JP2007196935A - Motion conversion mechanism and vehicular wiper device provided therewith - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify a structure of a motion conversion mechanism by maintaining the engagement state of a pivot gear and a pinion gear without providing a connection plate as conventional. <P>SOLUTION: The motion conversion mechanism for converting rotation action of a motor output shaft Ms to reciprocation action of a predetermined constitution element is provided with a worm wheel 2 rotatably supported on a housing case, having a tooth part 2g engaged with a worm Mg of an outer peripheral part of the motor output shaft and a first projection body 2p at a portion spaced from a rotation center by a predetermined amount; the pivot gear 3 having a first engagement part 3k engaged with the first projection body and reciprocally acted by rotation of the worm wheel; and a pinion gear 4 engaged with a rack tooth part 3g of the pivot gear to perform reciprocation turning action. A second projection body 3p is provided on the pivot gear and a second engagement part 1k is provided on the housing case respectively. The pivot gear performs the reciprocation rocking action by engaging the second projection body and the second engagement part while guiding to each other. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a motion conversion mechanism that converts a rotational operation of a motor output shaft into a reciprocating operation of a predetermined component, and a wiper device for a vehicle that includes the motion conversion mechanism.

As is well known, in a vehicle wiper device for wiping a window glass of a vehicle, a wiping member for wiping the window glass is supported by a wiper arm, and the wiper arm is reciprocally swung by a motor-driven drive device. (For example, refer to Patent Document 1).
As described above, the drive device incorporated in the wiper device requires a motion conversion mechanism that converts the rotation operation of the motor output shaft into the reciprocating operation of predetermined components in the wiper drive device.

  In the wiper device disclosed in Patent Document 1, a worm wheel that engages with a worm formed on the outer peripheral portion of a motor output shaft, a crank arm, a sector gear, and a pinion gear coupled to the wiper arm are provided in the housing case, and further oscillated. A synthetic resin connecting plate is provided to connect the sector gear (oscillating gear) and the pinion gear, and the support wall is formed with the leading edge of this connecting plate being part of the inner surface of the housing case. It is comprised so that it may slidably contact.

According to this conventional configuration, when a large external load is applied to the pinion gear and a force that disengages the rocking gear is generated, this force is applied to the connecting plate. Therefore, the force applied to the connecting plate is not received by the connecting plate alone, but can be received in cooperation with the connecting plate and the support wall. As a result, it is not necessary to keep the strength and rigidity of the connecting plate as high as before, and the motor device can be reduced in size and weight.
JP 2000-310309 A

  However, in the prior art as well, in order to reliably maintain the meshing state of the oscillating gear and the pinion gear, a connecting plate is still necessary, which simplifies the structure of the motion conversion mechanism and hence the structure of the drive system of the wiper device. Above, this was a bottleneck.

  Therefore, the basic object of the present invention is to simplify the structure of the motion conversion mechanism by maintaining the meshed state of the swing gear and the pinion gear without the need for providing a connecting plate as in the prior art. It was made as.

  For this reason, the motion conversion mechanism according to the present invention is a motion conversion mechanism that converts the rotation operation of the motor output shaft into a reciprocating operation of a predetermined component, and includes a worm formed on the outer periphery of the motor output shaft, a housing A worm wheel that is rotatably supported with respect to the case, has a tooth portion that meshes with the worm, and is provided with a first protrusion at a predetermined distance from the center of rotation, and engages the first protrusion. A reciprocating member having a first engaging portion and reciprocatingly operated by the rotation of the worm wheel; and a pinion gear engaging with a rack tooth portion provided on the reciprocating member to perform a reciprocating rotation operation; A second protrusion is provided on one of the housing case and the reciprocating member, and a second engagement portion that engages with the second protrusion is provided on either one of the housing case and the reciprocating member. By protrusions and said second engagement portion is engaged with the guide each other, it said reciprocating element is one that was characterized by performing a reciprocating operation.

  In this case, the reciprocating member includes a gear body portion having the rack tooth portion and extending substantially linearly, and an engagement body portion having the first engagement portion and extending substantially linearly, The gear main body portion and the engagement main body portion are connected so as to cross at substantially right angles, the first engagement portion is formed in a groove shape, and the first protrusion is formed in the groove-shaped first shape. It is preferably formed in a pin shape that is slidably guided by one engaging portion.

  In this case, it is more preferable that the engagement main body portion and the gear main body portion are substantially T-shaped.

  Further, a vehicle wiper device according to the present invention includes a wiping member that wipes a window glass of a vehicle, a wiper arm that supports the wiping member, and a drive device that includes a motor that drives the wiper arm. And the said drive device is provided with the motion conversion mechanism as described in any one of Claims 1-3, The said pinion gearwheel is couple | bonded with the said wiper arm, It is characterized by the above-mentioned.

According to the motion conversion mechanism of the present invention, the reciprocating member having the first engaging portion that engages with the first protrusion of the worm wheel and reciprocating by the rotation of the worm wheel includes the housing case and the reciprocating member. Since the second protrusion provided on one of the two and the second engaging portion provided on the other engage with each other while guiding each other, the reciprocating operation is performed. The rack tooth portion can reliably maintain the meshed state with the pinion gear without the need to provide a connecting plate as in the prior art.
Therefore, it is possible to reduce the number of parts compared to the conventional case, thereby simplifying the structure of the motion conversion mechanism, reducing the number of assembly steps, and contributing to the reduction of manufacturing costs. it can.

  In this case, preferably, the reciprocating member includes a gear body portion having the rack tooth portion and extending substantially linearly, and an engagement body portion having the first engagement portion and extending substantially linearly, The gear main body portion and the engagement main body portion are connected so as to intersect at a substantially right angle, the first engagement portion is formed in a groove shape, and the first protrusion is formed in a pin shape to form the groove-shaped first engagement member. By being guided slidably by the joint, the reciprocating operation of the reciprocating member can be performed more smoothly and with low noise.

  In this case, more preferably, the engagement main body portion and the gear main body portion of the reciprocating member have a substantially T-shape so that the balance of the reciprocating member is improved and smoother reciprocation is achieved. Operation is obtained. Further, the layout around the pinion gear is improved, and the degree of freedom in design can be increased.

  Further, according to the vehicle wiper device of the present invention, the drive device having the motor for driving the wiper arm includes the motion conversion mechanism described above, so that the window can be moved by the reciprocating motion of the wiper arm coupled to the pinion gear. When wiping the glass, the same effects as those described above can be achieved. Thereby, the structure of a wiper apparatus can be simplified and the size reduction and weight reduction can be achieved.

  Hereinafter, an embodiment of a motion conversion mechanism of the present invention will be described in detail with reference to the accompanying drawings, taking as an example a case where it is applied to a drive system of a vehicle wiper device.

First, a first embodiment of the present invention will be described.
FIGS. 1-4 is explanatory drawing which shows roughly the structure and series of operation | movement of the drive device of the wiper apparatus for vehicles which concern on 1st Embodiment of this invention.
As shown in these drawings, the drive device according to the present embodiment includes a housing case 1 that houses a required drive element, and power is supplied to the drive element in the housing case 1 in the vicinity of the outside of the housing case 1. The electric motor M to be applied is fixed. A worm Mg is formed on the outer periphery of the output shaft Ms of the electric motor M.

  A worm wheel 2 having a tooth portion 2g that is rotatably supported with respect to the housing case 1 via a pivot shaft 2s and meshes with the worm Mg is disposed in the housing case 1. The worm wheel 2 is integrally provided with a pin-like protrusion 2p (first protrusion) at a position spaced by a predetermined amount from the center of rotation (center of the pivot shaft 2s).

Further, the housing case 1 has an engaging portion 3k (first engaging portion) that engages with the first protrusion 2p, and swings as a reciprocating member that reciprocates as the worm wheel 2 rotates. A moving gear 3 is provided. Specifically, the first engaging portion 3k includes an insertion hole into which the pin-shaped first protrusion 2p is inserted.
A rack tooth portion 3g is formed in the swing gear 3, and a pinion gear 4 that engages with the rack tooth portion 3g and performs a reciprocating rotation operation is disposed in the vicinity of the swing gear 3.

The pinion gear 4 is rotatably supported with respect to the housing case 1 via a gear shaft 4s, and a wiping member (not shown) for wiping a window glass (not shown) of the vehicle is supported on the gear shaft 4s. A wiper arm W is coupled.
Therefore, when the pinion gear 4 performs a reciprocating rotation operation, the wiper arm W performs a reciprocating rotation operation, and the window glass (not illustrated) of the vehicle is wiped by a wiping member (not illustrated).

In the present embodiment, the rocking gear 3 is integrally provided with a pin-like protrusion 3p (second protrusion) that protrudes toward the back side in the figure, and the housing case 1 has the second protrusion 3p. An engagement portion 1k (second engagement portion) is provided to engage with. Specifically, the second engaging portion 1k is configured as a concave guide groove portion that slidably guides the pin-shaped second protrusion 3p.
When the worm wheel 2 rotates, the second protrusion 3p and the second engaging portion 1k engage with each other while guiding each other, so that the rocking gear 3 reciprocates along a predetermined locus. It is designed to perform dynamic movement.

  FIG. 1 shows a state in which the wiper arm W is in a left inclined position inclined leftward in the drawing from the neutral position. From this state, the first protrusion 2p of the worm wheel 2 is rotated by the rotation of the motor output shaft Ms ( That is, the first engaging portion 3k of the swing gear 3 rotates in the direction of arrow A1, and the swing operation of the swing gear 3 accompanying this swings the rack tooth portion 3g in the direction of arrow A2. At this time, the second protrusion 3p of the swing gear 3 and the second engaging portion 1k (concave guide groove) of the housing case 1 are engaged with each other while being guided, whereby the swing gear 3 is in a predetermined state. Swing operation is performed along the trajectory.

  Then, the rotation of the motor output shaft Ms causes the first protrusion 2p of the worm wheel 2 to continue to rotate in the direction of the arrow A1, so that the wiper arm W passes through the neutral position (first neutral position) shown in FIG. It reaches the right inclined position inclined to the right shown in. Further, the rotation of the motor output shaft Ms causes the first protrusion 2p of the worm wheel 2 to continue to rotate in the direction of the arrow A1, so that the wiper arm W is reversed and passes through the neutral position (second neutral position) shown in FIG. Return to the right inclined position inclined rightward as shown in FIG. While the motor output shaft Ms continues to rotate, the rotation operation of the motor output shaft Ms is converted into the reciprocating rotation operation of the pinion gear 4, and the series of operations shown in FIGS. 1 to 4 are repeated. Yes.

  As described above, according to the present embodiment, the first engagement portion 3k that engages with the first protrusion 2p of the worm wheel 2 and the reciprocating swing operation by the rotation of the worm wheel 2 The gear 3 engages in a reciprocating rocking motion by engaging the second protrusion 3p provided on the rocking gear 3 and the housing case 1 second engaging portion 1k (concave guide groove) while guiding each other. Therefore, the rack tooth portion 3g provided on the swing gear 3 can reliably maintain the meshed state with the pinion gear 4 without the need to provide a connecting plate as in the prior art.

  Therefore, the number of parts can be reduced as compared with the prior art, and the structure of the motion conversion mechanism that converts the rotation operation of the motor output shaft Ms into the reciprocating rotation operation of the pinion gear 4 can be simplified. Also, the number of assembly steps can be reduced, which can contribute to a reduction in manufacturing cost. As a result, the structure of the wiper device that wipes the window glass (not shown) by the reciprocating motion of the wiper arm W coupled to the pinion gear 4 can be simplified and reduced in size and weight.

Next, a second embodiment of the present invention will be described.
In the above-described first embodiment, the rocking gear 3 is provided with the pin-shaped second protrusion 3p, and the housing case 1 is provided with the second engagement portion 1k that is a concave groove that engages with the second protrusion 3p. However, in the second embodiment, the housing case is provided with the second protrusion, and the swing gear is provided with the second engaging portion.
In the following description, components having the same configuration as those in the first embodiment and having the same functions are denoted by the same reference numerals, and further description thereof is omitted.

5-8 is explanatory drawing which shows roughly the structure and series of operation | movement of the drive device of the wiper apparatus for vehicles which concern on 2nd Embodiment of this invention.
As shown in these drawings, in the present embodiment, a pin-shaped second protrusion 11p is integrally provided in the housing case 11, and the second protrusion 11p is engaged with the swing gear 13 in the first manner. Two engaging portions 13k2 are provided. Specifically, the second engagement portion 13k2 is configured as a guide slot portion that is slidably guided by inserting the pin-shaped second protrusion 11p.
When the worm wheel 2 rotates, the second protrusion 11p and the second engaging portion 13k2 engage with each other while guiding each other, so that the rocking gear 13 reciprocates along a predetermined locus. Accordingly, the pinion gear 14 that meshes with the rack tooth portion 13g of the swing gear 13 performs a reciprocating rotation operation.

  The worm wheel 12 having a tooth portion 12g meshing with the worm Mg of the motor output shaft Ms is rotatably supported with respect to the housing case 11 via the pivot shaft 12s. A pin-shaped first protrusion 12p is integrally provided at a position spaced by a predetermined amount from the center (the center of the pivot shaft 12s), and the swing gear 13 is engaged with the first protrusion 12p. The point having the engaging portion 13k1 and the point that the pinion gear 14 is rotatably supported by the housing case 11 via the gear shaft 14s are the same as in the first embodiment.

  As shown in FIG. 5, the first protrusion 12p of the worm wheel 12 is rotated in the direction of the arrow A1 by the rotation of the motor output shaft Ms from the state where the wiper arm W is in the left inclined position inclined leftward from the neutral position. As a result, the rack tooth portion 13g of the swing gear 13 moves in the direction of the arrow A2. At this time, the second engaging portion 13k2 of the swing gear 13 and the second protrusion 11p of the housing case 11 are engaged with each other while being guided, whereby the swing gear 13 swings along a predetermined locus. Perform dynamic movement.

  Then, the rotation of the motor output shaft Ms causes the first protrusion 12p of the worm wheel 12 to continue to rotate in the direction of the arrow A1, so that the swing gear 13 moves in the direction of the arrow A2, and the wiper arm W moves to the neutral position shown in FIG. Through the position (first neutral position), it reaches the right inclined position inclined rightward as shown in FIG. Further, the rotation of the motor output shaft Ms causes the worm wheel 12 to continue to rotate in the direction of the arrow A1, whereby the wiper arm W reverses and passes through the neutral position (second neutral position) shown in FIG. Return to the right-tilted position. While the motor output shaft Ms continues to rotate, the rotation operation of the motor output shaft Ms is converted into the reciprocating rotation operation of the pinion gear 14, and the series of operations shown in FIGS. 5 to 8 are repeated. Yes.

Next, a third embodiment of the present invention will be described.
FIGS. 9-12 is explanatory drawing which shows roughly the structure and series of operation | movement of the drive device of the wiper apparatus for vehicles which concern on 3rd Embodiment of this invention.
As shown in these drawings, in this third embodiment, the reciprocating member 23 that reciprocates by the rotation of the worm wheel 22 has a rack tooth portion 23g that meshes with the pinion gear 24 and extends substantially linearly. 23H and an engagement main body 23J having a first engagement portion 23k that engages with the first protrusion 22p of the worm wheel 22 and extending substantially linearly, and these gear main body 23H and the engagement main body The portion 23J is connected so as to intersect at a substantially right angle.

Specifically, the left end in the figure of the gear main body 23H and the upper end of the engagement main body 23J are connected so as to intersect at a substantially right angle, and the gear main body 23H and the engagement main body 23J are viewed from the front. A substantially L-shape is formed.
The first engagement portion 23k of the engagement main body portion 23J is formed in a groove shape, and the first protrusion 22p of the worm wheel 22 is slidably guided by the groove-shaped first engagement portion 23k. It is formed in a pin shape.

The gear body 23H of the reciprocating member 23 is integrally provided with a pair of pin-shaped protrusions 23p (second protrusions) that protrude toward the back side in the drawing, and the housing case 21 includes these second protrusions. An engaging portion 21k (second engaging portion) that engages with the protrusion 23p is provided. Specifically, the second engagement portion 21k is configured as a concave linear guide groove portion that slidably guides the pair of pin-shaped second protrusions 23p.
When the worm wheel 22 rotates, the second protrusion 23p and the second engaging portion 21k engage with each other while guiding each other, so that the reciprocating member 23 is linearly connected to the second engaging portion 21k. A reciprocating motion is performed along the trajectory.

  A worm wheel 22 having a tooth portion 22g that meshes with the worm Mg of the motor output shaft Ms is rotatably supported with respect to the housing case 21 via the pivot shaft 22s. A pin-shaped first protrusion 22p is integrally provided at a position spaced by a predetermined amount from the center (the center of the pivot shaft 22s), and the reciprocating member 23 is engaged with the first protrusion 22p. The point which has the engaging part 23k, the point with which the pinion gear 24 is rotatably supported with respect to the housing case 21 via the gear shaft 24s, etc. are the same as that of the above-mentioned embodiment.

  As shown in FIG. 9, the first protrusion 22p of the worm wheel 22 is rotated in the direction of the arrow A1 by the rotation of the motor output shaft Ms from the state where the wiper arm W is in the left inclined position inclined leftward from the neutral position. As a result, the rack tooth portion 23g of the reciprocating member 23 moves. At this time, since the second protrusion 23p of the reciprocating member 23 and the second engaging portion 21k of the housing case 21 are engaged with each other while being guided, the reciprocating member 23 is in contact with the second engaging portion 21k. Performs reciprocation along a linear trajectory.

  Then, by the rotation of the motor output shaft Ms, the first protrusion 22p of the worm wheel 22 continues to rotate in the direction of the arrow A1, so that the reciprocating member 23 moves along the linear locus of the second engagement portion 21k, and the wiper arm W passes through the neutral position (first neutral position) shown in FIG. 10 and reaches the right inclined position inclined rightward as shown in FIG. Further, the rotation of the motor output shaft Ms causes the worm wheel 22 to continue to rotate in the direction of the arrow A1, so that the wiper arm W reverses and passes through the neutral position (second neutral position) shown in FIG. Return to the right-tilted position. While the motor output shaft Ms continues to rotate, the rotation operation of the motor output shaft Ms is converted into the reciprocating rotation operation of the pinion gear 24, and the series of operations shown in FIGS. 9 to 12 are repeated. Yes.

  According to the present embodiment, the same operational effects as those of the above-described embodiments can be obtained, and the reciprocating member 23 includes the gear body portion 23H having the rack tooth portion 23g and extending substantially linearly, and the first engagement. An engaging main body portion 23J having a joint portion 23k and extending substantially linearly, and connecting the gear main body portion 23H and the engaging main body portion 23J so as to cross at a substantially right angle; And the first protrusion 22p is formed in a pin shape so as to be slidably guided by the groove-shaped first engaging portion 23k. It can be performed smoothly and with low noise.

Next, a fourth embodiment of the present invention will be described.
In the third embodiment described above, the gear main body portion 23H and the engagement main body portion 23J of the reciprocating member 23 are configured to form a substantially L shape in front view. Is configured such that the gear main body and the engagement main body form a substantially T-shape in front view.
In the description of the fourth embodiment, the same components as those in the third embodiment having the same functions are denoted by the same reference numerals, and further description thereof is omitted.

FIGS. 13-16 is explanatory drawing which shows roughly the structure and series of operation | movement of the drive device of the wiper apparatus for vehicles which concern on 4th Embodiment of this invention.
As shown in these drawings, in the present embodiment, the gear main body portion 33H and the engagement main body portion 33J of the reciprocating member 33 are configured to form a substantially T-shape when viewed from the front, The two protrusions 33p are provided in the vicinity of both end portions of the gear main body portion 33H. Accordingly, the first engaging portion 33k extends substantially at right angles to the rack tooth portion 33g at the approximate center of the rack tooth portion 33g.

Further, the pinion gear 24 is located above the approximate center of the second engaging portion 31 k of the housing case 31. As in the third embodiment, the second engagement portion 31k is specifically a concave linear guide groove that guides the pair of pin-shaped second protrusions 33p in a slidable manner. It is configured.
Then, while the motor output shaft Ms continues to rotate, the rotation operation of the motor output shaft Ms is converted into the reciprocating rotation operation of the pinion gear 24, and the series of operations of FIGS. 13 to 16 are repeated.

  According to this embodiment, the balance between the reciprocating members is improved by configuring the gear main body 33H and the engaging main body 33J of the reciprocating member 33 so as to form a substantially T shape in front view. Smooth reciprocating motion can be obtained. Further, the layout around the pinion gear 24 is improved, and the degree of design freedom can be increased.

  In the third and fourth embodiments, the pair of pin-like second protrusions 23p and 33p projecting to the back side in each figure are integrally formed on the gear main body portions 23H and 33H of the reciprocating members 23 and 33. The housing cases 21 and 31 are provided with second engaging portions 21k and 31k that engage with the second protrusions 23p and 33p. The second engaging portions 21k and 31k are concretely provided. Is configured as a concave linear guide groove that slidably guides the pair of pin-shaped second protrusions 23p and 33p. Instead, the housing case is provided with a second protrusion to reciprocate. You may make it provide a 2nd engaging part in the gear main-body part of an action | operation member.

FIG. 17 is a front explanatory view schematically showing the structure of a drive device according to a modification of the fourth embodiment. In this modification, a rail-shaped second protrusion 31r is integrally provided on the housing case 31, while the rail-shaped second protrusion 31r is slidable on the gear body 33H of the reciprocating member 33. A second engaging portion 33m having a guide groove shape is provided.
When the worm wheel 22 rotates, the second projecting body 31r and the second engaging portion 33m engage with each other while guiding each other, whereby the reciprocating member 33 is engaged with the second projecting body 31r and the second projecting body 31r. A reciprocating motion is performed along a linear locus of the engaging portion 33m.

  The present invention is not limited to the above-described embodiment, and it goes without saying that various modifications and improvements can be made without departing from the scope of the invention.

  The present invention relates to a motion conversion mechanism that converts a rotation operation of a motor output shaft into a reciprocating operation of a predetermined component, and a vehicle wiper device that includes such a motion conversion mechanism. By making it possible to maintain the meshing state of the swing gear and the pinion gear without necessity, the structure of the motion conversion mechanism can be simplified. For example, a wiper device of an automobile such as a normal passenger car, and such a wiper device can be incorporated. It can be effectively used as a motion conversion mechanism.

It is a part of explanatory drawing which shows roughly the structure and series of operation | movement of a drive device of the wiper apparatus for vehicles which concern on 1st Embodiment of this invention. It is a part of explanatory drawing which shows roughly the structure and series of operation | movement of the drive device of 1st Embodiment. It is a part of explanatory drawing which shows roughly the structure and series of operation | movement of the drive device of 1st Embodiment. It is a part of explanatory drawing which shows roughly the structure and series of operation | movement of the drive device of 1st Embodiment. It is a part of explanatory drawing which shows roughly the structure and series of operation | movement of the drive device of the wiper apparatus for vehicles which concern on 2nd Embodiment of this invention. It is a part of explanatory drawing which shows roughly the structure and series of operation | movement of the drive device of 2nd Embodiment. It is a part of explanatory drawing which shows roughly the structure and series of operation | movement of the drive device of 2nd Embodiment. It is a part of explanatory drawing which shows roughly the structure and series of operation | movement of the drive device of 2nd Embodiment. It is a part of explanatory drawing which shows roughly the structure and series of operation | movement of a drive device of the wiper apparatus for vehicles which concern on 3rd Embodiment of this invention. It is a part of explanatory drawing which shows roughly the structure and series of operation | movement of a drive device of 3rd Embodiment. It is a part of explanatory drawing which shows roughly the structure and series of operation | movement of a drive device of 3rd Embodiment. It is a part of explanatory drawing which shows roughly the structure and series of operation | movement of a drive device of 3rd Embodiment. It is a part of explanatory drawing which shows roughly the structure and series of operation | movement of a drive device of the wiper apparatus for vehicles which concern on 4th Embodiment of this invention. It is a part of explanatory drawing which shows roughly the structure and series of operation | movement of a drive device of 4th Embodiment. It is a part of explanatory drawing which shows roughly the structure and series of operation | movement of a drive device of 4th Embodiment. It is a part of explanatory drawing which shows roughly the structure and series of operation | movement of a drive device of 4th Embodiment. It is explanatory drawing which shows roughly the structure of the drive device which concerns on the modification of the said 4th Embodiment.

Explanation of symbols

1, 11, 21, 31 Housing case 1k, 13k2, 21k, 31k, 33m Second engaging portion 2, 12, 22 Worm wheel 2g, 12g, 22g (Worm wheel) tooth portion 2p, 12p, 22p (Worm wheel) First projection body 3,13 swing gear 3g, 13g rack tooth portion 3k, 13k (swing gear) first engagement portion 3p, 11p, 23p, 33p, 31r second projection Body 4, 14, 24 Pinion gear 23, 33 Reciprocating member 23H, 33H (Reciprocating member) Gear body 23J, 33J (Reciprocating member) Engaging body M Electric motor Mg (Motor output shaft) Worm Ms Motor output shaft W Wiper arm

Claims (4)

A motion conversion mechanism that converts the rotation operation of the motor output shaft into a reciprocating operation of a predetermined component,
A worm formed on the outer periphery of the motor output shaft;
A worm wheel that is rotatably supported with respect to the housing case, has a tooth portion that meshes with the worm, and is provided with a first protrusion at a predetermined distance from the rotation center;
A reciprocating member having a first engaging portion that engages with the first protrusion, and reciprocating by rotation of the worm wheel;
A pinion gear that meshes with a rack tooth portion provided on the reciprocating member and performs a reciprocating rotation operation,
A second protrusion is provided on one of the housing case and the reciprocating member, and a second engagement portion that engages with the second protrusion is provided on the other, and the second protrusion And the second engaging portion engage with each other while guiding each other, thereby causing the reciprocating member to reciprocate.
A motion conversion mechanism characterized by that. The reciprocating member includes a gear body portion having the rack tooth portion and extending substantially linearly, and an engagement body portion having the first engagement portion and extending substantially linearly,
The gear main body portion and the engagement main body portion are connected so as to intersect at a substantially right angle,
The first engaging portion is formed in a groove shape, and the first protrusion is formed in a pin shape that is slidably guided by the groove-shaped first engaging portion.
The motion conversion mechanism according to claim 1.   The motion conversion mechanism according to claim 2, wherein the engagement main body portion and the gear main body portion are substantially T-shaped. A vehicle wiper device comprising: a wiping member for wiping a window glass of a vehicle; a wiper arm for supporting the wiping member; and a drive device having a motor for driving the wiper arm,
The said drive device is provided with the motion conversion mechanism as described in any one of Claims 1-3, The said pinion gearwheel is couple | bonded with the said wiper arm, The wiper apparatus for vehicles characterized by the above-mentioned.

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