A hinge device for an electrically operated counter door

Abstract

The present application relates to the technical field of automobile accessories, and particularly relates to a hinge device of an electrically-driven double-leaf door, which comprises a vehicle body leaf installed on a C column of a vehicle body and a door leaf installed on a door, a connecting bracket is arranged on the door leaf, the vehicle body leaf is hingedly connected with the connecting bracket through a pin shaft, the connecting bracket and the pin shaft are fixedly connected through Y-shaped countersunk head screws, and one end of the pin shaft is fixedly connected with the connecting bracket; the hinge device further comprises a driving device, which is in transmission connection with the pin shaft and is used for driving the pin shaft to rotate, so as to drive the door leaf to rotate relative to the vehicle body leaf, and realize electrically-driven opening and closing of the door. The hinge device of the electrically-driven double-leaf door can realize direct docking of the driving device and the electrically-driven double-leaf door hinge, and simultaneously solve the problem that the narrow space of the C column is not conducive to installation of the hinge, and is convenient for installation and adjustment of tolerance.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts technology, and in particular to a hinge device for an electric double door. Background Technology

[0002] Currently, most traditional car doors are manually opened from the same side, with electric suicide door structures only found in a few high-end models, offering advantages such as unique styling and convenient entry and exit. The rear door hinges of these models are typically installed on the C-pillar, enabling the front and rear doors to open in opposite directions. However, due to the limited space inside the C-pillar and the constraints of the overall vehicle design, existing electric suicide door hinges have several problems: First, traditional hinges are mostly one-piece structures, making installation difficult in confined spaces; second, they rely on electric struts for electric opening and closing, but these struts are bulky, occupying C-pillar space and being limited by the vehicle's styling; third, the hinge pins are mostly riveted structures, not removable, requiring complete replacement if damaged, resulting in high repair costs. Therefore, there is an urgent need for a structurally sound, easy-to-install and maintain electric suicide door hinge device to adapt to the demands of compact spaces and intelligent features. Utility Model Content

[0003] In view of the above-mentioned shortcomings of current automotive double-door hinge devices, the present invention provides an electric double-door hinge device that enables direct connection between the drive device and the electric double-door hinge, while solving the problem that the narrow space of the C-pillar is not conducive to hinge installation, and facilitating installation and tolerance adjustment.

[0004] To achieve the above objectives, the embodiments of this utility model adopt the following technical solutions:

[0005] A hinge device for an electric double-door includes a body panel mounted on the C-pillar of the vehicle body and a door panel mounted on the door. The door panel has a connecting bracket, and the body panel is hinged to the connecting bracket via a pin. The connecting bracket is fixedly connected to one end of the pin using a Y-type countersunk screw, and the other end of the pin is fixedly connected to the connecting bracket. The device also includes a drive unit, which is kinetically connected to the pin and drives the pin to rotate, thereby causing the door panel to rotate relative to the body panel, thus realizing the electric opening and closing of the door.

[0006] According to one aspect of the present invention, the driving device includes a motor mounted on one side of the vehicle body, a gear being provided at the output end of the motor, and a gear plate being provided at one end of the pin shaft, the gear being meshed with the gear plate.

[0007] According to one aspect of the present invention, the pin is connected to the gear plate via a motor drive shaft, one end of the pin is provided with a toothed interface, and one end of the motor drive shaft is connected to the toothed interface.

[0008] According to one aspect of the present invention, the drive device includes a front housing and a rear housing, and the gear and the gear plate are mounted in an internal cavity formed by the front housing and the rear housing.

[0009] According to one aspect of the present invention, the door leaf is provided with a protrusion, and the connecting bracket is provided with a groove that matches the protrusion.

[0010] According to one aspect of the present invention, the pin includes a pin head and a pin tail, the pin tail is provided with straight-knotted teeth, and the pin is fixedly connected to the connecting bracket by the straight-knotted teeth.

[0011] According to one aspect of the present invention, a sleeve is fitted onto the head of the pin, and the sleeve is screwed to the Y-type countersunk screw.

[0012] According to one aspect of the present invention, a bushing is fitted onto the sleeve, and the bushing is connected to the vehicle body panel.

[0013] According to one aspect of the present invention, the vehicle body panel includes a vehicle body panel mounting base plate, a hinge column, and a vehicle body panel connecting portion. The hinge column is disposed on the vehicle body panel mounting base plate, and the vehicle body panel connecting portion is disposed on the vehicle body panel mounting base plate and connected to the hinge column. A reinforcing rib is provided at the connection between the vehicle body panel connecting portion and the vehicle body panel mounting base plate.

[0014] According to one aspect of the present invention, the door panel includes a door panel mounting base plate and a hinge arm, one end of the hinge arm being disposed on the door panel mounting base plate, and the other end of the hinge arm being connected to the connecting bracket.

[0015] Advantages of this invention: The separate structure of the door leaf and the connecting bracket adapts to the relatively narrow installation environment of the C-pillar, facilitating installation by operators. This separate structure also benefits hinge installation and tolerance adjustment. The use of a male-female interlocking structure at the connection between the door leaf and the connecting bracket enhances the strength of the separate structure and extends its service life. The pin head uses a Y-type countersunk bolt connected to a sleeve, effectively preventing the pin from coming out. A knurled tooth is provided at the tail of the pin, connecting to the thread in the connecting hole of the connecting bracket. The drive device drives the pin to rotate, which in turn drives the connecting bracket to rotate, thus opening and closing the door. The use of a larger gear plate and gear meshing effectively reduces gear speed and increases torque. The hinge device for an electric double-opening door provided by this invention enables direct connection between the drive device and the electric double-opening door hinge, solving the problem of limited space in the C-pillar hindering hinge installation, facilitating installation and tolerance adjustment, and reducing manufacturing and maintenance costs. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a three-dimensional structural diagram of the hinge device for an electric double door according to the present invention;

[0018] Figure 2 This is an exploded view of the hinge device for an electric double door according to the present invention;

[0019] Figure 3 This is an exploded view of the drive device of the hinge mechanism for an electric double door according to the present invention.

[0020] The labels in the diagram:

[0021] 1. Body panel; 11. Body panel mounting base plate; 12. Hinge column; 13. Reinforcing rib; 14. Body panel connecting part; 2. Door panel; 21. Door panel mounting base plate; 22. Hinge arm; 23. Protrusion; 3. Drive unit; 31. Front shell; 32. Rear shell; 33. Motor; 34. Gear; 35. Motor drive shaft; 36. Gear disc; 4. Connecting bracket; 41. Groove; 5. Pin; 51. Straight-knitted teeth; 52. Pin head; 53. Pin tail; 6. Bushing; 7. Sleeve; 8. Washer; 9. Bolt; 10. Y-type countersunk screw. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0025] Example 1

[0026] like Figure 1 , Figure 2 and Figure 3 As shown, an electric double-door hinge device is primarily suitable for double-door automobiles, especially for installation on C-pillar doors. It includes a body panel 1 mounted on the C-pillar and a door panel 2 mounted on the door. Body panel 1 and door panel 2 are typically fixed to the vehicle body and door by bolts or screws. The door panel 2 has a connecting bracket 4, and the door panel 2 is fixed to the connecting bracket 4 by bolts 9. The body panel 1 is hinged to the connecting bracket 4 via a pin 5, and the connecting bracket 4 and the pin 5 are fixedly mounted by Y-type countersunk screws, with one end of the pin 5 fixedly connected to the connecting bracket 4. It also includes a drive device 3, which is kinetically connected to the pin 5 and drives the pin 5 to rotate, thereby causing the door panel 2 to rotate relative to the body panel 1, realizing the electric opening and closing of the door. The door opening angle is over 90°. The driving method of the driving device 3 is not limited, as long as it can drive the pin shaft to rotate. It can be implemented by direct motor drive, motor and gear or worm gear connection, etc.

[0027] In this embodiment, a sleeve 7 is fitted onto the head 52 of the pin, and a bushing 6 is fitted onto the sleeve 7. The bushing 6 is connected to the body panel 1, and the sleeve 7 is screwed to the Y-type countersunk screw 10. Preferably, a washer 8 is provided at one end of the sleeve 7, and the washer 8 is located at the end away from the Y-type countersunk screw 10, and the washer is located between the body panel 1 and the connecting bracket 4. After the sleeve 7 abuts against the washer, the Y-type countersunk screw passes through the sleeve 7, fastening the sleeve 7 to the pin and preventing the pin 5 from coming out. The bushing 6 reduces the friction between the pin 5 and the body panel 1, while buffering the vibration of the door and positioning the pin 5, effectively enhancing the wear resistance of the hinge device and extending its service life. The washer controls the device gap and improves the durability of the hinge.

[0028] In this embodiment, the body panel 1 includes a body panel mounting base plate 11, a hinge pillar 12, and a body panel connecting portion 14. The hinge pillar 12 is disposed on the body panel mounting base plate 11, and the body panel connecting portion 14 is disposed on the body panel mounting base plate 11 and connected to the hinge pillar 12. A reinforcing rib 13 is provided at the connection between the body panel connecting portion 14 and the body panel mounting base plate 11. The body panel mounting base plate 11 is provided with mounting holes to facilitate the mounting of the body panel 1 to the C-pillar of the vehicle using bolts. The reinforcing rib enhances the strength of the body panel and improves its service life.

[0029] In this embodiment, the door panel 2 includes a door panel mounting base plate 21 and a hinge arm 22. One end of the hinge arm 22 is disposed on the door panel mounting base plate 21, and the other end of the hinge arm 22 is connected to the connecting bracket 4. The door panel mounting base plate 21 is provided with mounting holes to facilitate the installation of the door panel 2 on the door using bolts.

[0030] In this embodiment, the door panel 2 is provided with a protrusion 23. Specifically, the protrusion 23 is located at the end where the hinge arm 22 connects to the connecting bracket 4. The connecting bracket 4 is provided with a groove 41 that matches the protrusion 23. Through the interlocking design of the protrusion 23 and the groove 41, the negative impact of the split structure (i.e., the split structure between the door panel 2 and the connecting bracket 4) on the strength can be minimized, ensuring its strength. The split structure of the connecting bracket 4 and the door panel 2 makes it easier to remove the rear sheet metal for hinge installation and adjustment when there is insufficient space inside the C-pillar.

[0031] In this embodiment, the pin 5 includes a pin head 52 and a pin tail 53. The pin tail 53 is provided with knurled teeth 51, and the pin 5 is fixedly connected to the connecting bracket 4 through the knurled teeth 51. The connecting hole of the connecting bracket 4 is provided with a thread that matches the knurled teeth 51. This thread is processed by an extrusion process, which can effectively improve the strength and wear resistance of the thread. The pin 5 passes through the body panel 1 and the connecting bracket 4, and is fixedly connected to the pin tail 53 by the knurled teeth 51.

[0032] The advantages of this embodiment are as follows: the separate structure of the door panel and the connecting bracket adapts to the relatively narrow installation environment of the C-pillar, facilitating installation by operators. This separate structure also facilitates hinge installation and tolerance adjustment. The use of a male-female interlocking structure at the connection between the door panel and the connecting bracket enhances the strength of the separate structure and extends its service life. The pin head uses a Y-type countersunk bolt connected to a sleeve, effectively preventing the pin from coming out. A knurled tooth is provided at the tail of the pin, which connects to the thread in the connecting hole of the connecting bracket. A drive device drives the pin to rotate, which in turn drives the connecting bracket to rotate, thereby opening and closing the door. The hinge device for the electric double-door in this embodiment achieves direct docking between the drive unit and the electric double-door hinge, perfectly solving the problem of the large space occupation of the electric strut drive structure. Direct drive of the hinge by the drive unit effectively saves space, while ensuring the hinge's strength, functionality, and reliability. Furthermore, the rotating arm of the electric double-door hinge adopts a unique split-type male-female interlocking structure, effectively reducing the assembly difficulty during vehicle installation and minimizing the strength reduction caused by component separation. The overall modular design facilitates easy assembly and disassembly, reduces manufacturing costs, allows for parts replacement, and minimizes maintenance costs.

[0033] Example 2

[0034] like Figure 1 , Figure 2 and Figure 3As shown, an electric double-door hinge device is primarily suitable for double-door cars, especially for installation on C-pillar doors. It includes a body panel 1 mounted on the C-pillar and a door panel 2 mounted on the door, typically fixed to the car body and door by bolts or screws. The door panel 2 has a connecting bracket 4, and the door panel 2 is fixed to the connecting bracket 4 by bolts 9. The body panel 1 is hinged to the connecting bracket 4 via a pin 5, and the connecting bracket 4 and the pin 5 are fixedly mounted by Y-type countersunk screws, with one end of the pin 5 fixedly connected to the connecting bracket 4. It also includes a drive device 3, which is kinetically connected to the pin 5 and drives the pin 5 to rotate, thereby causing the door panel 2 to rotate relative to the body panel 1, achieving electric opening and closing of the door. The door opening angle is over 90°. The overall design is modular, facilitating easy assembly and disassembly, reducing manufacturing costs, allowing for replaceable parts, and minimizing maintenance costs.

[0035] In this embodiment, the body panel 1 includes a body panel mounting base plate 11, a hinge pillar 12, and a body panel connecting portion 14. The hinge pillar 12 is disposed on the body panel mounting base plate 11, and the body panel connecting portion 14 is disposed on the body panel mounting base plate 11 and connected to the hinge pillar 12. A reinforcing rib 13 is provided at the connection between the body panel connecting portion 14 and the body panel mounting base plate 11. The body panel mounting base plate 11 is provided with mounting holes to facilitate the mounting of the body panel 1 to the C-pillar of the vehicle using bolts. The reinforcing rib enhances the strength of the body panel and improves its service life.

[0036] In this embodiment, the door panel 2 includes a door panel mounting base plate 21 and a hinge arm 22. One end of the hinge arm 22 is disposed on the door panel mounting base plate 21, and the other end of the hinge arm 22 is connected to the connecting bracket 4. The door panel mounting base plate 21 is provided with mounting holes to facilitate the installation of the door panel 2 on the door using bolts.

[0037] In this embodiment, the drive device 3 includes a motor 33 mounted on one side of the vehicle body 1. A gear 34 is provided at the output end of the motor 33, and a gear disc 36 is provided at one end of the pin shaft 5. The gear 34 meshes with the gear disc 36. The diameter of the gear disc 36 is larger than that of the gear 34, which effectively reduces the gear's rotational speed and increases torque.

[0038] In this embodiment, the pin 5 is connected to the gear disk 36 via a motor drive shaft 35. One end of the pin 5 is provided with a toothed interface, and one end of the motor drive shaft 35 is connected to the toothed interface. That is, one end of the motor drive shaft 35 is provided with a connecting part that mates with the toothed interface, and the gear disk 36 is fixedly installed on the other end of the motor drive shaft 35. Preferably, the motor drive shaft is installed at the center of the gear disk 36, and preferably, the gear disk 36 is fan-shaped.

[0039] In this embodiment, the drive device 3 includes a front housing 31 and a rear housing 32, and the gear 34 and the gear disc 36 are installed in the internal cavity formed by the front housing 31 and the rear housing 32. That is, the motor is installed on the outside of the housing, the output end of the motor extends into the internal cavity of the housing, and the motor drive shaft 35 passes through the rear housing 32 and is connected to one end of the pin 5.

[0040] In this embodiment, the motor 33 drives the gear 34 to rotate, which in turn drives the gear disk 36, which is meshed with it, to rotate. The rotation of the gear disk 36 drives the motor drive shaft 35, which is fixedly connected to it, to rotate, thereby driving the pin shaft 5 to rotate, thus realizing the rotation of the door panel 2 relative to the body panel 1.

[0041] In this embodiment, the door panel 2 is provided with a protrusion 23. Specifically, the hinge arm 22 is provided with a protrusion 23, and the connecting bracket 4 is provided with a groove 41 that matches the protrusion 23. Through the interlocking design of the protrusion 23 and the groove 41, the negative impact of the split structure (i.e., the split structure between the door panel 2 and the connecting bracket 4) on the strength reduction can be minimized, thus ensuring its strength.

[0042] In this embodiment, the pin 5 includes a pin head 52 and a pin tail 53. The pin tail 53 is provided with knurled teeth 51, and the pin 5 is fixedly connected to the connecting bracket 4 through the knurled teeth 51. The connecting hole of the connecting bracket 4 is provided with a thread that matches the knurled teeth 51. This thread is processed by an extrusion process, which can effectively improve the strength and wear resistance of the thread. The pin 5 passes through the body panel 1 and the connecting bracket 4, and is fixedly connected to the pin tail 53 by the knurled teeth 51.

[0043] In this embodiment, a sleeve 7 is fitted onto the head 52 of the pin, and a bushing 6 is fitted onto the sleeve 7. The bushing 6 is connected to the body panel 1, and the sleeve 7 is screwed to the Y-type countersunk screw 10. Preferably, a washer 8 is provided at one end of the sleeve 7, and the washer 8 is located at the end away from the Y-type countersunk screw 10, and the washer is located between the body panel 1 and the connecting bracket 4. After the sleeve 7 abuts against the washer, the Y-type countersunk screw passes through the sleeve 7, fastening the sleeve 7 to the pin and preventing the pin 5 from coming out. The bushing 6 reduces the friction between the pin 5 and the body panel 1, while buffering the vibration of the door and positioning the pin 5, effectively enhancing the wear resistance of the hinge device and extending its service life. The washer controls the device gap and improves the durability of the hinge.

[0044] In this embodiment, the tail end 53 of the pin is also connected to the body panel 2 via a bushing 6 to reduce friction between the pin 5 and the body panel 1.

[0045] The beneficial effects of this embodiment are as follows: by using a larger gear plate and gears for meshing connection, the rotational speed of the patented gears can be effectively controlled and the torque increased. At the same time, the larger gear plate and gear combination can withstand greater loads, further improving the durability and reliability of the hinge device. In practical applications, this improvement significantly reduces abnormal noises and jamming during door operation, enhancing the user experience.

[0046] Compared to traditional electric double-door hinges, the hinge device of this application for an electric double-door door lacks an intermediate connecting bracket. In installation environments with relatively narrow C-pillars, hinge installation is extremely difficult and time-consuming. This application, however, uses a split-type installation, which is not only simple to install but also easy to adjust installation tolerances.

[0047] Traditional electric double-door hinges require the installation of electric struts to achieve electric opening and closing of the doors. However, electric struts occupy a large amount of space, and the C-pillar space is related to the vehicle's shape, which is not conducive to vehicle styling design. This application adopts a method of directly connecting the drive unit to the hinge, which greatly reduces the space occupied, facilitates installation at the C-pillar position, and does not restrict the vehicle's shape.

[0048] Traditional electric double doors use a riveting system, which is inconvenient for disassembly. If the hinges are damaged, the entire hinge needs to be replaced, resulting in high maintenance costs. This application uses Y-type countersunk bolts and pin connections, which facilitates disassembly, repair, and replacement, greatly reducing maintenance costs.

[0049] The advantages of this utility model are as follows: The separate structure of the door leaf and the connecting bracket adapts to the relatively narrow installation environment of the C-pillar, facilitating installation by operators. This separate structure also benefits hinge installation and tolerance adjustment. The use of a male-female interlocking structure at the connection between the door leaf and the connecting bracket enhances the strength of the separate structure and extends its service life. The pin head uses a Y-type countersunk bolt connected to a sleeve, effectively preventing the pin from coming out. A knurled tooth is provided at the tail of the pin, connecting to the thread in the connecting hole of the connecting bracket. The drive device drives the pin to rotate, which in turn drives the connecting bracket to rotate, thus opening and closing the door. The use of a larger gear plate and gear meshing effectively reduces gear speed and increases torque. The hinge device for an electric double-opening door provided by this utility model enables direct connection between the drive device and the electric double-opening door hinge, solving the problem of limited space in the C-pillar hindering hinge installation, facilitating installation and tolerance adjustment, and reducing manufacturing and maintenance costs.

[0050] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A hinge device for an electric double-opening door, comprising a body panel (1) mounted on the C-pillar of the vehicle body and a door panel (2) mounted on the door, characterized in that, The door panel (2) is provided with a connecting bracket (4). The body panel (1) is hinged to the connecting bracket (4) via a pin (5). The connecting bracket (4) is fixedly connected to one end of the pin (5) via a Y-type countersunk screw, and the other end of the pin (5) is fixedly connected to the connecting bracket (4). The device also includes a drive device (3), which is connected to the pin (5) for driving the pin (5) to rotate, thereby driving the door panel (2) to rotate relative to the body panel (1) to realize the electric opening and closing of the door.

2. The hinge device for the electric double door according to claim 1, characterized in that, The drive device (3) includes a motor (33) installed on one side of the vehicle body (1). The output end of the motor (33) is provided with a gear (34), and one end of the pin (5) is provided with a gear plate (36). The gear (34) meshes with the gear plate (36).

3. The hinge device for an electric double door according to claim 2, characterized in that, The pin (5) is connected to the gear plate (36) via the motor drive shaft (35). One end of the pin (5) is provided with a toothed interface, and one end of the motor drive shaft (35) is connected to the toothed interface.

4. The hinge device for an electric double door according to claim 2, characterized in that, The drive device (3) includes a front housing (31) and a rear housing (32), and the gear (34) and the gear disk (36) are installed in the internal cavity formed by the front housing (31) and the rear housing (32).

5. The hinge device for an electric double door according to claim 1, characterized in that, The door panel (2) is provided with a protrusion (23), and the connecting bracket (4) is provided with a groove (41) that matches the protrusion (23).

6. The hinge device for an electric double door according to claim 1, characterized in that, The pin (5) includes a pin head (52) and a pin tail (53). The pin tail (53) is provided with straight-lined teeth (51). The pin (5) and the connecting bracket (4) are fixedly connected by the straight-lined teeth (51).

7. The hinge device for an electric double door according to claim 6, characterized in that, A sleeve (7) is fitted on the head (52) of the pin shaft, and the sleeve (7) is screwed to the Y-type countersunk screw (10).

8. The hinge device for an electric double door according to claim 7, characterized in that, A bushing (6) is fitted onto the sleeve (7), and the bushing (6) is connected to the body panel (1).

9. The hinge device for an electric double door according to claim 1, characterized in that, The body panel (1) includes a body panel mounting base plate (11), a hinge column (12), and a body panel connecting part (14). The hinge column (12) is disposed on the body panel mounting base plate (11), and the body panel connecting part (14) is disposed on the body panel mounting base plate (11) and connected to the hinge column (12). A reinforcing rib (13) is provided at the connection between the body panel connecting part (14) and the body panel mounting base plate (11).

10. The hinge device for an electric double door according to claim 1, characterized in that, The door panel (2) includes a door panel mounting base plate (21) and a hinge arm (22). One end of the hinge arm (22) is mounted on the door panel mounting base plate (21), and the other end of the hinge arm (22) is connected to the connecting bracket (4).

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