JP2009228814A - Transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transmission capable of restraining generation of loss torque, without allowing mutual contact between tapered surfaces of relatively rotating members, when a synchronizer ring is freely rotating. <P>SOLUTION: This transmission 10 includes a rotary shaft 2, a clutch hub 3, a shift gear 5, a gear piece 6, the synchronizer ring 7, a sleeve, and a pressing member 81 for pressing the synchronizer ring 7 to the clutch hub 3 side by converting centrifugal force by rotation of the rotary shaft 2 in the direction for expanding between the gear piece 6 and the synchronizer ring 7, between the gear piece 6 and the synchronizer ring 7. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a transmission, and more particularly to a transmission having a synchronizer ring and performing a synchronous operation.

  The automobile is provided with a transmission for converting engine power according to driving conditions and taking it out. There are gear type and belt type transmissions, and gear type transmissions with little power transmission loss are often used.

  A gear-type transmission is a device that switches a plurality of transmission gears for the purpose of outputting input engine power in accordance with traveling conditions. This transmission has a plurality of speed change gears, and one of the speed change gears is selected and switched to that speed change gear.

  The transmission is provided with a synchronizer ring in order to perform a speed change quickly and easily when the speed change gear is switched. The synchronizer ring has a conical tapered surface (gear piece side outer peripheral surface) and a conical tapered surface (synchronizer ring side inner peripheral surface) capable of frictional engagement with a gear piece that rotates integrally with the gear. Then, when the gear taper surface and the taper surface of the synchronizer ring are frictionally engaged and rotate, the transmission synchronization operation is completed, and the transmission gear can be switched. When the gear and synchronizer ring do not synchronize, the axial direction and radial direction of the rotary shaft located on the center side of the synchronizer ring or gear so that the tapered surface of the synchronizer ring and the tapered surface of the gear are not in contact with each other Has clearance. For this reason, the synchronizer ring is tilted due to its own weight or rotation during idle rotation. On the other hand, since the gear rotates relative to the synchronizer ring, a drag load is generated when the inclined synchronizer ring comes into contact with the tapered surface. In the multi-cone type synchronizer, the synchronizer ring consisting of the inner ring, middle ring, and outer ring rotates relative to each other, and dragging occurs between the idle middle ring and the inner ring or outer ring. There are things to do.

When dragging occurs, so-called loss torque that reduces transmission efficiency is generated. Various ideas have been made to reduce such a loss torque. For example, Patent Document 1 discloses a means for avoiding contact between two opposing tapered surfaces during idle rotation in which the synchronization device has two synchronizer rings, a synchro cone and a synchro ring. That is, a spline on the outer peripheral surface facing the synchrocone is formed in a gear tapered on the opposite side of the synchrocone that is not opposed to the tapered surface of the synchroring so as to become gradually narrower as it is separated from the synchroring. Then, the tooth provided on the synchro cone to be engaged with the spline is formed in a tapered shape that gradually becomes wider as it is separated from the synchro ring. By forming in this way, the synchro cone is rotated by being pulled to the gear side during free rotation, so that it is difficult to contact the relatively rotating synchro ring with the tapered surface, and the loss torque can be reduced.
JP 11-182578 A

  The present invention has been made in view of the above problems, and provides a transmission that can suppress the generation of loss torque because the tapered surfaces of the relatively rotating members do not contact each other when the synchronizer ring is idle. For the purpose.

The structural feature of the invention according to claim 1 for solving the above-mentioned problems is that the rotating shaft,
A clutch hub fixed on the rotating shaft and having engaging teeth on the outer periphery;
A transmission gear rotatably held on the rotating shaft;
A gear piece having a tapered gear piece side outer peripheral surface which is coupled to the clutch hub side of the transmission gear and has an engagement tooth on the outer periphery, and projects so as to reduce the diameter toward the clutch hub side;
A tapered shape that is located between the clutch hub and the gear piece, has engagement teeth on the outer periphery, the inner peripheral surface expands from the clutch hub toward the gear piece, and can be fitted to the outer peripheral surface on the gear piece side. A synchronizer ring having an inner peripheral surface on the synchronizer ring side, axially movable with respect to the clutch hub and engaged in the circumferential direction;
The engagement teeth of the clutch hub, the engagement teeth of the synchronizer ring, and the engagement teeth that can be engaged with the engagement teeth of the gear piece have an inner peripheral surface and can slide in the axial direction on the clutch hub. And a sleeve held by
In a transmission that synchronizes the rotation of the clutch hub and the transmission gear by sliding the sleeve from the clutch hub toward the gear piece and frictionally engaging the synchronizer ring and the gear piece based on a gear change operation. ,
Between the gear piece and the synchronizer ring, there is provided a pressing member that converts a centrifugal force due to rotation of the rotating shaft in a direction to expand between the gear piece and the synchronizer ring and presses the synchronizer ring toward the clutch hub. It is characterized by that.

  Further, the structural feature of the invention according to claim 2 is that in claim 1, the gear piece is formed with a pressing member storage space having an opening in which an end portion in the diameter increasing direction opens toward the synchronizer ring side. The pressing member is movable in the pressing member storage space in the radial direction in the pressing member storage space, and is entirely stored in the opening so as not to protrude from the opening, and is centrifuged by the rotation of the rotating shaft. It is a member that presses the synchronizer ring with force and biases it toward the clutch hub.

  According to a third aspect of the present invention, there is provided a structural feature of the invention according to the second aspect, wherein the pressing member storage space is a cylindrical hole that inclines toward the synchronizer ring as it goes in the diameter-expanding direction. Is an opening toward the end face of the synchronizer ring facing the gear piece.

  A structural feature of the invention according to claim 4 is that, in claim 3, the pressing member is a spherical member larger than a gap between the opening and the end of the synchronizer ring.

  In the first aspect of the invention, since the centrifugal force generated by the rotation of the rotating shaft is converted into a direction in which the space between the gear piece and the synchronizer ring is enlarged and the synchronizer ring is pressed toward the clutch hub, the pressing member is the synchronizer. Press the ring toward the clutch hub. Therefore, when the synchronizer ring is rotating relative to the idle gear piece, the synchronizer ring inner peripheral surface of the synchronizer ring and the outer peripheral surface of the gear piece side of the gear piece are less likely to come into contact with each other. Thus, generation of loss torque can be suppressed.

  In the invention which concerns on Claim 2, since a press member storage space only forms the space which stores a press member in a gear piece, manufacture is easy.

  In the invention which concerns on Claim 3, since the opening part of a press member storage space opens toward the end surface which faced the gear piece side of a synchronizer ring, a press member does not contact a synchronizer ring side inner peripheral surface, but it synchronizes. Therefore, the synchronizer ring side inner peripheral surface is not affected. In addition, since the opening opens toward the end face facing the gear piece side, the pressing member storage space is inclined toward the synchronizer ring so that the pressing member can be released from the opening by centrifugal force and press the synchronizer ring. It is desirable to do.

  In the invention according to claim 4, since the pressing member has a spherical shape, there are few surfaces that come into contact with the synchronizer ring, and since sliding is good with respect to the relatively rotating member, the frictional resistance can be reduced. In other words, the loss torque can be further reduced by contacting the synchronizer ring with the spherical pressing member, rather than contacting the synchronizer ring with the non-spherical pressing member.

  A representative embodiment of the present invention will be described with reference to FIGS. The synchronization device according to the present embodiment is mounted on a transmission of a vehicle.

(Embodiment 1)
As shown in FIG. 1, the transmission 10 according to the first embodiment includes a rotating shaft 2, a clutch hub 3, a sleeve 4, a transmission gear 5, a gear piece 6, and a synchronizer ring 7.

  The rotating shaft 2 is a rod-like member that rotates when the power of an internal combustion engine (not shown) outside the transmission is transmitted.

  The clutch hub 3 is a cylindrical member that is fixed to the outer peripheral side of the rotary shaft 2 and rotates integrally with the rotary shaft 2 and has clutch hub engagement teeth 31 formed on the outer periphery. A ball 32 that urges a sleeve 4 to be described later toward the outer peripheral side is incorporated.

  The transmission gear 5 is a cylindrical member that is rotatably held on a rotating shaft 2 via a bearing (not shown), and is arranged with two clutch hubs 3 sandwiched from the axial direction (in FIG. Left and right of hub 3).

  The gear piece 6 is a member that is coupled to the transmission gear 5 so as to rotate integrally with the transmission gear 5 and is positioned between the clutch hub 3 and the transmission gear 5. In the present embodiment, the transmission gear 5 and the gear piece 6 on the left side of the clutch hub 3 are formed as separate members, and the transmission gear 5 and the gear piece 6 on the right side of the clutch hub 3 are integrally formed. In either form, the transmission gear 5 and the gear piece 6 rotate integrally. The gear piece 6 slides on the outer peripheral side with a gear piece engaging tooth 61 that engages with a sleeve engaging tooth 41 of a sleeve 4 to be described later and a synchronizer ring side inner peripheral surface 71 of a synchronizer ring 7 to be described later. A tapered gear piece side outer circumferential surface 62 is formed so as to project toward the diameter. A pressing member storage space 63 is formed at the end of the gear piece side outer peripheral surface 62 between the gear piece side outer peripheral surface 62 and the gear piece engaging teeth 61. The pressing member storage space 63 is a cylindrical hole that has an opening 631 that opens toward the synchronizer ring 7 and that inclines toward the synchronizer ring 7 as the diameter increases. A pressing member 81 is stored in the pressing member storage space 63. The entire pressing member 81 is stored in the pressing member storage space 63 in a state where the pressing member 81 is spherical and the gear piece 6 does not rotate and centrifugal force is not applied to the pressing member 81. When the gear piece 6 rotates, the gear piece 6 protrudes from the opening 631 side by centrifugal force and contacts the end face of the synchronizer ring 7 facing the gear piece 6 side. However, since it is larger than the gap with the gear piece 6 synchronizer ring 7, the whole does not protrude from the pressing member storage space 63. The force with which the pressing member 81 presses the synchronizer ring 7 with centrifugal force is a force that does not cause a large resistance when the transmission 10 operates synchronously. And the press member storage space 63 is formed in three places in the circumferential direction of the gear piece 6, and the space | interval of the circumferential direction of each press member storage space 63 is equal.

  The synchronizer ring 7 is coaxial with the rotary shaft 2 and is positioned between the clutch hub 3 and the gear piece 6 (transmission gear 5). A synchronizer ring-side inner peripheral surface 71 that is engageable with the gear piece-side outer peripheral surface 62 of the gear piece 6 is formed in a cylindrical shape whose inner peripheral surface expands from the clutch hub 3 toward the gear piece 6. Further, synchronizer ring engagement teeth 72 that engage with sleeve engagement teeth 41 of the sleeve 4 described later are formed on the outer peripheral side.

  The sleeve 4 is a cylindrical member that is coaxial with the rotary shaft 2 and the clutch hub 3 and is held on the outer peripheral side of the clutch hub 3 so as to be slidable in the axial direction. Sleeve engagement teeth 41 that can be engaged with the clutch hub engagement teeth 31 of the clutch hub 3, the synchronizer ring engagement teeth 72 of the synchronizer ring 7, and the gear piece engagement teeth 61 of the gear piece 6 are formed on the inner periphery. ing. The sleeve 4 is in a neutral position in the axial direction when both the transmission gears 5 (gear pieces 6) arranged with the clutch hub 3 interposed therebetween are not engaged.

  The basic operation of the transmission 10 according to the first embodiment will be briefly described. When synchronizing the rotation of the rotating shaft 2 and the transmission gear 5, the sleeve 4 in the neutral position moves toward the gear piece 6 in the axial direction. This movement is performed based on an operation of a shift lever (not shown) connected to the shift fork, since a shift fork (not shown) is engaged with a groove 42 formed on the outer periphery of the sleeve 4. . When the sleeve 4 starts to move in the axial direction, the sleeve engaging teeth 4 press the ball 32 toward the inner peripheral side (rotating shaft 2 side). Then, the sleeve engaging teeth 41 of the sleeve 4 and the synchronizer ring engaging teeth 72 of the synchronizer ring 7 are engaged, and the synchronizer ring 7 is coupled to the clutch hub 3 via the sleeve 4 and rotates in the same direction as the clutch hub 3. . Since the clutch hub 3 is fixed to the rotary shaft 2 and rotates integrally with the rotary shaft 2, the synchronizer ring 7 rotates in the same direction as the rotary shaft 2. Then, the sleeve 4 is further slid toward the axial transmission gear 5 side. The inner peripheral surface 71 of the synchronizer ring 7 and the outer peripheral surface 62 of the gear piece 6 are frictionally engaged with each other. At this time, since the ball 32 of the clutch hub 3 presses the position shifted from the center of the sleeve 4 to the outer peripheral side, the synchronizer ring 7 is pressed by the gear piece 6, and the synchronizer ring side inner peripheral surface 71 and the gear piece side outer peripheral surface 62 The frictional force increases. When the gear piece 6 rotates in the same direction as the synchronizer ring 7, the sleeve 4 further slides toward the axial transmission gear 5, and the sleeve engaging teeth 41 of the sleeve 4 and the gear piece engaging teeth 61 of the gear piece 6 Are engaged, and the rotary shaft 2 and the transmission gear 5 rotate in the same direction, completing the synchronous operation.

  In the transmission 10 according to the first embodiment, when the synchronization operation is not performed, the synchronizer ring 7 is in an idle state and rotates relative to the gear piece 6. The gear piece 6 rotates in the same manner as the transmission gear 5, and centrifugal force is applied to the pressing member 81 stored in the pressing member storage space 63 provided in the gear piece 6, so that the opening 631 side of the pressing member storage space 63 is provided. Move to (indicated by a broken line). And it protrudes from the opening part 631 and the position which remove | deviated from the end surface of the synchronizer ring 7, ie, the synchronizer ring side inner peripheral surface 71, is pressed. Therefore, the synchronizer ring 7 is pushed toward the clutch hub 3 so that the space between the gear piece 6 and the synchronizer ring 7 is enlarged. As a result, the synchronizer ring-side inner peripheral surface 71 of the synchronizer ring 7 that is rotating is less likely to contact the gear piece-side outer peripheral surface 62 of the gear piece 6, so that a drag load is less likely to be generated on the gear piece 6 and loss torque is generated. Can be suppressed.

  The pressing member storage space 63 in which the pressing member 81 is stored only needs to form a cylindrical hole on the inner peripheral side of the gear piece. Since the pressing member 81 is also a spherical member, the manufacturing is simple. In addition, since the pressing member 81 is spherical, there are few surfaces in contact with the synchronizer ring, and sliding is good, so that the frictional resistance is small. That is, the loss torque due to the friction generated when the pressing member 81 contacts the synchronizer ring 7 is considerably smaller than the loss torque generated when the synchronizer ring side inner peripheral surface 71 and the gear piece side outer peripheral surface 62 contact each other. Loss torque can be reduced.

  Further, since the pressing member 81 and the pressing member storage space 63 are arranged at three positions at equal intervals in the circumferential direction of the gear piece 6, the synchronizer ring 7 loses its balance and is difficult to tilt. The contact between the inner peripheral surface 71 and the gear piece side outer peripheral surface 62 can also be suppressed.

(Embodiment 2)
Embodiment 2 of the present invention will be specifically described. The second embodiment has basically the same configuration and the same function and effect as the first embodiment. The following description will focus on the different parts.

  As shown in FIG. 2, in the transmission 11 according to the second embodiment, the pressing member storage space 63 is open in the gear piece side outer peripheral surface 62 of the gear piece 6 and toward the synchronizer ring side inner peripheral surface 71 of the synchronizer ring 7. 631 is formed to open. And the pressing member 81 is accommodated in the inside.

  According to the transmission 11 of the second embodiment, a drag load is generated by contact, and the pressing member 81 is provided between the gear piece side outer peripheral surface 62 and the synchronizer ring side inner peripheral surface 71 where loss torque is generated. Since it protrudes from the side by centrifugal force (indicated by a broken line), the contact between the gear piece side outer peripheral surface 62 and the synchronizer ring side inner peripheral surface 71 can be further avoided, so that the generation of loss torque can be further suppressed.

(Embodiment 3)
Embodiment 3 of the present invention will be specifically described. The third embodiment basically has the same configuration and the same function and effect as the first and second embodiments. The following description will focus on the different parts. FIG. 3 shows an enlarged view of the main part of the transmission of the third embodiment. FIG. 3 corresponds to a portion surrounded by a broken line A in FIG.

  As shown in FIG. 3, in the transmission according to the third embodiment, a pressing member storage space 63α is formed between the gear piece engaging teeth 61 of the gear piece 6 and the gear piece side outer peripheral surface 62, and the pressing member housing space 63 α is pressed inside. The member 82 is accommodated. The pressing member 82 is a fan-shaped member having one end slidably held in the pressing member storage space 63α and the other end side having an arc shape. The pressing member 82 swings toward the synchronizer ring 7 when a centrifugal force is applied (indicated by a broken line).

  In the transmission of the third embodiment, centrifugal force is applied to the pressing member 82 housed in the pressing member housing space 63α of the gear piece 6 that rotates in the same manner as the gear 5 and swings in the clockwise direction in the drawing. (Displayed with a broken line). When the pressing member 82 rotates, it protrudes from the pressing member storage space 63α, contacts the side surface of the gear piece 6 of the synchronizer ring 7, and presses the synchronizer ring 7 toward the clutch hub 3. That is, the synchronizer ring 7 is pressed so as to enlarge the space between the gear piece 6 and the synchronizer ring 7. Therefore, the contact of the gear piece side outer peripheral surface 62 and the synchronizer ring side inner peripheral surface 71 is suppressed, and as a result, generation of loss torque can be suppressed.

(Embodiment 4)
Embodiment 4 of the present invention will be specifically described. The fourth embodiment has basically the same configuration and the same function and effect as the first, second, and third embodiments. The following description will focus on the different parts. FIG. 4 shows an enlarged view of the main part of the transmission of the fourth embodiment. 4 corresponds to a portion surrounded by a broken line A in FIG.

  As shown in FIG. 4, in the transmission of the fourth embodiment, a pressing member storage space 63β is formed between the gear piece engaging teeth 61 of the gear piece 6 and the gear piece side outer peripheral surface 62, and a spherical shape is formed inside. The auxiliary member 83 is housed. The auxiliary member 83 moves to the outer peripheral side by centrifugal force due to the rotation of the gear piece 6. Then, the bottom surface 841 of the L-shaped pressing member 84 stored in the pressing member storage space 63β in the same manner as the auxiliary member 83 is pressed to the outer peripheral side. The L-shaped pressing member 84 forms a substantially L shape with a bottom surface 841 pressed by the auxiliary member 83 and a pressing surface 842 facing the synchronizer ring 7 and formed to intersect the bottom surface 841. The portion to be moved is held in the pressing member storage space 63β so as to be slidable.

  In the transmission of the fourth embodiment, the auxiliary member 83 built in the gear piece 6 that rotates in the same manner as the gear 5 moves to the outer peripheral side by centrifugal force (indicated by a broken line). Then, the bottom surface 841 of the L-shaped pressing member 84 is pressed, the pressed L-shaped pressing member 84 swings (clockwise in the figure, indicated by a broken line), and the end of the pressing surface 842 is the synchronizer ring 7. It contacts the side surface of the gear piece 6 and presses the synchronizer ring 7 toward the clutch hub 3 side. Therefore, since the idle synchronizer ring 7 moves to the clutch hub 3 side, the space between the gear piece 6 and the synchronizer ring 7 is enlarged. Accordingly, contact between the gear piece side outer peripheral surface 62 and the synchronizer ring side inner peripheral surface 71 is suppressed, and as a result, generation of loss torque can be suppressed.

  In the third embodiment, when the swinging pressing member 82 cannot sufficiently press the synchronizer ring 7, a larger pressing force can be obtained by pressing the auxiliary swinging member with the spherical auxiliary member 83 as in the fourth embodiment. The synchronizer ring 7 can be moved toward the clutch hub 3 by pressure.

  The shape of the L-shaped pressing member 84 used in the transmission of the fourth embodiment is the same as the shape of the pressing member 82 used in the transmission of the third embodiment, and the shape of the pressing member 82 used in the transmission of the third embodiment. The shape of the L-shaped pressing member 84 used in the transmission of the fourth embodiment can be used.

(Other variations)
The springs that bias the pressing member 81 of the first and second embodiments, the pressing member 82 of the third embodiment, and the auxiliary member 83 of the fourth embodiment in the diameter increasing direction can be stored in the pressing member storage spaces 63, 63α, and 63β. . When the gear piece 6 rotates slowly and centrifugal force cannot be applied sufficiently, the pressing members 81 and 82 and the auxiliary member 83 are moved in the diameter increasing direction by the spring force of the spring, and the synchronizer ring 7 is moved to the clutch hub 3 side. Let As a result, the contact between the gear piece side outer peripheral surface 62 and the synchronizer ring side inner peripheral surface 71 is suppressed, and the generation of loss torque is suppressed. Alternatively, the spring may urge the pressing members 81 and 82 and the auxiliary member 83 in the diameter reducing direction. By doing in this way, when the centrifugal force applied to the pressing members 81 and 82 and the auxiliary member 83 is too large, or when the rotation of the gear piece 6 is slow and it is not necessary to press the synchronizer ring 7 toward the clutch hub 3 side. The pressing members 81 and 82 and the auxiliary member 83 can be prevented from contacting the synchronizer ring 7. This is particularly effective when the pressing members 81 and 82 and the auxiliary member 83 are in contact with the inner peripheral surface 71 on the synchronizer ring side to press the synchronizer ring 7 toward the clutch hub 3 side. It can suppress that the synchronizer ring side inner peripheral surface 71 reduces by contact.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment. For example, in a transmission in which a synchronizer ring is composed of an inner ring, a middle ring, and an outer ring, and two or three multi-cone synchronizers are provided with two or three tapered cone surfaces that frictionally slide for synchronous operation. Is also applicable. In the multi-cone synchronizer, the outer ring is engaged with the clutch hub, and the inner ring is engaged with the outer ring. The middle ring is engaged with the gear piece. When the synchronization operation is not performed, the middle ring rotates freely. Therefore, by providing the outer ring with a pressing member, it is possible to suppress contact between the outer ring and the inner ring when the middle ring rotates.

It is explanatory drawing which shows the principal part of the transmission 10 of this Embodiment 1. FIG. It is explanatory drawing which shows the principal part of the transmission 11 of this Embodiment 2. FIG. It is explanatory drawing to which the principal part of the transmission of this Embodiment 3 was expanded. It is explanatory drawing to which the principal part of the transmission of this Embodiment 4 was expanded.

Explanation of symbols

10, 11: transmission,
2: Rotating shaft,
3: Clutch hub, 31: Clutch hub engaging teeth, 32: Ball,
4: Sleeve, 41: Sleeve engaging tooth, 42: Groove,
5: Transmission gear,
6: gear piece, 61: gear piece engaging tooth, 62: gear piece side outer peripheral surface, 63: pressing member storage space, 631: opening,
7: Synchronizer ring, 71: Synchronizer ring side inner peripheral surface, 72: Synchronizer ring engagement tooth,
81, 82, 83: pressing member, 84: L-shaped pressing member, 841: bottom surface, 842: pressing surface.

Claims (4)

A rotation axis;
A clutch hub fixed on the rotating shaft and having engaging teeth on the outer periphery;
A transmission gear rotatably held on the rotating shaft;
A gear piece having a tapered gear piece side outer peripheral surface which is coupled to the clutch hub side of the transmission gear and has an engagement tooth on the outer periphery, and projects so as to reduce the diameter toward the clutch hub side;
A tapered shape that is located between the clutch hub and the gear piece, has engagement teeth on the outer periphery, the inner peripheral surface expands from the clutch hub toward the gear piece, and can be fitted to the outer peripheral surface on the gear piece side. A synchronizer ring having an inner peripheral surface on the synchronizer ring side, axially movable with respect to the clutch hub and engaged in the circumferential direction;
The engagement teeth of the clutch hub, the engagement teeth of the synchronizer ring, and the engagement teeth that can be engaged with the engagement teeth of the gear piece have an inner peripheral surface and can slide in the axial direction on the clutch hub. And a sleeve held by
In a transmission that synchronizes the rotation of the clutch hub and the transmission gear by sliding the sleeve from the clutch hub toward the gear piece and frictionally engaging the synchronizer ring and the gear piece based on a gear change operation. ,
Between the gear piece and the synchronizer ring, there is provided a pressing member that converts a centrifugal force due to rotation of the rotating shaft in a direction to expand between the gear piece and the synchronizer ring and presses the synchronizer ring toward the clutch hub. A transmission characterized by that. The gear piece is formed with a pressing member storage space having an opening in which an end portion in a diameter increasing direction opens toward the synchronizer ring side,
The pressing member is movable in the pressing member storage space in the radial direction in the pressing member storage space, and is entirely stored in the opening so as not to protrude from the opening, and is centrifuged by the rotation of the rotating shaft. The transmission according to claim 1, wherein the transmission is a member that presses the synchronizer ring with force to urge the synchronizer ring toward the clutch hub.   The pressing member storage space is a cylindrical hole that inclines toward the synchronizer ring as it goes in the diameter-expanding direction, and the opening opens toward an end surface of the synchronizer ring facing the gear piece. 2. The transmission according to 2.   The transmission according to claim 3, wherein the pressing member is a spherical member larger than a gap between the opening and the end of the synchronizer ring.

Images