EP2433013A1

EP2433013A1 - Blower-shaft connection for a cooling fan of a motor vehicle and method for mounting a blower-shaft connection

Info

Publication number: EP2433013A1
Application number: EP10717118A
Authority: EP
Inventors: Julien Casagrande; Markus Liedel
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2009-05-20
Filing date: 2010-04-28
Publication date: 2012-03-28
Also published as: WO2010133428A1; DE102009003271A1; CN102439319A; BRPI1013064A2

Abstract

The invention relates to a blower-shaft connection for a cooling fan of a motor vehicle, particularly having low fan power, comprising a shaft (10), a driver (20) fastened to the shaft (10) in a rotationally fixed manner, and a blower (30) that is located on the shaft (10) and that is connected to the driver (20) in a rotationally fixed manner and thereby also fastened in a rotationally fixed manner to the shaft (10), wherein the driver (20) engages in the shaft (10) such that the driver (20) and thereby also the blower (30) are fastened in a longitudinal direction of the blower-shaft connection to the shaft (10). The invention further relates to a method for mounting a blower-shaft connection for a cooling fan of a motor vehicle, particularly having low fan power, wherein a blower (30) is plugged onto a shaft (10) and is fastened in a rotationally fixed manner to the shaft (10) by a driver (20), which is fastened to the shaft (10) in a rotationally fixed manner, wherein the driver (20) is plugged radially into a connecting region of the blower (30) to the shaft (10), wherein the driver (20) engages in the shaft (10) such that the blower (30) is fastened in a longitudinal direction of the blower-shaft connection to the shaft (10).

Description

description

title

Fan-shaft connection for a cooling fan of a motor vehicle, and method for mounting a fan-shaft connection

The invention relates to a fan-shaft connection and a method for mounting a fan-shaft connection for a cooling fan of an internal combustion engine of a motor vehicle. In this case, the cooling fan preferably has a low blower power.

State of the art

The prior art discloses a cooling fan for low-blown combustion engines, which comprises at least four components: a motor shaft providing a contour for a torque-transmitting driver and a receiving contour for a C-CNp; a fan with fan hub, which provides a contour for torque transmission and a snug fit of the fan on the motor shaft; the driver, which transmits only the torque from the shaft to the fan and serves as a spacer; and the C-CNp, which acts as a resilient, metallic

Clip is formed, which secures the fan-shaft connection against loosening and serves as an axial tolerance compensation. Higher torques are transmitted in particular by means of pressed, sintered, expensive drivers, which are designed as a three-arm, tripod or insert. Such connections require special due to the high pressure forces of the driver on the motor shaft

Machines for their assembly.

task

It is an object of the invention to provide a simple and inexpensive fan-shaft connection that can be operated manually without the assistance of Machinery can be set up and also has a small number of components. Here, the fan-shaft connection is preferably designed for low fan performance and to the requirements of the emerging markets, such as. As a simple and robust design, adapted.

Disclosure of the invention

The object of the invention is achieved by means of a fan-shaft connection for a cooling fan of a motor vehicle, according to claim 1, and by a method for mounting a fan-shaft connection for a cooling fan of a motor vehicle, according to claim 12. Advantageous developments of the invention will become apparent from the dependent claims.

In one embodiment of the invention, the fan-shaft connection comprises a shaft, a rotatably connected to the shaft driver and one on the

Shaft-mounted fan, which is non-rotatably connected to the driver and thus rotatably connected to the shaft. Here, the driver is arranged and connected to the shaft, that the driver and the fan is mounted in a longitudinal direction of the fan-shaft connection to the shaft.

In one embodiment of the assembly method according to the invention for a fan-shaft connection, a fan is first attached to a shaft and rotatably connected to the shaft by a driver which is rotatably connected to the shaft. Here, the driver is plugged into a connection region of the fan with the shaft such that the fan and the driver is supported in a longitudinal direction of the fan-shaft connection to the shaft.

The erfindungemäße fan-shaft connection has apart from an optional abutment for the fan only three components: the shaft or motor shaft, the driver and the fan. Here are the driver with the

Shaft, and the driver with the fan each prefers a positive connection, wherein there is at least one positive connection for a longitudinal direction and a radial direction in each case. Furthermore, the fan sits with no or preferably only a small radial clearance on the shaft. In embodiments of the invention, the driver engages in a fixing device in the shaft, wherein the driver is seated on a radial region of the fixing device, and thereby the driver and the fan in the longitudinal direction of the fan-shaft connection are fixed to the shaft. In particular, the radial region of the fixing device is a substantially planar or trough-shaped inner end wall of the shaft. Here, the fixing device of the shaft via the driver with a fixing device of the fan is mechanically coupled so that a torque can be transmitted by the two fixing devices.

The fixing device of the shaft or of the fan can be a torque transmission surface which extends substantially in the radial direction of the shaft or of the fan and to which in each case a torque-contact surface of the driver corresponding thereto at least in sections is seated. Preferably, the torque transmission surface of the shaft is an inner side wall of a lateral recess, in particular a lateral milled recess, in the shaft, or an inner wall of a bore, in particular a radial bore, through the shaft. The torque transmission surface of the fan is preferably a side wall of a survey, in particular a rib.

In one embodiment of the invention, the driver is designed as a clamping disk with a slot, wherein an inner side of the slot acts as a torque-bearing surface with the shaft, and an outer side of the clamping disk as a torque-bearing surface with the fan. In another embodiment of the invention, the driver is designed as a tensioning pin or a gravity pin, wherein preferably a center portion of the tensioning pin or the tensioning pin as a torque-bearing surface with the shaft and a longitudinal end portion of the tensioning pin or the tensioning pin as a torque-bearing surface the fan acts.

In embodiments of the invention, the driver can be secured against sliding down from its assembly with the shaft and the fan, by means of a snap hook or by means of two radially opposite snap hooks in the fan. Furthermore, the invention is not limited to the automotive sector, but can also be applied to other areas, such. B. heating fan or a hood can be applied. According to the invention, there is a significant cost reduction, since in comparison with the prior art, a component, namely the C-CNp, omitted, since the function of torque transfer to the fan and axial positioning of the fan on the shaft are both realized by the driver. The inventive fastening concept allows manual installation without additional aids and can therefore be used worldwide without much effort. Due to the elimination of quality-consuming sintered parts (corrosion, pore density, etc.) or the C-clip (hardness, hydrogen embrittlement, etc.), the procurement of the individual components of the fan mounting according to the invention can be located more easily.

Brief description of the figures

The invention is explained in more detail below on the basis of exemplary embodiments with reference to the attached drawing. In the drawing show:

Figure 1 is a partially sectioned side view of a first embodiment of a fan-shaft connection according to the invention. Fig. 2 is a plan view of the fan-shaft connection of Fig. 1;

3 is a top and a sectional side view of a first assembly step of the fan-shaft connection according to the invention from FIG. 1; 4 shows a beginning of a second assembly step of the fan-shaft connection of FIG. 1; Figure 5 is a continued second assembly step of the assembly of the fan-shaft connection of Fig. 4.

6 shows a conclusion of the second assembly step of the assembly of the fan-shaft connection of FIGS. 4 and 5;

Fig. 7 is a plan view of a first modification of the first embodiment of the fan-shaft connection;

Fig. 8 is a plan view of a second modification of the first embodiment of the fan-shaft connection;

9 is a plan view of a modification of a driver according to the invention of the first embodiment of the fan-shaft connection. 10 is a top and a sectional side view of a second embodiment of a fan-shaft connection according to the invention; and Fig. 1 1 in a top and a sectional side view of a modification of the second embodiment of the fan-shaft connection.

Embodiments of the invention

The embodiments of the fan-shaft connection 1 or fan attachment 1 according to the invention shown in the drawing each have - apart from a preferably designed as a ball bearing 40 abutment 40 for a fan 30 - only three components. The fan 30 with one or a plurality of fan blades 300 and a fan hub 310, which has a contact surface for transmitting torque, the so-called torque transmission surface 313, - to a fixing device 31 1 z. B. a rib 31 1 (first embodiment) or in a bore or groove (both not shown) - and possibly a special geometry -. B. a snap hook 320 - has to secure a driver 20 against its release. The driver 20 with a simple geometry to transmit the torque from a motor shaft 10 to the fan hub 310 -. B. as a clamping plate 22 (first embodiment), which is optionally curved, or as a clamping 24 or heavy-duty pin 24 (second embodiment) is formed. And further, the motor shaft 10 with a matching contour on the free longitudinal end portion 100 for mounting and mounting of the driver 20, and for torque transmission -. B. fixing 1 1 1 as a lateral recess 15 (first embodiment) or bore 1 16 (first embodiment) is formed. In the following, the term fan 30 should also include the term fan hub 310, possibly with separate fan blades 300, or vice versa.

First, the first embodiment of the invention and its modifications will be explained in more detail with reference to FIGS. 1 to 9.

A fan hub 310 according to the invention in this case has at a free end of a motor shaft 10 facing the end of a fixing device 31 1, which is designed as a rib 31 1 or a survey 31 1 of the fan hub 310 wegstehend. Two such fixing devices 31 1 are preferably provided opposite one another with respect to the motor shaft 10. These two fixing devices 31 1 preferably have mutually parallel torque transmission surfaces 313, which also extend in the longitudinal direction L of the fan-shaft connection 1 and which have a torque via the fixing device. directions 31 1 in the fan hub 310 can initiate. Preferably parallel (mounting state) to the one or more torque-transmitting surfaces 313 of the fan hub 310, the motor shaft 10 also has one or a plurality of torque transmission surfaces 1 12, which are formed by a fixing device 1 1 1 of the motor shaft 10. In the present case, these are or are this inner side walls 1 12 a (side) recess 15 or a (lateral) Einfräsung 1 15 in the motor shaft 10. If now the fan 30 is properly oriented on the motor shaft 10, so is in the connection area between the motor shaft 10th and fan 30 a specially shaped driver 20 is pushed in between such that this at least partially positive fit against the torque transmission surfaces 1 12, 313 of the motor shaft 10 and the fan 30, for which the driver 20 each torque-engaging surfaces 212, 213 has , So that the driver 20 does not slip from the motor shaft 10, it engages behind the motor shaft 10 on an inner end wall 1 18 of the fixing device 1 1 1. This inner end wall 1 18 is in the present embodiment, a planar radial region 1 18 of the

Fixing device 1 1 1.

In the first embodiment of the invention, the driver 20 is formed as a clamping plate 22, wherein the inner sides of a slot 220 in the driver 20, the torque-bearing surfaces 212 with the motor shaft 10, and two mutually parallel outer sides of the torque-bearing surfaces 213 with the Fan 30 form. Here are all torque transmitting surfaces or sides parallel to each other. Fig. 9 shows a modified driver 20, which allows easier installation. In this case, insertion bevels 232, 234 provided on the slot 220 and on the outer contour of the driver 20, on the one hand threading of the driver 20 between the torque transmission surfaces 313 of the fan hub 310 and on the other hand threading the driver 20 on the torque transmission surfaces 1 12 of the motor shaft 10 to facilitate. Of course, only a single or the insertion bevels 232 and / or only a single or the insertion bevels 234 can be realized. Furthermore, the flat clamping disc 22 may be curved in its planar extension, so that it sits with a certain axial bias between the motor shaft 10 and the fan 30.

Thus, the driver 20 is not by itself from its clamping compound with the

Motor fan 10 and the fan hub 310, the fan hub 310 has a snap hook 320, which preferably extends substantially in the radial direction R of the fan-shaft connection 1 and resilient in the longitudinal direction L. is trained. However, it is possible to provide a fixed snap hook 320 on the fan hub 310, behind which the catch 20 snaps during assembly. If the fan-shaft connection 1 is mounted, then the driver 20 is moved radially through its slot bottom and the snap hook 320 cooperating therewith, and axially through the radial region 118 of the fixing device 11

Motor shaft 10 and possibly held by the abutment 40.

The assembly process shown in more detail in FIGS. 3 to 6 is the following. First, the fan hub 310 is fitted with adapted geometry on the motor shaft 10, wherein an axial stop of the fan 30 by a dome geometry on

Fan 30 and the abutment 40 on a motor 50 (Fig. 1) is defined (Fig. 3). Subsequently, the position of the fan hub 310 is aligned on the shaft 10 to allow the mounting of the driver 20 (FIGS. 3, 4) with the snap hook 320 being urged toward the motor 50. The driver 20 is thereby positioned between the torque transmission surfaces 313 of the fan hub 310 (FIG. 4). Subsequently, an assembly of the driver 20 by moving the driver 20 to the motor shaft 10, wherein the driver 20 between the torque transmission surfaces 1 12, 313 of the motor shaft 10 and the fan 30 is positioned (Fig. 5). Following this, the driver 20 is pushed so far until the geometry for securing the position, in the present example the snap-action hooks 320, can ensure its function, ie. H. snaps back (Fig. 6). This assembly process also applies to the second embodiment of the invention.

Figs. 7 and 8 show modifications of the first embodiment of the invention. Fig. 7 shows in the mating region of the driver 20, two opposing snap hooks 320, which are preferably arranged substantially parallel to the torque transmission surfaces 313 of the fan 30. Here, the driver 20 is coming from two sides in the plug-in area between see motor shaft 10 and fan hub 310 vorbewegbar, creating a simpler

Assembly of the driver 20 is realized. 8 shows an alternative contour for transmitting torque, wherein only the insides of the slot 220 of the carrier 20 transmit the torque from the motor shaft 10 to the fan 30. In other words, when the driver 20 is mounted, the fixing device 31 1 of the fan 30 projects into the slot 220 of the driver 20. These modifications may be used in addition to or instead of the above explanations. In the following, the second embodiment of the invention and its modification will be explained in more detail with reference to FIGS. 10 and 11.

In the second embodiment of the invention, the driver 20 is a clamping pin 24 and the fixing device 1 1 1 of the motor shaft 10 has a bore 1 16, which is preferably formed as a radial bore 1 16. The fan 30 preferably has in each case as a rib 31 1 or elevation 31 1 formed and compared to the first embodiment closer stationary fixing 31 1, wherein a distance of the preferably mutually parallel torque transmission surfaces 313 of the fixing means 31 1 is substantially a diameter of Tension pin 24 and the bore 1 16 corresponds. In this case, the fixing devices 31 1 of the fan hub 310 are excluded in the region of a bore for the motor shaft 10. In an assembled state, the clamping pin 24 is inserted radially through the bore 1 16 in the motor shaft 10, held in this with its center portion and received between the two fixing devices 31 1 of the fan hub 310. In one operation of the fan 30, the torque is transmitted via the lateral bore walls (not visible in the drawing) on the dowel pin 24 and from this as in the first embodiment on the fixing means 31 1 of the fan 30 transmitted. Longitudinal

L prevents an inner end wall 1 18 of the bore 1 16 a displacement of the clamping pin 24th

In the embodiment shown in Fig. 10, the clamping pin 24 is received with a small clearance in the bore 1 16 of the motor shaft 10. In order to avoid excessive radial displacement of the tensioning pin 24 during operation of the fan 30, the fan hub 310 has snap-in hooks 320 between the fixing devices 31 1 or at the intermediate region of the fixing devices 31, which can be designed as explained above. When mounting the fan 30 on the motor shaft 10, a snap hook 320 is first pressed with properly positioned fan 30, the dowel pin 24 inserted into the bore 1 16 and pushed through to the close to the opposite snap hook 320 through the hole 1 16. The first snap hook 320 is released again and snaps back, the clamping pin 24 is radially and axially with a small clearance between the motor shaft 10 and the fan 30 is received and locks these two together. In the modification shown in Fig. 1 1 can be dispensed with the two snap hook 320, instead of a Schwerspannstift 24 is used. This has in its longitudinal direction on a spring slot 240, whereby the tensioning pin 24 is resiliently designed in its radial direction. In a relaxed state, the diameter of the tensioning pin 24 is greater than that of the bore 116. When mounting the tensioning pin 24, this is radially compressed, introduced into the bore 1 16 and then relaxes in the bore 1 16 as far as it allows. As a result, the tensioning pin 24 sits self-locking in the bore 116th

Claims

claims

1 . Fan-shaft connection for a cooling fan of a motor vehicle, in particular with low fan power, with a shaft (10), a rotationally fixed with the shaft (10) fixed carrier (20) and a on the shaft (10) seated fan (30), the rotationally fixed to the driver (20) and thereby rotatably fixed to the shaft (10), characterized in that the driver (20) engages in such a way in the shaft (10) that the driver (20) and thereby also the fan ( 30) is fixed to the shaft (10) in a longitudinal direction (L) of the fan-shaft connection (1).

2. Fan-shaft connection according to claim 1, characterized in that, apart from an optionally present abutment (40), exclusively from the shaft (10), the driver (20) and the fan (30) is constructed , and by the driver (20) preferably at least in sections, a positive connection with the shaft (10) and the fan (30) is set up.

3. fan-shaft connection according to claim 1 or 2, characterized in that the driver (20) in a fixing device (1 1 1) of the shaft (10) engages while the driver (20) at a radial region (1 18) the fixing device (1 1 1) ansitzt, whereby the driver (20) and also the fan (30) in the longitudinal direction (L) of the fan-shaft connection (1) on the shaft (10) are fixed.

4. fan shaft connection according to claim 3, characterized in that the radial region (1 18) of the fixing device (1 1 1) is a substantially planar or trough-shaped inner end wall of the motor shaft (10).

5. fan-shaft connection according to one of claims 1 to 4, characterized in that the fixing device (1 1 1) of the shaft (10) via the driver (20) with a fixing device (31 1) of the fan (30) in such a way is mechanically coupled, that by the fixing device (1 1 1) of the shaft (10) a torque on the fixing device (31 1) of the fan (30) is transferable.

6. fan-shaft connection according to one of claims 1 to 5, characterized in that the fixing device (1 1 1, 31 1) of the shaft (10) and the fan (30) is a substantially in the radial direction of the shaft ( 10) or of the fan (30) extending torque transmission surface (1 12, 313), to which in each case a thereto at least partially corresponding torque-bearing surface (212, 213) of the driver (20) ansitzt.

7. fan-shaft connection according to one of claims 1 to 6, characterized in that the torque-transmitting surface (1 12) of the shaft (10) of an inner side wall (1 12) of a lateral recess (1 15), in particular a lateral Milling (1 15), in the shaft (10), or an inner wall (1 12) of a bore (1 16), in particular a radial bore (1 16), through the shaft (10) is formed.

8. fan-shaft connection according to one of claims 1 to 7, characterized in that the torque transmission surface (313) of the fan (30) from a side wall (313) of a survey (315), in particular a rib (315), is formed.

9. fan-shaft connection according to one of claims 1 to 8, characterized in that the driver (20) as a clamping disc (22) with a slot (220) is formed, wherein an inner side of the slot (220) as a torque Contact surface (212) with the shaft (10), and an outer side of the clamping plate (22) acts as a torque-bearing surface (213) with the fan (30).

10. fan shaft connection according to one of claims 1 to 8, character- ized in that the driver (20) as a dowel pin (24) or a

Heavy-duty pin (24) is formed, wherein preferably a center portion of the clamping pin (24) or the heavy-duty pin (24) as a torque-bearing surface (212) with the shaft (10), and a longitudinal end portion of the clamping pin (24) or the heavy-duty pin (24) as a torque-bearing surface (213) with the fan (30) acts.

1 1. Fan-shaft connection according to one of claims 1 to 10, characterized in that the driver (20) against a Herhaus sliding from its association with the shaft (10) and the fan (30), by means of a snap hook (320) or by means of two Radially opposite snap hook (320) in the fan (30) is secured.

12. A method for mounting a fan-shaft connection (1) for a cooling fan of a motor vehicle, in particular with low blower power, wherein a fan (30) mounted on a shaft (10) and by a driver (20) rotatably connected to the Shaft (10) is rotatably fixed to the shaft (10), characterized in that the driver (20) is inserted radially into a connecting region of the fan (30) with the shaft (10), wherein the driver (20) engages in the shaft (10) such that the fan (30) in a longitudinal direction (L) of the

Fan shaft connection (1) is fixed to the shaft (10).