JP2019098858A - Wiper arm energization member and wiper device for vehicle - Google Patents

Abstract

To provide a wiper arm energization member which can reduce a rotation region around a drive shaft.SOLUTION: A wiper arm energization member F comprises: a drive shaft 11 which is reciprocated around a first axis X1 by a drive unit K; a tilting component 13 which is so supported at a tip of the drive shaft 11 as to be tiltable around an axis X2 having such a positional relationship as to cross the first axis X1, and is connected to a wiper arm WA; a lower support member 15 which is so supported at an intermediate part of the drive shaft 11 as to be rotatable around a third axis X3 along the second axis X2; an upper support member 16 which is so supported to the tilting component 13 as to be rotatable around a fourth axis X4 parallel to the third axis X3; and a compression coil spring 19 is so located that the drive shaft 11 is inserted therein, is supported by the lower support member 15, and applies energization force to the upper support member 16.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a wiper arm biasing member and a vehicle wiper device provided with the wiper arm biasing member.

  Conventionally, as a wiper device for a vehicle, a wiper arm is fixed to a drive shaft that is reciprocated by a drive device, and a coil spring for urging the wiper blade to the wiping surface side is inside a member that constitutes the wiper arm. There is an arrangement (see, for example, Patent Document 1). Further, as another vehicle wiper device, there is provided a swing member which is integrally rotated with a drive shaft which is reciprocated by a drive device, and a tilt member which is connected to the swing member so as to be tiltable and to which a wiper arm is fixed. There is a type provided with a coil spring which is supported by a swing member at one end and applies an urging force to a tilt member (see, for example, Patent Document 2). In this vehicle wiper device, since the coil spring is not disposed inside the wiper arm, the wiper arm can be miniaturized (thinned).

JP, 2009-241737, A JP, 2016-101796, A

  However, in the vehicle wiper device (wiper arm biasing member) in which the coil spring is disposed between the swinging member and the tilting member as described above, the coil spring is disposed to be aligned with the drive shaft. At the same time, the coil spring swings around the drive shaft, and there is a problem that a rotation area (a space required for mounting) around the drive shaft is increased.

  The present invention has been made to solve the above-mentioned problems, and an object thereof is to provide a wiper arm biasing member and a wiper device for a vehicle, which can reduce a pivoting area around a drive shaft. is there.

  A wiper arm biasing member for solving the above problems has a drive shaft rotated about a first axis by a drive device, and a tip end portion of the drive shaft has a positional relationship of crossing or twisting with the first axis. A tilting portion supported so as to be pivotable about an axis and coupled to the wiper arm or integrally formed with the wiper arm, and rotatably supported about a third axis along the second axis at an intermediate portion of the drive shaft The drive shaft is inserted through the lower support member, the upper support member rotatably supported by the tilting portion about a fourth axis parallel to the third axis, and the inner side. And a coil spring which is supported by the lower support member to apply a biasing force to the upper support member.

  According to the same configuration, the coil spring that applies the biasing force to the tilting portion and thus the wiper arm is disposed so that the drive shaft is inserted inside, and therefore, the coil arm is disposed inside the wiper arm compared to the wiper arm. Can be miniaturized (thinned). Furthermore, the rotation area around the drive shaft can be made smaller than that in which the coil spring and the drive shaft are arranged in line in the radial direction outer side of the drive shaft.

In the wiper arm biasing member, it is preferable that the coil spring be set so as to increase in diameter toward the distal end side of the drive shaft.
According to the same configuration, the coil spring is set such that the diameter increases toward the distal end side of the drive shaft, so that the diameter of the proximal end that does not largely fluctuate with respect to the drive shaft can be reduced. The rotation area around the drive shaft on the proximal side can be further reduced.

In the wiper arm biasing member, it is preferable that at least a part of the coil spring be set so as to overlap in the axial direction of the spring in the most contracted state.
According to the configuration, at least a part of the coil spring is set so as to overlap in the spring axial direction in the most contracted state, so a strong biasing force can be applied while shortening the length of the coil axial direction. It can be used.

  In the wiper arm biasing member, the upper end of the coil spring is arranged such that the distance from the spring axis of the coil spring is shorter on the opposite side of the extending direction of the wiper arm than the extending direction of the wiper arm. Preferably, it is connected to the support member.

  According to the same configuration, the upper end of the coil spring is connected to the upper support member such that the distance from the spring axis of the coil spring is shorter on the opposite side of the extending direction of the wiper arm than the extending direction of the wiper arm. Therefore, the upper end of the coil spring can be prevented from being separated from the drive shaft more than necessary, and the rotation area around the drive shaft can be further reduced.

In the wiper arm biasing member, the lower support member and the upper support member are preferably formed in an annular shape so that the drive shaft is inserted inside.
According to the same configuration, the lower support member and the upper support member are annularly formed so that the drive shaft is inserted inside, so that, for example, the lower support member and the upper support member are connected well to both ends of the coil spring ) Can be. That is, for example, in the case where the lower support member (or the upper support member) has a shape in which a pair of the lower support member is provided and separated with the drive shaft interposed therebetween, the end of the coil spring enters and is unstable while separated There is a risk of being connected (pressing contact) to the Moreover, since it is formed annularly, the lower side support member and the upper side support member can be made high in strength.

  In the wiper arm biasing member, the upper support member has an upper support piece projecting toward the lower support member, and a distance from a spring axis of the coil spring to an outer peripheral surface of the upper support piece Is smaller than the distance from the spring axis of the coil spring to the inner peripheral surface of the upper end of the coil spring or equal to the distance from the spring axis of the coil spring to the inner peripheral surface of the upper end of the coil spring It is preferable that it is set.

  According to the same configuration, the distance from the spring axis of the coil spring to the outer peripheral surface of the upper support piece is smaller than the distance from the spring axis of the coil spring to the inner peripheral surface of the upper end of the coil spring or from the spring axis of the coil spring Since the distance to the inner peripheral surface of the upper end of the coil spring is set to be the same, rattling in the radial direction between the upper support member and the coil spring can be suppressed.

  In the wiper arm biasing member, the lower support member has a lower support piece projecting toward the upper support member, and from the spring axis of the coil spring to the outer peripheral surface of the lower support piece Is smaller than the distance from the spring axis of the coil spring to the inner peripheral surface of the lower end of the coil spring or equal to the distance from the spring axis of the coil spring to the inner peripheral surface of the lower end of the coil spring It is preferable that the setting is made as follows.

  According to the same configuration, the distance from the axis of the coil spring to the outer peripheral surface of the lower support piece is smaller than the distance from the spring axis of the coil spring to the inner peripheral surface of the lower end of the coil spring or from the spring axis of the coil spring Since the distance to the inner peripheral surface of the lower end of the coil spring is set to be the same, it is possible to suppress rattling in the radial direction between the lower support member and the coil spring.

  In the biasing member of the wiper arm, it is preferable that a projecting length of at least one of the upper support piece and the lower support piece is set to be longer than a half of a wire diameter of the coil spring.

  According to the same configuration, since the projection length of at least one of the upper and lower support pieces is set to be larger than half the wire diameter of the coil spring, the upper and lower support pieces are The coil spring can be preferably brought into contact with at least one, and the positional deviation between at least one of the upper and lower support members and the coil spring in the radial direction can be suitably suppressed.

A vehicle wiper device which solves the above-mentioned subject is provided with the above-mentioned wiper arm energizing member and the above-mentioned drive.
According to the same configuration, the above-described effect can be obtained in the vehicle wiper device provided with the wiper arm biasing member and the drive device.

  In the wiper arm biasing member and the wiper apparatus for a vehicle according to the present invention, the rotation area around the drive shaft can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS The perspective view of the wiper apparatus for vehicles in one Embodiment. The side view of the wiper arm biasing member in one embodiment. The side view of the wiper arm biasing member in one embodiment. The side view of the wiper arm biasing member in one embodiment. The perspective view of the wiper arm biasing member in another example. The side view of the wiper arm biasing member in another example. The side view of the wiper arm biasing member in another example.

An embodiment of the present invention will now be described with reference to FIGS. 1 to 4.
As shown in FIG. 1, the vehicle wiper device includes a drive K and a wiper arm biasing member F, and is disposed in the vicinity of a front window or a rear window (not shown) as a wiping surface.

The drive device K includes a motor (not shown), and reciprocates the drive shaft 11 about the first axis X1 in a range of, for example, 90 ° directly or via a link mechanism or the like.
As shown in FIGS. 1 to 4, the wiper arm biasing member F is a position where the base member 12 fixed to the tip (upper end) of the drive shaft 11 intersects the first axis X1 with the base member 12. It has a tilting member 13 as a tilting portion provided with a wiper fixing portion 13a supported so as to be tiltable about the second axis X2 in relation and for fixing the wiper arm WA. In the present embodiment, the first axis X1 and the second axis X2 are orthogonal to each other. The wiper arm WA has an arm head WAa and a pipe-like arm piece WAb further extending from the tip end of the arm head WAa, and constitutes a vehicle wiper together with a wiper blade (not shown) connected to the tip of the arm piece WAb. ing.

  As shown in FIG. 2, the base member 12 extends from the tip end of the drive shaft 11 toward the extension direction of the wiper arm WA (the tip side of the wiper arm WA in the longitudinal direction of the wiper arm WA) A first restriction which extends from the portion 12d to the wiper arm WA side (upper side in the vertical direction) and restricts the tilting member 13 (and thus the wiper arm WA) in a first direction (direction in which the wiper arm WA approaches the wiping surface) at a constant position. And a unit 12a. FIG. 2 shows a state in which the wiper blade (a blade rubber (not shown) of the wiper blade) is in contact with the wiping surface and the tilting member 13 is not in contact with the first restricting portion 12a (in front of contact). The state is illustrated.

  Further, as shown in FIG. 3, the base member 12 extends from the tip end of the drive shaft 11 in the direction opposite to the extending direction of the wiper arm WA (proximal end side of the wiper arm WA in the longitudinal direction of the wiper arm WA) A second restricting portion 12b restricts the tilt of the member 13 (and the wiper arm WA) in the second direction (the direction in which the wiper blade moves away from the wiping surface) at a constant position. FIG. 3 illustrates a so-called lockback state in which the tilting member 13 is in contact with the second restricting portion 12b. Further, the second restricting portion 12 b has an inclined surface which comes in surface contact with the tilting member 13 (upper wall 13 c described later) when in contact with the tilting member 13. As a result, the load due to the tilting of the tilting member 13 in the second direction can be received by the inclined surface of the second restricting portion 12b, so that the load can be dispersed, and the tilting member 13 and the base member 12 (second It is possible to suppress concentration of load on the restriction portion 12b).

  The tilting member 13 has a pair of side walls 13b rotatably supported at both ends of a tilting shaft 12c projecting from the base member 12 in the direction of the second axis X2, and an upper wall 13c connecting the upper ends of the pair of side walls 13b. And the wiper fixing portion 13a is formed on the upper wall 13c. In the wiper fixing portion 13a of the present embodiment, a female screw is formed on the inner peripheral surface of a cylindrical portion protruding upward from the upper wall. The wiper arm WA (arm head WAa) is fixed to the tilting member 13 by a bolt 14 which penetrates the base end and is screwed to the wiper fixing portion 13a (female screw).

Further, on the pair of side walls 13b of the tilting member 13, an extending portion 13d is formed to extend obliquely downward in the opposite direction to the direction in which the wiper arm WA extends.
The wiper arm biasing member F is provided at the middle portion of the drive shaft 11 with the lower support member 15 rotatably supported about the third axis X3 parallel to the second axis X2 and the extension of the tilting member 13. The installation portion 13d is provided with an upper support member 16 rotatably supported at the center of a fourth axis X4 parallel to the second axis X2. The upper support member 16 is positioned closer to the tip end side (vertically upper side) of the drive shaft 11 than the lower support member 15.

  The lower support member 15 is formed in an annular shape (disk shape) so that the drive shaft 11 is inserted inside, and the middle portion of the drive shaft 11 is formed at both ends of the support pin 17 penetrating in the direction of the third axis X3. It is rotatably supported. The inner periphery 15a of the lower support member 15 formed in an annular shape is formed in a substantially oval shape (a shape formed of a pair of parallel straight lines and a curve connecting those end portions), and the longitudinal direction of the inner periphery 15a The direction (along the straight line) is set to be the direction orthogonal to the third axis X3. In addition, a support piece 15b as a lower support piece is formed on the upper surface of the lower support member 15 (the surface on the side facing the upper support member 16) projecting upward from the inner edge (the upper support member 16 side). There is. The outer diameter of the support piece 15 b is set to be larger than the inner circumference 15 a and smaller than the outer diameter of the lower support member 15. More specifically, the outer diameter of the support piece 15b is slightly smaller than the inner diameter (shortest inner diameter) of the lower end (proximal end side of the drive shaft 11) of the compression coil spring 19 described later It is set to be the same (see FIG. 4). In other words, the length from the spring axis X5 described later to the outer peripheral surface of the support piece 15b is slightly smaller than the length from the spring axis X5 to the inner peripheral surface (innermost peripheral surface) of the lower end of the compression coil spring 19 The length from X5 to the inner peripheral surface of the lower end of the compression coil spring 19 is set to be the same.

  The upper support member 16 has an outer diameter larger than that of the lower support member 15, and is formed in an annular shape (disk shape) so that the drive shaft 11 can be inserted inside, and the extension portion 13d of the tilting member 13 It is rotatably supported by support pins 18 penetrating in the direction of the four axes X4. The inner periphery 16a of the upper side support member 16 formed in a ring shape is formed in a substantially oval shape (a shape formed by a pair of parallel straight lines and a curve connecting those end portions), and the longitudinal direction of the inner periphery 16a The direction along the straight line is set to be the direction orthogonal to the fourth axis X4. Further, on the lower surface (the surface on the side opposite to the lower support member 15) of the upper support member 16, a support piece 16b as an upper support piece projecting downward from the inner edge (on the lower support member 15 side) is formed. There is. The outer diameter of the support piece 16 b is set to be larger than the inner circumference 16 a and smaller than the outer diameter of the upper support member 16. More specifically, the outer diameter of the support piece 16b is slightly smaller than the inner diameter (shortest inner diameter) of the upper end (the tip end side of the drive shaft 11) of the compression coil spring 19 described later Is set to be (see FIG. 4). In other words, the length from the spring axis X5 to the outer peripheral surface of the support piece 16b is slightly smaller than the length from the spring axis X5 to the inner peripheral surface (innermost peripheral surface) of the upper end of the compression coil spring 19 or from the spring axis X5 The length is set to be equal to the length to the inner peripheral surface of the upper end of the compression coil spring 19.

  The wiper arm biasing member F is disposed so that the drive shaft 11 is inserted inside, and is supported between the lower support member 15 and the upper support member to bias the tilting member 13 (wiper arm WA). And a compression coil spring 19 as a coil spring for applying The compression coil spring 19 of this embodiment is a coil spring of a round wire whose cross-sectional shape is circular. The coil spring is not limited to a round coil spring, and may be, for example, a square spring having a square or rectangular cross-sectional shape.

  The compression coil spring 19 of the present embodiment is set such that the diameter increases toward the tip end side (upper end side) of the drive shaft 11, and between the upper surface of the lower support member 15 and the lower surface of the upper support member 16. It is arranged in a compressed state. In other words, the compression coil spring 19 of the present embodiment is a conical coil spring having a conical shape in which the diameter on the distal end side of the drive shaft 11 is larger than the diameter on the proximal end side of the drive shaft 11. Further, the both end portions of the compression coil spring 19 are prevented from being displaced in the radial direction between the lower support member 15 and the upper support member 16 because the inner peripheral side thereof abuts against the support pieces 15b and 16b. The protruding lengths of the support pieces 15b and 16b in the present embodiment are set to be longer than half (radius) of the wire diameter of the compression coil spring 19 and equal to or less than the wire diameter of the compression coil spring 19 (see FIG. 4).

  Further, as shown in FIG. 4, the compression coil spring 19 according to the present embodiment is in the most contracted state, and a part of itself (of the wire) is in the axial direction of the spring axis X5 (the expansion and contraction direction of the compression coil spring 19). It is set to overlap. That is, since the compression coil spring 19 of the present embodiment is set so that the diameter increases toward the tip end side (upper end side) of the drive shaft 11, the lower part (wire) is the upper part (wire It is possible to enter inside the), and at least in the most contracted state, the lower part is set inside the upper part. FIG. 4 shows a state in which the second axis X2, the third axis X3, and the fourth axis X4 are aligned in a straight line, and the compression coil spring 19 tilts the tilting member 13 in the first direction (the wiper blade The drawing shows a state in which the compression coil spring 19 is contracted most in a state in which it is not biased in the second direction (the direction in which the wiper blade separates from the wiping surface) or the second direction (the direction in which the wiper blade separates from the wiping surface). The spring axis X5 is a straight line passing through the center of the compression coil spring 19, and in the present embodiment, as shown in FIGS. 2 to 4, it coincides with the straight line connecting the third axis X3 and the fourth axis X4. There is.

Next, the operation of the vehicle wiper device (wiper arm biasing member F) configured as described above will be described.
As shown in FIG. 2, the wiper arm biasing member F is in a state in which the wiper blade (blade rubber) is in contact with the wiping surface, and the tilting member 13 is not in contact with the first regulating portion 12a (abutment) In the front state, the tilting member 13 (and hence the wiper arm WA) is biased in the first direction (the direction in which the wiper blade approaches the wiping surface). As a result, the wiper blade (blade rubber) is pressed into contact with the wiping surface. By driving the motor while the wiper blade (blade rubber) is in pressure contact with the wiping surface as described above, the drive shaft 11 rotates and the wiper arm WA and the wiper blade connected to the tip of the wiper arm WA shake. It is moved and the wiping surface is wiped away. When the drive shaft 11 rotates, the compression coil spring 19 also rotates in the same manner.

  Further, as shown in FIG. 3, the wiper arm biasing member F is in a state where the wiper arm WA is erected (locked back), and in a state where the tilting member 13 is in contact with the second restricting portion 12b. The tilting member 13 (and thus the wiper arm WA) is biased in the second direction (the direction in which the wiper blade is separated from the wiping surface). This holds the lockback state.

Next, the effects of the above embodiment will be described below.
(1) The compression coil spring 19 which biases the tilting member 13 and thus the wiper arm WA is disposed so that the drive shaft 11 is inserted inside, so that the compression coil spring 19 is disposed inside the wiper arm as compared with that. Thus, the wiper arm WA can be miniaturized (thinned). Further, as compared with the case where the compression coil spring 19 and the drive shaft 11 are arranged side by side in the radial direction of the drive shaft 11, the rotation area around the drive shaft 11 can be made smaller. Therefore, for example, the space required when mounting in a vehicle becomes small, and the mounting property becomes good.

  (2) The diameter of the compression coil spring 19 is set to increase as it goes to the tip end side of the drive shaft 11, so that the diameter of the proximal end which does not largely fluctuate with respect to the drive shaft 11 can be reduced. The rotation area around the drive shaft 11 on the proximal end side can be further reduced.

  (3) The compression coil spring 19 is set so that a part thereof overlaps the direction of the spring axis X5 (the expansion and contraction direction of the compression coil spring 19) in the most contracted state. A strong biasing force can be used while shortening.

  (4) The lower support member 15 and the upper support member 16 are annularly formed so that the drive shaft 11 is inserted into the inside, so for example, they are well connected (pressing contact) with both ends of the compression coil spring 19 It can be done. That is, for example, in the case where the lower support member 15 (or the upper support member 16) is provided in a pair so as to sandwich the drive shaft 11, the end of the compression coil spring 19 is There is a risk that the parts (ends of the wire) may enter and become unstable and connect (press and contact), but this is not the case. Moreover, since it forms in cyclic | annular form, the lower side support member 15 and the upper side support member 16 can be made high in strength.

  (5) The length (distance) from the spring axis X5 to the outer peripheral surface of the support piece 15b is slightly longer than the length from the spring axis X5 to the inner peripheral surface of the lower end of the compression coil spring 19 (proximal end of the drive shaft 11) It is set to be smaller or equal to the length from the spring axis X5 to the inner peripheral surface of the lower end of the compression coil spring 19, and the length from the spring axis X5 to the outer peripheral surface of the support piece 16b is from the spring axis X5 to the compression coil The length from the spring axis X5 to the inner peripheral surface of the upper end (the tip end of the drive shaft 11) of the compression coil spring 19 is slightly smaller than the length to the inner peripheral surface of the upper end of the spring 19 (the tip end of the drive shaft 11) Since it sets so that it may become, it can suppress the rattling in the radial direction of the lower side support member 15 and the upper side support member 16, and the compression coiled spring 19. As shown in FIG.

  (6) The protruding lengths of the support pieces 15b and 16b are set to be larger than half of the wire diameter of the compression coil spring 19, so that the support pieces 15b and 16b and the compression coil spring 19 preferably abut each other. The positional deviation in the radial direction between the lower support member and the upper support member, and the compression coil spring 19 can be suitably suppressed.

The above embodiment may be modified as follows.
In the above embodiment, the upper end of the compression coil spring 19 has a distance from the spring axis X5 in the extending direction of the wiper arm WA (the tip end side of the wiper arm WA) and the opposite direction (the base end side of the wiper arm WA) The upper support member 16 is illustrated as being connected (supported) to the upper support member 16 so as to be the same in the above, but the distance from the spring axis X5 is shorter on the opposite side than the extending direction of the wiper arm WA. It may be linked to

  Specifically, for example, it may be changed as shown in FIGS. The upper support member 21 in this example is formed such that the length from the spring axis X5 to the outer peripheral surface of the upper support member 21 and the inner periphery 21a is shorter on the opposite side than the extending direction of the wiper arm WA. There is. The upper end of the compression coil spring 19 is connected (supported) to the upper support member 21 such that the distance from the spring axis X5 is shorter on the opposite side than the extending direction of the wiper arm WA. As shown in FIGS. 6 and 7, the spring axis X5 coincides with the straight line connecting the third axis X3 and the fourth axis X4. Therefore, the upper support member 21 is formed such that the length from the fourth axis X4 to the outer peripheral surface and the inner periphery 21a of the upper support member 21 is shorter on the opposite side than the extending direction of the wiper arm WA. ing. The upper end of the compression coil spring 19 is connected (supported) to the upper support member 21 so that the distance from the fourth axis X4 is shorter on the opposite side than the extending direction of the wiper arm WA.

  In this way, the upper end of the compression coil spring 19 can be prevented from being separated from the drive shaft 11 more than necessary, and the rotation area around the drive shaft 11 can be made smaller. Specifically, as shown in FIG. 7, the upper end of the compression coil spring 19 opposite to the extending direction of the wiper arm WA does not contact the drive shaft 11 even in the lockback state even if the distance from the spring axis X5 is short. Therefore, the rotation area around the drive shaft 11 can be made smaller by adopting the above configuration.

  In the above embodiment, the compression coil spring 19 has a conical shape in which the diameter increases toward the distal end side of the drive shaft 11. However, the present invention is not limited to this. It is also good. Also, barrel-shaped compression coil springs (barrel-shaped coil springs) whose diameters decrease as they move toward the ends of the expansion / contraction direction, and hourglass-shaped compression coil springs (hour-shaped coil springs) whose diameters increase as they move toward the ends of the expansion / contraction direction You may change it. When the barrel-shaped coil spring and the hourglass-shaped coil spring are compressed similarly to the conical compression coil spring 19, a part thereof can be made to overlap in the expansion and contraction direction (direction of the spring axis X5).

  In the above embodiment, the compression coil springs 19 are set so as to partially overlap in the axial direction in the most contracted state, but the invention is not limited thereto, and does not overlap in the axial direction even in the most contracted state. It may be set as In addition, when it is set as a compression coiled spring with a fixed diameter, it will not overlap in the axial direction inevitably.

  Further, when the wiper blade is pressed against the wiping surface (the state of FIG. 2), a part of the compression coil spring is set to overlap in the axial direction of the spring axis X5 (the expansion and contraction direction of the compression coil spring). May be At that time, in the state where the compression coil spring is most contracted, the area overlapping in the axial direction of the spring axis X5 is set to be increased. In this way, the length of the compression coil spring in the expansion / contraction direction can be further shortened.

  In the above embodiment, the lower support member 15 and the upper support member 16 are formed in an annular shape so that the drive shaft 11 is inserted inside, but the invention is not limited to this, and the lower support member 15 and the upper support member 16 may be formed in an annular shape For example, the lower support member 15 (or the upper support member 16) may be provided in a pair so as to sandwich the drive shaft 11 and be separated.

  In the above embodiment, the wiper arm WA can be held in the lockback state. However, the invention is not limited thereto. For example, the tilt member 13 can not be tilted in the second direction until the lockback state is achieved. It may be a second control unit.

  In the above embodiment, the tilting member 13 is tiltably supported at the center of the second axis X2 that is in the positional relationship of intersection with the first axis X1, but the tilting member 13 has the positional relationship of torsion with the first axis X1 It may be configured to be tiltably supported about the two axes.

  In the above embodiment, although the second axis is parallel to the third axis and the fourth axis, the present invention is not limited to this. The third axis and the fourth axis may be in a direction along the second axis, and may be slightly deviated from parallel.

  -In the said embodiment, although arm piece WAb presupposed that it is a pipe shape, it is not limited to this. For example, the arm piece may be substantially U-shaped open on the wiping surface side. Also, the arm piece may be in the form of a solid rod.

  In the above embodiment, the tilting member 13 as the tilting portion and the wiper arm WA (arm head WAa) are provided as separate parts, but the invention is not limited thereto, and the tilting member and the wiper arm (arm head) are integrally formed. It may be provided as a tilting unit. In this case, since the tilting member and the wiper arm (arm head) are integrally formed, the wiper fixing portion 13a and the bolt 14 for fixing the tilting member 13 and the wiper arm WA can be omitted. Therefore, the number of parts and the number of assembling steps can be reduced.

  In the above embodiment, the protruding lengths of the support pieces 15b and 16b are set to be larger than half of the wire diameter of the compression coil spring 19. However, the present invention is not limited to this. For example, the protruding length of each of the support pieces 15 b and 16 b may be equal to or less than half the diameter of the compression coil spring 19. Further, the projection length of the support piece 15b may be set to half or less of the wire diameter of the compression coil spring 19, and the projection length of the support piece 16b may be set larger than half the wire diameter.

  In the above embodiment, the lower support member 15 and the upper support member 16 are provided with the support pieces 15b and 16b, respectively. However, the support pieces 15b and 16b may not be provided.

  11: drive shaft, 13: tilting member (tilting portion), 15: lower support member, 15b: support piece (lower support piece), 16, 21: upper support member, 16b: support piece (upper support piece) 19 ... compression coil spring (coil spring), F ... wiper arm biasing member, K ... drive device, WA ... wiper arm, X1 to X4 ... first to fourth axes, X5 ... spring axis.

Claims (9)

A drive shaft which is rotated about the first axis by a drive device;
A tilting portion which is tiltably supported at a distal end portion of the drive shaft at a second axial center which is in a positional relationship of intersecting or twisting with the first axis and is connected to the wiper arm or integrally formed with the wiper arm;
A lower support member rotatably supported at a middle portion of the drive shaft about a third axis along the second axis;
An upper support member rotatably supported by the tilting portion about a fourth axis parallel to the third axis;
A wiper arm biasing member characterized in that the drive shaft is inserted inside and a coil spring supported by the lower support member to apply an urging force to the upper support member.   The wiper arm biasing member according to claim 1, wherein the coil spring is set to increase in diameter toward the tip end side of the drive shaft.   The wiper arm biasing member according to claim 1 or 2, wherein at least a part of the coil spring is set so as to overlap in the axial direction of the spring in the most contracted state.   The upper end of the coil spring is connected to the upper support member such that the distance from the spring axis of the coil spring is shorter on the opposite side of the extending direction of the wiper arm than the extending direction of the wiper arm. The wiper arm biasing member according to any one of claims 1 to 3, wherein   The wiper arm biasing member according to any one of claims 1 to 4, wherein the lower support member and the upper support member are formed in an annular shape so that the drive shaft is inserted inside. . The upper support member has an upper support piece projecting toward the lower support member,
The distance from the spring axis of the coil spring to the outer peripheral surface of the upper support piece is smaller than the distance from the spring axis of the coil spring to the inner peripheral surface of the upper end of the coil spring, or from the spring axis of the coil spring The wiper arm biasing member according to any one of claims 1 to 5, wherein the distance is set to be equal to the distance to the inner peripheral surface of the upper end of the coil spring. The lower support member has a lower support piece projecting toward the upper support member,
The distance from the spring axis of the coil spring to the outer peripheral surface of the lower support piece is smaller than the distance from the spring axis of the coil spring to the inner peripheral surface of the lower end of the coil spring or from the spring axis of the coil spring The wiper arm biasing member according to any one of claims 1 to 6, wherein the distance is set to be equal to the distance to the inner peripheral surface of the lower end of the coil spring.   7. The method according to claim 6, wherein the projection length of at least one of the upper support piece and the lower support piece is set to be longer than a half of the wire diameter of the coil spring. The wiper arm biasing member according to claim 1.   A wiper apparatus for a vehicle comprising the wiper arm biasing member according to any one of claims 1 to 8 and the drive device.