JP2003014058A - Holder for mounting two-stage gear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily mount a plurality of two-stage gears. SOLUTION: This holder has a holding plate 32 that is made of flexible material and removably holds all two-stage gears 22 with its own elasticity. The holder has marks 34 for matching phases of all two-stage gears 22 by matching marks 29 indicating reference positions in the rotation direction of each two-stage gear 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jig for assembling a two-stage gear used for engaging a two-stage gear in which a large-diameter gear and a small-diameter gear are arranged side by side on the same axis and integrally formed with one pinion. It is a thing.

[0002]

2. Description of the Related Art Conventionally, a gear unit constituted by engaging a two-stage gear in which a large-diameter gear and a small-diameter gear are arranged side by side on the same axis and integrally formed into one pinion is, for example, a power unit for an electric auxiliary bicycle. Some are used. In this power unit, a motor is arranged in a hub of wheels so as to be positioned on the same axis as the axle, and a plurality of the two-stage gears are arranged around an output pinion of the motor. In this two-stage gear, a large-diameter gear meshes with the output pinion and a small-diameter gear meshes with the internal gear of the hub.

Since the large-diameter gear and the small-diameter gear have different numbers of teeth, in order to mesh all the two-stage gears with the output pinion and the internal gear, the phases of the two-stage gears in the rotational direction are made to coincide with each other. I have to keep it. Conventionally, in order to match the phases, a mark serving as a reference of the phase is provided on the large-diameter gear, and the marks are used to set the positions of all the two-stage gears when assembled. More specifically, the mark is described so as to point to one tooth on the axial end surface of the large-diameter gear (the end surface connected to the small-diameter gear), and by engaging the teeth indicated by this mark with the output pinion, The phase of each two-stage gear is matched. This phase matching work was performed when the two-stage gears were assembled one by one by meshing with the output pinion.

[0004]

However, if the two-stage gears are incorporated one by one and the phases are adjusted each time as described above, the time required for the assembling work becomes long. This is because, in addition to having to install a plurality of two-stage gears in sequence, the output pinion rotates during assembly and the phase of the two-stage gear that was installed earlier and the two-stage gear that is installed this time is out of phase. This is because the work must be carried out carefully so that it will not occur.

Further, since the mark for phase matching 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 seen from the axial direction. It is necessary to rotate the two-stage gear by the amount of the twist of the teeth from the state in which indicates the teeth of the output pinion, which further increases the working time. Furthermore, when the module is small, the phase alignment mark is also small, which not only makes the work difficult but also makes it difficult to detect an assembly error.

The present invention has been made to solve the above problems, and an object thereof is to make it possible to easily assemble a plurality of two-stage gears.

[0007]

In order to achieve this object, a jig for assembling a two-stage gear according to the present invention is formed of a material having flexibility, and all the two-stage gears are attached and detached by their own elasticity. It is constituted by holding means for holding freely and phase matching means for matching the phases of all the two-stage gears by matching marks indicating the reference positions in the rotation direction of the respective two-stage gears.

According to the present invention, a plurality of two-stage gears can be assembled on the assembled side at once. Further, since the phases of the respective two-stage gears can be made to coincide with each other while the holding means holds the two-stage gears, the alignment is easier than the case where the marks are aligned while being assembled.

A two-stage gear assembling jig according to a second aspect of the present invention is the two-stage gear assembling jig according to the first aspect of the invention, wherein the holding means is provided for each two-stage gear. The gear part is fitted in the hole to hold the two-stage gear. According to this invention, the gear portion fitted in the hole of the holding means is protected by the holding means.

A jig for assembling a two-stage gear according to a third aspect of the present invention is the jig for assembling a two-stage gear according to the first aspect of the invention, wherein the holding means has substantially the same shape as the pinion. A holding pinion that is formed on all of the two-stage gears and that meshes with the large-diameter gears, and a holding arm for each two-stage gear that biases the small-diameter gear in the direction in which the holding pinion is located. is there. According to the present invention, the holding arm can be formed on the side of the small diameter gear so as to overlap with the large diameter gear when viewed in the axial direction.

A jig for assembling a two-stage gear according to a fourth aspect of the present invention is the jig for assembling a two-stage gear according to the invention as set forth in claim 1, wherein the holding means is provided for each of the two-stage gears. It has a structure in which all the two-stage gears are held by a support shaft fitted in the shaft hole. According to the present invention, it is possible to hold all the two-stage gears so that they are in the same state as the assembled state before being assembled.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION (First Embodiment) An embodiment of a two-stage gear assembling jig according to the present invention will be described in detail below with reference to FIGS. Here, as a gear device incorporating a two-stage gear, a speed reducer of a power unit for an electric assisted bicycle will be described as an example. FIG. 1 is a cross-sectional view of a power unit for an electric assisted bicycle that incorporates a two-stage gear with a two-stage gear incorporating jig according to the present invention, FIG. 2 is a cross-sectional view showing a state immediately before the two-stage gear is incorporated, and FIG. FIG. 4 is a diagram showing a state in which a two-stage gear is assembled, FIG. 4 is a diagram showing a jig for incorporating a two-stage gear according to the present invention, FIG. 4A is a plan view, and FIG. 6 is a sectional view taken along line BB in FIG.

In these figures, the reference numeral 1 designates the power unit for an electrically assisted bicycle according to this embodiment. This power unit 1 is provided on the rear wheel of an electric power-assisted bicycle (not shown), and as shown in FIG.
A motor 3 and a speed reducer 4 are housed in the hub 2. The hub 2 includes a hub body 5 formed in a bottomed cylindrical shape and a lid body 6 that closes an opening of the hub body 5.
A motor housing 7 is rotatably supported by bearings 9 and 10 on an axle 8 which will be described later and is configured as a part. The axle 8 includes the motor housing 7 and one end of the motor housing 7 (end on the left side in FIG. 1).
The support shaft 13 is fixed to the first support shaft 11 by means of a fixing bolt 12 and the second support shaft 14 is fixed to the support plate 13.

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 meshes with the output pinion 21. The small diameter 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. Further, 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 (cover 6). Human power is transmitted to the hub 2 from a free wheel (not shown) screwed to the threaded portion 6a at the end of the lid body 6.

The two-stage gear 22 has a large-diameter gear 23 and a small-diameter gear 24 positioned on the same axis and formed adjacent to each other so as to be integrally formed, and a fixed shaft 28 is inserted through a shaft hole 27 to form the fixed shaft 28. Through the motor housing 7 and the support plate 1
3 and 3 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 mark 29 for phase alignment on the axial end face of the large-diameter gear 23 on the small-diameter gear 24 side.
Is written. In FIG. 3, the two-stage gear 22 is rotated so that the mark 29 is directed to the output pinion 21.

These three two-stage gears 22 are held by the assembling jig indicated by reference numeral 31 in FIG. 4 in the same state as the assembling state, and are incorporated into the hub 2 at a time. The assembling jig 31 is
It is made of a flexible material, and three holding plates 32 for holding the large-diameter gear 23 of each two-stage gear 22 and a cylinder 33 for connecting and holding these holding plates 32 are integrally formed. ing. The material for forming the jig 31 is, for example, foamed plastic or rubber. The holding plate 32 constitutes the holding means according to the present invention.

As shown in FIG. 4A, the holding plate 32 is formed in a triangular shape as seen from the axial direction so as to face between the large-diameter gears 23 adjacent to each other. The two side surfaces 32 of the holding plate 32 that are in contact with the large-diameter gear 23
The a and 32a are arcuate shapes whose centers coincide with the large diameter gear 23, and are formed so that the radius of curvature is slightly smaller than the outer diameter of the large diameter gear 23. That is, in this assembling jig 31, the large-diameter gear 23 is fitted into the holes formed by using the side surfaces 32 a of the three holding plates 32 as inner walls, and the holding plates 32 are attached.
The large-diameter gear 23 is sandwiched by the elasticity of the.

The position where each holding plate 32 is formed is the position where each two-stage gear 22 is in the assembled state when the large-diameter gear 23 is held between the side surfaces 32a, 32a as described above. It is set to match. That is, the holding plate 32
By inserting and holding the large-diameter gear 23 between them, the three two-stage gears 22 are arranged with the same positional relationship as in the assembled state.

Further, a mark 34 for making the phases of all the two-stage gears 22 coincide with each other is formed on the rear end surface (the surface appearing in FIG. 4) of the holding plate 32 in the assembling direction. The 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 are the same. That is, by aligning the mark 34 for phase matching of the two-stage gear 22 with this mark 34, the phases of all the two-stage gears 22 match. 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 assembled side.

In order to assemble the three two-stage gears 22 into the hub 2 by using the assembling jig 31 formed as described above, as shown in FIG. A fixed shaft 28 for supporting the two-stage gear 22 is provided upright 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 held by the elasticity of the holding plates 32.

Then, as shown in FIG. 4A, the respective two-stage gears 22 are rotated to align the marks 29 for phase matching with the marks 34 of the assembling jig 31. Next, as described above, with the three two-stage gears 22 held by the assembling jig 31, 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. Outer diameter d of the assembling jig 31
Is smaller than the opening diameter D of the hub body 5, so the assembling jig 3
The entire 1 can be inserted into the hub body 5.

By this insertion work, 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 by the assembling jig 31 so as to be in phase with each other. Rotate around 28 respectively. The insertion work is continued until the axial end surface of the two-stage gear 22 comes into contact with the seat surface of the motor housing 7, and then the assembling jig with the two-stage gear 22 being pressed toward the motor housing 7 side. 31
Only pull out in the opposite direction. By removing the assembling jig 31 in this way, the assembling work of the two-stage gear 22 is completed. After the two-stage gear 22 is assembled, the support plate 13 is fixed to the motor housing 7 with the fixing bolts 12, and the internal gear 25, the one-way clutch 26, and the lid 6 are assembled. The internal gear 25 accurately meshes with all the small-diameter gears 24 because the three two-stage gears 22 have the same phase when assembled.

Therefore, by using the assembling jig 31 shown in this embodiment, the three two-stage gears 2 are
2 can be incorporated into the hub 2 at a time. Further, since the phases of the respective two-stage gears 22 can be matched with each other while the two-stage gears 22 are held by the assembling jig 31, the alignment becomes easier as compared with the case where the marks are aligned while being assembled. Positioning can be performed by aligning the mark 29 of the two-step gear 22 with the mark 34 of the assembling jig 31 for each two-step gear 22, and the work is simplified, so that the work can be artificially erroneously assembled. Can be prevented.

Further, the assembling jig 31 according to this embodiment has a structure in which the large-diameter gear 23 is fitted in the holes whose side walls 32a of the three holding plates 32 are inner walls to hold the two-stage gear 22. Since it has been adopted, the large-diameter gear 23 can be protected by the holding plate 32. Furthermore, the assembling jig 31
Since the outer diameter d of the two is set to be smaller than the opening diameter D of the hub body 5, the three two-stage gears 22 are incorporated into the jig 3 for assembling.
It can be mounted on the fixed shaft 28 and meshed with the output pinion 21 while maintaining the state held by 1. That is, the three two-stage gears 22 can be accurately assembled while keeping the phases in phase with each other.

In this embodiment, the motor housing 7
A fixed shaft 28 is installed upright in advance, and the fixed shaft 28 is inserted into the shaft hole 27 of each two-stage gear 22 so that the output pinion 21 meshes with the large diameter gear 23 and then the assembling jig 31 is removed. Since the assembling procedure is adopted, the two-stage gear 22 can be held by the assembling jig 31 until it is positioned at the final assembling position. Therefore, the two-stage gear 22 can be incorporated so that a slight positional deviation does not occur. The fixed shaft 28 has the two-stage gear 22 and the output pinion 2
After engaging with 1, the shaft hole 27 may be inserted from the rear side in the assembling direction.

By adopting this assembling procedure, the positioning to be performed at the initial stage of assembling may be performed only on the output pinion 21, so that the most careful step of the assembling work is simplified and the working time is further increased. It can be shortened. After the large-diameter gear 23 is meshed with the output pinion 21, the assembling 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. Install 28.

(Second Embodiment) The assembling jig 31 can be formed as shown in FIGS. Figure 5
7 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.
Is a plan view showing an assembling jig having a support shaft, and FIG. 8 is a sectional view taken along line VIII-VIII in FIG. In these figures, the same or equivalent members as those described with reference to FIGS. 1 to 4 are designated by the same reference numerals, and detailed description thereof will be appropriately omitted.

The assembling jig 31 shown in FIG. 5 is formed in a Y shape in a plan view, and each side 41 of the Y shape has a small diameter gear 24.
A circular hole 42 is formed so as to be inserted from the front side in the assembling direction. Each side 41 of the Y-shape constitutes the holding means according to the present invention. In addition, a through hole 43 is formed at the center where the Y-shaped sides 41 intersect so that the meshing portion of the output pinion 21 and the large-diameter gear 23 can be seen. By thus fitting and holding the small diameter gear 24 in the circular hole 42 of the assembling jig 31, the small diameter gear 24 can be protected by the assembling jig 31.

The assembling jig 31 shown in FIG. 6 constitutes the assembling jig 31 according to the invention described in claim 3, and has three elongated holes 51 into which the small diameter gear 24 is fitted. The holding arms 52 and the holding pinion 53 projecting forward from the center where these arms 52 intersect in the assembling direction are integrally formed. The holding pinion 53 has teeth equivalent to those of the output pinion 21, and the large diameter gear 2
3 mesh. Further, the holding arm 52 biases the small diameter gear 24 toward the holding pinion 53 side in a state where the small diameter gear 24 is fitted in the long hole 51 and the large diameter gear 23 is meshed with the holding pinion 53. It is formed with a length. In the assembling jig 31, the holding arm 52 is formed on the side of the small-diameter gear 24 so as to overlap with the large-diameter gear 23 when viewed in the axial direction. Since there is no protruding portion, it can be formed in a small size.

The assembling jig 31 shown in FIGS. 7 and 8 is
Each two-stage gear 22 is held by a columnar support shaft 61 formed in a triangular shape and projecting from each triangular top. The assembling jig 31 constitutes the assembling jig 31 according to the invention described in claim 3. The support shaft 61 has a two-stage gear 22.
It is formed so as to be slightly thicker than the shaft hole 27, and holds the two-stage gear 22 by the elastic force (pressing force in the radial expansion direction) generated when the shaft hole 27 is fitted. The distance between the support shafts 61 is set to be the same as that of the fixed shaft 28 on the motor housing 7 side.

Further, in this assembling jig 31, a triangular hole 62 is formed in the center so that the meshing portion of the output pinion 21 and the large-diameter gear 23 can be seen. The hole 62 is formed so that a corner 62a is directed to the axis of the support shaft 61. By forming the holes 62 in this manner, all the two-stage gears 22 can be formed by aligning the phase matching mark 29 of the two-stage gear 22 with the corner 62a.
Since the phases can be matched, the assembly jig 31
It is not necessary to provide a mark on the side.

In the assembling jig 31 thus formed, by holding the two-stage gear 22 on the support shaft 61, the two-stage gear 22 is in the same state as when assembled on the fixed shaft 28. . That is, since all the two-stage gears 22 can be held so as to be in the same state as the assembled state before being assembled, the two-stage gears 22 can be positioned more accurately when assembled.

Further, the assembling jig 31 includes a support shaft 61.
As shown in FIG. 8, the connecting portion 63 between the large-diameter gears 2 is
It is projected to the 3 side, and the small diameter gear 24
Form teeth 64 that mesh with each other. 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 two-stage gear 22 is transported or stored with the assembling jig 31 holding the two-stage gear 22. There is no.

[0034]

As described above, according to the present invention, it is possible to assemble a plurality of two-stage gears on the assembled side at once.
Further, since the phases of the respective two-stage gears can be matched with each other while the holding means holds the two-stage gears, the alignment becomes easier as compared with the case where the marks are aligned while being assembled. Therefore, by using the jig for assembling the two-stage gear according to the present invention, a plurality of two-stage gears can be assembled accurately in a short time. Even if the pinion and the two-stage gear on the assembled side are helical gears, the phases of all the two-stage gears can be reliably matched, and the number of steps can be reduced and erroneous assembly can be prevented. .

According to the second aspect of the present invention, the gear part fitted in the hole of the holding means is protected by the holding means, so that the gear part is damaged during contact with other members during transportation or during storage. Can be prevented.

According to the third aspect of the present invention, the holding arm can be formed laterally of the small diameter gear so as to overlap the large diameter gear when viewed in the axial direction. It is possible to form a small jig for assembling a two-stage gear without protruding to the outside.

According to the fourth aspect of the invention, since all the two-stage gears can be held so as to be in the same state as the assembled state before they are assembled, the two-stage gears can be positioned more accurately during the assembling. You can

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a power unit for an electric assisted bicycle that incorporates a two-stage gear with a two-stage gear incorporating jig according to the present invention.

FIG. 2 is a cross-sectional view showing a state immediately before assembling a two-stage gear.

FIG. 3 is a diagram showing an assembled state of a two-stage gear.

FIG. 4 is a view showing a jig for assembling a two-stage gear 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 sectional view taken along line VIII-VIII in FIG.

[Explanation of symbols]

7 ... Motor housing, 21 ... Output pinion, 22 ... Two-step gear, 23 ... Large diameter gear, 24 ... Small diameter gear, 27 ... Shaft hole, 28 ... Fixed shaft, 29, 34 ... Mark, 31 ... Assembly jig , 32 ... Holding plate, 42 ... Circular hole, 51 ... Oblong hole, 52
... holding arm, 53 ... holding pinion, 61 ... spindle.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Satoshi Makino             Yamaha Motor, 2500 Shinkai, Iwata, Shizuoka Prefecture             Within the corporation F-term (reference) 3C030 CA00                 3J027 FA18 FB05 GA01 GB06 GC13                       GC22 GD04 GD07 GD13 GE14                       GE18 GE30                 3J063 AA06 AB12 AC01 BA01 CA01                       CB04 XA10

Claims (4)

[Claims] 1. A large-diameter gear and a small-diameter gear are arranged side by side on the same axis line to hold a plurality of two-stage gears integrally formed, and the phases of all the two-stage gears are made to coincide with each other, and each large-diameter gear is assembled. Is a jig for assembling a gear to be engaged with the pinion on the side, which is formed of a flexible material and holds all the two-stage gears detachably by its elasticity, and the rotation of each two-stage gear. A jig for assembling a two-stage gear, which comprises a phase-matching means for aligning the marks indicating the reference positions in the directions to match the phases of all the two-stage gears. 2. The two-stage gear assembling jig according to claim 1, wherein the holding means has a structure for holding the two-stage gear by inserting the gear portion of each two-stage gear into a hole. Assembling jig. 3. The jig for assembling a two-step gear according to claim 1, wherein the holding means has a holding pinion formed in substantially the same shape as the pinion, and the large-diameter gears of all the two-step gears mesh with each other.
A jig for assembling a two-stage gear, comprising a holding arm for each two-stage gear that urges the small-diameter gear in the direction in which the holding pinion is located. 4. 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 in the shaft hole of each two-stage gear. Gear assembly jig.