New energy vehicle chassis with variable wheel track torque and height

Abstract

The invention discloses a new energy vehicle chassis with variable wheel track torque and height, and relates to the technical field of new energy vehicle chassis. According to the new energy vehicle chassis with the variable wheel track torque and height, a positioning sliding plate and an adjusting frame can be driven to slide in the horizontal direction through operation of an adjusting cylinder body II, and then hubs and tires can be driven to horizontally move along with the positioning sliding plate and the adjusting frame, so that adjustment of a single set of wheel tracks is achieved; and meanwhile, the first adjusting cylinder body runs to drive the adjusting frame to slide in the vertical direction, the hub and the tire can be driven to slide up and down along with the positioning sliding plate and the adjusting frame, the height between the hub and the ground is adjusted, and the adjusting convenience and the using effect of the vehicle chassis are effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicle chassis, and specifically relates to a new energy vehicle chassis with variable wheelbase torque and height. Background Art

[0002] New energy vehicles refer to vehicles that use unconventional vehicle fuels as power sources or use conventional vehicle fuels and adopt new in-vehicle power devices, integrating advanced technologies in vehicle power control and drive, forming vehicles with advanced technical principles, new technologies, and new structures; the battery integrated chassis of new energy vehicles is mainly used to support and install the vehicle engine and various components and assemblies to form the overall shape of the vehicle, and receive the power of the engine to make the vehicle move and ensure the normal driving of the vehicle; referring to Chinese Patent, "A Battery Integrated Chassis for New Energy Vehicles" with the publication number: "CN117341455B", this patent points out that for the existing vehicle chassis, when the vehicle body is impacted by external forces and the chassis beam frame deforms, the deformed beam frame will directly squeeze the battery pack, which may lead to the spontaneous combustion or explosion of the battery pack; however, this device still has the problem of being inconvenient to adjust the vehicle chassis. For this reason, we propose a new energy vehicle chassis with variable wheelbase torque and height to solve the above problems. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the present invention provides a new energy vehicle chassis with variable wheelbase torque and height, which solves the problems raised in the above background art.

[0004] To achieve the above objectives, the present invention is realized through the following technical solutions: A new energy vehicle chassis with variable wheelbase torque and height, including a bottom base frame, in the middle of the inner side of the bottom base frame, a storage rack is installed, and the storage rack is used to store battery modules;

[0005] On both ends of the two sides of the bottom base frame, assembly frames are provided, and the assembly frames are used to assemble the hub support arms. Between each of the multiple assembly frames and the bottom base frame, an adjustment component is provided, which is used to adjust the position and height of the assembly frame;

[0006] The adjustment component includes an adjustment frame, the assembly frame is rotationally connected to the adjustment frame, the adjustment frame is slidably connected to the bottom base frame, on both sides of the bottom of the adjustment frame, outer sleeve rods are fixed, the limit rods are slidably installed inside the bottom base frame, inside the bottom base frame, a right-angle positioning plate is fixedly installed, and above the right-angle positioning plate, an adjustment cylinder two is fixedly installed. On the outside of the adjustment frame, a positioning sliding plate is fixedly installed, inside the positioning sliding plate, a connecting shaft rod is slidably connected, and the piston end of the adjustment cylinder two is fixedly connected to the end of the positioning sliding plate, which is used to drive the positioning sliding plate and the adjustment frame to slide horizontally;

[0007] A top driving frame is fixedly installed on the top of the bottom base frame. An adjusting cylinder I is fixedly installed inside the top driving frame. The piston end of the adjusting cylinder I is fixedly connected to the top of the adjusting frame, and is used to drive the adjusting frame to slide in the vertical direction.

[0008] Preferably, the outer sleeve rod is slidably connected to the inside of the bottom base frame. An inner sliding rod is slidably sleeved inside the outer sleeve rod. The inner sliding rod is used to expand and contract inside the outer sleeve rod when the adjusting frame slides in the vertical direction.

[0009] Preferably, an extension frame is fixedly installed on the outside of the bottom base frame. Sliding notches adapted to the inner sliding rod are respectively formed inside the extension frame and inside the bottom base frame. The inner sliding rod is kept in sliding connection with the sliding notches.

[0010] Preferably, an assembly shaft is installed at the end of the assembly frame. The assembly shaft is used for assembling the hub support arm.

[0011] Preferably, protective end frames are fixedly installed at both ends of the bottom base frame.

[0012] Preferably, a protective module is arranged outside the storage frame and is used for protecting the battery module stored inside the storage frame. The protective module includes a protective frame which is fixedly installed on the outside of the storage frame. A plurality of buffer springs I are fixedly installed between the protective frame and the inner wall of the bottom base frame and are used for buffering the force received by the storage frame.

[0013] Preferably, a plurality of bottom protective rods are rotatably connected to the bottom of the bottom base frame. The bottom protective rods are used for protecting the bottom of the bottom base frame.

[0014] Preferably, a limiting shaft rod is slidably connected between adjacent two of the bottom protective rods. A buffer spring II is sleeved outside the limiting shaft rod.

[0015] Preferably, rotating shafts are fixedly installed at the ends of the bottom protective rods. The rotating shafts are rotatably connected to the bottom base frame. Return springs are sleeved outside the rotating shafts and are used for driving the rotating shafts and the bottom protective rods to reset.

[0016] Preferably, a plurality of positioning end plates are fixedly installed on both sides of the bottom base frame. The rotating shafts are rotatably connected to the positioning end plates.

[0017] The present invention provides a new energy vehicle chassis with variable wheelbase torque and height. Compared with the prior art, the following beneficial effects are achieved:

[0018] (1) The chassis of the new energy vehicle with variable wheelbase, torque and height can drive the positioning slide plate and the adjusting frame to slide horizontally by the operation of cylinder two, and then can drive the wheel hub and the tire to translate along with the positioning slide plate and the adjusting frame, so as to realize the adjustment of a single group of wheelbase. At the same time, by the operation of cylinder one to drive the adjusting frame to slide vertically, it can drive the wheel hub and the tire to slide up and down along with the positioning slide plate and the adjusting frame, so as to realize the adjustment of the height between the wheel hub and the ground, effectively improving the adjustment convenience and the use effect of the vehicle chassis.

[0019] (2) The chassis of the new energy vehicle with variable wheelbase, torque and height is provided with a protective frame. When the vehicle is running, through the cooperation of multiple first buffer springs, the vibration force received by the storage rack can be buffered, further improving the protection effect on the battery module. At the same time, through the cooperation of the bottom protection rod, when the bottom of the bottom base frame is impacted, the bottom protection rod is stressed, squeezing the second buffer spring, thereby improving the protection effect on the bottom of the storage rack, and avoiding the phenomenon that the vehicle chassis is damaged or catches fire due to excessive impact force, improving the use safety of the battery module. Brief Description of the Drawings

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 For the present invention Figure 1 Top view structure schematic diagram;

[0022] Figure 3 It is a schematic diagram of the sectional structure of the bottom base frame of the present invention;

[0023] Figure 4 For the present invention Figure 2 Enlarged structure schematic diagram at A in;

[0024] Figure 5 For the present invention Figure 3 Side view structure schematic diagram;

[0025] Figure 6 For the present invention Figure 5 Enlarged structure schematic diagram at B in;

[0026] Figure 7 It is a schematic diagram of the structure of the adjusting frame and the top driving frame of the present invention;

[0027] Figure 8 It is a schematic diagram of the structure of the adjusting frame and the assembly frame of the present invention.

[0028] In the figure: 1. Bottom base frame; 101. Right-angle positioning plate; 2. Protective end frame; 3. Storage rack; 4. Protective rack; 401. First buffer spring; 5. Bottom protective rod; 501. Limit shaft rod; 502. Second buffer spring; 6. Rotating shaft; 601. Reset spring; 7. Positioning end plate; 8. Assembly rack; 801. Assembly shaft; 9. Top drive rack; 901. First adjusting cylinder body; 10. Second adjusting cylinder body; 11. Extension rack; 12. Adjusting rack; 1201. Limit rod; 1202. Outer sleeve rod; 1203. Inner sliding rod; 13. Positioning sliding plate; 1301. Connecting shaft rod. Detailed implementation mode

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] Please refer to Figures 1 - 8 , the present invention provides two technical solutions, specifically including the following embodiments:

[0031] Embodiment 1:

[0032] In the embodiment of the present invention, a new energy vehicle chassis with variable wheelbase torque and height includes a bottom base frame 1. A storage rack 3 is installed in the middle of the inner side of the bottom base frame 1. The storage rack 3 is used to store battery modules. The battery modules are existing new energy fuel cells and will not be elaborated here;

[0033] In the embodiment of the present invention, specifically, assembly racks 8 are provided at both end parts on both sides of the bottom base frame 1. The assembly racks 8 are used for assembling hub support arms. Adjusting components are provided between the multiple assembly racks 8 and the bottom base frame 1 to adjust the position and height of the assembly racks 8;

[0034] In the embodiment of the present invention, specifically, the hub support arm is used for assembling the hub and the tire. After the assembly is completed, it is connected to the hub support arm and the vehicle body through shock-absorbing springs to ensure the shock-absorbing effect during the operation of the vehicle;

[0035] In the embodiment of the present invention, specifically, the hub support arm is an existing structure and will not be elaborated here;

[0036] In an embodiment of the present invention, specifically, the adjusting assembly includes an adjusting frame 12, which is rotationally connected to the assembly frame 8 and slidably connected to the bottom base frame 1. Outer sleeve rods 1202 are fixed on both sides of the bottom of the adjusting frame 12. A limiting rod 1201 is slidably installed inside the bottom base frame 1. A right-angle positioning plate 101 is fixedly installed inside the bottom base frame 1, and an adjusting cylinder two 10 is fixedly installed above the right-angle positioning plate 101. A positioning sliding plate 13 is fixedly installed on the outer side of the adjusting frame 12. A connecting shaft rod 1301 is slidably connected inside the positioning sliding plate 13. The piston end of the adjusting cylinder two 10 is fixedly connected to the end of the positioning sliding plate 13, and is used to drive the positioning sliding plate 13 and the adjusting frame 12 to slide horizontally;

[0037] In an embodiment of the present invention, specifically, the operation of the adjusting cylinder two 10 can drive the positioning sliding plate 13 and the adjusting frame 12 to slide horizontally, and further drive the hub and the tire to translate along with the positioning sliding plate 13 and the adjusting frame 12, so as to realize the adjustment of the single wheelbase;

[0038] In an embodiment of the present invention, specifically, a top driving frame 9 is fixedly installed on the top of the bottom base frame 1. An adjusting cylinder one 901 is fixedly installed inside the top driving frame 9. The piston end of the adjusting cylinder one 901 is fixedly connected to the top of the adjusting frame 12, and is used to drive the adjusting frame 12 to slide vertically;

[0039] In an embodiment of the present invention, specifically, the operation of the adjusting cylinder one 901 drives the adjusting frame 12 to slide vertically, and can drive the hub and the tire to slide up and down along with the positioning sliding plate 13 and the adjusting frame 12, so as to realize the adjustment of the height between the hub and the ground;

[0040] In an embodiment of the present invention, specifically, through the cooperation between the positioning sliding plate 13 and the connecting shaft rod 1301, when the adjusting cylinder one 901 operates to drive the adjusting frame 12 to slide vertically, at this time, the connecting shaft rod 1301 can be stressed and slide inside the corresponding positioning sliding plate 13 to ensure the transmission effect;

[0041] In an embodiment of the present invention, specifically, the outer sleeve rod 1202 is slidably connected to the inside of the bottom base frame 1. An inner sliding rod 1203 is slidably sleeved inside the outer sleeve rod 1202. The inner sliding rod 1203 is used to stretch inside the outer sleeve rod 1202 when the adjusting frame 12 slides vertically. Through the sliding connection between the outer sleeve rod 1202 and the inner sliding rod 1203, the adjustment stability of the hub can be ensured;

[0042] In the embodiment of the present invention, specifically, an extension frame 11 is fixedly installed on the outer side of the bottom base frame 1. Sliding notches adapted to the inner sliding rod 1203 are provided inside the extension frame 11 and inside the bottom base frame 1. The inner sliding rod 1203 is slidably connected to the sliding notches. With the cooperation of the extension frame 11, the supporting effect on the inner sliding rod 1203 can be further improved, ensuring the load-bearing effect of the bottom base frame 1 after the wheelbase adjustment is completed;

[0043] In the embodiment of the present invention, specifically, an assembly shaft 801 is installed at the end of the assembly frame 8. The assembly shaft 801 is used for assembling the hub support arm;

[0044] In the embodiment of the present invention, specifically, protective end frames 2 are fixedly installed at both ends of the bottom base frame 1. The protective end frames 2 are made of existing aluminum alloy materials and are fixed to both ends of the bottom base frame 1 by bolts, and are used for energy absorption during collisions;

[0045] In the embodiment of the present invention, specifically, the torque can be achieved by adjusting the voltage of the motor or controlling with a frequency converter, which will not be elaborated here.

[0046] Embodiment 2: Based on Embodiment 1, in the embodiment of the present invention, a new energy vehicle chassis with variable wheelbase torque and height includes a bottom base frame 1. A storage rack 3 is installed in the middle of the inner side of the bottom base frame 1. The storage rack 3 is used for storing battery modules. The battery modules are existing new energy dye batteries, which will not be elaborated here;

[0047] In the embodiment of the present invention, specifically, assembly frames 8 are provided at both end parts on both sides of the bottom base frame 1. The assembly frames 8 are used for assembling the hub support arms. Adjusting components are provided between multiple assembly frames 8 and the bottom base frame 1 for adjusting the position and height of the assembly frames 8;

[0048] In the embodiment of the present invention, specifically, the hub support arm is used for assembling the hub and the tire. After the assembly is completed, it is connected to the hub support arm and the vehicle body through a shock-absorbing spring to ensure the shock-absorbing effect during the vehicle operation;

[0049] In the embodiment of the present invention, specifically, the hub support arm is of an existing structure, which will not be elaborated here;

[0050] In an embodiment of the present invention, specifically, the adjustment assembly includes an adjustment frame 12, which is rotatably connected to the assembly frame 8 and slidably connected to the bottom base frame 1. On both sides of the bottom of the adjustment frame 12, outer sleeve rods 1202 are fixedly installed. The limit rods 1201 are slidably installed inside the bottom base frame 1. Inside the bottom base frame 1, a right-angle positioning plate 101 is fixedly installed, and an adjustment cylinder two 10 is fixedly installed above the right-angle positioning plate 101. A positioning slide plate 13 is fixedly installed on the outside of the adjustment frame 12. Inside the positioning slide plate 13, an engagement shaft rod 1301 is slidably connected. The piston end of the adjustment cylinder two 10 is fixedly connected to the end of the positioning slide plate 13, which is used to drive the positioning slide plate 13 and the adjustment frame 12 to slide horizontally;

[0051] In an embodiment of the present invention, specifically, when the adjustment cylinder two 10 operates, it can drive the positioning slide plate 13 and the adjustment frame 12 to slide horizontally, and then drive the hub and the tire to translate along with the positioning slide plate 13 and the adjustment frame 12, so as to realize the adjustment of the single-wheel track;

[0052] In an embodiment of the present invention, specifically, a top drive frame 9 is fixedly installed on the top of the bottom base frame 1. Inside the top drive frame 9, an adjustment cylinder one 901 is fixedly installed. The piston end of the adjustment cylinder one 901 is fixedly connected to the top of the adjustment frame 12, which is used to drive the adjustment frame 12 to slide vertically;

[0053] In an embodiment of the present invention, specifically, when the adjustment cylinder one 901 operates to drive the adjustment frame 12 to slide vertically, it can drive the hub and the tire to slide up and down along with the positioning slide plate 13 and the adjustment frame 12, so as to realize the adjustment of the height between the hub and the ground;

[0054] In an embodiment of the present invention, specifically, through the cooperation between the positioning slide plate 13 and the engagement shaft rod 1301, when the adjustment cylinder one 901 operates to drive the adjustment frame 12 to slide vertically, at this time, the engagement shaft rod 1301 can be stressed and slide inside the corresponding positioning slide plate 13 to ensure the transmission effect;

[0055] In an embodiment of the present invention, specifically, the outer sleeve rod 1202 is slidably connected to the inside of the bottom base frame 1. An inner slide rod 1203 is slidably sleeved inside the outer sleeve rod 1202. The inner slide rod 1203 is used to stretch inside the outer sleeve rod 1202 when the adjustment frame 12 slides vertically. Through the sliding connection between the outer sleeve rod 1202 and the inner slide rod 1203, the adjustment stability of the hub can be ensured;

[0056] In an embodiment of the present invention, specifically, an extension frame 11 is fixedly installed on the outer side of the bottom base frame 1. Sliding notches adapted to the inner sliding rod 1203 are provided inside the extension frame 11 and inside the bottom base frame 1. The inner sliding rod 1203 is slidably connected to the sliding notches. Through the cooperation of the extension frame 11, the supporting effect on the inner sliding rod 1203 can be further improved, and the load-bearing effect of the bottom base frame 1 after the wheelbase adjustment can be ensured;

[0057] In an embodiment of the present invention, specifically, an assembly shaft 801 is installed at the end of the assembly frame 8. The assembly shaft 801 is used for assembling the hub support arm;

[0058] In an embodiment of the present invention, specifically, protective end frames 2 are fixedly installed at both ends of the bottom base frame 1. The protective end frames 2 are made of existing aluminum alloy materials and are fixed to both ends of the bottom base frame 1 by bolts, and are used for energy absorption during collisions;

[0059] In an embodiment of the present invention, further, a protection module is provided outside the storage frame 3 for protecting the battery module stored inside the storage frame 3. The protection module includes a protection frame 4. The protection frame 4 is fixedly installed on the outer side of the storage frame 3. A plurality of first buffer springs 401 are fixedly installed between the protection frame 4 and the inner wall of the bottom base frame 1 for buffering the force received by the storage frame 3;

[0060] In an embodiment of the present invention, specifically, through the arrangement of the protection frame 4, when the vehicle is running, through the cooperation of a plurality of first buffer springs 401, the vibration force received by the storage frame 3 can be buffered, and the protection effect on the battery module can be further improved;

[0061] In an embodiment of the present invention, specifically, a plurality of bottom protection rods 5 are rotatably connected to the bottom of the bottom base frame 1. The bottom protection rods 5 are used for protecting the bottom of the bottom base frame 1;

[0062] In an embodiment of the present invention, specifically, a limiting shaft rod 501 is slidably connected between two adjacent bottom protection rods 5. A second buffer spring 502 is sleeved on the outer side of the limiting shaft rod 501;

[0063] In an embodiment of the present invention, specifically, through the cooperation of the bottom protection rods 5, when an impact occurs at the bottom of the bottom base frame 1, the bottom protection rods 5 are stressed, and the second buffer spring 502 is compressed, thereby improving the protection effect on the bottom of the storage frame 3, avoiding the phenomenon that the impact force on the vehicle chassis is too large, resulting in failures and fires, and improving the use safety of the battery module;

[0064] In the embodiment of the present invention, specifically, rotating shafts 6 are fixedly installed at the ends of the bottom protection bars 5, and the rotating shafts 6 are rotatably connected to the bottom base frame 1. Return springs 601 are sleeved on the outer sides of the rotating shafts 6 and are used to drive the rotating shafts 6 and the bottom protection bars 5 to return to their original positions.

[0065] In the embodiment of the present invention, specifically, a plurality of positioning end plates 7 are fixedly installed on both sides of the bottom base frame 1, and the rotating shafts 6 are rotatably connected to the positioning end plates 7.

[0066] Meanwhile, the content not described in detail in this specification belongs to the prior art well known to those skilled in the art.

[0067] The above has described in detail one embodiment of the present invention, but the described content is only a preferred embodiment of the present invention and cannot be considered as limiting the scope of implementation of the present invention. Any equivalent changes and improvements made according to the scope of the application of the present invention should still fall within the scope covered by the present invention.

Claims

1. A new energy vehicle chassis with variable wheelbase torque and height, comprising a bottom frame (1), characterized in that: A storage rack (3) is installed in the middle of the inner side of the bottom base frame (1), and the storage rack (3) is used to store battery modules; Both side ends of the bottom base frame (1) are provided with assembly frames (8), the assembly frames (8) are used to assemble the hub support arms, and adjustment components are provided between the plurality of assembly frames (8) and the bottom base frame (1) for adjusting the position and height of the assembly frames (8); The adjustment component comprises an adjustment frame (12), the assembly frame (8) and the adjustment frame (12) are rotatably connected, and the adjustment frame (12) and the bottom base frame (1) are slidably connected, outer sleeve rods (1202) are fixed on both sides of the bottom of the adjustment frame (12), the limit rod (1201) is slidably installed inside the bottom base frame (1), a right-angle positioning plate (101) is fixedly installed inside the bottom base frame (1), and an adjustment cylinder body 2 (10) is fixedly installed above the right-angle positioning plate (101), a positioning slide plate (13) is fixedly installed on the outer side of the adjustment frame (12), and a connecting shaft rod (1301) is slidably connected inside the positioning slide plate (13), and a piston end of the adjustment cylinder body 2 (10) is fixedly connected to the end of the positioning slide plate (13) for driving the positioning slide plate (13) and the adjustment frame (12) to slide in the horizontal direction; A top driving frame (9) is fixedly mounted on the top of the bottom base frame (1), an adjusting cylinder body (901) is fixedly mounted inside the top driving frame (9), and a piston end of the adjusting cylinder body (901) is fixedly connected to the top of the adjusting frame (12) for driving the adjusting frame (12) to slide in a vertical direction.

2. A new energy vehicle chassis with variable wheelbase torque and height according to claim 1, characterized in that: The outer rod (1202) is slidably connected to the inside of the bottom base frame (1), and the inner sliding rod (1203) is slidably sleeved inside the outer rod (1202). The inner sliding rod (1203) is used to extend and retract inside the outer rod (1202) when the adjustment frame (12) slides in the vertical direction.

3. A new energy vehicle chassis with variable wheelbase torque and height according to claim 2, characterized in that: An extension frame (11) is fixedly mounted on the outer side of the bottom base frame (1), and a sliding slot matching the inner sliding rod (1203) is provided inside the extension frame (11) and inside the bottom base frame (1), and the inner sliding rod (1203) maintains a sliding connection with the sliding slot.

4. The new energy vehicle chassis with variable wheelbase torque and height according to claim 1, characterized in that: An assembly shaft (801) is installed at the end of the assembly frame (8), and the assembly shaft (801) is used to assemble the wheel hub support arm.

5. The new energy vehicle chassis with variable wheelbase torque and height according to claim 1, characterized in that: Protective end frames (2) are fixedly mounted on both ends of the bottom base frame (1).

6. The new energy vehicle chassis with variable wheelbase torque and height according to claim 1, characterized in that: A protective module is provided on the outside of the storage rack (3) for protecting the battery modules stored inside the storage rack (3); the protective module comprises a protective rack (4) which is fixedly mounted on the outside of the storage rack (3); a plurality of buffer springs (401) are fixedly mounted between the protective rack (4) and the inner wall of the bottom base frame (1) for buffering the force applied to the storage rack (3).

7. The new energy vehicle chassis with variable wheelbase torque and height according to claim 1, characterized in that: The bottom of the bottom base frame (1) is rotatably connected to a plurality of bottom protection rods (5), and the bottom protection rods (5) are used to protect the bottom of the bottom base frame (1).

8. The new energy vehicle chassis with variable wheelbase torque and height according to claim 7, characterized in that: Two adjacent bottom protection rods (5) are slidably connected with a limiting shaft rod (501), and a second buffer spring (502) is sleeved on the outer side of the limiting shaft rod (501).

9. The new energy vehicle chassis with variable wheelbase torque and height according to claim 7, characterized in that: The ends of the bottom protection rods (5) are fixedly mounted with rotating shafts (6), the rotating shafts (6) are rotatably connected to the bottom base frame (1), and the outer sides of the rotating shafts (6) are sleeved with reset springs (601) for driving the rotating shafts (6) and the bottom protection rods (5) to reset.

10. The new energy vehicle chassis with variable wheelbase torque and height according to claim 9, characterized in that: A plurality of positioning end plates (7) are fixedly mounted on both sides of the bottom base frame (1), and the rotating shaft (6) is rotatably connected to the positioning end plates (7).

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