JPS6127742A - Wiper device - Google Patents

Abstract

PURPOSE:To improve a field of view and prevent a wiper arm from play and interference by utilizing a planet gear mechanism consisting of fixed and movable gears to expand and contract periodically the whole wiper arm. CONSTITUTION:A movable gear 12 is disposed which meshes with a fixed gear 11 while turning around the outer peripheral edge thereof, and an operating lever 14 is stretched between the center shaft 13 of the movable gear 12 and an end of a wiper pivot 6. An engaging hole 16 engaging a bevel spline 15 of the wiper pivot 6 and an engaging hole 17 loosely fitting on the center shaft 13 of the movable gear 12 are provided respectively on both ends of the operating lever 14. And as the wiper pivot 6 is rotated, the operating lever 14 swings along the upper surface of the fixed gear 11 so that the movable gear 12 rotatably supported by the operating lever 14 can be rotated while rolling around the outer peripheral edge of the fixed gear 11.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a wiper device, and in particular to an improvement of a wiper device in which a part of the wiping area of the wiper blade can be expanded outward during the swinging process of the wiper arm. Regarding.

Various vehicles, including passenger cars, are equipped with wiper devices to wipe the surfaces of window glass, such as the front window glass and rear window glass, in rainy weather to maintain a good visibility for passengers. In this wiper device, the wiper arm rotates and slides around the wiper pivot, and the wiper blade attached to the tip of the wiper arm wipes the surface of the window glass while drawing an arc, so the corners of the window glass are wiped clean. The problem is that it remains. Therefore, recently, a wiper device has been proposed in which the wiping area of the wiper blade is expanded to the corner of the window panel to ensure sufficient visibility for the occupant.

[Conventional technology]

Conventionally, as this type of wiper device, for example,
The one described in No.-29341 is known. Is this a wiper arm? It consists of a hollow main arm and a sub-arm fitted into the main arm so that it can move forward and backward, and a wiper blade is attached to the tip of the sub-arm. In this wiper device, when the wiper arm swings, the sub-arm slides inside the main arm, and by operating the sub-arm to extend at the corner of the window glass, the wiping area of the wiper blade can be expanded outward. It is.

[Problem that the invention seeks to solve]

However, in the conventional Winoze device described above, the sub-arm moves forward and backward within the main arm, so even if there is a slight play between the main arm and the sub-arm, the sub-arm moves smoothly. In addition, since the wiper arm is always pressed against the window glass surface, there is a problem that if there is the above-mentioned wobbling, the wiper arm is likely to be strained between the two. Further, in the above mechanism, dust and rainwater easily enter the gap between the main arm and the sub-arm, which also prevents the sub-arm from moving smoothly.

[Means for solving problems]

The present invention provides a wiper device that can move extremely smoothly and solves the above-mentioned conventional problems, and its means include arranging a fixed gear coaxially with a wiper pivot that controls the swing of the wiper arm, and A movable gear connected to the Winoze pivot via an operating rod is circumscribed to a fixed gear, and a gear train having at least two transmission gears rotating in the same direction at the same rotation speed is further arranged on the operating rod. death,
This is achieved by a wiper device characterized in that the base of the wiper arm is connected to the same phase position of each of the transmission gears.

[Effect]

The wiper device described above uses a planetary gear mechanism consisting of a fixed gear and a movable gear to periodically expand and contract the entire wiper arm.

〔Example〕

Hereinafter, embodiments of Akira Honsakura will be described in detail based on the accompanying drawings.

In one embodiment of the present invention shown in FIGS. 1 to 4, the wiper device W is configured to transmit driving force from a drive motor (not shown) to the wiper arm 1 via a crank mechanism C. , these drive motors and crank mechanism C
is arranged in the air introduction part 4 formed by the dash upper panel 2 and the cowl top panel 3, and a wiper pivot 6 is provided at the tip of the output side crankshaft 5 of the crank mechanism C.
The bottom edge of is fixed. These 6 wiper pivots are fitted into the pivot block 7 and fixed to the 7 langes 8 formed on the outer periphery of the pivot block 7 and the back surface periphery of the insertion holes 9 formed in the cowl top panel 3. is rotatably supported. Further, a semicircular fixed gear 11 that extends toward the front window spring/I/10 side is integrally formed at the upper end of the pivot block 7, and the center of this fixed gear 11 is coaxial with the wiper pivot 6. It is above.

Further, a movable gear 12 is disposed on the outer circumferential side of the fixed gear 11 and rotates along the outer circumferential edge while meshing with the fixed gear 11.
An operating rod 14 is passed between the tip of the rack and the tip of the rack. A locking hole 16 that meshes with the umbrella-shaped spline 15 of the wiper pivot 6 and an engagement hole 17 that loosely fits the center shaft 13 of the movable gear 12 are provided at both ends of the operating rod 14. With the rotational movement of pivot) 6, the operating rod 1
4 swings along the upper surface of the fixed gear 11, and this operating rod 1
The movable gear 12 rotatably supported by the fixed gear 11
It can be rotated by rolling on the outer periphery of.

Further, above the operating rod 14, there is disposed a gear train G consisting of a pair of transmission gears 18a and 18b having the same number of teeth and an intermediate gear 19 interposed between them. It is supported on the wiper pivot 6 and the center shaft 13 of the movable gear 12.

That is, a bearing hole 21 is provided in the center of one of the transmission gears 18a, above the locking hole 16 of the operating rod 14, and rotatably fitted into a detail 9 formed protruding from the upper surface of the operating rod 14. In addition, the center shaft 13 of the movable gear 12, which passes through the engagement hole 17 of the operating rod 14, is located at the center of the other transmission gear 18b.
The transmission gear 18b rotates integrally with the rotational movement of the movable gear 120, and this rotational movement is transmitted to the transmission gear 18H via the intermediate gear 19. However, the transmission gears 18a and 18b are configured to rotate at the same rotation speed and in the same direction. A retaining surface n corresponding to the non-circular cross section of the fixed hole 22 is formed on the central axis 13 of the movable gear 12, and prevents free rotation of the transmission gear 18b. The above-mentioned intermediate gear 19 is formed in a size that circumscribes both of the transmission gears 18a and 18b, and is rotatably supported by a shaft portion 24 formed protruding from the upper surface of the central portion of the operating rod 14.

Incidentally, groove portions 25.2 are formed on the upper outer periphery of the shaft portions 4 and 24 that are formed protrudingly on the central shaft 13 of the movable gear 12 and the upper surface of the operating rod 14.
6.27 are formed, and these grooves.

By fitting retaining rings 28, 29.31 into 26.27, transmission gears 18a, isb and intermediate gear 1
I've decided not to take out 9. In addition, the transmission gear 18a
.

On the top surface of 18b, support pins 31.32 of the same phase are formed protrudingly at a position offset from the center by a distance a, and this support pin 31.32 is connected to a support provided corresponding to the base of the wiper arm 10. The wiper arm 1 is supported by inserting the wiper arm 1 into the holes U and 35 and fixing its upwardly protruding portions with retaining rings 36 and 37 similar to those described above. The wiper pivot 6 passes through to the upper part of the transmission gear 18H, and a lug 38 is screwed into the upper end.

FIG. 3 shows a model of the operation of the wiper device W having the above configuration, for example, when the ratio of the number of teeth between the fixed gear 11 and the movable gear 12 is set to 4:1. In this example, when the wiper device W is stopped, the wiper arm 1 is held in the (a) position, that is, in a horizontal state on the left side of the wiper pivot 6, and at this time, the support pin 32 of the h transmission gear 18b is the closest to the wiper pivot 6. Because of its location, the wiper arm has the shortest length of one arm. Next, when the wiper nog device W is operated, the operating rod 14 rotates around the wiper pivot 6 ft as the wiper pivot 6 rotates, and the movable gear 12 rotates around the fixed gear 11 while rolling. Then, when the operating rod 14 rotates 45 degrees and reaches the (B) position, the movable gear 12 rotates by % and the operating rod 14
The transmission gear 18b, which is coaxial with the movable gear 12 and rotates with it, also rotates (
b) reach the position. In this process, the rotational force of the transmission gear 18b is the intermediate gear 19f! : Via the other transmission gear 18
The transmission gear 18a also rotates in the same direction as the transmission gear 18b. At this time, transmission gear 18b
The support pin 32 of the transmission gear 18a is located at the farthest point from the wiper pivot 6, and the support pin 31 of the transmission gear 18a also reaches a position corresponding to this support pin 32.

Along with these series of rotational movements, the wiper arm 1 moves from the (a) position to the (b) position while gradually extending outward, and in the (b) position it is in the most outwardly extended state. The amount of extension of the wiper arm 1 is twice the deflection distance a of the support bin 32.

Next, when the wiper arm 1 moves from the (B) position to the (/→ position), the wiper arm 1 further rotates by 45 degrees, so the series of movements will be repeated as described above.
The support pin 32 of the transmission gear 18b is again connected to the wiper pivot 6.
Come to the place closest to. - As a result, the wiper arm 1 gradually contracts with this movement, and becomes in the same state as in position (A), that is, the shortest length.

Since the wiper arm 1 continues to expand and contract every 45° rotation, the wiping area of the wiper blade 39 attached to the tip of the wiper arm 1 covers both corners of the 7p window panel 100, as shown in FIG. Section 40a, 4
0b, the wiper device widens outward to a large extent, and the shaded area in the figure is wider than that of the conventional wiper device, thereby improving the driver's forward visibility.

The wiping pattern of the wiper blade 39 can be determined by appropriately changing the ratio of the number of teeth between the fixed gear 11 and the movable gear 12, or by installing a variable mechanism (not shown) between the movable gear 12 and the transmission gear 18b. It can be changed as appropriate by providing . Further, the amount of extension of the wiper arm 1 can be adjusted by adjusting the size of the transmission gears 18a and 18b. Although the above embodiment has been described with respect to one blade type wiper, it is of course applicable to two or more blade type wipers, and can also be applied to not only the front wiper but also the rear wiper.

〔Effect of the invention〕

As described above, according to the wiper device according to the present invention, the wiping area of the wiper blade can be expanded during the swinging process of the wiper arm, so that an effective visibility can be ensured. Also, a planetary gear mechanism? By using this system, the entire wiper arm is extended and retracted, so the movement becomes smoother, and problems such as wobbling and wrenching of the arm caused by the forward and backward movement of the wiper arm can be prevented.

[Brief explanation of drawings]

Claims (1)

[Claims] A fixed gear is disposed coaxially with a wiper pivot that controls the swing of the wiper arm, and a movable gear connected to the wiper pivot via an operating rod is circumscribed to the fixed gear,
Furthermore, a gear train having at least two transmission gears rotating in the same direction at the same rotation speed is disposed on the operating rod, and the base of the wiper arm is connected to the same phase position of each of the transmission gears. wiper device.