A vehicle safety driving assistance device that can be quickly assembled

Abstract

The present invention relates to the technical field of assembly of vehicle safety driving assistance equipment, and in particular to a vehicle safety driving assistance equipment that can be assembled quickly, comprising a safety driving assistance equipment and an expandable assembly structure, wherein the front end of the safety driving assistance equipment is fixedly connected with a plug-in port, the bottom end of the safety driving assistance equipment is fixedly connected with a base plate, and a snap-fit ​​assembly structure is provided around the bottom end of the base plate, wherein the snap-fit ​​assembly structure comprises a connecting column, wherein the connecting column is fitted with the base plate, and the top end of the connecting column is internally bolted with a bolt, wherein the bolt passes through the base plate, and the bolt is rotatably connected to the base plate. In the present invention, by providing a universal positioning ball, a bolt, a splint and a threaded shaft, the universal positioning ball and the splint are engaged with each other, so that the safety driving assistance equipment can be quickly assembled, and the assembly is very stable, thereby solving the problem of slippage of the assembly screws of the safety driving assistance equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle safe driving assistance equipment assembly, and in particular to a vehicle safe driving assistance equipment that can be assembled quickly. Background Art

[0002] The vehicle safety driving assistance equipment is a new generation of intelligent devices that integrate active safety, fatigue monitoring, and 4G video. A single device can achieve real-time and comprehensive monitoring and tracking of driver and passenger status, road information, vehicle operating conditions, vehicle loading, and cargo conditions, avoiding fatigue driving and speeding, and ensuring driving safety to the greatest extent. It adopts a highly integrated PCBA board design and uses the latest hardware platform to greatly simplify the internal structure of the host. It can avoid the problems of heat dissipation, assembly, product integration, and after-sales service brought by the DVR motherboard + algorithm motherboard solution, and also reduces the equipment instability caused by the multi-board design.

[0003] During vehicle production, safety driving assistance equipment will be installed in the vehicle to provide auxiliary functions for vehicle driving. At the same time, vehicle safety driving assistance equipment is also necessary equipment to reduce vehicle accidents. The installation of vehicle driving assistance equipment generally uses screws to tighten and fix. This fixing method is not only very slow to assemble, but also prone to screw stripping and slipping during assembly, resulting in unstable assembly, very loose connection and plugging of lines, and messy placement of lines, which is not conducive to line organization. The connection end is easily torn off by external force, and the interface end added for data entry is generally set at the rear end of the safety driving assistance equipment, which needs to be removed for data entry operations, and is less convenient to use. Summary of the Invention

[0004] The object of the present invention is to provide a vehicle safety driving assistance device that can be quickly assembled to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A vehicle safety driving assistance device that can be quickly assembled includes a safety driving assistance device and an expandable assembly structure, wherein the front end of the safety driving assistance device is fixedly connected to a plug-in port, the bottom end of the safety driving assistance device is fixedly connected to a base plate, and a snap-fit ​​assembly structure is provided around the bottom end of the base plate, and the snap-fit ​​assembly structure includes a connecting column, the connecting column is fitted with the base plate, the top end of the connecting column is internally bolted with a bolt, the bolt passes through the base plate, and the bolt is rotatably connected to the base plate, the bottom end of the connecting column is fixedly connected to a universal positioning ball, and the universal positioning ball is fixedly connected to the base plate. A splint is engaged with the outside of the positioning ball, and a block is fixedly connected to the inner wall of the splint, and the block is engaged with the universal positioning ball, the bottom end of the splint is fixedly connected to a threaded shaft, and the top end of the threaded shaft is fixedly connected to a swivel head, and a wire clamping structure is provided on the right side of the top of the safety driving assistance device, and the wire clamping structure includes a connecting plate, and the connecting plate is fixedly connected to the safety driving assistance device, and an external data transmission structure is provided on the left side of the top of the safety driving assistance device, and the external data transmission structure includes a storage box, and the storage box is fixedly connected to the safety driving assistance device.

[0007] Preferably, the top end of the connecting plate is fixedly connected with a protruding block, the left side of the middle position of the top end of the connecting plate is rotatably connected to the clamping shaft, the right side of the middle position of the top end of the connecting plate is fixedly connected with a baffle, a limiting hole is provided at the center position of the baffle, and an insert rod is slidably connected inside the limiting hole of the baffle, the insert rod passes through the clamping shaft, and the insert rod is slidably connected to the clamping shaft, the other end of the insert rod is fixedly connected to a spring, and the other end of the spring is fixedly connected to the clamping shaft, the top end of the pull block is fixedly connected with a pull block, and the pull block is slidably connected to the clamping shaft.

[0008] The protruding blocks are symmetrically arranged at the top ends of the connecting plates, and the pressing shafts are located in the internal gaps of the protruding blocks.

[0009] The clamping shaft is provided with a transmission rod, the rotating shaft of the transmission rod is rotatably connected to the clamping shaft, a torsion spring is sleeved on the outer side of the rotating shaft of the transmission rod, and the torsion spring is fixedly connected to the clamping shaft, and the right end of the transmission rod is fixedly connected to the compression rod.

[0010] The inner rear side of the storage box is rotatably connected to a data line converter, the top of the data line converter is fixedly connected to a closing block, and the top front side of the storage box is fixedly connected to a limiting block.

[0011] The rear end of the data line converter is fixedly connected to a support foot, the bottom end of the support foot is fixedly connected to a magnetic plate, and the magnetic plate is fitted with the safe driving assistance device.

[0012] The expandable assembly structure includes a rotating rod, which passes through the base plate and is rotatably connected to the base plate. A stabilizing ring is sleeved on the outer side of the rotating rod, and the stabilizing ring is attracted to the installation area. A clamping plate is rotatably connected to the outer side of the stabilizing ring. The bottom end of the clamping plate is rotatably connected to a transmission shaft. The other end of the transmission shaft is rotatably connected to a nut, and the nut is spirally connected to the thread of the rotating rod.

[0013] An annular groove is provided at the top of the stabilizing ring, and a magnetic ring is embedded in the annular groove at the top of the stabilizing ring;

[0014] The Internet of Vehicles is connected to a safe driving assistance device in the vehicle. The safe driving assistance device performs vehicle assistance and safe driving through vehicle-road interaction of the Internet of Vehicles, and information exchange is performed by the safe driving assistance device.

[0015] The safe driving assistance equipment strictly abides by the Internet of Vehicles management and service regulations. The management platform issues tasks to the transportation organization through the safe driving assistance equipment. The transportation organization dispatches travel services to individual drivers, and finally obtains a service evaluation, which is entered into the Internet of Vehicles intelligence for information retention.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. In the present invention, by providing a universal positioning ball, a bolt, a clamping plate and a threaded shaft, the universal positioning ball and the clamping plate engage with each other, so that the safe driving assistance device can be assembled quickly and stably, solving the problem of screw slippage in the assembly of the safe driving assistance device;

[0018] 2. In the present invention, by providing the raised blocks, the pressing shaft, the baffle and the pressing rod, the data line is placed between the two raised blocks, the pressing shaft is rotated for positioning, and the data line is pressed by the pressing rod to improve the positioning stability. The line is very neatly arranged, which is conducive to the arrangement of the data line and prevents the connection end from being torn off by external forces.

[0019] 3. In the present invention, by providing a storage box, a data line converter, a limit block and a support foot, the data line converter can be directly opened for connection to perform data entry operations on the safe driving assistance device. It is very simple to use and does not require disassembly operations, which is very convenient.

[0020] 4. In the present invention, by providing a rotating rod, a nut, a clamping plate and a magnetic ring, the rotating rod pushes the clamping plate through the nut to open the safe driving assistance device for rapid assembly, avoiding the risk of thread slippage while ensuring very stable assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the installation structure of the universal positioning ball of the present invention;

[0023] Figure 3 This is a schematic diagram of the installation structure of the card block of the present invention;

[0024] Figure 4 Schematic diagram of the installation structure of the spring of the present invention;

[0025] Figure 5 This is a schematic diagram of the installation structure of the data line converter of the present invention;

[0026] Figure 6 This is a schematic diagram of the installation structure of the expandable assembly structure of the present invention;

[0027] Figure 7 Schematic diagram of the installation structure of the pressing plate of the present invention;

[0028] Figure 8 This is an interactive diagram of the vehicle network intelligent safety driving assistance device of the present invention.

[0029] In the figure: 1-safe driving assistance equipment, 2-plug port, 3-bottom plate, 4-clamping assembly structure, 401-connecting column, 402-bolt, 403-universal positioning ball, 404-clamping plate, 405-block, 406-rotating head, 407-threaded shaft, 5-plug-in clamping structure, 501-connecting plate, 502-protruding block, 503-pressing shaft, 504-baffle, 505-plug rod, 506-spring, 50 7-Pull block, 508-Transmission rod, 509-Torsion spring, 510-Pressure rod, 6-External data transmission structure, 601-Storage box, 602-Data line converter, 603-Closing block, 604-Limiting block, 605-Support foot, 606-Magnetic plate, 7-Extended assembly structure, 701-Rotating rod, 702-Pressure plate, 703-Transmission shaft, 704-Nut, 705-Stabilizing ring, 706-Magnetic ring. DETAILED DESCRIPTION

[0030] Example 1:

[0031] See also Figure 1-6 , the present invention provides a technical solution:

[0032] A vehicle safety driving assistance device that can be quickly assembled includes a safety driving assistance device 1 and an extended assembly structure 7. The front end of the safety driving assistance device 1 is fixedly connected to a plug-in port 2, and the bottom end of the safety driving assistance device 1 is fixedly connected to a base plate 3. The bottom end of the base plate 3 is surrounded by a snap-fit ​​assembly structure 4. The snap-fit ​​assembly structure 4 includes a connecting column 401, which is in contact with the base plate 3. The top of the connecting column 401 is internally bolted with a bolt 402. The bolt 402 is fixedly connected to the base plate 3. 2 passes through the bottom plate 3, and the bolt 402 is rotatably connected to the bottom plate 3. The bottom end of the connecting column 401 is fixedly connected to a universal positioning ball 403. The outside of the universal positioning ball 403 is engaged with a clamping plate 404. The inner wall of the clamping plate 404 is fixedly connected to a clamping block 405, and the clamping block 405 is engaged with the universal positioning ball 403. The bottom end of the clamping plate 404 is fixedly connected to a threaded shaft 407. The top end of the threaded shaft 407 is fixedly connected to a rotating head 406. The clamping plate 404 is quickly installed through the threaded shaft 407. 401 is fixedly connected to the safety driving assistance device 1, and the wire clamping structure 5 is provided on the top right side of the safety driving assistance device 1, and the wire clamping structure 5 includes a connecting plate 501, and the connecting plate 501 is fixedly connected to the safety driving assistance device 1, and the external data transmission structure 6 is provided on the top left side of the safety driving assistance device 1, and the external data transmission structure 6 includes a storage box 601, and the storage box 601 is fixedly connected to the safety driving assistance device 1, and the wire clamping structure 5 cooperates with the structure on the connecting plate 501 to clamp the data line to prevent it from being placed in a disorderly manner.

[0033] Example 2:

[0034] The top of the connecting plate 501 is fixedly connected with a raised block 502, and the left middle position of the top of the connecting plate 501 is rotatably connected to a clamping shaft 503, and the right middle position of the top of the connecting plate 501 is fixedly connected with a baffle 504, and a limiting hole is provided at the center of the baffle 504, and an insert rod 505 is slidably connected inside the limiting hole of the baffle 504, and the insert rod 505 passes through the clamping shaft 503, and the insert rod 505 is slidably connected to the clamping shaft 503, and the other end of the insert rod 505 is fixedly connected to a spring 506, and the other end of the spring 506 is fixed to the clamping shaft 503 The top of the pull block 507 is fixedly connected with a pull block 507, and the pull block 507 is slidably connected to the clamping shaft 503. The raised blocks 502 on both sides of the connecting plate 501 form a positioning gap. After the data line is inserted, the clamping shaft 503 is rotated to enter the positioning gap to tighten and prevent misalignment. The spring 506 inside the right side of the clamping shaft 503 can directly bounce the insertion rod 505 into the limiting hole of the baffle 504 for positioning. By pulling the pull block 507, the compression spring 506 of the insertion rod 505 is compressed and deformed to open the insertion rod 505. The operation is relatively simple.

[0035] Example 3:

[0036] The raised blocks 502 are symmetrically arranged at the top of the connecting plate 501, and the pressing shaft 503 is located in the internal gap of the raised blocks 502. The raised blocks 502 on both sides support the data line, and are very stable in the gap to prevent random displacement.

[0037] Example 4:

[0038] The clamping shaft 503 is provided with a transmission rod 508, the rotating shaft of the transmission rod 508 is rotatably connected to the clamping shaft 503, the outer side of the rotating shaft of the transmission rod 508 is sleeved with a torsion spring 509, and the torsion spring 509 is fixedly connected to the clamping shaft 503, and the right end of the transmission rod 508 is fixedly connected to a pressure rod 510. The transmission rod 508 is connected to the clamping shaft 503 through the rotating shaft. The torsion spring 509 sleeved on the outer side of the transmission rod 508 can drive the pressure rod 510 on the other side to press on another part of the data cable, thereby performing a very stable compression method at both ends.

[0039] Example 5:

[0040] The rear side of the storage box 601 is rotatably connected to the data line converter 602, the top of the data line converter 602 is fixedly connected to the closing block 603, and the top front side of the storage box 601 is fixedly connected to the limiting block 604. The data line converter 602 is positioned by snapping the closing block 603 into the outside of the limiting block 604. The opening or closing operation of the data line converter 602 is very simple.

[0041] Example 6:

[0042] The rear end of the data cable converter 602 is fixedly connected to a support leg 605, and the bottom end of the support leg 605 is fixedly connected to a magnetic plate 606, and the magnetic plate 606 is in contact with the safe driving assistance device 1. After the data cable converter 602 is opened, the support leg 605 at the rear end of the data cable converter 602 is close to the top side of the safe driving assistance device 1, and the magnetic plate 606 at the bottom end of the support leg 605 is adsorbed and positioned to maintain the open state and prevent accidental closure;

[0043] Working process: The electrical appliance of this device is an external power supply. The staff inserts the splint 404 in the snap-fit ​​assembly structure 4 into the pre-drilled positioning hole through the threaded shaft 407 for installation, rotates the turntable 406 to tighten the threaded shaft 407 inside the positioning hole to complete the installation of the splint 404. After installation, fit the connecting column 401 to the through hole of the bottom plate 3 of the safe driving assistance device 1, remove the bolt 402, insert it into the through hole, position the connecting column 401, repeat the above operation, and assemble the other three universal positioning balls 403 under the through holes around the bottom end of the bottom plate 3. When assembling the safe driving assistance device 1, directly align the universal positioning balls 403 around the bottom plate 3 of the safe driving assistance device 1 with the gaps in the splint 404 and press them in. The splint 404 The universal positioning ball 403 is clamped and positioned, and the block 405 on the inner wall of the splint 404 is inserted into the limiting hole with the universal positioning ball 403 for assembly. The quick assembly operation is very simple and fast. After the assembly of the safe driving assistance device 1 is completed, the staff will take out the data cable to be connected, and put the data cable into the gap between the raised block 502 on the connecting plate 501 in the plug-in clamping structure 5, rotate the clamping shaft 503, and clamp the data cable. The spring 506 on the right side of the clamping shaft 503 pushes the plug rod 505 to pop out quickly, positioning the plug rod 505 in the positioning hole of the baffle 504 to maintain the stability of the data cable positioning. At the same time, the torsion spring 509 on the left side of the clamping shaft 503 drives the transmission rod 508 to start rotating, and the pressure rod 5 10 Rotate and tighten the other side of the data line to limit the two positions of the data line, which makes the data line very neat. Insert the connecting end of the data line into the plug-in port 2 and the connection is very stable. When external force is applied, the clamping shaft 503 cooperates with the pressure rod 510 to perform stable clamping and positioning. When a safety system needs to be added after a period of use, the staff unplugs the closing block 603 in the external data transmission structure 6 from the outside of the limit block 604, rotates the data line converter 602 to open it from the inside of the storage box 601, and the support leg 605 at the rear end of the data line converter 602 is adsorbed and positioned on the surface of the safe driving assistance device 1 through the magnetic plate 606. Use the connector to connect the data line converter 602 to perform data entry operations. Data entry operations can be performed without disassembling the safe driving assistance device 1, which is very convenient to use. The safe driving assistance device 1 will constantly remind the auxiliary driver to plan the route and issue warnings of route hazards while the vehicle is driving, thereby reducing the possibility of accidents. The Internet of Vehicles connects to the safe driving assistance device 1 in the vehicle. The safe driving assistance device 1 performs vehicle assistance and safe driving through the vehicle-road interaction of the Internet of Vehicles. The safe driving assistance device 1 performs information exchange. The safe driving assistance device 1 strictly abides by the Internet of Vehicles management and service regulations. The management platform sends tasks to the transportation organization through the safe driving assistance device 1. The transportation organization dispatches travel services to individual drivers, and finally draws a service evaluation, which enters the Internet of Vehicles intelligence for information retention.

[0044] Example 7:

[0045] See also Figure 6 、 Figure 7 , the present invention provides a technical solution:

[0046] The expandable assembly structure 7 includes a rotating rod 701, which passes through the base plate 3 and is rotatably connected to the base plate 3. A stabilizing ring 705 is sleeved on the outer side of the rotating rod 701, and the stabilizing ring 705 is attracted to the installation area. The outer side of the stabilizing ring 705 is rotatably connected to the clamping plate 702, and the bottom end of the clamping plate 702 is rotatably connected to the transmission shaft 703. The other end of the transmission shaft 703 is rotatably connected to a nut 704, and the nut 704 is spirally connected to the thread of the rotating rod 701. The rotating rod 701 is inserted into the through holes around the base plate 3, and then the rotating rod 701 is inserted into the positioning hole for assembly. The rotating rod 701 rotates to control the nut 704 to rotate and lift, thereby controlling the external rotatably connected transmission shaft 703 to expand, pushing the clamping plate 702 open, positioning it on the car, and quickly assembling.

[0047] Example 8:

[0048] The top of the stabilizing ring 705 is provided with an annular groove, and a magnetic ring 706 is embedded in the annular groove at the top of the stabilizing ring 705. The magnetic ring 706 embedded in the annular groove at the top of the stabilizing ring 705 is adsorbed on the car to stabilize the pressing plate 702.

[0049] Workflow: In Example 8, the parts that are the same as those in Example 6 are no longer repeated. The difference is that the expandable assembly structure 7 is installed into the through holes around the base plate 3, and the rotating rod 701 on the base plate 3 of the safe driving assistance device 1 is inserted into the positioning hole of the vehicle. The magnetic ring 706 embedded in the top of the stabilizing ring 705 sleeved on the outside of the rotating rod 701 is adsorbed and positioned to the inner wall of the car. Use a tool to rotate the rotating rod 701. During the rotation of the rotating rod 701, the outer nut 704 spirally rotates and rises, pushing the transmission shaft 703 to push the clamping plate 702 to expand and open, and fit to the inner wall of the car for clamping and limiting, completing the quick assembly.

[0050] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method of the present invention and its core ideas. The above are only preferred implementation methods of the present invention. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of the present invention, they can make several improvements, modifications or changes, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the scope of protection of the present invention.

Claims

1. A vehicle safety driving assistance device that can be quickly assembled, comprising a safety driving assistance device (1) and an expandable assembly structure (7), characterized in that: The front end of the safe driving assistance device (1) is fixedly connected to a plug-in port (2), the bottom end of the safe driving assistance device (1) is fixedly connected to a base plate (3), and a snap-fit ​​assembly structure (4) is provided around the bottom end of the base plate (3), and the snap-fit ​​assembly structure (4) includes a connecting column (401), the connecting column (401) is fitted with the base plate (3), the top end of the connecting column (401) is internally bolted with a bolt (402), the bolt (402) passes through the base plate (3), and the bolt (402) is rotatably connected to the base plate (3), the bottom end of the connecting column (401) is fixedly connected to a universal positioning ball (403), the outside of the universal positioning ball (403) is snap-fitted with a clamping plate (404), and the clamping plate (404) The inner wall of the safety driving assistance device (1) is fixedly connected with a card block (405), and the card block (405) is engaged with the universal positioning ball (403), the bottom end of the clamping plate (404) is fixedly connected with a threaded shaft (407), and the top end of the threaded shaft (407) is fixedly connected with a rotating head (406), the top right side of the safety driving assistance device (1) is provided with a plug-in clamping structure (5), the plug-in clamping structure (5) includes a connecting plate (501), and the connecting plate (501) is fixedly connected to the safety driving assistance device (1), the top left side of the safety driving assistance device (1) is provided with an external data transmission structure (6), the external data transmission structure (6) includes a storage box (601), and the storage box (601) is fixedly connected to the safety driving assistance device (1); The top of the connecting plate (501) is fixedly connected with a protruding block (502), the left side of the middle position of the top of the connecting plate (501) is rotatably connected with a clamping shaft (503), the right side of the middle position of the top of the connecting plate (501) is fixedly connected with a baffle (504), a limiting hole is provided at the center of the baffle (504), an insert rod (505) is slidably connected inside the limiting hole of the baffle (504), the insert rod (505) passes through the clamping shaft (503), and the insert rod (505) is slidably connected to the clamping shaft (503), the other end of the insert rod (505) is fixedly connected with a spring (506), and the other end of the spring (506) is fixedly connected to the clamping shaft (503), the top of the insert rod (505) is fixedly connected with a pulling block (507), and the pulling block (507) is slidably connected to the clamping shaft (503); The protruding block (502) is symmetrically arranged at the top end of the connecting plate (501), and the pressing shaft (503) is located in the internal gap of the protruding block (502); The pressing shaft (503) is provided with a transmission rod (508), the rotating shaft of the transmission rod (508) is rotatably connected to the pressing shaft (503), a torsion spring (509) is sleeved on the outer side of the rotating shaft of the transmission rod (508), and the torsion spring (509) is fixedly connected to the pressing shaft (503), and the right end of the transmission rod (508) is fixedly connected to a pressing rod (510); The extended assembly structure (7) includes a rotating rod (701), the rotating rod (701) passes through the bottom plate (3), and the rotating rod (701) is rotatably connected to the bottom plate (3), the outer side of the rotating rod (701) is sleeved with a stabilizing ring (705), and the stabilizing ring (705) is attracted to the installation area, the outer side of the stabilizing ring (705) is rotatably connected to a clamping plate (702), the bottom end of the clamping plate (702) is rotatably connected to a transmission shaft (703), the other end of the transmission shaft (703) is rotatably connected to a nut (704), and the nut (704) is spirally connected to the thread of the rotating rod (701); An annular groove is provided at the top of the stabilizing ring (705), and a magnetic ring (706) is embedded in the annular groove at the top of the stabilizing ring (705).

2. The quickly assembled vehicle safety driving assistance device according to claim 1, characterized in that: The inner rear side of the storage box (601) is rotatably connected to a data line converter (602), the top of the data line converter (602) is fixedly connected to a closing block (603), and the top front side of the storage box (601) is fixedly connected to a limiting block (604).

3. The quickly assembled vehicle safety driving assistance device according to claim 2, characterized in that: The rear end of the data line converter (602) is fixedly connected to a support leg (605), the bottom end of the support leg (605) is fixedly connected to a magnetic plate (606), and the magnetic plate (606) is in contact with the safe driving assistance device (1).

4. A quickly assembled vehicle safety driving assistance device according to any one of claims 1 to 3, characterized in that: The following steps are included: The Internet of Vehicles is connected to a safe driving assistance device (1) in the vehicle. The safe driving assistance device (1) performs vehicle assistance and safe driving through vehicle-road interaction of the Internet of Vehicles, and the safe driving assistance device (1) performs information interaction. The safe driving assistance device (1) strictly abides by the Internet of Vehicles management and service regulations. The management platform issues tasks to the transportation organization through the safe driving assistance device (1), and the transportation organization dispatches travel services to individual drivers. Finally, a service evaluation is obtained and entered into the Internet of Vehicles intelligence for information retention.

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