JP2014506109A - Fan module drive unit - Google Patents

Abstract

  The fan module driving device includes an electric motor, a housing, and a vibration isolator for fixing the electric motor to the housing in an anti-vibration manner. The electric motor has a radial engagement element for engaging the elastic element, and the housing has a radial recess for receiving the elastic element. In this case, the elastic element extends so as to surround the engaging element in a part in the radial direction.

Description

  The present invention relates to a fan module driving device and a method of manufacturing such a driving device.

  For example, a fan module mounted on a car and used to carry fresh air into the car typically includes an electric motor with a fan wheel that is received in a housing. The motor is received in a housing so that vibrations are damped, and the housing is provided for incorporation into the air passage of the automobile. The acceptance that the vibrations are buffered, on the other hand, is not affected by the vibrations and shocks of the vehicle, so that the life of the motor can be increased. On the other hand, since the vibration of the electric motor is separated from the automobile, it is not an acoustically perceptible sound that makes the passengers in the automobile feel uncomfortable at other locations.

  Usually, an elastic element is arranged radially between the motor and the housing for separation. For this purpose, the housing has a recess for receiving the elastic element, while the electric motor has a device for engaging the elastic element. It is usual to form the elastic element in the form of a dumbbell in the form of two spherical parts joined together by a strip, in which case the device engages the elastic element in the region of the strip.

  When the fan module is operated at a high temperature, the elastic hardness of the elastic element is significantly reduced. As a result, the engaging element of the motor projecting in the radial direction comes into contact with the boundary surface of the recess along the circumferential direction of the motor, so that any buffering is lost. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a fan module driving device with improved punching prevention of this kind. Another object of the present invention is to provide a manufacturing method for such a fan module.

  The present invention solves this problem by a driving apparatus having the configuration of claim 1 and a manufacturing method having the configuration of claim 10.

DISCLOSURE OF THE INVENTION A fan module driving device includes an electric motor, a housing, and a vibration isolator for fixing the electric motor to the housing with vibration isolation. The electric motor has a radial engagement element for engaging the elastic element, and the housing has a radial recess for receiving the elastic element. In this case, the elastic element extends so as to surround the engaging element in a part in the radial direction.

  The special configuration of the elastic element actually prevents the engaging element from coming into contact with the boundary of the recess, even if the elasticity and the buffering force of the elastic element have been significantly reduced, for example due to aging, wear or high temperatures. This avoids impacts and thus can extend the life of the motor and prevent acoustic disturbances in the area of the drive module. By improving the safety against the collision between the engaging element and the housing, the dimension of the elastic element can be selected to be relatively fragile, resulting in fewer projections. As a result, the cushioning characteristics of the elastic element are improved both in the short and long term. Also, the structural load on the housing is reduced. Furthermore, the contact area between the elastic element and the engaging element or the recess can be increased, which can result in less material fatigue, especially of the elastic element.

  The elastic element is preferably shaped such that the elastic element spring stiffness along the direction of rotation of the motor is less than the spring stiffness in a direction parallel to the axis of rotation of the motor. Thereby, the vibration of the electric motor along the rotation direction can be preferably separated from the housing, and at the same time, the support of the electric motor in the rotation axis direction is firmly maintained. Thereby, for example, a collision between the fan wheel coupled to the electric motor and the air guide passage can be prevented.

  In order to reduce the contact area with respect to the recess in the circumferential direction of the electric motor, the elastic element has a radial pull-out portion with respect to the recess. Thereby, the heat radiating surface of the elastic element can be enlarged, and as a result, it can be improved so that heat is released from the elastic element. This measure can extend the life of the elastic element, especially during high temperature operation. By the same treatment, the spring stiffness of the elastic element in the circumferential direction of the electric motor can be reduced.

  The elastic element may be shaped such that the radially outer surface of the elastic element is curved to abut a portion of the housing. As a result, the rolling motion of the elastic element along the radial boundary surface of the recess can be reduced, so that the wear of the elastic element is reduced and the spring constant of the elastic element can be kept constant. On the other hand, the heat dissipation of the elastic element with respect to the housing of the drive device can be improved.

  In one embodiment, the elastic element is shaped such that the boundary surface in the circumferential direction of the electric motor is flush with the corresponding boundary surface of the recess. As a result, the recess can be completely filled with the shock absorber along the circumferential direction of the electric motor, so that the pretensioning force of the elastic element can be reduced or omitted. Therefore, the spring constant of the elastic element in the circumferential direction of the motor is largely possible by the selection of the material of the elastic element or the shore hardness.

  In one preferred embodiment, the engagement element includes a round metal strip that is secured to the pole pot of the motor. With this easily manufactured engagement element, sharp edges in the engagement area for the elastic element can be avoided.

  Preferably, the metal strip is headed on one side and the headed end is located between the pole pot and the back closure ring of the motor. This enables simple and low-cost manufacturing.

  Preferably, the elastic element is shaped symmetrically with respect to rotation about the radius of the motor. This avoids accidentally mounting the elastic element in an incorrect position. Auxiliary treatment aimed at poke (“avoiding inappropriate mistakes”) can be omitted in some cases, which can further reduce costs.

  In one embodiment, a cover for closing the housing in the axial direction is provided, and the elastic element is held in a shape-constrained manner in the axial direction between the boundary of the recess and the cover. In this way, the electric motor can be easily installed and removed from the housing.

  The method according to the invention for manufacturing a drive device with an engagement element in the form of a metal strip as described above comprises the steps of inserting the metal strip through a corresponding withdrawal section provided in the pole pot; Inserting the back closure ring into the pole pot; coupling the back closure ring to the pole pot; sliding the elastic element on the metal strip; and attaching the electric motor to the housing; Receiving the elastic element in the recess of the housing.

  Unlike the state-of-the-art drive device with an engaging element which is realized as the tongue of the pole pot of the motor being curved radially outwards, the drive device described above can be simply manufactured as described above. it can.

  The present invention will now be described in more detail with reference to the accompanying drawings.

Exploded view of fan module Detailed view of the motor of FIG. Vibration isolator The vibration isolator of the motor shown in FIG. Engaging element of the motor of FIG. Vibration isolator for the engagement element of FIG. Engaging element of the motor of FIG. Vibration isolator for the engagement element of FIG. Flowchart of a method for manufacturing the drive module of FIG.

Detailed Description of Embodiments FIG. 1 is a developed longitudinal sectional view of a part of a fan module 100. The fan module 100 includes a fan wheel 105 and a driving device 110. The drive device 110 includes an electric motor 115, which is received in a housing 120 with a cover 125. An elastic element 130 is provided to support the motor 115 with respect to the housing 120 or the cover 125. The elastic element 130 is usually made of plastic or rubber.

  The housing 120 is provided with a recess 135 for receiving the elastic element 130. The recess 135 is sealed upward by a cover 125 along the rotation axis 140 of the electric motor 115, and is opened radially inward. The elastic element 130 is shaped such that five surfaces abut against the boundary surface of the recess 135 and the sixth surface faces the electric motor 115 in the radial direction.

  Usually, a plurality of elastic elements 130 having appropriate recesses 135 and engaging elements 145 are distributed around the motor 115. In this case, not all the elastic elements 130 need to be at the same height with respect to the rotation axis 140 of the electric motor 115. Further, the angle between these elastic elements 130 with respect to the rotation axis 140 of the electric motor 115 may be different.

  The elastic element 130 has a pull-out portion for receiving an engagement element 145 protruding in the radial direction from the electric motor 115 in the radial direction. In the preferred embodiment, not only the radial engagement element 145 of the motor 115 engages the withdrawal portion of the elastic element 130, but at the same time, the surface of the elastic element 130 on the motor 115 side is the radial direction of the motor. Engage with the boundary. This improves the support of the electric motor 115 with respect to the housing 120 or the cover 125, so that power and vibration are transmitted substantially between the electric motor 115 and the housing 120 or the cover 125 only by the elastic element 130.

  FIG. 2 is a detailed view of the electric motor 115 of FIG. 1 in the area of the engaging element 145. Here, the engaging element 145 is formed by a substantially cylindrical or hollow cylindrical element, in particular by a steel wire. The steel wire 145 passes through a drawing portion provided in the pole pot 205 of the electric motor 115. The left end of the steel wire 145 is headed, and as a result, the diameter of the steel wire 145 is larger than the diameter of the withdrawal portion of the pole pot 205, and the steel wire 145 slides to the right on the withdrawal portion of the pole pot 205. I can't. On the left side of the heading end of the steel wire 145, a portion of the back closure ring 210 of the motor 115 is shown. The back closure ring 210 prevents the steel wire 145 from sliding into the left side and entering the motor 115.

  FIG. 3 shows an elastic element 300 corresponding to the elastic element 130 of FIG. The elastic element 300 can be used with the drive device 110 of FIG. 1, particularly in the context of the engagement element 145 illustrated in FIG. 2.

  The coordinate system represents a radial direction x, an axial direction y, and a circumferential direction z with respect to the rotation axis 140 of the electric motor 115 of FIG.

  The elastic element 300 has a drawing-out portion 305 extending in the x direction and receiving the engaging element 145 of FIGS. 1 and 2. The elastic element 300 is rotationally symmetric with respect to the withdrawal part 305. That is, when rotated 180 °, the elastic element 300 overlaps itself.

  The outer surface of the elastic element 300 in the x direction is curved according to the corresponding contact surface of the recess 135 in FIG. In this case, the bending portion has shifted to the bending portion on the boundary surface of the elastic element 300 in the z direction without a step. The boundary portion of the elastic element 300 along the y direction also corresponds to the boundary surface of the recess 135 or the cover 125.

  A plurality of side surfaces of the elastic element 300 facing in the z direction are reduced, and four round portions are formed at corners in the positive and negative y directions and the z direction. The resulting cross-section contributes to increasing the surface of the elastic element 300 and facilitates heat dissipation generated in the elastic element due to, for example, the buffering characteristics of the elastic element 300.

  FIG. 4 shows an elastic element 400 provided in the electric motor 115 of FIG. The illustration is substantially seen from the rotational axis 140 of the electric motor 115 radially outward. A coordinate system corresponding to the coordinate system of FIG. 3 makes the orientation state easy to understand. 3 differs from the embodiment of the elastic element 300 shown in FIG. 3 in that only two parts are formed along the x-axis, and these parts make the interface of the elastic element 400 in the z direction concave. It is deformed.

  FIG. 5 shows another embodiment of the engaging element 145 of the electric motor 115 of FIG. A tongue piece is punched out of the pole pot 205 of the electric motor 115 and bent outward to form an engaging element 145. In this case, the tongue piece 145 is slitted into a fork shape. This type of engagement element 145 is used in the state of the art to engage a dumbbell-shaped elastic element 130 oriented in the vertical direction.

  FIG. 6 shows an elastic element 600 that engages the tongue 145 of FIG. The coordinate system represents a radial direction x, an axial direction y, and a circumferential direction z. The outer boundary surface of the elastic element 600 is similar to the boundary portion of the elastic element 300 of FIG. However, the drawing-out portion 305 is not cylindrical, and is drawn out in a slit shape around the tongue piece 145 of FIG. On the surface of the elastic element 600 that is away from the motor 115, the transition between the slit-shaped withdrawal portion 305 and the outer boundary surface that touches the boundary of the elastic element 600 is chamfered. The chamfered portion is similar to other chamfered portions provided on the elastic element 130, but can contribute to expanding the surface of the elastic element 130 and preventing the risk of cracking in the region of sharp edges or corners. .

  FIG. 7 shows another engagement element 145 provided in the electric motor 115 of FIG. As in the case of the embodiment of FIG. 5, the tongue piece is punched from the pole pot 205 of the electric motor 115 and bent outward. In the illustrated embodiment, the side portion of the tongue is bent downward in the axial direction. Therefore, the cross section of the engagement element 145 is substantially inverted U-shaped.

  FIG. 8 shows an elastic element 800 that engages the engagement element 700 of FIG. Again, a coordinate system is shown to make the orientation state easier to understand. The view of the elastic element 800 is a view from the inside of the housing 120. The drawing-out portion 305 corresponds to the tongue piece 145 of FIG. 7 and has a substantially inverted U shape in a cross-sectional view.

  FIG. 9 is a flowchart of a method 900 for manufacturing the drive device 110 of FIG. In this case, the engagement element 145 is implemented in the form of a steel wire as described above in connection with FIG. The elastic element 130 is correspondingly formed, for example, like the elastic element 300 in FIG. 3 or the elastic element 400 in FIG.

  In the first step 905, the steel wire 145 of FIG. 2 is inserted into the corresponding drawing portion of the pole pot 205 with the surface not subjected to heading. In the next step 910, the back closure ring 210 is inserted into the pole pot 205, so that the heading surface comes into contact with the pole pot 205. Thereafter, in step 915, the back closure ring is coupled to the pole pot, preferably by bead splicing, welding or gluing. Next, the steel wire 145 is attached to the electric motor 115 in a radial direction in a shape-constrained manner and by friction.

  In the next step 920, the elastic elements 300, 400 are mounted on the steel wire 145 by sliding in the axial direction. Next, the electric motor 115 is inserted into the housing 120 together with the elastic elements 300 and 400, and the elastic elements 300 and 400 are stationary in the drawing-out portion 135 of the housing 120. Next, the cover 125 is attached to the housing 120. This preferably fixes the position of the elastic elements 300, 400 in the axial direction.

Claims (10)

A drive device (110) for the fan module (100), the drive device (110) comprising:
-An electric motor (115);
A housing (120);
-A vibration isolator (135, 300, 400, 600, 800) for vibration isolating and fixing the electric motor (115) to the housing (120);
Including
The electric motor (115) has a radial engagement element (145) for engaging the vibration isolator (135, 300, 400, 600, 800);
The housing (120) has a radial recess (135) for receiving the vibration isolator (135, 300, 400, 600, 800);
In the drive device (110),
The drive device (110), characterized in that the anti-vibration device (135, 300, 400, 600, 800) extends so as to surround the engagement element (145) in a radial part.   The spring stiffness of the vibration isolator (135, 300, 400, 600, 800) along the circumferential direction of the electric motor (115) is smaller than the spring stiffness in a direction parallel to the rotation axis of the electric motor (115). The drive device (110) according to claim 1, characterized in that the vibration isolator (135, 300, 400, 600, 800) is molded.   The vibration isolator (135, 300, 400, 600, 800) is radial with respect to the recess (135) in order to reduce the contact area with the recess (135) in the circumferential direction of the electric motor (115). The drive device (110) according to claim 1 or 2, characterized in that the drive device (110) has a pull-out portion.   Since the vibration isolator (135, 300, 400, 600, 800) abuts a part of the housing (120), the radial outer surface of the vibration isolator (135, 300, 400, 600, 800) 4. Drive device (110) according to any one of claims 1 to 3, characterized in that it is shaped to be curved.   The vibration isolator (135, 300, 400, 600, 800) is formed such that a boundary surface in the circumferential direction of the electric motor (115) is flush with a corresponding boundary surface of the recess (135). The drive device (110) according to any one of claims 1 to 4, characterized in that   The said engagement element (145) includes the round metal strip fixed to the pole pot (205) of the said electric motor (115), The one of Claim 1 to 5 characterized by the above-mentioned. Drive device (110).   The metal strip (145) is headed on one side, and the headed end is disposed between the pole pot (205) and the back closure ring (210) of the electric motor (115). The drive device (110) according to claim 6, characterized in that:   8. The vibration isolator (135, 300, 400, 600, 800) is shaped symmetrically with respect to rotation about a radius of the electric motor (115). The drive device (110) according to item.   A cover (125) for closing the housing (120) in the axial direction is provided, and the vibration isolator (135, 300, 400, 600, 800) is connected to the boundary of the recess (135) and the cover (125). Drive device (110) according to any one of the preceding claims, characterized in that it is held in a shape-constrained manner in the axial direction. A method (900) for manufacturing a drive device (110) according to claim 6,
-Inserting the metal strip (145) through a corresponding draw-out provided in the pole pot (205) (905);
-Inserting (910) the back closure ring (210) into the pole pot (205);
-Coupling (915) the back closure ring (210) to the pole pot (205);
-Sliding and mounting the vibration isolator (135, 300, 400, 600, 800) on the metal strip (145);
Inserting the motor (115) into the housing and receiving the vibration isolator (135, 300, 400, 600, 800) in the recess (135) of the housing (120) (925); ,
A method (900) comprising:

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