DE8905538U1 - Mounting device for a blower motor - Google Patents

Description

Joh. Vaillant GmbH u. Co GM 790

Mounting device for a fan motor

The present invention relates to a fastening device for a blower motor on the outside of the side wall of a housing enclosing the blower by means of a bolt which passes through this side wall and a support plate supporting the motor and is each covered with a vibration-damping bush.

Such a fastening is known from GB-PS 1 203 and US-PS 3 803 690.

Such fan motor mounts are often found in gas-fired water heaters, whose burners are supported by a fan. This causes considerable transport problems when the device is transported from the manufacturer's factory to the user in a fully assembled state. The relatively heavy motor exerts considerable forces on the vibration-damping bushings, so that it has previously been necessary to provide a transport lock.
(Continue on page 2 of the original documents.)

The

The present invention is based on the object of developing the socket in such a way that transport protection is not necessary.

GB-PS 648 774 discloses a shock-absorbing bearing bush which, in a cylindrical configuration, consists of an outer and an inner cylinder wall at a distance from it. A web passes through both walls, which forms one point of contact on the bush. The other point of contact is formed by a plate carrying a hollow pin. The bush can now move when forces occur, with the inner wall of the rubber bush always being at a distance from the hollow pin, which should only be touched in exceptional cases. Due to the softness of the rubber bush, a transport lock must be provided here.

From FR-PS 1 428 341, a shock absorber with adjustable height has become known, in which a disc body with a recess is pressed into a rubber part, which cannot be described as a bushing. A bolt surrounded by a projection engages the interior of this disc body, whereby the projection can engage against inward-facing projections of the disc recess.

At least partially, the ribs are spaced from the bolt or the attachment surrounding it.

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From US-PS 2 386 463 a vibration damping device has become known in which a bolt is surrounded by an inner rib-free insert which is connected to other external bodies via star-shaped limiting surfaces.

Even with this version, special transport security cannot be avoided.

To solve the problem, the invention provides that the ribs extend parallel to the longitudinal axis of the bushings and that their apex fits snugly against the bolt head. This design provides sufficient vibration suppression, and on the other hand the fastening is so strong that transport securing is not necessary.

In an embodiment of the invention, it is proposed that the individual bolt shaft is weakened by a recess arranged between its two end regions and that the ribs only rest against these end regions, whereas the bolt shaft between these end regions has an annular distance from the apices of the ribs.

This design further reduces the vibration transmission capacity of the fastening without increasing the risk of breakage. The contact surface of the bushings is so large that

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This enables the side thrust forces exerted by the support plate to be absorbed. The fastening bolts therefore also serve to guide the support plate laterally.

The drawings illustrate an embodiment example 1 of the subject matter of the invention.

In detail,

Figure 1 a front view of the blower motor attached to the housing ,

Figure 2 shows an axial section through a bolt according to II-II of Figure 1,

Figure 3 the bolt alone in a side view.

Figure 4 is an axial section of the bushing according to IV-IV of Figure 5 and

Figure 5 shows a cross section through the socket according to V-V of Figure 4 Figure 1 shows the mounting of the fan motor 1 jj

I on the side wall 2 of the blower housing 3 by means of three j

fixing bolt 4. !

The indirect fastening of the motor 1 is provided by its support plate 5, which carries the motor 1 and can be supported against lateral movements on a lateral bearing 6 made of elastomeric material, for example silicone.

In the section according to Figure 2 and in the view according to Hgur 3,

This bolt 1 is surrounded by a bushing 7 made of elastomeric material, such as silicone, designed as shown in Figures 4 and 5, and receives the edge 9 of a recess in the bearing plate 5 in an annular groove 8. Such a bolt 4 can be riveted to the blower housing 3 in series, but could also be screwed.

A snap ring 15 that can be inserted into a groove 14 of the bolt shaft 4 secures the axial target position of the bolt 4.

% According to the invention, the inner side of the bushing 7 now carries ribs 16 (Figure 5), the apex of which rests snugly against the outer side of the thickened ends 17 and 18 of the bolt shaft 4.

The design of the bolt shaft 4 and the surrounding

The bushing 7 ensures that the bolt 4 is held solidly between the support plate 5 and the side wall 2 of the housing 3 without being able to come into direct contact with the support plate 5 and thereby cause vibration-related noise.

Claims (1)

· I · Joh. Vail 1 ant GmbH u. Co. GM 790 Expectations Fastening device for a fan motor on the outside of the side wall of a housing enclosing the fan by means of bolts passing through this side wall and a support plate supporting the motor, each encased in a vibration-damping bush and carrying ribs on its inside, characterized in that the ribs extend parallel to the longitudinal axis of the bushes (7) and that their apex fits snugly all around the oil shaft (4). Fastening device according to claim 1, characterized in that the individual bolt shaft (4) is weakened by a recess arranged between its two end regions (17, 18) and that the ribs (16) only rest against these end regions (17, 18), whereas the bolt shaft (4) has an annular distance from the apices of the ribs (16) between these end regions (17, 18).