JP5022739B2 - Wiper blade - Google Patents

Description

  The present invention relates to a wiper blade that includes a rubber holder that is attached to a wiper arm provided in a vehicle and a blade rubber that is held by the rubber holder, and that wipes the window glass of the vehicle.

  A vehicle such as an automobile is provided with a wiper device for wiping off deposits such as rain, snow, insects, and splashes from a front vehicle to secure the driver's view. Such a wiper device has a wiper arm swingably driven by an electric motor and a wiper blade attached to the tip of the wiper arm. The wiper blade swings on the glass surface to wipe the glass surface. It has become so.

  A wiper blade used in such a wiper device has a rubber holder attached to the wiper arm and a rubber blade rubber held by the rubber holder. The rubber holder distributes the presser force applied from the wiper arm over the entire length of the blade rubber.For example, a tournament type that combines multiple levers, or a plate spring member that curves more strongly than the glass surface A holding type is known.

  On the other hand, the blade rubber has, for example, a base portion formed in a bar shape having a rectangular cross section and a lip portion that contacts the glass surface as disclosed in Patent Document 1. The base part is provided with a holding groove extending in the longitudinal direction, while the rubber holder is provided with a C-shaped holding part, and the base part is held in the holding part so that the tip of the holding part is engaged with the holding groove. It is inserted and held by the rubber holder.

The lip portion is connected to the base portion via a neck portion constricted in the wiping direction, and comes into contact with the glass surface at the tip portion. The neck portion is elastically deformable in the wiping direction, and the lip portion is tiltable in the wiping direction with respect to the base portion by elastic deformation of the neck portion. Further, a pair of arm portions (ridges) projecting on both sides in the wiping direction and extending in the longitudinal direction are provided between the base portion and the neck portion, and the upper surface of the lip portion is opposed to the arm portion. When the lip portion is inclined with respect to the base portion, the shoulder (shoulder portion) which is both ends of the lip portion in the wiping direction comes into contact with the arm portion so that the inclination angle of the lip portion is regulated to an appropriate angle. It has become. Accordingly, when the wiper blade is operated and the blade rubber swings together with the rubber holder, the lip portion performs a wiping operation in a state where the lip portion is inclined at an appropriate wiping angle with respect to the glass surface by the wiping resistance.
Japanese Utility Model Publication No. 7-4220

  In such a wiper blade, when the wiping direction of the wiper blade is reversed at the reversal position, the direction of the wiping resistance applied to the lip portion is also reversed, so that the lip portion tilts so as to reverse the inclination direction with respect to the base portion. However, with a wiper blade that regulates the inclination angle of the lip portion by bringing the shoulder of the lip portion into contact with the arm portion, the shoulder of the tilting lip portion strikes the arm portion of the base portion to generate a reverse sound. There was a problem.

  An object of the present invention is to reduce the inversion sound generated when the wiper blade is inverted.

A wiper blade of the present invention comprises a rubber holder attached to a wiper arm of a vehicle and a blade rubber held by the rubber holder, and is a wiper blade for wiping the window glass of the vehicle, and is provided on the blade rubber. and wherein the lip portion in sliding contact with the window glass, a base held by the holding portion provided in the rubber holder, while being connected to a shoulder provided on the upper portion of the lip portion of the lip tip than wiping direction A neck portion that is narrowly formed and is connected to the shoulder so as to be tiltable to the base portion, and protrudes on both sides in the wiping direction between the base portion and the neck portion, and is opposed to the holding portion with a predetermined interval. a pair of arm portions which, by connecting the shoulder and the arm portion provided integrally with the blade rubber, or , And a pair of buffer portions in the wiping direction being arranged on both sides of the neck portion, when the lip portion relative to the base is tilted to the wiping direction, the wiping of the pair of buffer portions The rear buffer portion in the direction is elastically deformed toward the front side in the wiping direction between the arm portion and the shoulder, and the arm portion is elastically deformed by being pushed by the shoulder.

  In the wiper blade of the present invention, the holding portion is provided with a pair of abutting portions that protrude toward the window glass and come into contact with the arm portion, and a space portion is formed between the arm portion and the holding portion. It is characterized by.

  The wiper blade of the present invention is characterized in that the arm portion has a thin portion at a portion away from the neck portion by a predetermined distance in the wiping direction.

  The wiper blade of the present invention is characterized in that the arm portion is always in contact with the contact portion.

  The wiper blade of the present invention is characterized in that the top surface of the base portion is formed to be convexly curved toward the wiping direction, and the base portion is tiltable in the wiping direction with respect to the holding portion.

  The wiper blade of the present invention is characterized in that the buffer portion is formed in a predetermined range in the longitudinal direction of the blade rubber.

  According to the present invention, when the lip portion is tilted by the reversal of the wiper blade, the buffer portion is elastically deformed between the arm portion and the shoulder, and the arm portion is elastically deformed by being pushed by the shoulder. The impact load on the part can be absorbed by the elastic deformation of the buffer part and the arm part, and the reversal noise generated by the blade rubber can be reduced.

  Further, according to the present invention, the contact portion provided on the holding portion is brought into contact with the arm portion so that the space portion is formed between the arm portion and the holding portion. Intrusion of rain, snow, foreign matter, etc. can be prevented, the operation of the wiper blade can be stabilized and its durability can be improved.

  Furthermore, according to the present invention, since the thin portion is formed in the portion away from the neck portion of the arm portion in the wiping direction, the arm portion is easily bent when the lip portion is tilted, so that the blade rubber is generated. Sound can be further reduced.

  Furthermore, according to the present invention, since the arm portion is always brought into contact with the abutting portion, it is possible to reliably prevent intrusion of rain, snow, foreign matter, etc. between the holding portion and the base portion, and the lip portion. It is possible to prevent the arm portion from hitting the holding portion during tilting and generating abnormal noise.

  Further, according to the present invention, since the base is tiltably held in the wiping direction by the holding portion, the base is tilted in the same direction as the lip portion at the time of reversal. By absorbing the impact load on the blade, the reversal noise generated by the blade rubber can be further reduced.

Also, it is possible to form the buffer portion in the longitudinal direction of the predetermined range of the blade rubber.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an explanatory view showing an outline of a wiper device provided with a wiper blade according to an embodiment of the present invention. The vehicle 11 shown in FIG. A wiper device 13 is provided for wiping off vehicle splashes and the like to ensure the driver's field of view.

  The wiper device 13 is fixed to a wiper shaft 14 a that is rotatably supported by the vehicle 11 and is rotatably supported by the vehicle 11 and a wiper arm 15 a on the driver side, that is, the DR side, provided to be swingable on the vehicle 11. And a wiper arm 15b on the front passenger seat side, that is, AS side, which is fixed to the wiper shaft 14b and is swingably provided on the vehicle 11. These wiper shafts 14a and 14b are connected to a wiper motor 17 via a link mechanism 16, and when the wiper motor 17 is operated, these wiper arms 15a and 15b swing within a predetermined angular range.

  A wiper blade 18a on the driver's seat side, that is, the DR side, is attached to the front end portion of the wiper arm 15a on the DR side, and a wiper blade 18b on the passenger side, that is, the AS side, is attached to the front end portion of the wiper arm 15b on the AS side. A spring member such as a spring (not shown) is built in the wiper arms 15a and 15b, and the wiper blades 18a and 18b are pressed against the windshield 12 by the spring members 15a and 15b by the spring members. It is like that. When the wiper arms 15a and 15b swing, the wiper blades 18a and 18b swing on the windshield 12 in the wiping ranges 12a and 12b between the upper reverse position and the lower reverse position located at the lower end of the windshield 12. The windshield 12 is wiped off.

  Next, the structure of the wiper blade will be described. Since the wiper blade 18a on the DR side and the wiper blade 18b on the AS side have basically the same structure, only the wiper blade 18a on the DR side will be described below. explain.

  2 is a partially cutaway front view showing details of the DR-side wiper blade shown in FIG. 1, and FIG. 3 is a perspective view showing details of the rubber holder shown in FIG. 4 is a sectional view taken along line AA in FIG. 2, and FIG. 5 is a perspective view showing details of the blade rubber shown in FIG.

  As shown in FIG. 2, the DR-side wiper blade 18a (hereinafter referred to as wiper blade 18a) includes a rubber holder 21 and a blade rubber 22 held by the rubber holder 21, and is separated from the windshield 12, that is, naturally. In the state, the windshield 12 is curved toward the glass surface with a smaller radius of curvature than the portion with the smallest radius of curvature in the wiping range 12a of the windshield 12.

  As shown in FIG. 3, the rubber holder 21 has a structure in which a plurality of (for example, 22 in the present embodiment) holding pieces 23 are connected in the longitudinal direction at predetermined intervals by two rod-shaped spring members 24. It has become.

  Reference numeral 25 shown in FIG. 2 is a cover formed of, for example, hard rubber and covers the rubber holder. The cover 25 is formed in a fin shape to improve the aerodynamic characteristics of the wiper blade 18a and to prevent dust. It is improving.

  As shown in FIG. 4, each holding piece 23 includes a base end wall portion 23a, a pair of side wall portions 23b that are substantially perpendicular to the base end wall portion 23a, and a pair of claw portions 23c that protrude from the side wall portions 23b. The section viewed from the axial direction is substantially C-shaped.

  Each of the rod-shaped spring members 24 has a circular cross section and is curved with a radius of curvature smaller than that of the windshield 12, and the movement direction when the wiper blades 18a wipe each other on the windshield 12, that is, They are arranged side by side in the wiping direction. Further, as shown by broken lines in FIG. 3, the rod-like spring member 24 is formed with a plurality of crank portions 24a bent in a crank shape at predetermined intervals, and each holding piece 23 is formed at the side wall portion 23b. It is fixed to the corresponding crank portion 24a. Thus, the rod-shaped spring member 24 is connected to the crank portion 24a by the holding piece 23 so that the rod-shaped spring member 24 is connected to each other by the holding piece 23 and has a predetermined rigidity in the wiping direction and in a direction perpendicular to the windshield 12. It is elastically deformable. That is, the rubber holder 21 is elastically deformable in a direction perpendicular to the glass surface so as to be along the glass surface of the windshield 12 when the rod-shaped spring member 24 is elastically deformed.

  A support block 26 is provided at a substantially central portion in the longitudinal direction of the rubber holder 21, and the rubber holder 21 is attached to a wiper arm 15 a on the DR side with a clip 27 provided on the support block 26. When a pressing force from the DR side wiper arm 15 a is applied to the support block 26, the rod-shaped spring member 24 is elastically deformed along the curved surface of the windshield 12, and the pressing force is dispersed throughout the longitudinal direction of the blade rubber 22. Is done.

  On the other hand, as shown in FIG. 5, the blade rubber 22 is formed in a bar shape whose cross section is uniform in the longitudinal direction, and is held by the rubber holder 21 at the base 31. As the material of the blade rubber 22, natural rubber, chloroprene rubber, or a material in which natural rubber and chloroprene rubber are blended so as to have the advantages of these materials are used. By injection molding these materials, It is formed.

  The base portion 31 has a top surface 31a facing the base end wall portion 23a of the holding piece 23, a pair of side surfaces 31b facing the side wall portions 23b, and a bottom surface 31c facing the claw portions 23c, respectively. The size, that is, the distance between the top surface 31a and the bottom surface 31c is slightly smaller than the distance between the base end wall portion 23a of the holding piece 23 and the claw portion 23c. The base portion 31 is inserted inside a holding piece 23 as a holding portion provided in the rubber holder 21 and is held by the holding piece 23. Further, the top surface 31a of the base 31 is formed to be convexly curved toward the wiping direction, whereby the base 31 is tilted in the wiping direction within a predetermined range with respect to the holding piece 23 inside the holding piece 23. It is free. That is, the top surface 31a of the base portion 31 is in contact with the base end wall portion 23a at a substantially central portion in the wiping direction and has a slight gap with respect to the base end wall portion 23a at both ends in the wiping direction. 31 can be tilted in a direction to fill a gap with the base end wall portion 23a on both ends of the top surface 31a.

  Furthermore, mounting grooves 31d that open in the wiping direction are provided on both side surfaces 31b of the base 31, and a vertebra 32 is mounted in these mounting grooves 31d as shown in FIG. These vertebras 32 are leaf springs having a predetermined elastic force, and the pressing force distributed by the rubber holder 21 is further evenly distributed in the longitudinal direction of the blade rubber 22 by these vertebras 32.

  On the side of the windshield 12 of the base 31, a lip portion 33 formed in a substantially triangular shape with a cross section gradually narrowing toward the windshield 12 in the wiping direction is provided. The lip portion 33 is provided with an edge end 33a for wiping the windshield 12 in contact with the windshield 12, and on the side opposite to the edge end 33a, that is, on the base 31 side, in the wiping direction with respect to the edge end 33a. A pair of shoulders 33b projecting on both sides are provided.

  A connecting portion 34 is provided on the bottom surface 31 c of the base portion 31 so as to protrude from between the claw portions 23 c toward the lip portion 33, and the width in the wiping direction is between the connecting portion 34 and the lip portion 33 with respect to the lip portion 33. A thin neck portion 35 that is sufficiently narrow is formed. The lip portion 33 is connected to the base portion 31 by a neck portion 35, and the lip portion 33 can be tilted in the wiping direction with respect to the base portion 31 by elastic deformation of the neck portion 35.

  Between the base portion 31 and the neck portion 35, a pair of arm portions 36 that protrude from the connecting portion 34 to both sides in the wiping direction are provided. These arm portions 36 are respectively disposed on the side of the windshield 12 with respect to the holding piece 23 and face the holding piece 23 with a predetermined interval in a direction perpendicular to the windshield 12. Thereby, the holding groove 37 with which the nail | claw part 23c engages with the base 31 is formed. The holding groove 37 is formed to be sufficiently wider than the thickness of the claw portion 23 c in the direction perpendicular to the windshield 12, and the claw portion 23 c contacts the bottom surface 31 c of the base portion 31, but is sufficient for the arm portion 36. They are arranged at intervals. Further, the thickness in the direction perpendicular to the windshield 12 is thinner than the base end portion in a predetermined range on the distal end side of the arm portion 36, that is, a portion away from the neck portion 35 by a predetermined distance in the wiping direction. A thin portion 36a is provided, and a tip portion of the thin portion 36a is in contact with a contact portion 38 provided on the side wall portion 23b.

  Here, the abutting portion 38 is formed to protrude toward the windshield 12 with respect to the claw portion 23 c, and a space portion 41 is formed between the arm portion 36 and the holding piece 23. Thereby, the arm part 36 can be elastically deformed in a direction in which the space part 41 is narrowed, that is, a direction perpendicular to the windshield 12, with the contact part with the contact part 38 as a fulcrum. Moreover, since the arm part 36 has the thin part 36a, it can be easily elastically deformed with a smaller load.

  Since the arm portion 36 provided on the blade rubber 22 is in contact with the abutting portion 38 of the rubber holder 21, the gap between the engaging portion between the base portion 31 and the holding piece 23, that is, each claw portion 23 c and the connecting portion 34 is not an arm. It will be covered by the part 36. Accordingly, it is possible to prevent rain, snow, foreign matter and the like from entering between the holding piece 23 and the base 31, thereby stabilizing the operation of the wiper blade 18 a and improving its durability.

  In order to reduce the reversal noise generated when the shoulder 33b of the lip portion 33 strikes the arm portion 36 when the wiper blade 18a is reversed, between the shoulder 33b and the arm portion 36 of the lip portion 33 of the blade rubber 22, respectively. A buffer 51 is provided.

  Each of the buffer parts 51 is formed in a wall shape that connects the shoulder 33b of the lip part 33 and the base end side of the arm part 36 on the corresponding side and extends along the longitudinal direction of the blade rubber 22, In the illustrated case, the buffer portion 51 is formed integrally with the blade rubber 22 over the entire range in the longitudinal direction of the blade rubber 22. When the lip portion 33 tilts in the wiping direction with respect to the base portion 31 due to elastic deformation of the neck portion 35, one buffer portion 51 in the tilting direction is pushed in a direction perpendicular to the windshield 12 by the shoulder 33b of the lip portion 33. Thus, it is bent in the wiping direction, and is elastically deformed in the direction of narrowing the gap between the shoulder 33b and the arm portion 36. At this time, the other buffer 51 extends in a direction perpendicular to the windshield 12 as the distance between the shoulder 33b and the arm 36 increases, that is, the distance between the shoulder 33b and the arm 36 is increased. It is elastically deformed in the spreading direction.

  6A is a cross-sectional view showing the state of the blade rubber when the wiper blade moves from the lower reverse position toward the upper reverse position, and FIG. 6B shows the wiper blade from the upper reverse position to the lower reverse position. It is sectional drawing which shows the state of a blade rubber at the time of moving toward.

  When the wiper blade 18a having the above-described structure is attached to the wiper arm 15a and the pressing force from the wiper arm 15a is applied to the support block 26, the rubber holder 21 is elastically deformed in accordance with the curvature of the windshield 12, and the wiper blade 18a. The blade rubber 22 is deformed so that the entire longitudinal direction of the blade rubber 22 is in contact with the windshield 12. As described above, the pressing force from the wiper arm 15a is applied to the blade rubber 22 while being distributed in the longitudinal direction via the rubber holder 21, and the blade rubber 22 contacts the windshield 12 with a predetermined distributed pressure characteristic. Will do.

  Next, the action of the arm portion 36 and the buffer portion 51 when the wiper blade 18a performs the wiping operation will be described with reference to FIGS.

  When a wiper switch (not shown) is turned on when the wiper blade 18a is at the stop position, that is, the lower reverse position, the wiper motor 17 starts operating. When the wiper motor 17 is actuated, the wiper blade 18a moves from the lower inversion position toward the upper inversion position as shown in FIG. 6A, and then the movement direction is inverted at the upper inversion position. As shown in b), it moves from the upper inversion position toward the lower inversion position. Then, when reaching the lower inversion position, the moving direction is reversed again, and the same operation is repeated thereafter. As a result, the lip portion 33 of the blade rubber 22 moves while being in contact with the windshield 12, and the wiping operation is performed.

  When the wiper blade 18a starts the wiping operation, the lip portion 33 is subjected to frictional resistance with the windshield 12, that is, wiping resistance. Therefore, the lip portion 33 is predetermined with respect to the base portion 31 by elastic deformation of the neck portion 35. The windshield 12 is wiped at the edge end 33a. For example, when the wiper blade 18a moves from the lower inversion position toward the upper inversion position, as shown in FIG. 6A, the lip portion 33 is inclined toward the lower inversion position side with respect to the base portion 31, and the wiper When the blade 18a moves from the upper reversal position toward the lower reversal position, as shown in FIG. 6 (b), the lip portion 33 is inclined to the opposite side to the case shown in FIG. 6 (a) with respect to the base portion 31. To do.

  Thus, since the wiper blade 18a reciprocates between the reversal positions, the inclination direction of the lip portion 33 is suddenly switched at each reversal position, whereby the lip portion 33 abruptly changes with respect to the base portion 31. Will tilt.

  However, in the wiper blade 18a, the buffer portion 51 is provided between the shoulder 33b of the lip portion 33 and the arm portion 36. Therefore, when the lip portion 33 tilts during reversal, FIG. , (B), the shock absorber 51 is pushed by the shoulder 33b and elastically deforms the shock absorber 51 between the shoulder 33b and the arm portion 36, whereby the impact load applied to the arm portion 36 by the lip portion 33 is applied. It will be absorbed by the buffer 51. That is, the buffer portion 51 functions as a damper that absorbs an impact load between the lip portion 33 and the arm portion 36, and absorbs the impact load applied to the arm portion 36 by the shoulder 33b of the lip portion 33 to reduce the load. It is.

  Further, in this wiper blade 18a, a space 41 is formed between the arm portion 36 and the holding piece 23. Therefore, when the lip portion 33 tilts during reversal, as shown in FIGS. 6 (a) and 6 (b). Further, the arm portion 36 is elastically deformed in a direction in which the space portion 41 is narrowed by being pushed by the shoulder 33b, that is, a direction in which the inclination of the lip portion 33 is allowed to be further increased. Thereby, the impact load applied by the lip portion 33 toward the arm portion 36 is also absorbed by the elastic deformation of the arm portion 36. That is, the buffer portion 51 is elastically deformed by the tilt of the lip portion 33, and the arm portion 36 is further elastically deformed so as to absorb the load applied from the shoulder 33 b of the lip portion 33 via the buffer portion 51. Thereby, in addition to the buffer part 51, the arm part 36 also functions as a damper, and the impact load applied to the arm part 36 by the shoulder 33b of the lip part 33 is further reduced. In particular, since the thin portion 36a is provided on the distal end side of the arm portion 36, the arm portion 36 is elastically deformed more flexibly when a load is applied, and can effectively absorb the impact load. .

  Further, in the wiper blade 18a, the base 31 is formed so that the top surface 31a is curved, so that the base 31 can be tilted in the wiping direction with respect to the holding piece 23. Due to the load, the base portion 31 is inclined with respect to the holding piece 23 in the same direction as the lip portion 33. Therefore, the load applied to the lip portion 33 is absorbed even when the base portion 31 tilts.

  As described above, in the wiper blade 18a, the elastic deformation of the arm portion 36 and the buffer portion 51 can absorb a shocking load applied to the arm portion 36 by the lip portion 33 at the time of reversal, so that the blade rubber 22 is generated. Inverted sound can be reduced. Thereby, the noise in the operation holding | maintenance of the wiper apparatus 13 can be reduced.

  Moreover, since the impact load which the lip part 33 applies to the arm part 36 at the time of inversion can be absorbed, the load applied to the neck part 35 at the time of inversion is reduced, and the durability of the neck part 35, that is, the blade rubber 22 is improved. In addition, noise and judder (vibration) due to poor contact of the lip portion 33 can be reduced.

  Further, in the wiper blade 18a, the contact portion 38 is sufficiently protruded from the side wall portion 23b toward the windshield 12, or the pair of arm portions 36 are formed sufficiently long in the wiping direction with respect to the contact portion 38, respectively. By doing so, the arm portion 36 is always in contact with the contact portion 38 even when wiping or stopping. Thereby, even if it is a case where it inclines with respect to the holding | maintenance piece 23 at the time of wiping, an opening part is not formed between the rubber holder 21 and the blade rubber 22, and the penetration | invasion of the foreign material to the inside of the rubber holder 21 is prevented. be able to.

  On the other hand, even when the wiper blade 18a is moving in a predetermined direction, the load applied to the lip portion 33 may fluctuate due to a change in wiping resistance or the like. It may leave behind or cause abnormal noise.

  On the other hand, in the wiper blade 18a, even when the wiper blade 18a is wiping in a predetermined direction, the lip portion 33 has its shoulder 33b in contact with the arm portion 36 via the buffer portion 51 and is inclined. Therefore, the arm portion 36 and the buffer portion 51 are elastically deformed according to the variation in the load applied to the lip portion 33, and the variation in the load on the lip portion 33 is absorbed. Therefore, even if the load applied to the lip portion 33 fluctuates due to fluctuations in wiping resistance, the lip portion 33 can always contact the windshield 12 with an appropriate load, and the wiper blade 18a can perform a good wiping operation. it can.

  7A to 7C are perspective views showing modifications of the blade rubber shown in FIG.

  In the blade rubber 22 shown in FIG. 4, the buffer portion 51 has a wall shape that connects the shoulders 33 b of the lip portion 33 and the arm portion 36 and is integrally formed with the blade rubber 22. ), The shock absorber 51 is formed separately from the blade rubber 22 by a shock absorbing material such as sponge, and is fixed to a predetermined position of the blade rubber 22 by an adhesive means such as an adhesive or a fixing means. You may make it do.

  The buffer 51 is not limited to the wall shape connecting the shoulder 33b and the arm 36. For example, as shown in FIG. 7B, the buffer 51 is directed from the shoulder 33b of the lip 33 toward the arm 36. As a protruding wall shape, it may be formed integrally with the shoulder 33b. For example, as shown in FIG. 7C, the buffer 51 protrudes from the arm portion 36 toward the shoulder 33b of the lip portion 33. It may be formed integrally with the arm portion 36 as a wall shape. Further, even in these cases, each buffer portion 51 is formed separately from the blade rubber 22 with a shock absorber such as a sponge, and a predetermined position of the blade rubber 22 by an adhesive means such as an adhesive or a fixing means. You may make it fix to.

  It goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, in the above-described embodiment, the rubber holder 21 includes the holding piece 23 and the rod-shaped spring member 24. However, the rubber holder 21 is not limited to this, and is a so-called tournament type configured by assembling a plurality of levers. A so-called two-point type in which the blade rubber 22 is held at two points by a pair of holding portions provided at both ends of the wiper blade provided with a rubber holder and a rubber holder formed to be approximately half the length of the blade rubber 22. The present invention may be applied to other types of wiper blades such as a wiper blade having a rubber holder. In these cases, the buffer portion 51 is not limited to the entire length of the blade rubber 22, but the buffer portion 51 is provided only in the portion where the holding portion is provided. The buffer portion 51 may be provided only in this range.

  In the above-described embodiment, the present invention is applied to the wiper blade 18a in the tandem wiper device 13. However, the present invention is not limited to this, and other types such as the AS-side wiper blade 18b and the counter-wiping type are also used. You may apply to the other wiper blade used for a wiper apparatus.

It is explanatory drawing which shows the outline of the wiper apparatus provided with the wiper blade which is one embodiment of this invention. FIG. 2 is a partially cutaway front view showing details of a DR-side wiper blade shown in FIG. 1. It is a perspective view which shows the detail of the rubber holder shown in FIG. It is sectional drawing which follows the AA line in FIG. FIG. 3 is a perspective view showing details of a blade rubber shown in FIG. 2. (A) is sectional drawing which shows the state of a blade rubber at the time of a wiper blade moving from a lower inversion position toward an upper inversion position, (b) is a wiper blade moving from an upper inversion position toward a lower inversion position It is sectional drawing which shows the state of the blade rubber at the time of doing. (A)-(c) is a perspective view which shows the modification of the blade rubber shown in FIG. 4, respectively.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Vehicle 12 Windshield 12a, 12b Wiping range 13 Wiper apparatus 14a, 14b Wiper axis | shaft 15a DR side wiper arm 15b AS side wiper arm 16 Link mechanism 17 Wiper motor 18a DR side wiper blade 18b AS side wiper blade 21 Rubber holder 22 Blade Rubber 23 Holding piece 23a Base end wall portion 23b Side wall portion 23c Claw portion 24 Rod spring member 24a Crank portion 25 Cover 26 Support block 27 Clip 31 Base portion 31a Top surface 31b Side surface 31c Bottom surface 31d Mounting groove 32 Vertibra 33 Lip portion 33a Edge end 33b Shoulder 34 Connecting portion 35 Neck portion 36 Arm portion 36a Thin portion 37 Holding groove 38 Abutting portion 41 Space portion 51 Buffer portion

Claims (6)

A wiper blade comprising a rubber holder attached to a wiper arm of a vehicle and a blade rubber held by the rubber holder, the wiper blade wiping the window glass of the vehicle,
A lip portion provided on the blade rubber and in sliding contact with the window glass;
A base portion held by a holding portion provided in the rubber holder;
A neck portion connected to a shoulder provided at the upper portion of the lip portion and having a width in the wiping direction narrower than a tip end of the lip portion, the neck portion being tiltably connected to the base portion,
A pair of arm portions provided between the base portion and the neck portion so as to protrude on both sides in the wiping direction and facing the holding portion at a predetermined interval;
A pair of buffer portions provided integrally with the blade rubber to connect the arm portion and the shoulder , and disposed on both sides of the neck portion in the wiping direction ;
When the lip portion is tilted in the wiping direction with respect to the base portion, the rear buffer portion in the wiping direction of the pair of buffer portions is between the arm portion and the shoulder in the wiping direction. A wiper blade characterized by elastically deforming toward the front side and elastically deforming the arm portion by being pushed by the shoulder.   2. The wiper blade according to claim 1, wherein the holding portion is provided with a pair of abutting portions that protrude toward the wind glass and come into contact with the arm portion, and a space portion is formed between the arm portion and the holding portion. A wiper blade characterized by   3. The wiper blade according to claim 1, wherein the arm portion has a thin portion at a portion away from the neck portion by a predetermined distance in the wiping direction. 4.   4. The wiper blade according to claim 2, wherein the arm portion is always in contact with the contact portion.   The wiper blade according to any one of claims 1 to 4, wherein the top surface of the base portion is formed to be convexly curved toward the wiping direction, and the base portion is tilted in the wiping direction with respect to the holding portion. A wiper blade characterized by freedom. The wiper blade according to any one of claims 1 to 5, wherein the buffer portion is formed in a predetermined range in a longitudinal direction of the blade rubber .

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