JP2004298000A - Motor housing of motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To constitute a motor housing of a motor so as to simplify manufacturing and assembling without impairing a sealing operation. <P>SOLUTION: The motor housing of the motor (10) includes a housing member (24) and a flange (28) surrounding a motor interior space (22). The motor housing can be coupled to a transmission block (12), and has sealing parts (44; 52). The sealing part has an integral sealing material made of a sealing material which can be injection molded or cast. The sealing material is integrally molded in close contact with the housing member (24), and can be sandwiched between the facing two sealing surfaces of the flange (28) and the transmission block (12). <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a motor housing for an electric motor, having a housing member and a flange surrounding the motor interior space, the motor housing being connectable to a transmission block.

  The present invention relates generally 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 more permanent magnets disposed on the shaft, and a stator module including, for example, a stator body and a phase winding formed of a steel plate. I have. Two bearings are axially spaced on the shaft 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 connected to a motor housing or a motor flange.

  The motor is in a motor housing in the form of a cup, the housing being closed at one end by a flange. The electric motor is mounted on the transmission block via a flange, and the motor shaft is drawn out of the motor housing and connected to the transmission.

  The electric motor according to the present invention is not limited to a specific application. For example, the electric motor according to the invention is only required to be driven via a rear transmission, for example to assist steering or to drive a vehicle cooling water pump. 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 use, seal the motor internal space and the connection between the motor and the transmission so that foreign substances and liquids do not enter or exit the motor internal space or transmission. There is a need. The liquid, in particular the oil, flows along the interface, even when the individual components, such as the flange and the motor housing or the motor housing and the transmission block, are connected to each other by a press fit. We must take care that there is no such thing.

  In such a motor housing, the seal of the motor housing and the transmission 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. Usually, after being separately inserted between the block and the module, the module is sandwiched by tightening the whole module with a screw or the like and elastically deformed. Thereby, the motor internal space between the housing member and the flange, and the space between the motor housing and the transmission are sealed against external influences. No penetration into the transmission.

  Separated separate seals can be forgotten or damaged during assembly, which leads to the motor or the motor and transmission module not being sealed. Moreover, individual insertion and fixing of a plurality of separate seals requires significant assembly costs and costs.

  It is also known in the prior art to vulcanize a metal housing member with a seal inside the housing and attach an additional separate seal portion outside the housing. Vulcanization is relatively difficult, and the seal often separates again from the metal parts of the motor housing.

  It is an object of the present invention to provide a motor housing for an electric motor of the type described above in such a way that the production and assembly are simplified without compromising the sealing effect.

  This object is achieved by a motor housing of an electric motor having the features of claim 1.

  In the motor housing according to the invention, instead of two individual flat seals or O-rings which may be lost, advantageously a sealing material is added or added to the housing member by injection molding. A single sealing material is provided that is integrally molded in close contact. This sealing material can be sandwiched between two opposing sealing surfaces of the flange and the transmission block. As described above, since the housing member and the annular sealing member acting on both sides form a single module, the housing member and the two sealing members can be replaced with three components, as compared with the related art. Thus, only a single component such as a housing member and a sealing member integrally formed in close contact with the housing member may be prepared. This single component is easier to manufacture, store and assemble than multiple separate components in the prior art. There is no risk of losing the seal and the risk of damage to the seal during assembly is minimal. ADVANTAGE OF THE INVENTION The motor housing which concerns on this invention enables mass production of the housing member containing the sealing material integrally molded by the automated reliable process. In addition to reductions in manufacturing costs and assembly costs, improvements in reliability can be obtained. The integrally formed sealing material manufactured by injection molding or casting has excellent compressibility, so that the 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 housing has a complicated contour.

  In the present invention, the sealing material has one orbiting sealing lips on both sides of the housing member, and these sealing lips each have opposing surfaces forming a seal on their outer surfaces. An opposing surface is configured to cooperate with each one of the opposing sealing surfaces to form a seal. The housing member can be rotationally adjusted with respect to the flange and the transmission block when in a pre-assembled state that has not yet been tightened, so that the transmission block, the housing member and the flange need to be removed from each other. Absent. This makes it possible to adjust the rotation of these three parts relative to each other while the sealing function of the seal is substantially maintained.

  The tightness of the seal to the housing member is such that the housing member has a notch at its end face filled with the sealing material of the sealing material, so that from one sealing lip to the opposing sealing lip And that at least one continuous material joining is established. This notch is preferably formed in the form of a through hole. As a result, necessary and sufficient fixing of the sealing material to the housing member, which guarantees the adhesion of the sealing material, occurs.

  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 the sealing lip from one sealing lip faces the other. A continuous material joining to the lip is established.

  In one advantageous embodiment, the housing member is a deep-drawn metal cup provided with a peripheral flange integrally formed with the sealing material. This collar is at the end face of the metal cup cooperating with the flange.

  The 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 block is sandwiched between the motor and transmission unit.

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

  FIG. 1 is a sectional view of a motor / transmission unit according to a first embodiment of the present invention. The motor / gear unit includes an electric motor 10 and a gear block 12 fastened together by screws 14, as will be described in more detail below.

  The electric motor 10 includes a shaft 16 connected to a transmission 18 in an internal space 20 of the transmission block 12 at a driven end 16 ′. The transmission 18 is shown only schematically in FIG. 1 by gears and shafts. The shaft 16 penetrates a motor internal space 22 surrounded by a motor housing 24. In the illustrated embodiment, the motor housing 24 is formed by a deep drawn metal cup having a flange 26 on an end surface. The motor housing or housing cup 24 is closed at its open end by a flange 28.

  The motor internal space 22 has 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 connected to the shaft 16 and rotates relative to the stator. The rotor 32 includes a rotor magnet 34 and a yoke 36.

  The shaft 16 is supported by the flange 28 and 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 block 12 such that the housing cup 24 is sandwiched between the flange 28 and the end surface 42 of the transmission block 12 having a flange shape. Have been.

  In order to seal the motor internal space 22 and the internal space 20 of the transmission block 12, two adhesive seals 44 and 46 are integrally formed on the housing cup 24. Since the seal member 44 is attached to the flange 26 of the housing cup 24, the seal member 44 is located between the flange 28 and the motor housing 24, thereby sealing both the motor internal space 22 and the transmission internal space 20. ing. The sealing material 44 is made of a sealing material such as a thermoplastic elastomer, a silicone elastomer, and PU plastic. This sealing material is added to the housing cup 24 by injection molding, and a first orbiting sealing lip 44a closed as such and a second orbiting sealing lip 44b closed as such are formed into a housing cup. 24 are formed on the opposite side of the collar 26. The first seal lip 44a forms a seal between the transmission block 12 and the outer surface of the housing cup 24, and the second seal lip 44b forms a seal between the housing cup 24 and the flange 28. To form

  In order to secure the sealing material 44, the housing cup 24 has a cutout in the region of the collar 26 which allows a continuous material joining from the sealing lip 44a to the opposite sealing lip 44b, preferably a plurality of penetrations. It has a hole 48.

  As shown in FIG. 1, a further adhesive seal 46 is provided to additionally seal the interface between the transmission block 12 and the electric motor 10. The other sealing material 46 has a configuration similar to 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 rotating sealing lip 46b closed as such, which has a sealing function on the outer surface of the housing cup 24. Cooperate to form a seal with the surface. The seal member 46 is fixed to the housing cup 24 through the through hole 50.

  The housing cup 24 in which the sealing members 44 and 46 are integrally formed is manufactured as a pre-manufactured part before assembling the electric motor and assembling the motor and transmission unit. Therefore, there is no need to insert a separate sealing material when assembling the motor / transmission unit, and the sealing of these components can be achieved by simply sandwiching the housing cup 24 between the transmission block 12 and the flange 28. It is 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 components 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 seal material 52 between the motor flange 28 and the housing cup 24 and between the housing cup 24 and the transmission block 12 is formed. Configuration. The seal member 52 has an outer seal lip 52a and an inner seal lip 52b, like the seal member 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 connected by one or more through holes in the housing 24, but rather by injection molding 52c on the outer edge of the flange 26 of the motor cup 24. Are joined by Although the same advantages as in the embodiment of FIG. 1 can be obtained, it is not necessary to provide a through-hole in the housing 24 for fixing the sealing material 52.

  The matters disclosed in the above description, the claims and the drawings, alone or in any combination, may be significant for configuring the present invention in various embodiments.

It is a typical sectional view showing the motor and transmission device unit concerning the present invention. It is a typical sectional view showing a part of motor and transmission unit concerning another embodiment of the present invention.

Explanation of reference numerals

REFERENCE SIGNS LIST 10 electric motor 12 transmission block 14 screw 16 shaft 16 ′ driven end 18 transmission 20 transmission internal space 22 motor internal space 24 motor housing, housing cup 26 flange 28 flange 30 stator 32 rotor 34 rotor magnet 36 magnetizer 38 , 40 Rolling bearing 42 End face 44 Seal material 44a, 44b Seal lip 46 Seal material 48 Through hole 50 Through hole 52 Seal material 52a, 52b Seal lip

Claims (8)

  A motor housing for an electric motor (10) having a housing member (24) surrounding a motor interior space (22) and a flange (28), said motor housing being connected to a transmission block (12). Possible, comprising a seal (44; 52), said seal comprising an integral seal made of an injection moldable or castable seal material, wherein said seal is A motor which is integrally formed in close contact with the housing member (24) and can be sandwiched between two opposed 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 each side of the housing member, and the sealing lips each have an opposing surface for sealing. The motor housing according to claim 1, having an outer surface, the opposing surfaces cooperating with each one of the two opposing sealing surfaces to form a seal.   The housing member (24) has at least one through hole (48) filled with the sealing material of the sealing material (44), so that one sealing lip (44a) faces the other. 3. The motor housing according to claim 2, wherein at least one continuous material joining is made to the sealing lip (44b).   The sealing material of the sealing material (52) is guided around the outer edge of the housing member (24), so that from one sealing lip (52a) to the opposing sealing lip (52b). 3. The motor housing according to claim 2, wherein a 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 peripheral end flange (26) around which the sealing material (44; 52) is integrally formed. A motor housing according to any one of claims 1 to 5.   7. A motor and transmission unit comprising a motor housing according to any one of claims 1 to 6, wherein the housing member (24) is between the flange (28) and the transmission block (12). A motor / transmission unit that is sandwiched between   At least one further seal (46), said further seal having an integral seal of an injection moldable or castable seal material, wherein said seal material comprises: The housing member (24) is integrally molded in close contact with the housing member (24), and is sandwiched between the housing member (24) and an opposing sealing surface of the transmission block (12). The motor and transmission device unit according to 1.

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