JP3875764B2 - Support structure of driven gear in rotary take-out device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention can easily and quickly mount a gear mechanism portion for transmitting the rotational speed from a wheel to a speedometer such as a two-wheeled vehicle at a predetermined position in the housing, and improves the assembly work efficiency. The present invention relates to a rotation extraction device that can minimize the number of points.
[0002]
[Prior art]
In a speedometer such as a two-wheeled vehicle, a rotation take-out device for detecting the speed from the rotation of a wheel mainly includes a drive gear interlocked with a wheel main shaft of a hub, a driven gear that meshes with the drive gear and transmits the rotation to a cable member. It is comprised from the gear mechanism by this combination. A wire cable is connected between the gear mechanism and the speedometer, and the rotational speed is transmitted to the speedometer via the wire cable.
[0003]
The wire cable is connected to the driven gear of the gear mechanism, and the rotational speed of the driven gear is transmitted to the wire cable, and the speed meter displays the speed. The driven gear and the driving gear are accommodated in a housing formed of a material made of aluminum alloy or synthetic resin. In general, the drive gear and the driven gear in the rotation transmission mechanism of such a speedometer are generally a combination of screw gears.
[0004]
[Problems to be solved by the invention]
In a rotation take-out device provided with a gear mechanism using a drive gear and a driven gear, a cable connecting shaft for connecting a cable material c for transmitting rotational motion is integrally formed on the driven gear, and the driven gear is connected to the housing in the housing. It is installed at a predetermined location. As the mounting structure, a bearing bush b processed with high precision is mounted in a mounting hole h in the housing, and the cable connecting shaft portion of the driven gear w is pivotally supported by the bearing bush b. It can rotate freely in the circumferential direction (see FIG. 6A).
[0005]
Accordingly, extremely high machining accuracy is required on the inner peripheral surface of the housing mounting hole h, the inner and outer peripheral surfaces of the bearing bush b, and the outer periphery of the shaft support portion of the driven gear w (such as the outer peripheral surface of the cable connecting shaft). Along with that, high assembly accuracy is also required. Accordingly, since a high level of work technology is required for workers, the product cost is inevitably high.
[0006]
In addition, the operation of mounting the driven gear w in the housing is a mechanism in which the driven gear w is inserted from the opening of the mounting hole h of the housing into the housing inner surface along the central axis. Therefore, in order to avoid unnecessary interference between the driven gear w and the mounting hole h and to allow the driven gear w to be smoothly inserted into the mounting hole h, the inner diameter of the mounting hole h is It is larger than the outer diameter of the tooth portion of the driven gear w, so that the inner diameter of the mounting hole h has a margin.
[0007]
Therefore, when the driven gear w is loosely inserted into the mounting hole h, the driven gear w in the mounting hole h having a large inner diameter is arranged in the axial direction of the mounting hole h as shown in FIG. As a result, it is difficult and troublesome to insert the support shaft at the tip of the driven gear w into the housing by inserting the support shaft at the tip of the support hole h ₁ provided in the bottom of the mounting hole h. The work efficiency is poor, and its improvement is desired.
[0008]
[Means for Solving the Problems]
Therefore, the inventors have intensively and researched to solve the above-mentioned problems, and as a result, the present invention is a drive gear that is rotationally driven by the rotation of wheels. And a driven gear that rotates in mesh with the drive gear And a drive device that has a boss portion at a wheel center position of the housing and is rotatably mounted on the boss portion, and a drive gear. A toothed portion meshing with the toothed portion, a circular shafted portion formed at one end in the axial length direction of the toothed portion with an equal or greater outer diameter, a rotation support end portion formed at the other end of the toothed portion in the axial length direction, and the circular shape A driven gear for connecting a transmission cable material, comprising a cable connecting shaft formed on the opposite side of the shaft portion from the tooth portion forming side. A gear storage chamber formed on the inner surface side of the housing, a communication opening formed in communication with the inner side of the gear storage chamber from the housing outer surface side, and a circular shaft portion of the driven gear in the vicinity of the communication opening A tubular body in which a bearing portion that rotatably supports a shaft and an intermediate conduit portion having an inner diameter larger than the bearing portion is formed A shaft end receiving portion that faces the communication opening in the gear housing chamber in the axial direction and supports the shaft end of the driven gear; and the tubular body The circular shaft portion is slidably supported by the bearing portion and guided in the axial length direction, and the tip of the driven gear moves to the position of the shaft end receiving portion. In the rotary take-out device, the presser member is formed with a through hole formed in the center so that the cable connecting shaft is inserted in a non-contact manner, and the presser member is fixed to the intermediate pipe portion. With the support structure of the driven gear, the gear mechanism for transmitting the rotation speed can be easily and quickly mounted at a predetermined position in the housing, improving the assembly work efficiency and minimizing the number of parts. The above-mentioned problems are solved.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 5A, the rotation take-out device is attached to a hub on the front wheel side of a motorcycle (which may be a tricycle or a four-wheel vehicle). FIG. 5B is an enlarged view thereof. The housing A also serves as a drum case of a brake device in which a brake shoe is mounted.
[0010]
The rotation take-out device mainly comprises a housing A, a drive gear G ₁ , a driven gear G _{2 and the} like [see FIGS. 1 (A) and (B)]. The housing A is formed of an aluminum die alloy or a synthetic resin, and the housing 1 of the housing A has a disk shape, and a gear housing chamber 2 is formed at a central portion on the inner surface side. The gear housing chamber 2 is surrounded by a cylindrical partition wall 2a, and a boss portion 2b is formed at the center of the gear housing chamber 2 (see FIGS. 1A and 2A). .
[0011]
A tubular body A ₁ is provided on the outer surface side of the housing A. The tubular body A ₁ is formed in a hollow tubular shape, and is formed in a pipe shape having a circular cross section along the central axis between the outside of the housing A and the gear housing chamber 2 in the housing A, which will be described later. the driven gear G ₂ and the mounting opening for mounting the gear housing chamber 2, and further is used for the purpose of protecting from the outside base of the cable after installation.
[0012]
Specifically, the tubular body A ₁ is integrally formed on the outer surface side of the housing A, one end in the longitudinal direction slightly protrudes from the outer periphery of the housing A, and the other end side reaches the vicinity of the center of the housing A. And ends the tubular body A ₁ at a position eccentric from the center of the housing A. As described above, the tubular body A ₁ communicates the outside of the housing A with the gear storage chamber 2, and the opening on the gear storage chamber 2 side is referred to as a communication opening 3. Driven gear G ₂ to be described later is exposed from the communication opening portion 3 in the gear receiving chamber 2, has a structure which engages with the drive gear G ₁ to be described later [see FIG. 2 (C)].
[0013]
The circular inner peripheral surface in the vicinity of the communication opening 3 side of the tubular body A ₁ is a bearing portion 4 and rotatably supports the cylindrical shaft portion of the driven gear G ₂ . Further, an intermediate pipe portion 5 for a pressing member 14 having an inner diameter slightly wider than the inner diameter of the bearing portion 4 is formed on the outer side of the bearing portion 4 along the central axis direction through a step portion. Further, an outer pipe section 6 having an inner diameter slightly wider than the inner diameter of the intermediate pipe section 5 is formed outside the intermediate pipe section 5 along the central axis direction. The bearing unit 4, the intermediate pipe section 5 and the outer pipe section 6 has the same central axis line L _A -L _A [see FIG. 3 (A)].
[0014]
In the gear housing chamber 2 of the housing A, a shaft end receiving portion 7 is formed at a position facing the central axis of the communication opening 3 [FIGS. 1A, 1B, and 3]. See A)]. The shaft end receiving portion 7 is formed to bulge from the bottom surface of the gear housing chamber 2, and a support hole 7 a is formed in the shaft end receiving portion 7, and an axial length of a driven gear G ₂ described later. The direction end is rotatably supported.
[0015]
In a gear mechanism comprising a drive gear G ₁ and a driven gear G ₂ housed in the gear housing chamber 2, the drive gear G ₁ has a tooth portion 8 a formed around a ring-shaped cylindrical portion 8 and has an axial length. A protruding plate 8b is formed outward from the circumferential end at one end of the direction (see FIG. 1A). The drive gear G ₁ is made of a synthetic resin or a metal material.
[0016]
Next, as shown in FIGS. 1 (A), 1 (B) and FIGS. 3 (A), (B), etc., the driven gear G ₂ is formed in a shaft length with a small diameter, and the tooth portion 10 and the circular shaft portion. 11 and a rotation support end portion 12, a circular shaft portion 11 is formed on one end side in the axial length direction of the tooth portion 10, and a rotation support end portion 12 is formed on the other end side in the axial length direction of the tooth portion 10. It has been done. Further, a cable connecting shaft 13 is formed from one end of the circular shaft portion 11 in the axial length direction (the side opposite to the side on which the tooth portion 10 is formed). The cable connecting shaft 13 is connected with a transmission cable member 15 for transmitting the rotational speed to the speedometer. The driven gear G ₂ is made of a synthetic resin or a metal material.
[0017]
The outer diameter of the circular shaft portion 11 is formed larger than the outer diameter of the tooth portion 10. Further, the circular shaft portion 11 and the tooth portion 10 may have the same outer diameter, that is, the outer diameter of the circular shaft portion 11 is equal to or larger than the outer diameter of the tooth portion 10. Specifically, as shown in FIG. 3 (A), the outer diameter of the teeth 10 and D _10, outside of the outer diameter of the circular shaft portion 11 when the D _11, the teeth 10 and the circular shaft portion 11 The diameter has a relationship of D ₁₀ ≦ D ₁₁ . FIG. 3A shows the driven gear G ₂ of the embodiment in which the outer diameter of the circular shaft portion 11 is larger than the outer diameter of the tooth portion 10 (D ₁₀ <D ₁₁ ). 4 (A) and 4 (B), the driven gear G ₂ of the embodiment is the same as the outer diameter of the circular shaft portion 11 and the outer diameter of the tooth portion 10 (D ₁₀ = D ₁₁ ).
[0018]
As the driven gear G ₂ is, inserted from the outer conduit 6 of the tubular body A _1, a state in which the circular shaft portion 11 of the driven gear G ₂ is rotatably supported by the bearing portion 4 of the tubular body A ₁ . Is set so as to smoothly rotate relative to the inner diameter D ₄ of the outer diameter D ₁₁ and the bearing portion 4 of the circular shaft portion 11 [see FIG. 3 (A)]. The rotation support end portion 12 is inserted into the supporting hole 7a of the shaft end receiving portion 7 formed in the gear accommodating chamber 2, the tooth portions 10 is exposed at the gear housing chamber 2, the teeth of the driving gear G ₁ It is set so as to engage with 8a. A tooth portion 8a of the driving gear G _1, as the embodiment of the teeth 10 of the driven gear G _2, and various gear transmission mechanism such as a screw gear or the screw gear (combined by warm Hoirugiya).
[0019]
In the showed embodiment is integrally molded with the teeth 10 and the circular shaft portion 11 and the cable connecting shaft 13 of the driven gear G _2, but not limited to the embodiment, for example, teeth 10, circular The shaft portion 11 and the cable connecting shaft 13 may be made of different members.
[0020]
Specific examples of the material of the driven gear G _2, when forming a synthetic resin, using polyacetal. In this embodiment, the rotary take-out device incorporated in the housing of the mechanical drum brake is shown, but it is needless to say that only the rotary take-out device has the same structure in the housing. The bearing portion 4 formed in the tubular body A ₁ of the housing and the circular shaft portion 11 of the driven gear G ₂ are cut so as to be able to rotate smoothly.
[0021]
Further, the presser member 14 is inserted into the intermediate pipe line portion 5 so that the driven gear G ₂ housed in the tubular body A ₁ does not fall off. The pressing member 14 has a ring shape, and a through hole 14a is formed at the center. The through hole 14a is intended that the cable connecting shaft 13 is loosely inserted, and the outer diameter D ₁₃ of the cable connecting shaft 13, an inner diameter of the to the D ₁₃ <D ₁₄ the relationship between D ₁₄ of the through hole 14a is present (See FIG. 3A).
[0022]
Further, the pressing member 14 may be fixed to the inside of the intermediate conduit portion 5 by press fitting, or may be fixed using an adhesive. The pressing member 14 may use a collar, a bush (supporting the rotation transmission shaft portion in a loose state), a ring member (circlip, snap ring) or the like.
[0023]
【The invention's effect】
The invention of claim 1 includes a drive gear G _{1 that} is driven to rotate by the rotation of a wheel, a gear mechanism that is driven by a driven gear G ₂ that is engaged with the drive gear G _1, and a housing A that includes the gear mechanism. In the rotary take-out device, the drive gear G ₁ having a boss portion 2b at the wheel center position of the housing A and rotatably mounted on the boss portion 2b, and a tooth portion 10 meshing with the drive gear G ₁ , A circular shaft portion 11 formed at one end in the axial length direction of the tooth portion 10 with an equal or larger outer diameter, a rotation support end portion 12 formed at the other end in the axial length direction of the tooth portion 10, and the circular shaft portion 11, a driven gear G ₂ comprising a cable connecting shaft 13 formed on the opposite side of the tooth portion 10 from the side where the tooth portion 10 is formed, and a gear housing chamber 2 formed on the inner surface side of the housing A. , Gear housing from the outer surface side of the housing A From the communication opening 3 formed to communicate with the inner side of the chamber 2, the bearing 4 that rotatably supports the circular shaft 11 of the driven gear G _{2 in} the vicinity of the communication opening 3, and the bearing 4 A tubular body A ₁ having an intermediate pipe section 5 having a larger inner diameter, and the communication opening 3 facing the communication opening 3 in the gear housing chamber 2 in the axial direction, and the shaft end of the driven gear G ₂ is a shaft end receiving portion 7 for supporting, together consisting pressing member 14 for fixing the driven gear G ₂ in the thrust direction in the tubular body a _1, the circular shaft portion 11 is slidably supported by the bearing portion 4 axes The distal end of the driven gear G ₂ is movable to the position of the shaft end receiving portion 7 while being guided in the longitudinal direction, and the presser member 14 is formed with a through hole 14a in which the cable connecting shaft 13 is loosely inserted without contact. And the presser member 14 is fixed to the intermediate pipe part 5. By the support structure of the driven gear in the output device, it is possible to minimize the number of parts, it is possible to reduce the machining position, the gear mechanism according to the driving gear G ₁ and the driven gear G ₂ and the housing The assembly work can be made extremely simple, and the work efficiency can be improved as compared with the conventional one.
[0024]
More specifically, the circular shaft portion 11 of the driven gear G ₂ is directly and rotatably supported by the bearing portion 4 of the tubular body A ₁ , so that the conventional effect is provided between the driven gear G ₂ and the bearing portion 4. it can be of without preparing a separate member of the bearing bush, as seen in the main structure, supporting the driven gear G ₂ at an extremely simple structure.
[0025]
Therefore, as seen in the prior art, the bearing bush has been required to be processed precisely in consideration of the dimensional tolerance between the driven gear and the bearing portion on the outer and inner surfaces. Then, the bearing portion 4 of the tubular body A ₁ can be used as the sliding support surface of the circular shaft portion 11 of the driven gear G ₂ as it is in the hole processing for press-fitting the bearing bush. This eliminates the need for a bearing bush, and can reduce expensive parts such as a bearing bush that has been machined with high precision without increasing the machining range compared to the prior art, thus reducing the overall product cost. I can do it.
[0026]
The driven gear G ₂ is inserted from the outer opening of the tubular body A ₁ , sent into the gear housing chamber 2 through the communication opening 3, and mounted in a predetermined state. The circular shaft portion 11 of the driven gear G ₂ is attached. Is equal to or larger than the outer diameter of the tooth portion 10, and the bearing portion 4 in the vicinity of the communication opening 3 is configured to rotatably support the circular shaft portion 11. Center or, will be matched with the axial center line of the circular shaft portion 11 of the tubular body center axis of A ₁ of the bearing portion 4 L _A -L _A and the driven gear G _2, the driven gear G ₂ is the bearing portion 4 kill be moved according to the axis line L _A -L _A.
[0027]
Therefore, the tooth portion 10 of the driven gear G ₂ can easily pass through the bearing portion 4, and the circular shaft portion 11 is guided in the axial length direction while being slidably supported by the bearing portion 4. In the operation of mounting G ₂ in the gear housing chamber 2, the tip of the driven gear G ₂ is accurately moved to the position of the shaft end receiving portion 7 without being inclined with respect to the axial direction in the middle, and it is easy and efficient. manner it is possible to mount the driven gear G _2, it is possible to improve the assemblability [refer to FIG. 3 (B)].
[0028]
Further, the presser member 14 is formed such that the inner diameter of the through hole 14a is larger than the outer diameter of the cable connecting shaft 13, so that the cable connecting shaft 13 is loosely inserted into the through hole 14a. However, the through hole 14a of the pressing member 14 only surrounds the periphery of the cable connecting shaft 13 and is not in contact therewith. Therefore, it takes lateral loads by the cable connecting shaft 13 slightly with little contact with the cable connecting shaft 13 as a bending deformation or the like occurs, a stable rotation state without a failure of the rotation of the driven gear G ₂ Can be secured.
[0029]
Incidentally, this is the pressing member 14 through hole 14a is formed, for the driven gear G ₂ directly, not to the bearing support, a normal state, a non-contact state by an appropriate gap is formed by a high-precision machining Since it is not a thing, it can be set as an inexpensive component.
[0030]
Next, the invention of claim 2, in claim 1, the outer diameter D ₁₁ of the circular shaft portion 11 of the driven gear G ₂ is driven gears in large consisting rotating take-off than the outer diameter D ₁₀ of the teeth 10 With the support structure, when the driven gear G ₂ is loosely inserted from the external opening of the tubular body A ₁ , the tooth portion 10 is interfered with the inner peripheral surface of the bearing portion 4 when passing through the bearing portion 4. And can pass smoothly.
[Brief description of the drawings]
FIG. 1A is an exploded perspective view showing the configuration of the present invention, FIG. 1B is an exploded perspective view including a cut-out portion showing the configuration of the main part of the present invention, and FIG. A perspective view (B) showing the accommodated state of the driven gear is a perspective view including a tubular body and a cut-out portion showing the accommodated state of the driven gear in the gear storage chamber location, and (C) is an accommodation of the tubular body and the driven gear in the gear storage chamber location. FIG. 3A is a driven gear, a sectional tubular body and an exploded configuration view showing a gear housing chamber, and FIG. 3B is a driven gear inserted along the central axis of the tubular body. FIG. 4A is a front view including a cut-out portion of a main part showing another embodiment of the present invention. FIG. 5B is a front view of a driven gear. FIG. The perspective view (B) of the front wheel part of the motorcycle using the invention is an enlarged view of the main part of (A). ) A front view including a cutting portion of a main part of a conventional type (B) is [EXPLANATION OF SYMBOLS] exploded front view including a cutting portion of a main part of a conventional type
A ... Housing A ₁ ... Tubular body G ₁ ... Drive gear G ₂ ... Driven gear 2 ... Gear housing chamber 2b ... Boss part 3 ... Communication opening part 5 ... Intermediate pipe part 7 ... Shaft end receiving part 10 ... Tooth part 11 ... Circular shaft 12 ... Rotation support end 14 ... Presser member

Claims (2)

Drive gear driven to rotate by wheel rotation And a driven gear that rotates in mesh with the drive gear And a drive device that has a boss portion at a wheel center position of the housing and is rotatably mounted on the boss portion, and a drive gear. A toothed portion meshing with the toothed portion, a circular shafted portion formed at one end in the axial length direction of the toothed portion with an equal or greater outer diameter, a rotation support end portion formed at the other end of the toothed portion in the axial length direction, and the circular shape A driven gear for connecting a transmission cable material, comprising a cable connecting shaft formed on the opposite side of the shaft portion from the tooth portion forming side. A gear storage chamber formed on the inner surface side of the housing, a communication opening formed in communication with the inner side of the gear storage chamber from the housing outer surface side, and a circular shaft portion of the driven gear in the vicinity of the communication opening A tubular body in which a bearing portion that rotatably supports a shaft and an intermediate conduit portion having an inner diameter larger than the bearing portion is formed A shaft end receiving portion that faces the communication opening in the gear housing chamber in the axial direction and supports the shaft end of the driven gear; and the tubular body The circular shaft portion is slidably supported by the bearing portion and guided in the axial length direction, and the tip of the driven gear moves to the position of the shaft end receiving portion. In the rotary take-out device , the presser member is formed with a through hole formed in the center so that the cable connecting shaft is inserted in a non-contact manner, and the presser member is fixed to the intermediate pipe portion . Support structure for driven gear.   2. The structure for supporting a driven gear in a rotary takeout device according to claim 1, wherein the outer diameter of the circular shaft portion of the driven gear is larger than the outer diameter of the tooth portion.

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