JP2014184771A - Wiper motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wiper motor in which assembling workability can be improved in addition to suppression of rattling of a motion conversion structure.SOLUTION: A resin spacer 50 which slide-contacts to a cover 32 is provided at a connecting plate 43, and a rubber spring 55 pressing the connecting plate 43 and the resin spacer 50 in a direction of separating both from each other is provided between the connecting plate 43 and the resin spacer 50. Thus, the resin spacer 50 and the rubber spring 55 can be arranged integrally at one side of the connecting plate 43. Therefore, the resin spacer 50 and the rubber spring 55 can be assembled integrally while suppressing rattling of a motion conversion structure 40, resulting in improving assembling workability of rear wiper motor 10.

Description

  The present invention relates to a wiper motor including a motion conversion mechanism that converts a rotational motion of a rotating body into a swing motion to swing an output shaft.

  Conventionally, a wiper motor including a motor unit and a gear unit has been used as a drive source of a wiper device mounted on a vehicle such as an automobile. The motor unit includes a rotating shaft that rotates by supplying a drive current, and the gear unit includes a reduction mechanism that reduces the rotation of the rotating shaft to increase the torque. By providing the speed reduction mechanism as described above, the vehicle-mounting property is improved by obtaining a large output while being small.

  By the way, in a drive source of a rear wiper device mounted on a rear hatch or the like of a vehicle, that is, a rear wiper motor, a motion conversion mechanism is accommodated in addition to the above-described reduction mechanism inside a gear case forming a gear portion. The motion conversion mechanism is provided between a worm wheel that forms a speed reduction mechanism and an output shaft that is rotatably supported by a gear case. The motion conversion mechanism converts the rotational motion of the worm wheel into a swing motion to swing the output shaft. In other words, in the rear wiper motor, the output shaft is configured to swing in a predetermined angular range as the rotary shaft rotates in one direction, whereby the wiper blade fixed to the output shaft reciprocates on the rear glass. Wiping operation is to be performed.

  As a rear wiper motor (wiper motor) in which a speed reduction mechanism and a motion conversion mechanism are housed in a gear case, for example, a technique described in Patent Document 1 is known. In the technique described in Patent Document 1, a speed reduction mechanism including a worm and a helical gear and a motion conversion mechanism including a swing gear and an output gear are accommodated in a gear case. An upper balance plate is disposed on the cover side of the motion conversion mechanism, and a lower balance plate is disposed on the side opposite to the cover side of the motion conversion mechanism. As a result, the motion conversion mechanism is prevented from rattling in the axial direction of the output shaft, and the wear resistance of the rear wiper motor is improved.

Japanese Patent Laying-Open No. 2005-254879 (FIG. 2)

  However, according to the wiper motor described in Patent Document 1 described above, the upper balance plate and the lower balance plate are respectively arranged on the upper side and the lower side of the motion conversion mechanism. Therefore, there is a possibility that the assembly work of the wiper motor becomes complicated.

  An object of the present invention is to provide a wiper motor capable of improving the assembly workability as well as suppressing the play of the motion conversion mechanism.

  In one aspect of the present invention, the wiper motor includes a motion conversion mechanism that converts the rotational motion of the rotating body into a swinging motion to swing the output shaft, and the motion converting mechanism has a base end side of the rotating body. A motion converting member connected to the first connecting shaft that is eccentric from the shaft center and provided with a sector gear on the distal end side, a pinion gear fixed to the output shaft and meshed with the sector gear, and a base end side of the sector gear A connecting member connected to a second connecting shaft at the shaft center and having a tip side connected to the output shaft, and the connecting member is provided with a sliding contact member that comes into sliding contact with a casing that houses the motion conversion mechanism. An elastic member that presses the connecting member and the sliding contact member in a direction to separate the connecting member and the sliding contact member is provided between the connecting member and the sliding contact member.

  In another aspect of the present invention, the wiper motor includes a motion conversion mechanism that converts the rotational motion of the rotating body into a swinging motion to swing the output shaft, and the motion converting mechanism has a base end on the rotating body. A connecting member that is connected to a first connecting shaft that is eccentric from the shaft center, a distal end side that extends toward the output shaft, a proximal end side that is fixed to the output shaft, and a distal end side that connects the second connecting shaft. A swinging member coupled to the distal end side of the coupling member via the coupling member, and the coupling member is provided with a sliding contact member that is slidably contacted with a casing that houses the motion conversion mechanism. An elastic member that presses the connecting member and the sliding contact member in a direction in which the connecting member and the sliding contact member are separated is provided between the contact member and the contact member.

  In another aspect of the present invention, an elastic member fixing portion is formed on the sliding contact member, and the elastic member is fixed to the elastic member fixing portion.

  In another aspect of the present invention, the elastic member is disposed at a central portion in the longitudinal direction of the connecting member.

  In another aspect of the invention, the elastic member is made of rubber.

  In another aspect of the present invention, a grease retaining groove is formed on the casing side of the sliding contact member.

  According to the present invention, the connecting member is provided with the sliding contact member that comes into sliding contact with the casing that houses the motion conversion mechanism, and is pressed between the connecting member and the sliding contact member in the direction in which the connecting member and the sliding contact member are separated. Since the elastic member to be provided is provided, the sliding contact member and the elastic member can be collectively arranged on one side of the connecting member. Thus, the sliding contact member and the elastic member can be assembled together while suppressing the backlash of the motion conversion mechanism, and as a result, the assembly workability of the wiper motor can be improved.

It is a top view which shows the rear wiper motor (without a cover) mounted in a vehicle. It is a partial expanded sectional view which follows the AA line of FIG. It is a perspective view which shows a connection plate. (A), (b) is a perspective view which shows a resin spacer and a rubber spring. It is a perspective view which shows the resin spacer and rubber spring which concern on Embodiment 2. FIG. It is a perspective view which shows the resin spacer and coil spring which concern on Embodiment 3. It is a perspective view which shows the resin spacer and leaf | plate spring which concern on Embodiment 4. FIG. 10 is a plan view showing a rear wiper motor (without a cover) according to a fifth embodiment. It is a partial expanded sectional view which follows the BB line of FIG.

  Hereinafter, Embodiment 1 of the present invention will be described in detail with reference to the drawings.

  1 is a plan view showing a rear wiper motor (without a cover) mounted on a vehicle, FIG. 2 is a partially enlarged sectional view taken along line AA of FIG. 1, and FIG. 3 is a perspective view showing a connecting plate. 4 (a) and 4 (b) are perspective views showing resin spacers and rubber springs, respectively.

  As shown in FIG. 1, a rear wiper motor 10 as a wiper motor is used as a drive source for a rear wiper device (not shown) mounted on a rear hatch of a vehicle, and includes a motor unit 20 and a gear unit 30. The motor unit 20 and the gear unit 30 are coupled together by a pair of fastening screws 11. The rear wiper motor 10 is configured to cause a wiper blade (not shown) provided on the rear glass to perform a reciprocating wiping operation (oscillation drive) within a predetermined angle range.

  The motor unit 20 is configured as a four-pole motor with a brush, and includes a motor case 21 that forms an outline thereof. The motor case 21 is formed into a bottomed cylindrical shape by pressing a steel plate, which is a magnetic body, and a flange portion 21a through which each fastening screw 11 is inserted is integrally provided on the opening side. Further, the motor case 21 is formed in a substantially oval cross section (details are not shown) so that the width of the motor case 21, that is, the thickness dimension in the depth direction in the figure is reduced to reduce the thickness. Yes.

  A total of four magnets 22 (only two are shown in the drawing) having a substantially arc-shaped cross section are fixed inside the motor case 21. Each magnet 22 is, for example, a ferrite magnet, and is fixed along the circumferential direction of the motor case 21 at regular intervals (intervals of 90 degrees). An armature 23 is rotatably accommodated inside each magnet 22 through a predetermined gap (air gap), and a base end side of the armature shaft 24 is fixed to the shaft center of the armature 23 so as to penetrate therethrough. ing.

  A commutator 25 is fixed to a substantially central portion along the axial direction of the armature shaft 24. An armature core 26 that forms the armature 23 is fixed to the base end side of the armature shaft 24. A coil 27 is wound around the armature core 26 with a predetermined winding method and number of turns, and the end of the coil 27 is electrically connected to the commutator 25.

  A plurality of power supply brushes 28 (only two are shown in the figure) are slidably contacted with the outer periphery of the commutator 25, and a drive current from the connector unit CU is supplied to these power supply brushes 28. It has become. As a result, a drive current is supplied to the coil 27 via the commutator 25, an electromagnetic force is generated in the coil 27, and the armature 23 (armature shaft 24) is rotationally driven.

  A worm gear 24 a (not shown in detail) is integrally provided on the distal end side of the armature shaft 24. The worm gear 24 a is disposed inside the gear case 31 and rotates inside the gear case 31. The worm gear 24 a is engaged with the gear teeth 33 a of the worm wheel 33, and the worm gear 24 a forms a speed reduction mechanism SD together with the worm wheel 33. Here, the worm wheel 33 constitutes a rotating body in the present invention.

  A radially inner side of the ball bearing BB is fixed between the commutator 25 of the armature shaft 24 and the worm gear 24a. Further, the radially outer side of the ball bearing BB is sandwiched between a bearing fitting portion BF of the gear case 31 and a stopper plate SP attached to the gear case 31. As a result, the armature shaft 24 is rotatably supported and the movement of the gear case 31 in the axial direction and the radial direction is restricted.

  As shown in FIGS. 1 and 2, the gear portion 30 includes a gear case 31 formed in a substantially bathtub shape by casting a molten aluminum material or the like. The gear case 31 includes a bottom portion 31a and a wall portion 31b, and the side opposite to the bottom portion 31a side (the front side in FIG. 1) is opened. The opening portion of the gear case 31 is closed by the cover 32. Here, the gear case 31 and the cover 32 constitute a casing in the present invention.

  A worm wheel 33 is rotatably provided inside the gear case 31, and the worm wheel 33 is formed in a substantially disk shape by injection molding a resin material such as plastic. Gear teeth 33a are integrally provided on the outer peripheral portion of the worm wheel 33, and the worm gear 24a is engaged with the gear teeth 33a.

  One end of the wheel shaft 33 b in the axial direction is fixed to the shaft center of the worm wheel 33, and the other end in the axial direction of the wheel shaft 33 b is rotatably supported on the bottom 31 a of the gear case 31.

  An output shaft 34 is rotatably supported on a portion of the gear case 31 away from the worm wheel 33 (upper side in FIG. 1). The proximal end side of the output shaft 34 is disposed inside the gear case 31, and the distal end side (the back side in FIG. 1) of the output shaft 34 extends to the outside of the gear case 31. A base end portion of the wiper blade is fixed to a portion (not shown) extending to the outside of the output shaft 34.

  Between the worm wheel 33 and the output shaft 34, a motion conversion mechanism 40 that converts the rotational motion of the worm wheel 33 into a swing motion and swings the output shaft 34 is provided. The motion conversion mechanism 40 is housed in a casing including the gear case 31 and the cover 32 together with the speed reduction mechanism SD. The motion conversion mechanism 40 includes a motion conversion member 41, a pinion gear 42, and a connecting plate 43. . Here, the pinion gear 42 is fixed to the base end side of the output shaft 34, and swings with the output shaft 34.

  The motion converting member 41 includes a main body 41a on the proximal end side and a sector gear 41b on the distal end side. The main body 41a is rotatably connected to a first connecting shaft P1 located at a position eccentric from the axial center of the worm wheel 33, that is, the wheel shaft 33b. On the other hand, the sector gear 41b is meshed with the pinion gear 42, and the second connecting shaft P2 is fixed to the axis of the sector gear 41b. A resin cap CP is attached to the first connecting shaft P1, and the resin cap CP is in sliding contact with the cover 32. Thereby, the smooth movement with respect to the cover 32 of the 1st connecting shaft P1 is enabled.

  The motion converting member 41 is in sliding contact with the upper surface portion US1 of the worm wheel 33, and the pinion gear 42 is in sliding contact with the upper surface portion US2 of the bottom portion 31a of the gear case 31. Here, the height position S between the upper surface portion US1 of the worm wheel 33 and the upper surface portion US2 of the bottom portion 31a coincides with the extending direction of the output shaft 34. Therefore, the backlash of the connection plate 43, the motion conversion member 41, and the pinion gear 42 can be suppressed by pressing the motion conversion member 41 and the pinion gear 42 toward the upper surface portions US1, US2 via the connection plate 43. ing.

  The connecting plate 43 as a connecting member is provided so as to overlap the cover 32 side of the motion converting member 41 and the pinion gear 42, and is formed into a predetermined shape by punching a steel plate or the like as shown in FIG. . The connection plate 43 includes a plate body 43a. A first connection portion 43b is provided on the proximal end side of the plate body 43a, and a second connection portion 43c is provided on the distal end side of the plate body 43a. A rubber spring 55 (see FIG. 2) is brought into contact with the plate body 43a in a state where the rear wiper motor 10 is assembled.

  As shown in FIG. 2, the first connecting portion 43b is rotatably connected to a second connecting shaft P2 at the axis of the sector gear 41b, and the second connecting portion 43c rotates to the proximal end side of the output shaft 34. It is connected freely. Thus, the connection plate 43 is configured to maintain a constant distance between the second connection shaft P2 and the output shaft 34, so that the engagement between the pinion gear 42 and the sector gear 41b is maintained. It has become.

  A resin spacer 50 that is in sliding contact with the cover 32 is provided on the cover 32 side of the connecting plate 43. The resin spacer 50 is formed in a predetermined shape from a resin material such as polyacetal (POM) having excellent self-lubricating properties, and is formed in a shape substantially the same as that of the connection plate 43 so as to overlap the connection plate 43. Here, the resin spacer 50 constitutes a sliding member in the present invention.

  As shown in FIG. 4, a slidable contact portion 51 that is formed in a substantially disc shape and is slidably contacted with the cover 32 is provided at the longitudinal center of the resin spacer 50. A grease holding groove 52 formed in a substantially Y shape is formed on the cover 32 side of the sliding contact portion 51. The grease holding groove 52 is formed in the grease holding groove 52 when the rear wiper motor 10 (see FIG. 1) is assembled. A sliding grease (not shown) having a relatively high viscosity is applied. Thereby, the operation | movement with respect to the cover 32 of the sliding contact part 51 becomes smooth, and by extension, the smooth operation | movement in the casing of the motion conversion mechanism 40 (refer FIG. 2) is ensured over a long term.

  On the other hand, on the side opposite to the cover 32 side of the sliding contact portion 51, a spring accommodating recess 53 that is recessed toward the cover 32 side is formed. A spring fixing convex portion 54 as an elastic member fixing portion is formed in the central portion of the spring accommodating concave portion 53, and the spring fixing convex portion 54 is formed in a cylindrical shape by natural rubber, synthetic rubber or the like. A rubber spring 55 as an elastic member is fixed. That is, the rubber spring 55 made of rubber is disposed at the center in the longitudinal direction of the resin spacer 50.

  Here, the depth dimension of the spring accommodating recess 53 is set to approximately ½ of the length dimension along the axial direction of the rubber spring 55, and approximately half of the rubber spring 55 is exposed from the spring accommodating recess 53 ( (See FIG. 2). Further, an annular gap RS is formed around the rubber spring 55 in a state in which the rubber spring 55 is fixed to the spring fixing convex portion 54, whereby the diameter when the rubber spring 55 is elastically deformed in the axial direction thereof is formed. An increase in directional dimension is allowed.

  As shown in FIG. 2, the rubber spring 55 is provided between the connecting plate 43 and the resin spacer 50 in the assembled state of the rear wiper motor 10, and is compressed in the axial direction by the length dimension d. It is in the state. That is, the rubber spring 55 presses the connecting plate 43 and the resin spacer 50 in a direction in which they are separated from each other.

  The pressing force F of the rubber spring 55 toward the connection plate 43 is transmitted to the sector gear 41 b and the pinion gear 42 via the connection plate 43. As a result, the sector gear 41b and the pinion gear 42 are pressed toward the upper surface portions US1 and US2, so that the sector gear 41b and the pinion gear 42 including the connecting plate 43 are prevented from rattling, that is, the motion conversion mechanism 40 is rattled. It has become.

  Here, in the present embodiment, the pressing force F of the rubber spring 55 is applied to the meshing portion CW between the sector gear 41b and the pinion gear 42. Therefore, it is possible to effectively suppress the rattling of the meshing portion CW that is particularly susceptible to rattling. The pressing force F of the rubber spring 55 is always applied to the meshing portion CW when the rear wiper motor 10 is operated.

  On both sides of the resin spacer 50 in the longitudinal direction, a first connecting portion 56 and a second connecting portion 57 formed in a substantially cylindrical shape are provided. The first connecting portion 56 is rotatably connected to a second connecting shaft P2 at the axis of the sector gear 41b, and the second connecting portion 57 is rotatably connected to the proximal end side of the output shaft 34. .

  Three projecting portions 56a and 57a are provided on the radially inner side of the connecting portions 56 and 57, respectively, so as to protrude radially inward of the connecting portions 56 and 57. The protrusions 56a and 57a extend in the axial direction of the connecting portions 56 and 57, and are arranged at equal intervals (120 degree intervals) in the circumferential direction of the connecting portions 56 and 57. The protrusions 56a and 57a are in line contact with the second connecting shaft P2 and the output shaft 34, so that the resin spacer 50 is smooth with respect to the second connecting shaft P2 and the output shaft 34. Can be rotated.

  A first bridging portion 56b and a second bridging portion 57b are provided between the connecting portions 56 and 57 and the sliding contact portion 51, respectively. The first bridging portion 56b is provided with reinforcing ribs 56c for ensuring the strength of the first bridging portion 56b, and the second bridging portion 57b is a meat for reducing the weight of the second bridging portion 57b. A stealing portion 57c is provided. However, these reinforcing ribs and meat stealing portions may be provided so as to have a reverse relationship to the above, or reinforcing ribs may be provided on both bridging portions 56b and 57b, or each bridging portion 56b and 57b. Meat stealing may be provided on both sides.

  Next, the operation of the rear wiper motor 10 formed as described above, in particular, the operation of the motion conversion mechanism 40 will be described in detail with reference to the drawings.

  As shown in FIG. 1, when the worm wheel 33 rotates with the rotation of the armature shaft 24, the first connecting shaft P1 rotates around the wheel shaft 33b. Then, the main body portion 41a of the motion converting member 41 also rotates around the wheel shaft 33b. As a result, the sector gear 41b swings about the second connecting shaft P2, and as a result, the pinion gear 42 meshed with the sector gear 41b, that is, the output shaft 34 swings.

  At this time, as shown in FIG. 2, the sliding contact portion 51 of the resin spacer 50 is in sliding contact with the cover 32. The sliding contact portion 51 is formed of a resin material such as polyacetal (POM) having excellent self-lubricating properties. Furthermore, a grease holding groove 52 is provided. Therefore, a large load is not applied to the motor unit 20 (see FIG. 1), and the motor unit 20 can be protected from burning and the like. In addition, since the pressing force F of the rubber spring 55 is always applied to the meshing portion CW, uneven wear of the meshing portion CW is prevented, and thus the quietness and wear resistance of the rear wiper motor 10 are improved. Can be made. Further, since the output shaft 34 receives an external force, there is a possibility that rattling of the meshing portion CW is induced by the external force, but the pressing force F of the rubber spring 55 prevents uneven wear and rattling of the meshing portion CW due to the external force. be able to.

  As described in detail above, according to the rear wiper motor 10 according to the first embodiment, the connecting plate 43 is provided with the resin spacer 50 slidably contacting the cover 32, and the connecting plate 43 and the resin spacer 50 are connected between the connecting plate 43 and the resin spacer 50. A rubber spring 55 is provided for pressing in a direction in which the nozzle 43 and the resin spacer 50 are separated from each other. Thereby, the resin spacer 50 and the rubber spring 55 can be collectively arranged on one side of the connecting plate 43. Therefore, the resin spacer 50 and the rubber spring 55 can be assembled together while suppressing the backlash of the motion conversion mechanism 40, and as a result, the assembly workability of the rear wiper motor 10 can be improved.

  Further, according to the rear wiper motor 10 according to the first embodiment, the spring fixing convex portion 54 is formed on the resin spacer 50, and the rubber spring 55 is fixed to the spring fixing convex portion 54. Therefore, the assembly of the rear wiper motor 10 is performed. Prior to the work, the resin spacer 50 and the rubber spring 55 can be integrated (sub-assembled) in advance. Therefore, the assembly workability of the rear wiper motor 10 can be further improved.

  Furthermore, according to the rear wiper motor 10 according to the first exemplary embodiment, since the rubber spring 55 is disposed at the center in the longitudinal direction of the connection plate 43, the play of the connection plate 43, the motion conversion member 41, and the pinion gear 42 is reduced by one rubber spring 55. Suppression can be effectively suppressed.

  Further, according to the rear wiper motor 10 according to the first embodiment, since the rubber spring 55 is used, for example, the length dimension of the rubber spring 55 is adjusted as compared with a coil spring, a leaf spring, a disc spring and the like made of steel. Thus, the spring load can be easily set. Further, if a coil spring, a leaf spring, a disc spring, or the like is simply employed, problems may arise such that these springs overlap each other and are difficult to peel off at the component supply stage in the assembly process of the rear wiper motor 10. In that case, it becomes necessary to temporarily stop the parts feeder and the like, leading to a deterioration in yield. On the other hand, the rubber spring 55 formed in the cylindrical shape as described above can easily cope with automatic assembly using a parts feeder or the like.

  Furthermore, according to the rear wiper motor 10 according to the first embodiment, since the grease holding groove 52 is formed on the cover 32 side of the sliding contact portion 51 that forms the resin spacer 50, the motion conversion mechanism 40 can operate smoothly. Of course, the wear resistance of the sliding contact portion 51 can be improved.

  Further, since the output shaft 34 receives an external force, there is a possibility that rattling due to the external force of the meshing portion CW may be induced. However, the pressing force F of the rubber spring 55 prevents uneven wear or rattling due to the external force of the meshing portion CW. be able to.

  Furthermore, since uneven wear and rattling of the meshing portion CW can be prevented, rattling of the output shaft 34 connected to the motion conversion mechanism 40 can be prevented. Therefore, the quietness of the rear wiper motor 10 and the wiping performance of the vehicle wiping surface can be improved.

  Next, Embodiments 2, 3, and 4 of the present invention will be described in detail with reference to the drawings. Note that portions having the same functions as those of the first embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted.

  5 is a perspective view showing a resin spacer and a rubber spring according to the second embodiment, FIG. 6 is a perspective view showing a resin spacer and a coil spring according to the third embodiment, and FIG. 7 is a resin spacer according to the fourth embodiment. The perspective view which shows a leaf | plate spring is shown, respectively.

  As shown in FIG. 5, the second embodiment is different from the first embodiment in that a rubber spring (elastic member) 60 formed in a bottomed cylindrical shape is employed. The rubber spring 60 is formed of a bottom portion 61 and a cylindrical side wall portion 62. A plurality of the rubber springs 60 are arranged along the circumferential direction of the side wall portion 62 on the side opposite to the bottom 61 side along the axial direction of the side wall portion 62. The notch 62a is formed. The notch 62a serves as an air passage for allowing air inside the rubber spring 60 to escape to the outside when the rubber spring 60 is attached to the spring fixing convex portion 54. Thereby, the rubber spring 60 can be accurately fixed to the spring fixing convex portion 54.

  As shown in FIG. 6, the third embodiment is different from the first embodiment in that a coil spring (elastic member) 70 made of a steel material is employed. Here, the inter-wire dimension L of the coil spring 70 is set to be smaller than the wire diameter dimension D of the coil spring 70 (L <D). Therefore, the coil springs 70 can be made difficult to overlap with each other, and automatic assembly using a parts feeder or the like can be handled.

  As shown in FIG. 7, the fourth embodiment is different from the first embodiment in that a leaf spring (elastic member) 80 made of a steel material is employed. The leaf spring 80 includes a main body portion 81 and a pair of arm portions 82 extending from both sides of the main body portion 81. A mounting hole 81 a is formed in the central portion of the main body portion 81, and an arcuate portion 82 a is formed on the distal end side of each arm portion 82. Further, the spring accommodating recess 53 and the spring fixing convex portion 54 (see FIG. 6) are not provided on the opposite side of the sliding contact portion 51 from the grease retaining groove 52 side. A fixing protrusion 83 for fixing the leaf spring 80 to the resin spacer 50 by being crushed after being inserted is provided. Here, by providing the arc-shaped portion 82a, the leaf springs 80 can be made difficult to overlap with each other, and automatic assembly using a parts feeder or the like can be supported.

  As described above in detail, the second, third, and fourth embodiments can achieve substantially the same operational effects as those of the first embodiment.

  Next, a fifth embodiment of the present invention will be described in detail with reference to the drawings. Note that portions having the same functions as those of the first embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted.

  FIG. 8 is a plan view showing a rear wiper motor (without a cover) according to Embodiment 5, and FIG. 9 is a partially enlarged sectional view taken along line BB in FIG.

  As shown in FIGS. 8 and 9, the rear wiper motor (wiper motor) 90 according to the fifth embodiment differs from the first embodiment in the position of the output shaft 34 and the structure of the motion conversion mechanism 100.

  The output shaft 34 is rotatably supported at a portion (left side in FIG. 8) away from the worm wheel 33 of the gear case 31. A motion conversion mechanism 100 is provided inside the gear case 31 and between the proximal end side of the output shaft 34 and the worm wheel 33. The motion conversion mechanism 100 includes a connection plate 43 and a swing link (swing member) 101.

  The base end side of the connection plate 43 is rotatably connected to the first connection shaft P <b> 1 of the worm wheel 33, and the front end side of the connection plate 43 extends toward the output shaft 34. Like the connecting plate 43, the swing link 101 is formed in a predetermined shape by punching a steel plate or the like. The proximal end side of the swing link 101 is fixed to the proximal end side of the output shaft 34, and the distal end side of the swing link 101 is turnable to the distal end side of the connection plate 43 via the second connection shaft P2. It is connected. Here, the length dimension of the swing link 101 is set to be approximately half (substantially 1/2) the length dimension of the connecting plate 43.

  The motion conversion mechanism 100 formed in this way operates as follows. That is, the rotational force reduced and increased in torque by the rotation of the worm gear 24a and the worm wheel 33 is transmitted to the first connecting shaft P1, and the first connecting shaft P1 rotates around the wheel shaft 33b. Then, the base end side of the connection plate 43 also rotates about the wheel shaft 33b, and thereby the output shaft 34 is in a state where the front end side of the connection plate 43 is regulated by the swing link 101 via the second connection shaft P2. Is swung around.

  As shown in FIG. 9, the connecting plate 43 is slidably in contact with both the upper surface portion US1 of the worm wheel 33 and the upper surface portion US3 of the swing link 101 that are matched at the height position S1. As a result, the pressing force F of the rubber spring 55 is transmitted to the worm wheel 33 and the swing link 101 via the connection plate 43, and consequently, the backlash of the motion conversion mechanism 100 including the connection plate 43 is suppressed.

  As described above in detail, also in the fifth embodiment, substantially the same operational effects as those of the first embodiment described above can be achieved. In addition, in the fifth embodiment, since the motion conversion mechanism 100 does not include a gear meshing portion, the operation sound of the rear wiper motor 90 can be further reduced and the wear resistance can be further improved. Can do.

  It goes without saying that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention. For example, in the above embodiments, the present invention is applied to the rear wiper motor 10 as a wiper motor. However, the present invention is not limited to this, and a wiper motor of a front wiper device of a vehicle such as an automobile, an aircraft, The present invention can also be applied to wiper motors for wiper devices such as ships and railway vehicles.

  In each of the above embodiments, the resin spacer 50 is formed of a resin material such as polyacetal (POM). However, the present invention is not limited to this, and the resin spacer 50 is formed of a resin material excellent in self-lubricity. If it is good.

10 Rear wiper motor (wiper motor)
DESCRIPTION OF SYMBOLS 11 Fastening screw 20 Motor part 21 Motor case 21a Flange part 22 Magnet 23 Armature 24 Armature shaft 24a Worm gear 25 Commutator 26 Armature core 27 Coil 28 Power supply brush 30 Gear part 31 Gear case (casing)
31a bottom 31b wall 32 cover (casing)
33 Worm wheel (rotating body)
33a Gear teeth 33b Wheel shaft 34 Output shaft 40 Motion conversion mechanism 41 Motion conversion member 41a Body portion 41b Sector gear 42 Pinion gear 43 Connection plate (connection member)
43a Plate body 43b First connecting portion 43c Second connecting portion 50 Resin spacer (sliding contact member)
51 Sliding contact portion 52 Grease holding groove 53 Spring accommodating recess portion 54 Spring fixing convex portion 55 Rubber spring (elastic member)
56 1st connection part 56a Protrusion part 56b 1st bridge part 56c Reinforcement rib 57 2nd connection part 57a Projection part 57b 2nd bridge part 57c Meat stealing part 60 Rubber spring (elastic member)
61 bottom 62 side wall 62a notch 70 coil spring (elastic member)
80 Leaf spring (elastic member)
81 Body portion 81a Mounting hole 82 Arm portion 82a Arc-shaped portion 83 Fixing protrusion 90 Rear wiper motor (wiper motor)
100 motion conversion mechanism 101 swing link (swing member)
BB Ball bearing BF Bearing fitting part CP Resin cap CU Connector unit CW Engagement part F Pressing force P1 First connecting shaft P2 Second connecting shaft RS Annular clearance SD Deceleration mechanism SP Stopper plate US1, US2, US3 Upper surface

Claims (6)

A wiper motor having a motion conversion mechanism that converts the rotational motion of a rotating body into a swing motion to swing the output shaft,
The motion conversion mechanism is
A motion converting member connected to a first connecting shaft at a base end side deviated from the axis of the rotating body, and provided with a sector gear on the front end side;
A pinion gear fixed to the output shaft and meshed with the sector gear;
A base member that is connected to a second connecting shaft at the base end of the sector gear and a tip end of the connecting member is connected to the output shaft;
With
The connecting member is provided with a sliding contact member that is in sliding contact with a casing that houses the motion conversion mechanism, and a direction in which the connecting member and the sliding contact member are separated from each other between the connecting member and the sliding contact member. A wiper motor provided with an elastic member that presses against the wiper motor. A wiper motor having a motion conversion mechanism that converts the rotational motion of a rotating body into a swing motion to swing the output shaft,
The motion conversion mechanism is
A base member connected to a first connecting shaft at a position eccentric from the axis of the rotating body, and a connecting member having a distal end extending toward the output shaft;
A oscillating member having a proximal end fixed to the output shaft and a distal end connected to the distal end of the connecting member via a second connecting shaft;
With
The connecting member is provided with a sliding contact member that is in sliding contact with a casing that houses the motion conversion mechanism, and a direction in which the connecting member and the sliding contact member are separated from each other between the connecting member and the sliding contact member. A wiper motor provided with an elastic member that presses against the wiper motor. The wiper motor according to claim 1 or 2,
A wiper motor in which an elastic member fixing portion is formed on the sliding contact member, and the elastic member is fixed to the elastic member fixing portion. The wiper motor according to any one of claims 1 to 3,
The wiper motor, wherein the elastic member is disposed at a longitudinal center of the connecting member. The wiper motor according to any one of claims 1 to 4,
A wiper motor, wherein the elastic member is made of rubber. In the wiper motor according to any one of claims 1 to 5,
A wiper motor, wherein a grease retaining groove is formed on the casing side of the sliding member.

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