JPH01257643A - Wiper device - Google Patents

Abstract

PURPOSE:To reduce the whole construction to a compact size by providing a support incorporating a hydraulic pressure supply source including a piston reciprocated by a cam mechanism in a wiper device where a wiper arm is connected to a pivot shaft supported on a fixed support through a hydraulic expansion mechanism. CONSTITUTION:An expansion hydraulic cylinder 5 is connected to the upper portion of a pivot shaft 8 rotatably supported on a support 6 fixed to a car body through a swivel joint 7, and a base end arm portion 4b of a wiper arm 4 is connected to the forward end of a piston rod 18. Then, liquid pressure is supplied from a hydraulic pressure supply source 10 to the hydraulic cylinder 5 to be expanded and contracted In this case, the hydraulic pressure supply source 10 comprises a bottomed cylinder hole 33 disposed on the support 6, coaxially surrounding the pivot shaft 8, a piston 36 fitted therein and a cam mechanism 37 for reciprocating the piston 36 according to the movement of the pivot shaft 8, and the cam mechanism 37 comprises a cam face 46 and plural rollers 47.

Description

Detailed Description of the Invention A1 Object of the Invention (]) Industrial Field of Application The present invention provides a hydraulic telescopic device that operates to expand and contract in response to hydraulic pressure on a pivot shaft that is rotatably supported on a fixed support. The present invention relates to a wiper device in which a wiper blade is connected via a mechanism, and a hydraulic pressure supply source is connected to the hydraulic expansion/contraction mechanism.

(2) Prior Art Conventionally, such devices have been disclosed in Japanese Patent Application Laid-Open No. 53-98635, for example.
It is publicly known from the publication No.

(3) Problems to be Solved by the Invention By the way, in the above conventional wiper arm, the wiper arm is constituted by a cylinder mechanism, and a hydraulic cylinder is actuated by a cam that rotates in relation to the reciprocating rotation of the wiper arm, and the hydraulic The wiper arm is extended and retracted by supplying hydraulic pressure from the cylinder to the cylinder mechanism, but the hydraulic pressure from the hydraulic cylinder located away from the pivot shaft is connected to the cylinder mechanism via a conduit such as a hose. Since the wiper arm is connected to the wiper arm, a hydraulic circuit for extending and retracting the wiper arm is required in addition to a mechanism for reciprocating the wiper arm, which is not very space efficient.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a wiper device that is compactly configured and has improved space efficiency.

B0 Configuration of the Invention (1) Means for Solving the Problems According to the present invention, the hydraulic pressure supply source includes a bottomed cylinder hole coaxially surrounding the pivot shaft and provided in the support body; A hydraulic chamber is formed between the end plate that closes the open end and the closed end of the cylinder hole by slidingly contacting the inner peripheral surface with the outer peripheral surface of the pivot shaft and slidingly contacting the outer peripheral surface with the inner peripheral surface of the cylinder hole. A cam mechanism is provided between the end plate and the piston for axially moving the piston in response to rotation of the pivot shaft.

(2) Effect According to the above configuration, the volume of the hydraulic chamber is expanded and contracted by driving the piston in the axial direction according to the rotational movement of the pivot shaft, and the hydraulic pressure from the hydraulic pressure chamber is reduced. The hydraulic expansion and contraction mechanism expands and contracts by supplying the hydraulic pressure to the expansion and contraction mechanism, and since the hydraulic pressure supply source is provided in the support, the overall structure becomes compact.

(3) Embodiment An embodiment of the present invention will be described with reference to the drawings. First, in FIG. 1, a single wiper device 2 for wiping a windshield 1 of a passenger vehicle This wiper device W2 wipes almost the entire surface of the windshield 1 as indicated by the chain line.

In FIGS. 2 and 3, the wiper device 2 includes a wiper arm 4 having a wiper blade 3 at the tip end for wiping the windshield 1, and a hydraulically extendable wiper arm 4 connected to the base end of the wiper arm 4. A hydraulic cylinder 5 for expansion and contraction as a mechanism, a support 6 fixed to the vehicle body (not shown) below the approximately central portion of the windshield 1, and supported rotatably by the support 6, with the upper part being a swivel a pivot shaft 8 connected to the telescopic hydraulic cylinder 5 via an inlet 7; a support member 9 fastened to the upper end of the pivot shaft 8 and connected to the telescopic hydraulic cylinder 5; A hydraulic pressure supply source lO for supplying hydraulic pressure to the engine, a drive source 11 fixedly supported on a vehicle body (not shown), and a link mechanism 13 interposed between the drive source 11 and the pivot shaft 8.

The wiper arm 4 includes a distal end arm portion 4a connected to a rotatable tip of the wiper blade 3 for wiping the windshield 1, and a proximal arm portion 4b connected to a telescoping hydraulic cylinder 5. , are connected via a toggle mechanism 14, and the distal end arm portion 4a has two states: a state in which the wiper blade 3 is in sliding contact with the windshield l, and a state in which the wiper blade 3 is moved away from the windshield l. It is connected to the proximal arm portion 4b so as to be bendable between the two states, and both of the above states are elastically held by the toggle mechanism 14.

The telescopic hydraulic cylinder 5 includes a cylindrical cylinder body 15,
A plug body 16 that closes one end of the cylinder body 15, and a plug body 1
6, a piston 1 slidably fitting within the cylinder body 15 to define a hydraulic chamber 20 within the cylinder body 15;
7, a piston rod 18 coaxially connected to the piston 17 and passing through the plug 16 in an axially movable and oil-tight manner, and a return spring compressed between the plug 16 and the screw I/217. 19, and a cylindrical swivel joint 7 having an axis perpendicular to the axis of the cylinder body 15 is integrally connected to the other end of the cylinder body 15.

The base arm portion 4b of the wiper arm 4 has a substantially U-shaped cross section to cover the telescopic hydraulic cylinder 5, and the tip of the piston rod 18 is located near the tip of the base arm portion 4b. Concatenated. Therefore, as the telescopic hydraulic cylinder 5 is extended, the wiper arm 4 is also extended, and as the telescopic hydraulic cylinder 5 is retracted, the wiper arm 4 is also retracted.

A pivot shaft 8 is rotatably supported on a support 6 fixed to the vehicle body, with its upper and lower parts protruding from the support 6. In addition, at the upper part of the pivot shaft 8 that protrudes upward from the support 6, there is a swivel joint 7 that is integrated with the cylinder body 15 of the telescopic hydraulic cylinder 5.
are fitted so that they can rotate relative to each other. In addition, retaining rings 21 and 22 are fitted to the pivot shaft 8 and come into contact with the lower and upper surfaces of the swivel joint 7, so that the telescopic hydraulic cylinder 5 can be rotated around the axis of the pivot shaft 8. It will be supported by the pivot shaft 8.

A tapered serration portion 23 is provided on a portion of the pivot shaft 8 that projects upward from the swivel joint 7, and the cover 24 is attached to the pivot shaft above the support member 9 that fits into the serration portion 23 from above. The support member 9 and the cover 24 are fixed to the pivot shaft 8 by fitting the nut 25 into the portion of the pivot shaft 8 that protrudes upward from the cover 24 and tightening the nut 25 .

The support member 9 has a pair of guide rods 26, 26 extending in parallel on both sides of the hydraulic cylinder 5, and these guide rods 26, 26 include a plurality of guide rods 26, 26 that protrude from the inner surface of the proximal arm portion 4b. The guide arm portion 27 of is fitted. As a result, when the telescopic hydraulic cylinder 5 is extended or retracted, the base end arm portion 4b of the wiper arm 4 is extended or retracted while being guided by the guide rods 26, 26. Moreover, the rotational movement of the pivot shaft 8 is transmitted from both guide ronds 26, 26 of the support member 9 to the base end arm portion 4b via the guide arm portion 27, whereby the wiper arm 4 is rotated.

The drive source 11 includes a motor 29 supported and fixed on a fixed support plate 28, and a reducer 30 connected to the motor 29 to reduce the output of the motor 29. Reducer 30
A rotary arm 31 is fixed to the output shaft 30a of the rotary arm 31, and this rotary arm 31 and a lever 32 fixed to the lower end of the pivot shaft 8 are connected via a link mechanism 13.

The link mechanism 13 is configured to convert the rotational movement of the rotary arm 31 into a rotational movement of the pivot shaft 8. Therefore, when the motor 29 is operated, the pivot shaft 8 rotates, and the rotational movement is As the motion is transmitted from the support member 9 to the wiper arm 4, the wiper blade 3 reciprocates within a certain range while wiping the surface of the windshield 1.

The hydraulic pressure supply source 10 includes a bottomed cylinder hole 33 that coaxially surrounds the pivot shaft 8 and is provided in the support 6, an end plate 34 that closes the open end of the cylinder hole 33, and a pivot shaft that covers the inner peripheral surface. The cylinder hole 3 is brought into sliding contact with the outer peripheral surface of the shaft 8 and the outer peripheral surface is brought into sliding contact with the inner peripheral surface of the cylinder hole 33.
A piston 36 defining a hydraulic chamber 35 between the closed end of the piston 36 and the closed end of the piston 36
and a cam mechanism 37 provided between the end plate 34 and the piston 36 to move the piston 36 in the axial direction in response to rotation of the pivot shaft 8.

The cylinder hole 33 is opened at the lower end of the support body 6.
An end plate 34 is provided at the lower end opening of the cylinder hole 33.
are fitted, and the end plate 34 is prevented from falling out of the cylinder hole 33 by a retaining ring 38 fitted to the inner surface of the lower end of the cylinder hole 33. The pivot shaft 8 passes through the end plate 34 via the sleeve 39, so that the end plate 34 remains fixed regardless of the rotational movement of the pivot shaft 8. The pivot shaft 8 also coaxially passes through the piston 36, but a spline 40 extending in the axial direction is cut into the pivot shaft 8 at a portion corresponding to the piston 36, and this spline 40 allows the pivot shaft 8 and the piston to 36, it is connected to allow relative movement in the axial direction while preventing relative rotation around the same axis.

A sealing member 41 that comes into sliding contact with the inner surface of the cylinder hole 33 is fitted onto the outer surface of the piston 36 .
A sliding member 42 made of synthetic resin is fitted to reduce the sliding resistance with the inner surface of 3. Further, a sealing member 43 that is in sliding contact with the outer surface of the pivot shaft 8 is fitted onto the inner surface of the piston 36 . Furthermore, a sliding member 44 for reducing sliding resistance with the pivot shaft 8 passing through the upper part of the support body 6 is disposed on the upper part of the support body 6 so as to be in sliding contact with the outer surface of the pivot shaft 8. A sealing member 45 is interposed between the upper end of the pivot shaft 6 and the pivot shaft 8 .

In FIG. 4, the cam mechanism 37 includes a cam surface 46 provided on the upper surface of the end plate 34, and a plurality of rollers 47 that are pivotally supported at the lower end of the piston 36 so as to be in sliding contact with the cam surface 46. Ru. The cam surface 46 is formed in a wave shape along its circumferential direction, and each roller 47 is rotatably supported by the piston 36 so as to be movable on the cam surface 46. In such a cam mechanism 37, the piston 36 rotates in response to the rotation of the pivot shaft 8, so that the roller 47 moves against the cam surface 4.
6, thereby driving the piston 36 in the axial direction.

The axial movement of the piston 36 causes the volume of the hydraulic chamber 35 to expand and contract repeatedly, and hydraulic pressure is generated in the hydraulic chamber 35.

The hydraulic pressure generated in the hydraulic pressure chamber 35 is supplied to the telescopic hydraulic cylinder 5, and a passage 48 communicating with the hydraulic pressure chamber 35 is bored in the upper part of the pivot shaft 8. Further, at a position corresponding to the swivel joint 7, an annular groove 49 communicating with the passage 48 is provided on the outer surface of the pivot shaft 8, and a communication passage 50 communicating with the annular groove 49 is bored in the swivel joint 7. Furthermore, the communication passage 50 is bored coaxially with the axis of the cylinder body 15 so as to communicate with the hydraulic chamber 20 in the telescoping hydraulic cylinder 5. Further, seal members 51 and 52 are fitted into the inner surface of the swivel joint 7 so as to sandwich the annular groove 49 therebetween and slide into sliding contact with the outer surface of the pivot shaft 8 at positions spaced apart in the axial direction.

A connecting member 5 with a built-in check valve 53 is provided on the upper part of the support 6.
4 are connected, and the external open end of the connecting member 54 is closed with a plug member 55. This connecting member 54 is connected to the hydraulic chamber 3
This is used when injecting hydraulic oil into 5.

Next, to explain the operation of this embodiment, the drive source 11
Power is transmitted to the pivot shaft 8 via the link mechanism 13, and the rotation of the pivot shaft 8 causes the wiper arm 4 to rotate via the support member 9.

Moreover, in the hydraulic pressure supply source 10, as the piston 36 rotates together with the pivot shaft 8, the piston 36 is driven in the axial direction by the action of the cam mechanism 37, and the axial movement of the piston 36 causes the hydraulic pressure chamber 35 to The hydraulic pressure generated in is supplied to the hydraulic chamber 20 of the telescopic hydraulic cylinder 5 via the passage 48, the annular groove 49 and the communicating passage 50, and the hydraulic pressure generated in the telescopic hydraulic cylinder 5 changes as the hydraulic pressure acting on the end surface of the piston 17 changes. 5 operates to expand and contract.

Therefore, the wiper arm 4 rotates around the axis of the pivot shaft 8 and also expands and contracts, so that the tip of the wiper blade 3 touches the left and right side edges and the upper edge of the windshield 1 as shown by the chain lines in FIG. The wiper blade 3 moves along the windshield 1, covering almost the entire surface of the windshield 1.
It will be wiped clean.

In such a wiper device 2, the hydraulic pressure source lO is connected to the support 6
Since it is installed in the area, the overall structure is compact. Moreover, since the hydraulic pressure from the hydraulic pressure supply source 10 can be supplied to the telescopic hydraulic cylinder 5 through the passage 48 in the pivot shaft 8, a conduit such as a hose can be made unnecessary.

In another embodiment of the invention, the end plate 34 may be connected to the pivot shaft 8 in a manner that prevents relative rotation, but allows relative rotation between the pivot shaft 8 and the piston 36.

In addition, in the above embodiment, the wiper device 2 is arranged at the lower center of the windshield 1 and wipes almost the entire surface of the windshield 1.
It is also applicable to a pair of left and right wiper devices arranged to wipe the left and right sides separately.

C2 Effect of the Invention As described above, according to the present invention, the hydraulic pressure supply source closes the bottomed cylinder hole provided in the support body coaxially surrounding the pot shaft and the open end of the cylinder hole. an end plate;
A piston having an inner circumferential surface in sliding contact with an outer circumferential surface of a pivot shaft and an outer circumferential surface in sliding contact with an inner circumferential surface of a cylinder hole to define a hydraulic chamber between the piston and the closed end of the cylinder hole; Since the piston is provided with a cam mechanism provided between the end plate and the piston to move the piston in the axial direction in response to rotation, the hydraulic pressure supply source can be configured within the support body and the whole can be made compact.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a front view showing how the wiper device is installed on a passenger vehicle, FIG. 2 is a vertical side view of the wiper device, and FIG. The cross-sectional plan view, FIG. 4, is a view taken along the line IV-IV in FIG. 2.

Claims (1)

[Claims] A wiper blade is connected to a pivot shaft rotatably supported by a fixed support via a hydraulic expansion mechanism that expands and contracts in response to hydraulic pressure, and a hydraulic pressure supply source is connected to the hydraulic expansion mechanism. In wiper systems, the hydraulic pressure source is
A bottomed cylinder hole coaxially surrounding the pivot shaft and provided in the support body, an end plate that closes the open end of the cylinder hole, and an inner circumferential surface that is in sliding contact with the outer circumferential surface of the pivot shaft, and an outer circumferential surface that is A piston that slides on the inner circumferential surface of the cylinder hole to define a hydraulic chamber between the closed end of the cylinder hole, and an end plate and piston that move the piston in the axial direction according to the rotation of the pivot shaft. A wiper device comprising: a cam mechanism provided in between.