A car radiator fan motor structure

Abstract

The present invention discloses a motor structure for a car radiator fan, comprising a stator, a rotor, a motor housing for protecting the stator and the rotor, a magnet fixed on the inner surface of the motor housing, and a brush assembly arranged relative to the motor housing, wherein the brush assembly comprises a brush holder and a thermal fuse device mounted thereon, wherein the thermal fuse device is a straight-line self-fixing fusible inductor, comprising a graphite core rod and an enameled coil wound on the graphite core rod; both ends of the graphite core rod are provided with an inclined groove at a certain angle; the outermost turns of the enameled coil at both ends are arranged obliquely, and the inclination angle is consistent with the angle of the inclined groove at both ends of the graphite core rod, so that the graphite core rod is completely wrapped inside, the inductor fixing method is simplified, the use of glue is avoided, and the safety during fusing is improved. In addition, the present invention improves the front and rear end covers of the motor housing to prevent dust, moisture and other impurities from entering the motor, greatly improving the service life of the motor, and has very good practical value.

Description

Technical Field

[0001] The invention relates to a fan motor structure of an automobile radiator. Background Art

[0002] The car radiator fan mainly relies on the motor to drive the fan to rotate for heat dissipation. The basic working principle of the motor rotation is that the current-carrying conductor will be acted upon by force in the magnetic field. The brush holder plate inside the motor has one function to fix and install the carbon brush assembly, and another function to arrange the circuit and connect the carbon brush to the circuit. With the continuous improvement of automobile safety requirements, a thermal fuse device is required to be added to the radiator fan circuit to ensure the safety of the fan in case of emergencies. At present, the thermal fuse device used in most car radiators is a fusible inductor. This inductor uses glue to fix the enameled coil and the core rod. Not only is the fixing process complicated, but also when the fusible inductor melts at high temperature, the glue used for fixing is easy to soften and fall off, posing a safety hazard. In addition, since the car radiator fan works in the car engine compartment, it is easily affected by dust, moisture, etc. Dust entering the motor will affect the service life of components such as bearings and commutators; moisture will cause the motor to become damp and short-circuit, causing damage to the motor and other electronic components; especially the front cover of the motor, because of the heat dissipation holes, splashing mud and water can easily enter the motor through the heat dissipation holes, causing damage to its bearings, commutator, circuits, etc., seriously affecting the service life of the motor. Summary of the invention

[0003] In view of the above problems, the present invention provides a car radiator fan motor structure, improves the thermal fuse device in the radiator fan circuit, avoids the use of glue, and improves the motor housing to prevent dust and muddy water from entering the motor; thereby avoiding the risk of the fan inductor fusing and prolonging the service life of the motor. The specific technical solution is as follows:

[0004] A motor structure for a car radiator fan comprises a stator, a rotor, a motor housing protecting the stator and the rotor, a magnet fixed on the inner surface of the motor housing, and a brush assembly arranged relative to the motor housing, wherein the brush assembly comprises a brush holder and a thermal cut-off device mounted thereon, wherein the thermal cut-off device is a straight-line self-fixing fusible inductor, comprising a graphite core rod and an enameled coil wound on the graphite core rod; both ends of the graphite core rod are provided with an inclined groove with a certain angle; the outermost turns of the enameled coil at both ends are arranged inclined, and the inclination angle is consistent with the angle of the inclined groove at both ends of the graphite core rod, so that the graphite core rod is completely wrapped therein.

[0005] In the above-mentioned automobile radiator fan motor structure, the same side of the two ends of the graphite core rod is provided with a chamfer, and the inclined groove is arranged on the chamfered surface; the outermost turns of the enameled coil at both ends are arranged along the inclined groove, and the lead wires at both ends of the enameled coil are on the same straight line.

[0006] In the aforementioned automobile radiator fan motor structure, the enameled coil is composed of two sections of coils, and the two sections of coils are fixed together at the middle position of the graphite core rod by liquid metal tin.

[0007] Preferably, in the aforementioned automobile radiator fan motor structure, the straight-line self-fixing fusible inductor is fixed at a fixed position on one side of the brush holder by spot welding.

[0008] The aforementioned automobile radiator fan motor structure, the motor housing includes a casing body and a front cover body and a rear cover installed at both ends of the casing body; the front cover body is an integrally formed perfect circular structure, which includes a riveted edge for fixing the front cover body to the casing body, a main panel connecting the riveted edge and the bearing chamber, and a heat dissipation hole and auxiliary ribs arranged on the main panel, and the edge of the heat dissipation hole is provided with a water-blocking flange.

[0009] Preferably, the water-blocking flange is arranged perpendicular to the main panel, and its height is 5% to 40% of the diameter of the heat dissipation hole and is not less than 1.5 mm.

[0010] Preferably, the heat dissipation holes and auxiliary ribs are arranged at intervals along the circumferential direction on the main panel; the heat dissipation holes are circular, oval or semicircular in shape; the auxiliary ribs are long strips and radiate outward from the center of the front end cover body.

[0011] The aforementioned automobile radiator fan motor structure has a speed regulating resistor module outside the rear end cover of the motor housing, and a plurality of air holes are provided between the rear end cover and the speed regulating resistor module; the edges of the air holes are provided with outward turning edges, and the edges of the speed regulating resistor module are provided with inward turning edges.

[0012] In the aforementioned automobile radiator fan motor structure, the speed regulating resistor module is mounted on the rear end cover through a plurality of brackets, and a certain gap is left between the speed regulating resistor module and the rear end cover.

[0013] Preferably, there are four brackets, which are distributed at the edge of the speed regulating resistor module.

[0014] The beneficial effects of the present invention are:

[0015] The present invention chamfers both ends of the graphite core rod of the straight self-fixing fusible inductor as a thermal fuse device and sets an inclined groove. The outermost turns of the coils at both ends of the inductor are set obliquely along the inclined groove to completely wrap the graphite core rod inside, simplifying the fixing method of the inductor and avoiding the use of glue, thereby improving the safety during high-temperature fusing. In addition, the front and rear end covers of the motor housing are improved. The edges of the heat dissipation holes on the front cover are provided with water-blocking flanges to prevent splashing muddy water from flowing into the motor through the heat dissipation holes and prevent the motor circuit from getting damp; the edges of the air vents on the rear cover are provided with outer flanges, and the edges of the speed regulating resistor module thereon are provided with inner flanges. The two cooperate to prevent dust and other impurities from entering the motor and avoid the bearings, commutators and other components from being affected, greatly improving the service life of the motor and having very good practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the automobile radiator fan motor structure of the present invention;

[0017] Figure 2 It is a schematic diagram of the structure of the brush assembly of the present invention;

[0018] Figure 3 It is a schematic diagram of the structure of the thermal fuse device of the present invention;

[0019] Figure 4 It is a schematic diagram of the front end cover structure of the present invention;

[0020] Figure 5 It is a schematic side view of the front end cover of the present invention;

[0021] Figure 6 It is a schematic diagram of the rear end cover structure of the present invention;

[0022] Figure 7 It is a schematic side view of the rear end cover of the present invention.

[0023] In the figure: 3, motor housing; 31, housing body; 32, front cover; 321, riveted edge; 322, bearing chamber; 323, main panel; 324, heat dissipation hole; 325, auxiliary rib; 326, water-blocking flange; 33, rear cover; 5, brush assembly; 51, brush holder; 52, thermal fuse; 521, graphite core rod; 522, enameled coil; 523, inclined groove; 524, chamfered corner; 525, lead wire; 526, liquid metal tin; 6, speed control resistor module; 61, inner flange; 7, several air holes; 71, outer flange; 8, bracket. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be described clearly and completely below in conjunction with the embodiments and drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. The specific embodiments are as follows:

[0025] A motor structure for a car radiator fan comprises a stator, a rotor, a motor housing 3 for protecting the stator and the rotor, a magnet fixed to the inner surface of the motor housing 3, and a brush assembly 5 arranged relative to the motor housing 3, wherein the brush assembly 5 comprises a brush holder 51 and a thermal cut-off device 52 mounted thereon, wherein the thermal cut-off device 52 is a straight-line self-fixing fusible inductor, comprising a graphite core rod 521 and an enameled coil 522 wound on the graphite core rod 521; both ends of the graphite core rod 521 are provided with an inclined groove 523 with a certain angle; the outermost turns of the coil at both ends of the enameled coil 522 are arranged obliquely, and the inclination angle is consistent with the angle of the inclined groove 523 at both ends of the graphite core rod 521, so that the graphite core rod 521 is completely wrapped therein, thereby simplifying the fixing process of the inductor, avoiding the use of glue, and eliminating the potential safety hazard caused by high-temperature melting of glue.

[0026] In this embodiment, the straight-line self-fixing fusible inductor is fixed to a fixed position on one side of the brush holder 51 by spot welding. A chamfer 524 is provided on the same side of both ends of the graphite core rod 521, and the inclined groove 523 is arranged on the surface of the chamfer 524; the outermost turns of the enameled coil 522 are arranged along the inclined groove 523, and the leads 525 at both ends of the enameled coil 522 are on the same straight line. The enameled coil 522 is composed of two sections of coils, which are fixed together by liquid metal tin 526 in the middle position of the graphite core rod 521 to ensure automatic melting when the temperature is too high, thereby ensuring the safety of the motor.

[0027] The automobile radiator fan motor structure described in this embodiment, the motor housing 3 includes a housing body 31 and a front cover body 32 and a rear cover body 33 installed at both ends of the housing body 31; the front cover body 32 is an integrally formed perfect circular structure, which includes a riveted edge 321 for fixing the front cover body 32 on the housing body 31, a main panel 323 connecting the riveted edge 321 and the bearing chamber 322, and heat dissipation holes 324 and auxiliary ribs 325 arranged on the main panel 323, and the heat dissipation holes 324 and auxiliary ribs 325 are arranged and distributed on the main panel 323 at intervals along the circumferential direction; the shape of the heat dissipation holes 324 is circular, oval or semicircular; the auxiliary ribs 325 are long strips, which are radiated outward from the center of the front cover body 32. The edge of the heat dissipation hole 324 is provided with a water-blocking flange 326, which is arranged perpendicular to the main panel 323, and its height is 5% to 40% of the diameter of the heat dissipation hole 324 and is not less than 1.5 mm, thereby effectively preventing muddy water splashed onto the motor housing from entering the motor through the heat dissipation hole, thereby extending the service life of the motor.

[0028] In addition, in the automobile radiator fan motor structure described in this embodiment, a speed regulating resistor module 6 is provided outside the rear end cover 33 of the motor housing 3, and the speed regulating resistor module 6 is installed on the rear end cover 33 through a plurality of brackets 8, and a certain gap is left between the speed regulating resistor module 6 and the rear end cover 33. Preferably, there are four brackets 8, which are distributed at the edge of the speed regulating resistor module 6, so as to facilitate the stable installation of the speed regulating resistor module 6 without affecting the heat dissipation. A plurality of air holes 7 are provided between the rear end cover 33 and the speed regulating resistor module 6; the edge of the air hole is provided with an outer flange 71, and the edge of the speed regulating resistor module 6 is provided with an inner flange 61, and these two flanges cooperate to effectively prevent dust, impurities, moisture, etc. from entering the motor, ensure the working environment of components such as bearings and commutators, and further extend the service life of the motor.

[0029] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and scope of the elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0030] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A motor structure for a car radiator fan, comprising a stator, a rotor, a motor housing (3) for protecting the stator and the rotor, a magnet fixed to the inner surface of the motor housing (3), and a brush assembly (5) arranged relative to the motor housing (3), characterized in that: The brush assembly (5) comprises a brush holder (51) and a thermal fuse device (52) mounted thereon, the thermal fuse device (52) being a straight-line self-fixing fusible inductor, comprising a graphite core rod (521) and an enameled coil (522) wound around the graphite core rod (521); both ends of the graphite core rod (521) are provided with an inclined groove (523) with a certain angle; the outermost turns of the enameled coil (522) at both ends are arranged inclined, and the inclination angle is consistent with the angle of the inclined groove (523) at both ends of the graphite core rod (521), so that the graphite core rod (521) is completely wrapped therein; A chamfer (524) is provided on the same side of both ends of the graphite core rod (521), and the inclined groove (523) is arranged on the surface of the chamfer (524); the outermost turns of the enameled coil (522) at both ends are arranged along the inclined groove (523), and the lead wires (525) at both ends of the enameled coil (522) are on the same straight line; The motor housing (3) comprises a housing body (31) and a front cover body (32) and a rear cover body (33) mounted at both ends of the housing body (31); the front cover body (32) is an integrally formed perfect circular structure, comprising a riveted edge (321) for fixing the front cover body (32) to the housing body (31), a main panel (323) connecting the riveted edge (321) and the bearing chamber (322), and a heat dissipation hole (324) and auxiliary ribs (325) arranged on the main panel (323); the heat dissipation hole (324) is provided with a water-blocking flange (326) at the edge of the heat dissipation hole (324).

2. The automobile radiator fan motor structure according to claim 1, characterized in that: The enameled coil (522) is composed of two sections of coils, and the two sections of coils are fixed together at the middle position of the graphite core rod (521) by liquid metal tin (526).

3. The automobile radiator fan motor structure according to claim 1, characterized in that: The straight-line self-fixing fusible inductor is fixed at a fixed position on one side of the brush holder (51) by spot welding.

4. The automobile radiator fan motor structure according to claim 1, characterized in that: The water-blocking flange (326) is arranged perpendicular to the main panel (323), and its height is 5% to 40% of the diameter of the heat dissipation hole (324) and is not less than 1.5 mm.

5. The automobile radiator fan motor structure according to claim 1, characterized in that: The heat dissipation holes (324) and the auxiliary ribs (325) are arranged at intervals along the circumferential direction on the main panel (323); the heat dissipation holes (324) are circular, oval or semicircular in shape; the auxiliary ribs (325) are long strips and are radiated outwards from the center of the front cover body (32).

6. The automobile radiator fan motor structure according to claim 1, characterized in that: A speed regulating resistor module (6) is arranged outside the rear end cover (33) of the motor housing (3), and a plurality of air holes (7) are arranged between the rear end cover (33) and the speed regulating resistor module (6); the edges of the air holes are provided with outer flanges (71), and the edges of the speed regulating resistor module (6) are provided with inner flanges (61).

7. The automobile radiator fan motor structure according to claim 6, characterized in that: The speed regulating resistor module (6) is mounted on the rear end cover (33) via a plurality of brackets (8), with a certain gap being left between the speed regulating resistor module (6) and the rear end cover (33).

8. The automobile radiator fan motor structure according to claim 7, characterized in that: There are four brackets (8), which are all distributed at the edge of the speed regulating resistor module (6).

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