JP2900173B2 - Roller synchro mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Object of the Invention (1) Field of the Invention The present invention relates to a synchronizing mechanism used in a multi-stage transmission, and more particularly, to a gear rotatably supported on an input shaft or an output shaft. The present invention relates to a roller synchronization mechanism for fastening the shaft to each other via a roller.

(2) Prior Art Conventionally, as such a roller synchronization mechanism, US Pat.
No. 4,817,451 is known.

In this roller synchronization mechanism, a plurality of rollers are arranged between a roller contact surface formed on an inner periphery of a gear rotatably supported on a rotating shaft and a cam groove formed on an outer periphery of an inner cam fixed to the rotating shaft. The roller has a structure in which a dowel formed in a sleeve is disengaged from a dowel-entering groove formed in a side portion of a retainer for holding the roller slightly movably in a radial direction. In a state where the dowel of the sleeve is engaged with the dowel entry groove of the retainer, the roller engages with the cam groove of the inner cam and moves radially inward, whereby the roller abuts the roller contact surface formed on the gear. , And the connection between the rotating shaft and the gear is released. On the other hand, in a state in which the dowel of the sleeve is separated from the dowel-entering groove of the retainer, the roller is pressed by the cam groove of the inner cam and is pushed outward in the radial direction. As a result, the roller is pressed against the roller contact surface and the rotating shaft is rotated. And the gear are integrally fastened.

(3) Problems to be Solved by the Invention However, in the above-mentioned conventional roller synchro mechanism, since the dowel entry groove of the retainer and the roller holding hole are arranged side by side in the axial direction, the thickness of the retainer increases and the roller There is a disadvantage that the axial size of the entire synchronization mechanism is increased.
In addition, since the inner cam, rollers and retainer are housed in the protrusions formed on the side surfaces of the gear, the gear thickness increases, which also increases the axial dimension of the entire roller synchronization mechanism. ing.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to reduce the axial dimension of a roller synchro mechanism and reduce the size thereof.

B. Configuration of the Invention (1) Means for Solving the Problems In order to achieve the above object, the present invention provides a gear which is rotatably supported on a rotating shaft and has a roller contact surface formed on an inner periphery thereof, An inner cam fixed to the rotating shaft and having a plurality of cam grooves formed on an outer periphery thereof and facing the roller contact surface; and a plurality of inner grooves arranged between the cam groove of the inner cam and the roller contact surface of the gear. A roller, a retainer having the roller slightly movably held in the radial direction and having a dowel entry groove formed on a side surface thereof; and a dowel entry groove supported by the rotation shaft so as to be relatively non-rotatable and axially movable. A sleeve formed with a dowel which can be freely engaged and disengaged from the retainer. By detaching the dowel of the sleeve from the dowel entry groove of the retainer, the roller is pushed out radially outward by the cam groove of the inner cam to thereby release the roller of the gear. A first feature of the roller synchro mechanism that presses against the contact surface to thereby integrally fasten the rotating shaft and the gear, wherein the dowel-entering groove of the retainer is formed between adjacent rollers held by the retainer. I do.

In addition, the present invention is supported by the rotation shaft to be relatively rotatable,
A gear formed with an inner peripheral roller contact surface, an inner cam fixed to the rotating shaft and formed with a plurality of cam grooves on the outer periphery opposed to the roller contact surface, and a cam groove of the inner cam and the gear. A plurality of rollers disposed between the roller contact surfaces, a retainer having a roller that is slightly movably held in the radial direction, and a dowel-entrance groove formed on a side surface thereof; A sleeve formed so as to be freely movable in the axial direction and formed with a dowel that is detachable from the dowel-entering groove.The sleeve is detached from the dowel-entering groove of the retainer. In the roller synchro mechanism for extruding radially outward and pressing against the roller contact surface of the gear to thereby integrally fasten the rotating shaft and the gear, the inner cam,
A second feature is that at least a part of the roller and the retainer are disposed in a concave portion formed inside the gear.

(2) Operation According to the first feature described above, the dowel entry groove of the retainer is formed between the adjacent rollers held by the retainer, so that the thickness of the retainer is reduced to the minimum necessary for holding the roller. The thickness of the roller can be formed within the range of the thickness, so that the axial size of the roller synchro mechanism is reduced.

According to the second feature of the present invention, the inner cam,
Since at least a part of the roller and the retainer are disposed in the concave portion formed inside the gear, the inner cam,
There is no need to form a protrusion for accommodating the roller and the retainer on the side surface of the gear, and as a result, the axial size of the roller synchronization mechanism is reduced.

(3) Example Hereinafter, an example of the present invention will be described with reference to the drawings.

1 to 4 show a first embodiment of the present invention.
FIG. 1 shows the roller synchronization mechanism of FIG.
2 is a sectional view taken along the line II-II of FIG. 1, FIG. 3 is a sectional view taken along the line III-III of FIG. 1, and FIG. 4 is a perspective view of the retainer.

As shown in FIG. 1, a gear 3a of a first speed stage is rotatably supported on a rotating shaft 1 constituting an input shaft or an output shaft of a multi-stage transmission via a needle bearing 2a. At a position axially separated from the gear 3a by a predetermined distance, the gear 3b of the second speed stage is also placed on the collar 4 which is engaged with the rotary shaft 1 via the needle bearing 2b.
Are rotatably supported relative to each other. Between the gears 3a and 3b, a sleeve 8 is supported on the outer periphery of a boss 6 connected to the rotating shaft 1 by a spline 5 via a spline 7 so as to be slidable in the axial direction. By moving the gear 3a in the axial direction with the fork 9, the gear 3a in the first gear or the gear 3b in the second gear is integrally fastened to the rotary shaft 1 to establish the gear.

2, a ring-shaped inner cam 10a is fixed to the rotary shaft 1 via a spline 11a between the gear 3a at the first speed and the boss 6. It is formed a number of cam grooves 10a ₁ forming the chevron outer periphery of the inner cam 10a. Then, the cam grooves 10a ₁ of the inner cam 10a, between the roller abutment surface 3a ₂ which is formed on the inner periphery of said gear projecting portion 3a is provided on one side of 3a _1, a plurality of rollers 12a are distribution Has been established.

FIGS. 3 and 4 as apparent Referring also to FIG., Between the protruding portions 3a ₁ of the inner cam 10a and the gear 3a is
A ring-shaped retainer 13a whose outer periphery is in sliding contact relatively rotatably to the roller abutment surface 3a ₂ of the gear 3a is敢合, axial stopper is applied with a clip 15a via the control ring 14a. A plurality of roller support holes 13a in the retainer 13a penetrating in the radial direction corresponding to the position of the cam groove 10a _{1 1}
The roller 12a is held inside the roller 12a so as to be slightly movable in the radial direction. Then, the inner periphery of the retainer 13a, the dowel ingress grooves 13a ₂ and extending in the axial direction and open on one side are formed three by 120 ° intervals. As best shown in FIG. 3, the dowel entry groove 13a ₂
It is formed so as to be positioned adjacent the roller support hole 13a ₁ intermediate, thereby there is a minimum thickness necessary to axial thickness of the retainer 13a holds the rollers 12a.

On the other hand, a dowel 8a protrudes from one side of the sleeve 8. By moving the sleeve 8 in the axial direction through the spline 7, the dowel 8a is detached from the dowel entry groove 13a _{2 of the} retainer 13a. I do. When the dowels 8a are in engagement with the dowel ingress grooves 13a _2, the inner cam 10a and the retainer 13a are positioned in the state shown in FIG. 2, the roller 12a is敢合the center of the cam grooves 10a _1.

Since the roller synchronization mechanism at the second speed stage has the same structure as that of the roller synchronization mechanism at the first speed stage, the same reference numerals are added to the reference numerals to omit redundant description. I do.

Next, the operation of the first embodiment of the present invention having the above-described configuration will be described.

The sleeve 8 is in the neutral position shown in FIG.
When the inner cam 10a and the retainer 13a are engaged with the dowel entry groove 13a ₂ of the retainer 13a on the gear 3a side, the spline 11a, the rotating shaft 1, the spline 5, the boss 6, the spline 7, and the sleeve 8 dowel 8a , and the second through the dowel ingress grooves 13a ₂
It is positioned as shown in the figure. Then, the roller 12a held by the retainer 13a is moved radially inwardly in the interior of the roller support hole 13a _1, slightly spaced from the roller abutment surface 3a ₂ of the gear 3a. In this state, the outer peripheral surface of the retainer 13a and the gear 3
The roller contact surface 3a ₂ of a slips, and the transmission of torque between the rotating shaft 1 and the gear 3a is interrupted. At this time, the dowel 8a of the sleeve 8 also has敢合the dowel ingress grooves 13b ₂ of the gear 3b side of the retainer 13b, is also cut off transmission of torque between the rotary shaft 1 and the gear 3b.

When disengaging the dowel 8a from the dowel ingress grooves 13a ₂ the sleeve 8 from this state is moved in the arrow A direction, the retainer 13a
And the inner cam 10a can be slightly rotated relative to each other by the torque applied from the rotating shaft 1 or the gear 3a.
roller 12a by the cam grooves 10a ₁ a is pushed strongly radially outwardly within the roller support hole 13a _1, it is pressed against the roller abutment surface 3a ₂ of the gear 3a. Thereby, the inner cam 10a and the gear 3a, that is, the rotating shaft 1 and the gear 3a are integrally fastened,
The first gear is established. Conversely, when the sleeve 8 is moved in the direction of arrow B, the rotation shaft 1 is operated in the same manner as described above.
And the gear 3b are integrally fastened to establish the second shift speed.

3 and FIG. 6 (conventional example), it is apparent that the dowel entry grooves 13a ₂ ′ and 13b ₂ ′ of the conventional researches 13a ′ and 13b ′ are formed by rollers 12a ′ and 12b ′. Of the dowels 13a ₂ , 13a of the present invention.
Since b ₂ is formed between the roller support holes 13a _1, 13b ₁ adjacent in the circumferential direction, it is possible to the retainer 13a, the axial thickness of the 13b minimum necessary, resulting roller synchro mechanism Is reduced in size.

Next, a second embodiment of the present invention will be described with reference to FIG.

Gear 3a of this embodiment, the 3b, an annular recess 3a _3, 3b ₃ are formed on opposite sides thereof, the inner cam 10a,
10b and rollers 12a, retainer 13a holding the 12b, 13b is housed in the recess 3a _3, 3b ₃ formed in the gear 3a, 3b. At this time, since the inner cams 10a and 10b cannot be directly connected to the rotating shaft 1 by splines,
The inner cams 10a and 10b are formed integrally with the boss 6.

Thus, in this embodiment, the sleeve 8 is moved in the axial direction, and the dowels 8a, 8b are moved into the dowel entry grooves 13 of the retainers 13a, 13b.
By disengaging from a _2, 13b _2, can be selectively fastened first speed stage or the second gear of the gear 3a, and 3b to the rotation shaft 1. As is apparent from a comparison between FIG. 1 and FIG. 6, the gears 3a and 3b of the second embodiment have inner cams 10a and 10b and rollers 12a and 12b in recesses 3a ₃ and 3b ₃ formed therein. retainer 13a holding the, since the accommodating 13b, roller having the gear 3a, is possible to greatly reduce the axial thickness of the 3b can, adjacent the dowel ingress grooves 13a _2, 13b ₂
Along with the arrangement between 12a and 12b, the axial dimension of the roller synchronization mechanism can be further reduced.

As described above, the embodiments of the present invention have been described in detail. However, the present invention is not limited to the embodiments, and various small design changes may be made without departing from the present invention described in the claims. It is possible to do.

For example, in the embodiment, the roller synchro mechanism is provided between the first speed and the second speed, but may be provided at other speeds. In the second embodiment,
The same manner as in the first embodiment the retainer 13a, 13b of the roller 12a, it forms a dowel ingress groove 13a _2, 13b ₂ between 12b, the dowel ingress grooves 13a _2, 13b ₂ as usual rollers 12a, 12b of the A concave portion 3 formed on the axis and formed with inner cams 10a and 10b, rollers 12a and 12b, and retainers 13a and 13b inside gears 3a and 3b.
a _3, only by means disposed 3b ₃ it is also possible to reduce or shorten the axial dimension of the roller synchro mechanism.

C. Effects of the Invention As described above, according to the first feature of the present invention, the dowel entry groove of the retainer is formed between the adjacent rollers held by the retainer, so that the thickness of the retainer is held by the rollers. Even if the minimum thickness is required, the dowel groove can be formed within the range of the thickness. Therefore, the thickness of the retainer can be reduced as compared with the conventional one, and the axial dimension of the roller synchro mechanism is reduced.

According to the second feature of the present invention, the inner cam,
Since at least a part of the roller and the retainer are disposed in the concave portion formed inside the gear, the inner cam,
There is no need to form a protrusion for accommodating the roller and the retainer on the side surface of the gear. As a result, the thickness of the gear can be reduced as compared with the conventional gear, and the axial dimension of the roller synchronization mechanism is reduced.

[Brief description of the drawings]

1 to 4 show a first embodiment of the present invention. FIG. 1 is a sectional view taken along the line II of FIG. 2 showing the roller synchronization mechanism, and FIG. 2 is II of FIG. 3 is a sectional view taken along line III-III of FIG. 1, FIG. 4 is a perspective view of the retainer,
FIG. 5 shows a second embodiment of the present invention, and is a sectional view corresponding to FIG. 1, and FIG. 6 is a sectional view corresponding to FIG. 3 showing a conventional example. 1 ... rotary shaft, 3a, 3b ... gear, 3a _2, 3b ₂ ... roller contact surface, 3
a ₃ , 3b ₃ ... recess, 8 ... sleeve, 8a, 8b ... dowel, 10a, 10b ...
Inner cam, 10a ₁ , 10b ₁ … Cam groove, 12a, 12b… Roller,
13a, 13b ... retainer, 13a _2, 13b ₂ ... Dubbo entry groove

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Ken Mizokawa 1-4-1 Chuo, Wako-shi, Saitama Pref. Honda Research Laboratory Co., Ltd. (58) Field surveyed (Int. Cl. ⁶ , DB name) F16D 11 / 00-23/14 F16H 3/12

Claims (2)

(57) [Claims] 1. A rotary shaft (1) rotatably supported on a rotating shaft (1),
Gear forming a roller contact surface on the inner periphery _{(3a 2, 3b 2) (} 3a, 3
b) and a plurality of cam grooves (10a ₁ , 10a ₁ , 3b ₂ ) fixed to the rotating shaft (1) and facing the roller contact surfaces (3a ₂ , 3b ₂ ) on the outer periphery.
10b ₁ ), the inner cams (10a, 10b), the cam grooves (10a ₁ , 10b ₁ ) of the inner cams (10a, 10b), and the roller contact surfaces (3a ₂ , 3b) of the gears (3a, 3b). 3b ₂ ) and a plurality of rollers (12a, 12b)
a, with slightly movably retain 12b) in the radial direction, and a retainer forming a dowel ingress groove (13a _2, 13b ₂₎ on its side surface (13a, 13b), relative rotation to the rotary shaft (1) Impossible to move in the axial direction,
a ₂ , 13b ₂ ) and a sleeve (8) formed with a detachable dowel (8a, 8b), and a dowel (8a, 8) of this sleeve (8) is provided.
b) is replaced with dowel entry grooves (13a ₂ , 13a) of the retainers (13a, 13b).
b ₂ ), the inner cam (10a, 10a
cam groove of _{b) (10a 1, 10b 1} ) by rollers (12a, 12b) the roller contact surface of the extruded radially outward gear (3a, 3b) (3
a ₂ , 3b ₂ ) so that the rotating shaft (1) and the gear (3a, 3b)
In the roller synchro mechanism for integrally fastening b), the dowel entry grooves (13a ₂ , 13b ₂ ) of the retainers (13a, 13b) are provided.
Is formed between the adjacent rollers (12a, 12b) held by the retainers (13a, 13b). 2. A rotary shaft (1) rotatably supported on a rotating shaft (1),
Gear forming a roller contact surface on the inner periphery _{(3a 2, 3b 2) (} 3a, 3
b) and a plurality of cam grooves (10a ₁ , 10a ₁ , 3b ₂ ) fixed to the rotating shaft (1) and facing the roller contact surfaces (3a ₂ , 3b ₂ ) on the outer periphery.
10b ₁ ), the inner cams (10a, 10b), the cam grooves (10a ₁ , 10b ₁ ) of the inner cams (10a, 10b), and the roller contact surfaces (3a ₂ , 3b) of the gears (3a, 3b). 3b ₂ ) and a plurality of rollers (12a, 12b)
a, with slightly movably retain 12b) in the radial direction, and a retainer forming a dowel ingress groove (13a _2, 13b ₂₎ on its side surface (13a, 13b), relative rotation to the rotary shaft (1) Impossible to move in the axial direction,
a ₂ , 13b ₂ ) and a sleeve (8) formed with a detachable dowel (8a, 8b), and a dowel (8a, 8) of this sleeve (8) is provided.
b) is replaced with dowel entry grooves (13a ₂ , 13a) of the retainers (13a, 13b).
b ₂ ), the inner cam (10a, 10a
cam groove of _{b) (10a 1, 10b 1} ) by rollers (12a, 12b) the roller contact surface of the extruded radially outward gear (3a, 3b) (3
a ₂ , 3b ₂ ) so that the rotating shaft (1) and the gear (3a, 3b)
b), wherein at least a part of the inner cam (10a, 10b), the roller (12a, 12b), and the retainer (13a, 13b) are formed inside the gear (3a, 3b). characterized in that disposed in the recess (3a _3, 3b ₃₎ formed in the roller synchro mechanism.