JPS6230534Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a pantograph type wiper wiping device for wiping away raindrops etc. adhering to the windshield glass surface of an automobile, and in particular aims to reduce the weight of the device while maintaining high dimensional accuracy and strength. This paper proposes a pantograph type wiper wiping device.

In a pantograph type wiper wiping device, the wiper blade that slides against the windshield glass surface is rotatably supported by a main arm and an auxiliary arm at two supporting points spaced apart by an appropriate length, and the wiper blade is rotatably supported by a main arm and an auxiliary arm, respectively. The main arm and the auxiliary arm are attached to a main shaft and an auxiliary shaft, respectively, which are provided to protrude outward from the vehicle body, and the main arm is rotationally driven by a motor while the auxiliary arm and the auxiliary shaft are relatively rotated. Accordingly, the main arm and the auxiliary arm work together to maintain the wiper blade in a fixed direction while sliding the windshield glass surface to wipe off the raindrops that have adhered to it.
The main shaft to which the main arm is attached is attached to a motor case that houses the wiper drive motor and link mechanism, etc., and this motor case is fixedly installed on the vehicle body. In response to these demands, vehicles are being made lighter, and motor cases that were conventionally made of die-cast aluminum or steel plates are being replaced with ones made of molded resin. However, since a resin motor case has lower material strength than one made of aluminum or steel plate, the shaft mounting surface of the motor case is susceptible to external forces applied when the motor case is mounted to the vehicle body and wiper blades are wiped away. Deformation may occur due to external force applied to the main shaft during surface sliding, and the perpendicularity between the main shaft and the shaft mounting surface of the motor case may be impaired. If this happens, the gears of the link mechanism that connects the main shaft and the motor rotor will become in an abnormally engaged state.
Inconveniences such as generation of noise occur, and furthermore, an abnormal load is applied to the motor, deteriorating the durability of the device. Due to these circumstances, for the purpose of improving the installation accuracy between the main shaft and the auxiliary shaft,
The problem becomes even more problematic when the auxiliary shaft is also attached directly to the motor case.

The present invention was developed in view of the above points, and by reinforcing the parts of the motor case where strength is required with metal set plates such as steel plates, it is possible to reduce the weight of the device and strengthen the required parts. It is an object of the present invention to provide a pantograph type wiper wiping device which improves the accuracy of the installation of a main shaft and an auxiliary shaft. A pantograph wiper wiping device according to the present invention is a pantograph wiper wiping device in which a wiper blade is supported by a main arm and an auxiliary arm, and includes a resin motor case housing a motor that swings the main arm;
a main shaft connected to the motor and rotatably mounted on the shaft mounting surface of the motor case so as to protrude outward from the shaft mounting surface;
an auxiliary shaft mounted substantially parallel to the main shaft on the shaft mounting surface near the main shaft; The motor is characterized in that it has a metal set plate attached to the motor case together with the shaft, and the main arm and the auxiliary arm are connected to the main shaft and the auxiliary shaft, respectively.

Hereinafter, the present invention will be specifically explained based on the drawings. FIG. 1 is a plan view of a motor case 1 showing one embodiment of the present invention. The motor case 1 is manufactured by molding resin, and consists of a box-shaped case portion 1a and its lid 1b. A motor and a link mechanism (both not shown) for swinging the wiper blade are housed in the case portion 1a.
The case portion 1a and the lid 1b are fastened and fixed with bolts 4 at five locations. The cylindrical support shaft 2a and the auxiliary shaft 3 are both mounted to appropriate lengths on the shaft mounting surface A, which is the bottom surface of the box-shaped case portion 1a, so that their longitudinal directions are perpendicular to the shaft mounting surface A. They are fixedly installed at a distance. The support shaft 2a has a thread cut on its outer circumferential surface, and the motor case 1 is connected to the vehicle body (see Fig. 1).
In order to fix it to the position (indicated by a dashed line), a spring washer 2c is fitted and a nut 2b is further screwed onto the spring washer 2c. The main shaft 2 is inserted through this cylindrical support shaft 2a. The main shaft 2 has a support shaft 2a inserted through the inner surface of the case portion 1a so that its tip protrudes from the support shaft 2a to the outside, and its rear end is provided with an arm (not shown) connected to a link mechanism. In addition, the main shaft 2 is prevented from being pulled out from the support shaft 2a. The tip of the main shaft 2 is threaded, as will be described later.
The main arm 8 is fixed to the main shaft 2. The cap 2d is made of rubber and is fitted onto the support shaft 2a to prevent rainwater from entering the vehicle body. On the other hand, the auxiliary shaft 3 is formed by integrally forming a joint ball 3a and a support section 3b.
has a substantially spherical shape with a predetermined diameter, and connects the auxiliary arm 9 and the auxiliary shaft 3 as described later. Further, a bolt 5b is fixedly installed on the shaft mounting surface A at a position facing the auxiliary shaft 3, and a spring washer 5c is attached to the bolt 5b.
and then insert a nut 5a on the tip side of the bolt.
The motor case 1 is fixed to the vehicle body by screwing them together. Note that 7 is a recess provided in the shaft mounting surface A to regulate the relative positional relationship with the vehicle body when the motor case 1 is attached to the vehicle body.

Next, the mounting manner of the support shaft 2a, the auxiliary shaft 3, and the bolt 5b fixed to the shaft mounting surface A of the motor case 1 will be described in detail. 2 to 4 show only the members fixed to the case part 1a, and FIG. 2 is a front view of the case part 1a, and FIG.
The figure is a sectional view taken along the - line in FIG. 2, and FIG. 4 is a rear view showing the inside of the case portion 1a. A support shaft 2 is mounted on the shaft mounting surface A of the box-shaped case portion 1a.
A, a hole is provided at each location of the auxiliary shaft 3 and the bolt 5b, and a long plate-shaped set plate 6 is superimposed on the shaft mounting surface A so as to communicate the holes. The set plate 6 is the fifth
Figure 6 shows the plan view, and Figure 6 shows the plan view of Figure 5.
As shown in the cross-sectional view taken along the line, three holes 6a, 6b, 6c are formed with the respective separation distances of the support shaft 2a, auxiliary shaft 3, and bolt 5b as forming pitches. The peripheral edge slightly protrudes toward one side of the set plate 6. The set plate 6 having such a shape is inserted into each of the holes 6a to 6c of the set plate 6 in a recess shaped to follow the planar shape of the set plate 6 formed at the location where the support shaft 2a, etc. is disposed on the shaft mounting surface A. The protrusion is fitted into the hole in the shaft mounting surface A.

The auxiliary shaft 3 is threaded at the end of the support column 3b on the opposite side of the joint ball 3a, and the joint ball 3a is slightly threaded from the threaded end.
A flange-like stopper 3c is provided at a closer position. With the set plate 6 superimposed on the shaft mounting surface A, the end of the support shaft 3b of the auxiliary shaft 3 is inserted into the hole 6b of the set plate 6, and is fitted into the recess formed on the inner surface of the shaft mounting surface A. Screw the threaded end of the support column 3b into the nut 3d, tighten the set plate 6 between the stopper 3c and the nut 3d, and fix the set plate 6 and the auxiliary shaft 3 to the arm mounting surface A of the case section 1a. do. On the other hand, as described above, the support shaft 2a has a thread cut on the circumferential surface of the portion that protrudes outward from the motor case 1a, and a flange is provided at the boundary between the portion located inside the motor case 1a and the threaded portion. A stopper 2e having a shape is formed. Then, insert the tip threaded part of the support shaft 2a into the hole 6a of the set plate 6 from the inner surface of the case part 1a, press fit the press-fitting part 2f formed closer to the threaded part than the stopper 2e into the hole 6a, and then press the support shaft 2a. is fixed to the set plate 6 and case portion 1a. The shape of the periphery of the stopper 2e is similar to the nut 3d, as shown in FIG.
e is fitted into a recess formed on the inner surface of the shaft mounting surface A so as to align with this stopper 2e,
The support shaft 2a is configured not to rotate in its circumferential direction. Further, the bolt 5b is also formed with a flange-like stopper 5d having the same shape as the stopper 2e on the opposite side of the threaded part, and a press-fitting part 5e is formed near the threaded part, so that the bolt 5b can be attached to the case part. Insert into the hole 6c of the set plate 6 from the inner side of 1a, press-fit the press-fitting part 5e into the hole 6c, and press the stopper 5d.
The bolt 5b is fixed to the set plate 6 and the case portion 1a by fitting into a recess formed on the inner surface of the shaft mounting surface A.

As mentioned above, the support shaft 2a,
The motor and link mechanism are housed in the motor case 1 to which the auxiliary shaft 3, bolts 5b, and set plate 6 are fixed, and the main shaft 2 is connected to the support shaft 2.
After the cover 1b of the motor case 1 is fixed to the case portion 1a with bolts 4.
Then, the motor case 1 assembled in this way is attached to the vehicle body (indicated by dashed lines in FIG. 3) with nuts 2b and 5 with each shaft protruding outside the vehicle body.
Tighten and secure with a (see Figure 1). Then, the set plate 6 is placed outside the auxiliary shaft 3,
The support shaft 2a and the bolt 5b are also tightened and fixed to the shaft mounting surface A.

As shown in FIG. 7, the mounting portion 8b at the tip of the main arm 8 of the wiper operating section is fixed to the tip of the main shaft 2 by tightening a nut. Main arm 8
The arm shank 8 is attached to the end of the motor case 1 side.
A is fixed to the arm shank 8a, and an attachment part 8b to the main shaft 2 is connected to the arm shank 8a so as to be mutually rotatable, that is, so that the main arm 8 can stand up from the glass surface to be wiped. The main arm 8 is biased toward the glass surface by a spring spring (not shown) interposed between the main arm 8 and the mounting portion 8b. The auxiliary arm 9 has a mounting portion 9a fixed to its tip on the motor case 1 side, and a substantially spherical recess (not shown) that aligns with the joint ball 3a is provided at the tip of the mounting portion 9a. The auxiliary arm 9 is attached to the auxiliary shaft 3 by fitting the recess into the joint ball 3a. In this way, since the auxiliary arm 9 and the auxiliary shaft 3 are connected by a ball, the auxiliary arm 9 can rotate in the circumferential direction relative to the auxiliary shaft 3, and can also rotate in the direction in which the auxiliary arm 9 stands up from the glass surface. Can be rotated.

In addition, a connector 1 is provided at a proper location on the wiper blade 11.
0 is fixed, and the connector 10 is rotatably supported at two supporting points spaced apart by an appropriate length at opposite ends of the mounting portions 8b and 9a of the main arm 8 and the auxiliary arm 9, respectively. Therefore, if the length dimensions of the main arm 8 and the auxiliary arm 9 are set appropriately, the wiper blade 11 can be pressed against the windshield glass surface in parallel to the edge in the height direction, and while maintaining that position, the wiper blade 11 can be By swinging the arm 8, the windshield glass surface is reciprocated in a direction perpendicular to the longitudinal direction of the wiper blade 11.

Therefore, in the present invention, the main shaft 2 and the auxiliary shaft 3 that connect the main arm 8 and the auxiliary arm 9, respectively, and the shaft mounting surface of the motor case 1 with the bolts 5b that fix the motor case 1 to the vehicle body are attached. Since the motor case 1 is reinforced by fixing the set plate 6 to the part where the external force A is applied, in other words, the part that requires strength, the motor case 1 itself is made of resin, which reduces the weight of the entire device. This makes it possible to ensure the strength of the required parts while ensuring that the shaft mounting surface A is not deformed even when the motor case 1 is mounted on the vehicle body, and the wiper blade 11 does not slide on the windshield glass surface. Even if an external force is applied when the shaft is moved, the shaft mounting surface A will not be deformed. Therefore,
The perpendicularity of the main shaft 2 and the auxiliary shaft 3 to the shaft mounting surfaces is ensured. On the other hand, main shaft 2
Since both the auxiliary shaft 3 and the auxiliary shaft 3 are attached to the motor case 1, the gap distance between them and the parallel relationship thereof can be set with high precision.
In addition, since the support shaft 2a through which the main shaft 2 is inserted and the auxiliary shaft 3 are press-fitted or inserted into the holes 6a and 6b of the metal set plate 6, respectively, for positioning, the accuracy of these installations is further improved. be able to. In addition, since the auxiliary arm 9 and the auxiliary shaft 3 are connected by a ball joint, the auxiliary arm 9 can rotate not only in the circumferential direction but also in the torsional direction relative to the auxiliary shaft 3. It is possible to buffer the force in the torsional direction applied to the arm 9,
The followability of the auxiliary arm 9 is high.

As explained in detail above, the wiper wiping device according to the present invention has high wiping performance and avoids the occurrence of uneven wiping, is easy to assemble to the vehicle body, and is unnecessary for wiper drive motors and gears of link mechanisms, etc. Since no load is applied, the durability of the motor and the wiping device as a whole can be improved. In addition,
It goes without saying that the present invention is not limited to the specific embodiments described above, and that various modifications can be made within the technical scope of the present invention.

[Brief explanation of drawings]

Fig. 1 is a plan view of a motor case 1 showing one embodiment of the present invention, Fig. 2 is a front view of the case portion 1a, Fig. 3 is a sectional view taken along the - line in Fig. 2, and Fig. 4 is a case portion. 5 is a plan view of the set plate 6, and FIG. 6 is a rear view showing the inside of 1a.
7 is a front view showing the wiper operating section attached to the motor case 1. FIG. Explanation of symbols: 1...Motor case, 2...Main shaft, 3...Auxiliary shaft, 6...Set plate, 8...Main arm, 9...Auxiliary arm.

Claims (1)

[Scope of utility model registration request] In a pantograph type wiper wiping device in which a wiper blade is supported by a main arm and an auxiliary arm, there is provided a resin motor case housing a motor for swinging the main arm, and a motor case connected to the motor from a shaft mounting surface of the motor case. a main shaft rotatably mounted on the shaft mounting surface so as to project outward; an auxiliary shaft mounted substantially parallel to the main shaft on the shaft mounting surface near the main shaft; a metal set plate superimposed on the shaft mounting surface, through which the main shaft and the auxiliary shaft are inserted, and attached to the motor case together with the main shaft and the auxiliary shaft; A pantograph wiper wiping device characterized by being coupled to a main shaft and an auxiliary shaft.