JP5777728B2 - Driving device for vehicle window glass wiper device - Google Patents

Description

  The present invention relates to a drive device for a vehicle window glass wiper device according to the superordinate concept of claim 1.

BACKGROUND OF THE INVENTION A drive device for a vehicle windscreen wiper device, driven by an electric motor, is known, for example, from DE 3920731. This drive device has a transmission device (gear device), its output shaft is swingably driven to rotate, and has a worm gear driven via a worm as a transmission device element on the input side. The worm gear is connected to an output side transmission device element mounted on the output shaft of the transmission device via a crank mechanism in a torque transmitting manner. This connection is made via a coupling of a crank mechanism that is eccentrically attached to the worm gear, and the swing arm of the crank mechanism meshes with an output side transmission device mounted on the output shaft.

  A stopper device is provided to limit the swinging and rotating motion of the output shaft at the reverse position. The stopper device has a stopper portion provided on the casing side and a stopper portion coupled to the output shaft so as not to be relatively rotatable. The stopper portion coupled to the output shaft is provided on the swivel arm and is formed by a bifurcated spring body. The spring leg of the spring body surrounds an open angle in the direction of the output shaft and is connected to the swivel arm via the spring apex, the spring apex as a spring bend open towards the output shaft Is formed. Such a stopper device complicates the configuration of the drive device.

DISCLOSURE OF THE INVENTION An object of the present invention is to structurally simplify and / or improve a drive device for a vehicle window glass wiper device, in particular with respect to its integration and assembly, without functional loss.

  This problem is solved according to the invention by the features of claim 1. The dependent claims show further advantageous configurations of the invention.

  In the means according to the invention, the stopper device is arranged concentrically around the output shaft, in particular coaxial with the output shaft, in the region of the output transmission element which is non-rotatably coupled to the output shaft. ing. In particular, in connection with the configuration of the output shaft and the stopper part as a torsion spring, which is coupled to rotate together with a transmission element that is non-rotatably coupled to the output shaft, the output shaft is in the form of a loop. , Possibly used as a guide part for the central part of the wound torsion spring, to obtain the positioning of the torsion spring. The torsion spring can be defined by simple support means with respect to the rotational position relative to the output shaft as well as to the output transmission element which is non-rotatably coupled to the output shaft. Due to the position of this support means, in addition to the angular position of the spring leg in the untensioned basic position, the torsion spring can be fixed to the output transmission element, possibly with a desired preload, Thereby, the contact characteristic can be adjusted in a desired manner with respect to the stopper portion on the casing side when the output side transmission device element is rotated. This is obtained by arranging the stopper part on the casing side in a circular arc region limited by the spring legs protruding from each other with respect to the periphery of the transmission element on the output side. The contact is limited in the direction of the arc region by the support means defined by the output side transmission device element.

  By assigning according to the position, it is possible to easily avoid the tilting force to the transmission element coupled to the output shaft at the stopper position (contact position). This is because the spring leg, the stopper part on the casing side, and the support means assigned to the spring leg can be arranged with each other so that the force generated at the stopper position is preferably located in one working plane. It is.

  If the output gear element is engaged with and coupled to another swingable gear element, and another stopper device is assigned to this another gear element, it will be The drive device according to the invention with a concentrically arranged stopper device can preferably be supplemented by another stopper device. This is particularly easily possible if the further transmission element is formed as a swing arm which is received so that the swivel distance is limited. In particular, the transmission element formed as a swing arm is located in a recess on the casing side, the side wall of the recess serves as a rigid stopper, and in some cases a buffer element is arranged in front of it. Can be obtained. This stopper device, described as an additional stopper device, can also be used as an independent stopper device.

  For the corresponding turning distance limitation, the turning arm is provided with a molded part or a protruding additional part protruding toward the surface passed by the turning arm, and the stopper part on the casing side is located within the turning distance. Can also be done. For this purpose, preferably, each protrusion or each additional part can be formed by a molded part manufactured, for example, by a deep drawing method, provided on the surface passed by the swivel arm, Corresponding groove-like accommodations with stoppers on the end side are assigned.

  The use of the two stopper devices described above can ultimately reduce the local force received by the casing, which, in turn, reduces the drive device noise characteristics as well as the lighter structure of the drive device. Improvements are also obtained.

  In a driving device for a window glass wiper device of a vehicle, the stopper device for limiting the rotation angle of the output shaft driven to swing is preferably entrained in each rotation direction by an output-side transmission device coupled to the output shaft. A torsion spring is provided, and of the spring legs, the spring leg that abuts one of the stopper portions on the casing side located in the arc region between the two spring legs is rotated each time the transmission element on the output side rotates. It is obtained by turning against the direction.

  Further details of the features of the invention are set forth in the claims, the description and the drawings.

It is the figure which showed roughly the drive device for the window glass wiper apparatus of a vehicle. It is the figure which expanded and showed the part of II of FIG. It is sectional drawing along the III-III line of FIG. FIG. 3 is a plan view showing a transmission arm element in the form of a swing arm that meshes with an output-side transmission element arranged on an output shaft, together with a stopper device according to the invention. FIG. 5 shows in detail the transmission element in the form of a swing arm in FIG. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5.

  FIG. 1 schematically shows a drive device 1 for a vehicle window wiper device that is not shown in other portions. A window wiper (not shown) is connected to the output shaft 2 and moves on the window via the output shaft 2 while swinging on, for example, a windshield or a rear window.

  The output shaft 2 is driven via an output-side transmission device element 3 arranged on the output shaft 2, and this transmission device element 3 is shown as a pinion 4. It may also be formed by a transmission element, such as in the form of a gear segment, with teeth formed over only a part of the peripheral surface. Another transmission device element 5 formed as a swing arm 6 is engaged with the transmission device element 3 on the output side, and this swing arm 6 is connected to the pinion 4 via a peripheral surface region 7 provided with a tooth row. It is engaged and is pivotally supported on the shaft 8 on the side opposite to the peripheral surface region 7 where the tooth row is provided.

  The swing arm 6 is part of a crank mechanism 9 which is eccentrically pivoted to a driven transmission element, here a worm gear 11, via a coupling 10 in the form of a joint rod. The worm gear 11 meshes with a worm 12 that is driven via an electric drive motor 14 that is flange-coupled to the casing 13 of the transmission. The coupling 10 is pivotally attached to the swing arm 6 via a pin 15 fixed to the swing arm 6, and this pin 15 is opposite to the coupling 10 with respect to the swing plane of the swing arm 6. Thus, it engages with a guide track 16 provided on the bottom surface 17 of the casing. The drive-side transmission element may be formed as a spur gear.

  2 and 3 show a configuration of the stopper device 18 according to the present invention that limits the rotation angle of the output shaft 2. The stopper device 18 has a stopper part 19 that rotates with the output shaft 2 in the form of a spring element formed as a torsion spring 20. The torsion spring 20 is arranged around the output shaft 2 at the central portion 21 thereof. The legs 22, 23 of the torsion spring 20 extend from the central part 21 to the opposite sides beyond the transmission element 3 formed as the pinion 4, and in the direction opposite to the winding direction of the torsion spring 20, the pinion 4 is limited via support means 24, 25 provided on the motor. These support means 24, 25 can be formed by stepped additional portions provided on the side surface of the pinion 4 facing the torsion spring 20, or with respect to the protrusions provided on the pinion 4, the pinion 4. It can also be formed by a punched tongue piece or a stopper pin coupled to the pinion 4.

  A starting position with respect to the pinion 4 and thus with respect to the output shaft 2 is defined for the torsion spring 20 arranged around the output shaft 2 at its central part 21 via the support means 24, 25. In this starting position, the torsion spring 20 can also abut against the support means 24, 25 with a preload via the legs 22, 23. The torsion spring 20 occupies a predetermined starting position with respect to the output shaft 2 in a state in which the torsion spring 20 is in contact with the corresponding support means 24, 25 by the two spring legs 22, 23. A stopper portion 19 of the stopper device 18 that rotates together with the shaft 2 and thus the pinion 4 is formed. The stopper device 18 has one separate casing-side stopper portion 26, 27, which is disposed corresponding to each leg 22, 23, respectively. In this embodiment, these stopper portions 26 and 27 are integrally formed on the stopper element 28 on the casing side. The stopper element 28 is located on the orbit of the spring legs 22 and 23 inside the arc region 29, and this arc region 29 is limited by the spring legs 22 and 23 that abut the support means 24 and 25 with respect to the starting position. And in a corresponding manner limited by the abutment surface of the support means 24, 25 against the spring legs 22, 23.

  One of the spring legs 22 and 23 of the torsion spring 20 that rotates together with the pinion 4 in accordance with the swinging and rotating movement of the output shaft 2 and the pinion 4 is the stopper portions 26 and 27 to which the output shaft 2 and pinion 4 belong. As soon as it comes into contact with the corresponding end face, the rotational distance is limited via the stopper device 18. As a result, the abutted spring legs 22 and 23 are pushed away from the abutting position with the associated supporting means 24 and 25, and the torsion spring 20 is tensioned accordingly. This is because the other spring leg 22 or 23 maintains its position with respect to the pinion 4 or the output shaft 2 by contact with the associated support means 24 and 25 each time.

  Thus, according to the present invention, a stopper device 18 is formed which can be constructed using structurally standard members, which stopper device 18 is also subject to the preload that may occur in the case of the torsion spring 20 in the starting position. Since the properties are affected, the wiper device is spring-elastically received when entering the folded position and is assisted by the stored spring force when exiting such folded position and / or rest or stop position. . In this case, the stopper device, and therefore its stopper, is positioned relative to the spring, i.e. in this case, a small angular range before the spring tension reaches each folding and / or rest position, in particular about 10 It is advantageous if it is positioned to start in an angular range of °.

  FIG. 3 shows that the stopper element 28 on the casing side is formed by, for example, an arm protruding in a collar shape from the cover or bottom surface of the casing 13. As shown in FIG. 2, the arm enters an arc region 29 between the spring legs 22 and 23, which is supported by the support means 24 and 25. The arc region 29 is opposed to the arc region in which the spring legs 22 and 23 turn and enter when contacting the stopper portions 26 and 27 on the casing side.

  According to the present invention, the pivoting of the spring legs 22, 23, that is, the degree of displacement from the support position with respect to each support means is also limited via the support device on the casing side. Alternatively, it can be formed by a collar arm on the cover side or bottom side of the casing, which in some cases may be a support for additional buffer elements.

  FIG. 4 to FIG. 6 show that the swing distance at the turn-back position can be limited by buffering in some cases. In this case, the means shown here can be used in addition to the stopper limiting device shown in FIGS. Thus, in particular, the spring-elastically flexible stopper limiting device shown in FIGS. 2 and 3 can optionally be combined with the stopper limiting device shown in FIGS. It is also possible to achieve contact with a fixed position at the turn-back position or the stop position.

  FIG. 4 shows the positional relationship of the stopper device 31 with respect to the transmission device element 5 formed as a swing arm 6 that meshes with the transmission-side transmission device element 3 and can pivot about the shaft 8 with respect to the transmission device casing 13. Has been. A stopper 32 provided on the casing side, which is formed as a swing arm 6 and assigned to a transmission device element that swings, is formed as a buffer element 33, and the buffer element 33 is interposed via the transmission device 5. Since it is pressed and compressed toward the contact portion of the casing 13, it is finally firmly supported with respect to the casing at the end position.

  In FIG. 4, the stopper device 31 is arranged so that the swing arm 5 abuts against each buffer element 33 at the peripheral edge thereof at the turning distance between the swing arm 5 and the casing 13.

  5 and 6 show one configuration of the swing arm 6. In this configuration, the swing arm 6 is provided with a molding portion 34 that extends in the lateral direction with respect to the extending plane. This forming part can directly form the stopper part 36 which is assigned to the transmission element and rotates together, or the stopper part assigned to the transmission element is connected to the transmission element, for example by plug-in connection. Can do. A corresponding stopper portion (not shown) on each casing side can be formed by a rib disposed on the bottom surface of the casing, for example.

  In this case too, at least one of the cooperating stopper parts or both stopper parts can be formed rigidly or elastically, which gives a particularly simple construction, in particular this construction. 2 and 3 can be combined with almost no additional effort, so that the abutment force can be distributed to various transmission parts and casing areas.

Claims (10)

A drive device for a vehicle window glass wiper device, comprising transmission device elements (3, 5, 11) housed in one transmission device casing (13), wherein the transmission device elements are driven A stopper device (18) for transmitting the drive motion of the motor (14) to the output shaft (2) coupled to the output side transmission device element (3) and limiting the rotation angle of the output shaft (2). The stopper device (18) has a stopper portion (19) that rotates together with the output shaft (2), and the stopper portion (19) is a two-armed spring. is formed as an element, the spring element, the turning trajectory of Rubaneashi (22, 23) issuing collision in opposite directions, are located the stopper portion of the casing side (26, 27), the vehicle window Gala In the driving device for a wiper device,
The spring element is designed as a preparative Shon spring (20), the central portion of the torsion spring (20) (21) is arranged wound rotatably to the output shaft (2),
The spring legs (22, 23) are respectively opposite to the winding direction of the torsion spring (20) via support means (24, 25) provided on the output side transmission device element (3). A predetermined arc region (29) centered on the output shaft (2) is delimited by the two spring legs (22, 23) that are supported and abut against the support means (24, 25) at the starting position. ,
The turning trajectory of the spring legs (22, 23 ) is delimited by the stopper portions (26 , 27 ) in a direction toward the casing-side stopper portions (26, 27 ) located in the arc region (29). A drive device for a window glass wiper device of a vehicle. The output side of the transmission element (3), said output shaft (2) in which is formed by the arranged pinion (4), the driving apparatus according to claim 1. The drive unit according to claim 1 or 2 , wherein the support means (24, 25) fixed to the output shaft (2) is provided in the output side transmission element (3). The driving device according to claim 2 , wherein the supporting means (24, 25) is formed by an additional portion or a molding portion provided in the output side transmission device element (3). The stopper portion (26, 27) on the casing side is provided on a stopper element (28) positioned so as to overlap the transmission device element on the output side, and the stopper element (28) is formed on the transmission casing (13). drive of any one of a portion formed by the claims 1 to 4. A drive device for a window glass wiper device of a vehicle, which is housed in one transmission device casing (13) and transmits a drive motion of a drive motor (14) to an output shaft (2) (3) , 5, 11), and the output shaft (2) is connected to one transmission device element (3) on the output side, and the transmission device element (3) is connected to another transmission device element (3). The drive device according to any one of claims 1 to 5 , wherein a stopper device (31) is provided which meshes with 5) and which limits a rotation angle of the output shaft (2). ,
The transmission element (3) coupled to the output shaft (2) is engaged with a transmission element (5) capable of swinging and turning as another transmission element, and the transmission element (5) is turned. A drive device for a vehicle windshield wiper device, characterized in that the distance is limited by a stopper part (32) on the casing side. The drive device according to claim 6 , wherein the swingable transmission element (5) is formed by a swing arm (6). The driving device according to claim 6 or 7 , wherein the stopper portion is formed so as to buffer and / or limit the turning distance. The stopper portion protrudes transversely to the pivoting plane, it is located in the turning region of the corresponding stopper provided on the gear element that oscillates (5), any one of claims 6 to 8 The drive device described. 10. The drive device according to claim 9 , wherein the corresponding stopper is formed by a molding part provided in the transmission device element (5).

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