JPH076000U - Wiper drive - Google Patents

Abstract

(57) [Abstract] [Purpose] A wiper device for a vehicle, which is capable of obtaining good wiping performance when the glass surface to be wiped has a large curvature or the curvature changes greatly. The purpose is to obtain a drive. [Structure] The wiper drive shaft (14) is attached to its axis (1
3a) an eccentric shaft (1) which is rotatably supported.
3) is rotatably supported on the housing (11) about an axis (12a) that forms an angle with the axis (13a) of the wiper drive shaft, and the eccentric shaft (13) is connected to the wiper drive shaft (14). In a wiper drive device that is rotated in different angular ranges, a gear (19) rotated by a rod (20) that reciprocates in conjunction with a rod (16) that drives a wiper drive shaft (14). And a gear (18) which meshes with the gear to drive the eccentric shaft (13).

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a wiper device for a vehicle, particularly an automobile, and more particularly to a wiper device capable of providing good wiping performance when the glass surface to be wiped has a large curvature or the curvature changes significantly, and More specifically, a wound core shaft that rotatably supports a wiper drive shaft about its axis is supported on a housing rotatably about an axis that forms an angle with respect to the axis of the wiper drive shaft. And a wiper drive shaft for rotating the wiper drive shaft in different angular ranges.

[0002]

[Prior art]

 A mechanism that keeps the angle of the wiper blade relative to the glass surface at a substantially right angle and keeps the attack angle within a proper range by moving the wiper shaft when the curvature of the glass surface to be wiped is large or the curvature changes significantly. Have been proposed in Japanese Utility Model Publication No. 58-132757 and Japanese Patent Application Laid-Open No. 62-68159. However, in the technologies described in these technical documents, the structure of the bearing portion is complicated and bulky.

[0003]

[Problems to be solved by the device]

 A proposal to improve this and to make the mounting portion of the wiper drive shaft compact and to make it almost the same as a normal one is described in Japanese Utility Model Laid-Open No. 63-189857. The invention described in this publication supports an eccentric shaft that rotatably supports a wiper drive shaft around its axis in a housing rotatably about an axis that forms an angle with the axis of the wiper drive shaft. The eccentric shaft is rotated in an angle range different from that of the wiper drive shaft. However, the speed increase for driving the eccentric shaft in a cycle different from that of the wiper drive shaft, that is, a double cycle in the embodiment. Since the mechanism is adjacent to the wiper motor, two links for transmitting the driving force are required for the wiper shaft drive, and as a result, the wiper drive unit requires an excessively large volume, and the wiper drive unit is suitable for the vehicle interior. There is a problem such as being no longer housed in.

An object of the present invention is to obtain a novel wiper drive device that solves the above-mentioned problems in the conventional technology.

[0005]

[Means for Solving the Problems]

 According to the present invention, an eccentric shaft that rotatably supports a wiper drive shaft about its axis is supported on a housing rotatably about an axis that forms an angle with the axis of the wiper drive shaft, and eccentric. In a wiper drive device in which a shaft and a wiper drive shaft are rotated in different angular ranges, a gear that is rotated by a rod that reciprocates in conjunction with a rod that drives the wiper drive shaft and a gear that meshes with this gear. A wiper drive is provided that includes a gear driving an eccentric shaft.

[0006]

[Action]

 According to the present invention, only one link is required to transmit the driving force for driving the wiper drive shaft and the eccentric shaft from the wiper motor.

Therefore, even in a vehicle where the space for accommodating the wiper drive unit is small, it is possible to install a mechanism for changing the direction of the wiper shaft without interfering with the body of the vehicle, and to interlock the wiper shaft and the eccentric shaft. Since the shooting structure is compact and can be unitized, it is easy to mount on the vehicle.

[0008]

【Example】

 An embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a partial cross-sectional side view showing an essential part of a wiper drive device shown as an embodiment of the present invention, and FIG. 2 is a bottom view thereof. This wiper drive device includes a housing 11 that can be fixed to a vehicle body, an eccentric shaft 13 that is rotatably supported by the housing within a cylindrical hole 12 of the housing 11 around an axis 12a of the hole 12, and an eccentric shaft. The wiper drive shaft 14 is supported by the eccentric shaft 13 so as to be rotatable about an axis 13a that makes an angle with respect to the axis 12a.

The wiper drive shaft 14 is fixed to a link 15 connected to a wiper motor (not shown) and a downward extension of the wiper drive shaft 14, and a rod 16 that reciprocally rotates between a solid line position and a broken line position in FIG. And a ball joint 17 connecting the link 15 and the rod 16 to reciprocally rotate. The eccentric shaft 13 includes gear devices 18, 19, a rod 20 fixed to the shaft of the gear 19, a link 21 connecting the rod 20 and the rod 18 of the wiper drive shaft 14, and a link 21 for the rod 18, respectively. It includes ball joints 22 and 23 connected to 20.

The rods 16 and 20 and the link 21 constitute a parallelogram link, so that the gear 19 makes a reciprocating rotary motion at the same angle in synchronization with the wiper drive shaft 14, and the eccentric shaft 13 Performs a reciprocating rotary motion in synchronization with the wiper drive shaft 14 at a ratio determined by the number of teeth of the gear units 18 and 19.

The rotation of the wiper drive shaft 14 and the concentric shaft 13 can be arbitrarily determined by arbitrarily determining the number of teeth of the gear devices 18 and 19.

[0012]

[Effect of device]

 According to the present invention, only one link is required to transfer the driving force from the wiper motor for driving the wiper drive shaft and the wound core shaft.

Therefore, even in a vehicle in which the space for accommodating the wiper drive unit is narrow, it is possible to install a mechanism for changing the direction of the wiper drive shaft without interfering with the body of the vehicle, and to connect the wiper drive shaft and the eccentric shaft. Since the interlocking mechanism is compact and can be unitized, it is easy to mount on the vehicle.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional side view of a main part of a wiper driving device according to an embodiment of the present invention.

FIG. 2 is a plan view of the wiper driving device of FIG.

[Explanation of symbols]

 11 Housing 12a Rotation axis 13 Eccentric shaft 13a Rotation axis 14 Wiper drive shaft 15 Link 16 Rod 18, 19 Gear 20 Spring 21 Link 17, 22, 23 Ball joint

Claims (1)

[Scope of utility model registration request] 1. An eccentric shaft that supports a eccentric shaft that rotatably supports a wiper drive shaft about its axis in a housing rotatably about an axis that forms an angle with the axis of the wiper drive shaft. In a wiper drive device in which the wiper drive shaft and the wiper drive shaft are rotated in different angular ranges, a gear that is rotated by a rod that reciprocates in conjunction with a rod that drives the wiper drive shaft and an eccentricity that meshes with the gear A wiper drive device including a gear driving a shaft.