Inflation pump

Abstract

The invention discloses an inflating pump which comprises a shell, a motor, an end face gear, a cylinder barrel and a connecting rod. The end face gear is rotationally arranged in the shell, the transmission end of the motor is in transmission engagement with the end face gear, one end of the connecting rod is eccentrically and rotationally arranged on the end face gear, and a piston is arranged at the other end of the connecting rod and slidably arranged in the cylinder barrel. The first fan is integrally arranged on the rotor of the motor, the first air outlet corresponding to the first fan is formed in the shell, and by arranging the first fan on the rotor, the first fan can be synchronously driven to rotate in the whole inflating process of the inflating pump, so that heat in the motor and the shell is extracted out through the first air outlet; therefore, normal and efficient work of the inflating pump is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of air pumps, and in particular to an air pump. Background Art

[0002] An air pump, also known as an air pump, an air pump, or an inflation pump, is a common air pump that works by the operation of a motor. When the motor is running, the valve of the communicating vessel is opened by the atmospheric pressure, and the gas enters the air cylinder. When air is inflated into the tire, the valve is closed by the air pressure in the air cylinder, and the gas enters the tire.

[0003] When the air pump is working, the internal motor rotates at high speed, which will cause the temperature inside the air pump to rise. Especially for small portable air pumps, the external shell size is small and the internal heat flow is blocked, resulting in poor heat dissipation effect. Summary of the invention

[0004] The purpose of this application is to provide an air pump to solve the above problems.

[0005] To achieve the above purpose, the technical solution of this application is: An air pump comprises a shell, a motor, an end gear, a cylinder and a connecting rod; the end gear is rotatably arranged inside the shell, the transmission end of the motor is in transmission meshing with the end gear, one end of the connecting rod is eccentrically rotatably arranged on the end gear, the other end of the connecting rod is provided with a piston, and the piston is slidably arranged in the cylinder; a first fan is integrally provided on the rotor of the motor, and a first air outlet is provided on the shell corresponding to the first fan.

[0006] Preferably, the shell is provided with an air inlet, a rotating shaft is rotatably provided in the air inlet, a first gear is provided at one end of the rotating shaft, the first gear and the end face gear are meshed with each other, and a second fan is provided on the rotating shaft; the shell is provided with a partition plate for isolating the area where the end face gear is located and the area where the cylinder is located, and the partition plate is provided with a through hole; the partition plate is located in the fan-shaped area inside the shell close to the air inlet; the shell is provided with a second air outlet.

[0007] Preferably, a rotating frame is sleeved on the exterior of the shell, and a fixing part for fixing the air pump is provided on the rotating frame.

[0008] Preferably, the rotating frame includes a support rod and two rotating rings, the shell is provided with a rotating groove, and the two rotating rings are correspondingly clamped in the rotating groove; the two ends of the support rod are respectively connected to the rotating rings, and the fixing piece is arranged on the support rod.

[0009] Preferably, the fixing member includes a support plate, an adjusting ring, an abutment head and two claws, the support plate is arranged on the support rod, the adjusting ring is coaxially rotatably arranged on the support plate, one end of the abutment head is slidably arranged on the support plate along its own axial direction, and the other end of the abutment head passes through the interior of the adjusting ring and is threadedly connected to the adjusting ring; a limit sleeve is provided on the support plate, and two abutment slopes are provided at one end of the abutment head away from the support plate, one end of the two claws are respectively slidably connected to the abutment slopes, and the claw is elastically connected to the inner wall of the limit sleeve on the side facing away from the abutment slope.

[0010] Preferably, a T-shaped slide groove is provided on the abutting inclined surface, and a T-shaped slide bar is correspondingly provided on the clamping claw, and the T-shaped slide bar is slidably arranged in the T-shaped slide groove.

[0011] Preferably, an arc-shaped spring piece is provided in the limiting sleeve, and the arc-shaped spring piece is located between the clamping claw and the inner wall of the limiting sleeve.

[0012] Preferably, the limiting sleeve and the supporting plate are connected via a connecting rod, the adjusting ring is located between the supporting plate and the limiting sleeve, an annular groove is provided on the supporting plate, and the adjusting ring is slidably embedded in the annular groove.

[0013] Preferably, the support rod is provided with a sliding block, the sliding block is provided with a mounting plate, and the support plate is rotatably arranged on the mounting plate.

[0014] Preferably, it further comprises an integrated circuit board, and the integrated circuit board is electrically connected to the motor.

[0015] The air pump disclosed in the present application has a compact structure. In order to ensure the heat dissipation performance of the air pump, a first fan is arranged on the rotor of the motor. When the motor rotates, the first fan rotates synchronously, thereby playing a certain heat dissipation role for the motor and the interior of the shell; correspondingly, a first air outlet is also arranged on the shell corresponding to the first fan, so that heat can be extracted to the outside of the shell by the first fan; by arranging the first fan on the rotor, when the entire air pump is inflated, it will synchronously drive the first fan to rotate, thereby extracting the heat in the motor and the shell through the first air outlet, so as to ensure the normal and efficient operation of the air pump.

[0016] Furthermore, a fixing part is provided on the shell, and the fixing part can be adjusted in multiple directions and angles relative to the shell, so that when the air pump is suspended only by the air pipe, the fixing part can be fixed to the inflatable part, thereby reducing the load on the air pipe to reduce the risk of damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of this application; Figure 2 This is a schematic diagram of the overall internal structure of this application; Figure 3 for Figure 2 A partial enlarged schematic diagram in the middle; Figure 4 This is a cross-sectional view of the air inlet in the shell of this application; Figure 5 This is a cross-sectional view of the fixing member in the housing of the present application (the partition plate is not shown); Figure 6 for Figure 5 A partial enlarged schematic diagram of the middle structural member (the sliding rod and sliding hole are not shown); Figure 7 This is a schematic diagram of the structure of the slider and the mounting plate in this application; Figure 8 This is a left side view of the motor in this application; Fig. 9 This is the front view of the motor in this application; Fig.10 This is a schematic diagram of the structure of the second air outlet on the shell in this application; Fig.11 This is a cross-sectional view of the internal structure of the fixing member in this application.

[0018] In the figure: 1. Shell; 10. First air outlet; 11. Rotating shaft; 12. Second fan; 13. Partition plate; 130. Through hole; 20. Rotating ring; 21. Support rod; 210. Sliding block; 211. Mounting plate; 3. Fixing member; 30. Support plate; 31. Connecting rod; 32. Limiting sleeve; 320. Sliding hole; 33. Adjusting ring; 34. Abutting head; 340. Abutting inclined surface; 35. Clamping claw; 350. Sliding rod; 36. Arc-shaped spring piece; 360. Clearance hole; 4. Motor; 40. Rotating tooth; 41. First gear; 42. Rotor; 43. First fan; 44. Air inlet; 5. End gear; 50. Articulated column; 6. Connecting rod; 7. Integrated circuit board; 8. Cylinder; 80. Fixing frame. DETAILED DESCRIPTION

[0019] The present application is now described in further detail in conjunction with the accompanying drawings. The accompanying drawings are simplified schematic diagrams, which only illustrate the basic structure of the present application in a schematic manner, and therefore only show the components related to the present application.

[0020] like Figure 1-11As shown, an air pump includes a shell 1, a motor 4, an end gear 5, a cylinder 8, and a connecting rod 6; the end gear 5 is rotatably arranged inside the shell 1, the transmission end of the motor 4 is in transmission meshing with the end gear 5, one end of the connecting rod 6 is eccentrically rotatably arranged on the end gear 5, and the other end of the connecting rod 6 is provided with a piston, which is slidably arranged in the cylinder 8; a first fan 43 is integrally provided on the rotor 42 of the motor 4, and a first air outlet 10 is provided on the shell 1 corresponding to the first fan 43.

[0021] The end face gear 5 is rotatably arranged inside the housing 1. The motor 4 is arranged at one end (the tail) of the housing 1. The transmission end of the motor 4 is provided with a rotating tooth 40. The rotating tooth 40 is meshed with the end face gear 5. When the motor 4 rotates, the rotating tooth 40 rotates, thereby driving the end face gear 5 to rotate.

[0022] In some other embodiments, the end face gear 5 is an end face helical gear, and the rotating tooth 40 is a rotating helical gear.

[0023] One end of the connecting rod 6 is provided with a piston, and the other end is hingedly arranged on the end face gear 5.

[0024] Specifically, a hinge column 50 is provided on the end face gear 5, and the hinge column 50 and the end of the connecting rod 6 are hinged to each other, and the hinge column 50 is eccentrically arranged on the end face of the end face gear 5. When the end face gear 5 rotates, the hinged end of the connecting rod 6 will rotate, thereby driving the end of the connecting rod 6 where the piston is set to move in the cylinder 8 to achieve inflation.

[0025] The motor 4 in this embodiment is a brushless motor 4. Since the entire air pump has a compact structure, in order to ensure the heat dissipation performance of the air pump, a first fan 43 is provided on the rotor 42 of the motor 4. When the motor 4 rotates, the first fan 43 rotates synchronously, thereby playing a certain heat dissipation role on the motor 4 and the interior of the housing 1.

[0026] Correspondingly, a first air outlet 10 is further provided on the housing 1 corresponding to the first fan 43 , so that the heat is drawn out to the outside of the housing 1 by the first fan 43 .

[0027] By arranging the first fan 43 on the rotor 42, when the entire air pump is inflating, the first fan 43 will be driven to rotate synchronously, so that the heat in the motor 4 and the shell 1 is extracted through the first air outlet 10 to ensure the normal and efficient operation of the air pump.

[0028] In some further embodiments, an air inlet 44 is provided on the shell 1, a rotating shaft 11 is rotatably provided in the air inlet 44, a first gear 41 is provided at one end of the rotating shaft 11, the first gear 41 is meshed with the end face gear 5, and a second fan 12 is provided on the rotating shaft 11; a partition plate 13 is provided on the shell 1 to separate the area where the end face gear 5 is located and the area where the cylinder 8 is located, and a through hole 130 is provided on the partition plate 13; the partition plate 13 is located in the fan-shaped area inside the shell 1 close to the air inlet 44; a second air outlet 14 is provided on the shell 1.

[0029] Reference Figure 4 and Fig.10 As shown, specifically, the second air outlet 14 is arranged on the housing 1 in an area corresponding to the position of the cylinder 8 , and is opposite to the position of the through hole 130 across the cylinder 8 .

[0030] In the entire air pump, in addition to the heat generated by the motor 4, the different reciprocating frictions between the piston and the cylinder 8 will also generate a large amount of heat. Therefore, in the present embodiment, an air inlet 44 is provided on the shell 1, and a second fan 12 is rotatably provided in the air inlet 44. Specifically, the second fan 12 is provided on the rotating shaft 11, and the rotating shaft 11 is rotatably provided on the shell 1. A first gear 41 is provided at one end of the rotating shaft 11, and the first gear 41 is meshed with the end gear 5. When the end gear 5 rotates, the first gear 41 rotates synchronously, thereby driving the second fan 12 to rotate. When the second fan 12 rotates, air with relatively low external temperature can be drawn into the shell 1. After entering the shell 1, the air will first cool down the area where the end gear 5 is located in the middle of the shell 1, and then enter the two ends of the shell 1, namely, the position where the first air outlet 10 is located and the position where the cylinder 8 is located. , the airflow flowing into the first air outlet 10 will flow out from the first air outlet 10, so that the airflow forms a cycle inside the shell 1 to improve the heat dissipation efficiency; and the airflow flowing into the cylinder 8 area through the other half of the area opposite to the area where the partition plate 13 is located will flow out from the second air outlet 14 to form another cycle; in addition, the airflow entering the shell 1 through the air inlet 44 will also flow to the vicinity of the cylinder 8 through the through hole 130 on the partition plate 13, and after flowing through the outer peripheral wall of the cylinder 8, it will be discharged from the second air outlet 14. It should be noted that the airflow entering the area where the cylinder 8 is located from the area where the end gear 5 is located and the airflow entering the area near the cylinder 8 from the through hole 130 will merge and influence each other, so as to be fully diffused on the outer peripheral wall of the cylinder 8, thereby forming an annular airflow area on the periphery of the cylinder 8 to efficiently exchange heat.

[0031] It can be imagined that the better the cooling effect of the cylinder 8, the lower the probability of high-temperature wear of the sealing gasket in the piston. Therefore, by cooling the cylinder 8, the service life of the piston can be better extended and the overall quality of the product can be improved.

[0032] It should be noted that the airflow directly entering the area where the cylinder 8 is located from the area where the end gear 5 is located and the airflow entering the area near the cylinder 8 from the through hole 130 both flow out from the same outlet, namely the second air outlet 14, so that turbulence will not be formed near the cylinder 8.

[0033] A fixing frame 80 is provided inside the housing 1, and the fixing frame 80 is connected to the housing 1 by screws, and the cylinder 8 is fixedly arranged in the fixing frame 80. The arrangement of the cylinder 8 and the fixing frame 80 is already relatively common in the air pump industry and is a prior art, and its specific structure is not repeated in this embodiment.

[0034] In some further embodiments, a rotating frame is provided on the exterior of the housing 1, and a fixing member 3 for fixing the air pump is provided on the rotating frame.

[0035] A rotating frame is arranged outside the housing 1, and a fixing member 3 is arranged on the rotating frame. The fixing member 3 is mainly used for fixing with a tire or an inflatable member.

[0036] Taking tires as an example, when inflating the tires, the valve nozzles on some tires may be relatively close to the ground, so that the air pump can be placed directly on the ground when using an air pump for inflating. However, the valve nozzles on some tires may be located above the tires. If an air pump is used for inflating, the entire air pump will be suspended in the air only through the air pipe. Over time, the connection between the air pipe and the valve nozzle, and the connection between the air pipe and the air pump are prone to damage and cause air leakage.

[0037] In view of the above situation, in this embodiment, a fixing part 3 is provided on the shell 1, and the fixing part 3 can be adjusted in multiple directions and angles relative to the shell 1. Therefore, when the air pump is suspended only by the air pipe, the fixing part 3 can be fixed to the inflatable part, thereby reducing the load on the air pipe to reduce the risk of damage.

[0038] In some further embodiments, the rotating frame includes a support rod 21 and two rotating rings 20, a rotating groove is provided on the shell 1, and the two rotating rings 20 are correspondingly clamped in the rotating groove; the two ends of the support rod 21 are respectively connected to the rotating ring 20, and the fixing member 3 is arranged on the support rod 21.

[0039] A rotating groove is set on the shell 1, and there are two rotating grooves. The two rotating grooves are respectively located near the two ends of the shell 1; the rotating frame includes a support rod 21 and two rotating rings 20, and the two rotating rings 20 are respectively rotatably set in the rotating grooves, and the two ends of the support rod 21 are respectively connected to the two rotating rings 20, and the fixing part 3 is set on the support rod 21.

[0040] In some further embodiments, the fixing member 3 includes a support plate 30, an adjusting ring 33, a butt joint 34 and two claws 35. The support plate 30 is arranged on the support rod 21, the adjusting ring 33 is coaxially rotatably arranged on the support plate 30, one end of the butt joint 34 is slidably arranged on the support plate 30 along its own axial direction, and the other end of the butt joint 34 passes through the interior of the adjusting ring 33 and is threadedly connected to the adjusting ring 33; a limit sleeve 32 is provided on the support plate 30, and two abutment slopes 340 are provided at one end of the butt joint 34 away from the support plate 30, one end of the two claws 35 are respectively slidably connected to the abutment slopes 340, and the side of the claw 35 facing away from the abutment slope 340 is elastically connected to the inner wall of the limit sleeve 32.

[0041] Specifically, the support plate 30 is located on the support rod 21, and the adjusting ring 33 can rotate relative to the support plate 30. The support plate 30 and the adjusting ring 33 are coaxially arranged. One end of the abutment joint 34 is slidably arranged with the support plate 30, that is, it slides through the support plate 30. At the same time, the outer peripheral wall of the abutment joint 34 is also threadedly connected with the inner wall of the adjusting ring 33. When the adjusting ring 33 is rotated, the abutment joint 34 will move along the axial direction of the adjusting ring 33.

[0042] A limiting sleeve 32 is provided on the support plate 30 through a connecting rod 31, one end face of the limiting sleeve 32 is connected to one end of the connecting rod 31, and the other end of the connecting rod 31 is connected to the support plate 30. There are two connecting rods 31 to leave enough space between the support plate 30 and the limiting sleeve 32 for rotating the adjusting ring 33.

[0043] One end of the abutment joint 34 is located in the limiting ring, and two abutment slopes 340 are symmetrically provided on the end, and the abutment slopes 340 are used to be slidably connected with the claws 35, and the claws 35 are elastically connected to the inner wall of the limiting sleeve 32. For example, when the adjusting ring 33 is rotated in one direction, the abutment is moved away from the support disk 30, and the abutment slopes 340 on the abutment joint 34 abut against the claws 35, and the two claws 35 are gradually separated under the abutment action of the abutment joint 34, so that the claws 35 open to clamp the inflatable part. When the adjusting ring 33 is rotated in another opposite direction, the abutment joint 34 moves close to the support disk 30, and the claws 35 are elastically acted upon to close, so as to clamp the inflatable part and fix it.

[0044] In some other embodiments, a sliding rod 350 is provided on the claw 35, and a sliding hole 320 is provided on the limiting sleeve 32. The axial direction of the sliding hole 320 is consistent with the direction in which the two claws 35 approach or move away from each other. The sliding rod 350 is slidably set in the sliding hole 320; the limiting claw 35 moves axially relative to the limiting sleeve 32.

[0045] In some further embodiments, a T-shaped slide groove is provided on the abutting inclined surface 340 , and a T-shaped slide bar is provided on the claw 35 , and the T-shaped slide bar is slidably disposed in the T-shaped slide groove.

[0046] In order to ensure the connection between the abutment rod and the claw 35, a T-shaped groove is provided on the abutment slope 340, and a T-shaped slide bar is provided on the claw 35. The T-shaped slide bar is slidably arranged in the T-shaped groove, thereby ensuring that the two can achieve sliding cooperation and maintain connection.

[0047] In some further embodiments, an arc-shaped spring piece 36 is disposed in the limiting sleeve 32 , and the arc-shaped spring piece 36 is located between the claw 35 and the inner wall of the limiting sleeve 32 .

[0048] The elastic connection between the claw 35 and the limiting sleeve 32 is achieved through an arc-shaped spring piece 36 . The arc-shaped spring piece 36 has a wavy structure and is provided with a clearance hole 360 ​​for the sliding rod 350 to pass through.

[0049] The locking of the claw 35 is achieved by the arc-shaped spring piece 36, rather than the clamping achieved by the traditional mechanical physical force, so as to better protect the clamped part, such as the wheel hub.

[0050] Under the action of the sliding rod 350 , the arc-shaped spring piece 36 is limited to a certain extent, thereby avoiding displacement failure during the movement of the claw 35 .

[0051] In some further embodiments, the limiting sleeve 32 is connected to the support plate 30 via a connecting rod 31, the adjusting ring 33 is located between the support plate 30 and the limiting sleeve 32, an annular groove is provided on the support plate 30, and the adjusting ring 33 is slidably embedded in the annular groove.

[0052] The end surface of the adjusting ring 33 is slidably embedded in the annular sliding groove to ensure the stability of the adjusting ring 33 during the rotation process.

[0053] In order to prevent the adjustment ring 33 from slipping out of the annular groove, in some other embodiments, a clamping ring can be provided on the outer peripheral wall of the adjustment ring 33, and an annular clamping groove can be correspondingly provided on the groove wall of the annular groove, so that the clamping ring can be clamped in the annular clamping groove to limit the adjustment ring 33.

[0054] In some further embodiments, a slider 210 is provided on the support rod 21 , a mounting plate 211 is provided on the slider 210 , and the support plate 30 is rotatably disposed on the mounting plate 211 .

[0055] In order to improve the flexibility of the fixing part 3, a slider 210 is slidably arranged on the support rod 21, and the slider 210 can slide relative to the support rod 21. Specifically, the slider 210 can be sleeved on the support rod 21, and a fastening screw can be arranged on the slider 210. When the fastening screw is tightened, the slider 210 is locked relative to the support rod 21, and when the fastening screw is loosened, the slider 210 is unlocked relative to the support rod 21.

[0056] The support plate 30 is rotatably arranged on the mounting plate 211. Specifically, mounting holes are arranged on the support plate 30 and the mounting plate 211, and mounting shafts and bearings are arranged in the mounting holes, and interference fit is adopted, so as to realize the rotation between the support plate 30 and the mounting plate 211.

[0057] In some further embodiments, an integrated circuit board 7 is further included, and the integrated circuit board 7 is electrically connected to the motor 4 .

[0058] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection created by this application.

Claims

1. An air pump, characterized in that: The invention comprises a housing (1), a motor (4), an end gear (5), a cylinder (8), and a connecting rod (6); the end gear (5) is rotatably arranged inside the housing (1), the transmission end of the motor (4) is in transmission meshing engagement with the end gear (5), one end of the connecting rod (6) is eccentrically rotatably arranged on the end gear (5), the other end of the connecting rod (6) is provided with a piston, and the piston is slidably arranged in the cylinder (8); a first fan (43) is integrally provided on the rotor (42) of the motor (4), and a first air outlet (10) is provided on the housing (1) corresponding to the first fan (43).

2. The air pump according to claim 1, characterized in that: The shell (1) is provided with an air inlet (44), a rotating shaft (11) is rotatably provided in the air inlet (44), a first gear (41) is provided at one end of the rotating shaft (11), the first gear (41) and the end face gear (5) are meshed with each other, and a second fan (12) is provided on the rotating shaft (11); the shell (1) is provided with a partition plate (13) for isolating an area where the end face gear (5) is located from an area where the cylinder (8) is located, and a through hole (130) is provided on the partition plate (13); the partition plate (13) is located in a fan-shaped area inside the shell (1) close to the air inlet (44); and the shell (1) is provided with a second air outlet (14).

3. The air pump according to claim 2, characterized in that: The outer portion of the housing (1) is provided with a rotating frame, and the rotating frame is provided with a fixing member (3) for fixing the air pump.

4. The air pump according to claim 3, characterized in that: The rotating frame comprises a support rod (21) and two rotating rings (20); a rotating groove is provided on the housing (1), and the two rotating rings (20) are correspondingly clamped in the rotating groove; both ends of the support rod (21) are respectively connected to the rotating rings (20); and the fixing member (3) is arranged on the support rod (21).

5. The air pump according to claim 4, characterized in that: The fixing member (3) comprises a supporting plate (30), an adjusting ring (33), an abutting joint (34) and two claws (35); the supporting plate (30) is arranged on the supporting rod (21); the adjusting ring (33) is coaxially rotatably arranged on the supporting plate (30); one end of the abutting joint (34) is slidably arranged on the supporting plate (30) along its own axial direction; the other end of the abutting joint (34) passes through the interior of the adjusting ring (33) and is threadedly connected to the adjusting ring (33); a limiting sleeve (32) is provided on the supporting plate (30); two abutting inclined surfaces (340) are provided at one end of the abutting joint (34) away from the supporting plate (30); one end of the two claws (35) is slidably connected to the abutting inclined surfaces (340) respectively; and a side of the claw (35) facing away from the abutting inclined surfaces (340) is elastically connected to the inner wall of the limiting sleeve (32).

6. The air pump according to claim 5, characterized in that: The abutting inclined surface (340) is provided with a T-shaped sliding groove, and the clamping claw (35) is provided with a T-shaped sliding bar, and the T-shaped sliding bar is slidably arranged in the T-shaped sliding groove.

7. The air pump according to claim 6, characterized in that: An arc-shaped spring piece (36) is provided in the limiting sleeve (32), and the arc-shaped spring piece (36) is located between the clamping claw (35) and the inner wall of the limiting sleeve (32).

8. The air pump according to claim 7, characterized in that: The limiting sleeve (32) and the supporting plate (30) are connected via a connecting rod (31); the adjusting ring (33) is located between the supporting plate (30) and the limiting sleeve (32); an annular sliding groove is provided on the supporting plate (30); and the adjusting ring (33) is slidably embedded in the annular sliding groove.

9. The air pump according to claim 8, characterized in that: A slider (210) is provided on the support rod (21), a mounting plate (211) is provided on the slider (210), and the support plate (30) is rotatably mounted on the mounting plate (211).

10. The air pump according to claim 9, characterized in that: It also includes an integrated circuit board (7), wherein the integrated circuit board (7) is electrically connected to the motor (4).

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