Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
  • B60S1/00—Cleaning of vehicles
  • B60S1/02—Cleaning windscreens, windows or optical devices
  • B60S1/04—Wipers or the like, e.g. scrapers
  • B60S1/32—Wipers or the like, e.g. scrapers characterised by constructional features of wiper blade arms or blades
  • B60S1/34—Wiper arms; Mountings therefor
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
  • B60S1/00—Cleaning of vehicles
  • B60S1/02—Cleaning windscreens, windows or optical devices
  • B60S1/04—Wipers or the like, e.g. scrapers
  • B60S1/32—Wipers or the like, e.g. scrapers characterised by constructional features of wiper blade arms or blades
  • B60S1/34—Wiper arms; Mountings therefor
  • B60S1/3488—Means for mounting wiper arms onto the vehicle
  • B60S1/3493—Means for mounting the wiper shaft in the wiper bearing
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
  • B60S1/00—Cleaning of vehicles
  • B60S1/02—Cleaning windscreens, windows or optical devices
  • B60S1/04—Wipers or the like, e.g. scrapers
  • B60S1/32—Wipers or the like, e.g. scrapers characterised by constructional features of wiper blade arms or blades
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16J—PISTONS; CYLINDERS; SEALINGS
  • F16J15/00—Sealings
  • F16J15/16—Sealings between relatively-moving surfaces
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16J—PISTONS; CYLINDERS; SEALINGS
  • F16J15/00—Sealings
  • F16J15/16—Sealings between relatively-moving surfaces
  • F16J15/18—Sealings between relatively-moving surfaces with stuffing-boxes for elastic or plastic packings
  • F16J15/20—Packing materials therefor
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16J—PISTONS; CYLINDERS; SEALINGS
  • F16J15/00—Sealings
  • F16J15/16—Sealings between relatively-moving surfaces
  • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings

Definitions

• the invention relates to a windshield wiper drive according to the preamble of claim 1.
• windscreen wiper drives have an output shaft with which a wiper arm is reciprocally movable back and forth.
• the output shaft is driven by an electric motor, whereby between-see types is distinguished, in which the output shaft is formed by the motor shaft of the electric motor or is fixed against rotation and designs in which the motor shaft of the electric motor via a transmission, usually a Crank or a worm gear is coupled to the output shaft.
• a transmission usually a Crank or a worm gear is coupled to the output shaft.
• the invention has for its object to propose a windshield wiper drive, the seal is fixed in position during assembly of the output shaft and with the preferred an optimized sealing effect is achieved.
• the invention has recognized that an improved grip of the seal can be ensured if the seal has a greater axial extent than known, previously used for use O-ring seals. Furthermore, the invention has recognized that an optimal hold of the seal during assembly of the output shaft is ensured if the seal has a deviating from a circular cross-sectional contour cross-sectional contour. Surprisingly, an optimal hold of the seal is ensured by the fact that the seal is not applied to a single contact surface on the drive shaft, but with two circumferential, spaced-apart in the axial direction abutment surfaces.
• the concept of the invention combines all findings and proposes a windshield wiper drive with an output shaft and a further component enclosing the output shaft before, wherein between the output shaft and the further component, a seal is arranged radially, which has two circumferential, spaced apart in the axial direction Dichtwulste, wherein each of the sealing beads radially inwardly defines an inner bearing surface with which the seal is radially inwardly supported on the output shaft.
• the inventively designed, one-piece seal has the advantage of improved handling and improved maintenance. Due to the large axial extent and deviating from a circular cross-sectional contour contour with two spaced apart in the axial direction contact surfaces not only a secure grip during assembly is ensured, but the sealing effect is surprisingly additionally improved. Thus, the sealing effect is maintained even in the event that the outer sealing bead in the axial direction due to the entry of dirt particles, road salt and dirty water is attacked and destroyed over time. The life of the seal according to the invention is therefore much higher than that of known O-ring seals, in particular because the inner sealing bead is protected longer from the dirt particles.
• the circumferential groove formed between the sealing beads is used as a grease depot and filled with lubricating grease.
• the seal has an at least approximately banana-shaped curved cross-sectional contour with rounded ends, wherein the radially inwardly bent, rounded ends each form a sealing bead and thus an inner abutment surface for supporting on the output shaft.
• the cross-sectional contour is symmetrical to a radial plane of the seal.
• the seal is given a small radial extent, as a result of which the seal is also suitable for use in low-volume seal receivers.
• the seal thus formed advantageously has a resilient action in the radial direction.
• the seal described is particularly suitable for use in protective caps having an outer diameter of about 16 mm and an inner diameter of about 12 mm, which are used in particular at a drive shaft diameter of about 10 mm.
• the seal is formed such that its radius of curvature in the unassembled state is smaller than in the mounted state.
• the Seal by the clamping receptacle between the output shaft and the other component a greater axial extent than in the unassembled state. Since the seal formed of elastic material endeavors to reach its original shape, ie its shape in the unassembled state, it presses with its inner contact surfaces radially against the output shaft, whereby a permanent seal of the region between the output shaft and the other component is ensured.
• the seal is supported on the other component not with multiple contact surfaces, but with a single contact surface, wherein the axial extent of this outer contact surface is preferably greater than one of the inner contact surfaces.
• the axial extension of the outer contact surface is at least approximately twice as large as the axial extent of one of the two inner contact surfaces, ie approximately as large as the axial extent of both, in particular identical inner contact surfaces of the seal together.
• Particularly good sealing results have been achieved if the outer contact surface arranged at radial distance from the inner contact surfaces is arranged at least in sections in a region axially between the inner contact surfaces.
• the outer abutment surface is at least partially advantageously formed by an at least approximately parallel to the groove bottom of the groove surface. This results in a symmetrical application of force to the two inner bearing surfaces spaced apart in the axial direction.
• the further component is an outer protective cap, in particular Plastic.
• the protective cap normally projects into an area outside the vehicle body and / or outside a vehicle window pane and is supported axially on the inside of a transmission housing of the windshield wiper drive.
• a trouble-free installation and a secure hold of the seal during assembly and during operation can be achieved if the seal is arranged axially between a radially inwardly facing circumferential collar of the protective cap and an annular disc.
• the seal is not or only slightly pressed in the axial direction.
• the annular disk can be, for example, a metal disk, which is preferably engaged behind by a radially inner projection of the protective cap or an annular disk made of plastic, which is preferably ultrasonically welded to the inner circumference of the protective cap.
• Embodiments are feasible in which the inner diameter of the protective cap is constant over its longitudinal extension or continuously increases in the direction of a transmission housing. It is an embodiment of the protective cap feasible, wherein the protective cap has an inner diameter step, wherein the body or the window glass of the vehicle is preferably penetrated by the portion having a smaller inner diameter and, advantageously, a smaller outer diameter. Particularly good sealing results have been achieved when the seal is supported radially outwardly on the smaller inner diameter portion of the protective cap.
• the inner diameter of the smaller inner diameter section is about 12 mm.
• a smaller seal ie a seal with a smaller outer diameter can be used. Such smaller seals are on the one hand less material intensive in the production and are also more stable and therefore more durable. Of course, seals with a smaller or a larger diameter can also be realized.
• the seal is supported radially on the outside not on a protective cap, but directly on the gear housing, in particular on a sleeve-shaped axial extension of the gear housing.
• a protective cap can advantageously be dispensed with in this embodiment if required.
• an embodiment has been found to be particularly advantageous in which the seal is received in the axial direction between an outer plastic bushing and an axially inner sintered metal disc, wherein the sintered metal disc Advantageously serves as a radial bearing for supporting the output shaft.
• FIG. 3 shows an enlarged cross-sectional profile of the seal according to FIG. 2 in the unassembled state (solid line) and in the assembled state (dashed line), it being apparent that the seal springs in the radial direction due to its shape
• Fig. 4 a section of an alternative windshield wiper drive without protective cap
• FIG. 5 shows a section of a further alternative of a windshield wiper drive with a stepped protective cap.
• a section of a windshield wiper drive 1 is shown.
• the windshield wiper drive 1 comprises an output shaft 2, which is driven in oscillation by an electric motor, not shown.
• the output shaft 2 has a circumferential knurling section 4 for fixing a wiper arm, not shown.
• the output shaft 2 protrudes from a sleeve-shaped extension 5 of a gear housing 6 and is partially enclosed by a protective cap 7 made of plastic.
• a sliding bearing 9 is pressed for the pendulum driven output shaft 2.
• the protective cap 7 has a radially inwardly facing circumferential collar 10, the inner diameter of which, in the assembled state, corresponds to the outer diameter of the output shaft 2.
• the circumferential collar 10 has a slightly smaller inner diameter than the outer diameter of the output shaft 2 in the uninstalled state and is slightly resilient in the radial direction, whereby the peripheral collar 10 rests against the output shaft 2 and thus prevents dirt, etc.
• the circumferential collar 10 has an annular step 11 for receiving a seal 12. Axially inside, the seal rests against an annular disk 13, which in this embodiment is made of plastic and is ultrasonically welded axially to the protective cap.
• the seal 12 serves to seal the output shaft 2 with respect to the protective cap 7, whereby penetration of moisture and dirt particles in a region within the protective cap 7 and thus in the transmission housing 6 is prevented.
• the seal 12 is supported radially inward on the output shaft 2 and radially on the outside of the protective cap 7, more precisely on a radially inner wall of the step 11.
• FIG. 2 The coming in the embodiment of FIG. 1 used seal 12 is shown in Fig. 2 enlarged in a sectional view.
• Fig. 3 is enlarged again in a solid line illustrated cross-sectional contour, which is reminiscent of the shape of a banana with rounded ends.
• the radially inwardly pointing ends each form a sealing bead 15, 16, wherein each sealing bead 15, 16 defines an inner bearing surface 17, 18.
• the seal 12 is supported in the assembled state radially inward on the output shaft 2 from. It can be seen that the sealing beads 16, 17 are spaced apart in the axial direction and define a circumferential groove 19 between them axially.
• the inner groove 19 is filled in the installed state with not shown grease and thus serves as a grease reservoir to optimize the sealing effect and to minimize wear and thus to extend the life of the seal 12.
• an outer bearing surface 20 With radial distance to the inner abutment surfaces 17, 18 is an outer bearing surface 20, which is located in a region axially between the sealing beads 15, 16.
• the outer contact surface 20 thus assumes a centric position with respect to the inner contact surfaces 17, 18 and has an approximately twice as large axial extent as the inner contact surfaces 17, 18.
• forces F a and F 1 which is to radially inner, radially outwardly acting in the force F a to form an outer, radially inward toward the groove 19 acting force and the forces F 1 on the inner bearing surfaces 17, 18 Forces act.
• the seal deforms 12 and takes approximately the dashed line shape with a flatter cross-sectional profile.
• the outer diameter of the cross-section profile drawn by dashed lines is at least approximately 12 mm.
• FIG. 4 an alternative embodiment of a windshield wiper drive 1 is shown.
• a protective cap is intentionally dispensed with.
• the seal 12 is supported radially on the outside directly on a sleeve-shaped extension 5 of the gear housing 6. Radially inside, the seal 12 is supported on the output shaft 2 from.
• the seal 12 between the axially outer retaining sleeve 21 made of plastic, which is received within the sleeve-shaped extension 5 made of aluminum die-cast, and a bearing bush 22 (sintered metal bushing) received, which serves as a radial bearing for the output shaft 2.
• the extension 5 may alternatively be made of plastic, zinc, magnesium or other materials.
• a plastic part 24 adjacent to the external thread 23 is pressed flush.
• the plastic part 24 is provided with a contact surface 25 which extends approximately transversely to the longitudinal extent of the output shaft 2.
• the contact surface 25 serves to support the windshield wiper drive 1 on a window pane, not shown, preferably between the window pane and the abutment surface 25 a rubber seal is received.
• a lock nut can be screwed, with which the windshield wiper drive 1 is clamped against the window, wherein also preferably between the lock nut and the window glass, a sealing rubber is added.
• FIG. 5 shows a further, alternative windshield wiper drive 1.
• the gear housing 6 on which a protective cap 7 is pushed.
• the protective cap 7 has a diameter step, wherein the seal 12 is received in a region of smaller inner diameter.
• the seal 12 is received axially between a circumferential collar 10 and an annular disc 13 made of metal, which is held by a radially inwardly facing circumferential collar 26.
• the banana-shaped cross-sectional contour of the seal 12 with its inner abutment surfaces 17, 18 and the peripheral outer abutment surface 20, with which the seal 12 is supported on the protective cap 7, can be seen in FIG.
• the output shaft 2 is mounted relative to the transmission housing 6 by means of a radial bearing (sliding bearing).
• a seal in the region of the large diameter of the protective cap 7 can be arranged.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Sealing Of Bearings (AREA)
• Sealing Devices (AREA)
• General Details Of Gearings (AREA)
• Sealing With Elastic Sealing Lips (AREA)
• Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=39651214

Family Applications (1)

Country Status (6)

Families Citing this family (2)

Citations (3)

Family Cites Families (3)

• 2007
  • 2007-06-25 DE DE102007029152A patent/DE102007029152A1/de not_active Ceased
• 2008
  • 2008-04-25 EP EP08749752A patent/EP2170661A1/de not_active Ceased
  • 2008-04-25 WO PCT/EP2008/055098 patent/WO2009000574A1/de active Application Filing
  • 2008-04-25 CN CN2008800216973A patent/CN101687492B/zh not_active Expired - Fee Related
  • 2008-04-25 BR BRPI0811923-6A2A patent/BRPI0811923A2/pt not_active IP Right Cessation
  • 2008-04-25 KR KR1020097026987A patent/KR20100023900A/ko not_active Application Discontinuation

Patent Citations (3)

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