Flat wire motor cooling system of an oil cooling path

Abstract

The application relates to the motor technical field, in particular to an oil cooling path flat wire motor cooling system, which comprises a heat dissipation oil channel arranged in the side wall of the shell of the flat wire motor, a heat dissipation box with an internal cavity and containing refrigerant is arranged outside the flat wire motor, a volatilization port is arranged on the heat dissipation box, a liquid inlet pipe is arranged in communication between the heat dissipation box and the liquid inlet port of the heat dissipation oil channel, a liquid outlet pipe is arranged in communication between the heat dissipation box and the liquid outlet port of the heat dissipation oil channel, an elastic oil bag in a spindle type and with an internal cavity is arranged in the heat dissipation box, one end of the elastic oil bag is communicated with the liquid inlet pipe, the other end of the elastic oil bag is communicated with the liquid outlet pipe, and a rolling oil assembly for rolling and extruding the elastic oil bag is further arranged on the heat dissipation box. The application has the advantages of improving the heat dissipation effect of the flat wire motor.

Description

Technical Field

[0001] This application relates to the field of motor technology, and in particular to a cooling system for a flat wire motor with an oil-cooled path. Background Technology

[0002] Flat-wire motors are a new type of motor technology. Their main characteristic is that the stator windings use several thick rectangular wires instead of multiple thin round wires, hence the name "flat wire." Flat-wire motors have a wide range of applications, especially in the field of new energy vehicles. They are powered by battery packs, and the flat-wire motors output torque and speed to enable high-speed driving in new energy vehicles.

[0003] Flat wire motors generate a lot of heat when operating at high efficiency for a long time. If the temperature gets too high, the flat wire motor will malfunction, which may lead to a safety accident. Therefore, it is necessary to take certain cooling measures for flat wire motors.

[0004] The traditional method involves placing a deflector under the hood. During vehicle operation, the deflector guides the airflow from the air intake to the area around the flat wire motor, using air cooling to dissipate heat from the flat wire motor.

[0005] However, air cooling has limited heat dissipation effect, especially in hot weather when the air temperature is already high, resulting in poor heat dissipation for flat wire motors and a significant deficiency. Summary of the Invention

[0006] To improve the heat dissipation effect of flat wire motors, this application provides a flat wire motor cooling system with an oil cooling path.

[0007] The oil-cooled flat wire motor cooling system provided in this application adopts the following technical solution:

[0008] A cooling system for a flat wire motor with an oil-cooled path includes a heat dissipation oil channel formed in the side wall of the flat wire motor housing, a hollow heat dissipation box containing refrigerant arranged outside the flat wire motor, an evaporation port arranged on the heat dissipation box, an inlet pipe connecting the heat dissipation box and the inlet of the heat dissipation oil channel, an outlet pipe connecting the heat dissipation box and the outlet of the heat dissipation oil channel, a spindle-shaped hollow elastic oil bladder placed inside the heat dissipation box, one end of the elastic oil bladder being connected to the inlet pipe and the other end being connected to the outlet pipe, and an oil-strapping assembly for smoothing the elastic oil bladder arranged on the heat dissipation box.

[0009] By adopting the above technical solution, the oil-squeezing assembly squeezes the elastic oil bladder, and the oil enters the cooling oil channel from the inlet pipe. After absorbing heat, it flows back into the elastic oil bladder from the outlet pipe. In this way, the refrigerant absorbs heat from the oil, and part of the refrigerant evaporates and is discharged from the evaporation port. This application uses a combination of air cooling and liquid cooling to dissipate heat from the flat wire motor, thereby improving the heat dissipation effect of the flat wire motor.

[0010] Optionally, the oil-strapping assembly includes an inner slide that slides within the heat sink, a first reciprocating screw that rotates within the heat sink, and an oil-strapping ring that slides outside the elastic oil bladder. A pull wire is connected between the oil-strapping ring and the inner slide. The inner slide is threaded to the first reciprocating screw. The end of the first reciprocating screw rotates out of the heat sink and is fitted with a driven synchronous pulley. An active synchronous pulley is arranged on the output shaft of the flat wire motor, and a synchronous belt is fitted between the active synchronous pulley and the driven synchronous pulley.

[0011] By adopting the above technical solution, when the flat wire motor is working, its output shaft drives the active synchronous pulley to rotate. The active synchronous pulley drives each driven synchronous pulley to rotate via a synchronous belt. The driven synchronous pulleys drive the first reciprocating lead screw to rotate, thereby causing the inner slide to reciprocate linearly within the heat dissipation box. The inner slide slides by pulling the oil-sliding ring via a cable. Because the elastic oil bladder is spindle-shaped and the diameter of the oil-sliding ring is smaller than the maximum diameter of the elastic oil bladder, the elastic oil bladder is compressed and contracts during the oil-sliding process, and the oil inside the elastic oil bladder is squeezed out, thus realizing the flow of oil.

[0012] Optionally, a one-way valve arranged on the heat sink is connected between the elastic oil bladder and the liquid outlet pipe.

[0013] By adopting the above technical solution, the one-way valve ensures that the oil in the elastic oil bladder can only flow out from the inlet pipe in one direction, thus realizing the one-way circulation of oil.

[0014] Optionally, the heat sink is provided with a heat sink cover on its outer peripheral side, with openings on both opposite sides of the heat sink cover, and one end of the heat sink cover is connected to a flow guiding device.

[0015] By adopting the above technical solution, under the action of the air guiding device, the outside air is guided to the space between the heat sink and the heat sink box, which improves the airflow effect around the heat sink box. The flowing air can absorb the heat inside the heat sink box, thereby reducing the amount of refrigerant that absorbs heat and evaporates, thus saving refrigerant.

[0016] Optionally, the heat sink is connected to a liquid replenishment pipe, and the other end of the liquid replenishment pipe relative to the heat sink is hinged with a flexible cap.

[0017] By adopting the above technical solution, users can open the liquid replenishment pipe to add refrigerant to the heat dissipation box, thereby achieving continuous and efficient heat dissipation for the flat wire motor.

[0018] Optionally, the outer rotating frame of the heat sink is provided with a second reciprocating screw parallel to the first reciprocating screw. A driven synchronous pulley is arranged on the second reciprocating screw, and a synchronous belt passes over the driven synchronous pulley. An outer slide is threaded onto the second reciprocating screw. Multiple electromagnets electrically connected to the control system are arranged circumferentially on the outer slide. The inner slide includes four circumferentially distributed right-angle blocks and a telescopic rod assembly located between two adjacent right-angle blocks. The telescopic rod assembly includes an inner slide rod and an outer slide rod that is slidably sleeved outside the inner slide rod. An inclined groove is formed on the inclined surface of the right-angle block along its inclined direction. The outer slide rod and the inner slide rod are slidably engaged with the inclined groove on the corresponding right-angle block. A magnetic block for magnetic attraction with the electromagnet is arranged on the outer slide rod. The oiling ring is elastic.

[0019] By adopting the above technical solution, the synchronous belt drives each driven synchronous pulley to rotate synchronously, so that the first and second reciprocating screws rotate in the same direction, and the outer and inner slides move synchronously and in the same direction in a linear reciprocating motion. The user starts the electromagnet through the control system. The electromagnet generates a magnetic attraction force on the magnet, and the telescopic rod assembly is brought close to the electromagnet by the force, which in turn expands the deformation of the oil ring through the pull wire. In this way, by adjusting the magnitude of the magnetic attraction force, the diameter of the oil ring is changed, so that when the oil ring squeezes the elastic oil bladder, the deformation degree of the elastic oil bladder is different, and the amount of elastic oil bladder squeezed out in a single deformation is different. This ensures that when the flat wire motor is operating at low power, air cooling alone is sufficient for heat dissipation, thus minimizing the degree of liquid cooling involved in heat dissipation and saving refrigerant.

[0020] Optionally, both the inner and outer carriages are coated with polytetrafluoroethylene.

[0021] By adopting the above technical solution, polytetrafluoroethylene has a low coefficient of friction, which helps to improve the smoothness of the reciprocating sliding of the inner and outer slides.

[0022] In summary, this application includes at least one of the following beneficial technical effects:

[0023] 1. The oil-squeezing assembly squeezes the elastic oil bladder, allowing oil to enter the cooling oil channel from the inlet pipe. After absorbing heat, the oil flows back into the elastic oil bladder from the outlet pipe. In this way, the refrigerant absorbs heat from the oil, and some of the refrigerant evaporates and is discharged from the evaporation port. This application uses a combination of air cooling and liquid cooling to dissipate heat from the flat wire motor, improving the heat dissipation effect.

[0024] 2. When the flat wire motor is working, its output shaft drives the driving synchronous pulley to rotate. The driving synchronous pulley drives each driven synchronous pulley to rotate via a synchronous belt. The driven synchronous pulleys drive the first reciprocating lead screw to rotate, thereby causing the inner slide to reciprocate linearly within the heat dissipation box. The inner slide moves the oil-sliding ring by a pull cable. Because the elastic oil bladder is spindle-shaped and the diameter of the oil-sliding ring is smaller than the maximum diameter of the elastic oil bladder, the elastic oil bladder is compressed and contracts during the oil-sliding process, and the oil inside the elastic oil bladder is squeezed out, thus realizing the flow of oil.

[0025] 3. The synchronous belt drives each driven synchronous pulley to rotate synchronously, causing the first and second reciprocating screws to rotate in the same direction, and the outer and inner slides to move synchronously and in the same direction. The user activates the electromagnet through the control system. The electromagnet generates a magnetic attraction force on the magnet, causing the telescopic rod assembly to be pulled closer to the electromagnet, which in turn expands the deformation of the oil ring through the pull wire. By adjusting the magnitude of the magnetic attraction force, the diameter of the oil ring is changed, resulting in different degrees of deformation of the elastic oil bladder when the oil ring squeezes it, and different amounts of oil extruded from the elastic oil bladder in a single deformation. This ensures that when the flat wire motor is operating at low power, air cooling alone is sufficient for heat dissipation, minimizing the role of liquid cooling in heat dissipation, thus saving refrigerant. Attached Figure Description

[0026] Figure 1 This is a structural schematic diagram of an embodiment of this application.

[0027] Figure 2 This is a cross-sectional view showing the positional relationship between the elastic oil bladder, the one-way valve, and the replenishment pipe in the embodiments of this application.

[0028] Figure 3 This is a cross-sectional view showing the positional relationship between the outer carriage, the inner carriage, and the heat sink in the embodiments of this application.

[0029] Explanation of reference numerals in the attached diagram: 1. Flat wire motor; 2. Heat sink; 21. Evaporation port; 3. Liquid inlet pipe; 4. Liquid outlet pipe; 5. Elastic oil bladder; 6. Inner slide; 61. Right-angle block; 611. Inclined slide groove; 62. Telescopic rod assembly; 621. Inner slide rod; 622. Outer slide rod; 7. First reciprocating screw; 8. Oil slicker ring; 9. Pull wire; 10. Driven synchronous pulley; 11. Driven synchronous pulley; 12. Synchronous belt; 13. One-way valve; 14. Heat sink cover; 15. Liquid replenishment pipe; 16. Elastic buckle cover; 17. Second reciprocating screw; 18. Outer slide; 19. Electromagnet; 20. Magnetic block. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0031] This application discloses a flat wire motor cooling system with an oil-cooled path.

[0032] Reference Figure 1 The cooling system of the flat wire motor 1 with a high-efficiency, dead-angle-free oil cooling path includes heat dissipation oil channels (not shown in the figure) opened in the side wall of the housing of the flat wire motor 1. The heat dissipation oil channels are spiral-shaped, thereby extending the flow path of the oil and ensuring that the oil fully absorbs heat from the housing of the flat wire motor 1.

[0033] Reference Figure 1 and Figure 2 The flat wire motor 1 is surrounded by a hollow heat sink 2 filled with refrigerant. The refrigerant used is an existing hydrofluorocarbon (HFC) refrigerant, such as R-134a and R-410A. A liquid inlet pipe 3 connects the heat sink 2 to the liquid inlet of the cooling oil channel, and a liquid outlet pipe 4 connects the heat sink 2 to the liquid outlet of the cooling oil channel. A one-way valve 13, threadedly connected to the heat sink 2, connects the elastic oil bladder 5 to the liquid outlet pipe 4.

[0034] Reference Figure 1 and Figure 2 The heat exchanger 2 is connected to an evaporation port 21. After absorbing heat, the refrigerant evaporates into a gaseous state and is discharged from the evaporation port 21. The heat exchanger 2 is connected to a liquid replenishment pipe 15. The other end of the liquid replenishment pipe 15 is hinged to a flexible cap 16, allowing the user to replenish refrigerant into the heat exchanger 2 through the liquid replenishment pipe 15.

[0035] Reference Figure 1 and Figure 2 The heat sink 2 contains a spindle-shaped, hollow elastic oil bladder 5. One end of the elastic oil bladder 5 is connected to the liquid inlet pipe 3, and the other end is connected to the one-way valve 13. The heat sink 2 is also equipped with an oil-squeezing assembly for squeezing the elastic oil bladder 5.

[0036] Reference Figure 1 , Figure 2 and Figure 3 The oil-lubricating assembly includes an inner slide 6 that slides within the heat sink 2 and four first reciprocating screws 7 that are rotatably mounted within the heat sink 2. The inner slide 6 is threaded to each of the first reciprocating screws 7 and is coated with polytetrafluoroethylene. An oil-lubricating ring 8 is slidably sleeved on the outer side of the elastic oil bladder 5. The oil-lubricating ring 8 is elastic, and multiple pull wires 9 are connected between the oil-lubricating ring 8 and the inner slide 6.

[0037] Reference Figure 1 , Figure 2 and Figure 3 The end of the first reciprocating screw 7 rotates out of the heat sink 2 and is fixedly fitted with a driven synchronous pulley 10. The output shaft of the flat wire motor 1 is fixedly fitted with a driving synchronous pulley 11. The driving synchronous pulley 11 and each driven synchronous pulley 10 are fitted with a synchronous belt 12.

[0038] Reference Figure 1 , Figure 2 and Figure 3 When the flat wire motor 1 is working, its output shaft drives the active synchronous wheel 11 to rotate. The active synchronous wheel 11 drives the driven synchronous wheel 10 to rotate through the synchronous belt 12. The driven synchronous wheel 10 drives the first reciprocating lead screw 7 to rotate, thereby realizing the reciprocating linear movement of the inner slide 6 in the heat dissipation box 2.

[0039] Reference Figure 1 , Figure 2 and Figure 3 During the reciprocating movement of the inner slide 6 within the heat sink 2, it pulls the oil-smoothing ring 8 synchronously via various pull lines 9. The oil-smoothing ring 8 can compress the elastic oil bladder 5. Due to the limitation of the one-way valve 13, the oil in the elastic oil bladder 5 can only enter the heat sink oil passage through the inlet pipe 3.

[0040] Reference Figure 1 and Figure 2 After absorbing heat, the oil flows back to the elastic oil bladder 5 through the liquid outlet pipe 4 and the one-way valve 13. The refrigerant in the heat sink 2 absorbs heat from the oil. After absorbing heat, part of the refrigerant evaporates into a gaseous state and is discharged from the evaporation port 21.

[0041] Reference Figure 1 and Figure 2 The above-described method, employing liquid cooling, effectively dissipates heat from the flat wire motor 1, improving heat dissipation efficiency. Furthermore, the oil flow is powered by the operation of the flat wire motor 1 itself, eliminating the need for an additional oil pump and saving energy.

[0042] Reference Figure 2 The heat sink 2 is provided with a heat sink 14 on its outer periphery. The heat sink 14 has openings on both sides opposite each other. One end of the heat sink 14 is connected to a flow guiding device (not shown in the figure). The flow guiding device adopts existing technology.

[0043] During operation, the airflow guiding device directs outside air to the space between the heat sink 14 and the heat sink 2, increasing the airflow intensity around the heat sink 2. This allows the air to absorb heat from the heat sink 2, reducing the amount of refrigerant volatilized and thus saving refrigerant.

[0044] Reference Figure 1 , Figure 2 and Figure 3 The heat sink 2 has a second reciprocating screw 17 parallel to the first reciprocating screw 7 on its outer rotating frame. A driven synchronous pulley 10 is also fixedly sleeved on the end of the second reciprocating screw 17. A synchronous belt 12 passes around the driven synchronous pulley 10. An outer slide 18 is threadedly connected to the second reciprocating screw 17. The outer slide 18 is also coated with polytetrafluoroethylene. A plurality of electromagnets 19 electrically connected to the control system are arranged circumferentially on the outer slide 18.

[0045] Reference Figure 1 , Figure 2and Figure 3 The inner carriage 6 includes four right-angled blocks 61 arranged circumferentially, and telescopic rod groups 62 located between two adjacent right-angled blocks 61. The inclined surface of the right-angled blocks 61 faces the axis of the elastic oil bladder 5, and one telescopic rod group 62 corresponds to one electromagnet 19.

[0046] The telescopic rod assembly 62 includes an inner slide rod 621 and an outer slide rod 622 that is slidably sleeved outside the inner slide rod 621. A magnetic block 20 is arranged on the outer slide rod 622 to magnetically attract the corresponding electromagnet 19. An inclined groove 611 is formed on the inclined surface of the right-angle block 61 along its inclined direction. Both the outer slide rod 622 and the inner slide rod 621 slide in cooperation with the inclined groove 611 on the corresponding right-angle block 61.

[0047] Reference Figure 1 , Figure 2 and Figure 3 The output shaft of the flat wire motor 1 transmits power to the second reciprocating lead screw 17, thereby enabling the outer slide 18 and the inner slide 6 to reciprocate synchronously and in the same direction. The user activates the electromagnet 19 through the control system, which generates a magnetic attraction force on the magnetic block 20, causing the telescopic rod assembly 62 to be pulled away from the axis of the elastic oil bladder 5.

[0048] During this process, the inner slide rod 621 will be further inserted into the outer slide rod 622, and the outer slide rod 622 will apply tension to the oil ring 8 through the pull wire 9. Since the oil ring 8 itself is elastic, multiple pull wires 9 work together to expand and deform the oil ring 8, thereby controlling the diameter of the oil ring 8.

[0049] Reference Figure 2 and Figure 3 The larger the diameter of the oil ring 8, the less it compresses the elastic oil bladder 5 during its reciprocating linear motion, and the less oil circulates due to the single deformation of the elastic oil bladder 5.

[0050] Reference Figure 1 , Figure 2 and Figure 3 When the driving speed is slow, the flat wire motor 1 operates at low power. At this time, liquid cooling is not required, and air cooling alone is sufficient to meet the heat dissipation requirements of the flat wire motor 1. At this time, the unidirectional circulation flow of oil is small or close to zero, and less heat is transferred to the heat sink 2. This achieves the regulation of the liquid cooling effect and further saves refrigerant.

[0051] The implementation principle of a flat wire motor cooling system with an oil-cooled path according to an embodiment of this application is as follows:

[0052] When the flat wire motor 1 is working, its output shaft drives the active synchronous pulley 11 to rotate. The active synchronous pulley 11 drives the driven synchronous pulley 10 to rotate through the synchronous belt 12. The driven synchronous pulley 10 drives the first reciprocating lead screw 7 to rotate, thereby realizing the reciprocating linear movement of the inner slide 6 in the heat dissipation box 2.

[0053] As the inner carriage 6 reciprocates within the heat exchanger 2, it pulls the oil-strapping rings 8 synchronously via various pull cables 9. The oil-strapping rings 8 compress the elastic oil bladder 5. Due to the one-way valve 13, the oil in the elastic oil bladder 5 can only enter the heat exchanger oil passage through the inlet pipe 3. After absorbing heat, the oil flows back to the elastic oil bladder 5 through the outlet pipe 4 and the one-way valve 13. The refrigerant in the heat exchanger 2 absorbs heat from the oil, and some of the refrigerant evaporates into a gaseous state after absorbing heat and is discharged from the evaporation port 21.

[0054] When the flat wire motor 1 is in low-power operation, the user activates the electromagnet 19 through the control system. The electromagnet 19 generates a magnetic attraction force on the magnetic block 20, causing the telescopic rod assembly 62 to be pulled away from the axis of the elastic oil bladder 5. During this process, the inner sliding rod 621 is further inserted into the outer rod 622, which then applies tension to the oil-strapping ring 8 through the pull wire 9. Since the oil-strapping ring 8 is elastic, multiple pull wires 9 work together to expand and deform the oil-strapping ring 8, thereby controlling the diameter of the oil-strapping ring 8. The larger the diameter of the oil-strapping ring 8, the less it compresses the elastic oil bladder 5 during its reciprocating linear motion, and the less oil circulates during a single deformation of the elastic oil bladder 5. This, in turn, adjusts the liquid cooling effect according to the actual operating power of the flat wire motor 1.

[0055] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An oil-cooled path flat wire motor cooling system, characterized by: The application relates to a heat dissipation device of a flat wire motor, which comprises a heat dissipation oil channel arranged in the side wall of the shell of the flat wire motor (1), a heat dissipation box (2) with an internal cavity and containing refrigerant is arranged outside the flat wire motor (1), a volatilization port (21) is arranged on the heat dissipation box (2), a liquid inlet pipe (3) is arranged in communication between the heat dissipation box (2) and the liquid inlet port of the heat dissipation oil channel, a liquid outlet pipe (4) is arranged in communication between the heat dissipation box (2) and the liquid outlet port of the heat dissipation oil channel, an elastic oil bag (5) with a spindle shape and an internal cavity is arranged in the heat dissipation box (2), one end of the elastic oil bag (5) is communicated with the liquid inlet pipe (3), the other end is communicated with the liquid outlet pipe (4), and a rolling oil assembly for rolling and extruding the elastic oil bag (5) is further arranged on the heat dissipation box (2). The rolling oil assembly comprises an inner sliding frame (6) sliding in the heat dissipation box (2), a first reciprocating wire rod (7) rotatably arranged in the heat dissipation box (2), and a rolling oil ring (8) slidingly sleeved outside the elastic oil bag (5), a pull wire (9) is arranged between the rolling oil ring (8) and the inner sliding frame (6), the inner sliding frame (6) is threadedly connected to the first reciprocating wire rod (7), the end of the first reciprocating wire rod (7) is rotatably arranged outside the heat dissipation box (2) and sleeved with a driven synchronous wheel (10), a driving synchronous wheel (11) is arranged on the output shaft of the flat wire motor (1), the driving synchronous wheel (11) and the driven synchronous wheel (10) are sleeved with a synchronous belt (12), and a one-way valve (13) is arranged on the heat dissipation box (2) in communication between the elastic oil bag (5) and the liquid outlet pipe (4).

2. An oil-cooled fractional-slot flat wire motor cooling system according to claim 1, characterized in that: A heat dissipation cover (14) is circumferentially arranged on the heat dissipation box (2), the heat dissipation cover (14) is open on the opposite sides, and one end of the heat dissipation cover (14) is communicated with the flow guide device.

3. An oil-cooled fractional-slot flat motor cooling system according to claim 1, characterized in that: A liquid supplement pipe (15) is arranged in communication with the heat dissipation box (2), and an elastic buckle cover (16) is hingedly arranged on the other end of the liquid supplement pipe (15) relative to the heat dissipation box (2).

4. An oil-cooled fractional-slot flat motor cooling system according to claim 1, characterized in that: A second reciprocating wire rod (17) parallel to the first reciprocating wire rod (7) is rotatably arranged outside the heat dissipation box (2), the driven synchronous wheel (10) is arranged on the second reciprocating wire rod (17) and the synchronous belt (12) is wound around the driven synchronous wheel (10), an outer sliding frame (18) is threadedly connected to the second reciprocating wire rod (17), and a plurality of electromagnets (19) electrically connected to a control system are circumferentially arranged on the outer sliding frame (18).

5. An oil-cooled fractional-slot flat wire motor cooling system according to claim 4, characterized in that: The inner sliding frame (6) comprises four right-angle blocks (61) distributed in a circumferential direction, a telescopic rod group (62) arranged between two adjacent right-angle blocks (61), the telescopic rod group (62) comprises an inner sliding rod (621) and an outer sleeve rod (622) slidingly sleeved outside the inner sliding rod (621), an inclined sliding groove (611) is arranged on the inclined surface of the right-angle block (61) along the inclined direction of the inclined surface, the outer sleeve rod (622) and the inner sliding rod (621) are slidingly matched with the inclined sliding groove (611) on the corresponding right-angle block (61), a magnetic block (20) is arranged on the outer sleeve rod (622) and used for being magnetically attracted to the electromagnet (19), and the rolling oil ring (8) is elastic. Polytetrafluoroethylene is coated on the inner sliding frame (6) and the outer sliding frame (18).

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