JP6343177B2 - Wiper arm - Google Patents

Description

  The present invention relates to a wiper arm having a proximal end fixed to a pivot shaft and a distal end provided with a blade for wiping a wiping object.

  Conventionally, a vehicle such as an automobile is equipped with a wiper device for wiping off deposits attached to a wiping target. The wiper device includes a wiper arm that swings, and a blade is provided on the distal end side of the wiper arm. As such a wiper arm, for example, a technique described in Patent Document 1 is known. The wiper arm described in Patent Literature 1 includes an arm head fixed to a pivot shaft, and an arm shank attached to the arm head via a connecting shaft. The arm shank is rotatable with the connecting shaft as a fulcrum, and the blade is attached to the arm shank.

  The arm shank is provided with a first support portion, and the arm head is provided with a second support portion. A tension coil spring is provided, and the first end of the tension coil spring is hung on the first support portion. Further, a hook is provided, and the first end of the hook is hung on the second end of the tension coil spring. The second end portion of the hook is hung on the second support portion. The connecting shaft is disposed between the first support portion and the second support portion in a direction along the line of action of the elastic force of the tension coil spring.

  When the operating state where the action line of the force of the tension coil spring is located between the connecting shaft and the object to be wiped is selected as the pivot position of the arm shank, the blade is the object to be wiped by the force of the tension coil spring. Pressed against.

  When the lockback state where the center of the connecting shaft is located between the line of action of the tension coil spring and the wiping surface is selected as the pivot position of the arm shank, the blade is separated from the object to be wiped Thus, the arm shank is held.

  Further, the connecting shaft is provided with a half-moon-shaped notch, and when the lockback state is selected as the pivot position of the arm shank, the hook enters the notch. Interference can be prevented. For this reason, when the arm shank is in a lockback state, it is not necessary to bend the hook in order to avoid interference between the hook and the connecting shaft. For this reason, when the arm shank is in the reference state, the height of the wiper arm can be reduced without the hook contacting the object to be wiped.

Microfilm of Japanese Utility Model No. 63-161961 (Japanese Utility Model Publication No. 2-82656)

  However, the wiper arm described in Patent Document 1 has a problem in that a notch portion is provided in the connecting shaft in order to avoid interference between the hook and the connecting shaft, and the strength of the connecting shaft is reduced.

  The objective of this invention is providing the wiper arm which can suppress that the intensity | strength of a connection shaft falls.

The present invention is a wiper arm comprising: an arm head that operates using a pivot shaft as a fulcrum; and an arm shank provided on the arm head and attached with a blade for wiping an object to be wiped. A connecting shaft that rotatably connects the arm head in a direction in which the blade approaches or separates from the object to be wiped; a use state in which the blade contacts the object to be wiped; A case in which a blade is provided to be switched and held in a locked-back state away from the object to be wiped, and the connecting shaft is cut out in a radial direction, and the arm shank is held in the locked-back state. A recess in which the holding member is disposed, and a range including the recess in a direction along a center line of the connecting shaft, and And a reinforcing portion that protrudes outward in the radial direction from the outer peripheral surface of the connecting shaft, the connecting shaft, the outer circumferential shape by the center line perpendicular plan view is circular, the reinforcing portion, the The outer diameter of the connecting shaft is larger in plan view perpendicular to the center line, and the center of the reinforcing portion is arranged at a position different from the center line in plan view perpendicular to the center line .
The reinforcing portion of the present invention has a circular outer peripheral shape in a plan view perpendicular to the center line.

  The holding member of the present invention is a tension coil spring, and a first support portion that supports a first end portion in the expansion / contraction direction of the tension coil spring is provided on the arm shank, and a first support portion in the expansion / contraction direction of the tension coil spring is provided. A second support portion that supports two end portions is provided on the arm head, and the connecting shaft is disposed between the first support portion and the second support portion in the expansion and contraction direction of the tension coil spring. .

  The arm shank of the present invention includes a long first frame plate disposed between the connecting shaft and the blade, a long second frame plate disposed in parallel with the first frame plate, An elongated connection plate that connects the first frame plate and the second frame plate, and the tension coil spring is disposed between the first frame plate and the second frame plate.

  The present invention is provided with a beam member arranged at a distance from the connection plate and connecting the first frame plate and the second frame plate, and a part of the extension and contraction direction of the tension coil spring is It arrange | positions between a connection board and the said beam member.

  According to the wiper of the present invention, the holding member can be prevented from contacting the connecting shaft, and the strength of the connecting shaft can be increased.

It is a perspective view which shows embodiment of the wiper arm in this invention. It is a disassembled perspective view of the wiper arm of FIG. It is the bottom view which looked at the wiper arm of Drawing 1 from the front window side. It is sectional drawing which shows the principal part of the wiper arm of FIG. (A) is a perspective view of a connecting pin used for the wiper arm of FIG. 1, and (B) is a front view of the connecting pin used for the wiper arm of FIG. 1. It is front sectional drawing in which the arm shank of the wiper arm of FIG. 1 is in use. It is front sectional drawing in which the arm shank of the wiper arm of FIG. 1 exists in a lockback state.

  An embodiment in which a wiper arm of the present invention is used in a wiper device for wiping a windshield of a vehicle will be described with reference to the drawings.

  A wiper arm 10 shown in FIGS. 1 to 3, 6, and 7 wipes the surface of a front window 11 provided in a vehicle. The wiper arm 10 includes an arm head 12 and an arm shank 13. The arm head 12 is made of synthetic resin or metal, and the pivot shaft 14 is connected to the first end portion in the length direction of the arm head 12, and the arm shank 13 is connected to the second end portion in the length direction of the arm head 12. Are concatenated. The arm head 12 can swing about the pivot shaft 14 as a fulcrum. The pivot shaft 14 is connected to an electric motor through a speed reduction mechanism so as to be able to transmit power. When the power of the electric motor is transmitted to the pivot shaft 14, the pivot shaft 14 rotates forward and backward within a predetermined angle range.

  A pair of support portions 15 and 16 are provided at the second end portion of the arm head 12, and a space A <b> 1 is formed between the support portions 15 and 16. A shaft hole 17 is provided in the support portion 15, and a shaft hole 18 is provided in the support portion 16. The inner diameters of the shaft holes 17 and 18 are the same, and are arranged concentrically around the center line B1. The center line B1 does not intersect with the center line C1 of the pivot shaft 14 and extends in a direction along a plane perpendicular to the center line C1. The shaft holes 17 and 18 are circular in a plan view perpendicular to the center line B1, and a support pin 19 is provided between the shaft holes 17 and 18 and the pivot shaft 14 in the length direction of the arm head 12. Is provided. The center line of the support pin 19 is parallel to the center line B1. The support pin 19 is fixed to the pair of support portions 15 and 16, and a part of the support pin 19 in the length direction is arranged in the space A1.

  Guide grooves 20 are respectively provided in the support portions 15 and 16. The guide groove 20 is formed in an arc shape with the center line B1 as the center in a plan view perpendicular to the center line B1. Stopper walls 21 and 22 are provided at both ends of the guide groove 20, respectively.

  A synthetic rubber blade 23 is attached to the first end 13 </ b> A in the longitudinal direction of the arm shank 13. The arm shank 13 is formed of metal or synthetic resin. The arm shank 13 includes a first frame plate 24 and a second frame plate 25 that are parallel to each other, and a connection plate 26 that connects both ends of the first frame plate 24 and the second frame plate 25 in the width direction. The first frame plate 24 and the second frame plate 25 have an elongated shape, and a pair of support portions 15 and 16 are disposed between the first frame plate 24 and the second frame plate 25. Support holes 27 and 28 are provided in the second end portion 13 </ b> B in the length direction of the arm shank 13. The support hole 27 penetrates the first frame plate 24 in the thickness direction, and the support hole 28 penetrates the second frame plate 25 in the thickness direction.

  A mechanism for connecting the arm shank 13 and the arm head 12 will be described. As shown in FIG. 4, a bush 29 is disposed in the shaft hole 17, and a bush 30 is disposed in the shaft hole 18. The bushes 29 and 30 are made of metal and have a cylindrical shape. In addition, a connecting pin 31 that connects the arm head 12 and the arm shank 13 so as to be rotatable is provided. The connecting pin 31 connects the arm shank 13 and the arm head 12 so as to be rotatable in a direction in which the blade 23 approaches or separates from the front window 11.

  The connecting pin 31 is integrally formed of metal. As shown in FIG. 5A, the connecting pin 31 includes a first cylindrical portion 32 and a second cylindrical portion 33, and a reinforcing portion 34 that connects the first cylindrical portion 32 and the second cylindrical portion 33. Yes. The outer diameter of the first cylindrical portion 32 and the outer diameter of the second cylindrical portion 33 are the same, the outer diameter of the first cylindrical portion 32 is larger than the inner diameter of the support hole 27, and the outer diameter of the second cylindrical portion 33 is It is larger than the inner diameter of the support hole 28. The first cylindrical portion 32 is rotatably disposed in the bush 29, and the second cylindrical portion 33 is rotatably disposed in the bush 30. That is, the first cylindrical portion 32 and the second cylindrical portion 33 are disposed concentrically with the center line B1 as the center.

  A head portion 36 is provided on the first cylindrical portion 32 via a neck portion 35. The outer diameter of the neck portion 35 is smaller than the outer diameter of the first cylindrical portion 32, and the outer diameter of the head portion 36 is larger than the outer diameter of the neck portion 35. The neck portion 35 is disposed in the support hole 27. That is, the first frame plate 24 is disposed between the head portion 36 and the first cylindrical portion 32 in the direction along the center line B1. A head portion 38 is provided on the second cylindrical portion 33 via a neck portion 37. The outer diameter of the neck portion 37 is smaller than the outer diameter of the second cylindrical portion 33, and the outer diameter of the head portion 38 is larger than the outer diameter of the neck portion 37. The neck portion 37 is disposed in the support hole 28. That is, the second frame plate 25 is disposed between the head portion 38 and the second cylindrical portion 33 in the direction along the center line B1. The neck 35 is disposed in the support hole 27, and the neck 37 is disposed in the support hole 28. The arm shank 13 and the connecting pin 31 are integrally rotatable.

  The connection pin 31 does not move in the direction along the center line B1 with respect to the arm head 12 and the arm shank 13. Further, as shown in FIG. 5B, the reinforcing portion 34 has a circular outer peripheral shape in a plan view perpendicular to the center line B1, and the outer diameter of the reinforcing portion 34 is the first cylindrical portion 32 and the second cylindrical portion. It is larger than the outer diameter of the cylindrical portion 33. And the center D1 of the reinforcement part 34 is arrange | positioned in the position different from centerline B1 by planar view perpendicular | vertical with respect to centerline B1. That is, the reinforcing portion 34 protrudes outward in the radial direction of the connecting pin 31 from the outer peripheral surface of the first cylindrical portion 32 and the outer peripheral surface of the second cylindrical portion 33 in a plan view perpendicular to the center line B1. ing.

  Further, the connecting pin 31 is provided with a notch 39. The notch 39 is a recess provided by notching the connecting pin 31 in the radial direction. The notch 39 is formed over a predetermined range in the direction along the center line B1. The notch 39 is formed over a range including the center D1 in a plan view perpendicular to the center D1. The inner wall 40 of the notch 39 is linearly arranged in a plan view perpendicular to the center D1. That is, assuming a straight line E1 passing through the center line B1 and the center D1 in a plan view perpendicular to the center D1, the angle formed by the straight line E1 and the inner wall 40 is 90 degrees.

  The center D1 on the straight line E1 is located between the inner wall 40 and the center line B1 in a plan view perpendicular to the center line B1. The arrangement range of the reinforcing portion 34 in the direction along the center line B <b> 1 includes the arrangement range of the notch portion 39. In this way, the connecting pin 31 reinforces the portion whose strength has been reduced by the notch 39 by the reinforcing portion 34.

  In the arm shank 13, a support pin 41 is attached between the first end portion 13A and the second end portion 13B. The center line of the support pin 41 is parallel to the center line B1, and the support pin 41 is fixed to the first frame plate 24 and the second frame plate 25. A rivet 42 is provided between the support pin 41 and the support holes 27 and 28 in the length direction of the arm shank 13. The rivet 42 is disposed at a distance from the connection plate 26 and connects the first frame plate 24 and the second frame plate 25. The rivet 42 is parallel to the support pin 41. The center line of the rivet 42 is parallel to the center line B1.

  Further, the wiper arm 10 includes a tension coil spring 43 that can be expanded and contracted. The tension coil spring 43 is made of metal. The tension coil spring 43 includes a coil portion 44, a first hook portion 45 connected to the first end portion of the coil portion 44, and a rod-like portion 46 connected to the second end portion of the coil portion 44. And a second hook portion 47 formed at the end of the rod-like portion 46 opposite to the coil portion 44. The outer diameter of the rod-shaped part 46 is smaller than the arrangement range in the direction along the center line B1 of the notch part 39. The first hook portion 45 is hung on the support pin 41, and the second hook portion 47 is hung on the support pin 19. The tension coil spring 43 always generates a tensile force when it is hooked on the support pins 19 and 41. For this reason, a moment about the connecting pin 31 is applied to the arm shank 13.

  As shown in FIGS. 6 and 7, the action line F <b> 1 representing the action direction of the tensile force of the tension coil spring 43 is a straight line connecting the support pin 19 and the support pin 41. The expansion / contraction direction of the tension coil spring 43 is a direction along the action line F1. Further, as shown in FIGS. 6 and 7, a part of the rod-like portion 46 is disposed between the rivet 42 and the connection plate 26 in a plan view perpendicular to the center line B1. Further, as seen in a plan view parallel to the center line B1, as shown in FIG. 4, the rod-like portion 46 is located within the arrangement range of the notch portion 39 in the direction along the center line B1.

  Further, the first frame plate 24 and the second frame plate 25 are provided with protrusions 48, respectively. The protrusion 48 provided on the first frame plate 24 protrudes from the first frame plate 24 toward the second frame plate 25, and the protrusion 48 provided on the second frame plate 25 extends from the second frame plate 25 to the first frame. Projecting toward the plate 24. The protrusion 48 is disposed at the same position as the support holes 27 and 28 in the length direction of the arm shank 13. The protrusion 48 is disposed in the guide groove 20. When the arm shank 13 is rotated with respect to the arm head 12, the projection 48 moves in the guide groove 20 along an arcuate locus.

  Next, the control action of the wiper device provided with the wiper arm 10 will be described. In a use state where the blade 23 is in contact with the surface of the front window 11, the line of action F <b> 1 of the tension coil spring 43 is between the center line B <b> 1 and the surface of the front window 11 as shown in FIG. 6. . Therefore, a counterclockwise moment is applied to the arm shank 13 around the connecting pin 31 by the pulling force of the tension coil spring 43, and the blade 23 is pressed against the surface of the front window 11.

  When the wiper switch is turned on and the electric motor is driven, the pivot shaft 14 repeats the forward and reverse rotations within a predetermined angle range by the power of the electric motor. When the pivot shaft 14 rotates forward and backward, the wiper arm 10 reciprocates within a predetermined angle range, and the surface of the front window 11 is wiped by the blade 23. Thus, the wiper arm 10 swings around the pivot shaft 14. When the position of the wiper arm 10 changes with respect to the surface of the front window 11, the arm shank 13 rotates about the connecting pin 31 according to the change in the surface shape of the front window 11.

  On the other hand, when the vehicle is stopped during snowfall and the wiper switch is turned off, the arm shank 13 can be switched from the use state to the lockback state in order to reduce the load applied to the wiper arm 10 due to snow accumulation. When switching the arm shank 13 from the use state to the lockback state, in FIG. 6, the operator grasps the arm shank 13, and pulls the arm shank 13 against the force of the coil spring 43, so that the clock is focused on the connecting pin 31. Rotate around.

  As shown in FIG. 7, when the center line B1 is located between the action line F1 and the surface of the front window 11, the center line B1 is centered on the arm shank 13 by the force of the tension coil spring 43. A clockwise moment is applied. For this reason, the protrusion 48 contacts the stopper wall 21, and the arm shank 13 stops. Thus, the state in which the protrusion 48 is in contact with the stopper wall 21 and the arm shank 13 is stopped is the lockback state of the arm shank 13. When the arm shank 13 is held in a locked back state, the rod-like portion 46 of the tension coil spring 43 overlaps the connecting pin 31 in a plan view perpendicular to the center line B1.

  When the arm shank 13 is switched from the lockback state to the use state, the operator grasps the arm shank 13 and rotates it counterclockwise around the connecting pin 31 in FIG. Then, from the time when the action line F1 is located between the center line B1 and the surface of the front window 11, the arm shank 13 is counterclockwise about the center line B1 by the force of the tension coil spring 43. A moment is applied. Then, after the blade 23 comes into contact with the surface of the front window 11, the operator releases the arm shank 13.

  When the arm shank 13 is switched from the use state to the lockback state, or when the arm shank 13 is switched from the lockback state to the use state, depending on the rotational position of the arm shank 13 with respect to the arm head 12, the center line B1 In a vertical plan view, the rod-shaped portion 46 and the connecting pin 31 overlap each other. In the present embodiment, the notch 39 is provided in the connecting pin 31, and the rod-like portion 46 is located within the arrangement range of the notch 39 in a plan view parallel to the center line B <b> 1. Then, the connecting pin 31 rotates together with the arm shank 13. When the arm shank 13 rotates with the connecting pin 31 as a fulcrum, the rod-like portion 46 enters and exits the cutout portion 39.

  For this reason, as shown in FIG. 7, it is possible to prevent the rod-like portion 46 from contacting the connecting pin 31 in a plan view perpendicular to the center line B1. Therefore, it is not necessary to bend the shape of the tension coil spring 43 so that the rod-shaped portion 46 does not contact the connecting pin 31. For this reason, in FIG. 6, the protrusion amount of the rod-shaped part 46 with respect to the lower end of the wiper arm 10 can be relatively reduced, and the distance between the wiper arm 10 and the surface of the front window 11 can be made as small as possible. In other words, in FIG. 6, the height of the upper end of the wiper arm 10 with respect to the surface of the front window 11 can be made relatively low. Therefore, the appearance of the vehicle is improved and the visibility of the driver is improved. Furthermore, when the vehicle travels, even if the wiper arm 10 operates, it becomes difficult to receive wind resistance, and the wiping performance of the blade 23 is improved.

  Moreover, since the height of the upper end of the wiper arm 10 with respect to the surface of the front window 11 can be made relatively low, an air flow around the blade 23 is formed, and an increase in pressure difference can be prevented. Therefore, when the wiper arm 10 reciprocates and the blade 23 wipes the surface of the front window 11, it is possible to suppress the occurrence of a watering phenomenon.

  The wiper arm 10 reciprocates within a range of a predetermined angle around the pivot shaft 14, that is, between an upper reverse position and a lower reverse position. The water pulling phenomenon occurs when the blade 23 reaches the upper reversal position, and rain water or the like swept out of the wiping range by the blade 23 is generated on the back side of the blade 23 that reversely moves toward the lower reversal position. It is a phenomenon that is drawn into the wiping range again by the negative pressure.

  The arm shank 13 is provided with a rivet 42, and the strength of the arm shank 13 is increased along the operation direction of the wiper arm 10. Specifically, the bending rigidity of the arm shank 13 is enhanced by connecting the first frame plate 24 and the second frame plate 25 by the rivets 42. For this reason, even if the widths of the first frame plate 24 and the second frame plate 25 are set narrow in order to relatively reduce the height of the wiper arm 10 in the vertical direction of FIG. Along this, the strength of the arm shank 13 can be secured. The widths of the first frame plate 24 and the second frame plate 25 mean dimensions in the vertical direction of FIG.

  Furthermore, since the bending rigidity of the arm shank 13 can be increased along the operation direction of the wiper arm 10, the amount of deformation of the wiper arm 10 due to the wiping resistance of the blade 23 during the operation of the wiper arm 10 can be reduced. Therefore, it is possible to prevent stress from being concentrated on the connecting portion between the arm head 12 and the pivot shaft 14.

  Next, the manufacturing process of the wiper arm 10 will be described. In the assembly process of the wiper arm 10, before the connecting pin 31 is attached to the arm shank 13 and the arm head 12, if the connecting pin 31 is placed on a flat place such as a work table or a component box, the figure is based on the center of gravity. As shown in FIG. 5B, the center line B1 is below the center D1 and stops. For this reason, even when an operator handles a plurality of connecting pins 31, all the connecting pins 31 have the same direction in the circumferential direction, and the handling work of the connecting pins 31 becomes easy. In the step of attaching the tension coil spring 43, the first hook portion 45 is hung on the support pin 41 and the second hook portion 47 is hung on the support pin 19, and then the rivet 42 is attached to the arm shank 13. Carry out the caulking work.

  Here, the correspondence relationship between the configuration described in the present embodiment and the configuration of the present invention will be described. The front window 11 is a wiping object, the connection pin 31 is a connection shaft, and the tension coil spring 43 is a holding member. The first hook portion 45 is a first end portion, the support pin 41 is a first support portion, the second hook portion 47 is a second end portion, and the support pin 19 is a second support portion. The notch 39 is a recess, and the rivet 42 is a beam member.

  Needless to say, the wiper arm of the present invention is not limited to the above-described embodiment, and various changes can be made without departing from the scope of the invention. For example, the wiper arm of the present invention includes a wiper arm that wipes the rear window of the vehicle in addition to a wiper arm that wipes the front window of the vehicle. In this case, the connecting shaft can be made of synthetic resin instead of metal. Further, the connecting shaft and the arm head can be integrally formed of a synthetic resin without using the connecting shaft and the arm head as separate members. Furthermore, the concave portion of the present invention is a mechanism that prevents the holding member from contacting the connecting shaft when the arm shank rotates around the connecting shaft, and the concave portion of the present invention includes a notch, a groove, Including depressions.

DESCRIPTION OF SYMBOLS 10 Wiper arm 11 Front window 12 Arm head 13 Arm shank 13A 1st end part 13B 2nd end part 14 Pivot shafts 15 and 16 Support parts 17 and 18 Shaft hole 19 Support pin 20 Guide groove 21 and 22 Stopper wall 23 Blade 24 1st Frame plate 25 Second frame plate 26 Connection plates 27, 28 Support holes 29, 30 Bush 31 Connection pin 32 First column portion 33 Second column portion 34 Reinforcement portions 35, 37 Neck portion 36, 38 Head portion 39 Notch portion 40 Inner wall 41 support pin 42 rivet 43 tension coil spring 44 coil part 45 first hook part 46 rod-like part 47 second hook part 48 projection A1 space B1, C1 center line D1 center E1 straight line F1 action line

Claims (5)

A wiper arm comprising: an arm head that operates with a pivot shaft as a fulcrum; and an arm shank provided on the arm head and attached with a blade for wiping a wiping object;
A connecting shaft that connects the arm shank and the arm head so that the blade can rotate in a direction in which the blade approaches or leaves the wiping object;
A holding member that switches and holds the arm shank between a use state in which the blade contacts the wiping object and a lockback state in which the blade is separated from the wiping object;
A concave portion in which the connecting member is disposed when the connecting shaft is cut in a radial direction and the arm shank is held in the lockback state;
A reinforcing portion provided in a range including the concave portion in a direction along the center line of the connecting shaft, and projecting radially outward from an outer peripheral surface of the connecting shaft;
Equipped with a,
The connecting shaft has a circular outer peripheral shape in a plan view perpendicular to the center line,
The reinforcing portion is larger than the outer diameter of the connecting shaft in a plan view perpendicular to the center line,
The wiper arm , wherein the center of the reinforcing portion is disposed at a position different from the center line in a plan view perpendicular to the center line . The wiper arm according to claim 1, wherein
The reinforcing portion, the outer peripheral shape Ru circular der in the centerline perpendicular plan view, wiper arm. The wiper arm according to claim 1 or 2,
The holding member is a tension coil spring;
A first support portion for supporting a first end portion in the expansion and contraction direction of the tension coil spring is provided on the arm shank;
A second support portion for supporting a second end portion in the expansion and contraction direction of the tension coil spring is provided in the arm head;
The connecting shaft is a wiper arm that is disposed between the first support portion and the second support portion in the expansion and contraction direction of the tension coil spring . The wiper arm according to claim 3,
The arm shank includes a long first frame plate disposed between the connecting shaft and the blade, a long second frame plate disposed in parallel with the first frame plate, and the first A long connection plate that connects the frame plate and the second frame plate;
The tension coil spring is a wiper arm disposed between the first frame plate and the second frame plate . The wiper arm according to claim 4 ,
A beam member arranged at a distance from the connection plate and connecting the first frame plate and the second frame plate is provided;
A wiper arm , wherein a portion of the tension coil spring in the expansion / contraction direction is disposed between the connection plate and the beam member .

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