JPWO2008126406A1 - Wiper blade rubber and wiper blade - Google Patents

Abstract

A wiper blade rubber and a wiper blade rubber capable of absorbing a change in the curvature of a window glass for each vehicle type as well as changing the curvature of a wiping range while sharing a vertebra as much as possible and obtaining a good wiping performance. To provide the wiper blade used. A first neck portion 7 and a second neck portion 9 are provided between a base portion 10 and a wiping portion 6, and are further connected between the first neck portion 7 and the second neck portion 9. Since the heel portion 8 is arranged, if the first neck portion 7 is elastically deformed and bent by a predetermined amount, the second neck portion 9 is elastically deformed and bent through the heel portion 8, so that wiping is performed. The amount of vertical movement of the base 10 can be increased within a predetermined contact angle range with good performance. For this reason, even if the window glass has a different curvature depending on the wiping position or the window glass has a different curvature for each vehicle type, the change in curvature can be absorbed, and good wiping performance can be maintained. [Selection] Figure 3

Description

  The present invention relates to a wiper blade rubber used for wiping raindrops, dust and the like, and particularly in a moving body such as an automobile, for example, a wiper blade rubber used for a windshield and a wiper blade using the wiper blade rubber. About.

  In a vehicle such as an automobile, a wiper device for wiping raindrops, dust and the like adhering to the windshield surface is used in order to secure a front view. This wiper device is configured by connecting a wiper arm to a wiper blade that transmits a driving force for reciprocating the wiper blade in an arc shape.

  Conventionally, a connecting bracket having a tournament structure is widely used for connecting a wiper arm to a wiper blade. In the wiper blade having this tournament structure, for example, as shown in FIG. 19 (8-point support type is shown), a plurality of points in the longitudinal direction of the wiper blade 301 are supported by gripping portions 351 of the connection fitting 350. Therefore, the pressing force from the wiper arm is distributed to each grip portion 351 and acts on the wiper blade rubber 302. Thereby, the wiper blade of a tournament structure can maintain favorable wiping performance even when the curvature of the surface to be wiped varies depending on the position to be wiped, such as an automobile window glass.

Also, without using the tournament structure connection bracket as described above, a so-called flat structure is used in which the connection bracket with the wiper arm is attached to the center of the wiper blade, and the pressing force from the wiper arm acts on the center of the wiper blade. Are known (see, for example, Patent Document 1, Patent Document 2, and Patent Document 3).
Japanese translation of PCT publication No. 2001-502638 (FIG. 1). JP-A-6-340249 (FIG. 1). Japanese translation of PCT publication No. 2003-525800 (FIGS. 1 to 3).

  However, as shown in FIG. 19, in the case of a wiper blade having a tournament structure, it is easy to maintain good wiping performance even when the curvature of the surface to be wiped varies depending on the position to be wiped, such as a window glass of an automobile. In addition, a plurality of gripping portions are provided in the longitudinal direction, and a plurality of connection fittings are required, resulting in a complicated structure and high cost. Moreover, since the appearance is not smart, it is desirable to reduce the number of gripping portions of the connection fitting and the number of steps of the connection fitting while maintaining good wiping performance.

  On the other hand, the wiper blade having a flat structure as described in Patent Documents 1 to 3 is preferable in terms of cost and aesthetics because it does not have a tournament connection fitting. Further, this wiper blade having a flat structure has a structure that can correspond to a surface to be wiped having a different curvature depending on a position to be wiped by changing its thickness, width and curvature in the longitudinal direction of the vertebra attached to the base. However, when used for a window glass of an automobile having a different curved surface shape for each vehicle type, there is a problem that a vertebra having a thickness, width, and curvature adjusted for each window glass must be prepared.

  For this reason, the management of the vertebra at the time of manufacture becomes complicated, and also in the so-called aftermarket, it is necessary to prepare a wiper blade having a vertebra adjusted for each window glass, and the inventory management is complicated. There is a problem that becomes.

  Further, even if a wiper blade having a flat structure is provided with a vertebra adjusted for each window glass, the change in curvature of the surface to be wiped may not be sufficiently absorbed, and further improvement in wiping performance is required.

  In view of such circumstances, the present invention provides a wiper blade having a tournament structure, and a wiper blade rubber capable of reducing the number of gripping portions of the connection fitting and a wiper blade using the wiper blade rubber. And

  In addition, the wiper blade with a flat structure can share the vertebra as much as possible, absorb the change in the curvature of the window glass as well as the change in the curvature of the wiping range, and obtain a good wiping performance. And a wiper blade using the wiper blade rubber.

  In order to achieve the above object, a wiper blade rubber according to a main aspect of the present invention is a wiper blade rubber for wiping a surface to be wiped, and a lip portion for wiping the surface to be wiped on one end side and a lip portion on the other end side. A wiping portion having a shoulder portion, a collar portion with which the shoulder portion can abut, a base portion with which the collar portion can abut, a first neck portion connecting the wiping portion and the collar portion, It comprises a second neck part that connects the collar part and the base part and has a bending rigidity different from the bending rigidity of the first neck part.

  One aspect of the present invention is characterized in that the second neck portion has a bending rigidity higher than that of the first neck portion.

  According to one aspect of the present invention, the first neck portion and the second neck portion are provided between the base portion and the wiping portion, and further connected between the first neck portion and the second neck portion. When the first neck portion is elastically deformed and bent a predetermined amount, the shoulder portion of the wiping portion comes into contact with the collar portion, and the second neck portion is interposed via the collar portion. The amount of movement of the base portion in the vertical direction can be increased within a predetermined contact angle range that is elastically deformed and bent and has good wiping performance. For this reason, even if the window glass has a different curvature depending on the wiping position or the window glass has a different curvature for each vehicle type, the change in curvature can be absorbed, and good wiping performance can be maintained.

  Further, since the bending stiffness of the second neck portion is higher than the bending stiffness of the first neck portion, the first neck portion bends before the second neck portion, and the shoulder portion of the inclined wiping portion is wrinkled. The second neck portion can be bent by contacting the portion.

  Further, when the contact angle is an angle, for example, approximately 60 °, the shoulder portion of the wiping portion comes into contact with the heel portion, so that the first neck portion itself is not further bent, and stable wiping performance can be obtained. At the same time, when a higher pressing force is applied, the second neck portion is bent by the force from the shoulder portion of the wiping portion, and the wiping portion can be inclined more greatly by inclining the collar portion. As a result, the amount of vertical movement of the base can be increased within a predetermined contact angle range with good wiping performance, and the curvature of a window glass having a different curvature depending on the wiping position or a window glass having a different curvature for each vehicle type can be obtained. The change can be absorbed and good wiping performance can be maintained.

  One form of the present invention is characterized in that the second neck portion has a bending rigidity lower than that of the first neck portion.

  According to one aspect of the present invention, the first neck portion and the second neck portion are provided between the base portion and the wiping portion, and further connected between the first neck portion and the second neck portion. When the second neck portion is elastically deformed and bent by a predetermined amount, the shoulder portion of the collar portion comes into contact with the base portion, and the inclination of the collar portion is restricted. The amount of movement of the base portion in the vertical direction can be increased within a predetermined contact angle range in which the neck portion of the base plate is elastically deformed and bent. For this reason, even if the window glass has a different curvature depending on the wiping position or the window glass has a different curvature for each vehicle type, the change in curvature can be absorbed, and good wiping performance can be maintained.

  In addition, since the bending stiffness of the first neck portion is higher than that of the second neck portion, the second neck portion bends ahead of the first neck portion, and the shoulder portion of the inclined heel portion becomes the base portion. The second neck portion can be bent because it is in contact with and the inclination of the collar portion is restricted.

  Further, when the contact angle becomes a certain angle, for example, approximately 60 °, the shoulder portion of the buttock comes into contact with the base portion, so that the second neck portion itself does not bend any more and stable wiping performance can be obtained. When a higher pressing force is applied, the first neck portion is bent, so that the wiping portion can be inclined more greatly. As a result, the amount of vertical movement of the base can be increased within a predetermined contact angle range with good wiping performance, and the curvature of a window glass having a different curvature depending on the wiping position or a window glass having a different curvature for each vehicle type can be obtained. The change can be absorbed and good wiping performance can be maintained.

  One aspect of the present invention is characterized in that the lip portion does not substantially deform in the width direction of the wiping portion during a reciprocating wiping operation. Thereby, only a lip part is prevented from bending and the whole wiping part falls down and it inclines with respect to a to-be-wiped surface. Therefore, the amount of movement of the base in the vertical direction within the range of the contact angle with good wiping performance can be increased, and the change in the curvature of the surface to be wiped can be easily followed.

  A wiper blade rubber according to another aspect of the present invention is a wiper blade rubber for wiping a surface to be wiped, and has a lip portion for wiping the surface to be wiped on one end side and a shoulder portion on the other end side. A flange that can be contacted by the shoulder, a base that can be contacted by the flange, a first neck that connects the wiping portion and the flange, and the flange and the base. And a second neck portion having a thickness in the width direction different from the thickness in the width direction of the first neck portion.

  One embodiment of the present invention is characterized in that the second neck portion has a thickness in the width direction that is thicker than a thickness in the width direction of the first neck portion.

  According to one aspect of the present invention, since the thickness in the width direction of the second neck portion is larger than the thickness in the width direction of the first neck portion, the first neck portion is the second neck portion. It becomes possible to bend by elastic deformation before the neck portion. Furthermore, since the shoulder portion of the inclined wiping portion abuts on the collar portion, the second neck portion can be bent, and the second neck portion can be reliably bent by the collar portion, so that excellent wiping performance is achieved. Can be secured.

  In one embodiment of the present invention, the thickness in the width direction of the second neck portion is 1.6 times or more and 4 times or less than the thickness in the width direction of the first neck portion. It is characterized by. As a result, when the shoulder portion of the wiping portion comes into contact with the collar portion and the pressure is further increased, the second neck portion can be elastically deformed and begin to bend, and the followability to the surface to be wiped is improved. Thus, good wiping performance with different curvatures can be maintained. If the wall thickness is less than 1.6 times, the second neck portion is bent together when the first neck portion is bent, and good wiping performance cannot be maintained. On the other hand, if the wall thickness is larger than four times, the second neck portion is not sufficiently bent and the followability to the surface to be wiped is deteriorated.

  One embodiment of the present invention is characterized in that the second neck portion has a thickness in the width direction that is thinner than a thickness in the width direction of the first neck portion.

  According to the embodiment of the present invention, the thickness in the width direction of the second neck portion is thinner than the thickness in the width direction of the first neck portion, so the second neck portion is the first neck. It becomes possible to bend by elastic deformation before the part. Furthermore, since the corner | angular part of the inclined collar part contact | abuts to a base part, a 1st neck part can be bent, it becomes possible to bend a 1st neck part reliably and the outstanding wiping performance can be ensured.

  In one embodiment of the present invention, the thickness in the width direction of the first neck portion is 1.6 times or more and 4 times or less than the thickness in the width direction of the second neck portion. It is characterized by. As a result, when the corner portion of the collar portion comes into contact with the base portion and the pressure further increases, the first neck portion can be smoothly elastically deformed and bend, and the followability to the surface to be wiped can be improved. It is possible to maintain good wiping performance at different curvatures. If the wall thickness is less than 1.6 times, the first neck portion is bent together when the second neck portion is bent, and good wiping performance cannot be maintained. On the other hand, if the wall thickness is larger than four times, the first neck portion is not sufficiently bent and the followability to the surface to be wiped is deteriorated.

  In one embodiment of the present invention, the lip portion has a parallel portion having a substantially constant thickness in the width direction, and the length of the parallel portion is 1 mm or less or the thickness is 0.8 mm or more. Characterize. As a result, the deformation at the lip portion is restricted, and the angle formed by the center line of the wiping portion and the surface to be wiped can be reduced due to the fall of the entire wiping portion, and the vertical direction as the wiping portion It is possible to increase the amount of change in.

  That is, the entire wiping portion can be inclined to the glass surface without falling down only by the lip portion. Therefore, the amount of movement of the base in the vertical direction within the range of the contact angle with good wiping performance can be increased, and the change in the curvature of the surface to be wiped can be easily followed.

  If the length of the parallel part is greater than 1 mm or the thickness is less than 0.8 mm, the boundary between the tapered part and the parallel part tends to bend, and the contact angle is within a range where good wiping performance can be obtained. The amount of movement of the base in the vertical direction becomes small, the change in the curvature of the surface to be wiped cannot be followed, and sufficient wiping performance cannot be ensured.

  In one embodiment of the present invention, the length in the center line direction connecting the first neck portion and the wiping portion is longer than the length in the center line direction connecting the second neck portion and the collar portion. It is characterized by. Here, each amount of movement of the base in the vertical direction due to the inclination of the wiping portion or the heel portion with respect to the surface to be wiped is expressed by the respective (center line length) × (1-Sin (the center line and the surface to be wiped Angle)). Therefore, in order to increase the movement amount of the base in the vertical direction, it is necessary to increase the length of the center line or to reduce the angle formed by the center line and the surface to be wiped. When the angle is large and the angle between the center line and the surface to be wiped is small, the amount of movement becomes the largest.

  Therefore, if the first neck part is bent elastically before the second neck part, the contact angle with respect to the surface to be wiped will eventually be smaller than the collar part. The base portion is moved in the vertical direction within the range of the contact angle in which the length of the first neck portion and the wiping portion is longer than the length of the second neck portion and the collar portion, and the wiping performance is good. The amount can be increased, and it becomes easier to follow the change in the curvature of the surface to be wiped. In addition, even when the second neck part is elastically deformed and bent before the first neck part, the contact angle with respect to the surface to be wiped is finally smaller than the collar part, The amount of movement in the vertical direction of the base within the contact angle range in which the length of the first neck portion and the wiping portion is longer than the length of the second neck portion and the collar portion is good. Can be increased, and the change in the curvature of the surface to be wiped can be easily followed.

  One embodiment of the present invention is characterized in that an angle formed between the surface to be wiped and the center line of the lip portion is formed by bending due to elastic deformation of the first neck portion and the second neck portion. . As a result, if the bending moment acting on the first neck portion and the second neck portion is reduced, the angle formed between the surface to be wiped and the center line of the lip portion is elastically increased accordingly and is always appropriate. Wiping performance can be achieved.

  One embodiment of the present invention is characterized in that the angle is about 30 ° or more and about 60 ° or less. Thereby, desirable wiping performance can be obtained. For example, if the angle is larger than 60 degrees, there is a case where a desired wiping performance cannot be obtained due to sound or chatter phenomenon, and if it is smaller than 30 degrees, raindrops on the window glass surface can be removed. The thick water film that remains cannot interfere with the driver's view.

  A wiper blade according to another aspect of the present invention includes the above-described wiper blade rubber and a vertebra provided in the base portion.

  The present invention is provided with a wiper blade rubber capable of following a wide range of changes in the curvature as well as corresponding to the specific curvature of the surface to be wiped by providing the base with a vertebra, so that the curvature of the wiping range can be reduced. It is possible to provide a wiper blade that can absorb the change in the curvature of the window glass for each vehicle type and obtain good wiping performance.

  A wiper blade according to another aspect of the present invention is a wiper blade that wipes a surface to be wiped by a wiper arm, the wiper blade rubber described above, a vertebra provided in the base, and a length direction of the base. It is provided in a substantially central part and comprises a connecting part for connecting the wiper arm.

  A wiper blade according to another aspect of the present invention comprises the above-described wiper blade rubber, a vertebra provided in the base, and a tournament fitting for gripping the base in a plurality of positions in the length direction. .

  Since the present invention is provided with a wiper blade rubber capable of following a wide range of changes in the curvature of the surface to be wiped, the one using the tournament structure fitting can reduce the number of places to be gripped, It is possible to simplify the structure of the connection fitting to reduce the cost and to clean the appearance.

As described above, according to the present invention, the flat structure wiper blade can absorb the change in the curvature of the window glass for each vehicle type as well as the change in the curvature of the wiping range while sharing the vertebra as much as possible. It is possible to provide a wiper blade rubber and a wiper blade that can obtain a proper wiping performance.
In addition, a wiper blade having a tournament structure can provide a wiper blade rubber capable of reducing the number of gripping portions of the connection fitting while maintaining good wiping performance. Further, by using this wiper blade rubber, it is possible to provide a wiper blade that is economical and excellent in appearance.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description of the embodiments, the wiper blade rubber will be mainly described, and a wiper blade using the wiper blade rubber will also be described.

  (First embodiment)

  1 is a schematic perspective view of a wiper blade according to a first embodiment of the present invention, FIG. 2 is a schematic perspective view of a wiper blade rubber, FIG. 3 is a sectional view taken along line AA in FIG. 2, and FIG. It is sectional drawing of the wiper blade rubber which has a top fin in the upper part. In the description of the wiper blade rubber 2, as shown in FIG. 2, the X axis direction is the "longitudinal direction" of the wiper blade rubber 2, the Y axis direction is the "width direction" of the wiper blade rubber 2, and the Z axis direction is It is defined as “up and down direction” of the wiper blade rubber 2.

  (Configuration of wiper blade)

  For example, as shown in FIG. 1, the wiper blade 1 includes a wiper blade rubber 2, a pair of vertebras 3a and 3b for imparting predetermined elasticity and rigidity (torsional rigidity and lateral rigidity) to the wiper blade rubber 2, and the wiper blade 1 in an arc shape. And a wiper arm connecting portion 5 as a connecting portion for connecting a wiper arm 4 for transmitting a driving force for reciprocating movement.

  The wiper blade rubber 2 is made of an elastic body such as rubber, and is formed in a long shape as shown in FIGS. 2 and 3, for example, and includes a wiping portion 6 for wiping a surface to be wiped such as a windshield of an automobile. The first neck portion 7 connected to the wiping portion 6, the flange portion 8 connected to the first neck portion 7, the second neck portion 9 connected to the flange portion 8, and the second neck And a base portion 10 connected to the portion. That is, the first neck part 7 is located between the wiping part 6 and the collar part 8 and is connected to both, and the second neck part 9 is located between the collar part 8 and the base part 10 and is connected to both. It has a structure to do.

  Here, the wiping part 6 has a substantially inverted triangular cross section as shown in FIG. 3, for example, and is formed in the longitudinal direction (X-axis direction in FIG. 3). 11 has a base end portion 12 on the opposite side of the lip portion 11 and shoulders 13 and 13 at both ends in the width direction (Y-axis direction in FIG. 3).

  For example, as shown in FIG. 3, the lip portion 11 has a substantially rectangular cross section, and includes a parallel portion 11a and an edge 11b. Therefore, when the wiper blade rubber 2 is pressed against the surface to be wiped by the pressing force from the wiper arm 4, the wiping portion 6 is pressed, and the center line of the lip portion 11 is about 30 ° with respect to the surface to be wiped. Therefore, the edge 11b of the lip portion 11 properly comes into contact with the surface to be wiped.

  As will be described later, the wiping portion 6 does not bend (does not fall down) with respect to the center line of the base end portion 12 even when a high pressing force is applied to a part of the wiping portion 6. It has a certain degree of rigidity.

  For example, as shown in FIG. 3, the first neck portion 7 has a substantially quadrangular cross section and is formed in the longitudinal direction (X-axis direction in FIG. 3). One side of the quadrilateral is formed at the base end portion 12 of the wiping portion 6. The other end side opposite to the one end side is integrally connected to the lower surface 8a of the heel part 8 on the wiping part 6 side. Further, the first neck portion 7 is configured so that the bending stiffness in the width direction (bending resistance in the width direction) is smaller than the bending rigidity in the width direction (bending resistance in the width direction) of the second neck portion 9. The width of the first neck portion 7 (in the Y-axis direction in FIG. 3) is, for example, about 0.5 mm.

  Further, the first neck portion 7 has an angle formed between the center line of the lip portion 11 of the wiping portion 6 and the surface to be wiped when the shoulder portion 13 of the wiping portion 6 contacts the lower surface 8a of the flange portion 8, for example, approximately 60. The length of the first neck portion 7 in the vertical direction (Z-axis direction in FIG. 3) is set to, for example, about 0.8 mm so that the angle is.

  For example, as shown in FIG. 3, the collar portion 8 has a substantially rectangular cross section and is formed in the longitudinal direction (X-axis direction in FIG. 3), and the other end side of the first neck portion 7 is substantially at the center of the lower surface 8a. The second neck portion 9 is integrally connected to the substantially center of the upper surface 8b that is integrally connected and the surface of the flange portion 8 opposite to the wiping portion 6 side. In addition, the width direction size of the flange portion 8 is such that the second neck portion 9 bends in the width direction by elastic deformation by the pressing force from the base portion 10 as will be described later, and the corner portion 8c of the upper surface 8b of the flange portion 8 is. Is formed smaller than the size in the width direction of the base portion 10 so as to be able to come into contact with the surface of the base portion 10 on the flange portion side.

  For example, as shown in FIG. 3, the second neck portion 9 has a substantially quadrangular cross section and is formed in the longitudinal direction (X-axis direction in FIG. 3). One end, which is one side, is integrally connected, and the other end opposite to the one end is integrally connected to the flange side surface of the base 10. In addition, the bending stiffness in the width direction (bending resistance in the width direction) of the second neck portion 9 is configured to be larger than the bending rigidity in the width direction (bending resistance in the width direction) of the first neck portion 7. The width of the second neck portion 9 (Y-axis direction in FIG. 3) is, for example, about 1.15 mm.

  Further, the second neck portion 9 is formed when the shoulder portion 13 of the wiping portion 6 is in contact with the lower surface 8a of the flange portion 8 and the corner portion 8c of the flange portion 8 is in contact with the surface of the base portion 10 on the flange portion side. The length of the second neck portion 9 in the vertical direction (Z-axis direction in FIG. 3) so that the angle formed by the center line of the lip portion 11 of the wiping portion 6 and the surface to be wiped is, for example, approximately 30 °. Is, for example, about 1 mm.

  As a result, when the wiper blade rubber 2 is pressed against the surface to be wiped by the pressing force from the wiper arm 4 and the wiping portion 6 is pressed, the first of the lower bending rigidity in the width direction is first applied as described later. It becomes possible for the neck portion 7 to be elastically deformed and bent in the width direction, and the second neck portion 9 having the next higher bending rigidity in the width direction to be elastically deformed and bent in the width direction.

  Further, for example, as shown in FIG. 3, the base 10 has a substantially rectangular cross section and is formed in the longitudinal direction (X-axis direction in FIG. 3). (Axial direction) has locking grooves 10a, 10a, and has vertebra mounting grooves 10b, 10b above the locking grooves 10a, 10a. For example, as shown in FIG. 3, the vertebra bra mounting grooves 10b are provided on the left and right sides in the width direction, and the vertebra 3a and 3b can be mounted in the vertebra bra mounting grooves 10b and 10b, respectively.

  Similarly, the locking grooves 10a and 10a are provided on the left and right sides in the width direction, for example, as shown in FIG. 3, and the locking groove 10a is gripped by a later-described saddle-shaped member of the wiper arm connecting portion 5 positioned above. It is formed to be possible.

  Next, in this embodiment, the pair of vertebras 3a and 3b has a shape curved in the thickness direction in an unloaded state, and the wiper blade 1 is formed in the vertebra bra mounting grooves 10b and 10b of the wiper blade rubber 2. By attaching the vertebras 3a and 3b, a state of being curved to a predetermined curvature is obtained.

  Further, the wiper arm connecting portion 5 includes, for example, a U-shaped member 5a having a substantially U-shaped cross section as shown in FIG. 1 and a saddle-shaped member 5b welded to the lower portion thereof and having a cross-sectional shape. The saddle member 5b is fixed to the wiper blade rubber 2 by gripping the locking groove 10a provided below the vertebra mounting groove 10b from both sides.

  Here, the U-shaped member 5a has, for example, a hinge pin 5c for connecting the wiper arm 4 so as to be rotatable and detachable as shown in FIG.

  In the above description, the cross-sectional shape of the base 10 has been described as a substantially rectangular shape as shown in FIG. 3, but of course it is not limited to that shape. For example, the second neck of the base 10 as shown in FIG. It is good also as a shape which has the top fin 21 which the surface on the opposite side to the surface where the part 9 was connected is not a flat surface, but protruded upwards.

  (Operation of wiper blade)

  The operation of the wiper blade 1 configured as described above will be described focusing on the wiper blade rubber 2 when wiping the surface to be wiped.

  FIG. 5 is an explanatory view of a wiper wiping pattern, FIG. 6 is an explanatory view of a state in which the wiper blade is pressed against a surface to be wiped having a different curvature, and FIG. 7 is an explanatory view of a difference in pressing force in the longitudinal direction of the wiper blade rubber. 8 is an explanatory view showing a cross section of the wiper blade when the center line of the wiping portion is 60 ° and 30 ° with respect to the surface to be wiped, and FIG. 9 is an explanatory view showing a cross section of the conventional wiper blade for comparison. FIG. 10 and FIG. 10 are graphs comparing the vertical movement of the base of the wiper blade between this embodiment and the conventional type. In FIG. 7, for convenience of explanation, the curved state of the wiper blade is exaggerated.

  First, the operation of the wiper blade 1 will be described taking wiping of a window glass surface (wiping surface) 15 of an automobile as an example.

  For example, in a normal wiper wiping pattern as shown in FIG. 5, the curved shape of the wiper blade pressed at each position (B, C, D in FIG. 5) in the wiping range changes greatly as shown in FIG. . That is, at the lower end B of the wiping range shown in FIG. 5, the curvature is large as shown in FIG. 6 (a). In particular, the curvature R may be about 1500 mm at the front end side of the wiper blade on the passenger seat side. At the upper end D, the curvature is small as shown in FIG. And in the intermediate part C, as shown in FIG.6 (b), it becomes a substantially intermediate curvature of an upper-lower end.

  In such a design stage of the wiper blade 1, the bending state, the plate thickness, and the plate width of the vertebras 3a and 3b are determined so as to contact the window glass surface 15 with a uniform pressing force over the entire length. However, as described above, the window glass surface 15 has a three-dimensional curvature, and the wiper blade 1 is pressed at each position in the wiping range even in a specific vehicle, as well as different depending on the design of each vehicle type. The curvature of the window glass surface 15 is different. Therefore, it is not easy to always maintain a constant pressing force over the entire length of the wiper blade 1.

  Further, for example, the wiper blade 1 used even at an intermediate curvature position has a curvature larger than the curvature of the window glass surface 15 in a free state where the wiper blade 1 is not pressed against the window glass surface 15. Therefore, when the wiper blade 1 is pressed against the window glass surface 15 by the wiper arm 4 at the center thereof, first, both end portions 16 and 17 of the wiper blade 1 abut against the window glass surface 15. Thereafter, the curvatures of the vertebras 3a and 3b attached to the wiper blade 1 are reduced by elastic deformation, and finally the central portion 18 of the wiper blade 1 comes into contact with the window glass surface 15 so that the wiper blade 1 extends over the entire length of the window glass surface. 15 is pressed by the wiper arm 4.

  From the above, the pressure distribution in the longitudinal direction of the wiper blade 1 is as follows. For example, as shown in FIG. 7, the pressing force on the window glass surface 15 of the wiper blade 1 at both end portions 16 and 17 and the central portion 18 of the wiper blade 1 is It becomes high, and becomes low in those intermediate parts 19 and 20.

  Therefore, as can be seen from FIG. 7, the distance between the base 10 of the wiper blade 1 (the wiper blade rubber 2 fitted with the vertebras 3a and 3b) and the window glass surface 15 is small in the high pressure portion and large in the low pressure portion.

  Therefore, in order to absorb the change in the curvature of the window glass surface 15 to be wiped by the wiper blade 1 and to obtain a stable wiping performance, the base 10 and the window glass surface when the wiper blade 1 is pressed against the window glass surface 15. It is important to have a structure in which the change in the separation distance from 15 (the amount of movement in the vertical direction) can be increased within the range of an appropriate contact angle (tilt angle).

  Next, the structure of the wiper blade 1 as shown in FIG. 8A using the wiper blade rubber 2 specifically described above will be examined. When the wiper blade rubber 2 is pressed against the window glass surface 15 by the pressing force from the wiper arm 4, for example, the first neck portion 7 having a lower bending rigidity in the width direction is elastically deformed and bent, and FIG. As shown to b), the shoulder part 13 of the wiping part 6 contact | abuts to the lower surface 8a which is a surface by the side of the wiping part of the collar part 8, and the bending of the 1st neck part 7 stops. At this time, an angle θ1 formed by the parallel portion 11a of the wiping unit 6 and the window glass surface 15 (also an angle formed by the center line of the wiping unit 6 and the window glass surface 15) is approximately 60 °, and thus excellent wiping performance. Can be obtained.

  Moreover, the height from the window glass surface 15 of the surface 10c by the side of the collar part of the base 10 at this time becomes low by the part which the wiping part 6 inclined. For example, when the height from the window glass surface 15 of the lower surface 8a of the collar portion 8 before the first neck portion 7 is bent is G, the surface 10c moves downward (sinks) by G (1-Sinθ1). Become.

  When the pressing force is further increased, the force received by the wiping portion 6 from the window glass surface 15 is increased, and the wiping portion 6 tends to tilt further, so that the shoulder portion 13 pushes up the lower surface 8a of the collar portion 8 and the collar portion 8 is moved to the window. The second neck portion 9 held parallel to the glass surface 15 is elastically deformed and bent, and the center line I of the flange portion 8 also has a predetermined angle with respect to the window glass surface 15. As a result, the angle formed by the parallel portion 11a of the wiping portion 6 and the window glass surface 15 is smaller than approximately 60 °, and the center line F of the wiping portion 6 is further inclined than in FIG. 8B.

  Eventually, for example, as shown in FIG. 8C, when the corner portion 8 c of the flange portion 8 comes into contact with the flange-side surface 10 c of the base portion 10, the bending of the second neck portion 9 stops. At this time, an angle θ1 formed by the center line I of the flange portion 8 and the window glass surface 15 is approximately 60 °. Thereby, the angle θ2 formed by the parallel portion 11a of the wiping unit 6 and the window glass surface 15 (the angle formed by the center line F of the wiping unit 6 (F in FIG. 8) and the window glass surface 15) is set to the first value. 60 ° due to the bending of the neck portion and 60 ° due to the bending of the second neck portion are combined to be approximately 30 °. Therefore, the contact angle does not become an angle smaller than 30 °, it becomes difficult to remove raindrops on the window glass surface 15, and it is possible to prevent a case where good wiping performance may not be obtained. .

  Moreover, the height from the window glass surface 15 of the surface 10c by the side of the collar part of the base 10 at this time becomes low only by adding up the part which the wiping part 6 inclined, and the part which the collar part 8 inclined. For example, when the height from the window glass surface 15 of the lower surface 8a of the collar portion 8 before the first neck portion 7 is bent is G, the surface 10c moves downward (sinks) by G (1-Sinθ2). Become. Furthermore, when the height of the surface 10c on the heel portion side of the base portion 10 from the lower surface 8a of the heel portion 8 is J, the surface 10c further moves (sinks) downward by J (1-Sinθ1). Therefore, when it is totaled, the downward movement amount in FIG. 8C is G (1−Sinθ2) + J (1−Sinθ1).

  As described above, even if the vertical movement amount of the surface 10c of the base 10 with respect to the window glass surface 15 is increased from G (1-Sinθ1) to G (1-Sinθ2) + J (1-Sinθ1), It is possible to maintain approximately 30 ° to approximately 60 °, which is a contact angle at which good wiping performance is obtained.

  (Configuration of comparative example)

  Next, a wiper blade 101 having a cross-sectional structure as shown in FIG. Here, the wiper blade 101 has the wiper blade rubber 102, the vertebras 3a and 3b, the wiper arm connection portion (not shown), etc., but the vertebra 3a and 3b, the wiper arm connection portion and the base 10 of the wiper blade rubber, etc. Since it is the same structure as this embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  The wiper blade rubber 102 does not have a collar portion as shown in FIG. 9A, and therefore the neck portion only has a neck portion 107 that connects the wiping portion 106 to the base portion 10. On the other hand, the wiping portion 106 has an inverted triangular cross section as shown in FIG. 9 (a) and is formed in the longitudinal direction (the front and back direction in FIG. 9 (a)). The lip portion 111 is in contact with the base end portion 12 on the opposite side of the lip portion 111, and the shoulder portions 13 are provided at both ends in the width direction.

  For example, as shown in FIG. 9A, the lip portion 111 has a substantially rectangular cross section, and includes a parallel portion 111a and an edge 111b. Therefore, when the wiper blade rubber 102 is pressed against the window glass surface 15 by the pressing force from the wiper arm 4, the pressing force is applied in the longitudinal direction of the wiping portion 106, and the parallel portion 111 a of the lip portion 111 becomes the window glass surface 15. The edge 111b of the lip 111 is brought into contact with the window glass surface 15 at an appropriate angle.

  As will be described later, the wiping portion 106 has such a rigidity as to be elastically deformed so that only the lip portion 111 is bent from the center line F of the base end portion 12 when a high pressing force is applied to a part of the wiping portion 106. ing.

  (Operation of comparative example)

  When the wiper blade rubber 102 is pressed against the window glass surface 15 which is the surface to be wiped by the pressing force from the wiper arm 4, for example, the neck portion 107 having a low bending rigidity is elastically deformed and bent, and FIG. 9B shows. As shown, the shoulder portion 13 of the wiping portion 106 comes into contact with the surface 10c of the base portion 10, and the bending of the neck portion 107 stops. At this time, the angle θ′1 formed by the parallel portion 111a of the wiping unit 106 and the window glass surface 15 (the center line of the wiping unit 106 (F in FIG. 9B) and the angle formed by the window glass surface 15) Is approximately 60 °, and good wiping performance can be obtained.

  At this time, the height of the surface 10c of the base 10 from the window glass surface 15 is lowered by the amount of the wiping portion 106 inclined. For example, if the height from the window glass surface 15 of the surface 10c of the base portion 10 before the neck portion 107 is bent is K, the surface 10c moves downward (sinks) by K (1-Sinθ′1).

  Further, when the pressing force is increased, unlike the present embodiment, there is no flange portion, and the parallel portion 111a is long and has low rigidity. For example, as shown in FIG. 9C, the parallel portion 111a is an inverted triangular portion and the parallel portion 111a. The angle θ′2 formed by the parallel part 111a and the window glass surface 15 is approximately 30 °.

  At this time, the height of the surface 10c of the base portion 10c from the window glass surface 15 is lowered by the amount that the lip portion 111 of the wiping portion 106 is further inclined. For example, when the height of the lip 111 from the window glass surface 15 before tilting is L, the angle formed between the parallel portion 111a and the window glass surface 15 (the angle formed between the center line F of the wiping unit 106 and the window glass surface 15). ) Is θ′1, the height of the lip 111 is L (Sin θ′1), so that the surface 10c moves downward (sinks) by L (Sin θ′1) −L (Sin θ′2). It becomes. At this time, K (1-Sinθ′1), which is the downward movement amount (sinking amount) of the surface 10c before and after the inclination of the wiping unit 106, is maintained as it is, so that the surface in FIG. The downward movement amount (sink amount) of 10c is K (1−Sinθ′1) + L (Sinθ′1) −L (Sinθ′2).

  (Comparison study of this embodiment and comparative example)

  Based on the above results, the wiper blade 1 of this embodiment and the wiper blade 101 of the comparative example have an angle (contact angle) formed by the parallel part (center line of the wiping part) and the window glass surface 15 from 90 ° to 30 °. The horizontal axis represents the amount of vertical movement of the lower surface of the base relative to the window glass surface 15, and the vertical axis represents the length of the neck portion and the wiping portion before the inclination, and this embodiment is a black circle. Is represented by a white circle in the graph of FIG. In order to simplify the calculation, the length L of the parallel portion 111a of the comparative example is set to 0.4 times the total length K of the neck portion and the wiping portion, and the second neck portion before the wiping portion is inclined. 9 and the vertical length J of the collar portion 8 are 0.4 times the vertical length G of the first neck portion 7 and the wiping portion 6.

  For example, when the contact angle is 90 °, Sin90 ° is 1, and G (1-Sinθ1) and K (1-Sinθ′1) are zero. When the contact angle is 60 °, G (1-Sinθ1) and K (1-Sinθ′1) are G = K = 1, and the vertical movement amount is 1−0.8660 = 0.134. From the contact angle θ = 90 ° to 60 °, the wiper blade 1 of this embodiment and the wiper blade 101 of the comparative example have the same vertical movement amount as shown in FIG.

  On the other hand, at a preferable contact angle of 57 °, for example, in this embodiment, G (1−Sinθ2) + J (1−Sinθ1) = 1−Sin57 ° + 0.4 (1−Sin87 °) = 0.61313 + 0.00056 = 0.16186.

  On the other hand, in the comparative example, K (1−Sinθ′1) + L (Sinθ′1) −L (Sinθ′2) = 0.134 + 0.4 × 0.8660−0.4 × Sin57 ° = 0.134 + 0.01092 = 0.14492.

  In the present embodiment, for example, 54 °, which is a preferable contact angle, G (1−Sinθ2) + J (1−Sinθ1) = 1−Sin54 ° + 0.4 (1−Sin84 °) = 0.191 + 0.0022 = 0. 1932.

  On the other hand, in the comparative example, K (1−Sinθ′1) + L (Sinθ′1) −L (Sinθ′2) = 0.134 + 0.4 × 0.8660−0.4 × Sin54 ° = 0.134 + 0.0228 = 0.1568.

  Hereinafter, the graph of FIG. 10 is obtained by calculating in the same manner up to a contact angle of 30 ° and putting the value in the graph in this embodiment and the comparative example.

  As is clear from FIG. 10, since the deformed portion at the time of high pressure with a high pressing force on the window glass surface 15 is the second neck portion 9 from the conventional lip portion 111, the contact angles θ2 and θ′2 at the time of high pressure are obtained. Although the same, the distance in the vertical direction between the surface 10c of the base 10 and the window glass surface 15 at the time of low pressure and high pressure is significantly larger than that of the comparative example which is a conventional product.

  Therefore, when the wiper blade 1 is pressed against the window glass surface 15, even if the pressure distribution in the longitudinal direction becomes non-uniform and a low pressure portion and a high pressure portion are generated, the new structure and elastic deformation of the wiper blade rubber 2 are caused. Desirable wiping performance can be obtained in a wider pressing force range due to the bending of the first neck portion and the second neck portion.

  FIG. 11 is an explanatory diagram showing a difference in pressing force in the longitudinal direction of the wiper blade rubber of FIG. 7 and a schematic cross section of the wiper blade.

  As described above, the pressure distribution in the longitudinal direction of the wiper blade 1 is high at both end portions 16 and 17 and the central portion 18 and low at intermediate portions 19 and 20 as shown in FIG. In the present embodiment, for example, as shown in FIG. 11, the wiping portion 6 has its inclination state changed so that the separation distance from the window glass surface 15 is small at the high pressure portion and large at the low pressure portion.

  Thus, according to the present embodiment, the first neck portion 7 and the second neck portion 9 are provided between the base portion 10 and the wiping portion 6, and the first neck portion 7 and the second neck portion are further provided. Since the collar portion 8 connected between the portions 9 is arranged, when the first neck portion 7 is elastically deformed and bent a predetermined amount, the second neck portion 9 is elastically deformed via the collar portion 8. Therefore, the amount of vertical movement of the base 10 can be increased within a predetermined contact angle range in which wiping performance is good. For this reason, even if the window glass has a different curvature depending on the wiping position or the window glass has a different curvature for each vehicle type, the change in curvature can be absorbed, and good wiping performance can be maintained.

  Further, the shoulder portion 13 of the wiping portion 6 can be brought into contact with the collar portion 8, the collar portion 8 can be brought into contact with the base portion 10, and the bending rigidity of the second neck portion 9 is further increased by the first neck portion 7. Higher than the bending rigidity. Accordingly, the first neck portion 7 is bent before the second neck portion 9, and the shoulder portion 13 of the inclined wiping portion 6 abuts on the collar portion 8, thereby bending the second neck portion 9. It is possible, and since the collar portion 8 bends the second neck portion 9 with certainty, more accurate wiping performance can be ensured.

  Further, when the contact angle is about 60 ° with respect to the window glass surface 15, for example, the shoulder portion 13 of the wiping portion 6 comes into contact with the flange portion 8, so that the first neck portion itself is not bent any more and is stable. When a higher pressing force is applied, the second neck portion 9 is bent by the force from the shoulder portion 13 of the wiping portion 6, and the heel portion 8 is inclined to be wiped off. The part 6 can also be inclined more greatly. Thereby, the vertical movement amount of the base 10 can be increased within a predetermined contact angle range in which wiping performance is good. For this reason, even a window glass having a different curvature depending on the wiping position or a window glass having a different curvature for each vehicle type can absorb the change in curvature and maintain good wiping performance.

  Further, in order not to cause wiping residue on the surface to be wiped, the angle (contact angle) between the center line F of the wiping portion 6 of the wiper blade rubber 2 and the surface to be wiped is preferably about 30 ° to about 60 °. However, when the wiper blade rubber 2 according to the present invention is pressed against the surface to be wiped, for example, as shown in FIG. The contact angle of about 60 ° is obtained stably by bending due to elastic deformation, and the thickness in the width direction is set to be thicker than that of the first neck portion 7 in addition to the bending of the first neck portion 7 in the high pressure portion. The second neck 9 is bent by elastic deformation and a contact angle of up to about 30 ° is obtained.

  At this time, the bending of the second neck portion 9 generates a large amount of movement in the vertical direction at the base portion 10 of the wiper blade rubber 2, so even if the pressure distribution is not uniform over the longitudinal direction of the wiper blade 1. Since the lip portion 11 of the wiping portion 6 can contact the surface to be wiped within a contact angle range that does not cause unwiping, it absorbs changes in the curvature of the window glass and provides stable and excellent wiping performance. It is done.

  In the above embodiment, the preferable contact angle range is about 30 ° to about 60 °, but the contact angle is not limited to this angle range. In the case of a slight degree, the degree of adhesion of oils and fats, etc., it may be about 20 ° to about 70 °.

  (Second Embodiment)

  Next, a second embodiment of the wiper blade according to the present invention will be described. In the present embodiment, the wiper blade rubber is different from the first embodiment in that the wiper blade rubber is used for a wiper blade having a connection fitting having a tournament structure (hereinafter referred to as a tournament fitting). In the following description, components that are the same as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and description thereof is omitted or simplified. .

  FIG. 12 is a schematic front view of the wiper blade according to the second embodiment.

  (Configuration of wiper blade)

  For example, as shown in FIG. 12, the wiper blade 201 includes a wiper blade rubber 2, a pair of vertebras 3a and 3b that impart predetermined elasticity and rigidity (torsional rigidity and lateral rigidity) to the wiper blade rubber 2, and the wiper blade 201 in an arc shape. And a tournament fitting 230 for connecting to the wiper arm 4 for transmitting a driving force for reciprocal movement.

  Here, the tournament fitting 230 includes a primary lever 231, secondary levers 232, 233, and the like, for example, as shown in FIG. 12.

  For example, as shown in FIG. 12, the primary lever 231 has a hinge pin 231b that connects the wiper arm 4 to the center 231a in the longitudinal direction so as to be rotatable and detachable.

  For example, as shown in FIG. 12, the secondary lever 232 has a hinge pin 232b in a substantially central portion 232a in the longitudinal direction, and one end portion 231c in the longitudinal direction of the primary lever 231 is rotatably connected to the hinge pin 232b.

  Further, for example, as shown in FIG. 12, the secondary lever 232 has gripping portions 232 c and 232 d for gripping the wiper blade rubber 2 at both ends, and the gripping portions 232 c and 232 d in the locking grooves 10 a and 10 a of the wiper blade rubber 2, for example. Is engaged to hold the wiper blade rubber 2.

  Further, for example, as shown in FIG. 12, the secondary lever 233 has a hinge pin 233b at a substantially central portion 233a in the longitudinal direction, and the other longitudinal end 231d of the primary lever 231 is rotatably connected to the hinge pin 233b. .

  Further, for example, as shown in FIG. 12, the secondary lever 233 has grip portions 233 c and 233 d for gripping the wiper blade rubber 2 at both ends. For example, the grip portions 233 c and 233 d in the locking grooves 10 a and 10 a of the wiper blade rubber 2. Is engaged to hold the wiper blade rubber 2.

  (Operation of wiper blade)

  Since the operation of the wiper blade 201 is substantially the same as that of the first embodiment, the description thereof is omitted. However, as is clear from the comparison between FIG. 7 and FIG. 12, the amount of the high pressure portion and the low pressure portion applied to the wiper blade rubber 2 of the same length is increased by providing the tournament fitting 230 from the first embodiment. The change in the curvature of the wiping surface can be absorbed, and better wiping performance can be maintained.

  As described above, according to the present embodiment, the wiper blade rubber capable of responding to the specific curvature of the surface to be wiped by providing the base 10 with the vertebras 3a and 3b and capable of following a wide range of changes in the curvature. 2 is provided, the number of places to be gripped by the tournament fitting 230 can be reduced (e.g., 8-point support can be changed to 4-point support), the structure can be simplified, the cost can be reduced, and the appearance can be cleaned. It becomes possible.

  (Third embodiment)

  Next, a third embodiment of the wiper blade according to the present invention will be described. In the present embodiment, the first neck portion and the second neck portion of the wiper blade rubber are different from those in the first embodiment.

  13 is a schematic perspective view of a wiper blade according to a third embodiment of the present invention, FIG. 14 is a schematic perspective view of a wiper blade rubber, FIG. 15 is a cross-sectional view taken along line AA in FIG. 14, and FIG. It is explanatory drawing which shows the cross section of a wiper blade when a centerline becomes 60 degrees and 30 degrees with respect to the to-be-wiped surface. In the description of the wiper blade rubber 402, as shown in FIG. 14, the X-axis direction is the “longitudinal direction” of the wiper blade rubber 402, the Y-axis direction is the “width direction” of the wiper blade rubber 402, and the Z-axis direction is It is defined as “up and down direction” of the wiper blade rubber 402.

  (Configuration of wiper blade)

  For example, as shown in FIG. 13, the wiper blade 401 includes a wiper blade rubber 402, a pair of vertebras 3a and 3b that impart predetermined elasticity and rigidity (torsional rigidity and lateral rigidity) to the wiper blade rubber 402, and the wiper blade 401 in an arc shape. And a wiper arm connecting portion 5 as a connecting portion for connecting a wiper arm 4 for transmitting a driving force for reciprocating movement.

  The wiper blade rubber 402 is made of an elastic body such as rubber, and is formed in a long shape as shown in FIGS. 14 and 15, for example. The first neck portion 407 connected to the wiping portion 6, the flange portion 8 connected to the first neck portion 407, the second neck portion 409 connected to the flange portion 8, and the second neck And a base portion 10 connected to the portion. That is, the first neck part 407 is located between the wiping part 6 and the collar part 8 and both are connected, and the second neck part 409 is located between the collar part 8 and the base part 10 and both are connected. It has a structure to do.

  Here, for example, as shown in FIG. 15, the second neck portion 409 has a substantially quadrangular cross section and is formed in the longitudinal direction (X-axis direction in FIG. 15). One end side which is one side of the quadrilateral is integrally connected, and the other end side opposite to the one end side is integrally connected to the surface of the base portion 10 on the flange side. The second neck portion 409 is configured such that the bending rigidity in the width direction (bending resistance in the width direction) is smaller than the bending rigidity in the width direction (bending resistance in the width direction) of the first neck portion 407 described later. The width of the second neck portion 409 (in the Y-axis direction in FIG. 15) is, for example, about 0.5 mm.

  Further, the second neck portion 409 has a center line (F in FIG. 16B) of the lip portion 11 of the wiping portion 6 when the corner portion 8c of the flange portion 8 comes into contact with the surface of the base portion 10 on the flange portion side. ) And the surface to be wiped (θ11 in FIG. 16B) is, for example, approximately 60 °, the length of the second neck portion 409 in the vertical direction (Z-axis direction in FIG. 15). Is, for example, about 1 mm.

  For example, as shown in FIG. 15, the collar portion 8 has a substantially rectangular cross section and is formed in the longitudinal direction (X-axis direction in FIG. 15), and in addition to a first neck portion 407, which will be described later, substantially at the center of the lower surface 8a. The end side is integrally connected, and the second neck portion 409 is integrally connected to the approximate center of the upper surface 8b which is the surface opposite to the wiping portion 6 side of the collar portion 8. In addition, the width direction of the flange portion 8 is such that the second neck portion 409 is bent in the width direction by elastic deformation by the pressing force from the base portion 10 as described later, and the corner portion 8c of the upper surface 8b of the flange portion 8 is It is formed smaller than the size of the base 10 in the width direction so as to be able to contact the surface of the base 10 on the flange side.

  Further, the first neck portion 407 is formed in the longitudinal direction (X-axis direction in FIG. 15), for example, as shown in FIG. One end side which is one side is integrally connected, and the other end side opposite to the one end side is integrally connected to a lower surface 8a of the wiping portion 6 side of the flange portion 8. Also, the bending stiffness (bending resistance in the width direction) of the first neck portion 407 is configured to be greater than the bending stiffness (bending resistance in the width direction) of the second neck portion 409. The width of the first neck portion 407 (in the Y-axis direction in FIG. 15) is, for example, about 1.0 mm.

  Further, the first neck portion 407 is formed when the corner portion 8c of the flange portion 8 is in contact with the surface on the flange portion side of the base portion 10 and the shoulder portion 13 of the wiping portion 6 is in contact with the lower surface 8a of the flange portion 8. In addition, the angle (θ21 in FIG. 16C) formed by the center line of the lip portion 11 of the wiping unit 6 (F in FIG. 16C) and the surface to be wiped is, for example, approximately 30 °. The length of the first neck portion 407 in the vertical direction (Z-axis direction in FIG. 15) is, for example, about 0.8 mm.

  As a result, when the wiper blade rubber 402 is pressed against the surface to be wiped by the pressing force from the wiper arm 4 and the wiping portion 6 is pressed, as described later, the second one having the lower bending rigidity in the width direction first. The neck portion 409 is elastically deformed and bent in the width direction, and then the first neck portion 407 having the higher bending rigidity in the width direction is elastically deformed and bent in the width direction.

  In the above description, as the wiper blade rubber 402, the cross-sectional shape of the base 10 is illustrated as a substantially rectangular shape as shown in FIG. 15, but of course the shape is not limited to this, and the second neck of the base 10 is not limited. The surface opposite to the surface to which the portion 409 is connected is not a flat surface, but may have a shape having the top fin 21 protruding upward, for example, as shown in FIG.

  (Operation of wiper blade)

  The operation of the wiper blade 401 configured as described above will be described focusing on the wiper blade rubber 402 when wiping the surface to be wiped.

  FIG. 17 is a graph showing the amount of vertical movement of the base of the wiper blade in the present embodiment (third embodiment) compared with the first embodiment and the conventional type.

  Specifically, the structure of the wiper blade 401 as shown in FIG. 16A using the wiper blade rubber 402 as described above will be considered.

  When the wiper blade rubber 402 is pressed against the window glass surface 15 by the pressing force from the wiper arm 4, the second neck portion 409 having a lower bending rigidity in the width direction is elastically deformed and bent, and FIG. ), The bending of the second neck portion 409 stops when the corner portion 8c of the flange portion 8 abuts against the flange-side surface 10c of the base portion 10. At this time, the angle θ11 formed by the parallel portion 11a of the wiping portion 6 and the window glass surface 15 (also the angle formed by the center line I of the flange portion 8 and the window glass surface 15) is approximately 60 °, which is excellent wiping. Performance can be obtained.

  At this time, the height of the surface 10c on the heel side of the base portion 10 from the window glass surface 15 is reduced by the amount of inclination of the heel portion 8 and the wiping portion 6 and the like. When the height from the window glass surface 15 of the lower surface 8a of the collar portion 8 before the second neck portion 409 is bent is G (G in FIG. 16A), the surface 10c is G (1-Sinθ11). It will move down (sink). Furthermore, if the height from the lower surface 8a of the flange 8 of the surface 10c of the base 10 before the second neck portion 409 is bent is J (J in FIG. 16A), the surface is J (1-Sinθ11). 10c moves downward (sinks).

  Accordingly, the entire amount of movement is J (1-Sinθ11) + G (1-Sinθ11), and the surface 10c on the heel side of the base portion 10 moves downward (sinks).

  When the pressing force is further increased, the force received by the wiping portion 6 from the window glass surface 15 is increased. However, since the corner portion 8c of the flange portion 8 is in contact with the surface 10c on the flange portion side of the base portion 10, Tilt is regulated. For this reason, when the wiping portion 6 is inclined with respect to the flange portion 8, the first neck portion 407 having the higher bending rigidity in the width direction is elastically deformed and bent, and the center line F of the wiping portion 6 is the window glass surface. 15 has a predetermined angle. As a result, the angle formed by the parallel portion 11a of the wiping portion 6 and the window glass surface 15 is smaller than about 60 °, and the center line F of the wiping portion 6 is further inclined than FIG. 16 (b).

  Eventually, as shown in FIG. 16C, for example, the shoulder portion 13 of the wiping portion 6 comes into contact with the lower surface 8a that is the surface of the heel portion 8 on the wiping portion side and tries to push up the lower surface 8a. Since the corner portion 8c is in contact with the flange-side surface 10c of the base portion 10, the first neck portion 407 is not bent any further and the inclination of the wiping portion 6 is restricted.

  At this time, the angle θ11 formed by the center line I of the flange portion 8 and the window glass surface 15 is approximately 60 °. Thereby, the angle θ21 formed by the parallel part 11a of the wiping unit 6 and the window glass surface 15 (the angle formed by the center line F of the wiping unit 6 (F in FIG. 16C) and the window glass surface 15) is 60 ° due to the bending of the first neck portion 407 and 60 ° due to the bending of the second neck portion 409 are combined to become approximately 30 °. Therefore, the contact angle does not become an angle smaller than 30 °, it becomes difficult to remove raindrops on the window glass surface 15, and it is possible to prevent a case where good wiping performance may not be obtained. .

  As described above, the vertical movement amount of the surface 10c of the base 10 with respect to the window glass surface 15 is changed from G (1-Sinθ11) + J (1-Sinθ11) to G (1-Sinθ21) + J (1-Sinθ11). Even when the contact angle is increased, the contact angle at which good wiping performance is obtained can be maintained from approximately 30 ° to approximately 60 °.

  (Comparison study of this embodiment and comparative example)

  Based on the above results, the wiper blade 401 of this embodiment and the wiper blade 101 of the comparative example have an angle (contact angle) formed by the parallel part (center line of the wiping part) and the window glass surface 15 from 90 ° to 30 °. The horizontal axis. Further, the vertical movement amount of the lower surface of the base portion with respect to the window glass surface 15 is defined as the vertical axis with the overall height of the wiping portion and the heel portion of the comparative example (K in FIG. 9A) as 1. The graph of FIG. 17 shows the first embodiment as a black circle, the third embodiment as a black triangle, and the comparative example as a white circle.

  In order to simplify the calculation, the length L of the parallel portion 111a of the comparative example is set to 0.4 times the total length K of the neck portion and the wiping portion, and further, the inclination of the flange portion 8 of the third embodiment The length J in the vertical direction of the front second neck portion 409 and the collar portion 8 is assumed to be 0.4 times the length G in the vertical direction between the first neck portion 407 and the wiping portion 6 (first This is the same as the embodiment of FIG. Further, the values in the first embodiment are used as they are for the black circles and white circles in the graph of FIG.

  Here, the vertical movement amount of the lower surface of the base portion is, for example, a contact angle of 90 ° to 60 ° and G (1−Sinθ1) + J (1−Sinθ1) in the first embodiment, this embodiment (third implementation). In the embodiment, G (1-Sinθ11) + J (1-Sinθ11) and in the comparative example are represented by K (1-Sinθ'1). For example, when the contact angle is 90 °, Sin90 ° is 1, and the above equations are zero. That is, when the contact angle is 90 ° (the origin in FIG. 17), the comparative example, the first embodiment, and the present embodiment (third embodiment) have the same value (the vertical movement amount is zero).

  When the contact angle is 60 °, G (1−Sinθ11) + J (1−Sinθ11) in the present embodiment, and in the first embodiment, the second neck portion 9 does not bend, so G (1−Sinθ1). ), K (1-Sinθ′1) in the comparative example. Here, when G = K = 1, the vertical movement amount is 1-0.8660 = 0.134 in the first embodiment and the comparative example, but in the third embodiment, (1-0.8660) +0. 4 (1-0.8660) = 0.134 + 0.0536 = 0.187.

  On the other hand, when the contact angle is less than 60 ° and 30 ° or more, the vertical movement amount of the lower surface of the base is G (1-Sinθ21) + J (1-Sinθ11) in the present embodiment (third embodiment). In the first embodiment, G (1−Sinθ2) + J (1−Sinθ1), and in the comparative example, K (1−Sinθ′1) + L (Sinθ′1) −L (Sinθ′2).

  Here, in the present embodiment, θ11 does not change at 60 °, so θ11 = 60 °, and only θ21 changes. Therefore, as an example of a preferable contact angle, for example, if the contact angle (θ21) is 57 °, G (1−Sinθ21) + J (1−Sinθ11) = 1−Sin57 ° + 0.4 (1−Sin60 °) = 0.1613 + 0.4 × 0.134 = 0.2149.

  Further, at a preferred contact angle of 54 °, for example, in this embodiment (third embodiment), G (1−Sinθ21) + J (1−Sinθ11) = 1−Sin54 ° + 0.4 (1−Sin60 °) = 0.191 + 0.4 × 0.134 = 0.2446.

  FIG. 17 is a graph in which the contact angle is calculated in the same manner up to 30 ° and the values are plotted in this embodiment (third embodiment) and the comparative example. Note that the values of the first embodiment and the comparative example and how to derive them are described in the first embodiment, and are omitted here.

  As apparent from FIG. 17 and FIG. 18 to be described later, the deformed portion at the time of high pressure at which the pressing force to the window glass surface 15 is high becomes the first neck portion 409 from the conventional lip portion 111. Although θ21 and θ′2 are the same, the distance in the vertical direction between the surface 10c of the base 10 and the window glass surface 15 at the time of low pressure and high pressure is significantly larger than that of the comparative example which is a conventional product.

  Therefore, when the wiper blade 401 is pressed against the window glass surface 15, even if the pressure distribution in the longitudinal direction becomes non-uniform and a low pressure portion and a high pressure portion are generated, the wiper blade rubber 402 has a new structure and elastic deformation due to elastic deformation. Due to the bending of the first neck portion 407 and the second neck portion 409, desired wiping performance can be obtained in a wider range of pressing force.

  Further, according to the present embodiment (third embodiment), the first neck portion 407 and the wiping portion 6 are integrally inclined by the bending of the second neck portion 409 first. In addition, since the first neck portion 407 is bent with respect to the collar portion 8 after the inclination of the collar portion 8 is regulated at a predetermined angle, the amount of lowering is substantially the same as in the first embodiment. By being able to.

  FIG. 18 is an explanatory view showing a difference in pressing force in the longitudinal direction of the wiper blade rubber of the third embodiment and a schematic cross section of the wiper blade.

  As described above, the pressure distribution in the longitudinal direction of the wiper blade 401 is high at the end portions 16 and 17 and the central portion 18 and is low at the intermediate portions 19 and 20, so that the base 10 and the window glass surface 15 In the present embodiment, for example, as shown in FIG. 18, the wiping portion 6 has its inclination changed so that the separation distance is small at the high pressure portion and large at the low pressure portion.

  As described above, according to this embodiment, the first neck portion 407 and the second neck portion 409 are provided between the base portion 10 and the wiping portion 6, and the first neck portion 407 and the second neck portion are further provided. Since the collar portion 8 connected between the portions 409 is arranged, the second neck portion 409 is elastically deformed and bent by a predetermined amount, and the collar portion 8 and the wiping portion 6 are integrally inclined, The flange 8 abuts on the lower surface 10 c of the base 10.

  Thereby, since the inclination of the collar part 8 is regulated, the first neck part 407 is then elastically deformed and bent, and the wiping part 6 is further inclined.

  For this reason, within the range of a predetermined contact angle with good wiping performance, the vertical movement amount of the base 10 can be increased, and even with a window glass having a different curvature depending on the wiping position or a window glass having a different curvature for each vehicle type The change in curvature can be absorbed, and good wiping performance can be maintained.

  Further, since the collar portion 8 can abut against the base portion 10, the collar portion 8 abuts against the lower surface 10c of the base portion 10 and the bending of the second neck portion 409 is restricted. Therefore, when the base portion 10 is further pushed down, 1 neck part 407 comes to bend reliably.

  And if the 1st neck part 407 bends a predetermined amount, since the shoulder part 13 of the wiping part 6 will contact | abut to the collar part 8, the inclination with respect to the window glass surface 15 of the wiping part 6 will stop at a predetermined angle. Thereby, more accurate wiping performance can be secured.

  Furthermore, when the contact angle is about 60 ° with respect to the window glass surface 15, the collar portion 8 comes into contact with the base portion 10, so that the second neck portion 409 itself does not bend any more and is stably wiped off. When a higher pressing force is applied, the first neck portion 407 is bent and the wiping portion 6 is inclined more greatly, but the shoulder portion 13 of the wiping portion 6 is In order to contact the lower surface 8a, the inclination of the wiping portion 6 stops at a predetermined angle. Thereby, the vertical movement amount of the base 10 can be increased within a predetermined contact angle range in which wiping performance is good. For this reason, even a window glass having a different curvature depending on the wiping position or a window glass having a different curvature for each vehicle type can absorb the change in curvature and maintain good wiping performance.

  Further, in order not to cause wiping residue on the surface to be wiped, the angle (contact angle) between the center line F of the wiping portion 6 of the wiper blade rubber 402 and the surface to be wiped is preferably about 30 ° to about 60 °. However, when the wiper blade rubber 402 according to the present invention is pressed against the surface to be wiped, for example, as shown in FIG. 18, in the low pressure portion, the second neck portion 409 whose thickness in the width direction is set thin is formed. The contact angle of about 60 ° is stably obtained by bending due to elastic deformation, and the thickness in the width direction is set to be thicker than that of the second neck portion 409 in addition to the bending of the second neck portion 409 in the high pressure portion. The first neck portion 407 is bent by elastic deformation to obtain a contact angle of up to about 30 °.

  At this time, the bending of the second neck portion 409 generates a large amount of movement in the vertical direction at the base portion 10 of the wiper blade rubber 402. Therefore, even when the pressure distribution is not uniform over the longitudinal direction of the wiper blade 401. The lip part 11 of the wiping part 6 can abut against the surface to be wiped within a contact angle range that does not cause wiping residue, so that the change in the curvature of the window glass is absorbed and excellent wiping performance is obtained. It is done.

  In addition, the bend of the second neck portion 409 first causes the flange portion 8, the first neck portion 407, and the wiping portion 6 to be integrally inclined, and further, the inclination of the flange portion 8 is regulated at a predetermined angle. After being done, the first neck portion 407 is inclined with respect to the collar portion 8, so that it is possible to obtain a descent amount substantially equal to that in the first embodiment.

  Note that the wiper blade rubber 402 according to the present embodiment can be used in the same manner even in a type using the tournament fitting 230 as shown in FIG. The number can be reduced (for example, 8-point support can be changed to 4-point support), and the structure can be simplified to reduce the cost and to improve the appearance.

  In addition, as the first to third embodiments described above, the preferable contact angle range is about 30 ° to about 60 °, but the contact angle is not limited to this angle range, When the condition of the surface to be wiped (degree of dirt, degree of adhesion of oils and fats) is slight, it may be about 20 ° to about 70 °.

  The present invention is not limited to any of the above-described embodiments, and can be implemented with appropriate modifications within the scope of the technical idea of the present invention.

Furthermore, in the wiper blade of the present invention, the connecting metal fitting is not limited to those exemplified in the first to third embodiments, and can have any shape or structure.

1 is a schematic perspective view of a wiper blade according to a first embodiment of the present invention. 1 is a schematic perspective view of a wiper blade rubber according to a first embodiment of the present invention. It is the sectional view on the AA line of FIG. It is sectional drawing of the wiper blade rubber which has a top fin on the upper part of a base. It is explanatory drawing of the wiping pattern of a wiper. It is explanatory drawing of the state by which a wiper blade is pressed by the to-be-wiped surface from which curvature differs. It is explanatory drawing of the difference in the pressing force in the longitudinal direction of the wiper blade rubber which concerns on the 1st Embodiment of this invention. It is explanatory drawing which shows the cross section of a wiper blade when the centerline of the wiping part which concerns on the 1st Embodiment of this invention becomes 60 degrees and 30 degrees with respect to the to-be-wiped surface. It is explanatory drawing which shows the cross section of the conventional type wiper blade for a comparison. It is the graph which compared this embodiment and the conventional type about the amount of up-and-down movement of the base of the wiper blade concerning a 1st embodiment of the present invention. It is explanatory drawing which shows the difference of the pressing force in the longitudinal direction of the wiper blade rubber of FIG. 7, and the schematic cross section of a wiper blade. It is a schematic front view of the wiper blade which concerns on the 2nd Embodiment of this invention. It is a schematic perspective view of the wiper blade which concerns on the 3rd Embodiment of this invention. It is a schematic perspective view of the wiper blade rubber which concerns on the 3rd Embodiment of this invention. It is AA sectional view taken on the line of FIG. It is explanatory drawing which shows the cross section of a wiper blade when the centerline of the wiping part which concerns on the 3rd Embodiment of this invention becomes 60 degrees and 30 degrees with respect to the to-be-wiped surface. It is the graph which compared the amount of vertical movements of the base of the wiper blade concerning a 3rd embodiment of the present invention with a 1st embodiment and a conventional type. It is explanatory drawing which shows the schematic cross section of the difference in the pressing force in the longitudinal direction of the wiper blade rubber of the 3rd Embodiment of this invention, and a wiper blade. It is a schematic front view of the wiper blade of the conventional tournament structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,101,201,301,401 ... Wiper blade 2,102,302,402 ... Wiper blade rubber 3a, 3b ... Vertibra 4 ... Wiper arm 5 ... Wiper arm connection part 6,106 ... Wiping part 7, 107, 407 ... 1st neck part 8 ... collar part 9, 409 ... 2nd neck part 10 ... base part 11, 111 ... lip part 13 ... shoulder part 14 ... surface to be wiped 230 ... tournament fitting 350 ... connection fitting 351 ... gripping part

Claims (17)

A wiper blade rubber for wiping the surface to be wiped,
A wiping portion having a lip portion for wiping the surface to be wiped on one end side and a shoulder portion on the other end side;
A buttock with which the shoulder can contact;
A base part with which the collar part can come into contact;
A first neck portion connecting the wiping portion and the collar portion;
A wiper blade rubber comprising: a second neck portion that connects the flange portion and the base portion and has a bending stiffness different from that of the first neck portion. The wiper blade rubber according to claim 1,
The wiper blade rubber according to claim 1, wherein the second neck portion has a bending rigidity higher than that of the first neck portion. The wiper blade rubber according to claim 1,
The wiper blade rubber according to claim 2, wherein the second neck portion has a bending rigidity lower than that of the first neck portion. The wiper blade rubber according to any one of claims 1 to 3,
The wiper blade rubber according to claim 1, wherein the lip portion does not substantially deform in the width direction of the wiping portion during a reciprocating wiping operation. A wiper blade rubber for wiping the surface to be wiped,
A wiping portion having a lip portion for wiping the surface to be wiped on one end side and a shoulder portion on the other end side;
A buttock with which the shoulder can contact;
A base part with which the collar part can come into contact;
A first neck portion connecting the wiping portion and the collar portion;
A wiper blade rubber comprising: two neck portions that connect the collar portion and the base portion and have a thickness in the width direction different from the thickness in the width direction of the first neck portion. The wiper blade rubber according to claim 5,
The wiper blade rubber characterized in that the second neck portion has a thickness in the width direction that is thicker than a thickness in the width direction of the first neck portion.
The wiper blade rubber according to claim 5 or 6,
The wiper blade rubber characterized in that the thickness in the width direction of the second neck portion is 1.6 times or more and 4 times or less than the thickness in the width direction of the first neck portion. The wiper blade rubber according to claim 5,
The wiper blade rubber according to claim 1, wherein the second neck portion has a thickness in the width direction that is thinner than a thickness in the width direction of the first neck portion. The wiper blade rubber according to claim 5 or 8,
The wiper blade rubber characterized in that the thickness in the width direction of the first neck portion is 1.6 times or more and 4 times or less than the thickness in the width direction of the second neck portion. The wiper blade rubber according to any one of claims 5 to 9,
The wiper blade rubber according to claim 1, wherein the lip portion does not substantially deform in the width direction of the wiping portion during a reciprocating wiping operation. The wiper blade rubber according to any one of claims 1 to 10,
The wiper blade rubber characterized in that the lip portion has a parallel portion having a substantially constant thickness in the width direction, and the length of the parallel portion is 1 mm or less or the thickness thereof is 0.8 mm or more. The wiper blade rubber according to any one of claims 1 to 11,
A wiper blade rubber characterized in that a length in a center line direction connecting the first neck portion and the wiping portion is longer than a length in a center line direction connecting the second neck portion and the flange portion. The wiper blade rubber according to any one of claims 1 to 12,
The wiper blade rubber according to claim 1, wherein an angle formed between the wiped surface and the center line of the lip portion is formed by bending due to elastic deformation of the first neck portion and the second neck portion. The wiper blade rubber according to claim 13,
The wiper blade rubber is characterized in that the angle is not less than about 30 ° and not more than about 60 °. The wiper blade rubber according to any one of claims 1 to 14,
A wiper blade comprising: a vertebra provided in the base portion. A wiper blade for wiping the surface to be wiped with a wiper arm,
The wiper blade rubber according to any one of claims 1 to 14,
A vertebra provided in the base;
A wiper blade comprising: a connection portion that is provided at a substantially central portion in a length direction of the base portion and connects the wiper arm. The wiper blade rubber according to any one of claims 1 to 14,
A vertebra provided in the base;
A wiper blade comprising: a tournament fitting for gripping the base portion at a plurality of positions in the length direction.

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