JPH01257646A - Wiper device - Google Patents

Abstract

PURPOSE:To surely prevent leakage of a liquid by connecting a hydraulic expansion mechanism to a pivot shaft through a bellows communicated with a hydraulic pressure source in a wiper device where a wiper arm is connected to the pivot shaft supported on a fixed support through the hydraulic expansion mechanism. CONSTITUTION:In a wiper device where a hydraulic expansion mechanism 5 is connected through a swivel joint 7 to the upper portion of a pivot shaft 8 rotatably supported on a support 6, a support member 9 having a pair of guide rods 28 extended in the direction of intersecting perpendicularly to the axis of the pivot shaft 8 is disposed on the upper end of the pivot shaft 8. A guide arm portion 29 on the base end arm portion 4b side of a wiper arm 4 is engaged with each guide rod 28, whereby sliding of the wiper arm 4 is guided. A hydraulic expansion mechanism 5 is constructed so that each one end of an outer cylinder 19 and a rod 17 are connected to the base end arm portion 4b of the wiper arm 4 and the base end portion of a bellows 15 partitioning a liquid pressure chamber is rotatably connected and fixed to the pivot shaft 8.

Description

Detailed Description of the Invention A9 Object of the Invention (1) Industrial Field of Application The present invention provides a hydraulic telescoping 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 wiper blade is connected through the i side, and the hydraulic pressure supply source is hydraulic expansion '4'? This invention relates to a wiper device connected to a J 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 conventional wiper arm described above, the wiper arm is constituted by a hydraulic cylinder, and the hydraulic cylinder is rotatably driven and telescopically operated. Since rotational force relative to the wiper arm is applied to the sliding portion of the hydraulic cylinder, it is inevitable that hydraulic oil will leak from the sliding portion after long-term use.

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 prevents leakage of hydraulic fluid from a hydraulic expansion/contraction mechanism.

B. Structure of the Invention (1) Means for Solving the Problems According to the first feature of the present invention, a wiper arm having a wiper blade at its tip is connected to a support member fixed to a pivot shaft by the axis of the pivot shaft. The hydraulic telescoping mechanism has a bellows that communicates the interior with a hydraulic pressure source and is interlocked and connected to the wiper arm so as to be rotatable on the pivot shaft. Concatenated.

According to the second feature of the present invention, the guide tube housing the bellows is rotatably supported by the pivot shaft, and the rod that abuts the closed end of the bellows and is inserted into the guide tube is connected to the wiper arm. be done.

Further, according to a third feature of the present invention, the hydraulic pressure source includes a bag body that is capable of being inflated and deflated by forming a pump chamber therein that communicates with the bellows, and a drive member that causes the bag body to be inflated and deflated. Equipped with.

(2) Effect According to the first feature, the hydraulic expansion and contraction mechanism is configured so that the bellows expands and contracts in response to changes in the supplied hydraulic pressure, so there are no sliding parts, thus preventing leakage of hydraulic fluid. can do. Moreover, since the wiper arm having the wiper blade is supported by a support member fixed to the pivot shaft, no force for rotating the wiper arm is applied to the flexible bellows, and the bellows is expanded and contracted. is carried out smoothly.

According to the second feature, the bellows is expanded and contracted within the guide cylinder, thereby avoiding contact of other members with the bellows and preventing deformation of the bellows due to such contact.

Furthermore, according to the third feature of the present invention, since the hydraulic pressure supply source also generates hydraulic pressure by the expansion and contraction of the bag, there are no sliding parts and leakage of the hydraulic fluid can be prevented.

(3) Embodiment An embodiment of the present invention will now 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 The wiper device 2 is disposed at the lower center, and 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 mechanism 5, a support 6 fixed to the vehicle body (not shown) below the approximately central portion of the windshield 1, and the support 6 rotatably supported, and the upper part of the support 6 is connected to the liquid via a swivel joint 7. A pivot shaft 8 connected to the compression expansion/contraction mechanism 5, a support member 9 fastened to the upper end of the pivot shaft 8 and connected to the hydraulic expansion/contraction mechanism 5, and a support member 9 for supplying hydraulic pressure to the hydraulic expansion/contraction mechanism 5. a hydraulic pressure supply source 10, a drive source 11 fixedly supported on a vehicle body (not shown), a cam mechanism 12 interposed between the drive source 11 and the hydraulic pressure supply source 10, and a drive source 11 and a pivot shaft 8. link mechanism 13 interposed in
Equipped with.

The wiper arm 4 includes a distal end arm portion 4 a rotatably connected to the distal end of the wiper blade 3 for wiping the windshield 1 , and a proximal arm portion 4 b connected to the hydraulic expansion/contraction mechanism 5 . , are connected via a toggle mechanism 14, and the tip arm portion 4a can be used in a state in which the wiper blade 3 is in sliding contact with the windshield l, and in a state in which the wiper blade 3 is separated from the windshield 1.
1. It is connected to the proximal arm portion 4b so as to be bendable between the pins, and both of the above states are elastically maintained by the toggle mechanism 14.

The hydraulic expansion/contraction mechanism 5 includes a bellows 15 formed into a bottomed cylindrical shape with a hydraulic chamber 23 inside, a guide cylinder 16 surrounding the bellows 15, and an inner end connected to the closed end of the bellows 15. A rod 17 that is inserted into the guide tube 16 in contact with each other, a spring 18 that biases the rod 17 in a direction to contract the bellows 15, and an outer tube 19 that surrounds the guide tube 16 (n. The tube 16 is connected to a cylindrical swivel joint 7 having an axis perpendicular to the axis of the inner tube 16 .

Referring also to FIG. 4, the guide tube 16 has a locking collar 16a at one end and is formed into a cylindrical shape, and the other end of the guide tube 16 is closed with a closing member 20. Further, the hollows 15 is formed into a cylindrical shape with a bottom and has a clamping crocodile 15a at its open end. On the other hand, the swivel joint 7 is provided with a connecting protrusion 7a, and the clamping collar 15a and the locking collar 16a are sequentially overlapped and brought into contact with the ring 2I that is in contact with the end surface of the connecting protrusion 7a. In this state, the guide cylinder 16 is connected to the swivel joint 7 by screwing the cap nut 22 which can be held on the locking collar 16a into the connecting protrusion 7a and tightening it.

The rod 17 passes through the closing member 20 in an axially movable manner, and the rod 17 has a disc-shaped sliding portion 17a at the inner end that contacts the closed end of the bellows 15 and slides against the inner surface of the guide tube 16. will be provided. Moreover, the spring 18 is
The bellows 15 is compressed between the closing member 20 and the sliding portion 17a, surrounding the rod 17, and the rod 17 is urged inward in the axial direction by the spring force of the spring 1B. It is urged in a direction to contract the hydraulic pressure chamber 23 therein.

The base end arm portion 4b of the wiper arm 4 has an outer cylinder 19.
The rod 1 is formed into a substantially U-shaped cross section to cover the rod 1.
The outer end of 7 is connected with the outer cylinder 19 to a portion near the tip of the 39% end portion 4b.

Therefore, as the hydraulic expansion/contraction mechanism 5 extends, the wiper arm 4 also extends, and as the hydraulic expansion/contraction mechanism 5 contracts, the wiper arm 4 also contracts.

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. Moreover, a swivel joint 7 is fitted into the upper part of the pivot shaft 8 projecting upward from the support body 6 so as to be relatively rotatable. Further, a retaining ring 24 that comes into contact with the upper surface of the swivel joint 7 is fitted to the pivot shaft 8, so that the hydraulic expansion/contraction mechanism 5 can be rotated around the axis of the pivot shaft 8 and attached to the pivot shaft 8. It will be supported.

A tapered serrated portion 25 is provided on the portion of the pivot shaft 8 that protrudes upward from the swivel joint 7, and the cover 26 is pivoted above the support member 9 that fits into the serrated portion 25 from above. ) - The support member 9 and the cover 26 are fixed to the pivot shaft 8 by fitting into the shaft 8 and screwing a nut 27 onto a portion of the pivot shaft 8 that protrudes upward from the cover 26 and tightening it.

The support member 9 has a pair of guide rods 2B, 28 extending in parallel in a direction orthogonal to the axis of the pot shaft 8 on both sides of the hydraulic expansion/contraction mechanism 5, and these guide rods 28.
A plurality of guide arm portions 29 that protrude from the inner surface of the base end arm portion 4b are fitted into the guide arm portions 28 . As a result, when the hydraulic expansion/contraction mechanism 5 is extended/contracted, the base end arm portion 4b of the wiper arm 4 is
It expands and contracts while being guided by guide rods 28 and 28.

Moreover, the rotational movement of the pivot shaft 8 is transmitted from both guide rods 28, 28 of the support member 9 to the proximal arm part 4b via the guide arm part 29, and thereby the wiper arm 4
rotates.

The drive source 11 includes a motor 31 supported and fixed on a fixed support plate 30, and a reducer 32 connected to the motor 31 to reduce the output of the motor 31. Reducer 32
A rotating plate 33 is fixed to the output shaft 32a of the rotary plate 33, and the rotating plate 33 and a lever 34 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 plate 33 into a rotational movement of the pivot shaft 8. Therefore, when the motor 31 is actuated, the pot shaft 8 rotates, and the rotation of the pot shaft 8 rotates. As the dynamic 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 l.

The hydraulic pressure supply source IO includes a bag body 35 formed of an elastic material such as rubber so as to be able to expand and contract, a drive member 36 for driving the bag body 35 to expand and contract, and an external shape of the bag body 35. and a casing 37 that regulates the movement of the drive member 36 and guides the movement of the drive member 36, and generates hydraulic pressure, that is, oil pressure, when the bag body 35 expands and contracts.

The casing 37 consists of a funnel-shaped body 38 and an end plate 39 coupled to the funnel-shaped body 38, and the end plate 39 is fixed and supported by the support plate 30. The funnel-shaped body 38 has a large diameter cylindrical portion 38a.
The end plate 39 is formed into a funnel shape by a tapered portion 38b having a large diameter end connected to one end of the large diameter cylindrical portion 38a, and a small diameter cylindrical portion 38C connected to a small diameter end of the tapered portion 38b.
is coupled to the open end of the funnel-shaped body 38, that is, the outer end of the large diameter cylindrical portion 38a. The bag body 35 also includes a bag-like part 35a that contacts the inner surfaces of the large-diameter cylindrical part 38a and the tapered part 38b of the funnel-like body 38 to form a pump chamber 40 therein, and a small-diameter cylindrical part 38c of the funnel-like body 38. It consists of a neck part 35b which is connected to the bag-like part 35a so as to be inserted into the bag, and a clamping collar part 35c which is provided at the outer end of the neck part 35b so as to come into contact with the outer end surface of the small diameter cylindrical part 38C. On the other hand, at one end of the conduit 41 for supplying the hydraulic pressure generated in the pump chamber 40 to the hydraulic expansion/contraction mechanism 5, there is a locking member that clamps the clamping flange 35c between the outer end surface of the small diameter cylindrical part 38c. A collar 41a is provided, and by screwing and tightening a cap nut 42 that can be secured to the locking collar 41a to the small diameter cylindrical portion 38c, the bag body 35 is fixed to the casing 37 and the hydraulic pressure of the conduit 41 is fixed. Connection to source 10 is achieved.

The driving member 36 has a large diameter cylindrical portion 38 in the funnel-shaped body 3 days.
It slides without being guided by the inner surface of the bag (formed in a disc shape and fitted into the casing 37, and by driving this drive member 36 in the axial direction, the volume of the bag body 35, that is, the volume of the pump chamber 40 is changed. Change.

The cam mechanism 12 consists of a cam surface 43 provided on the outer peripheral surface of the rotary plate 33 and a drive rod 44 whose one end is in sliding contact with the cam surface 43 as a cam follower.
passes through the center of the end plate 39 in the hydraulic pressure supply StO so as to be freely movable in the axial direction, and is connected to the drive member 36. Therefore, the rotation of the rotary plate 33 causes the drive rod 44 to reciprocate in the axial direction, thereby pumping the hydraulic pressure source 10.

A conduit 41 leading to the pump chamber 40 is connected to the lower part of the support 6 and communicates with a communication passage 45 bored in the lower part of the support 6. On the other hand, the pivot shaft 8 is formed in a hollow shape so as to coaxially form a passage 46 whose upper and lower ends are closed, and this passage 46 and the communication passage 45 are formed between the support body 6 and the pivot shaft 8. They are communicated via a swivel joint 47. That is, while the support body 6 is fixed to the vehicle body, the pivot shaft 8 is rotatably supported by the support body 6, so that the lower outer surface of the pivot shaft 8 has an annular groove 48 that communicates with the passage 46. is provided, and the communication path 45 always communicates with the annular groove 48. Furthermore, sealing members 49 and 50 are fitted into the inner surface of the support body 6 at positions spaced apart in the axial direction so as to sandwich the annular groove 48 therebetween, and which are in sliding contact with the outer surface of the pivot shaft 8.

Further, an annular groove 51 communicating with the passage 46 is provided on the outer surface of the pivot shaft 8 at a position corresponding to the swivel joint 7, and a communication passage 52 communicating with the annular groove 51 is bored in the swivel joint 7.

Moreover, the communication passage 52 is bored in the connecting protrusion 7a so as to communicate with the hydraulic chamber 23 in the hydraulic expansion/contraction mechanism 5. Further, seal members 53 and 54 are fitted into the inner surface of the swivel joint 7 so as to sandwich the annular groove 51 therebetween and slide into sliding contact with the outer surface of the pivot shaft 8 at positions spaced apart in the axial direction.

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, the rotational power of the rotary plate 330 is transmitted to the hydraulic pressure supply source 10 while being converted into axial power by the cam mechanism 12, and the bag body 35 expands in accordance with the axial movement of the drive member 36.
The hydraulic pressure generated in the pump chamber 40 due to contraction is supplied from the pipe line 41 to the hydraulic chamber 23 of the hydraulic expansion and contraction mechanism 5 via the communication passage 46, annular groove 48, passage 45, annular groove 51, and communication passage 52. The bellows 15 is guided by the guide cylinder 16 and expands and contracts in response to changes in the supplied hydraulic pressure. 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 wipes almost the entire surface of the windshield 1.

In such a wiper device 2, the hydraulic expansion/contraction mechanism 5 moves the bellows 15 into the interior cylinder 16 according to changes in the hydraulic pressure in the internal hydraulic pressure chamber 23.
Since it is configured to extend and contract while being guided, there are no sliding parts where hydraulic pressure may leak, and therefore hydraulic leakage can be reliably prevented. Furthermore, by surrounding the bellows 15 with the guide tube 15, it is possible to avoid other members from coming into contact with the bellows 15, and to prevent the bellows 15 from deforming. Moreover, since the rotation of the pivot shaft 8 is transmitted to the wiper arm 4 via the support member 9, the rotation force does not act on the hydraulic expansion/contraction mechanism 5 using the flexible bellows 15, and the bellows 15 twists can be avoided.

Furthermore, since the hydraulic pressure supply source 10 is configured to operate the pump by compressing or expanding the bag body 35 with the driving member 36, there is a possibility that the hydraulic pressure leaks as in the hydraulic expansion/contraction mechanism 5. Therefore, it is possible to avoid oil pressure leakage in the entire hydraulic system and always obtain desired operation even during long-term use.

In the above embodiment, the wiper device 2 was described as being disposed at the lower center of the windshield 1 and wiping almost the entire surface of the windshield 1, but the present invention wipes the left and right sides of the windshield 1 separately. It is also possible to apply the present invention to a pair of left and right wiper devices that are arranged in a similar manner.

C2 Effects of the Invention As described above, according to the first feature of the present invention, the wiper arm having the wiper blade at the tip is moved in the direction perpendicular to the axis of the pivot shaft by the support member fixed to the pivot shaft. The hydraulic telescoping mechanism is rotatably connected to the pivot shaft with a bellows that communicates with the hydraulic pressure source and is connected to the wiper arm. To prevent leakage of hydraulic pressure in an expansion and contraction mechanism, and to prevent twisting of the bellows by avoiding the force for rotating the wiper arm from acting on the flexible bellows. I can do it.

According to the second feature of the present invention, the guide tube housing the bellows is rotatably supported by the pivot shaft, and the rod that abuts the closed end of the bellows and is inserted into the guide tube is connected to the wiper arm. Therefore, it is possible to prevent other members from coming into contact with the bellows and to prevent deformation other than expansion and contraction from occurring in the bellows.

Furthermore, according to a third feature of the invention, the hydraulic pressure source is configured to expand by forming therein a pump chamber communicating with the bellows.
Since it includes a deflated bag and a drive member that inflates and deflates the bag, it is possible to prevent leakage of hydraulic pressure at the hydraulic pressure supply source and prevent leakage of hydraulic pressure throughout the hydraulic system. can be prevented as much as possible.

[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 an enlarged view of the main part of FIG. 2. 2... Wiper device, 3... Wiper blade, 4
...Wiper arm, 5...Hydraulic expansion and contraction mechanism, 6...
- Support body, 8... Pivot shaft, 9... Support member, 10... Hydraulic pressure supply source, 15... Bellows, 16
...Guide tube, 17...Rod, 35...Bag body, 3
6... Drive member, 40... Pump chamber

Claims (3)

[Claims] (1) The 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 the hydraulic pressure supply source is connected to the hydraulic expansion mechanism. In the connected wiper device, a wiper arm having a wiper blade at its tip is supported by a support member fixed to a pivot shaft so as to be movable in a direction perpendicular to the axis of the pivot shaft, and a hydraulic expansion/contraction mechanism is provided. A wiper device, characterized in that the wiper device is rotatably connected to a pivot shaft, and has a bellows that is interlocked and connected to the wiper arm by communicating the interior with a hydraulic pressure supply source. (2) A guide tube that houses the bellows is rotatably supported on a pivot shaft, and a rod that abuts the closed end of the bellows and is inserted into the guide tube is connected to the wiper arm. The wiper device described in item 1). (3) The hydraulic pressure supply source is characterized by comprising a bag that can be inflated and deflated by forming a pump chamber therein that communicates with the bellows, and a drive member that causes the bag to inflate and deflate. The wiper device according to item (1) or item (2).