JP3962387B2 - Motor housing of electric motor - Google Patents

Description

  The present invention relates to a motor housing of an electric motor having a housing member and a flange surrounding a motor internal space, and the motor housing can be connected to a transmission block.

  The present invention generally relates to electronically commutated brushless DC motors and other permanent magnet motors that can be designed as inner rotor or outer rotor motors. For example, an inner rotor type motor includes a shaft, a rotor module including one or a plurality of permanent magnets disposed on the shaft, and a stator module including a stator body made of, for example, a steel plate and a phase winding. Yes. Two bearings are arranged on the shaft at axial intervals to pivotally support the rotor module relative to the stator module. In these bearings, each bearing inner ring is mounted on a shaft, and the bearing outer ring is held by a bearing carrier that is non-rotatably coupled to a motor housing or a motor flange.

  The motor is in a motor housing in the shape of a cup, which is closed at its end by a flange. The electric motor is attached to the transmission device block via a flange, and the motor shaft is pulled out from the motor housing and connected to the transmission device.

  The electric motor according to the present invention is not limited to a specific application. For example, the electric motor according to the invention can be driven via a rear transmission, for example to assist steering or to drive a cooling water pump of an automobile. And can be used as a drive motor for a blower, a machine tool, or other equipment operated by a motor.

  Regardless of the field of application, seal the motor internal space and the connection between the motor and transmission device so that foreign matter and liquid do not enter or leave the motor internal space or transmission device. There is a need. In doing so, liquids, in particular oil, flow along the interface, even when individual components such as the flange and motor housing or motor housing and transmission block are connected to each other by press fitting. You must be careful not to have any.

  In such a motor housing, the sealing part of the motor housing or the transmission device includes at least two individual flat packings or O-rings, which are between the housing member and the flange or between the housing member and the transmission device. Usually, it is inserted separately between the blocks and then sandwiched by tightening the entire module with screws or the like, so that it is elastically deformed. As a result, the motor internal space between the housing member and the flange and the space between the motor housing and the transmission device are sealed against external influences. No more intrusion into the transmission.

  Separate, separate seals can be forgotten or damaged during assembly, which leads to the motor or motor / transmission module not being sealed. In addition, significant assembly costs and costs are required to insert and fix a plurality of separate sealing materials individually.

  In the prior art, it is also known that a seal member inside the housing is vulcanized and joined to a metal housing member, and an additional separate seal member portion is attached to the outside of the housing. Vulcanization is relatively difficult and the seal material often peels again from the metal part of the motor housing.

  It is an object of the present invention to configure a motor housing of an electric motor of the kind described above so that manufacturing and assembly are simplified without impairing the sealing action.

  This problem is solved by a motor housing of an electric motor having the requirements of claim 1.

  In the motor housing according to the invention, instead of two individual flat seals or O-rings that can be lost, the housing member is advantageously added to or added to the housing member by injection molding. A single sealing material that is in close contact and is integrally formed is provided. This sealing material can be sandwiched between two opposing sealing surfaces of the flange and the transmission block. In this way, the housing member and the annular sealing material acting on both sides form a single module, and therefore, in comparison with the prior art, the housing member and two sealing materials are replaced by three components. Thus, it is only necessary to prepare a single component, that is, a housing member and a sealing material formed in close contact with the housing member. This single component is easier to manufacture, store and assemble than the separate components in the prior art. There is no risk of loss of the sealing material, and the risk of damage to the sealing material during assembly is minimal. The motor housing according to the present invention enables mass production of a housing member including an integrally formed sealing material by an automated and reliable process. In addition to reducing manufacturing and assembly costs, reliability can be improved. The integrally formed sealing material manufactured by injection molding or casting has excellent compressibility, so that tolerance of the housing member can be compensated and assembly with a small force is possible. The sealing material according to the present invention can be applied even when the outline of the housing is complicated.

  In the present invention, the sealing material has one circumferential sealing lip on each side of the housing member, and each of these sealing lips has an opposing surface forming a seal on its outer surface. The opposing surfaces are configured to cooperate with each one of the opposing sealing surfaces to form a seal. The housing member can be rotationally adjusted relative to the flange and the transmission block when in a pre-assembled state that has not yet been tightened, which requires that the transmission block, the housing member and the flange be removed from each other. Absent. This allows the three parts to be rotationally adjusted relative to one another while the sealing function of the seal is substantially maintained.

  The adhesion of the sealing portion to the housing member is such that the housing member has a notch filled with the sealing material of the sealing material on the end surface thereof, so that one seal lip is opposed to the seal lip facing this. And is preferably ensured by the establishment of at least one continuous material joint. This notch is preferably configured in the form of a through hole. Thus, necessary and sufficient fixing of the sealing material to the housing member is ensured to ensure the adhesion of the sealing material.

  In an alternative embodiment, the sealing material of the sealing material is guided around the outer edge of the housing at the end face of the housing, so that even in this way, a sealing lip is opposed to this from one sealing lip. A continuous material joint to the lip is established.

  In one advantageous embodiment, the housing member is a deep-drawn metal cup with a rotating gutter integrally formed with a sealing material. This ridge is on the end face of the metal cup that cooperates with the flange.

  The present invention also contemplates a motor and transmission unit comprising a motor housing of the type described above. A housing member having a sealing portion integrally formed between the flange and the transmission device block is sandwiched between the motor / transmission device unit.

  Hereinafter, the present invention will be described in detail using advantageous embodiments with reference to the drawings.

  FIG. 1 shows a cross-sectional view of a motor / transmission device unit according to a first embodiment of the present invention. The motor / transmission device unit includes an electric motor 10 and a transmission device block 12 which are fastened to each other by screws 14 as will be described more specifically.

  The electric motor 10 includes a shaft 16 connected to a transmission 18 in the interior space 20 of the transmission block 12 at the driven end 16 ′. The transmission device 18 is only schematically shown in FIG. 1 by a gear and a shaft. The shaft 16 passes through the motor internal space 22 surrounded by the motor housing 24. In the illustrated embodiment, the motor housing 24 is constituted by a deeply drawn metal cup having a flange 26 on the end face. The motor housing or housing cup 24 is closed by a flange 28 at the open end face.

  In the motor internal space 22, there is a stator 30 schematically illustrated as a stator body made of a steel plate. A phase winding is mounted on the stator body. The rotor 32 is non-rotatably coupled to the shaft 16 and rotates relative to the stator. The rotor 32 includes a rotor magnet 34 and a coercive element 36.

  The shaft 16 is pivotally supported by the flange 28 through the housing cup 24 via two rolling bearings 38 and 40.

  As shown in FIG. 1, the electric motor 10 is connected to the transmission device block 12 so that the housing cup 24 is sandwiched between the end face 42 of the transmission device block 12 configured in a flange shape and the flange 28 by the screw 14. Has been.

  In order to seal the motor internal space 22 and the internal space 20 of the transmission block 12, two adhesive seal members 44 and 46 are integrally formed in the housing cup 24. Since the seal member 44 is attached to the flange 26 of the housing cup 24, it is located between the flange 28 and the motor housing 24, thereby sealing both the motor inner space 22 and the transmission device inner space 20. ing. The seal material 44 is made of a seal material such as a thermoplastic elastomer, a silicon elastomer, or a PU plastic. This sealing material is added to the housing cup 24 by injection molding. The first circulating seal lip 44a closed as itself and the second circulating seal lip 44b closed as itself are formed into the housing cup. It is designed to occur on the opposite side of the 24 collars 26. The first seal lip 44 a forms a seal between the transmission block 12 and the outer surface of the housing cup 24, and the second seal lip 44 b is a seal between the housing cup 24 and the flange 28. Form.

  In order to fix the sealing material 44, the housing cup 24 is notched, preferably with a plurality of penetrations, in the area of the heel 26, allowing continuous material joining from the sealing lip 44a to the opposing sealing lip 44b. A hole 48 is provided.

  As shown in FIG. 1, in order to additionally seal the interface between the transmission block 12 and the electric motor 10, a further adhesive seal material 46 is provided. The other sealing material 46 has a configuration similar to that of the sealing material 44 and is formed by a sealing lip made of the same or similar material. However, the sealing material 46 has only one sealing lip 46b which has a sealing function on the outer surface of the housing cup 24 and is closed as such, and this sealing lip is a sealing seal facing the transmission device 12. Cooperate to form a seal with the surface. The sealing material 46 is fixed to the housing cup 24 through the through hole 50.

  The housing cup 24 in which the sealing materials 44 and 46 are integrally formed is manufactured as a pre-manufactured part before assembling the electric motor and assembling the motor / transmission device unit. Therefore, there is no need to insert a separate seal when the motor / transmission unit is assembled, and the housing cup 24 is simply sandwiched between the transmission block 12 and the flange 28 to seal these components. Done automatically.

  FIG. 2 is a cross-sectional view showing a part of a motor / transmission device unit according to an alternative embodiment of the present invention. The same parts as those in FIG. 1 are denoted by the same reference numerals and will not be described again here. The embodiment of FIG. 2 differs from the embodiment of FIG. 1 in that the sealing material 52 between the motor flange 28 and the housing cup 24 and between the housing cup 24 and the transmission block 12 is different. It is a configuration. The seal material 52 has an outer seal lip 52 a and an inner seal lip 52 b, similar to the seal material 44. The seal lips 52a and 52b have the same function as the seal lips 44a and 44b in FIG. However, in the embodiment of FIG. 2, the seal lips 52a, 52b are not joined by one or more through-holes in the housing 24, but are injection molded coatings 52c on the outer edge of the collar 26 of the motor cup 24. Are bound by. The same advantages as those in the embodiment of FIG. 1 can be obtained, but it is not necessary to provide a through hole in the housing 24 in order to fix the sealing material 52.

  The matter disclosed in the above description, the claims and the drawings, alone or in any combination, can be meaningful for configuring the present invention in various embodiments.

It is typical sectional drawing which shows the motor and transmission apparatus unit which concerns on this invention. It is typical sectional drawing which shows a part of motor / transmission apparatus unit which concerns on another embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Electric motor 12 Transmission apparatus block 14 Screw 16 Shaft 16 'Drive end part 18 Transmission apparatus 20 Transmission apparatus internal space 22 Motor internal space 24 Motor housing, housing cup 26 鍔 28 Flange 30 Stator 32 Rotor 34 Rotor magnet 36 Magnetizer 38 40 Rolling bearing 42 End face 44 Sealing material 44a, 44b Seal lip 46 Sealing material 48 Through hole 50 Through hole 52 Sealing material 52a, 52b Seal lip

Claims (8)

  A motor housing of an electric motor (10) having a housing member (24) and a flange (28) surrounding a motor internal space (22), the motor housing being connected to a transmission block (12) A sealing portion (44; 52), the sealing portion having an integral sealing material made of an injection-moldable or castable sealing material, the sealing material being The motor is formed in close contact with the housing member (24) and can be sandwiched between two opposing sealing surfaces of the flange (28) and the transmission block (12). housing.   The sealing material (44; 52) has one sealing lip (44a, 44b; 52a, 52b) on both sides of the housing member, and the sealing lip has an opposing surface for sealing. The motor housing according to claim 1, wherein the motor housing has an outer surface, and the opposing surfaces cooperate to form a seal with each one of both opposing sealing surfaces.   The housing member (24) has at least one through hole (48) filled with the sealing material of the sealing material (44), so that the one sealing lip (44a) is opposed thereto. The motor housing according to claim 2, wherein at least one continuous material joining is established to the sealing lip.   The seal material of the seal material (52) is guided around the outer edge of the housing member (24), and as a result, from one seal lip (52a) to the seal lip (52b) facing the seal lip (52b). The motor housing according to claim 2, wherein the continuous material joining (52c) is established.   The motor housing according to any one of claims 1 to 4, wherein the sealing material (44; 52) is added to the housing member by injection molding.   The said housing member (24) is a deep-drawn metal cup provided with a flange (26) on the end surface side around which the sealing material (44; 52) is integrally formed. The motor housing as described in any one of thru | or 5.   The motor / transmission device unit comprising the motor housing according to any one of claims 1 to 6, wherein the housing member (24) is provided between the flange (28) and the transmission device block (12). Motor / transmission device unit characterized by being sandwiched between the two.   At least one further sealing part (46), said another sealing part having an integral sealing material made of injection-moldable or castable sealing material, said sealing material comprising 8. The housing member (24) is formed in close contact with the housing member (24) and is sandwiched between the housing member (24) and an opposing seal surface of the transmission device block (12). The motor / transmission device unit described in 1.

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