JP3560850B2 - Cable drive - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention belongs to the technical field of a cable drive device used for a window regulator of an automobile and the like.
[0002]
[Prior art]
Generally, in this type of cable driving device, for example, as in a power window mounted on a vehicle, rotation of a drum (reel) interlocked with driving of a motor causes feeding of a cable (wire) suspended around the drum, There is a type in which an operating unit connected to a window glass is moved up and down by rewinding to automatically open and close a window. As such, for example, a worm wheel that meshes with the worm gear and a damper mechanism that absorbs impact are housed and disposed in a casing facing a worm gear formed at the end of the motor shaft, and penetrated from the bottom of the casing. Because the structure was such that the drum on which the cable was suspended was connected to the projecting tip of the drive shaft, a casing for accommodating the drum was also required, and it was not allowed to have a complicated structure in which the casing was formed on the front and back, Since the power transmission path becomes longer in the axial direction and the process that is longer in the axial direction becomes a power transmission path, there is a problem that the transmission efficiency is inevitably increased and the number of parts must be increased.
On the other hand, a casing (housing, gear case) facing a worm gear formed on a motor shaft (armature shaft) is formed in a bottomed cylindrical shape with one opening, as disclosed in JP-A-1-182616. A drum on which the cable is suspended is disposed on the bottom of the worm wheel meshing with the worm gear, a damper for absorbing shock is disposed on the casing opening side of the worm wheel, and the casing opening is covered. There is a configuration in which a casing in which a drum is housed is meshed with a worm gear so that one casing accommodates necessary components.
[0003]
[Problems to be solved by the invention]
However, the conventional one is not only inferior in workability because it is necessary to incorporate the drum in a state in which a pair of cables extending from the drum penetrate a through hole formed in the casing cylinder peripheral portion, and the worm wheel, As a result of arranging the drum and the damper in a three-layer structure, the drum is thickened in the axial direction, hindering compactness, and hindering installation in a thin door. In addition, this product has a worm wheel between the damper and the drum and is spaced apart.As a result, members for connecting them are required, so that the number of parts is large, and there is a loss in power transmission. There is a problem that the efficiency is deteriorated, and there is a problem to be solved by the present invention.
[0004]
[Means for Solving the Problems]
SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances and has been made with the object of solving these problems. The invention of claim 1 has a bottomed cylindrical shape with one opening, and is interlocked with motor drive. A casing facing a rotating worm gear, a cover closing the casing opening, a worm wheel provided in the casing and meshing with the worm gear, a drum around which a cable drawn from the casing is suspended, and the worm wheel. In configuring the cable drive device with a damper that transmits the motor driving force from the to the drum in a buffer state, the damper and the drum are opposed to each other in the direction around the axis in the gap formed in the worm wheel. It is formed with the damper body and the drum tongue which fits, respectively, the casing, lead to draw the suspension wound on cable drums Guide, the casing opening side is protruded in the opened groove shape, the cover, the guide stopping portions for closing said drawer guide is a cable drive device, characterized that you have been extended form.
With this configuration, a power transmission mechanism having a worm wheel, a damper, and a cushioning function of a drum within the thickness of the worm wheel, while being of a damper type that does not require a pair of coil-type ammunition. The worm wheel, damper, and drum can be arranged close to each other to reduce the number of parts and transmit power with a power damping function within the thickness of the worm wheel. In addition to efficient power transmission , the cable can be pulled out of the casing by being inserted into the grooved pull-out guide with the cable wound on the drum, improving the workability of assembly and enabling automation. .
According to a second aspect of the present invention, in the first aspect, the damper main body is fitted and assembled from a casing opening side into a gap formed in the worm wheel, and the drum tongue piece is pivotally mounted on the fitted and assembled damper main body. A cable drive device characterized in that the cable drive device is fitted into a gap from the casing opening side so as to face in the circumferential direction. In this case, the worm wheel, the damper, and the drum can be sequentially assembled from the casing opening side, so that the assembling work can be simplified.
A third aspect of the present invention is the cable according to the first or second aspect, wherein the cover is formed with a fitting portion for loosely fitting the drum from the cable suspension side end. It is a driving device. In this case, the cable suspension portion of the drum can be arranged closer to the casing opening, the groove depth of the drawer guide can be made shallow, and the drawer guide can be closed by the cover. The sealing cost is reduced and the waterproof property is improved, and the casing can be made as shallow as possible, so that the size of the device can be reduced.
According to a fourth aspect of the present invention, in the first, second or third aspect , the casing is provided with a support shaft protruding from the bottom surface toward the casing opening side, and the worm wheel and the drum are supported on the support shaft in a freely rotatable manner. In this case, the cover is provided with a support shaft supporting portion for fittingly supporting the front end portion of the support shaft. In such a case, the worm wheel and the drum are supported by the support shafts whose both ends are supported by the casing and the cover, so that the worm wheel and the drum are surely supported.
According to a fifth aspect of the present invention, in the first, second, third, or fourth aspect , the damper is set within the thickness of the worm wheel, and the drum is disposed adjacent to the casing opening side of the worm wheel in which the damper is set. This is a cable drive device characterized by having the following configuration.
In this case, the power transmission path from the worm wheel to the drum via the damper becomes closer in the axial direction, and the power transmission efficiency is further improved.
[0005]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the present invention will be described with reference to the drawings. In the figure, reference numeral 1 denotes a drive device of a window regulator used for a power window. An armature (not shown) is provided in a bottomed cylindrical motor case (also used as a motor yoke) 2 constituting the drive device 1. Are rotatably supported, and a front bracket 3 is integrally fixed to an opening of the motor case 2. The front bracket 3 is integrally formed with a bottomed cylindrical casing 4 so as to be orthogonal to a motor shaft (armature shaft) 5a extending from the armature. A window 4b for opening a worm gear 5 engraved on the motor shaft 5a is provided on the bottom side peripheral wall 4a of the casing 4. Further, on the peripheral wall 4 a of the casing 4, lead-out guides 4 c and 4 d for pulling out a cable 9 described later are formed so as to protrude in a concave groove shape in which the opening side of the casing 4 is opened. Then, the pair of cables 9 are sent out and taken up with the driving of the motor, so that the operating member 9c connected to the cable 9 is forcibly moved up and down, whereby the window glass W is opened and closed by the driving of the motor. It has become.
[0006]
Reference numeral 6 denotes a worm wheel that meshes with the worm gear 5. The worm wheel 6 is a support shaft 4e integrally protruding from the bottom surface of the casing 4 at the axis of the casing 4 in a state of being opposed to and adjacent to the bottom surface of the casing 4. A boss 6a is rotatably supported on the boss 6a. The worm wheel 6 is composed of the boss 6a and a rim 6b formed on the outer periphery with gear teeth meshing with the worm gear. An arm 6c for connecting the rim 6b and the boss 6a has an axis. The gap 6d is interposed at a predetermined angle (120 degrees in the present embodiment) in the circumferential direction, and is surrounded by the arm 6c, the rim 6b, and the boss 6a. A plurality (n: three in this embodiment) is formed in the direction around the axis. Incidentally, the gap 6d only needs to be set so that the damper bodies 7a and 7b, which will be described later, can be fitted from the casing opening side. It may have a concave groove shape.
[0007]
Reference numeral 7 denotes a damper made of a rubbery elastic material. The number of the dampers 7 is twice the number of the gaps (2n: six in the present embodiment). And a ring-shaped connecting portion 7c for connecting the shaft core side portions of the damper bodies 7a and 7b with a predetermined gap S therebetween, and the damper bodies 7a and 7b forming a pair are connected to one gap portion. 6d. In this case, the damper bodies 7a and 7b are set so as to fit into the gaps 6d while substantially abutting the arms 6c on both sides in the axial direction constituting the gaps 6d. Incidentally, the gap between the adjacent damper bodies is adjusted by the thickness of the arm 6c. However, if the gap S is set to be the same as the thickness of the arm 6c (width in the direction around the axis of the arm 6c), all gaps are set. The gap between the damper bodies 7a and 7b becomes the same, so that there is no difference between the damper bodies 7a and 7b and the assembling property is improved. When the damper bodies 7a and 7b are fitted in the gaps 6d, the connecting portion 7c is set to fit in the concave groove 6e formed in the boss portion 6a. The worm wheel 6 is set within the thickness and does not protrude from the side surface of the casing opening of the worm wheel 6. The outer peripheral surfaces of the damper bodies 7a and 7b and the inner peripheral surface of the rim portion 6b are separated from each other to form a clearance space (expansion allowance) when the damper bodies 7a and 7b are compressed.
[0008]
Reference numeral 8 denotes a cylindrical drum, and a guide groove 8a in which a pair of cables 9 is spirally formed is formed on an outer peripheral surface of an upper half portion (casing opening side) of the drum 8, and a shaft center portion. Is formed with a fitting hole 8b which is freely rotatable with respect to the support shaft 4e. The lower surface of the lower half portion of the drum 8 (the surface facing the casing bottom surface) has a worm wheel gap 6d. The same number (n: three in the present embodiment) of tongue pieces 8c are formed so as to protrude at the same angle as the arm 6c. The drum 8 fits the fitting hole 8b into the support shaft 4e, and fits the tongue piece 8c into the gap S between the pair of damper bodies 7a, 7b fitted in the one gap 6d. It is set to be incorporated into. A cable 9 is suspended in the guide groove 8a of the drum 8 incorporated in this way, and a pair of cables 9 extending from the drum 8 is set to be fitted to the extraction guides 4c and 4d. The drum 8 is provided with holding portions 8d for locking and holding the base end of the cable 9 in a retaining shape on both end surfaces of the drum.
[0009]
Reference numeral 10 denotes a cover for closing the opening of the casing 4. The cover 10 has a guide closing portion 10a for closing the pull-out guides 4c and 4d. A support shaft support portion 10b for fitting and supporting the distal end portion of the support shaft 4a is formed in a concave groove shape. Around the support shaft support portion 10b, the drum 8 is formed in a concave groove shape so as to loosely fit the drum 8 from the casing opening side. The fitting portion 10c is formed to prevent the cable 9 from protruding.
[0010]
In the structure as described above, assembling of the cable driving device 1 involves first assembling the worm wheel 6 into the casing 4 and then assembling the damper 7 so that the damper bodies 7a and 7b forming a pair fit into the same gap 6d. Then, the drum 8 may be incorporated into the worm wheel 6 such that the tongue piece 8c fits into the gap S between the damper bodies 7a and 7b forming the pair. This is executed by fitting the suspended and extending cable 9 to the pull-out guides 4c and 4d from the casing opening side, and then closing the opening of the casing 4 with the cover 10. As a result, the assembling of the cable driving device is performed by sequentially assembling the worm wheel 6, the damper 7, the drum 8, and the cable 9 from the opening side of the casing 4, or previously suspending the cable 9 on the drum 8, 6, the damper 7, and the cable-suspended drum 8 may be sequentially assembled, and the cable 9 is wound around the drum 8 without the troublesome work of passing a cable through a through hole as in the related art. Thus, the work can be pulled out from the casing 4 to improve the workability, and automation becomes possible.
[0011]
In addition, in this structure, the damper bodies 7a and 7b, which are damper mechanisms for absorbing shock, and the drum tongue piece 8c can be configured to overlap in the thickness direction of the worm wheel 6, so that the conventional damper mechanism is provided. The casing 4 can be made thinner than that separately provided in the axial direction, which can contribute to downsizing and compactness, and facilitates storage in a thin door. In addition, since the power transmission from the worm wheel 6 to the drum 8 having a buffer function via the damper 7 is performed within the thickness of the worm wheel 6, the power transmission with reduced loss can be performed and the transmission efficiency is high. Can be. In addition, since these components are arranged close to each other, components for connecting them are unnecessary, and since the worm wheel 6 itself is also used as a member constituting a damper mechanism, the number of components can be reduced, and the structure can be reduced. Also contributes to simplification.
[0012]
In addition, since the cover 10 is formed with a fitting portion 10c for loosely fitting the drum 8 from the opening side of the casing 4, the cable suspension portion of the drum 8 is moved closer to the casing opening edge. As a result, the drawer guides 4c and 4d formed on the casing 4 can also be made shallower, and the sealing amount of the guide closing portion 10a for closing the drawer guides 4c and 4d is reduced. As a result, the casing 4 can have a shallower depth (height of the peripheral wall), and the size of the apparatus can be further reduced.
Further, the support shaft 4a for supporting the worm wheel 6 and the drum 8 is configured to be supported at both sides by the bottom surface of the casing 4 and the cover 10, so that the support of the worm wheel 6 and the drum 8 is ensured, and Can be eliminated.
In addition, while having a damper 7 for providing a buffer function, the damper 7 is housed in the worm wheel 6 so that the worm wheel 6 and the drum 8 can be arranged directly adjacent to each other, resulting in further compactness. Can be achieved, and the transmission efficiency can be improved.
[0013]
Note that the present invention is not limited to the above-described embodiment, and in short, it has a bottomed cylindrical shape with one opening, and a casing facing a worm gear that rotates in conjunction with motor driving, A cover for closing the casing opening, a worm wheel provided inside the casing and meshing with the worm gear, a drum around which a cable drawn from the casing is suspended, and transmission of motor driving force from the worm wheel to the drum. In configuring the cable drive device including a damper that is performed in a buffered state, the damper and the drum include a damper body and a drum tongue piece that are fitted in a space formed in the worm wheel so as to face each other in an axial direction. Worm wheels, drums and dampers to the casing It is not particularly limited for instructions.
[Brief description of the drawings]
FIG. 1 is a schematic diagram in which a window regulator is arranged on a door.
FIG. 2 is a partially cutaway front view of the cable driving device.
FIG. 3 is an exploded perspective view of the cable driving device.
FIG. 4 is a cross-sectional view of the cable driving device.
FIG. 5 is a front view of the worm wheel with a damper incorporated therein.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cable drive device 4 Casing 4c, 4d Extraction guide 4e Support shaft 6 Worm wheel 6c Arm portion 6d Void portion 7 Damper 7a Damper main body 8 Drum 8c Tongue piece 9 Cable 10 Cover 10a Guide blocking portion 10b Support shaft support portion 10c Fitting portion

Claims (5)

One side is a bottomed tubular shape, a casing facing a worm gear that rotates in conjunction with motor driving, a cover closing the casing opening, a worm wheel housed in the casing and meshing with the worm gear, and a casing. In configuring a cable drive device including a drum on which a cable to be drawn is suspended, and a damper for transmitting the motor driving force from the worm wheel to the drum in a buffered state, the damper and the drum include a worm. A damper main body and a drum tongue piece are formed respectively in the gap formed in the wheel so as to be opposed to each other in the direction around the axis, and a drawer guide for drawing out a cable suspended from the drum is provided in the casing. The opening side is formed to protrude in a groove shape with an opening, and a cover for closing the drawer guide is provided on the cover. There cable drive device, characterized that you have been extended form. 2. The damper body according to claim 1, wherein the damper body is fitted into the cavity formed in the worm wheel from the casing opening side, and the drum tongue piece is arranged to face the fitted damper body in an axial direction. A cable driving device that fits into a gap from an opening side. The cable drive device according to claim 1 or 2, wherein the cover has a fitting portion for loosely fitting the drum from the cable suspension side end. In claim 1, 2 or 3 , the casing is provided with a support shaft protruding from the bottom surface toward the casing opening side, and the worm wheel and the drum are supported on the support shaft so as to be freely rotatable. A cable driving device, wherein a shaft support portion for fitting and supporting a shaft tip is formed. 5. The worm wheel according to claim 1, 2, 3 or 4, wherein the damper is set within the thickness of the worm wheel, and the drum is arranged adjacent to the casing opening side of the worm wheel in which the damper is set. Cable drive device characterized by the above-mentioned.

Images