JPH0419A - Roller synchro mechanism - Google Patents

Abstract

PURPOSE:To shorten an axial dimension of a roller synchro mechanism, and make it compact by forming dowel admission channels of a retainer between rollers held by that retainer and adjacent to each other. CONSTITUTION:A ring retainer 13a, of which periphery slides in contact with a roller abutment surface 3a2 of a gear 3a freely to rotate relatively, is engaged between an inner cam 10a and a projection 3a1 of the gear 3a, and multiple roller supporting holes 13a1 passing through in the radial direction are formed in the retainer 13a so as to correspond to positiones of cam channels 10a1, and rollers 12a are held therein freely to move a little in the radial direction. Three dowel admission channels 13a2 opening in one side surface and extending in the axial direction are formed in the inner periphery of the retainer 13a with a space at 120 deg.. The dowel admission channels 13a2 are formed so as to be positioned at intermediate parts of roller supporting holes 13a1 adjacent to each other, and an axial thickness of the retainer 13a is thereby set at a required minimum for holding the rollers 12a.

Description

DETAILED DESCRIPTION OF THE INVENTION A0 Object of the Invention (1) Industrial Field of Application The present invention relates to a synchronizer mechanism used in a multi-stage transmission, and in particular, to a synchronizer mechanism used in a multi-stage transmission. The present invention relates to a roller synchronization mechanism that connects a shaft and a shaft to each other via a roller.

(2) Conventional technology Conventionally, as such a roller synchronizing mechanism, US Pat.
The one described in the specification of No. 817451 is known.

This roller synchronization mechanism has a plurality of rollers arranged between a roller contact surface formed on the inner periphery of a gear supported relatively rotatably on a rotating shaft and a cam groove formed on the outer periphery of an inner cam fixed to the rotating shaft. The sleeve has a structure in which a dowel formed on the sleeve is engaged with and disengaged from a dowel entry groove formed on the side of a retainer which holds the roller so as to be slightly movable in the radial direction. When the dowel of the sleeve is engaged with the dowel entry groove of the retainer, the roller fits into the cam groove of the inner cam and moves radially inward, thereby causing the roller to contact the roller contact surface formed on the gear. The rotation shaft and gear are disengaged from each other. On the other hand, when the dowel of the sleeve is detached from the dowel entry groove of the retainer, the roller is pressed by the cam groove of the inner cam and pushed outward in the radial direction.
As a result, the roller is pressed against the roller contact surface, and the rotating shaft and gear are fastened together.

(3) Problems to be Solved by the Invention However, in the conventional roller synchronizing mechanism described above, since the dowel entry groove of the retainer and the roller holding hole are arranged in parallel in the axial direction, the thickness of the retainer increases and the roller synchronization mechanism increases. There is a disadvantage that the axial dimension of the entire synchronizing mechanism becomes large. In addition, since the inner cam, rollers, and retainer are housed in the protrusion formed on the side of the gear, the thickness of the gear increases, which also causes the axial dimension of the entire race synchronization mechanism to increase. ing.

The present invention has been made in view of the above-mentioned circumstances, and it is an object of the present invention to shorten the axial dimension of a roller synchronizing mechanism and to make it more compact.

B0 Structure of the Invention (1) Means for Solving the Problems In order to achieve the above object, the present invention provides a gear that is relatively rotatably supported on a rotating shaft and has a roller contact surface formed on its inner periphery; An inner cam that is fixed to a rotating shaft and has a plurality of cam grooves formed on its outer periphery facing the roller contact surface, and a plurality of rollers that are disposed between the cam groove of the inner cam and the roller contact surface of the gear. a retainer that holds the roller so as to be slightly movable in the radial direction and has a dowel entry groove formed on its side surface; and a sleeve formed with a removable dowel, and by disengaging the dowel of the sleeve from the dowel entry groove of the retainer, the cam groove of the inner cam pushes the roller radially outward, and the roller contact surface of the gear A first feature of the roller synchronizing mechanism in which a rotating shaft and a gear are integrally fastened by pressing them against each other is that the dowel entry groove of the retainer is inserted between adjacent rollers held by the retainer.

The present invention also provides a gear that is relatively rotatably supported on a rotating shaft and has a roller contact surface formed on its inner periphery, and a plurality of cam grooves that are fixed to the rotating shaft and that face the roller contact surface on its outer periphery. an inner cam formed with an inner cam, a plurality of rollers disposed between the cam groove of the inner cam and the roller contact surface of the gear; A retainer having a dowel entry groove formed therein; and a sleeve supported by the rotating shaft so as to be non-rotatably movable in the axial direction and having a dowel formed therein that can be freely engaged with and detached from the dowel entry groove; In a roller synchronizing mechanism in which the roller is removed from the dowel entry groove of the inner cam, the cam groove of the inner cam pushes the roller radially outward and presses it against the roller contact surface of the gear, thereby fastening the rotating shaft and the gear together. the inner cam;
A second feature is that at least a portion of the roller and the retainer are disposed in a recess formed inside the gear.

(2) Effect According to the first feature described above, the dowel entry groove of the retainer is formed between adjacent rollers held by the retainer, so that the thickness of the retainer is reduced to the minimum required to hold the rollers. Even if the thickness is within the limit, the dowel entry groove can be formed within the thickness range, and as a result, the axial dimension of the roller synchronizer mechanism is shortened.

According to the second feature of the present invention, at least a portion of the inner cam, roller, and retainer are disposed in a recess formed inside the gear, so that the inner cam, roller, and retainer are accommodated. There is no need to form a protrusion on the side surface of the gear, resulting in a reduction in the axial dimension of the roller synchronizer mechanism.

(3) Examples Hereinafter, the present invention will be described in detail based on the drawings.

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

As shown in FIG. 1, a gear 3a of a first gear stage is relatively rotatably supported on a rotating shaft 1 constituting an input shaft or an output shaft of a multi-throw transmission via a needle bearing 2a. At a position axially spaced apart from the gear 3a by a predetermined distance, a second gear gear 3b is supported on the collar 4 fitted to the rotating shaft 1 via a second dollar bearing 2b so as to be relatively rotatable. There is. Both gears 3a.

3b, a sleeve 8 is connected to the outer periphery of the boss 6 connected to the rotating shaft 1 by a spline 5 via a spline 7.
is supported so as to be freely slidable in the axial direction, and by moving this sleeve 8 in the axial direction with a shift fork 9, the gear 3a of the first gear stage.

Alternatively, the gear 3b of the second gear is integrally fastened to the rotating shaft 1 to establish the gear.

As is clear from FIG. 2, a ring-shaped inner cam 10a is fixed to the rotating shaft 1 via a spline lla between the first gear gear 3a and the boss 6. A large number of mountain-shaped cam grooves 10a+ are formed on the outer periphery of the inner cam 10a. and,
A plurality of rollers 12a are arranged between the cam groove 102 of the inner cam 10a and a roller contact surface 3as formed on the inner circumference of the protrusion 3a+ provided on one side of the gear 3a. .

As is clear from FIG. 3 and FIG. 4, there is a space between the inner cam 10a and the protrusion 3a+ of the gear 3a, the outer periphery of which slides relative to the roller contact surface 3a2 of the gear 3a. A contacting ring-shaped retainer 13a is fitted, and removal in the axial direction is prevented by a clip 15a via a control ring 14a. A plurality of roller support holes 13a1 are formed in the retainer 13a to correspond to the positions of the cam grooves 10a1 and penetrate in the radial direction, and the rollers 12a are held inside thereof so as to be slightly movable in the radial direction. There is. The inner periphery of the retainer 13a is provided with a dowel entry groove 13 that is open on the side surface and extends in the axial direction.
Three a2 are formed at 120° intervals. As best shown in FIG. 3, the dowel entry groove 13a2 is formed to be located between adjacent roller support holes 13a+, so that the axial thickness of the retainer 13a is large enough to hold the roller 12a. The minimum thickness required for

On the other hand, a dowel 8a is protruded from one side of the sleeve 8, and by moving this sleeve 8 in the axial direction via the spline 7, the dowel 8a is moved to the retainer 13a.
from the dowel entry groove 13a2. And dowel 8a
When the inner cam 10a and the retainer 13a are positioned in the state shown in FIG. 2, the roller 12a is fitted into the center of the cam groove 102.

Since the roller synchronizer mechanism on the second gear side has the same structure and is substantially symmetrical to the roller synchro mechanism on the first gear side described above, duplicate explanations will be omitted by adding a suffix to the reference numeral. do.

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

When the sleeve 8 is in the neutral position shown in FIG.
a is the dowel entry groove 13a2 of the retainer 13a on the gear 3a side
In the fitted state, the inner cam 10a and the retainer 1
3a is a spline 1181 rotating shaft 1, a spline 5,
It is positioned as shown in FIG. 2 via the boss 6, the spline 7, the dowel 82 of the sleeve 8, and the dowel entry groove 13a2. Then, the roller 12 held by the retainer 13a
a moves radially inward inside the roller support hole 13a1 and is slightly separated from the roller contact surface 3a2 of the gear 3a. In this state, the outer peripheral surface of the retainer 13a and the roller contact surface 3as of the gear 3a slip, and the rotating shaft 1 and the gear 3a
Torque transmission between the two is cut off. At this time, sleeve 8
The dowel 8a also fits into the dowel entry groove 13b2 of the retainer 13b on the gear 3b side, and torque transmission between the rotating shaft 1 and the gear 3b is also interrupted.

When the sleeve 8 is moved in the direction of arrow A from this state and the dowel 8a is removed from the dowel entry groove 13a2, the retainer 13a and the inner cam 10a are connected to the rotating shaft 1 or the gear 3.
The roller 12a can be rotated slightly by the torque applied from the roller 12a by the cam groove 10a1 of the inner cam 10a.
is strongly pushed outward in the radial direction inside the roller support hole 13a1 and comes into pressure contact with the roller contact surface 3a2 of the gear 3a.

As a result, the inner cam 10a and the gear 32, that is, the rotating shaft 1 and the gear 3a, are coupled together, and the first gear stage is established. Conversely, when the sleeve 8 is moved in the direction of the arrow B, the rotary shaft 1 and the gear 3b are integrally fastened together to establish the second gear stage in the same manner as described above.

As is clear from a comparison between FIG. 3 and FIG. 6 (conventional example), the dowel entry grooves 13a2' and 13b2' of the retainer 13a13b' of the conventional one are in contact with the roller 12a'.
12b', whereas the dowel entry groove 13a213b2 of the present invention is formed between circumferentially adjacent roller support holes 132, 13b+.
The thickness of the retainers 132, 13b in the axial direction can be minimized, and as a result, the size of the roller synchronizing mechanism can be reduced.

Next, a second embodiment of the present invention will be described based on FIG.

The gears 32, 3b of this embodiment have annular recesses 3a2, 3bs formed on their opposing sides, and the retainers 132, 13b holding the inner cams 102, 10b and the rollers 122, 12b are connected to the gears 32, 3b. It is housed inside a recess 3a3°3bs formed in 3b. At this time, since the inner cams 102, 10b cannot be directly connected to the rotating shaft 1 by splines, the inner cams 102, 10b are formed integrally with the boss 6.

In this embodiment, by moving the sleeve 8 in the axial direction and disengaging the dowels 82, 8b from the dowel entry grooves 13a2, 13bz of the retainers 132, 13b, the first gear stage or the second gear stage can be changed. The gears 32, 3b can be selectively fastened to the rotating shaft 1. And the first
As is clear from a comparison between the figure and FIG. 6, the gears 32, 3b of the second embodiment have recesses 32, 3 formed inside
b, inner cam 102, 10b and roller 122
, 12b, the axial thickness of the gears 32, 3b can be significantly reduced, and the dowel entry grooves 13a2, 13b2 are connected to the adjacent rollers 12a.

Together with the arrangement between the roller synchronizers 12b and 12b, the axial dimension of the roller synchronizer mechanism can be further shortened.

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

For example, in the embodiment, the roller synchronizer mechanism is provided between the first gear and the second gear, but it is of course possible to provide it in other gears. Similarly, the rollers 12 of the retainers 132, 13b
Dowel entry grooves 13a2, 13b2 are formed between the inner cams 102, 10b, the rollers 122, 12b, It is also possible to shorten the axial dimension of the roller synchronizing mechanism only by arranging the retainers 132, 13b in the recesses 3a3.3bs formed inside the gears 32, 3b.

C0 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 reduced by the thickness of the retainer for holding the rollers. Even if the minimum thickness of silver is required, the dowel entry groove can be formed within that thickness range. Therefore, it is possible to reduce the thickness of the retainer compared to the conventional one, and the axial dimension of the o-ra synchro mechanism is shortened.

According to the second feature of the present invention, at least a portion of the inner cam, roller, and retainer are disposed in a recess formed inside the gear, so that the inner cam, roller, and retainer are disposed in a recess formed inside the gear. There is no need to form a housing protrusion on the side surface of the gear. As a result, the thickness of the gear can be reduced compared to conventional gears, and the axial dimension of the roller synchronizer mechanism can be shortened.

[Brief explanation of drawings]

1 to 4 show a first embodiment of the present invention. FIG. 1 is a sectional view taken along the line II in FIG. 2 showing the roller synchronizing mechanism, and FIG. 3 is a sectional view taken along the line ■--m in FIG. 1, FIG. 4 is a perspective view of the retainer, and FIG. 5 shows a second embodiment of the present invention. FIG. 6 shows a conventional example, and is a sectional view corresponding to FIG. 3. 1...Rotating shaft, 32, 3b-gear, 3a2, 3b2・
...Roller contact surface, 3 as, 3 bs... recess, 8... sleeve, 82, 8b-dowel, 102, 1
0b-・Inner cam, 10a+, 10tz-・Cam groove, 12 2, 12 b・Roller, 132, 13b-
... Retainer, 13a2.13bz"' Dowel entry groove No. 4
figure

Claims (2)

[Claims] (1) A gear (
3a, 3b), and inner cams (10a, 10b) fixed to the rotating shaft (1) and having a plurality of cam grooves (10a_1, 10b_1) formed on the outer periphery facing the roller contact surfaces (3a_2, 3b_2). And this inner cam (1
0a, 10b) cam grooves (10a_1, 10b_1) and the roller contact surfaces (3a_2) of the gears (3a, 3b)
, 3b_2).
2b) and a retainer (12a, 12b) that holds the rollers (12a, 12b) so as to be slightly movable in the radial direction and has dowel entry grooves (13a_2, 13b_2) formed on the side surfaces thereof.
13a, 13b) and the dowel entry groove (13
Dowels (8a, 8b) that can be freely engaged and detached from a_2, 13b_2)
This sleeve (8) is provided with a sleeve (8) formed with a
) to the retainers (13a, 13
By separating from the dowel entry grooves (13a_2, 13b_2) of b), the rollers (12a, 12a,
12b) outward in the radial direction to connect the gears (3a, 3b).
) in pressure contact with the roller contact surfaces (3a_2, 3b_2),
In the roller synchro mechanism that integrally fastens the rotating shaft (1) and the gears (3a, 3b), the retainer (13a
, 12b) are formed between adjacent rollers (12a, 12b) held by the retainers (13a, 13b). (2) A gear (
3a, 3b), and inner cams (10a, 10b) fixed to the rotating shaft (1) and having a plurality of cam grooves (10a_1, 10b_1) formed on the outer periphery facing the roller contact surfaces (3a_2, 3b_2). And this inner cam (1
0a, 10b) cam grooves (10a_1, 10b_1) and the roller contact surfaces (3a_2) of the gears (3a, 3b)
, 3b_2).
2b) and a retainer (12a, 12b) that holds the rollers (12a, 12b) so as to be slightly movable in the radial direction and has dowel entry grooves (13a_2, 13b_2) formed on the side surfaces thereof.
13a, 13b) and the dowel entry groove (13
Dowels (8a, 8b) that can be freely engaged and detached from a_2, 13b_2)
This sleeve (8) is provided with a sleeve (8) formed with a
) to the retainers (13a, 13
By separating from the dowel entry grooves (13a_2, 13b_2) of b), the rollers (12a, 12a,
12b) outward in the radial direction to connect the gears (3a, 3b).
) in pressure contact with the roller contact surfaces (3a_2, 3b_2),
In the roller synchronizer mechanism in which the rotating shaft (1) and the gears (3a, 3b) are integrally connected, the inner cam (1)
0a, 10b), rollers (12a, 12b), and at least a portion of the retainer (13a, 13b) in the recesses (3a_3, 3) formed inside the gears (3a, 3b).
b_3) A roller synchro mechanism, characterized in that it is disposed in.