, and the guiding speed is increased. Along with the continuous progress of trading the electricity, the battery package continues to fall, and second panel 6 on the battery package frame pushes down antifriction bearing 12, and elastic element 15 contracts until second panel 6 and first panel 5 laminating. When the first panel 5 contacts with the second panel 6, the rolling bearings 12 are all retracted into the third frame 4, so that the normal operation of the battery replacement process is ensured, and the impact force of the battery pack and the guide post is reduced.
In the battery replacement process, the elastic force of the elastic element 15 and the rotation of the rolling bearing 12 reduce the friction force between the first panel 5 and the second panel 6, and in addition, the friction force between the first panel 5 and the second panel 6 is smaller than the friction force of rigid contact, so that the guide surface of the guide column is protected while the frame of the battery pack is protected, and the risk of structural damage in the subsequent operation process of the battery pack is eliminated. Through the design of the first panel 5 and the second panel 6, the structural damage caused by rigid contact of the battery pack and the guide posts is reduced, so that the structural safety of the battery pack frame and the guide posts is ensured. If the first panel 5, the second panel 6 or the bearing assembly 17 is damaged in the long-term operation process, the maintenance can be completed by quickly replacing parts, the maintenance difficulty is reduced, the maintenance time is greatly shortened, the operation efficiency of the vehicle is ensured, and meanwhile, certain spare parts can be prepared due to the high standardization degree and the low price of the invention.
In the description of the specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms may be directed to different embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A steering column, comprising:
a guide surface with a hollow part is arranged below the frame, the guide surface is an inclined surface, and a first frame is fixedly arranged on the peripheral edge of the guide surface;
the bearing assembly is arranged in a hollow part below the guide surface and comprises a second frame and a plurality of rolling bearings;
the first panel is arranged above the guide surface, a fourth through hole is formed in the first panel, the rolling bearing passes through the fourth through hole, an outer bearing of the rolling bearing is exposed out of the first panel, the first frame, the second frame and the first panel are fixedly connected, the first frame is provided with a plurality of first through holes, the second frame is provided with a plurality of second through holes, the first panel is provided with a plurality of third through holes which are large in outside and small in inside, and the first through holes, the second through holes and the third through holes are matched with each other.
2. The guide post of claim 1, wherein the bearing assembly further comprises:
the size of an inner area enclosed by the third frame and the first frame is consistent, and the second frame is fixedly arranged on the outer ring of the third frame;
the bearing rod is fixedly connected with an inner bearing of the rolling bearing;
positioning grooves symmetrically and fixedly arranged on the inner wall of the third frame, wherein the positioning grooves are used for limiting the bearing rod;
the elastic element is arranged in the positioning groove and is selected according to the bearing capacity of the rolling bearing.
3. The guide post of claim 2, wherein the bearing rod is provided with concentric large-head cylindrical structures or coaxial small bearing structures at both ends.
4. The guide post of claim 2, wherein the resilient member is a spring.
5. The guide post of claim 1, wherein the rolling bearing is a deep groove ball bearing.
6. The guide post of claim 1, wherein the first frame, the second frame, and the third frame are all steel plate frames.
7. A battery pack guiding system comprising the guide post of any one of claims 1-6, further comprising:
the battery pack bracket is fixedly arranged on the battery pack bracket in pairs, and a buffer rubber pad is arranged on the battery pack bracket;
the battery pack frame is provided with a second panel at the contact part of the battery pack frame and the first panel.
8. The battery pack guide system of claim 7 wherein one end of the second panel has a bevel.
9. The battery pack guiding system as claimed in claim 7, wherein the second panel is provided with a plurality of fifth through holes having a larger outer portion and a smaller inner portion, and the second panel is fixed to the battery pack frame through the fifth through holes.
10. The battery pack guidance system of claim 7, wherein the first panel and the second panel are both a composite wear resistant material.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210364012.7A CN114801844A (en) | 2022-04-07 | 2022-04-07 | Guide post and battery pack guiding system with same |
| PCT/CN2023/073518 WO2023193510A1 (en) | 2022-04-07 | 2023-01-28 | Guide post, and battery pack guide system having same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210364012.7A CN114801844A (en) | 2022-04-07 | 2022-04-07 | Guide post and battery pack guiding system with same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114801844A true CN114801844A (en) | 2022-07-29 |
Family
ID=82534313
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210364012.7A Pending CN114801844A (en) | 2022-04-07 | 2022-04-07 | Guide post and battery pack guiding system with same |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN114801844A (en) |
| WO (1) | WO2023193510A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023193510A1 (en) * | 2022-04-07 | 2023-10-12 | 中国华能集团清洁能源技术研究院有限公司 | Guide post, and battery pack guide system having same |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206672983U (en) * | 2016-12-23 | 2017-11-24 | 江苏罗思韦尔电气有限公司 | A kind of battery bag bracket |
| US10961097B1 (en) * | 2017-03-31 | 2021-03-30 | Rightline Equipment, Inc. | High visibility push-pull forklift attachment |
| CN216002166U (en) * | 2021-11-10 | 2022-03-11 | 南京普斯迪尔电子科技有限公司 | Heavily block battery package integrated type direction mount pad for buffering of bracket that charges |
| CN217259668U (en) * | 2022-04-07 | 2022-08-23 | 中国华能集团清洁能源技术研究院有限公司 | Guide post and battery pack guiding system with same |
| CN114801844A (en) * | 2022-04-07 | 2022-07-29 | 中国华能集团清洁能源技术研究院有限公司 | Guide post and battery pack guiding system with same |
-
2022
- 2022-04-07 CN CN202210364012.7A patent/CN114801844A/en active Pending
-
2023
- 2023-01-28 WO PCT/CN2023/073518 patent/WO2023193510A1/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023193510A1 (en) * | 2022-04-07 | 2023-10-12 | 中国华能集团清洁能源技术研究院有限公司 | Guide post, and battery pack guide system having same |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2023193510A1 (en) | 2023-10-12 |
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