JP4579096B2 - Power seat gear box - Google Patents

Description

  The present invention relates to a power seat gear box that includes a gear driven by a driving source such as a motor and moves a seat, a headrest, and the like.

As a gear box of this type of power seat, a gear box used for a power seat for a vehicle is known. For example, Japanese Patent Application Laid-Open No. 2004-106713 (publication FIG. 4) discloses an apparatus that moves a seat back and forth by a motor. FIG. 6 is an exploded perspective view of a gear box provided in the apparatus. The gear box includes a worm 551 into which the output shaft 561 is inserted and fixed, covers 512 and 514 in which holes 512a and 514a are inserted through the rotation shaft of the worm 551, a worm 521 that meshes with the worm 551, and the worm. Covers 531 and 533 formed with holes 531a and 533a through which the rotation shaft of 521 is inserted, and dampers 511 and 513 fitted to the outside of these covers 531 and 533, respectively. The side portions of the adjacent covers are assembled to each other, the worm 551 is engaged with the worm 521, both ends of the rotating shaft of the worm 551 are inserted into the holes 512 a and 514 a of the covers 512 and 514, and both ends of the rotating shaft of the worm 521 are inserted. Are inserted through holes 531a and 533a of covers 531 and 533, respectively.
This gear box is fixed to the upper rail by a bracket 505. Inside the worm 521, a female screw is formed along the rotation axis direction, and a screw screw fixed to the lower rail is meshed with this female screw. The output shaft 561 is connected to a rotating shaft of a motor attached between a pair of opposed upper rails.
Then, the rotation of the motor causes the worm 521 to rotate through the worm 551, and the upper rail to which the seat is attached moves along the screw screw (see FIG. 2).

Japanese Patent Laying-Open No. 2004-106713 (paragraphs 36 to 42, FIGS. 2 and 4)

However, since the gear box constitutes two worm bearings by assembling the four covers into a box shape, if an error occurs in the joining position of the covers, the rotation center of the worm is shifted, There is a problem that play occurs between the worms.
Further, since it is necessary to simultaneously engage the worms and assemble the four covers, there is also a problem that the assembly is not easy.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to realize a power seat gear box which is less likely to cause backlash between gears and can be easily assembled.

In order to achieve the above object, according to the first aspect of the present invention, in the first aspect of the present invention, the first gear (30) connected to the rotation shaft of the drive source, and the first gear (30) and the rotation shafts are orthogonal to each other. The second gear (40) engaged with each other, the first bearing (11) that rotatably supports one end (32) of the rotating shaft of the first gear (30), and the rotating shaft of the second gear (40). A first housing (10) having a second bearing (16) for rotatably supporting one end (42) and the other end (33) of the rotating shaft of the first gear (30) are rotatable. And a second housing (20) integrally formed with a third bearing (21) that is supported on the shaft and a fourth bearing (26) that rotatably supports the other end (43) of the rotating shaft of the second gear (40). ) and a, one end of the rotary shaft of the first gear (30) (3 ) Is supported by the first bearing (11) of the first housing (10), and one end (42) of the rotating shaft of the second gear (40) meshed with the first gear (30) is the first housing. Supported by the second bearing (16) of (10) and the other end (43) of the rotation shaft of the second gear (40) is supported by the fourth bearing (26) of the second housing (20). In this state, the second housing (20) is pivoted about the fourth bearing (26) and joined to the first housing (10), so that the rotational axis of the first gear (30) The technical means that the end (33) is configured to be supported by the third bearing (21) is used.

In the invention according to claim 2 , in the gearbox (1) of the power seat according to claim 1 , the other end (33) of the rotating shaft of the first gear (30) is interposed via a wave washer (50). The bearing member (60) is inserted into the bearing hole (61), and the bearing member (60) is formed in a truncated cone shape and contacts the outer surface (52) of the wave washer (50). A large-diameter end face that is in contact exists on the first gear (30) side, and a peripheral surface (64) from the periphery of the large-diameter end face to the periphery of the small-diameter end face is formed in a tapered shape, The third bearing (21) uses technical means that a fitting portion (28a) into which the peripheral surface (64) of the bearing member (60) is fitted is formed.

According to a third aspect of the present invention, in the gearbox (1) of the power seat according to the first or second aspect, of the first housing (10) and the second housing (20) assembled to each other. The first bearing (11) of the first housing (10) and the third bearing (21) of the second housing (20) have fastening holes (15, 15) communicating from one bearing to the other bearing. 25) are formed, and the first housing (10) and the second housing (20) are mutually connected by inserting a fastening member (70) from one fastening hole to the other fastening hole and fastening them. It is fixed.

According to a fourth aspect of the present invention, in the gear box (1) of the power seat according to any one of the first to third aspects, a female screw is provided inside the rotating shaft of the second gear (40). A female screw hole (45) formed in the inner wall surface is formed to penetrate in the axial direction, and a screw screw (7) having a male screw meshing with the female screw is inserted into the female screw hole (45). The gear box (1) and the screw screw (7) use technical means that they are provided so as to be relatively movable by the power source.

In the invention according to claim 5 , in the gear box (1) of the power seat according to claim 4 , the gear box (1) is fixed to the lower rail (5) arranged on the floor surface of the vehicle. The screw screw (7) is fixed to an upper rail (6) that is movably assembled to the lower rail (5).
In addition, the code | symbol in said parenthesis respond | corresponds with the code | symbol used in embodiment mentioned later.

(Effect of the invention according to claim 1)
Since the first housing has a first bearing that rotatably supports one end of the rotating shaft of the first gear and a second bearing that rotatably supports one end of the rotating shaft of the second gear, There is no need to assemble the first bearing and the second bearing, and there is no possibility of errors due to the assembly.
The second housing has a third bearing that rotatably supports the other end of the rotating shaft of the first gear and a fourth bearing that rotatably supports the other end of the rotating shaft of the second gear and is integrally molded. Therefore, it is not necessary to assemble the third bearing and the fourth bearing, and there is no possibility that errors due to the assembly occur.
That is, according to the first aspect of the present invention, it is only necessary to assemble the two members of the first housing and the second housing, so that the generation of the assembly error can be reduced as compared with the conventional structure in which the four members are assembled. Therefore, it is possible to realize a power seat gearbox that is less likely to be loose between gears and can be easily assembled.

Furthermore, one end of the first gear is supported by the first bearing of the first housing, one end of the second gear engaged with the first gear is supported by the second bearing of the first housing, and the other end of the second gear is While the second housing is supported by the fourth bearing of the second housing, the second housing is rotated about the fourth bearing and joined to the first housing, so that the other end of the rotating shaft of the first gear is the third bearing. It is comprised so that it may be in the state supported by.
That is, since the first housing includes a first bearing that supports one end of the first gear and a second bearing that supports one end of the second gear meshed with the first gear, the first gear and the second gear are provided. It can be assembled to the first housing in a meshed state. Moreover, since the 1st bearing and the 2nd bearing are integrally molded, the state which the 1st gear and the 2nd gear mesh | engaged can be maintained. Thereby, the other end of the second gear can be easily supported by the fourth bearing of the second housing. Further, from this state, the other end of the rotary shaft of the first gear is supported by the third bearing by a simple operation of rotating the second housing around the fourth bearing and joining the first housing. Can be in a state.
Therefore, according to the invention which concerns on Claim 1, an assembly can be performed more easily than the conventional gear box which uses four bearing members.

(Effect of the invention according to claim 2 )
The other end of the rotating shaft of the first gear is inserted into the bearing hole of the bearing member via the wave washer, and the bearing member is fitted into the fitting portion of the third bearing. Since it is pressed against the fitting portion by the spring force of the wave washer, there is no possibility that the bearing member is displaced from the fitting portion.
Moreover, since the part fitted to the fitting part of a 3rd bearing becomes a taper shape corresponding to the surrounding surface of a bearing member among bearing members, the surrounding surface of a bearing member shifts | deviates to a fitting part. And can be fitted accurately.
Furthermore, the peripheral surface formed in the bearing member is formed in a taper shape, and a large-diameter end surface exists on the first gear side. That is, it is formed in a shape that is narrowed down without corners from the periphery of the large-diameter end surface to the periphery of the small-diameter end surface. And the fitting part of a 3rd bearing is formed in the shape where the taper-shaped surrounding surface of a bearing member fits.
Therefore, the second housing is rotated about the fourth bearing in the joining direction with the first housing with the other end of the rotating shaft of the first gear inserted through the bearing hole of the bearing member through the wave washer. Thus, the bearing member enters the fitting portion first from the end surface of the small diameter, and then enters the fitting portion along the peripheral surface and is fitted to the fitting portion, so that the bearing member is placed around the fitting portion. Since there is no possibility of collision, the first housing can be smoothly and quickly joined.

(Effect of the invention according to claim 3 )
The first housing and the second housing can be fixed to each other by a simple operation of inserting and fastening the fastening member from the fastening hole formed in one bearing to the fastening hole formed in the other bearing. .

(Effect of the invention according to claim 4 )
As described above, according to the first aspect of the present invention, it is only necessary to assemble the two members of the first housing and the second housing. Therefore, the occurrence of an assembly error is reduced as compared with the conventional structure in which the four members are assembled. Therefore, it is possible to realize a gear box that hardly generates backlash between worms.
Therefore, in the gear box having the structure described in claim 4 , the screw screw and the gear box inserted through the second gear can be rotated relatively smoothly.

(Effect of the invention according to claim 5 )
As described above, according to the first aspect of the present invention, the number of parts can be reduced as compared with the prior art, and accordingly, the gear box can be reduced in weight and size.
Therefore, as described in claim 5 , when the gear box is fixed to the lower rail disposed on the floor of the vehicle, and the screw screw is fixed to the upper rail movably assembled to the lower rail. The gear box can be reduced in size in response to a request to shorten the width of the lower rail in the short direction.
Further, in the case of a structure in which the lower rail moves, the gear box can be reduced in weight in response to a request for reducing the weight of the lower rail.

[Main structure]
A main structure of a gear box (hereinafter abbreviated as a gear box) of a power seat according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing components of a gear box. FIG. 2 is a perspective view of FIG. FIG. 3 is an explanatory view showing an assembly process of the gear box. 3A is an explanatory view showing a state before joining the first housing and the second housing, FIG. 3B is an explanatory view showing a state where the first housing and the second housing are joined, and FIG. ) Is an explanatory view showing a state where the first housing and the second housing are fastened with screws. FIG. 4 is an explanatory view showing a state in which the gear box is fixed to the lower rail. 4A is a cross-sectional view showing the state cut along the rail direction, and FIG. 4B is an explanatory view showing the gear box of FIG. 4A in an enlarged manner. 1, the one end 32 side of the first gear 30 is the left side, the other end 33 side is the right side, the one end 42 side of the second gear 40 is the front, and the other end 43 side is the rear. In FIG. 4A, the left side is the front of the vehicle.

As shown in FIG. 1, the gear box 1 includes a first housing 10, a second housing 20, a first gear 30, a second gear 40, a wave washer 50, and a bearing member 60. A second gear 40 is provided on the first gear 30 such that its tooth portion 41 meshes with the tooth portion 31 of the first gear 30. The rotation axis of the first gear 30 and the rotation axis of the second gear 40 are orthogonal to each other. One end 32 of the rotating shaft projects from one end face of the first gear 30 and the other end 33 of the rotating shaft projects from the other end face. From one end surface of the second gear 40, one end 42 of the rotating shaft is formed to protrude, and from the other end surface, the other end 43 of the rotating shaft is formed to protrude. As shown in FIG. 2, a cable insertion hole 32 a for inserting a cable 71 connected to the motor is formed inside one end 32 of the first gear 30. In this embodiment, the tip of the cable 71 is formed in a square cross section, and the cable insertion hole 32a having a shape matching the shape is formed from the end surface of the one end 32 to the inside of the first gear 30 along the rotation axis. ing.
The inside of the second gear 40 is formed in a hollow that penetrates from one end 42 to the other end 43 in the axial direction, and on the inner wall surface, there is a male screw formed on the peripheral surface of the screw screw 7 (FIG. 4). A meshing female screw hole 45 is formed. In this embodiment, the first gear 30 is a worm and the second gear 40 is a worm wheel.

The first housing 10 is configured by integrally molding a first bearing 11 that rotatably supports one end 32 of the first gear 30 and a second bearing 16 that rotatably supports one end 42 of the second gear 40. ing. For this reason, since there is no possibility that the positional relationship between the first bearing 11 and the second bearing 16 is shifted, it is difficult for backlash between the gears due to the deviation to occur.
In the first bearing 11, a first housing portion 12 that houses a half of one end of the gear body of the first gear 30 is recessed, and the first gear is formed on the front and rear walls of the first housing portion 12. Corresponding to the outer shape of the 30 tooth portions 31, notched portions 13 that are notched in an arc shape are formed. A bearing hole 18 (FIG. 2) is formed in the left wall portion of the first accommodating portion 12 so that the one end 32 of the first gear 30 is inserted and rotatably supported. Further, screw holes 15 for screwing screws 70 (FIG. 3) are formed in front of and behind the first housing portion 12 of the first bearing 11, respectively. Furthermore, at the upper rear of the first bearing 11, when the first housing 10 and the second housing 20 are joined, a fitting portion 14 into which a part of the peripheral surface of the fourth bearing 26 of the second housing 20 is fitted. Is formed.
The second bearing 16 is formed in front of the upper portion of the first bearing 11, and in the front-rear direction thereof, a bearing hole 17 that penetrates one end 42 of the second gear 40 and supports it rotatably is formed in the front-rear direction. Has been.

The second housing 20 is formed by integrally molding a third bearing 21 that rotatably supports the other end 33 of the first gear 30 and a fourth bearing 26 that rotatably supports the other end 43 of the second gear 40. It is configured. For this reason, since there is no possibility that the positional relationship between the third bearing 21 and the fourth bearing 26 is shifted, it is difficult for backlash between the gears due to the shift to occur.
The third bearing 21 is formed with a recessed second housing portion 22 (FIG. 3A) that houses the other half of the gear body of the first gear 30. The walls are formed with cutout portions 23 that are cut out in an arc shape corresponding to the outer shape of the tooth portion 31 of the first gear 30. In addition, screw insertion holes 25 for inserting screws 70 (FIG. 3) are formed in front of and behind the second housing portion 22 of the second bearing 21. Each screw insertion hole 25 communicates with each screw hole 15 when the first housing 10 and the second housing 20 are joined. On the periphery of each screw insertion hole 25, a fitting portion 25a for fitting and housing the head of the screw 70 is formed. Furthermore, when the first housing 10 and the second housing 20 are joined to the upper front of the third bearing 21, a fitting portion 24 into which a part of the peripheral surface of the second bearing 16 of the first housing 10 is fitted. Is formed.
The fourth bearing 26 is formed on the upper rear side of the third bearing 21, and in the front-rear direction, a bearing hole 27 that passes through the other end 43 of the second gear 40 and supports it rotatably penetrates in the front-rear direction. Is formed.

The other end 33 of the first gear 30 is inserted into the bearing hole 61 of the bearing member 60 via the wave washer 50. The bearing member 60 is formed in a truncated cone shape, and has a large-diameter end surface that abuts on the right side surface (outer surface) 52 of the wave washer 50 on the left side (first gear 30 side). A peripheral surface 64 from the peripheral edge 62 of the diameter end surface to the peripheral edge 63 of the small diameter end surface is formed in a tapered shape. That is, the bearing member 60 has a truncated cone shape (shade shape) in which the bearing holes 61 are formed penetrating in the left-right direction, and a cross-sectional shape orthogonal to the central axis is formed in an annular shape.
A fitting portion 28 a (FIG. 3A) into which the peripheral surface 64 of the bearing member 60 is fitted is formed on the periphery of the insertion hole 28 of the third bearing 21. The other end 33 of the first gear 30 is inserted into the through hole 51 of the wave washer 50 and further inserted into the bearing hole 61 of the bearing member 60.

[Assembly method]
Next, a method for assembling the gear box 1 will be described.
(First step)
First, one end 32 of the first gear 30 is inserted into the bearing hole 18 of the first bearing 11 of the first housing 10, and one end 42 of the rotating shaft of the second gear 40 is inserted into the bearing hole 17 of the second bearing 16, The first gear 30 and the second gear 40 are engaged with each other. Of course, the end 42 of the first gear 30 may be inserted into the bearing hole of the first bearing 11 after the end 42 of the second gear 40 is inserted into the bearing hole 17 of the second bearing 16. That is, in the first step, each end of the first gear 30 and the second gear 40 is inserted into each bearing of the first housing 10.

(Second step)
Next, the other end 33 of the first gear 30 is inserted into the through hole 51 of the wave washer 50 and further inserted into the bearing hole 61 of the bearing member 60. Of course, this second step may be performed before the first step. Moreover, you may perform in the middle of a 1st process.

(Third step)
Next, as shown in FIG. 3A, the other end 43 of the second gear 40 whose one end 42 is inserted into the bearing hole 17 of the second bearing 16 is replaced with the bearing hole of the fourth bearing 26 of the second housing 20. 27 is inserted. At this stage, the second housing 20 is rotatable about the other end 43 of the second gear 40 inserted through the bearing hole 27 of the fourth bearing 26. In the second housing 20, the other end 43 of the second gear 40 is inserted into the bearing hole 27, which is the center of rotation, so that the rotation direction is uniquely determined, so the rotation direction is adjusted. There is no need to do.
Then, as shown in FIG. 3B, the second housing 20 is rotated and joined (matched) to the first housing 10. At this time, the peripheral surface 64 of the bearing member 60 into which the other end 33 of the first gear 30 is inserted is fitted into a fitting portion 28 a formed at the periphery of the insertion hole 28 of the third bearing 21. Further, since the peripheral surface 64 of the bearing member 60 is tapered and has no corners, the bearing member 60 may collide with the end of the fitting portion 28a when the second housing 20 is rotated. There is no.

(4th process)
Next, as shown in FIG. 3C, screws 70 are screwed into the respective screw holes 15 through the respective screw insertion holes 25 formed in the third bearing 21, and the first housing 10 and the second housing 20 are mutually connected. Fix it. At this time, the wave washer 50 interposed between the right end surface 30 a of the first gear 30 and the large-diameter end surface of the bearing member 60 is deformed by receiving pressure from the left and right directions due to fastening of the screws 70. For this reason, since the bearing member 60 is pressed against the fitting portion 28a by the spring force of the wave washer 50 and is fixed to the fitting portion 28a, there is no possibility that the bearing hole 61 and the insertion hole 28 are displaced.

  As described above, since the gear box 1 has a structure in which the two gears are rotatably supported by only the two housings, the gear box 1 can be easily assembled. In particular, since the second housing 20 can be joined to the first housing 10 at an accurate position simply by rotating, there is no need to align the housings. Further, since the other end 33 of the first gear 30 is inserted into the insertion hole 28 only by rotating the second housing 20, it is not necessary to separately perform the operation of inserting the other end 33 into the bearing hole.

As shown in FIG. 4, the gear box 1 assembled as described above is fixed to a lower rail 5 disposed on the floor surface of the vehicle. As shown in FIG. 4B, the gear box 1 is housed and fixed in a box-like bracket 2, and the bracket 2 is housed and fixed in a box-shaped space by brackets 3 and 4. The brackets 3 and 4 are fixed to the lower rail 5 by bolts 8 and 8. A screw screw 7 is inserted through the upper bracket 4 in the front-rear direction, and the screw screw 7 is inserted through a female screw hole 45 of the second gear 40.
An upper rail 6 is disposed above the lower rail 5 so as to be movable in the front-rear direction. The front end and the rear end of the screw screw 7 are fixed to the back surface of the upper rail 6 by brackets 80, respectively.

Each bracket 80 includes a first fixed piece 81 fixed to the back surface of the upper rail 6 by bolts 83 and 93 and a second fixed piece 82 suspended from the end of the first fixed piece 81. The front end of the screw screw 7 is inserted into the second fixed piece 82 of the front bracket 80 and is welded to the second fixed piece 82. Further, a male screw is carved on the peripheral surface of the rear end of the screw screw 7, and a nut 95 is fastened to the rear end protruding from the rear surface of the second fixing piece 82 of the rear bracket 80. Thus, the rear end of the screw screw 7 is fixed to the second fixing piece 82.
A cable 71 connected to a rotating shaft of a motor (not shown) is connected to the cable insertion hole 32a formed inside the one end 32 of the first gear 30. And the 1st gear 30 rotates via the cable 71 by the rotation of the motor, and the 2nd gear 40 rotates. When the second gear 40 rotates, the screw screw 7 moves in the front-rear direction with respect to the lower rail 5, and the upper rail 6 moves in the front-rear direction.

  As described above, when the gear box 1 is used for fixing to the lower rail 5, since the gear box 1 has a small number of parts, it can be reduced in size, and the width of the lower rail 5 in the short direction is reduced. Can meet the demands. In addition, by forming at least one of the first gear 30 and the second gear 40 from a synthetic resin, it is possible to reduce mechanical noise generated during gear rotation.

[Effect of the embodiment]
(1) If the gear box 1 of the above-described embodiment is used, the first housing 10 has the first bearing 11 and the rotary shaft of the second gear 40 that rotatably support the one end 32 of the rotary shaft of the first gear 30. Since the first bearing 11 and the second bearing 16 are integrally formed with the second bearing 16 that rotatably supports the one end 42 thereof, there is no possibility that an error due to the assembly is generated.
The second housing 20 includes a third bearing 21 that rotatably supports the other end 33 of the rotating shaft of the first gear 30 and a fourth bearing that rotatably supports the other end 43 of the rotating shaft of the second gear 40. 26 and is integrally molded, the assembly of the third bearing 21 and the fourth bearing 26 is unnecessary, and there is no possibility that an error due to the assembly occurs.
In other words, since only two members, the first housing 10 and the second housing 20, need to be assembled, the assembly error can be reduced as compared with the conventional structure in which the four members are assembled. It is difficult to realize a gear box that can be easily assembled.

(2) One end 32 of the first gear 30 is supported by the first bearing 11 of the first housing 10, and one end 42 of the second gear 40 meshed with the first gear 30 is the second bearing 16 of the first housing 10. The second housing 20 is rotated about the fourth bearing 26 with the other end 43 of the second gear 40 supported by the fourth bearing 26 of the second housing 20. And the other end 33 of the rotating shaft of the first gear 30 is configured to be supported by the third bearing 21.
That is, the first housing 10 includes the first bearing 11 that supports the one end 32 of the first gear 30 and the second bearing 16 that supports the one end 42 of the second gear 40 that meshes with the first gear 30. The first gear 30 and the second gear 40 can be assembled to the first housing 10 in a meshed state. Moreover, since the 1st bearing 11 and the 2nd bearing 16 are integrally molded, the state which the 1st gear 30 and the 2nd gear 40 mesh | engaged can be maintained. Thereby, the other end 43 of the second gear 40 can be easily supported by the fourth bearing 26 of the second housing 20. Furthermore, from this state, the other end 33 of the rotating shaft of the first gear 30 is connected to the third housing 30 by a simple operation of rotating the second housing 20 around the fourth bearing 26 and joining the first housing 10. It can be in the state supported by the bearing 21.
Therefore, the assembly can be performed more easily than the conventional gear box using four bearing members.

(3) Further, the other end 33 of the rotating shaft of the first gear 30 is inserted into the bearing hole 61 of the bearing member 60 via the wave washer 50, and the bearing member 60 is fitted to the fitting portion 28 a of the third bearing 21. Since the bearing member 60 is pressed against the fitting portion 28a by the spring force of the wave washer 50, there is no possibility that the bearing member 60 is displaced from the fitting portion 28a.
(4) Moreover, since the peripheral surface 64 fitted to the fitting part 28a of the 3rd bearing 21 is a taper shape among the bearing members 60, the peripheral surface 64 of the bearing member 60 is shifted to the fitting part 28a. Can be accurately fitted without any problems. Furthermore, the peripheral surface 64 is fitted into the fitting portion 28a, so that the bearing hole 61 of the bearing member 60 and the insertion hole 28 of the third bearing 21 can be automatically matched. That is, the alignment of the bearing hole 61 of the bearing member 60 and the insertion hole 28 of the third bearing 21 can be performed very easily.

(5) The large-diameter end surface of the bearing member 60 exists on the first gear 30 side, and the peripheral surface 64 from the peripheral edge 62 of the large-diameter end surface to the peripheral edge 63 of the small-diameter end surface is formed in a tapered shape. Has been. That is, it is formed in a shape with no corners and narrowed from the peripheral edge 62 to the peripheral edge 63. And the fitting part 28a of the 3rd bearing 21 is formed in the shape where the peripheral surface 64 of the bearing member 60 fits.
Accordingly, the second housing 20 is centered on the fourth bearing 26 with the first housing 10 in a state where the other end 33 of the rotation shaft of the first gear 30 is inserted into the bearing hole 61 of the bearing member 60 via the wave washer 50. , The bearing member 60 first enters the fitting portion 28a from the peripheral edge 63, then enters the fitting portion 28a along the peripheral surface 64, and is fitted to the fitting portion 28a. Therefore, since there is no possibility that the bearing member 60 collides with the periphery of the fitting portion 28a, the joining with the first housing 10 can be performed smoothly and quickly.

(6) Screws 70 and 70 are passed through screw insertion holes 25 and 25 formed in the third bearing 21 of the second housing 20, and into the screw holes 15 and 15 formed in the first bearing 11 of the first housing 10. The first housing 10 and the second housing 20 can be fixed to each other by a simple operation just by screwing.
(7) Since it is only necessary to assemble the two members of the first housing 10 and the second housing 20, it is possible to reduce the occurrence of an assembly error as compared with the conventional structure in which the four members are assembled. A gear box that does not easily occur can be realized.
Accordingly, the screw screw 7 and the gear box 1 inserted through the second gear 40 can be rotated relatively smoothly.

(8) Since the number of parts can be reduced as compared with the prior art, the gear box can be reduced in weight and size accordingly.
Therefore, when the gear box is fixed to the lower rail 5 arranged on the floor of the vehicle and the screw screw 7 is fixed to the upper rail 6 movably assembled to the lower rail 5, the short of the lower rail 5 is used. The gearbox can be miniaturized in response to the demand for shortening the width in the hand direction.
Further, in the case of a structure in which the lower rail 5 moves, the gear box can be reduced in weight in response to a request to reduce the weight of the lower rail 5.

<Other embodiments>
(1) FIG. 5 is an explanatory view showing a gear box of another embodiment, FIG. 5 (A) is a perspective view of the first and second housings, and FIG. 5 (B) is a first housing and a second housing. FIG. 5C is an explanatory view showing a state in which the first housing and the second housing are fastened with screws.
Cutout portions 11a are formed at both corners of the inner lower portion of the first housing 10, and projections 11b are formed at both corner portions of the upper portion of the first housing 10, respectively. . Protrusions 21a having shapes matching the notches 11a are respectively formed at both end corners of the inner lower portion of the second housing 20, and at both end corners of the inner upper portion of the second housing 20, the projecting portions 11b are formed. A notch 21b having a shape for fitting is formed in each notch. When the second housing 20 is rotated about the fourth bearing 26 and joined to the first housing 10, the projections 21 a of the second housing 20 are fitted into the notches 11 a of the first housing 10. Each protrusion 11b is fitted to the portion 21b.
According to this configuration, the load in the front-rear direction applied to the gear box 1 is not limited to the screws 70, 70, the portions where the notches 11 a and the protrusions 21 a are fitted, and the notches 21 b and the protrusions. Since it can receive also in the part by which 11b was fitted, the intensity | strength of the gear box 1 can be raised further. In addition, since it is the same structure as above-mentioned embodiment except having each notch part 11a and each protrusion part 21a, each effect of the above-mentioned embodiment can be show | played.

(2) In the above embodiment, as an example of the use of the gearbox of the present invention, the use of moving the upper rail in the front-rear direction has been described as an example. Therefore, it can be used for applications in which the upper rail moves in the front-rear direction.
(3) The gearbox of the present invention can also be used for applications in which a headrest provided in a vehicle seat is moved in the vertical direction by a drive source such as a motor. For example, the lower part of the shaft that supports the headrest is formed as a screw screw, and the screw screw can be inserted into the second gear 40. And a headrest is moved to an up-down direction with the gear box 1 accommodated in the backrest of a sheet | seat, and the motor which operates the gear box 1. FIG.
(4) The structure of the gear box 1 is not limited to the structure described in the above embodiment without departing from the technical scope of the present invention, and can be changed in design.

It is a perspective view which shows the component of the gear box which concerns on embodiment of this invention. FIG. 2 is a perspective view of FIG. 1. It is explanatory drawing which shows the assembly process of a gear box. 2A is an explanatory view showing a state before joining the first housing and the second housing, FIG. 2B is an explanatory view showing a state where the first housing and the second housing are joined, and FIG. ) Is an explanatory view showing a state in which the first housing and the second housing are fastened with screws. It is explanatory drawing which shows the state by which the gear box was fixed to the lower rail. 4A is a cross-sectional view showing the state cut along the rail direction, and FIG. 4B is an explanatory view showing the gear box of FIG. 4A in an enlarged manner. It is a perspective view which shows the component of a slide rail. FIG. 5 is an explanatory view showing a gear box according to another embodiment, FIG. 5 (A) is a perspective view of the first and second housings, and FIG. 5 (B) is a joint of the first housing and the second housing. FIG. 5C is an explanatory view showing a previous state, and FIG. 5C is an explanatory view showing a state in which the first housing and the second housing are fastened with screws. It is a disassembled perspective view of the conventional gear box.

Explanation of symbols

1. ・ Gearbox, 5. ・ Lower rail, 6. ・ Upper rail,
7. Screw screw, 10. First housing, 11. First bearing,
15 .. Screw hole (fastening hole), 16 .. Second bearing, 20 .. Second housing,
21 .. Third bearing, 25 .. Screw insertion hole (fastening hole), 28 .. Bearing hole,
28a ... Fitting part, 30 ... first gear, 32 ... one end, 33 ... other end,
40 ·· Second gear, 42 ·· One end, 43 · · other end, 45 · · female screw hole,
50..Wave washer, 60..Bearing member, 61..Bearing hole, 62..Ring,
63 ·· Periphery, 64 ·· Peripheral surface, 70 ·· Screw (fastening member).

Claims (5)

A first gear coupled to the rotation shaft of the drive source;
A second gear meshing with the first gear and the rotating shaft orthogonal to each other;
A first housing integrally formed with a first bearing rotatably supporting one end of the rotating shaft of the first gear and a second bearing rotatably supporting one end of the rotating shaft of the second gear;
A second housing integrally formed with a third bearing that rotatably supports the other end of the rotating shaft of the first gear and a fourth bearing that rotatably supports the other end of the rotating shaft of the second gear; equipped with a,
One end of the rotating shaft of the first gear is supported by the first bearing of the first housing, and one end of the rotating shaft of the second gear engaged with the first gear is supported by the second bearing of the first housing. In addition, with the other end of the rotation shaft of the second gear supported by the fourth bearing of the second housing, the second housing is rotated about the fourth bearing and joined to the first housing. By doing so, the other end of the rotating shaft of the first gear is configured to be supported by the third bearing . The other end of the rotating shaft of the first gear is inserted into the bearing hole of the bearing member via a wave washer,
The bearing member is formed in a truncated cone shape, and has a large-diameter end surface that abuts on the outer surface of the wave washer on the first gear side. Further, the bearing member has a small-diameter from the periphery of the large-diameter end surface. The peripheral surface over the periphery of the end surface is formed in a taper shape,
The gearbox for a power seat according to claim 1, wherein the third bearing is formed with a fitting portion into which the peripheral surface of the bearing member is fitted . Of the first housing and the second housing assembled to each other, the first bearing of the first housing and the third bearing of the second housing have a fastening hole communicating from one bearing to the other bearing. claim There are formed respectively, the first housing and the second housing, characterized in that it is secured to one another by fastening by inserting a fastening member from one of the fastening hole in the other fastening hole A gearbox for a power seat according to claim 1 or 2. A female screw hole in which an internal thread is formed in the inner wall surface is formed in the rotation shaft of the second gear in the axial direction, and a male screw that meshes with the female screw is formed in the peripheral surface of the female screw hole. screw has been inserted, the gear box and the screw is according to any one of claims 1 to 3, characterized in being et provided relatively movable by the power source Power seat gearbox. The gear box is fixed to the lower rail disposed on the floor of the vehicle, the screw thread is according to claim 4, characterized in Rukoto fixed to the upper rail assembled to be movable in the lower rail Power seat gearbox.

Images