JP5559106B2 - Window regulator - Google Patents

Description

  The present invention relates to a window regulator for raising and lowering a window glass of an automobile.

  A conventional window regulator comprising a drive gear attached to a drive motor, a push-pull member that meshes with the drive gear and moves up and down by bi-directional rotation of the drive gear, and a frame that fixes and supports the drive motor The thing of patent document 1 is mentioned as an example.

  The technology of Patent Document 1 relates to the structure of the push-pull strip itself, and this document describes that the push-pull strip is configured by connecting and fixing a reinforcing chain to a flexible long body. Has been.

JP 59-52078 A

  When the push-pull strip is formed of a rack belt, it is important to smoothly engage the drive gear and the rack belt without engaging the rack belt.

  An object of the present invention is to stably mesh a drive gear and a rack belt with a simple structure in a window regulator.

  In order to solve the above problems, the present invention includes a drive gear attached to a drive motor, an open-end rack belt that meshes with the drive gear and moves by bidirectional rotation of the drive gear to raise and lower the carrier, and the drive motor And a frame for fixing and supporting the frame, wherein the frame has an annular wall portion formed in an annular shape around an axis of the drive gear so as to surround a tooth surface of the drive gear. A part of the drive gear is exposed from the opening formed in the portion and meshes with the rack belt, and is located at least near the drive path in both end portions of the annular wall portion in the opening. With respect to the wall end portion, the interval dimension S1 between the wall end portion and the tooth surface of the drive gear is set to be smaller than the interval dimension S2 between the inner peripheral surface of the annular wall portion and the tooth surface of the drive gear. The features.

  The said annular wall part is provided so that a drive gear may be enclosed in order to improve the dustproof property with respect to a drive gear, or waterproofing. When a structure in which a part of the drive gear is exposed from the opening formed in the annular wall and meshed with the rack belt is employed, the rack belt may be caught in the gap between the wall end and the drive gear. In particular, since the window glass is subjected to a lifting load on the drive path side, forcible bending deformation of the rack belt occurs on the drive path side, and the rack belt may be caught in the gap between the wall end near the drive path and the drive gear. is there.

  To solve this problem, the distance dimension S1 between the wall end near the drive path and the tooth surface of the drive gear is set smaller than the distance dimension S2 between the inner peripheral surface of the annular wall part and the tooth surface of the drive gear. The rack belt can be prevented from being caught. If the entire spacing dimension S2 is set to be small, quality control of the spacing dimension S2 becomes difficult due to manufacturing errors of the annular wall portion, assembly errors of the drive gear, and the like. However, according to the present invention, for example, the spacing dimension S2 is set to a large dimension with a margin, and the spacing dimension S1 is set to be small only at the wall end portion, so that the quality control points can be integrated into one point. .

  In the present invention, a step surface is formed on a side portion of the rack teeth of the rack belt, and the frame is a meshing portion guide that guides the belt back surface of the rack belt at the meshing portion of the drive gear and the rack belt. It has a wall and a meshing part guide protrusion for guiding the step surface.

  According to the present invention, by being guided by the meshing portion guide wall and the meshing portion guide protrusion, the swing of the rack belt in the belt plate thickness direction is suppressed, and the meshing depth of the drive gear and the rack teeth is kept constant. Is done.

  Further, the present invention is characterized in that a circular concave bearing portion that rotatably supports the tip of the output shaft of the drive motor is formed on the frame.

  According to the present invention, the output shaft of the drive motor is pivotally supported by the bearing portion, so that the meshing depth between the drive gear and the rack teeth is kept more constant.

  Further, the present invention is characterized in that the bearing portion is formed as an annular wall portion protruding toward the drive motor, and the outer peripheral surface of the bearing portion guides the positioning of the inner peripheral surface of the drive gear.

  According to the present invention, for example, when the drive gear is configured to be mounted so as not to rotate relative to the output shaft of the drive motor and to be slidable in the axial direction by spline coupling or the like, the drive gear is By adopting a structure that guides the positioning of the inner peripheral surface, the relative positions of the drive gear, drive motor, and rack belt can be accurately and easily determined by the frame, and the engagement between the drive gear and the rack teeth is accurate. Can be managed well.

  According to the present invention, the drive gear and the rack belt can be stably meshed with a simple structure.

It is an external appearance perspective view which shows the form which applied the window regulator which concerns on this invention to the side door of a motor vehicle. It is a schematic side view which shows the drive path | route and idle path | route of a push pull strip. 1 is an external perspective view of a window regulator according to the present invention. It is a disassembled perspective view of the A section in FIG. It is a disassembled perspective view of the B section in FIG. It is CC sectional drawing in FIG. It is DD sectional drawing in FIG. 8A is a cross-sectional view taken along line EE in FIG. 3, and FIG. 8B is a cross-sectional view taken along line FF in FIG. 8A. It is GG sectional drawing in FIG. It is HH sectional drawing in FIG. 11A is a cross-sectional view taken along the line II in FIG. 3, and FIG. 11B is a cross-sectional view taken along the line JJ in FIG. Fig.12 (a) is sectional drawing around the terminal end of a square pipe body, FIG.12 (b) is KK sectional drawing in Fig.12 (a). It is a sectional side view around the terminal end of a square pipe body. It is a side view of the window regulator in the state where the rack belt protrudes from the end port of the square pipe body.

  Hereinafter, the form which applied the window regulator to the side door of a car is explained. Further, in the following description, the P direction refers to the direction along the plane of the wind glass in plan view (that is, the vehicle longitudinal direction), and the Q direction refers to the direction that is substantially orthogonal to the plane of the wind glass (that is, the vehicle width direction). ).

  As shown in FIG. 1, a window regulator 1 according to the present invention for moving up and down a window glass 3 is built in a lower interior of a side door 2 of an automobile. As shown in FIG. 3, the window regulator 1 includes a drive motor 4, a drive gear 5 (FIG. 11) attached to the output shaft of the drive motor 4, and a bidirectional rotation of the drive gear 5 meshed with the drive gear 5. A flexible push-pull strip 6 having one end and the other end pushed and pulled by the carrier, a carrier 7 coupled to one end of the push-pull strip 6 and coupled to the wind glass 3, and a drive The guide rail 8 for guiding the push-pull strip 6 and the carrier 7 in the path R1, the fixed support means for the drive motor 4, the fixed support means for the guide rail 8, and the curved track of the push-pull strip 6 in the idle path R2 are guided. The main component is the curved track guide means and the frame 9 integrally formed with the attachment means to the attachment object (side door 2).

  In FIG. 2, the drive path R <b> 1 is a path that converts and transmits the rotational force of the drive gear 5 into a substantially linear moving force of the carrier 7. It is a movement path | route of the push-pull strip 6 to an attachment part. The idle route R2 is a route for retracting the extra length of the push-pull strip 6 when the carrier 7 is lowered. As viewed from the Q direction, the drive path R1 is formed in a straight line, and at least a part of the idle path R2 is formed in a curved shape.

"Push-pull strip 6"
The push-pull strip 6 will be described with reference to FIGS. 4 and 9. The push-pull strip 6 includes a rack belt 10 having a rack tooth surface 10D, a first belt side surface 10E, a second belt side surface 10F, and a belt back surface 10G that constitute an upper surface of the rack tooth 10A. Therefore, the drive gear 5 (FIG. 11) that meshes with the rack belt 10 is a pinion gear. As can be seen from FIG. 9, the rack teeth 10A are formed to have a width dimension smaller than the entire width of the rack belt 10, thereby forming stepped surfaces 10H on both sides of the rack teeth 10A. In addition, a rectangular groove 10I is formed at the center in the width direction on the belt back surface 10G along the extending direction of the belt.

As shown in FIG. 4 and FIG. 8B, the rack tooth surface 10D side at one end of the rack belt 10 is not formed with the rack teeth 10A. A pair of upper and lower engagement holes 10B are formed. The engagement hole 10B faces the groove bottom of the rectangular groove 10I.
The rack belt 10 described above is made of, for example, a synthetic resin, and is drawn so that the rack tooth surface 10D faces the inside of the curved track of the idle path R2.

"Carrier 7"
Referring mainly to FIGS. 4 and 7, the carrier 7 is formed as a plate surface along the P direction and is connected to the lower portion of the window glass 3 (FIG. 1), on one surface of the glass connecting portion 7 </ b> A. A belt connecting portion 7B that protrudes and is connected to one end of the rack belt 10; The glass connecting portion 7A has a horizontally long and substantially rectangular shape when viewed from the Q direction, and a mounting hole 7C for passing a fixing bolt (not shown) of the window glass 3 is drilled. Further, a slip-off prevention wall 7D of the window glass 3 is provided on the other surface of the glass connecting portion 7A.

  As shown in FIG. 7, the belt connecting portion 7 </ b> B has a base portion 7 </ b> E that is formed to rise perpendicularly from one surface of the glass connecting portion 7 </ b> A in parallel with the plate surface of the glass connecting portion 7 </ b> A from the tip of the base portion 7 </ b> E The intermediate portion 7F is extended, and the sliding portion 7G is extended in a direction away from one surface of the glass connecting portion 7A from the tip of the intermediate portion 7F, and has a crank shape. A pair of rectangular parallelepiped engaging projections 7H are provided on one surface side of the sliding portion 7G, and further on the other surface side of the sliding portion 7G, which is directly behind the projecting position of each engaging projection 7H, in the vertical direction. A projecting protrusion 7I (FIG. 8B) having an arc shape protrudes.

  The belt connecting portion 7B is connected to the rack belt 10 by the sliding portion 7G being superimposed on the belt thin-walled portion 10C, and the engaging protrusions 7H engaging the respective engaging holes 10B. The periphery of the tip of the engaging protrusion 7H is accommodated in the rectangular groove 10I. As a result, the engaging portion 42 between the rack belt 10 and the carrier 7 is laid out inside the guide rail 8, and the engaging portion 42 does not come out of the guide rail 8 unless the window regulator 1 is disassembled. It has become.

"Guide rail 8"
The guide rail 8 will be described with reference to FIGS. 4 and 6 to 9. The guide rail 8 is a long member having a constant cross section extending in a substantially vertical shape, and the shape seen from the P direction exhibits a gentle curve that matches the curved surface shape of the window glass 3, while seen from the Q direction. The shape is straight. As shown in FIG. 9, the guide rail 8 has a flat cross-sectional shape and guides four surfaces of the rack belt 10 (rack tooth surface 10D, first belt side surface 10E, second belt side surface 10F, belt back surface 10G). It has a long rectangular frame in the direction. The rectangular frame portion includes a first frame surface 8A facing the rack tooth surface 10D, a second frame surface 8B facing the belt back surface 10G, a third frame surface 8C facing the first belt side surface 10E, and a second frame surface 8E. The inner space surrounded by the rectangular frame portion constitutes a guide groove of the rack belt 10. The fourth frame surface 8D faces the belt side surface 10F. That is, the engaging portion 42 between the rack belt 10 and the carrier 7 shown in FIG. 7 is laid out in the guide groove of the rack belt 10 in the guide rail 8. The third frame surface 8 </ b> C is a surface facing one surface of the glass connecting portion 7 </ b> A of the carrier 7. An opening 8E for passing the belt connecting portion 7B (intermediate portion 7F) of the carrier 7 is formed in a part of the second frame surface 8B near the third frame surface 8C, and a fourth of the opening 8E is formed. A first flange surface 8F is projected from the edge near the frame surface 8D along the P direction. In addition, the second flange surface 8G protrudes in the opposite direction to the first flange surface 8F in a manner extending substantially from the third frame surface 8C.

  The guide rail 8 is, for example, a sheet metal processed molded product, and is in the order of the first flange surface 8F to the second frame surface 8B, the fourth frame surface 8D, the first frame surface 8A, the third frame surface 8C, and the second flange surface 8G. It consists of an integrally molded product that is bent. The second flange surface 8G is formed by folding the third frame surface 8C. Of course, you may comprise the guide rail 8 from an extrusion molded product.

  As shown in FIG. 4, a fixing bracket 11 for fixing to the side door 2 is attached to the fourth frame surface 8 </ b> D at the upper end of the guide rail 8 by welding or the like. The fixed bracket 11 is formed as a plate surface substantially along the P direction. A nut 12 for screwing a bolt (not shown) for fastening to the side door 2 is attached to the fixing bracket 11.

"Frame 9"
The frame 9 will be described with reference to FIGS. 5 and 9 to 11. The frame 9 includes a motor fixing portion 13 that fixes and supports the drive motor 4, a guide rail fixing portion 14 that fixes and supports the lower end of the guide rail 8, and a curved track that guides the curved track of the rack belt 10 in the idle path R2. And a guide portion 15. The frame 9 is made of, for example, a resin molded product in which the motor fixing portion 13, the guide rail fixing portion 14, and the curved track guide portion 15 are integrally formed.

“Motor fixing portion 13 (fixing support means of the drive motor 4)”
As shown in FIGS. 5 and 11A, the motor fixing portion 13 is formed as a plate-like portion substantially along a plane orthogonal to the Q direction, although it has a plurality of irregularities in the Q direction. The motor fixing portion 13 is formed with a plurality of motor mounting holes 16 and a circular concave bearing portion 17 that rotatably supports the tip of the output shaft 4A of the drive motor 4. The motor fixing unit 13 constitutes a fixing support unit for the drive motor 4. The drive motor 4 is fastened and fixed to the motor fixing portion 13 by a bolt 18 that passes through the motor mounting hole 16 with the end of the output shaft 4A being pivotally supported by the bearing portion 17. Since the tip of the output shaft 4A is pivotally supported by the bearing portion 17, the tilt of the drive gear 5 attached to the output shaft 4A is prevented, and the drive gear 5 and the rack teeth 10A of the rack belt 10 are connected. Engage accurately.

  Specifically, the bearing portion 17 is formed as an annular wall portion protruding toward the drive motor 4. The tip of the output shaft 4A is formed as a small diameter portion 4B, and the inner peripheral surface 17A of the bearing portion 17 pivotally supports the small diameter portion 4B. Further, in the present embodiment, the drive gear 5 is mounted so as not to rotate relative to the output shaft 4A and to be slidable in the axial direction by spline coupling or the like. A protruding portion 5A is formed on the inner peripheral side of the drive gear 5, and the protruding portion 5A is located between the annular step surface 4C of the output shaft 4A and the inclined surface 17C formed around the bearing portion 17. Thus, the axial movement of the drive gear 5 with respect to the output shaft 4A is prevented. And the outer peripheral surface 17B of the bearing part 17 bears the radial positioning function of the drive gear 5 by guiding the inner peripheral surface 5B of the projecting part 5A. In FIG. 11A, the clearance between the inner peripheral surface 17A of the bearing portion 17 and the outer peripheral surface of the small-diameter portion 4B, and the clearance between the outer peripheral surface 17B of the bearing portion 17 and the inner peripheral surface 5B of the drive gear 5. Is exaggerated, but in reality it is negligible.

  When the drive motor 4 is fixed to the motor fixing portion 13, the space around the drive gear 5 is fixed to the housing of the drive motor 4 and the motor as shown in FIG. A sealed space 19 is formed by the molding surface of the portion 13. Further, in the sealed space 19, the drive gear 5 is laid out in a gear storage space 31 formed in the motor fixing portion 13 for the purpose of further improving the dust resistance and waterproofness with respect to the drive gear 5. The gear storage space 31 is formed along a plane orthogonal to the Q direction, and has a substantially disc-shaped substrate portion 31A having a diameter larger than the outer diameter of the drive gear 5, and the Q toward the drive motor 4 from the substrate portion 31A. And an annular wall portion 31B formed in an annular shape with a constant diameter around the axis of the drive gear 5 so as to rise along the direction and surround the tooth surface of the drive gear 5 made of a spur gear. The above-described bearing portion 17 is formed at the center of the substrate portion 31A.

  As shown in FIG. 11B, a part of the annular wall portion 31 </ b> B is formed as an opening, and a part of the drive gear 5 is exposed from the opened part to mesh with the rack belt 10. Of the two wall end portions (32A, 32B) of the opening portion of the annular wall portion 31B, at least the wall end portion 32A located near the drive path R1 is formed so as to be located near the axis of the drive gear 5. Has been. That is, only the wall end portion 32 </ b> A protrudes toward the axial center of the drive gear 5 with respect to the annular wall portion 31 </ b> B having a constant diameter centered on the axial center of the drive gear 5. Therefore, the distance dimension S1 between the wall end portion 32A and the tooth surface of the drive gear 5 is set smaller than the distance dimension S2 between the inner peripheral surface of the annular wall portion 31B and the tooth surface of the drive gear 5. In some cases, the wall end 32B near the idle path R2 is also positioned closer to the axial center of the drive gear 5, and the distance between the wall end 32B and the tooth surface of the drive gear 5 is smaller than the distance S2. It may be set.

  The reason why the interval dimension S1 is set smaller than the interval dimension S2 in the wall end portion 32A located near the drive path R1 is that if the interval dimension S1 is set to be the same as the interval dimension S2, the rack belt 10 and the wall end portion 32A This is because there is a risk of being caught in a gap with the drive gear 5. Since a large load is not applied to the rack belt 10 positioned on the idle path R2 side with respect to the meshing portion 41, there is almost no possibility that the rack belt 10 is forcedly deformed. Therefore, the rack belt 10 has a wall end near the idle path R2. There is no possibility of getting caught in the gap between the portion 32B and the drive gear 5. However, on the drive path R1 side, the window glass 3 is subjected to a lifting load, so that there is a risk that the rack belt 10 may bend and deformed. As a result, the rack belt 10 is connected to the wall end 32A, the drive gear 5, and the like. There is a risk of getting caught in the gap.

  To solve this problem, for example, a method is conceived in which the inner circumferential surface of the annular wall portion 31B is set to a constant diameter from the wall end portion 32A to the wall end portion 32B, and the interval dimension S2 is set small. However, in this method, since a small space dimension S2 is set between the inner peripheral surface of the annular wall portion 31B over almost the entire circumference of the drive gear 5, a manufacturing error of the gear housing space 31 and an assembly error of the drive gear 5 are taken into consideration. In addition, quality control of the spacing dimension S2 becomes difficult. On the other hand, the spacing dimension S2 is set to a large dimension with a margin, and the spacing dimension S1 is set to be smaller than the spacing dimension S2 only at the wall end portion 32A (also the wall end portion 32B in some cases). The management points can be integrated into one point (the wall end portion 32B is also two points when the interval dimension S1 is reduced).

  Next, in the meshing portion 41 between the drive gear 5 and the rack belt 10, the belt back surface 10G of the rack belt 10 is guided by the meshing portion guide wall 33 formed linearly along the vertical direction in the motor fixing portion 13. The Then, as shown in FIG. 11A, a meshing portion guide projection 34 projects from the board portion 31A in parallel with the meshing portion guide wall 33. For example, as shown in FIG. 11B, the engagement portion guide protrusion 34 is formed from the vicinity of the end portion 32A to the vicinity of the end portion 32B, and as shown in FIG. 11A, the planar guide surface 34A is formed. Thus, the step surface 10H of the rack belt 10 is guided. As a result, the rack belt 10 is guided by the meshing portion guide wall 33 and the meshing portion guide protrusion 34 to suppress the vibration in the belt thickness direction, and the meshing depth of the drive gear 5 and the rack teeth 10A is kept constant. Will be.

"Guide rail fixing part 14 (fixing support means for guide rail 8)"
The guide rail fixing part 14 shown in FIG. 5 is a part located at the upper part of the motor fixing part 13 and is formed as an opening part 20 penetrating vertically for inserting and fixing the lower end of the guide rail 8 as shown in FIG. ing. The lower end of the opening 20 faces the sealed space 19 (FIG. 11A). A plurality of fixing ribs 21 project from the inner wall constituting the opening 20 along the vertical direction, and the lower end of the guide rail 8 is fixed to the guide rail fixing portion 14 by being pressed from the fixing rib 21. The Specifically, the lower end of the guide rail 8 is positioned in the P direction with respect to the frame 9 by being pressed from the fixing rib 21 at two locations of the first frame surface 8A and at one location of the second frame surface 8B. The first flange surface 8F and the second flange surface 8G are pressed against each other in a manner of being sandwiched between the pair of fixing ribs 21, thereby positioning the frame 9 in the Q direction.

  A stopper fixing portion 22 shown in FIGS. 5 and 9 is formed above the opening 20 in the frame 9. A stopper 23 is attached to the stopper fixing portion 22 so as to be inserted from above. The stopper 23 is made of, for example, a rubber molded product. The stopper 23 abuts on the carrier 7 and restricts the downward movement of the carrier 7. The stopper 23 has a dustproof function and a waterproof function for the sealed space 19 (FIG. 11A) by closing a part of the gap between the inner wall of the opening 20 and the guide rail 8 from above.

“Curved track guide part 15 (curved track guide means for guiding the curved track of the push-pull strip 6 in the idle path R2)”
In FIG. 5, the curved track guide portion 15 guides the rack tooth surface 10D, the first belt side surface 10E, the second belt side surface 10F, and the belt back surface 10G of the rack belt 10 (see FIG. 9) inserted therein. It consists of a square pipe body 24 having a rectangular cross-sectional shape that is long in the Q direction and has a guide inner peripheral wall 24A, a first guide side wall 24B, a second guide side wall 24C, and a guide outer peripheral wall 24D. The square pipe body 24 has a distal end facing the sealed space 19 (FIG. 11A), and a lower end of the motor fixing portion 13 has its end port 25 facing upward and toward the drive path R1 from the vertical direction. Up to a position, a curve is formed in a convex shape downward with a substantially constant radius of curvature. The end port 25 is located above the meshing portion 41 between the drive gear 5 and the rack belt 10. In the first guide side wall 24B and the second guide side wall 24C, substantially rectangular hollow holes 26 for weight reduction and the like are formed at appropriate intervals in the extending direction. The square pipe body 24 is connected to the motor fixing portion 13 by the connecting portion 27. When the window glass 3 (FIG. 1) is opened by a predetermined amount, that is, when the carrier 7 is lowered from a predetermined position, the other end side of the rack belt 10 protrudes from the end port 25.

  As shown in FIG. 12, a protrusion 35 that presses the first belt side surface 10 </ b> E is formed on the inner side of the first guide side wall 24 </ b> B before the end port 25. As shown in FIG. 12A, the protrusion 35 is formed to have a gentle arc shape over the extending direction of the square pipe body 24, and the maximum protrusion dimension L from the inner surface of the first guide side wall 24B is For example, it is about 1 mm. When the rack belt 10 protrudes from the end opening 25, the rack belt 10 is pressed by the protrusion 35 formed in front of the end opening 25, thereby suppressing the movement of the protruding portion in the belt width direction, that is, the movement in the Q direction. .

Here, if the second belt side surface 10F is pressed against the second guide side wall 24C by pressing the first belt side surface 10E against the protrusion 35, there is a problem that the sliding resistance of the rack belt 10 increases. On the other hand, as shown in FIG. 12 (a), if, for example, the lightening through hole 26 is formed in the second guide side wall 24C facing the projection body 35 over the end opening 25, the projection body 35 is pressed. The rack belt 10 is displaced so as to escape into the lightening through hole 26. Therefore, the second belt side surface 10F is not pressed against the second guide side wall 24C, and the sliding resistance of the rack belt 10 does not increase. The rack belt 10 is elastically deformed by being pressed by the protrusions 35, and the first belt side surface 10E is pressed against the protrusions 35 by the restoring force, so that even if the second belt side surface 10F is pressed against the second guide side wall 24C. Even if not, the effect of suppressing the swing of the rack belt 10 in the width direction is exhibited.
Of course, the protrusion 35 is provided on the second guide side wall 24C side, or the protrusion 35 is provided on the second guide side wall 24C side, and the first guide side wall 24B facing the protrusion 35 is provided in the width direction of the rack belt 10. However, the opening may be formed over the end opening 25 so as to release the displacement.

  Further, as shown in FIG. 13, the guide inner peripheral wall 24 </ b> A and the guide outer peripheral wall 24 </ b> D are both formed in a widened manner around the end opening 25. For the purpose of guiding the rack belt 10 just before the end port 25 while preventing the rack teeth 10A from being caught, the guide inner peripheral wall 24A has a larger distance from the rack belt 10 at the end port 25 than the guide outer peripheral wall 24D. The distance between the starting point position of the widening and the end opening 25 is set large. That is, in FIG. 13, the distance T1 between the guide inner peripheral wall 24A and the rack belt 10 is larger than the distance T2 between the guide outer peripheral wall 24D and the rack belt 10, and the opening start point position 36A and end of the guide inner peripheral wall 24A The distance U1 from the end opening 25 is set to be larger than the distance U2 between the opening start point position 36B and the end opening 25 in the guide outer peripheral wall 24D.

"Attachment hole 28 (attachment means to attachment object)"
In FIG. 5, a plurality of attachment holes 28 are formed around the motor fixing portion 13 of the frame 9 as attachment means to the attachment object (side door 2). The window regulator 1 is fastened and fixed to the side door 2 (FIG. 1) by bolts through the mounting holes 28 of the frame 9 at the lower part, and the side through the fixing bracket 11 (FIG. 4) as described above at the upper part. The door 2 is fastened and fixed by bolts.

"Action"
When the drive motor 4 is driven, the rack belt 10 that meshes with the drive gear 5 moves in a straight line when viewed on the drive path R1 from the Q direction, and the rack belt 10 has an upper end via an engagement protrusion 7H and an engagement hole 10B. The engaged carrier 7 is guided by the guide rail 8 and moves up and down, and the window glass 3 moves up and down. The carrier 7 has the back surface of the belt thin portion 10C of the rack belt 10 in contact with the second frame surface 8B, and the elastic projecting portion 7I protruding from the sliding portion 7G contacts the first frame surface 8A. Positioning in the P direction with respect to the guide rail 8 is performed, and the third frame surface 8C and the second flange surface 8G are sandwiched between the intermediate portion 7F of the belt connecting portion 7B and one surface of the glass connecting portion 7A, whereby the Q with respect to the guide rail 8 is determined. After the direction is positioned, the guide rail 8 is slid. The first flange surface 8F prevents the carrier 7 from falling.

  As shown in FIG. 9, the rack belt 10 moving in the guide rail 8 is laid out so that the rack tooth surface 10D faces the first frame surface 8A side where the opening 8E is not formed. Even if dust or moisture enters the guide rail 8 from the opening 8E, the entry of dust or moisture to the rack tooth 10A side is reduced, so that the meshing of the meshing portion 41 is prevented.

  Further, as shown in FIG. 11B, in the meshing portion 41, the interval dimension S1 between the wall end portion 32A and the tooth surface of the drive gear 5 is such that the inner peripheral surface of the annular wall portion 31B and the tooth surface of the drive gear 5. Therefore, the rack belt 10 is not likely to be caught in the gap between the wall end portion 32 </ b> A and the drive gear 5. Further, the rack belt 10 is guided by the meshing portion guide wall 33 and the meshing portion guide protrusion 34, so that the vibration in the belt plate thickness direction is suppressed, and the meshing depth of the drive gear 5 and the rack teeth 10A is constant. Retained.

  Further, if the drive gear 5 is fixed to the output shaft 4A of the drive motor 4 in advance and attached to the frame 9, the rack gear 10A and the drive gear 5 can be brought into contact with each other with respect to the drive motor 4. It is necessary to strictly manage the mounting accuracy of the drive gear 5. On the other hand, when the drive gear 5 is structured such that the drive gear 5 is mounted so as not to rotate relative to the output shaft 4A and to be slidable in the axial direction by spline coupling or the like, the output shaft of the drive motor 4 is 4A is pivotally supported by the bearing portion 17, and the inner peripheral surface 5B of the drive gear 5 is positioned and guided by the outer peripheral surface 17B of the bearing portion 17, so that the three components of the drive gear 5, the drive motor 4, and the rack belt 10 are provided. The relative positions of each other can be determined accurately and easily by the frame 9, and the meshing between the drive gear 5 and the rack teeth 10A can be managed with high accuracy.

  The extra length of the rack belt 10 when the carrier 7 is lowered is retracted and stored in a manner of being folded upward by the square pipe body 24. When the carrier 7 is lowered from a predetermined position, the other end side of the rack belt 10 protrudes from the end port 25 of the square pipe body 24 toward the guide rail 8 in a substantially straight line as shown in FIG. FIG. 14 shows a state in which the rack belt 10 protrudes the maximum amount. The rack belt 10 is pressed against the protrusion 35 shown in FIG. 12 in front of the end opening 25, thereby suppressing the swing in the width direction of the protruding portion of the rack belt 10. Further, as shown in FIG. 13, the guide inner peripheral wall 24A and the guide outer peripheral wall 24D are both formed in a mouth-opening shape around the end opening 25, and the guide inner peripheral wall 24A is closer to the end opening 25 than the guide outer peripheral wall 24D. Since the distance from the rack belt 10 is large and the distance between the starting point of the widening and the end opening 25 is set large, the rack teeth 10A are prevented from being caught on the guide inner peripheral wall 24A of the end opening 25, and the rack The belt 10 is guided to just before the end port 25 by the guide outer peripheral wall 24D.

  The preferred embodiments of the present invention have been described above. The present invention is not limited to that described in the drawings, and various design changes can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Window regulator 2 Side door 3 Window glass 4 Drive motor 5 Drive gear 6 Push pull strip 7 Carrier 8 Guide rail 9 Frame 10 Rack belt (push pull strip)
10A Rack tooth 10D Rack tooth surface 10E First belt side surface 10F Second belt side surface 10G Belt back surface 10H Step surface 13 Motor fixing portion 14 Guide rail fixing portion 15 Curved track guide portion 17 Bearing portion 24 Square pipe body (curved track guide portion)
31B Annular wall portion 32A Wall end portion 32B (near the drive route) Wall end portion 33 (near the idle route) 33 Engagement portion guide wall 34 Engagement portion guide projection 41 Engagement portion R1 Drive route R2 Idle route S1 Wall end and drive Distance between gear tooth surface S2 Distance between inner peripheral surface of annular wall and tooth surface of drive gear

Claims (4)

A drive gear attached to the drive motor;
An open-end rack belt that meshes with the drive gear and moves up and down by bidirectional rotation of the drive gear; and
A frame for fixedly supporting the drive motor;
In the window regulator with
The frame has an annular wall portion formed annularly around the axis of the drive gear so as to surround the tooth surface of the drive gear,
A part of the drive gear is exposed through the opening formed in the annular wall and meshes with the rack belt;
With respect to the wall end portion located at least near the drive path in the both end portions of the annular wall portion in the opening portion, the distance dimension S1 between the wall end portion and the tooth surface of the drive gear is determined by the inner circumference of the annular wall portion. A window regulator characterized in that it is set smaller than the distance dimension S2 between the surface and the tooth surface of the drive gear. A step surface is formed on the side of the rack tooth of the rack belt,
The frame includes a meshing portion guide wall that guides a belt rear surface of the rack belt and a meshing portion guide protrusion that guides the step surface at a meshing portion between the drive gear and the rack belt. Item 2. The window regulator according to Item 1.   The window regulator according to claim 2, wherein a circular concave bearing portion that rotatably supports the tip of the output shaft of the drive motor is formed on the frame.   4. The window regulator according to claim 3, wherein the bearing portion is formed as an annular wall portion protruding toward the drive motor, and an outer peripheral surface of the bearing portion guides an inner peripheral surface of the drive gear. .

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