JPH08276825A - Cable type wiper drive device - Google Patents

Abstract

PURPOSE: To reduce mounting and operating spaces by connecting first and second follower parts provided with a wiper arm in order through a pair of control cables, providing driven and drive cable mounting parts at the first follower part, and also providing a follower cable mounting part and a wiper arm at the second follower part. CONSTITUTION: A drive part 1 is provided with a crank mechanism 8 which converts the operation of first cables 2 and 3 into reciprocating operation by a motor M and a speed reducer G. Also a first follower part 4 converts the operation of the first cables 2 and 3 into the reciprocating oscillation of a first wiper arm 9, and converts into the reciprocating operation of the second cables 5 and 6. Then a second follower part 7 oscillates a second wiper arm 10 by it. Namely when one inside cable of the control cables 2 and 3 is tensed by the drive part 1 and the other one is released, one inside cable is pulled out from a follower drum and the other one is wound in it on the first follower section 4. In addition, a co-axial drive drum also synchronizes with it to alternately rotate, thus oscillating the wiper arm 10 provided at the second follower part 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable type wiper driving device. More specifically, the present invention relates to a wiper drive device in which a drive unit including a motor and a driven unit to which a wiper arm is attached are connected by a flexible control cable.

[0002]

2. Description of the Related Art In a general wiper, a drive unit equipped with a motor and a wiper arm are connected by a link rod, and a one-way rotational movement of the motor and the speed reducer is converted into a reciprocating rotational movement of the wiper arm. (For example, JP-A-58-1
(See the description of the prior art in Japanese Patent No. 01858). However, since such a link mechanism requires a large space for the operating range of each link, for example, in a small cab-over type one-box car, an instrument panel or other equipment such as a defroster nozzle, a headlamp, a glove box, etc. However, there is a problem that it is difficult to arrange the heater unit, the radiator, the ash tray, and the like. Therefore, recently, it has been proposed to arrange a flexible control cable in a loop shape as a driving element to reduce an operating space such as a link and to increase the degree of freedom in arranging a driving unit such as a motor. There is.

As such a cable type wiper driving device, for example, Japanese Patent Publication No. 63-48740 has a part of a cable stretched in a closed loop between two pulleys and an end portion of two wiper arms. , The cable is reciprocally circulated by reciprocally rotating one pulley to reciprocally oscillate the two wiper arms in a reciprocating manner. Further, this publication discloses a technique in which a pair of drums that lock the ends of the cables are relatively ratchet-coupled to form a drive pulley, and the extension of the cables is automatically absorbed. On the other hand, Japanese Patent Laid-Open No. 58-101858 discloses a cable type wiper drive device in which a control cable composed of a flexible conduit and an inner cable is arranged in a loop shape and used as a transmission element for reciprocating operation. There is. This is a crank mechanism or rack and pinion mechanism that converts the rotation of the motor into reciprocating motion of the cable, and connects the cable to the lever fixed to the shaft of each wiper arm to convert the reciprocating motion of the cable into swinging of the shaft. It is converted or converted to reciprocating rotary motion of its axis by a rack and pinion mechanism.

Japanese Unexamined Patent Publication (Kokai) No. 48-54627 discloses a part of a flexible cable arranged in a loop shape.
Disclosed is a cable-type wiper driving device which oscillates two wipers fixed to respective pulleys in synchronization with each other by sequentially winding them around individual pulleys and reciprocally circulating a loop of a cable. In this publication, a part of the loop of the cable is wound around two pulleys different from the above, which are rotatably provided on the rocking body, and the rocking body is reciprocally rocked to form the loop of the cable. A cable drive mechanism for reciprocating circulation is disclosed. Furthermore, the actual development Sho 63-19
Japanese Patent No. 9863 has a pair of pulling control cables stretched in a closed loop between two pulleys, and one pulley is reciprocally rotated by a grip of a handle.
Disclosed is a manually operated wiper drive device for a motorcycle, in which a wiper arm attached to the shaft of the other pulley is swung.

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
Since the wiper arm is directly attached to the cable in the apparatus of Japanese Patent No. 740, the range of reciprocating operation is large and a lot of space is required. Further, in the device disclosed in Japanese Patent Laid-Open No. 58-101858, each driving unit and driven unit are relatively straight, and the bending radius of the cable is large, so that the degree of freedom in wiring is low. Further, the device disclosed in Japanese Patent Publication No. 48-54627 has a problem that there is a possibility of slipping between the cable (rope) and the pulley, and the degree of freedom in wiring is small. The device disclosed in Japanese Utility Model Laid-Open No. 63-199863 can drive only one wiper. Moreover, since it is a manual operation, it cannot be applied to automobiles.

Further, since the flexible cable used in the conventional device is usually made by twisting metal wires, it is gradually stretched as the tension is repeatedly applied and released. Therefore, except for the device disclosed in Japanese Patent Publication No. 63-48740, which has a mechanism for automatically stretching and absorbing, it is necessary to adjust the tension by shortening the effective length of the cable each time during intermediate maintenance. Further, the above-mentioned conventional automatic extension absorbing mechanism requires a relatively complicated mechanism for the driving portion. Moreover, in this motor, since it is necessary to switch the rotation direction to the opposite direction every time the pulley is rotated a plurality of times, control of the rotation speed and rotation direction of the motor becomes complicated.

The present invention has been made in order to solve the above-mentioned problems of the conventional cable type wiper driving device, and the range of the space in which the parts move is minimized as much as possible, and the cable type wiper having a high degree of freedom in wiring is provided. An object of the present invention is to provide a drive device, and a drive unit and a driven unit used for the drive unit. Further, it is a technical object of the present invention to provide a cable type wiper drive device which can automatically absorb the elongation of the cable and has a simple structure, and a drive unit and a driven unit used for the drive unit.

[0008]

A cable type wiper drive device of the present invention comprises (A) a motor and a speed reducer, and a rotary drive means having an output shaft that rotates in one direction;
A drive lever fixed to the output shaft of the rotation drive means,
A drive unit having a swing plate that swings in a range of a predetermined angle according to the rotation of the drive lever, and a cable mounting bracket for mounting a pair of first control cable conduits so as to face the swing plate. ,
(B) A housing, a shaft that is rotatably supported in the housing and has a wiper arm mounting portion at one end, and a driven drum and a drive that are respectively fixed to the other end of the shaft and are housed in the housing. (C) a first driven portion having a drum, a driven cable attachment portion provided in the housing in a tangential direction of the driven drum, and a drive cable attachment portion provided in the housing in a tangential direction of the drive drum; One end side is fitted and held by the cable mounting bracket of the drive unit, and the other end side is the first
First attached to the driven cable attachment part of the driven part
The conduit and the first conduit are slidably inserted into the conduit, respectively, one end side of which is connected to a position equidistant from the rotation center of the swing plate, and the other end side of which is locked to the driven drum and reversely. A pair of first pulling control cables each of which connects the drive unit and the first driven unit, the pair of first pulling control cables consisting of a first inner cable wound in a direction, (D) a housing, and rotatably supported in the housing. A shaft having a wiper arm mounting portion at one end, a driven drum fixed to the other end of the shaft and housed in the housing, and a guide piece provided in the housing in a tangential direction of the driven drum. A second driven portion, and (E) a second conduit having one end side attached to the drive cable mounting portion of the first driven portion and the other end side attached to the driven cable mounting portion of the second driven portion, Respectively with is slidably inserted into the second conduit, one end wound is engaging in the opposite direction to the drive drum of the first driven portion, the other end side second
And a pair of second pulling control cables connecting the first driven portion and the second driven portion, the second inner cable being wound on the driven drum of the driven portion and being wound in the opposite direction. It has a feature.

In such a device, a biasing means for applying a compressive force to the conduit is interposed between at least one end of the pair of first conduits and the cable mounting bracket or housing. It is preferable that a biasing means for applying a compressive force to the conduit is interposed between the housing and at least one end of the pair of second conduits. Further, a guide piece is slidably attached to the driven cable attachment portions of the first and second housings and biased in a direction away from the housing, and the first conduit and the second conduit are fitted to the guide pieces. Those retained are preferred. Further, it is preferable that the effective diameter of the driving drum of the first driven portion is larger than the effective diameter of the driven drum of the second driven portion. When driving one wiper, the first driven portion may be omitted and the drive portion and the second driven portion may be directly connected by a pair of control cables.

The driven portion of the wiper drive device of the present invention is a cylindrical drum housing portion with a bottom, and extends concentrically outward from the bottom portion of the drum housing portion, and is attached to the front panel of the automobile around the drum housing portion. And a cylindrical bearing portion provided with a portion, and projecting outward from the side wall of the drum housing portion,
A pair of cylindrical guide piece accommodating portions each having a passage for inserting an inner cord in a tangential direction and extending in parallel to each other, and a passage for projecting outward from each side wall of the drum accommodating portion and inserting the inner cord in a tangential direction. And a housing having a pair of tubular drive cable attachment portions extending parallel to each other at an angle different from the guide piece accommodating portion, and rotatably so that both ends project into the bearing portion. The wiper arm mounting portion is provided at a portion that is housed and protrudes from the tip of the bearing portion, and the shaft having the drum mounting portion provided at the portion that protrudes into the drum housing portion is rotated together with the drum mounting portion of the shaft. A drive drum and a driven drum having a spiral cable guide groove fixed to the periphery thereof and locking portions for locking the inner cable at both ends of the cable guide groove. And a guide piece slidably inserted into the guide piece accommodating portion, having a portion for fitting and holding a conduit of a pull control cable at one end, and having a passage for inserting an inner cable, and And a spring for elastically urging the guide piece in a direction away from the housing. In such a driven portion, the passages through which the inner cords of the guide piece accommodating portion and the drive cable attachment portion are inserted traverse the side wall of the drum accommodating portion with a size that allows the inner cords to pass, and communicate with the opening side. Those are preferable.

The second driven portion of the wiper drive device of the present invention
According to this aspect, a cylindrical drum housing having a bottom and a cylindrical bearing that is concentrically outwardly extended from the bottom of the drum housing and is provided with a mounting portion to the front panel of the automobile is provided around the drum housing. And a bearing having a pair of tubular guide piece accommodating portions that project outward from the side wall of the drum accommodating portion and have passages through which the inner cable is inserted in a tangential direction and that extend parallel to each other. A shaft that is rotatably housed so that both ends project respectively, a wiper arm mounting portion is provided at a portion projecting from the tip of the bearing portion, and a drum mounting portion is provided at a portion projecting inside the drum housing portion. And a locking portion fixed to the drum mounting portion of the shaft so as to rotate together with one spiral cable guide groove in the periphery and for locking the inner cable at both ends of the cable guide groove. Driven by A ram, and a guide piece slidably inserted into the guide piece accommodating portion, having a portion for fitting and holding a conduit of a pulling control cable at one end, and having a passage for inserting an inner cable, And a spring that elastically biases the guide piece in a direction away from the housing. Also in this case, it is preferable that the passage for inserting the inner cable of the guide piece accommodating portion communicates with the opening side of the drum accommodating portion with a size allowing the inner cable to pass therethrough.

The drive unit of the wiper drive device of the present invention comprises a rotary drive means comprising a motor and a speed reducer, a drive lever fixed to the output shaft of the rotary drive means, and an axis parallel to the center of rotation of the drive lever. A swing plate that is swingably provided around a center within a predetermined angle range, a connecting link that connects the drive lever and the swing plate, and a pair of pull control cable conduits face the swing plate. And a base plate having a boss that rotatably holds a shaft that supports the swing plate at one end and a base plate on which the cable mounting bracket is erected at the other end. The moving plate is a plate member that extends linearly, and the end portions of the inner ropes are rotatably connected to the equidistant positions with the rotation center interposed therebetween. Preliminary second pin has been erected,
A third pin, which is rotatably connected to one end of the connecting link, is provided upright at an end outside the one pin. In such a drive unit, it is preferable that the first and second pins are erected on the side of the base plate and the third pins are erected on the opposite side.

[0013]

In the wiper drive device of the present invention, when the output shaft of the drive unit rotates in one direction, the drive lever also continuously rotates in one direction, and the swing plate reciprocally swings. When the swing plate swings to one side, one inner cable of the pair of first pulling control cables is pulled, and the pulling force of the other inner cable is relaxed. When the oscillating plate oscillates in the opposite direction, the oscillating plate pulls the other inner cord and loosens the force pulling one inner cord, contrary to the above. On the side of the first driven portion, when one inner cable is pulled out from the driven drum of the first driven portion, the driven drum is rotated in one direction by a predetermined angle, and
The other inner rope whose pulling force has been relaxed is wound on the driven drum. Conversely, when the other inner cable is pulled out, the driven drum rotates in the opposite direction. In this way, the driven drum of the first driven portion is alternately driven in the opposite direction by the alternate pulling operation and feeding operation of the pair of inner cords by the driving portion. Therefore, the shaft fixed to the driven drum alternately rotates, and the wiper arm to be attached to the shaft can be swung.

Further, as the driven drum alternates, the drive drum fixed to the same shaft also alternates in synchronization. Thereby, one inner cable of the second control cable locked to the drive drum is wound on the drive drum, and the other inner cable is unwound. Therefore, the driven drum of the second driven portion, to which the other ends of the inner cords are locked, also reciprocally rotates in synchronization. As a result, the wiper arm to be attached to the shaft of the second driven portion can be reciprocally rocked in synchronization with the wiper arm of the first driven portion.

In the device of the present invention, the drive section and the first driven section are connected by the pair of first control cables,
Since the first driven section and the second driven section are connected by the pair of second control cables, the first driven section and the second driven section are in the form of an elongated unit as a whole. Therefore, it is easy to handle and easy to mount on a car. Further, in the first driven portion, the orientation of the first control cable and the orientation of the second control cable can be largely changed. As a result, it is possible to make the L-shaped form easier to attach to the inside of the automobile.

The movement of the pair of inner cords is guided along a curved path by a conduit that slidably guides them, but in order to maintain a predetermined tension in the inner cords, the conduits are the reaction. Withstands the compressive force of. Therefore, if an urging means such as a spring for applying a compressive force to the conduit is interposed between one end of each conduit and the cable mounting bracket in the drive part or the housing in the driven part, the inner rope will be stretched and the tension will be increased. When reduced, the conduit can be moved away from the mount in response to the reduced compressive force of the conduit. As a result, the effective length of the conduit is increased, and the slack in the inner cord can be absorbed.

If the drive drum of the first driven portion has a larger effective diameter than the driven drum of the second driven portion, the swing angle of the wiper of the second driven portion is larger than the swing angle of the wiper of the first driven portion. Become. Therefore, for example, the driver side wiper can be swung at a larger angle than the passenger side wiper.

In the driven portion of the present invention, since the bearing portion also serves as the attachment portion to the front panel of the automobile, it has a sufficiently large bearing action and occupies a small space in the vehicle. Furthermore, the conduit is fitted and held in the guide piece, and the guide piece is slidably installed in the guide piece accommodating part of the housing, and is biased in the direction away from the housing by a spring, so the extension of the inner line is smoothly absorbed. can do. When the passage for inserting the inner cable of the guide piece accommodating portion is communicated with the open side of the drum accommodating portion with a size that allows the inner cable to pass, the inner cable can be assembled to the housing while the drum is assembled. , High workability.
In the drive unit of the present invention, the rocking plate is an elongated plate member, and therefore does not take up space. Further, in the case where the first pin and the second pin are provided on one surface of the oscillating plate and the third pin is provided on the other surface, the inner cable and the connecting link do not interfere with each other, so to speak, they are assembled three-dimensionally, There is little mounting space.

[0019]

Embodiments of the wiper drive device of the present invention will be described below with reference to the drawings. 1 is a front view showing an embodiment of the wiper drive device of the present invention, FIG. 2 is a front view showing an embodiment of the drive unit of the present invention, FIG. 3 is a bottom view of the drive unit of FIG. 2, and FIG. 2 is a schematic perspective view of the drive unit of FIG. 2, FIG. 5 is a front view showing an embodiment of the driven unit of the present invention, FIG. 6 is a sectional view taken along line VI-VI of FIG. 5, and FIG. 7 is a perspective view of the driven unit of FIG. FIG. 8 is a front view showing another embodiment of the driven portion of the present invention, and FIG. 9 is IX-IX of FIG.
FIG. 10 is a sectional view taken along the line, and FIG. 10 and FIG. 11 are perspective views showing one embodiment of the housing according to the present invention as seen from the front side and the back side.

The wiper driving device A shown in FIG.
And a first driven part 4 connected to the drive part 1 by a pair of first pull control cables (hereinafter, simply referred to as cables) 2 and 3, and a further pair of the first driven part 4 with respect to the first driven part 4. The second driven portion 7 is connected by the second cables 5 and 6. The drive unit 1
Has a motor M and a speed reducer G connected to the motor M, and outputs the rotation output of the speed reducer to the first cables 2, 3
It has a crank mechanism 8 for converting into an alternate reciprocating operation. The first driven portion 4 converts the reciprocating operation of the first cables 2 and 3 into the reciprocating oscillating motion of the first wiper arm 9 and the reciprocating operation of the second cables 5 and 6. The second driven portion 7 further converts the reciprocating motion of the second cables 5 and 6 into the reciprocating oscillating motion of the second wiper arm 10.

2, FIG. 3 and FIG. 4 show the main part of the above-mentioned drive unit 1. As shown in FIG. 3, the motor M and the motor M are provided on the rear surface side of the bracket 11 for mounting on the vehicle body of the automobile. A speed reducer G is provided, and the crank mechanism 8 and the cable mounting bracket 12 are arranged on the front side. The speed reducer G includes, for example, a worm and a worm wheel, and the output shaft 13 is rotatably supported by the housing of the speed reducer G. One end of a drive lever 14 is fixed by a nut 15 to the tapered surface 13a at the end of the output shaft 13. One end of a connecting link (hereinafter, simply referred to as link) 17 is rotatably connected to the other end of the drive lever 14 by a pin 16.

Further, as shown in FIG. 2, an elongated plate-shaped base bracket 18 is fixed to the bracket 11 by a screw 19, and a swing plate 21 is rotatably connected to a boss portion 20 provided at one end thereof. There is. The other end of the link 17 is rotatably connected to a pin 22 fixed to the upper surface side of the end portion of the swing plate 21 (upper side in FIG. 3, the same applies hereinafter). The drive lever 14 and the link 1 described above
7. The swing plate 21 constitutes a four-bar linkage mechanism together with the bracket 11, and the crank mechanism 8 which converts the rotation of the drive lever 14 into the reciprocating rotary motion of the swing plate 21.
Has become.

Furthermore, on the lower surface side of the rocking plate 21, a pin 23 for attaching an inner cable is provided at a position equidistant from the center of rotation.
Are fixed, and the inner cables 24 and 25 of the first cables 2 and 3 are rotatably connected to these pins by a cable end member. On the other hand, the conduit 2 of the first cable 2, 3
6, 27 are fitted and held by the above-mentioned cable mounting bracket 12 provided on the other end side of the base bracket 18.

In this embodiment, the drive lever 14 saves space while avoiding interference with the nut 15.
As shown in FIG. 3, bend twice in the middle in opposite directions,
The link 17 side is displaced upward from the output shaft 13 side.
Further, the link 17 and the first cables 2 and 3 are arranged substantially in parallel to save space. In order to realize such an arrangement, the connecting portion of the rocking plate 21 with the link 17 and the connecting portion with the first cables 2, 3 are arranged in the same straight line, and the rocking neutral positions (see FIG. 4) are arranged. It is arranged at a right angle to the rocking plate 21 at the position indicated by the solid line). Further, the link 17 and the first cables 2 and 3 are arranged on both front and back surfaces of the swing plate 21 to avoid interference between the two, and the space between the link 17 and the bracket 11 is used to make the first cable 2, The wiring space is 3 and the dimension of the drive unit 1 in the thickness direction is made as small as possible.

Therefore, the spatial arrangement of the above elements is
As shown in FIG. 4, it is extremely compact. Even if the drive lever 14 further rotates and the link 17 and the swing plate 21 rotate accordingly, the space of the space swept by them, particularly the dimension in the thickness direction, is small. Therefore, even if it is arranged at the front of a relatively small automobile, it is possible to secure a sufficient installation space for other devices. Furthermore, since the pulling control cables (first cables 2 and 3) having flexibility are connected to the driven portion, the degree of freedom of the installation location of the driving portion 1 is high.

Of the driven parts, the second driven part 7 having a basic structure will be described with reference to FIGS. 5, 6 and 7. The second driven portion 7 includes a housing 31, a shaft 32 rotatably provided in the housing 31,
And a drum (driven drum) 33 fixed to the shaft 32. As shown in FIGS. 6 and 7, the housing 31 has a cylindrical drum housing portion 34 with a bottom, and a cylindrical bearing portion 36 that projects outward from the bottom portion 34a at substantially right angles.
And a guide piece accommodating portion 37 protruding tangentially from the side wall 34b of the drum accommodating portion 34. A cylindrical hole 37a is formed in the guide piece accommodating portion 37, and a guide piece (or thimble) 4 for fitting and holding the ends of the conduits 38, 39 of the second cables 5, 6 is formed in the hole.
0 is slidably inserted. A flange 40a is provided at the end of the guide piece 40 on the side where the conduit is mounted.
A compression coil spring (hereinafter referred to as a spring) 41 is arranged around the guide piece 40, and the flange portion 40 a of the guide piece 40 and the end surface 37 of the guide piece housing portion 37 are arranged.
The spring 41 is interposed between this spring and b. An annular projection 37c that engages with the inner surface of the spring 41 is provided on the end surface 37b of the guide piece housing portion 37.

Further, in this embodiment, as shown in FIG.
The hole 37a of each guide piece accommodating portion 37 is formed in the drum accommodating portion 3
4 is formed with a groove 42 communicating to the opening side (the front side in FIG. 7) of the drum 4, and the groove 42 continues to the internal cavity 43 of the drum accommodating portion 34. The groove 42 is the second cable 5,
The inner cords 44 and 45 of 6 are inserted therethrough, and have a width corresponding to that, and between the bottom of the hole 37a and the internal cavity 43, the depth is set to the center of the hole 37 or more. (See FIG. 11 in the first driven portion).

As shown in FIG. 6, one end of the shaft 32 projects from the bearing 36 and is stopped by a retaining ring 46. A tapered serration 47 and a male screw 48 for fixing the base of the second wiper arm (reference numeral 10 in FIG. 1) are formed at the end of the protruding shaft 32. On the other end side of the shaft 32, a flat portion 49 for fixing the drum 33 and a male screw 50 are formed. The flat portion 49 is fitted into a hole of the same shape formed in the boss portion of the drum 33, and further fixed to the shaft 32 by a nut 51 screwed with the male screw 50. On the outer peripheral surface of the bearing portion 36 of the housing 31, a male screw 5 that is screwed with a nut 52 for attaching the housing 31 to the front panel of the automobile.
3 is formed, and the thicker portion 54 is fitted with a spacer 55 having a tapered surface for setting the angle of the wiper arm (drive shaft) according to the individual vehicle.

As shown in FIG. 7, one spiral guide groove 58 is formed on the outer circumference of the drum 33. The guide groove 58 draws a spiral of about 2 to 3 turns, and both ends thereof communicate with locking holes 59 and 60 for locking the cable end members 44a and 45a of the inner cables 44 and 45. Insertion grooves 59a and 60a extending substantially diametrically are formed from the surface side of the drum 33 to the guide groove 58. The insertion grooves are formed in the inner ropes 44, 45 and the rope end members 44a, 45a.
Is attached to the locking holes 59 and 60 of the drum 33 in a state where the is attached. That is, the inner cords 44 and 45 pass the roots through the insertion grooves 59a and 60a, and the cord end member 4
5a and 46a may be inserted into the locking holes 59 and 60, and then wound around the drum 33 along the guide groove 58. 2
The inner cords 44 and 45 of the book are provided with one spiral guide groove 5 each.
Since it is wound from both ends of 8, it will be wound in the opposite direction as shown in FIG. Therefore, when one of the inner cords (for example, the inner cord 44) is pulled in the direction of the arrow P, the drum 33 rotates in the direction of the arrow P1 as the inner cord is unwound, and at the same time, the other inner cord 45 is connected to the drum 33. By being wound up, it will be pulled in the direction of arrow Q.

The first driven section 4 shown in FIGS. 8 and 9 is obtained by adding a drive drum 61 to the second driven section 7. However, since the other configurations are almost the same, the same portions or parts are designated by the same reference numerals and the description thereof will be omitted. That is, as shown in FIG.
Has a depth for accommodating two drums, and two drums, that is, a driving drum 61 and a driven drum 62 are concentrically fixed to the drum mounting portion of the shaft 32. In this embodiment,
A drive drum 61 is provided on the bottom side of the drum accommodating portion 34, and a driven drum 62 is provided outside thereof. The driven drum 62 is substantially the same as the driven drum 33 in the second driven portion 7 except for the effective diameter. The driving drum 61 has substantially the same shape as the driven drum 33 except for the effective diameter, and the inner cables 44, 45 of the second cables 5, 6 connected to the second driven portion 7 are connected to the drum. The installation method is the same. Two drums 61 and 62 are provided for the purpose of easily attaching the inner cords 44 and 45.
One large drum could be employed if desired. By thus providing the drive drum 61 on the bottom side of the drum accommodating portion 34, the drive drum 61 and the above-described second drum are provided.
The positional relationship between the driven portion 7 and the driven drum 33 corresponds to the second
The cables 5, 6 can be arranged in a substantially planar manner.

Further, on the side wall 34b of the drum accommodating portion 34 of the housing 31 of the first driven portion 4, in addition to the guide piece accommodating portion 37 extending in the tangential direction of the driven drum 62, a cable attaching portion extending in the tangential direction of the driving drum 61. 63 is provided. As shown in FIG. 8 or 10, the cable attachment portion 63 is displaced from the guide piece accommodating portion 37 by a predetermined angle (45 ° in this embodiment). The cable attachment portion 63 does not house the guide piece, but only has a hole for fitting and holding the conduit of the second cable 5 or 6 that drives the second driven portion. Therefore, the entire width of the left and right cable attachment portions 63 is almost the same as the outer diameter of the housing 31. And FIG.
As shown in FIG. 1, each cable attachment portion 63 is formed with an insertion groove 64 for inserting the inner cable from the opening side, and the insertion groove 64 is formed in the side wall 3 of the drum accommodating portion 34.
4b communicates with a groove 65 cut in a direction parallel to the axis and inwardly contacting the internal cavity 43. The grooves 65 extend near the bottom 34a of the drum housing 34 so as to correspond to the guide grooves 58 of the drive drum 61. By tilting the cable attachment portion (center line thereof) with respect to (center line of) the guide piece accommodating portion by 45 °, the insertion groove 64 can be arranged along the outer surface of the guide piece accommodating portion 37. The thickness of the portion 37 can be used also as the thickness of the cable attachment portion 63. But 60 ° to 90 °
It can also be arranged at other angles.

The cable mounting bracket 12 of the drive unit 1 and the housing 3 of the first driven unit 4 configured as described above.
1 is connected by the conduits 26 and 27 of the first cables 2 and 3, and the oscillating plate 21 of the drive unit 1 and the driven drum 62 of the first driven unit 4 are connected by the inner ropes 24 and 25 inserted through them. Further, the housings of the first driven part 4 and the second driven part are
By connecting with the conduits of the cables 5 and 6, and connecting the drive drum 61 of the first driven part 4 and the driven drum 33 of the second driven part with the inner cable inserted through them, the wiper drive device A shown in FIG. Is obtained. In this device, the drive unit 1
When the motor M of the motor rotates in one direction, the output shaft 1 of the speed reducer G
The oscillating plate 21 reciprocally oscillates at the same cycle as the number of rotations of the first and second driven parts 4 and 4 and the driven drum 62 of the first driven part 4 reciprocally rotates via the inner cable of the two first cables 2 and 3, and The wiper wipes the windshield. And the shaft 3 of the first driven portion 4
Since the drive drum 61 reciprocally rotates due to the rotation of 2, the driven drum 33 of the second driven portion 7 reciprocally rotates via the inner cable of the second cables 5 and 6, and is attached to the shaft 32.
The wiper swings in the same cycle and in the same direction as the first wiper. However, the swing angle of the second wiper is larger than that of the first wiper. If the first driven part 4 is omitted and the drive part 1 and the second driven part 7 are directly connected by a cable, a wiper drive device for driving one wiper can be obtained.

[0033]

In the wiper drive device of the present invention, the drive portion and the first driven portion and the first driven portion and the second driven portion are connected by a pair of pull control cables, respectively, so that The installation space and the working space for the vehicle body are small, the installation work is easy, and the degree of freedom in arranging the drive unit is particularly high. Furthermore, since the pull control cable is flexible, it is more safe in a vehicle collision than a rod link type wiper. Furthermore, in the case of a rod link type wiper, considering the safety of a vehicle fire etc., it is not possible to wire a wire harness that may short circuit due to wear around it, but it is possible if it is a cable type. Is. If a biasing means for biasing the conduit in the direction of compressing the conduit is interposed between the driving part and the driven part, or between the end of the conduit provided between the driven parts and the other housing, With a simple structure, it is possible to automatically absorb the extension of the inner cord.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a wiper driving device of the present invention.

FIG. 2 is a front view showing an embodiment of a drive unit of the present invention.

FIG. 3 is a bottom view of the driving unit shown in FIG.

FIG. 4 is a schematic perspective view of the driving unit of FIG.

FIG. 5 is a front view showing an embodiment of a driven portion of the present invention.

6 is a sectional view taken along line VI-VI of FIG.

FIG. 7 is a perspective view of a driven portion of FIG.

FIG. 8 is a front view showing another embodiment of the driven portion of the present invention.

9 is a sectional view taken along line IX-IX in FIG.

FIG. 10 is a front side showing an embodiment of a housing according to the present invention.

11 is a perspective view of the housing shown in FIG. 10 and the back surface side.

[Explanation of symbols]

 A wiper drive unit 1 drive unit 2 first cable 3 first cable 4 first driven unit 5 second cable 6 second cable 7 second driven unit M motor G reducer 8 crank mechanism 12 cable mounting bracket 13 output shaft 14 drive Lever 17 Link 21 Swing plate 24 (First) inner cable 25 (First) inner cable 26 (First) conduit 27 (First) conduit 31 Housing 32 Shaft 33 (Following) drum 38 (Second) conduit 39 ( Second) conduit 41 spring 44 (second) inner cable 45 (second) inner cable 61 driving drum 62 driven drum

Claims (11)

[Claims] 1. (A) A rotary drive means comprising a motor and a speed reducer, which has an output shaft rotating in one direction, a drive lever fixed to the output shaft of the rotary drive means, and a rotation of the drive lever. And a drive unit having a cable mounting bracket for mounting a pair of conduits of the first control cable so as to face the swing plate, and a (B) housing. A shaft rotatably supported in the housing and having a wiper arm mounting portion at one end, a driven drum and a drive drum fixed in the other end of the shaft and housed in the housing, and the housing To
A first driven portion having a driven cable attachment portion provided in a tangential direction of the driven drum and a drive cable attachment portion provided in the housing in a tangential direction of the drive drum;
(C) A pair of first conduits, one end of each of which is fitted and held in the cable mounting bracket of the drive unit and the other end of which is mounted in the driven cable mounting portion of the first driven unit, and inside the first conduit, respectively. Slidably inserted into the rocking plate, one end of which is connected to a position equidistant from the center of rotation of the rocking plate, and the other end of which is locked by the driven drum and wound in the opposite direction. A pair of first pulling control cables that connect the drive unit and the first driven unit, which includes the first inner cable, (D) housing, and are rotatably supported in the housing and have a wiper arm attached to one end. A shaft having a part and fixed to the other end of the shaft,
A second driven portion having a driven drum housed in the housing and a driven cable attachment portion provided in the housing in a tangential direction of the driven drum; and (E) a drive cable of which one end side is the first driven portion. A pair of second conduits attached to the attachment portion and the other end side of which are attached to the driven cable attachment portion of the second driven portion, and slidably inserted into the second conduits, respectively, and one end side of which is the first It is composed of a pair of second inner ropes which are locked to the drive drum of the driven portion and wound in the opposite direction, and the other end side of which is locked to the driven drum of the second driven portion and wound in the opposite direction. , First
A cable type wiper drive device comprising: a driven part and a pair of second pull control cables connecting the second driven part. 2. A biasing means for applying a compressive force to the conduit is interposed between at least one end of the pair of first conduits and the cable mounting bracket or the housing, and the pair of first conduits are provided. 2. The device according to claim 1, wherein a biasing means for applying a compressive force to the conduit is interposed between an end of at least one of the two conduits and the housing. 3. A guide piece is slidably attached to the driven cable attachment portions of the housings of the first and second driven portions and biased in a direction away from the housing, and the first conduit and the second conduit are attached. The device according to claim 2, wherein the device is fitted and held by those guide pieces. 4. The apparatus according to claim 1, wherein the effective diameter of the drive drum of the first driven portion is larger than the effective diameter of the driven drum of the second driven portion. 5. The device according to claim 1, wherein the first driven part is omitted, and the drive part and the second driven part are directly connected by a pair of control cables. 6. A cylindrical drum housing having a bottom and a cylinder housing that is concentrically outwardly extended from the bottom of the drum housing, and around which a mounting portion for a front panel of an automobile is provided. The bearing portion and the passages that respectively project outward from the side wall of the drum housing portion and pierce the inner cable in the tangential direction,
And a pair of cylindrical guide piece accommodating portions that extend parallel to each other, and passages that respectively project outward from the side walls of the drum accommodating portion and that insert the inner cable in the tangential direction, and are different from the guide piece accommodating portion. A housing having a pair of cylindrical drive cable attachment portions that extend in parallel to each other at an angle, and a housing that is rotatably housed in the bearing portion so that both ends thereof project respectively, and is located at a portion projecting from the tip of the bearing portion. A wiper arm mounting portion is provided, and a shaft provided with the drum mounting portion at a portion projecting into the drum accommodating portion, and one spiral around the shaft fixed to the drum mounting portion of the shaft so as to rotate together. A drive drum and a driven drum having locking portions for locking inner cords at both ends of the cable guiding groove, and inside the guide piece accommodating portion. Inserted movably in a guide piece having a passage having a portion for fitting holding the conduit control cable pulling on one end, and inserting the Uchisaku,
A driven part of the wiper drive, comprising a spring that elastically biases each guide piece in a direction away from the housing. 7. The passage for inserting the inner cable of the guide piece accommodating portion and the drive cable mounting portion traverses the side wall of the drum accommodating portion with a size that allows the inner cable to pass through and communicates with the opening side. The follower described. 8. A cylindrical drum housing portion having a bottom and a cylindrical housing portion concentrically extending outward from a bottom portion of the drum housing portion and having a mounting portion for mounting to a front panel of an automobile provided around the drum housing portion. The bearing portion and the passages that respectively project outward from the side wall of the drum housing portion and pierce the inner cable in the tangential direction,
And a housing having a pair of tubular guide piece accommodating portions extending in parallel to each other, and rotatably accommodated in the bearing portion so that both ends thereof protrude, and a wiper is provided at a portion protruding from the tip of the bearing portion. A shaft provided with an arm attachment portion and provided with a drum attachment portion at a portion projecting into the drum accommodating portion, and one spiral cable fixed around the shaft so as to rotate together with the drum attachment portion of the shaft. A driven drum having a guide groove and locking portions for locking the inner cable at both ends of the cable guide groove, and a pull control cable slidably inserted into the guide piece accommodating portion at one end. A guide piece having a portion for fitting and holding the conduit of the above, and having a passage for inserting the inner cable, and a spring for elastically biasing each guide piece in a direction of separating from the housing. Are, follower of the wiper driving device. 9. The driven part according to claim 8, wherein the passage through which the inner cable of the guide piece housing portion is inserted communicates with the opening side of the drum housing portion with a size that allows the inner cable to pass therethrough. 10. A rotary drive means comprising a motor and a speed reducer, a drive lever fixed to an output shaft of the rotary drive means, and a swinging motion within a predetermined angle about an axis parallel to the rotation center of the drive lever. An oscillating plate movably provided, a connecting link connecting the drive lever and the oscillating plate, and a cable mounting bracket for attaching a conduit of a pair of pull control cables so as to face the oscillating plate. The oscillating plate is a plate member that has a boss that rotatably holds a shaft that supports the oscillating plate at one end, and a base plate that erected the cable mounting bracket at the other end. The first and second pins that rotatably connect the ends of the inner cable are erected at equidistant positions with the center of rotation therebetween. A drive unit of the wiper drive device in which a third pin, which is rotatably connected to one end of the connecting link, is provided upright at an end outside the one pin. 11. The drive unit according to claim 10, wherein the first and second pins are erected on the side of the base plate, and the third pin is erected on the opposite side.