TWI235198B - Direct current motor type fuel pump - Google Patents

Abstract

In a direct current motor type fuel pump, the pressure of fuel is raised at the pump section (20) for output when the direct current motor of motor section (10) is driven. Said pump section (20) is fixed at the yoke (3) of the motor section (10). Said yoke (3) is provided with a first cylinder yoke (4) and a second cylinder yoke (5). In the first yoke (4), a ring-shaped magnet (2) of rare earth is disposed on the inner periphery thereof. The second yoke (5) is set on the outer periphery of the first yoke (4) at the place corresponding to said magnet (2).

Description

1235198 发明 Description of the invention: [Technical field to which the invention belongs] The present invention relates to a DC motor fuel pump that boosts fuel by driving a motor and pressurizes fuel in a fuel tank into an engine / [prior art] 7 For example, Japanese Patent Application Laid-Open No. 2002-262483 discloses a configuration of a DC motor used in a straight-flow fuel pump. " The conventional DC motor disclosed in this publication is a cylindrical yoke and a magnet which are arranged on the outer periphery of the electric cage to form a magnetic circuit in the peripheral direction. A fixing hole for fixing a magnet is formed lightly, and the fixing hole is penetrated from the inner peripheral surface to the outer peripheral surface in the thickness direction of the yoke, and is set so that the diameter of the opening formed on the outer peripheral surface is larger than that The diameter of the opening formed. The magnet is a plastic magnet formed by mixing magnetic powder and resin to form a ring. Its sister is formed as a body, and part of it is inserted into the fixing hole of the yoke. With this configuration, since a part of the magnet integrally formed with the yoke is a mouth fixing hole of the fitting 且, and the outer peripheral side of the fitting portion is larger than the inner peripheral side, the magnet will not be separated from the vehicle even after it is formed , And can be firmly fixed to the cymbal. The DC motor (namely, the motor part) used in the known DC motor fuel pump uses a fixing hole penetrating in the thickness direction of the yoke to fix the magnet to the yoke. Therefore, a through hole must be provided on the side of the yoke. Because of this, there is a problem of burrs and burrs when drilling holes. 315499 5 1235198 In addition, when the resin mixed with magnetic powder is projected on the inner peripheral side of the car, and the magnet is integrated with the car, the resin overflows from the through holes on the side of the car, causing burrs on the outer periphery of the yoke. In addition, since the magnet is located inside when viewed from the choke end portion in the axial direction, it is difficult to perform gate processing when the magnet is to be molded from the inner peripheral side of the yoke. The "injection port" means an injection port of a mold during injection molding, and a gel-like resin is injected into the mold from the injection port (that is, the injection port). The tree moon injected into the mold is held under a predetermined pressure and a predetermined temperature for a predetermined time, and the molded product is completed. At this time, since the injection port portion is also filled with resin, the resin having a solidified injection port shape (projection shape) remains. Because this part has to be removed by cutting or other methods, the removal process is called injection port treatment. Furthermore, when using a rare earth magnet that requires a strong magnetizing force and a high holding force as the magnet, the thickness of the wheel constituting the magnetic circuit must be increased. However, since the vehicle is composed of one member, the magnetizing device will be enlarged. The present invention was developed by the present invention to solve the problems of μ; +, M ^, and the above-mentioned problems. The purpose is to provide a method that does not need to be described on the side of the yoke. I. 〇 And set a bayonet hole to fix the magnet to the yoke. Bu 'uses a rare earth magnetism, and the magnetic circuit consisting of a magnet and a yoke is used to make the magnetization of the car, and the magnetization can be carried out by an air and current motor + a small magnetizing device. Motor fuel pump. [Summary of the Content] The straight-line motor-type fuel pump of the moon, with the full of the motor section 315499 6 1235198

The drive of the electric motor is referred to as V t $ A, and A is moved to the pump part fixed by the yoke of the motor part, and it will be output outside the fuel department, and the middle μ, 4 /, • The above yoke system is provided with ... The first cylindrical yoke is a ring-shaped magnet with thin cheeks arranged on the inner periphery; and the second cylindrical light is placed on the outer periphery of the j-th cylindrical light at position i3 corresponding to the position of the magnet ^^ _ . The present model does not need to be installed on the side of the vehicle to fix the penetration of the magnet. _ You soil, and when using rare earth magnets, the degree of freedom of the magnetic circuit structure composed of "magnets" yoke is called degree.乂 冋, a DC motor fuel pump that can be easily magnetized by a small magnetization device. [Embodiment] [1. Implementation Mode] The following describes the i-th embodiment of the present invention. "图 广 本A cross-sectional view of Mao Ming's first embodiment of a DC motor-type fuel pump (also referred to as a fuel pump). The fuel fruit W 0 and the pump unit 20 are configured. First, "the motor portion 10 is disposed on the inner peripheral surface of the light 3: the second system is formed into a cylindrical shape", and the peripheral surface and the outer peripheral surface of the armature 6 are separated by a predetermined distance, and the outer periphery of the armature 6 and the vehicle 3 are separated. -Form a magnetic circuit. In addition, if Sm · Fe · N Xi Cong, body + mountain steak 4. The magnet material of N (dym) is shot out of the inner peripheral surface of the yoke 3, and the target is 1 t. The magnet 3 is integrated as seen in 3, and no adhesive is required between the magnet 2 and the yoke 3. The ηth includes: 苐 苐 yoke 4 and second tubular yoke 5 which are made of carbon steel pipe for mechanical structure), and the first yoke 4 is changed from * ..., 4 to yoke 5 On the other hand, the core axis advances until it abuts on the projection 5 of the second cylindrical yoke 5 0a 〇315499 7 1235198. Further, as described later, 'from the viewpoint of the ease of magnetization, the magnet is formed by injection molding. When 2 is integrated with the first cylindrical yoke 4, it is better to magnetize the magnet 2 before pressing the first cylindrical yoke 4 into the second cylindrical yoke 5. Also, the magnet 2 is formed by injection molding. The injection port is provided on the end face of the magnet 2. At this time, from the viewpoint of the accuracy of the magnetization or the less deformation when the first cylindrical car 4 is machined, the thickness of the first cylindrical yoke 4 It is preferably 3 mm or less, and more preferably 2 mm or less. By bending both ends of the second cylindrical yoke 5 in the direction of the axis of the rotary shaft 7, the second yoke 5 is combined with the bearing housing 12, the inlet housing 21, and the outlet. The shell 23 forms one body 0 In addition to the transport part toward the rotating shaft 7, it is also possible to bend only the second cylindrical yoke axis. In this case, at the end of the other side without bending, the bearing housing 12 or the inlet housing ( The shell formed by inlet h〇USing 2l and outlet shell (〇uUet h〇using) 23 is pressed in and fixed. For example, polyacetal A ± Shiba > μ ^ Insulation of the main component of the horse The bearing housing 12 formed of resin contains a non-return 阙 η w valve 13, a bearing 8 to support the rotating shaft 7, a conductive brush 9, and a compressive brush 9 for pushing the lightning to the rectifier. The coil bobbin 10 of the sub 6a is used to supply the electric current from the pump #n to the brush 9 to the brush 9> Next, the pump section 20 will be described. The inlet M is 21 It is made of resin, and contains a shaft stopper 28, and is provided with a suction port for sucking fuel from a fuel tank (not shown). 315499 8 1235198 The outlet shell 23 is formed of resin and is provided with a shaft to support the rotating shaft 7 and an outlet 24, and at the same time, it stores the flow path 2 7 boosted fuel to the armature 6 side: the outlet port 2 4 is used to It is formed by resin and the outer periphery is formed with a D-shape of the central part of the 26) ^^ The D-notch part of the end of the shaft 7 of the chestnut wheel: there is a D-shaped cross section of the inlet 21 and the outlet 22 The plurality of wing grooves of the groove 2la form a flow path 27. a ', pump wheel 2 (following, the operation of the fuel pump will be explained. When the electric current supplied by the battery not shown is supplied from the lead 11, the brush 9, and the commutator 6a to the figure) The principle of the DC motor a 'electric hold 6 26 rotates together. The stomach shaft 7 is accompanied by a rotator shaft and a chestnut wheel. Fuel in a fuel tank (not shown) enters from the suction port and is pressurized in the flow path 27 to the back 5 of the gangster 5GGKPa and enters the space in the motor ig. The pressurized fuel cools the armature 6 when it flows between the armature 6 and the magnet 2 within the distance 10, and then, discharges from the discharge pipe of the bearing housing 12 ...: The pressurized fuel is supplied to an internal combustion engine (engine) (not shown). As described above, 轾 3 is constituted by the thicker second cylindrical yoke 5 whose i-th cylindrical surface 4 is thinner. Therefore, when using a rare-earth magnet 2 with a strong holding force, first, the rare-earth magnet 2 can be formed by injection molding on the inner peripheral surface of the i-th cylindrical tube 4 and the magnet is magnetized in this state. 2. Next, the first cylindrical vehicle 4 with the magnetic 315499 9 1235198 iron 2 formed on the inner surface is fixed to a desired position of the second cylindrical cymbal 5. In comparison with the conventional fuel pump, the use of a fuel pump 1 having a holding force weaker than that of a rare earth magnet is required. When the fuel pump 1 using a rare earth magnet 2 is used, the thickness of the vehicle 3 must be increased. On the other hand, unlike conventional DC motors, the pump unit 20 must be provided in the axial direction. Furthermore, since the boosted fuel will pass through the fuel supply, it must be liquid-tight by the second cylindrical shape (that is, the fuel will not hold the bearing seat 12, the population shell 21, and the outlet shell 23.) 2 = Compared with ordinary DC motors, the second cylindrical yoke 5 has a longer shaft length (the entire length in the axial direction). In the implementation form of Z, 'the yoke 3 is composed of the first cylindrical yoke 4 and the second cylinder. " is composed of two components, so for example, you can change the magnetic circuit only by changing the number. The length of the text-like yoke 4 is more than this. Compared to the conventional vehicles that form an integrated vehicle, the free style of the magnetic circuit is different. ::: Change the length of the first cylindrical light 4 to meet the requirements, multiple fuel pumps of ν, and multiple fuel pumps. A car 5 can also be used together again 'Because the yoke 3 series by the first] Suzuki 1 The first Γ of the first tubular car 4 and the axial length will be almost oblique to the oblique magnetic "/ two members, so it can be thin." The magnetic "becomes the second cylindrical light 5 which affects the thickness of the end. By bending and guarding the end of the second tubular vehicle 5 in the thick direction, the rotation shaft 7 can be moved toward the axis, and the assembly of the fuel pump 1 also becomes 315499 10 1235198. 0 In addition, since the magnet 2 is fixed on the inner periphery of the first cylindrical vehicle 4, the position of the magnet 2 in the fuel pump 1 can be changed by changing the first cylindrical yoke 4 to the second cylindrical yoke. 5 can be adjusted. Therefore, the magnet 2 can be fixed at a position where the product configuration in the first cylindrical yoke 4 is more convenient. In addition, the axial length of the first cylindrical yoke 4 and the magnet 2 can be made uniform. The end positions of the first cylindrical yoke 4 and the end of the magnet 2 are the same, and an injection molding injection port can be provided near the end of the i-th cylindrical yoke 4. In this case, it is not necessary to丨 The side of the cylindrical yoke 4 or from the inside of the first cylindrical yoke 4 can be easily opened by injection hole processing, and injection holes for injection molding are provided on the peripheral side. Furthermore, since the first cylindrical yoke 4 and the second cylindrical yoke 5 cooperate with each other to act as a magnetic circuit in the peripheral direction, & the selection range of the thickness of the i-th cylindrical yoke 4 and the first identical yoke 5 Wider. 2 For example, the second cylindrical yoke 5 acting as the main magnetic circuit can be thinned by adding 1 cymbal 4. The magnet 2 is used. When a strong magnetizing iron is needed, the rare-earth magnetic ith… of the sowing split buckle and the coercive force of the blade must have a thick magnetic circuit. However, because of the second yoke 4 and the second cylindrical yoke The thickness selection range of 5 is wide, so it can be said that when the soil magnet is used, the magnet 2 requires a strong magnet to thin the first cylindrical yoke 4 and has a high coercive force. 315499 11 1235198 1 After the magnet 2 inside the cylindrical yoke 4 is magnetized, a second cylindrical yoke 5 that functions as a main magnetic circuit is installed. Therefore, the magnet 2 can be magnetized using a small magnetization device. During the magnetization, the volume occupied by the first cylindrical yoke 4 which is not required is small, so the accuracy of magnetization can be improved. Here, the magnetization of the magnet will be described using FIG. 2. Fig. 2 is a diagram for explaining a state when the magnet 2 is magnetized by the magnetizing device 40 with the same magnetizing force 41. Fig. 2 (a) is the same as the embodiment, and the surface is not thin. Fig. 2 (b) shows a case where a magnet is formed on the inner periphery of the cylindrical yoke 4 as shown in a conventional manner, and a magnet 2 is formed on the inner periphery of the cylindrical yoke which is thick. In the case of FIG. 2 (a), a predetermined magnetizing force is applied by the magnetizing device 40.

The magnetization of the magnet 2 is performed. But can be good

State) ’and ca n’t fully mistake the magnetism? private

A strong magnetizing force is required when magnetizing.

When the first linear expansion ratio is selected in advance, it rises, and the contact between the first cylindrical yoke 4, the second cylindrical yoke 4, and the second cylindrical yoke 5 is also divided. 315499 12 1235198 In addition, although the fixing of the 帛 1 cylindrical yoke 4 and the second cylindrical yoke 5 is described by using a press-fit method as an example, a heat jacket or the like may be used. [Second Embodiment] Hereinafter, a second embodiment of the present invention will be described. Fig. 3 is a schematic sectional view of a magnet and a yoke of a DC motor fuel pump according to a second embodiment of the present invention. Fig. 3 is a case where the axial length of the i-th cylindrical yoke is larger than that of the second cylindrical yoke. Figure (b) shows the case where the axial length of the second cylindrical yoke is longer than that of the first cylindrical yoke. = 3 In the structure shown in Fig. ，, the end surface of the magnet 2a is in contact with the ribs provided on the inner surface of the lower end of the first cylindrical yoke 4a. This structure is used as :: the pump 1 is used to prevent the pump from being used. It is integrally formed by forming operation; 1 cylindrical yoke 4a is placed on the inner periphery or after forming! The magnet 2a in the cylindrical yoke 移动 moves downward. ^ = The structure of the second cylindrical yoke 5a is the same as that of the second cylindrical yoke 5 described in the first embodiment. The other structures not shown are the same as those in the first embodiment, so the description is omitted (hereinafter Implementation is the same). ^ In addition, when the magnet 2a is integrally formed on the i-th cylindrical yoke 4a by injection molding, when magnetized, compared with FIG. 3, the axial length of the i-th cylindrical car 4a is shorter (that is, The magnets have approximately the same axial length), so they can be easily magnetized. Especially in the case of fuel pumps, the pump section 20 must be formed in the axial direction compared to the DC motor. The length becomes longer, so the effect of 5H is more significant. In the structure shown in Figure 3, the second cylindrical yoke 5b is located at the position corresponding to the magnetic 315499 13! 235198 iron 2b (ie, in the toilet 1 cylindrical yoke serves as a large position together) and covers a part of the outer periphery of the first cylindrical yoke 4b. .: Since the above-mentioned structure is adopted, the second cylindrical vehicle 5b only needs to be arranged in the necessary area 5 'constituting the magnetic circuit, and the entire periphery of the fuel pump can be reduced. Compared with the case in Fig. 3, this ^ can be easily welded after being pressed into the cylindrical cymbal yoke 5b 'because the J cylindrical yoke is fixed and strengthened with the cylindrical yoke 2' Both. In the case of Fig. 3 (b), 筮] Bell 1 asks the yoke 4b to fix the bearing housing 12 (refer to the picture) and the inlet housing 21 (Lecod 1 Gang,. Picture). (Picture m), out of the casing 23 (refer to the i-th makeup makeup Xiao Bai Zhili) Similarly, the length of the magnet 2b in the axial direction is shorter than the first homogeneous car 4b and less than 1 a main cylinder ^ 8 + Left and right 'are arranged approximately at the center in the axial direction of the first tubular vehicle 4b. Therefore, the' magnet 2b is wrapped in a band> X m ^ and is inserted and fixed to the first cylindrical yoke 4b after forming, and the same as the conventional example A shell hole (not shown) is provided on the side of the first tubular vehicle #. From the side of the first tubular yoke 4b, a magnet 2b is integrally formed in the shell hole through the through hole. The inner periphery of the yoke 4b, this way from manufacturing

It is ideal for efficiency. Table W

[Third Embodiment] The third embodiment of the flute 1 of the present invention will be described below. Miscellaneous system of the third implementation type The second and second implementation types are separated from the station 1 aa + said, f soil ~ your modified example, any one will pull the mountain to enjoy! Mesenchymal surface

The example of the white-bowl hunting injection molding forming the magnet body on the first yoke. Figure 4 of the coin I is the third embodiment of the present invention. The DC motor fuel pump 315499 14! 235198 A schematic cross-sectional view of a tubular car. Figure 4 shows an example where the magnets are tapered. Figure 4 shows an example where the two ends of the magnet are fixed to the first car. Figure 4 shows the first car! FIG. 4 (d) is an example in which a convex portion is provided on a cylindrical vehicle end surface, and only a yoke of FIG. 4 (c) is shown. The structure of FIG. 4 (a) is formed by tapering the inner peripheral surface of the i-th cylindrical yoke 'and covering the lower end of the first cylindrical yoke 4c with a rib provided at the end of the magnet 2c, so the magnet 2c can be prevented. Move in the axial direction. The structure shown in Fig. 4 (b) is a magnet integrated with injection molding, and both ends of the m4d are covered with ribs' at both ends, so that the magnet 2d can be prevented from moving in the axial direction. The structure of FIG. 4A is provided on the upper end surface of the first cylindrical yoke 4e, and a convex shape 50e is provided as shown in FIG. 4A, and the i-th cylindrical vehicle 4e is covered with an injection-molded and integrated magnet 2e. It can prevent the magnet from moving and rotating in the axial direction. Also, the first! When the convex shape 50e of the cylindrical vehicle 4e is formed into a concave shape, the same effect can be obtained. [Fourth embodiment] Hereinafter, a fourth embodiment of the present invention will be described. The fourth implementation type is to prevent the first! Modification Example 0 of the rotation of the magnet of the fuel pump described in the third embodiment. Fig. 5 is a schematic diagram of a magnet and a bearing block of a DC motor type material pump according to the fourth embodiment of the present invention. Fig. 5 is an example of a cylinder with a cylindrical magnet: The end Φ on the opposite side of the bearing block 12 (refer to Fig. 1) is flat. Fig. 5 is a cross-sectional view of the magnet and the bearing block with the choke in Fig. 5; The example when the end face of a stellite magnet is wavy, the fifth to (g) is an example when a concave part and a convex part are provided on the iron end face 315499 15 1235198. For the convenience of explanation, Fig. 5 (b) is taken as an example to explain, 'However, like the cylindrical vehicles TA ~ 3 of the 3rd to 3rd == structure, the cylindrical ¥ 1 cylindrical vehicle It is composed of two components with the second tubular vehicle. Fig. 5 (a) shows a configuration in which the bearing housing 12f and the magnet M have flat end faces. As shown in Fig. 5 (a), both end faces of the magnet 2f are convex portions (ie, end faces on the pump portion 20 side of the 3f). A convex portion (protruded from the inner periphery protruding in the diameter direction) 50f is sandwiched between the bearing housing uf. Because the bearing block 12f contains the brushes of the DC motor (refer to the drawing), the armature 6 (refer to FIG. 丨), the bearing 8 (refer to FIG. 1), etc., and a boosted fuel discharge pipe 12a is formed ( (Refer to Article W), all of which are required for the DC motor fuel pump. Therefore, the magnet 2f can be prevented from moving and rotating in the axial direction without adding any parts. The structure of Fig. 5 (c) is formed by wavy the end faces of the bearing housing 12g and the magnet 2g, and the wavy portions are engaged with each other to prevent the magnet 2g from rotating. The structure of FIG. 5 (d) is provided with a concave portion 70h on the end surface of the bearing housing 12h, and a convex portion 60h on the end surface of the magnet 2h. By this, the concave portion and the convex portion are fastened to each other to prevent the magnet 2h. Rotation. Fig. 5 (e) is a structure in which a convex portion 61k is provided on the end surface of the bearing housing 12k, and a concave portion 71k is provided on the end surface of the magnet 2k. The concave portion and the convex portion are engaged with each other, thereby preventing the magnet 2k from rotating. The structure of FIG. 5 (f) is provided with a concave portion 72m having elasticity in the peripheral direction on the end face of the bearing seat 12 m, and a convex portion 62m is provided on the magnet 2m. These concave portions and convex portions are fastened to each other by 16 315499 1235198. This prevents rotation of the magnet 2m. The structure of Fig. 5 (g) is provided with elastic protrusions 73η provided in the bearing housing ι2η in the peripheral direction, and recesses 63n provided in the magnet 2n. The recesses and protrusions are fastened to each other to prevent the magnet 2m from rotating. Furthermore, since the recessed portion 72m in Fig. 5 (f) or the convex portion 73η in Fig. 5 (g) has elasticity, compared with the case of Fig. 5 (d) or Fig. 5), it is possible to make The magnet and the bearing seat will not loosen and engage. The reason why the recessed portion 72m of the bearing housing 12m has elasticity will be explained. The structure of the recessed part 72m of the bearing seat 12m includes: the opening for inserting the convex part 62m of the magnet & is narrower than the insertion part (trapezoidal P knife) of the convex part 62m of the magnet 2m, A pair of protrusions and a gap are placed between the protrusion and a side portion of the bearing housing 12m. Therefore, when the magnetized convex portion 62m is inserted into the concave portion 72m of the bearing housing 12m, the opening of the inserted portion is more concave than the concave portion. P 72m is narrow, so a pair of protrusions are elastically deformed on the slit side (that is, 'a state of axial elasticity') and the magnet 2m # bearing seat is positioned. 2h # # by injection molding to make magnets. Tun or magnet case, Figure 5

(d) The convex part of the magnet 2h of Fig. 5 (f) and the magnetic supply 1 I ± ^ of the magnet 2m. When used as the injection port of the molding, it is not necessary to use a yoke. It is better to handle the material. At this time, the 'injection port' is a cylindrical or angular column with a diameter or length and width of about 1 and a height of about imm. [Possibility of industrial use] According to the present invention, it is possible to realize a high degree of freedom in direct current for magnetizing a magnet by a magnetic circuit structuring device, and it is easy to use a small magnet type fuel pump. 315499 17 1235198 [Brief description of the drawings] Fig. 1 is a cross-sectional view of a DC motor fuel cell according to the first embodiment of the present invention. Fig. 2 (a) and (b) are explanatory diagrams of magnetization of a magnet. Figures 3 (a) and (b) are schematic cross-sectional views of magnets and vehicles of a DC motor fuel pump according to a second embodiment of the present invention. Figures 4 (a) to (d) are schematic cross-sectional views of a magnet and a first cylindrical yoke of a DC motor fuel pump according to a third embodiment of the present invention. Figures 5 (a) to (g) are schematic diagrams of magnets and bearing blocks of a DC motor fuel pump according to a fourth embodiment of the present invention. [Description of component symbols] DC motor fuel pumps 2, 2a, 2b, 2c, 2d, 2e, 2f, 2g, 2h, 2k, 2 3, 3f yoke 4, 4a, 4b, 4c, 4d, 4e No. 1 barrel 5 5a, 5b 2nd cylindrical choke 6 Armature 6a commutator 7 rotating shaft 8 bearing 9 brush 10 motor section 11 lead 12 > • 12f, 12g, l2h, 12k, 12m, 12n bearing block 12a discharge pipe 13 check Valve 20 Pump section 21 Inlet housing 21a, 23a Concave groove 22-23 Outlet housing 24 Outlet outlet 25 Bearing 315499 18 1235198 26 Chestnut wheel 27 Flow path 28 Rotary shaft stopper 40 Magnetizing device 40c Rib portion 41 Magnetizing force 42 Magnetic flux 50a ′ 50f, 61k, 62m, 73h, 73η convex portion 50e convex 63η, 7 1k, 72m concave 19 315499

Claims (1)

1235198 Patent application scope: 1 · A straight 'claw electric motor fuel pump, which is driven by the public and the machine, and in the above, the ... In the fixed fruit section, the "magneto-structural system is equipped with the first tube-shaped light, which is a thin area ^ week; and the second tube-shaped vehicle, which is installed on the first tube at a position corresponding to the above 1: Perimeter of the car. 2. For example, the DC of the patent application scope μ The above magnets are made by injection molding, and ’is placed on the end face of the magnet. 〃 / material mouth is set 3. For example, the DC motor-type incandescent pump of the first patent application, the end face of the above magnet is provided with a convex portion or a concave portion, and:-, other components fixed to the above vehicle The concave part or / part of the buckle is combined with the concave part and 4. The convex part of the magnet as described in item 3 of the patent application is injection-molded: a two-fuel pump, where '5 · == the first item of a DC motor fuel pump Among them, the surface of the vehicle is the same as the end surface of at least one side of the magnet. 6.H: ==== If the DC motor of the patent application range w is made by injection molding, ... pump ", The thickness is less than 3mm. The first cylindrical 辄 315499 20