JP4768153B2 - Two-stage gear assembly jig - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a two-stage gear assembling jig used for meshing a two-stage gear formed by integrally arranging a large-diameter gear and a small-diameter gear on the same axis with one pinion.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a gear device configured by engaging a two-stage gear, in which a large-diameter gear and a small-diameter gear are arranged on the same axis and integrally formed with one pinion, for example, used in a power unit for a battery-assisted bicycle There is.
In the power unit, a motor is disposed in a wheel hub so as to be positioned on the same axis as the axle, and a plurality of the two-stage gears are disposed around an output pinion of the motor. The two-stage gear has a large-diameter gear meshed with the output pinion and a small-diameter gear meshed with an internal gear of the hub.
[0003]
Since the number of teeth is different between the large-diameter gear and the small-diameter gear, in order to mesh all the two-stage gears with the output pinion and the internal gear, the phase in the rotational direction of each two-stage gear must be matched. I must.
Conventionally, in order to make this phase coincide with each other, a mark serving as a reference for the phase is provided on the large-diameter gear, and the positions when all the two-stage gears are assembled are set using this mark. To describe in detail, the mark is described so as to point to one tooth on the end face in the axial direction of the large-diameter gear (the end face connected to the small-diameter gear), and by meshing the tooth indicated by this mark with the output pinion, The phase of each two-stage gear is matched.
This phase alignment operation is performed when the two-stage gears are engaged with the output pinion one by one.
[0004]
[Problems to be solved by the invention]
However, as described above, if two-stage gears are incorporated one by one and phase adjustment is performed each time, the time required for the assembly operation becomes longer. In addition to the fact that a plurality of two-stage gears must be assembled in sequence, the output pinion may rotate during installation, causing the two-stage gear incorporated earlier and the two-stage gear incorporated this time to be out of phase. This is because work must be done carefully so that there is no such thing.
[0005]
In addition, since the phase alignment mark is written on the end face in the axial direction of the large-diameter gear, when the output pinion and the two-stage gear are helical gears, the mark is viewed from the axial direction. The two-stage gear must be rotated by the amount of twist of the teeth from the state of pointing to the teeth, and the working time is further increased.
In addition, when the module is small, the phase alignment mark is also small, which not only makes the operation difficult, but also makes it difficult to find an installation error.
[0006]
The present invention has been made to solve such a problem, and an object thereof is to allow a plurality of two-stage gears to be easily assembled.
[0007]
[Means for Solving the Problems]
In order to achieve this object, the two-stage gear assembling jig according to the present invention comprises a holding means that is formed of a flexible material and detachably holds all the two-stage gears by its own elasticity. It is constituted by phase matching means for matching the marks indicating the reference positions in the rotational direction of the two-stage gears so as to match the phases of all the two-stage gears.
[0008]
According to the present invention, a plurality of two-stage gears can be assembled on the assembled side at a time. Further, since the phases of the two-stage gears can be matched while the two-stage gears are held by the holding means, the alignment is simpler than the case where the marks are aligned while being incorporated.
[0009]
The jig for assembling the two-stage gear according to the invention described in claim 2 is the jig for assembling the two-stage gear according to the invention described in claim 1, wherein the holding means includes the gear portion of each two-stage gear. The two-stage gear is held by being fitted into the hole.
According to this invention, the gear part fitted in the hole of the holding means is protected by the holding means.
[0010]
A two-stage gear assembly jig according to the invention described in claim 3 is the two-stage gear assembly jig according to the invention described in claim 1, wherein the holding means is formed in substantially the same shape as the pinion. And a holding pinion that meshes the large-diameter gears of all the two-stage gears, and a holding arm for each two-stage gear that urges the small-diameter gear in the direction in which the holding pinion is located.
According to the present invention, the holding arm can be formed on the side of the small-diameter gear so as to overlap the large-diameter gear when viewed from the axial direction.
[0011]
The jig for assembling the two-stage gear according to the invention described in claim 4 is the jig for assembling the two-stage gear according to the invention described in claim 1, wherein the holding means is provided in the shaft hole of each two-stage gear. The structure is such that all the two-stage gears are held by the inserted support shaft.
According to this invention, it can hold | maintain so that it may be in the same state as an assembled state before incorporating all the two-stage gears.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
Hereinafter, an embodiment of a two-stage gear assembly jig according to the present invention will be described in detail with reference to FIGS. Here, a reduction gear of a power unit for a battery-assisted bicycle will be described as an example of a gear device incorporating a two-stage gear.
FIG. 1 is a sectional view of a power unit for a battery-assisted bicycle that incorporates a two-stage gear using a two-stage gear assembling jig according to the present invention, FIG. 2 is a sectional view showing a state immediately before the two-stage gear is assembled, and FIG. FIG. 4 is a diagram showing the assembled state of the two-stage gear, FIG. 4 is a diagram showing the two-stage gear assembling jig according to the present invention, (a) is a plan view, and (b) is a diagram (a). It is BB sectional drawing in FIG.
[0013]
In these drawings, what is indicated by reference numeral 1 is a power unit for a battery-assisted bicycle according to this embodiment. The power unit 1 is provided on the rear wheel of a battery-assisted bicycle (not shown), and houses a motor 3 and a speed reducer 4 in a hub 2 as shown in FIG. The hub 2 includes a hub body 5 formed in a cylindrical shape with a bottom and a lid body 6 that closes an opening of the hub body 5, and an axle 8, which will be described later, includes a motor housing 7 as a part. The bearings 9 and 10 are rotatably supported. The axle 8 includes the motor housing 7, a first support shaft 11 fixed to one end portion (left end portion in FIG. 1) of the motor housing 7, and a support plate fixed to the other end portion by a fixing bolt 12. 13 and a second support shaft 14 fixed to the support plate 13.
[0014]
The speed reducer 4 decelerates the rotation of the output pinion 21 of the motor 3 and transmits it to the hub 2. The large diameter gear 23 of the two-stage gear 22 made of synthetic resin is engaged with the output pinion 21, and the small diameter is reduced. The gear 24 is meshed with the internal gear 25 on the hub 2 side. Each gear of the speed reducer 4 is a helical gear. A one-way clutch 26 for transmitting only the driving force of the motor 3 to the hub 2 is interposed between the internal gear 25 and the hub 2 (lid body 6). The human power is transmitted to the hub 2 from a free wheel (not shown) screwed to the threaded portion 6 a at the end of the lid 6.
[0015]
The two-stage gear 22 includes a large-diameter gear 23 and a small-diameter gear 24 which are positioned on the same axis and are integrally formed adjacent to each other, and a fixed shaft 28 is inserted into the shaft hole 27 via the fixed shaft 28. The motor housing 7 and the support plate 13 are rotatably supported. The fixed shaft 28 is sandwiched between the motor housing 7 and the support plate 13. In this embodiment, as shown in FIG. 3, three two-stage gears 22 are arranged around the output pinion 21. The two-stage gear 22 has a phase alignment mark 29 on the axial end surface of the large-diameter gear 23 on the small-diameter gear 24 side. FIG. 3 is drawn with the two-stage gear 22 turned so that the mark 29 is directed to the output pinion 21.
[0016]
These three two-stage gears 22 are held in the same state as the assembled state by an assembling jig denoted by reference numeral 31 in FIG. The assembling jig 31 is formed of a flexible material, and holds three holding plates 32 that sandwich the large-diameter gear 23 of each two-stage gear 22 and these holding plates 32 connected to each other. The cylinder 33 is integrally formed. Examples of a material for forming the jig 31 include foamed plastic and rubber. The holding plate 32 constitutes holding means according to the present invention.
[0017]
As shown in FIG. 4A, the holding plate 32 is formed in a triangular shape when viewed from the axial direction so as to face between the large diameter gears 23 adjacent to each other. The two side surfaces 32 a, 32 a in contact with the large-diameter gear 23 in the holding plate 32 have an arc shape whose center coincides with the large-diameter gear 23, so that the radius of curvature is slightly smaller than the outer diameter of the large-diameter gear 23. Is formed. That is, the assembling jig 31 inserts the large-diameter gear 23 into a hole formed with the side surfaces 32 a of the three holding plates 32 as inner walls, and sandwiches the large-diameter gear 23 by the elasticity of the holding plate 32. It is formed as follows.
[0018]
As described above, the positions where the holding plates 32 are formed are such that the positions of the two-stage gears 22 in the state where the large-diameter gear 23 is held between the side surfaces 32a and 32a coincide with the positions in the assembled state. Is set. That is, by inserting and holding the large-diameter gear 23 between the holding plates 32, the three two-stage gears 22 are arranged with the same positional relationship as in the assembled state.
[0019]
Further, marks 34 for matching the phases of all the two-stage gears 22 are formed on the rear end face (the face appearing in FIG. 4) of the holding plate 32 in the assembling direction. This mark 34 constitutes the phase matching means according to the present invention. The marks 34 are formed so that the positions of all the holding plates 32 coincide. That is, by aligning the mark 34 for phase alignment of the two-stage gear 22 with the mark 34, the phases of all the two-stage gears 22 are matched.
Further, the assembling jig 31 is formed so that the outer diameter d is smaller than the opening diameter D of the hub body 5 on the assembling side.
[0020]
In order to incorporate the three two-stage gears 22 into the hub 2 using the assembling jig 31 formed as described above, the motor 3 is assembled to the hub 2 in advance as shown in FIG. A fixed shaft 28 for supporting the two-stage gear 22 is erected on the motor 3. The two-stage gear 22 is attached to the assembling jig 31 from the front side in the assembling direction. That is, the large-diameter gear 23 is fitted between the holding plates 32 and is held by the elasticity of the holding plates 32.
[0021]
Then, as shown in FIG. 4A, the respective two-stage gears 22 are rotated to align the phase alignment mark 29 with the mark 34 of the assembling jig 31. Next, with the three two-stage gears 22 held by the assembling jigs 31 as described above, the fixed shafts 28 are inserted into the shaft holes 27 of all the two-stage gears 22, and the two-stage gears are inserted. 22 is inserted into the hub body 5 together with the assembling jig 31. Since the outer diameter d of the assembling jig 31 is smaller than the opening diameter D of the hub body 5, the entire assembling jig 31 can be inserted into the hub body 5.
[0022]
By this insertion operation, each large-diameter gear 23 of the two-stage gear 22 meshes with the output pinion 21. At this time, each of the two-stage gears 22 meshes with the output pinion 21 while being held in phase by the assembling jig 31 and is a helical gear. Rotate around 28 respectively. The above insertion operation is continued until the axial end surface of the two-stage gear 22 abuts against the seat surface of the motor housing 7, and then the assembly jig with the two-stage gear 22 pressed to the motor housing 7 side. Only 31 is pulled out in the opposite direction. Thus, the assembly work of the two-stage gear 22 is completed by removing the assembly jig 31.
After the two-stage gear 22 is assembled, the support plate 13 is fixed to the motor housing 7 with the fixing bolt 12, and the internal gear 25, the one-way clutch 26, and the lid body 6 are assembled. The internal gear 25 accurately meshes with all the small-diameter gears 24 because the phases of the three two-stage gears 22 match when assembled.
[0023]
Therefore, by using the assembling jig 31 shown in this embodiment, the three two-stage gears 22 can be assembled into the hub 2 at a time. In addition, since the phase of each of the two-stage gears 22 can be matched while the two-stage gears 22 are held on the assembling jig 31, the positioning becomes easier than when the marks are aligned while being assembled. The alignment can be performed by aligning the mark 29 of the two-stage gear 22 with the mark 34 of the assembling jig 31 for each of the two-stage gears 22, and the work is simplified, so that it is artificially mistakenly assembled. Can be prevented in advance.
[0024]
Furthermore, the assembling jig 31 according to this embodiment has a structure in which the large gear 23 is fitted into the hole in which the side surface 32a of the three holding plates 32 is the inner wall and the two-stage gear 22 is held. Therefore, the large-diameter gear 23 can be protected by the holding plate 32.
Furthermore, since the outer diameter d of the assembling jig 31 is set to be smaller than the opening diameter D of the hub body 5, the three two-stage gears 22 are held by the assembling jig 31. It can be attached to the fixed shaft 28 and meshed with the output pinion 21 while maintaining the above. In other words, the three two-stage gears 22 can be assembled with high accuracy while maintaining the phase in phase.
[0025]
In this embodiment, a fixed shaft 28 is erected in advance in the motor housing 7, the fixed shaft 28 is inserted into the shaft hole 27 of each two-stage gear 22, and the output pinion 21 meshes with the large-diameter gear 23. Since the assembling procedure for removing the assembling jig 31 is employed, the two-stage gear 22 can be held by the assembling jig 31 until it is positioned at the final assembling position. For this reason, the two-stage gear 22 can be incorporated so that a slight positional deviation does not occur. The fixed shaft 28 may be inserted into the shaft hole 27 from the rear in the assembling direction after the two-stage gear 22 is engaged with the output pinion 21.
[0026]
By adopting this assembling procedure, it is only necessary to perform positioning for the output pinion 21 only at the initial stage of embedding, so that the most carefully performed process of assembling work is simplified and the working time is further reduced. Can do. After engaging the large-diameter gear 23 with the output pinion 21, the assembly jig 31 is rotated to position the shaft hole 27 of each two-stage gear 22 in the mounting hole for the fixed shaft 28 of the motor housing 7. 28 is installed.
[0027]
(Second Embodiment)
The assembling jig 31 can be formed as shown in FIGS.
5 is a plan view showing an assembling jig for holding a small-diameter gear, FIG. 6 is a plan view showing an assembling jig having a holding pinion, and FIG. 7 shows an assembling jig having a support shaft. FIG. 8 is a plan view taken along line VIII-VIII in FIG. In these drawings, the same or equivalent members as those described with reference to FIGS. 1 to 4 are denoted by the same reference numerals, and detailed description thereof is omitted as appropriate.
[0028]
The assembling jig 31 shown in FIG. 5 is formed in a Y shape in plan view, and a circular hole 42 into which the small-diameter gear 24 is fitted from the front side in the assembling direction is formed in each side 41 of the Y shape. . Each side 41 of the Y shape constitutes a holding means according to the present invention. Further, a through hole 43 is formed in the central portion where the Y-shaped sides 41 intersect so that the meshing portion between the output pinion 21 and the large-diameter gear 23 can be seen.
Thus, the small-diameter gear 24 can be protected by the assembling jig 31 by fitting and holding the small-diameter gear 24 in the circular hole 42 of the assembling jig 31.
[0029]
The assembling jig 31 shown in FIG. 6 constitutes the assembling jig 31 according to the invention described in claim 3, and has three holding holes in which long holes 51 into which the small-diameter gear 24 is fitted are formed. An arm 52 and a holding pinion 53 that protrudes forward from the central portion where these arms 52 intersect in the assembling direction are integrally formed. This holding pinion 53 has teeth equivalent to those of the output pinion 21, and meshes the large-diameter gear 23. The holding arm 52 urges the small-diameter gear 24 toward the holding pinion 53 in a state where the small-diameter gear 24 is fitted into the long hole 51 and the large-diameter gear 23 is engaged with the holding pinion 53. It is formed with a length.
Since the holding jig 52 is formed so that the holding arm 52 overlaps the large diameter gear 23 when viewed from the axial direction on the side of the small diameter gear 24, There is no protruding part and it can be formed small.
[0030]
The assembling jig 31 shown in FIGS. 7 and 8 is formed in a triangular shape, and each of the two-stage gears 22 is held by a cylindrical support shaft 61 projecting from each apex of the triangle. The assembling jig 31 constitutes the assembling jig 31 according to the invention described in claim 3.
The support shaft 61 is formed so as to be slightly thicker than the shaft hole 27 of the two-stage gear 22, and is generated by the elastic force (pressing force in the diameter expansion direction) generated when the support shaft 61 is fitted in the shaft hole 27. The step gear 22 is held. The interval between the support shafts 61 is set to be the same as that of the fixed shaft 28 on the motor housing 7 side.
[0031]
Further, in this assembling jig 31, a triangular hole 62 is formed at the center so that the meshing portion between the output pinion 21 and the large-diameter gear 23 can be seen. The hole 62 is formed so that the corner 62 a is directed to the axis of the support shaft 61. By forming the holes 62 in this way, the phases of all the two-stage gears 22 can be matched by aligning the phase alignment marks 29 of the two-stage gears 22 with the corners 62a. It is not necessary to provide a mark on the tool 31 side.
[0032]
In the assembling jig 31 thus formed, the two-stage gear 22 is held on the support shaft 61 so that the two-stage gear 22 is in the same state as when it is incorporated into the fixed shaft 28. That is, since all the two-stage gears 22 can be held in the same state as the assembled state before assembling, the two-stage gear 22 can be positioned more accurately during the assembling.
[0033]
Further, in this assembling jig 31, the connecting portion 63 between the support shafts 61 protrudes toward the large diameter gear 23 as shown in FIG. 8, and the small diameter gear 24 meshes with the connecting portion 63. Teeth 64 are formed. Since the teeth 64 can prevent the two-stage gear 22 from rotating, the phase of the two-stage gear 22 is shifted when the assembly jig 31 is transported or stored while the two-stage gear 22 is held. There is no.
[0034]
【The invention's effect】
As described above, according to the present invention, a plurality of two-stage gears can be assembled on the assembled side at a time. Further, since the phases of the two-stage gears can be matched while the two-stage gear is held by the holding means, the positioning becomes easier compared with the case where the marks are aligned while being assembled.
Therefore, by using the two-stage gear assembly jig according to the present invention, a plurality of two-stage gears can be assembled accurately in a short time. Even when the built-in pinion and the two-stage gear are helical gears, the phases of all the two-stage gears can be reliably matched, reducing man-hours and preventing misassembly. .
[0035]
According to the second aspect of the present invention, since the gear portion fitted in the hole of the holding means is protected by the holding means, the gear portion is prevented from coming into contact with other members during transportation or storage and being damaged. Can do.
[0036]
According to the third aspect of the present invention, the holding arm can be formed on the side of the small-diameter gear so as to overlap the large-diameter gear when viewed from the axial direction, and thus protrudes to the side of the two-stage gear. Thus, a small two-stage gear assembly jig can be formed.
[0037]
According to the fourth aspect of the present invention, since all the two-stage gears can be held in the same state as the assembled state before assembling all the two-stage gears, the two-stage gears can be positioned more accurately during the assembling.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a power unit for a battery-assisted bicycle that incorporates a two-stage gear by a two-stage gear assembling jig according to the present invention.
FIG. 2 is a sectional view showing a state immediately before the two-stage gear is assembled.
FIG. 3 is a diagram showing an assembled state of a two-stage gear.
FIG. 4 is a view showing a two-stage gear assembling jig according to the present invention.
FIG. 5 is a plan view showing an assembling jig for holding a small-diameter gear.
FIG. 6 is a plan view showing an assembling jig having a holding pinion.
FIG. 7 is a plan view showing an assembling jig having a support shaft.
8 is a cross-sectional view taken along line VIII-VIII in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 7 ... Motor housing, 21 ... Output pinion, 22 ... Two-stage gear, 23 ... Large diameter gear, 24 ... Small diameter gear, 27 ... Shaft hole, 28 ... Fixed shaft, 29, 34 ... Mark, 31 ... Assembling jig , 32 ... holding plate, 42 ... circular hole, 51 ... long hole, 52 ... holding arm, 53 ... holding pinion, 61 ... support shaft.

Claims (4)

Holds multiple two-stage gears that are formed by aligning large-diameter gears and small-diameter gears on the same axis, and meshes each large-diameter gear with the built-in pinion by matching the phases of all the two-stage gears. A jig for assembling the gear, and holding means for detachably holding all the two-stage gears by their own elasticity formed of a flexible material, and a reference position in the rotation direction of each of the two-stage gears A two-stage gear assembling jig comprising phase matching means for matching the marks shown to match the phases of all the two-stage gears. The two-stage gear assembling jig according to claim 1, wherein the holding means is configured to hold the two-stage gear by fitting the gear portion of each two-stage gear into the hole. . 2. The jig for assembling a two-stage gear according to claim 1, wherein the holding means includes a holding pinion that is formed in substantially the same shape as the pinion and meshes with the large-diameter gears of all the two-stage gears, and the holding pinion includes A two-stage gear assembling jig provided with a holding arm for each of the two-stage gears that urges the small-diameter gear toward the position. The two-stage gear assembling jig according to claim 1, wherein the holding means has a structure in which all the two-stage gears are held by a support shaft fitted into a shaft hole of each two-stage gear. Ingredients.

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