Balance car for children

Abstract

The utility model provides a child balance car, which belongs to the technical field of child cars and comprises a frame, a front wheel and two rear wheels. The first rear wheel is detachably mounted on the first side of the frame through a first rear wheel bracket; the second rear wheel is detachably mounted on the second side of the frame through a second rear wheel bracket; the first rear wheel support can be installed on the second side of the frame after being detached from the first side of the frame, and the second rear wheel support can be installed on the first side of the frame after being detached from the second side of the frame. The first rear wheel bracket and the second rear wheel bracket are rotatably connected with the frame respectively, and the first rear wheel bracket and the second rear wheel bracket can be folded towards the direction of the front wheel on the frame through rotation; according to the child balance car provided by the utility model, the two rear wheel brackets are mounted on the symmetrical sides after being detached, so that the conversion between a two-wheel form and a three-wheel form can be realized, and the two rear wheel brackets can rotate on the car frame, so that the two rear wheel brackets are folded towards the direction of the car frame and are convenient to store.

Description

Technical Field

[0001] The utility model relates to the technical field of children's bicycles, in particular to a children's balance bike. Background Art

[0002] Generally speaking, balance bikes are suitable for children aged 2 to 6. Its main functional feature is that it has no pedal chain, and children can control the speed with their feet and slide by inertia, thus exercising children's balance and reaction abilities.

[0003] Balance bikes include two-wheel balance bikes and three-wheel balance bikes. Among them, three-wheel balance bikes are suitable for younger children, such as about one and a half years old. At this time, due to the insufficient physical development of the child, there is not enough strength to step on the pedals, and on the three-wheel balance bike, the child can slowly control the speed and balance with their feet. However, since the age range covered by three-wheel balance bikes is too short, generally families will omit them and directly buy two-wheel balance bikes after the child is over two years old, resulting in the child having no bike to ride for about a year.

[0004] In the prior art, there have emerged balance bikes with variable forms, that is, balance bikes can be converted between two-wheel and three-wheel forms, so as to meet the needs of children in lower age groups.

[0005] However, for the existing balance bikes that can be converted in form, although the size of the bike model is relatively small, it still occupies a large area when placed at home, and there is a problem of being not conducive to storage. Summary of the Utility Model

[0006] Therefore, the technical problem to be solved by the utility model is to overcome the defect that the existing children's balance bike is not conducive to storage, so as to provide a children's balance bike.

[0007] To solve the above technical problem, the utility model provides a children's balance bike, including:

[0008] A frame;

[0009] A front wheel, mounted on the frame;

[0010] A first rear wheel bracket, detachably connected to the first side of the frame, and the first rear wheel bracket has a first free end that extends obliquely away from the frame;

[0011] A first rear wheel, rotatably connected to the first free end of the first rear wheel bracket;

[0012] A second rear wheel bracket, detachably connected to the second side of the frame, and the second rear wheel bracket has a second free end that extends obliquely away from the frame;

[0013] The second rear wheel is rotatably connected to the second free end of the second rear wheel bracket;

[0014] After the first rear wheel bracket is removed from the first side of the vehicle frame, it can be installed on the second side of the vehicle frame, and the first free end of the first rear wheel bracket extends towards the direction close to the vehicle frame; after the second rear wheel bracket is removed from the second side of the vehicle frame, it can be installed on the first side of the vehicle frame, and the second free end of the second rear wheel bracket extends towards the direction close to the vehicle frame; when the first rear wheel bracket is installed on the second side of the vehicle frame and the second rear wheel bracket is installed on the first side of the vehicle frame, the distance between the first rear wheel and the second rear wheel becomes smaller to form a state where the two wheels are juxtaposed and abutted;

[0015] The first rear wheel bracket and the second rear wheel bracket are respectively rotatably connected to the vehicle frame, and the first rear wheel bracket and the second rear wheel bracket can be folded towards the front wheel direction by rotation on the vehicle frame.

[0016] Optionally, a mounting bracket is connected to the vehicle frame, and the mounting bracket has two cylindrical connecting portions extending towards both sides of the vehicle frame, and the two cylindrical connecting portions are respectively used for connecting the first rear wheel bracket and the second rear wheel bracket.

[0017] Optionally, the cylindrical connecting portion has a first guiding structure and a first locking structure, the first guiding structure is used to make the first rear wheel bracket and the second rear wheel bracket slide along the extending direction of the cylindrical connecting portion, and the first locking structure is used to lock the first rear wheel bracket or the second rear wheel bracket when it slides to the installation position along the first guiding structure.

[0018] Optionally, the first guiding structure includes: a strip-shaped groove provided along the extending direction of the cylindrical connecting portion in the circumferential direction of the cylindrical connecting portion, and the first rear wheel bracket and the second rear wheel bracket have bumps for inserting into the strip-shaped groove.

[0019] Optionally, there are at least two of the strip-shaped grooves spaced apart in the circumferential direction of the cylindrical connecting portion.

[0020] Optionally, the first locking structure includes: a first locking block elastically protruding outwards in the radial direction along the circumferential direction of the cylindrical connecting portion, and the first rear wheel bracket and the second rear wheel bracket have first locking holes for inserting into the first locking block.

[0021] Optionally, the mounting bracket includes: a connecting cylinder and a rotating shaft. The connecting cylinder is mounted on the vehicle frame, and the rotating shaft is rotatably mounted on the connecting cylinder. Both ends of the rotating shaft extend out of the connecting cylinder respectively, thereby forming two cylindrical connecting parts for connecting the first rear wheel bracket and the second rear wheel bracket.

[0022] Optionally, a second guiding structure and a second locking structure are provided between the connecting cylinder and the rotating shaft. The second guiding structure is arranged along the circumferential direction of the connecting cylinder and is used for guiding the rotation of the rotating shaft relative to the connecting cylinder. The second locking structure is used for locking the rotation angle of the first rear wheel bracket or the second rear wheel bracket.

[0023] Optionally, the second guiding structure includes: guiding holes arranged along the circumferential direction on the connecting cylinder. On the circumference of the rotating shaft, there are limiting blocks protruding outward in the radial direction, and the limiting blocks are slidably restricted in the guiding holes.

[0024] Optionally, the second locking structure includes: second locking blocks elastically protruding outward in the radial direction along the circumference of the rotating shaft. On the connecting cylinder, there are second locking holes for inserting the second locking blocks, and there are at least two second locking holes arranged at intervals along the circumferential direction of the connecting cylinder.

[0025] The technical solution of the present utility model has the following advantages:

[0026] 1. For the children's balance bike provided by the present utility model, the two rear wheel brackets can be removed and installed on the symmetrical side, so as to realize the transformation between the two-wheel and three-wheel forms. The two rear wheel brackets can be rotated on the vehicle frame, so as to realize the folding of the two rear wheel brackets towards the vehicle frame direction, making it convenient for storage.

[0027] 2. For the children's balance bike provided by the present utility model, when in the two-wheel form, the rear wheels are double wheels, which can make the vehicle stand independently and stably, and it is more stable and easier to control when riding. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0029] Figure 1 It is a perspective view of a specific embodiment of the children's balance bike provided in the embodiment of the present utility model;

[0030] Figure 2 ForFigure 1 Enlarged view of area A;

[0031] Figure 3 is Figure 1 Schematic diagram of the two-wheel state of the children's balance bike in

[0032] Figure 4 is Figure 1 Schematic diagram of the folded state of the children's balance bike in

[0033] Figure 5 is Figure 1 Exploded view of a partial area in

[0034] Figure 6 is Figure 5 Enlarged view of area B in

[0035] Figure 7 is Figure 1 Schematic diagram of the mounting bracket in

[0036] Figure 8 is Figure 7 Schematic diagram of the connecting cylinder in

[0037] Figure 9 is Figure 7 Schematic diagram of the rotating shaft in

[0038] Figure 10 is Figure 7 Cross-sectional schematic view along the central axis;

[0039] Figure 11 is Figure 7 Stereogram from the bottom view angle of

[0040] Explanation of reference numerals:

[0041] 1. Frame; 2. Front wheel; 3. First rear wheel; 4. Second rear wheel; 5. First rear wheel bracket; 6. Second rear wheel bracket; 7. Mounting bracket; 8. Connecting cylinder; 9. Rotating shaft; 10. Strip-shaped groove; 11. Bump; 12. First locking block; 13. First locking hole; 14. Guide hole; 15. First limiting block; 16. Guide groove; 17. Second limiting block; 18. Second locking block; 19. Second locking hole. Detailed implementation manners

[0042] Next, the technical solutions of the present utility model will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0043] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0044] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0045] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0046] As Figure 1 、 Figure 2 shown, a specific embodiment of the children's balance bike provided in this embodiment includes: a frame 1, a front wheel 2, a first rear wheel 3 and a second rear wheel 4, a first rear wheel bracket 5 and a second rear wheel bracket 6. The front wheel 2 is installed on the frame 1. The first rear wheel 3 is detachably installed on the first side of the frame 1 through the first rear wheel bracket 5. The second rear wheel 4 is detachably installed on the second side of the frame 1 through the second rear wheel bracket 6. Specifically, the first rear wheel bracket 5 is detachably connected to the first side of the frame 1. The first rear wheel bracket 5 has a first free end that extends obliquely away from the frame. The first rear wheel 3 is rotatably connected to the first free end of the first rear wheel bracket 5. The second rear wheel bracket 6 is detachably connected to the second side of the frame 1. The second rear wheel bracket 6 has a second free end that extends obliquely away from the frame. The second rear wheel 4 is rotatably connected to the second free end of the second rear wheel bracket 6.

[0047] As Figure 1As shown, when the first rear wheel bracket 5 is installed on the first side of the frame 1 and the second rear wheel bracket 6 is installed on the second side of the frame 1, there is a certain interval between the first rear wheel 3 and the second rear wheel 4, so that the front wheel 2, the first rear wheel 3 and the second rear wheel 4 form a three-wheel structure, which is convenient for younger children to ride.

[0048] As Figure 3 shown, after the first rear wheel bracket 5 is removed from the first side of the frame 1, it can be installed on the second side of the frame 1, and the first free end of the first rear wheel bracket 5 extends toward the direction close to the frame; after the second rear wheel bracket 6 is removed from the second side of the frame 1, it can be installed on the first side of the frame 1, and the second free end of the second rear wheel bracket 6 extends toward the direction close to the frame; when the first rear wheel bracket 5 is installed on the second side of the frame 1 and the second rear wheel bracket 6 is installed on the first side of the frame 1, the distance between the first rear wheel 3 and the second rear wheel 4 becomes smaller to form a state where the two rear wheels are juxtaposed and abutted; at this time, the front wheel 2, the first rear wheel 3 and the second rear wheel 4 form a two-wheel structure, which is convenient for older children to ride.

[0049] As Figure 4 shown, the first rear wheel bracket 5 and the second rear wheel bracket 6 are respectively rotatably connected to the frame 1, and the first rear wheel bracket 5 and the second rear wheel bracket 6 can be folded toward the front wheel 2 direction by rotation on the frame 1.

[0050] The children's balance bike provided in this embodiment can remove the two rear wheel brackets and install them on the symmetrical sides, so as to realize the transformation between the two-wheel and three-wheel forms. The two rear wheel brackets can be rotated on the frame 1, so as to realize the folding of the two rear wheel brackets toward the frame 1 direction, making it convenient for storage.

[0051] As Figure 2 、 Figure 5 shown, in this embodiment, an installation bracket 7 is connected to the frame 1, and the installation bracket 7 has two cylindrical connection parts extending toward both sides of the frame 1, and the two cylindrical connection parts are respectively used for connecting the first rear wheel bracket 5 and the second rear wheel bracket 6. Specifically, in this embodiment, the two cylindrical connection parts respectively extend horizontally toward both sides of the frame 1. When disassembling the first rear wheel bracket 5 and the second rear wheel bracket 6, insert or pull out from the extension ends of the cylindrical connection parts, so as to improve the disassembly and installation efficiency of the two rear wheel brackets.

[0052] As Figure 2 、 Figure 5As shown in the figure, in this embodiment, the cylindrical connecting portion is provided with a first guiding structure, and the first guiding structure includes: a strip-shaped groove 10 disposed along the extending direction of the cylindrical connecting portion in the circumferential direction of the cylindrical connecting portion. The first rear wheel bracket 5 and the second rear wheel bracket 6 are provided with bumps 11 for inserting into the strip-shaped groove 10. When installing or disassembling the two rear wheel brackets, the bumps 11 are inserted or pulled out along the strip-shaped groove 10 from the extending end of the cylindrical connecting portion, so as to ensure the fixing of the installation angle between the two rear wheel brackets and the cylindrical connecting portion, and avoid the problem that the two rear wheel brackets rotate on the cylindrical connecting portion.

[0053] As Figure 2 , Figure 5 shown in the figure, in this embodiment, there are three strip-shaped grooves 10 disposed at intervals in the circumferential direction of the cylindrical connecting portion. The bumps 11 are arranged in one-to-one correspondence with the strip-shaped grooves 10, and the length of the bumps 11 is adapted to the length of the strip-shaped grooves 10. With such a setting, the circumferential direction of the two rear wheel brackets can be limited, and the problem that the two rear wheel brackets are inserted too far towards the cylindrical connecting portion can be prevented. Of course, the above description is not restrictive. In some alternative embodiments, the number of the strip-shaped grooves 10 can also be set to only two, or more can be set, etc.

[0054] As Figure 6 , Figure 7 shown in the figure, in this embodiment, the cylindrical connecting portion is provided with a first locking structure, and the first locking structure is used to lock the first rear wheel bracket 5 or the second rear wheel bracket 6 when it slides along the first guiding structure to the installation position. Specifically, the first locking structure includes: a first locking block 12 elastically protruding outward in the radial direction along the circumferential direction of the cylindrical connecting portion. The first rear wheel bracket 5 and the second rear wheel bracket 6 are provided with first locking holes 13 for inserting the first locking block 12. During the process of the two rear wheel brackets being sleeved into the cylindrical connecting portion inward, when the two rear wheel brackets are sleeved in place, the positions of the first locking block 12 and the first locking holes 13 are opposite, and the first locking block 12 is inserted into the first locking holes 13 under the action of elastic force, so as to complete the locking of the two rear wheel brackets. When unlocking, the first locking block 12 can be manually pressed downward to unlock. In this embodiment, the first locking block 12 and the cylindrical connecting portion are integrally formed elastic bodies. Of course, the above description is not restrictive. In some alternative embodiments, the first locking block 12 can also adopt a structure separated from the cylindrical connecting portion, and then an elastic member is used to provide the required elastic force, etc.

[0055] As Figure 7 - 9As shown in the figure, in this embodiment, the mounting bracket 7 includes a connecting cylinder 8 and a rotating shaft 9. The connecting cylinder 8 is mounted on the vehicle frame 1, and the rotating shaft 9 is rotatably mounted on the connecting cylinder 8. Both ends of the rotating shaft 9 extend out of the connecting cylinder 8 respectively, thus forming two cylindrical connecting parts for connecting the first rear wheel bracket 5 and the second rear wheel bracket 6. That is to say, in this embodiment, the two cylindrical connecting parts are formed by the two end parts of the rotating shaft 9. With such a setting, the synchronism of the rotation of the two cylindrical connecting parts and the overall stability can be ensured.

[0056] As Figure 7 shown in the figure, in this embodiment, there is a second guiding structure between the connecting cylinder 8 and the rotating shaft 9. The second guiding structure is arranged along the circumferential direction of the connecting cylinder 8 and is used to guide the rotation of the rotating shaft 9 relative to the connecting cylinder 8. The second guiding structure includes: guiding holes 14 arranged along the circumferential direction on the connecting cylinder 8, and on the circumference of the rotating shaft 9, there are first limiting blocks 15 protruding outward in the radial direction. The first limiting blocks 15 are slidably restricted in the guiding holes 14. The second guiding structure further includes: guiding grooves 16 arranged along the circumferential direction on the connecting cylinder 8, and on the circumference of the rotating shaft 9, there are second limiting blocks 17 protruding outward in the radial direction. The second limiting blocks 17 are slidably restricted in the guiding grooves 16. The first limiting blocks 15 and the second limiting blocks 17 are arranged side by side, and the guiding holes 14 and the guiding grooves 16 are arranged in parallel side by side. With such a setting, the smoothness of the rotation of the rotating shaft 9 on the connecting cylinder 8 can be further improved. Of course, the above description is not restrictive. In some alternative embodiments, only one of the structures of the guiding holes 14 and the guiding grooves 16 can be provided.

[0057] As Figure 7 , Figure 10 shown in the figure, in this embodiment, there is a second locking structure between the connecting cylinder 8 and the rotating shaft 9. The second locking structure is used to lock the rotation angle of the first rear wheel bracket 5 or the second rear wheel bracket 6. The second locking structure includes: a second locking block 18 elastically protruding outward in the radial direction along the circumference of the rotating shaft 9, and on the connecting cylinder 8, there is a second locking hole 19 for inserting the second locking block 18; during use, when the rotating shaft 9 rotates to a specific angle on the connecting cylinder 8, that is, when the second locking block 18 is opposite to the second locking hole 19, the second locking block 18 elastically protrudes outward, and thus inserts into the second locking hole 19. When unlocking, press the second locking block 18 inward externally, and then rotate the connecting cylinder 8 to misalign the second locking block 18 with the second locking hole 19, thereby unlocking the locking between the connecting cylinder 8 and the rotating shaft 9.

[0058] AsFigure 10 As shown, in this embodiment, the second locking block 18 is detachably connected to the rotating shaft 9, and an elastic member is connected to the second locking block 18. The elastic member has an elastic force that drives the second locking block 18 to protrude outward. With this arrangement, it is convenient to repair and replace the second locking block 18. Of course, the above description is not restrictive. In some alternative embodiments, the second locking block 18 can also be integrally formed with the rotating shaft 9, and then the second locking block 18 elastically protrudes from the body of the rotating shaft 9.

[0059] As Figure 11 shown, in this embodiment, the second locking holes 19 are provided in two at intervals along the circumferential direction of the connecting cylinder 8. With this arrangement, the connection between the connecting cylinder 8 and the rotating shaft 9 can be locked at two rotational angle positions respectively. Thus, the two rear wheel brackets can be locked both at the working position far from the front wheel 2 and at the storage position close to the front wheel 2. Of course, the above description is not restrictive. In some alternative embodiments, only one locking position can also be provided. For example, it can be locked only at the working position, etc.

[0060] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A children's balance bike, characterized in that, Comprising: Frame (1); Front wheel (2), mounted on the frame (1); First rear wheel bracket (5), detachably connected to the first side of the frame (1), the first rear wheel bracket (5) having a first free end extending obliquely away from the frame; First rear wheel (3), rotatably connected to the first free end of the first rear wheel bracket (5); Second rear wheel bracket (6), detachably connected to the second side of the frame (1), the second rear wheel bracket (6) having a second free end extending obliquely away from the frame; Second rear wheel (4), rotatably connected to the second free end of the second rear wheel bracket (6); After the first rear wheel bracket (5) is removed from the first side of the frame (1), it can be installed on the second side of the frame (1), and the first free end of the first rear wheel bracket (5) extends towards the direction close to the frame; after the second rear wheel bracket (6) is removed from the second side of the frame (1), it can be installed on the first side of the frame (1), and the second free end of the second rear wheel bracket (6) extends towards the direction close to the frame; when the first rear wheel bracket (5) is installed on the second side of the frame (1) and the second rear wheel bracket (6) is installed on the first side of the frame (1), the distance between the first rear wheel (3) and the second rear wheel (4) becomes smaller to form a state of double wheels juxtaposed and abutted; The first rear wheel bracket (5) and the second rear wheel bracket (6) are respectively rotatably connected to the frame (1), and the first rear wheel bracket (5) and the second rear wheel bracket (6) can be folded towards the direction of the front wheel (2) by rotation on the frame (1).

2. The children's balance bike according to claim 1, characterized in that, An installation bracket (7) is connected to the frame (1), and the installation bracket (7) has two cylindrical connection parts extending towards both sides of the frame (1), and the two cylindrical connection parts are respectively used for connecting the first rear wheel bracket (5) and the second rear wheel bracket (6).

3. The children's balance bike according to claim 2, wherein, The cylindrical connection part has a first guiding structure and a first locking structure, the first guiding structure is used for enabling the first rear wheel bracket (5) and the second rear wheel bracket (6) to slide along the extending direction of the cylindrical connection part, and the first locking structure is used for locking the first rear wheel bracket (5) or the second rear wheel bracket (6) when it slides to the installation position along the first guiding structure.

4. The children's balance bike according to claim 3, wherein, The first guiding structure includes: a strip-shaped groove (10) arranged along the extending direction of the cylindrical connection part in the circumferential direction of the cylindrical connection part, and the first rear wheel bracket (5) and the second rear wheel bracket (6) are provided with bumps (11) for inserting into the strip-shaped groove (10).

5. The children's balance bike according to claim 4, wherein, There are at least two of the strip-shaped grooves (10) arranged at intervals in the circumferential direction of the cylindrical connection part.

6. The children's balance bike according to claim 3, wherein, The first locking structure includes: a first locking block (12) that elastically protrudes outward in the radial direction along the circumferential direction of the cylindrical connecting portion, and the first rear wheel bracket (5) and the second rear wheel bracket (6) are provided with first locking holes (13) for inserting the first locking block (12).

7. The children's balance bike according to any one of claims 2-6, characterized in that, The mounting bracket (7) includes: a connecting cylinder (8) and a rotating shaft (9), the connecting cylinder (8) is mounted on the vehicle frame (1), the rotating shaft (9) is rotatably mounted on the connecting cylinder (8), and both ends of the rotating shaft (9) extend out of the connecting cylinder (8) respectively to form two cylindrical connecting portions for connecting the first rear wheel bracket (5) and the second rear wheel bracket (6).

8. The children's balance bike according to claim 7, wherein, A second guiding structure and a second locking structure are provided between the connecting cylinder (8) and the rotating shaft (9). The second guiding structure is arranged along the circumferential direction of the connecting cylinder (8) and is used for guiding the rotation of the rotating shaft (9) relative to the connecting cylinder (8), and the second locking structure is used for locking the rotation angle of the first rear wheel bracket (5) or the second rear wheel bracket (6).

9. The children's balance bike according to claim 8, wherein, The second guiding structure includes: a guiding hole (14) arranged along the circumferential direction on the connecting cylinder (8), and a limiting block that protrudes outward in the radial direction along the circumferential direction of the rotating shaft (9), and the limiting block is slidably limited in the guiding hole (14).

10. The children's balance bike according to claim 8 or 9, characterized in that, The second locking structure includes: a second locking block (18) that elastically protrudes outward in the radial direction along the circumferential direction of the rotating shaft (9), the connecting cylinder (8) is provided with second locking holes (19) for inserting the second locking block (18), and at least two of the second locking holes (19) are arranged at intervals along the circumferential direction of the connecting cylinder (8).

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