JP6072741B2 - Transmission synchronizer - Google Patents

Description

  The present invention is coupled to a gear that is rotatably supported on a rotating shaft, a dog-toothed ring that has dog teeth on the outer periphery and that is supported to be relatively rotatable by a predetermined angle on the gear, and the rotating shaft. A hub, a sleeve splined to the hub so as to be axially slidable, and dog teeth engageable with spline teeth on the inner periphery of the sleeve are provided on the outer periphery, and enables frictional engagement with the gear. The present invention relates to a transmission synchronizer including the hub and a blocking ring disposed between the gears.

  A driven rotating body (ring with dog teeth) is supported so as to be relatively rotatable by a predetermined angle, the gear and the driven rotating body are connected by a torsion spring, and the spline teeth of the sleeve that is spline-fitted to the shaft are driven by the rotating body. Patent Document 1 below discloses a dog clutch in which a gear is coupled to a shaft by meshing with a dog tooth. According to this dog clutch, even if a friction larger than the scraping force generated by the contact of the slope of the spline teeth of the sleeve and the slope of the dog teeth of the driven rotor is generated in the drive path, it exceeds the load of the torsion spring. If the scraping force can be generated, the driven rotating body rotates relative to the gear while deforming the torsion spring, whereby the spline teeth can be engaged with the dog teeth.

JP 2001-330053 A

  However, since the above-mentioned conventional one is arranged so that the large-diameter torsion spring surrounds the outer periphery of the driven rotating body, there is a problem that the size of the dog clutch increases due to this torsion spring.

  The present invention has been made in view of the above-described circumstances, and in a synchronization device including a dog-toothed ring that is rotatably supported by a gear, the spring for holding the dog-toothed ring in a neutral position is arranged in a compact manner. Objective.

  In order to achieve the above object, according to the first aspect of the present invention, there is provided a gear that is relatively rotatably supported on the rotating shaft, and has dog teeth on the outer periphery so that the gear can be relatively rotated by a predetermined angle. A ring with a supported dog tooth; a hub coupled to the rotating shaft; a sleeve splined to the hub so as to be axially slidable; and a dog tooth meshable with a spline tooth on the inner periphery of the sleeve. A blocking ring disposed between the hub and the hub, the spline teeth of the sleeve being included in the dog teeth of the blocking ring and the dog toothed ring. The transmission synchronizer is configured to be engaged with a dog tooth of the transmission to couple the gear to the rotary shaft, and the gear is supported by the rotary shaft so as to be relatively rotatable. Formed in the disk part, a disc-shaped disk part extending radially outward from the boss part, gear teeth formed on the outer periphery of the disk part, a through hole penetrating the disk part, and the disk part The dog-toothed ring has a circumferential width smaller than the circumferential width of the through hole and protrudes in the axial direction. And a distal end of the projecting portion is fixed by a fixing means to a fixing ring that is in contact with the disk portion in a state of passing through the through hole, and the fixing ring includes a lid portion that covers the spring housing recess, and the coil spring And a spring abutting portion that holds the dog-toothed ring in a neutral position in the center in the circumferential direction. .

  According to the invention described in claim 2, in addition to the configuration of claim 1, the dog-toothed ring is provided between the disk portion and the fixing ring against the urging force of the coil spring. A transmission synchronizer is provided that includes a detent mechanism that stably holds a neutral position in the center in the circumferential direction.

  The first gear 16 of the embodiment corresponds to the gear of the present invention, the first blocking ring 20 of the embodiment corresponds to the blocking ring of the present invention, and the dog teeth of the first blocking ring 20 of the embodiment. 20a corresponds to the dog teeth of the blocking ring of the present invention, the circlip 26 of the embodiment corresponds to the fixing means of the present invention, and the acceleration coil spring 27 and the deceleration coil spring 28 of the embodiment correspond to those of the present invention. Corresponds to coil spring.

  According to the configuration of the first aspect, the synchronization device includes a gear that is rotatably supported by the rotation shaft, and a dog-tooth ring that has dog teeth on the outer periphery and is supported by the gear so as to be relatively rotatable by a predetermined angle. A hub coupled to the rotating shaft, a sleeve splined to the hub so as to be axially slidable, and a dog tooth engageable with the spline teeth on the inner periphery of the sleeve on the outer periphery, and frictional engagement with the gear And a gear ring coupled to the rotating shaft by engaging the spline teeth of the sleeve with the dog teeth of the blocking ring and the dog teeth of the dog-toothed ring. be able to.

  The dog-toothed ring penetrates the through-hole of the disk part of the gear of the protruding part, and the circumferential width of the protruding part is smaller than the circumferential width of the through-hole. The spring contact part of the fixed ring that is freely fixed to the disk part by the fixing means is engaged with the coil spring, and the dog-toothed ring is held at the neutral position in the center in the circumferential direction. Even if the gear and the rotating shaft are difficult to rotate relative to each other, that is, even if the dog-toothed ring and the sleeve are difficult to rotate relative to each other, the slopes of the spline teeth of the sleeve and the dog-toothed surfaces of the dog-toothed ring By rotating the dog-toothed ring relative to the gear against the spring force of the coil spring by the scraping torque caused by the contact of the sleeve, the spline teeth of the sleeve are the dog-toothed ring. It can be engaged smoothly pushing through the dog teeth. After that, when the dog-toothed ring and the gear are relatively rotated to the limit position by the torque transmitted from the driving source, the protrusion of the dog-toothed ring comes into contact with one of the inner edges of the through-hole of the gear. The dog-toothed ring and the gear can be integrated to transmit the driving force without any trouble.

  Since the coil spring is housed in a spring housing recess formed in the disk portion of the gear and covered with the lid portion of the fixing ring, the coil spring is arranged compactly inside the gear so that the radial dimension and axial dimension of the synchronizer can be adjusted. It can be downsized.

  According to the second aspect of the present invention, the detent mechanism that stably holds the dog-toothed ring at the neutral position in the center in the circumferential direction against the urging force of the coil spring is provided between the disk portion and the fixing ring. Therefore, the synchro device can be operated more stably by always maintaining the phase of the gear and the phase of the dog-toothed ring in a constant relationship.

The longitudinal cross-sectional view of the synchronizer along the axis line of a rotating shaft. The disassembled perspective view of a 1st gear, a dog tooth ring, a fixing ring, and a circlip. The disassembled perspective view of a 1st gear, a ring with a dog tooth, a guide ring, and a diaphragm spring. FIG. 4 is a sectional view taken along line 4-4 of FIG. Action | operation explanatory drawing (the 1) of a synchronizer. Action | operation explanatory drawing (the 2) of a synchronizer.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, a hollow rotating shaft 13 is rotatably supported by a mission case 11 via a ball bearing 12, and is relatively rotatably supported by needle bearings 14 and 15 on the outer periphery of the rotating shaft 13. The first gear 16 and the second gear 17 thus made can be selectively coupled to the rotating shaft 13 by the synchronization device S.

  The synchronizer S includes a hub 18 splined to the rotary shaft 13 between the first gear 16 and the second gear 17, a sleeve 19 splined to the outer periphery of the hub 18 so as to be axially slidable, a hub 18 and A first blocking ring 20 disposed between the first gear 16, a first synchronizer spring 21 disposed between the hub 18 and the first blocking ring 20, and a second disposed between the hub 18 and the second gear 17. A blocking ring 22 and a second synchronizer spring 23 disposed between the hub 18 and the second blocking ring 22 are provided. The first gear 16 is coupled to the rotary shaft 13 by the right movement of the sleeve 19, and the sleeve 19 The second gear 17 is coupled to the rotating shaft 13 by the left movement.

  The structure of the left half portion of the synchronizer S, that is, the portion that couples the second gear 17 to the rotating shaft 13 is well known in the art and will not be described in detail. On the other hand, the right half of the synchronizer S, that is, the part that couples the first gear 16 to the rotary shaft 13 is novel, and detailed description of the structure will be described in detail below.

  As shown in FIG. 1, a large number of spline teeth 19 a that are spline-fitted to the outer periphery of the hub 18 are formed on the inner periphery of the sleeve 19, and the spline teeth 19 a of the sleeve 19 are formed on the outer periphery of the first blocking ring 20. A number of engageable dog teeth 20 a are formed, and the first synchronizer spring 21 is disposed between the spline teeth 19 a of the sleeve 19 and the dog teeth 20 a of the first blocking ring 20.

  As shown in FIGS. 1 to 4, the first gear 16 includes a boss portion 16 a that is rotatably supported by the rotary shaft 13, a disk portion 16 b that extends radially outward from the boss portion 16 a, and an outer periphery of the disk portion 16 b. .. Are formed, and nine through holes 16d arranged at equal intervals in the circumferential direction penetrate the disk portion 16b in the axial direction. Two arc-shaped coil spring housing recesses 16e, 16e are formed on the side surface opposite to the hub 18 so as to surround the radially outer side of the through holes 16d. Further, the boss portion 16a of the first gear 16 is formed with a cone surface 16g capable of contacting the cone surface 20b formed on the first blocking ring 20 (see FIG. 1).

  The dog-toothed ring 24 assembled to the side surface of the first gear 16 on the hub 18 side includes an annular portion 24b in which a large number of dog teeth 24a are formed on the outer periphery, and an axial direction from the annular portion 24b toward the first gear 16 And nine protrusions 24c penetrating the nine through holes 16d of the first gear 16 respectively. The circumferential dimension of the through hole 16d is set larger than the circumferential dimension of the protrusion 24c, and the dog-toothed ring 24 can rotate relative to the first gear 16 within the range of the dimension difference.

  The annular fixing ring 25 disposed on the side surface of the first gear 16 opposite to the hub 18 includes nine fixing holes 25a through which the nine protrusions 24c of the dog-toothed ring 24 penetrate without gaps. By attaching the circlip 26 to the clip groove 24d formed in the inner periphery of the projecting portion 24c penetrating the fixing hole 25a, the dog-toothed ring 24 and the fixing ring 25 are axially attached to the first gear 16. Locked immovably.

  Acceleration coil springs 27 and deceleration coil springs 28 are arranged at both ends in the circumferential direction of the coil spring housing recess 16e formed in the first gear 16, respectively. The fixing ring 25 includes four lid portions 25b... And the coil spring housing recesses 16e and 16e are covered with the lid portions 25b... And the acceleration coil springs 27 and 27 and the deceleration coil springs accommodated therein. The omission of 28 and 28 is prevented. The fixing ring 25 includes four spring contact portions 25c projecting from the lid portion 25b toward the first gear 16, and these spring contact portions 25c are acceleration coil springs 27, 27 and It contacts the free ends of the deceleration coil springs 28, 28.

  Two detent mechanisms 29 and 29 are provided at a position between the two coil spring housing recesses 16e and 16e of the first gear 16 with a phase difference of 180 °. The detent mechanism 29 is provided in a coil spring 30 housed in a hole 16 f formed in the first gear 16, a ball 31 urged in a direction protruding from the hole 16 f by the elastic force of the coil spring 30, and the fixing ring 25. And a recess 25d into which the ball 31 can be fitted. When the dog-toothed ring 24 and the fixing ring 25 are in the neutral position, the balls 31, 31 are fitted in the recesses 25 d, 25 d to restrict the positions of the dog-toothed ring 24 and the fixing ring 25. When the torque acts on the fixing ring 25, the balls 31, 31 compress the coil springs 30, 30 and are pushed into the holes 16 f, 16 f, whereby the dog-toothed ring 24 and the fixing ring 25 are applied to the first gear 16. The relative rotation is possible.

  A guide ring 32 is fitted to the outer periphery of the annular portion 24b of the dog-toothed ring 24, and the guide ring 32 is urged toward the hub 18 by a diaphragm spring 33 arranged between the first gear 16 and the guide ring 32. The The guide ring 32 is provided with three guide teeth 32a at intervals of 120 °, and these guide teeth 32a are axially slid on the three missing tooth portions 24e of the dog tooth 24a of the dog tooth ring 24. Fits freely. That is, three of the dog teeth 24a of the dog toothed ring 24 are replaced by three guide teeth 32a of the guide ring 32, and the guide teeth 32a are moved relative to the dog teeth 24a in the axial direction. Is possible. And the tooth tips of the guide teeth 32a of the guide ring 32 biased by the diaphragm spring 33 protrude toward the hub 18 side than the tooth tips of the dog teeth 24a of the dog tooth ring 24.

  The tooth tips of the dog teeth 24a of the ring 24 with dog teeth are pointed in a double-edged shape, but the tips of the guide teeth 32a of the guide ring 32 are pointed in a single-edged shape, and the tooth tips of the guide teeth 32a ... The distances between the two dog teeth 24a and 24a on both sides of the teeth are different (see FIG. 5). Therefore, when the tooth tips of the spline teeth 19a ... of the sleeve 19 face the tooth tips of the dog teeth 24a ... of the dog toothed ring 24, the tooth tips of the spline teeth 19a ... are not on the tooth tips of the guide teeth 32a ... opposite.

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

  First, the basic synchronization operation of the synchronization device S will be described. In FIG. 1, when the sleeve 19 is driven to the right side with respect to the hub 18 by an actuator (not shown), the load that the sleeve 19 advances is transmitted to the first blocking ring 20 via the first synchronizer spring 21. 20 is urged toward the first gear 16. When the sleeve 19 further advances, the tooth tips of the spline teeth 19a of the sleeve 19 and the tooth teeth of the dog teeth 20a of the first blocking ring 20 come into contact with each other between the inclined surfaces, and the cone surface 16g of the first gear 16 and Since the torque due to the frictional force is generated by contact with the cone surface 20b of the one blocking ring 20, the rotation of the sleeve 19 (that is, the rotation of the rotating shaft 13) is synchronized with the rotation of the first gear 16 by the torque, and the sleeve 19 These spline teeth 19a can scrape the dog teeth 20a of the first blocking ring 20.

  When the sleeve 19 further advances, the spline teeth 19a of the sleeve 19 scrape the dog teeth 20a of the first blocking ring 20 so that the sleeve 19 and the first blocking ring 20 are joined together, and the spline teeth 19a of the sleeve 19 are further joined together. The tooth tips contact the tooth tips of the dog teeth 24a of the dog toothed ring 24 between the inclined surfaces. When the sleeve 19 is further advanced, the spline teeth 19a of the sleeve 19 scrape the dog teeth 24a of the dog-toothed ring 24, and finally the spline teeth 19a of the sleeve 19 are of the dog teeth 24a of the dog-toothed ring 24. Engage with.

  As described above, even if the sleeve 19 is driven in a state where the rotating shaft 13 and the first gear 16 are relatively rotated, it is generated between the cone surface 16g of the first gear 16 and the cone surface 20b of the first blocking ring 20. The rotation of the rotary shaft 13 and the rotation of the sleeve 19 are synchronized by the frictional force, and the spline teeth 19a can be smoothly engaged with the dog teeth 24a of the dog toothed ring 24.

  The spline teeth 19a of the sleeve 19 scrape the dog teeth 20a of the first blocking ring 20, and when the sleeve 19 and the first gear 16 rotate synchronously at the same speed, the spline teeth 19a of the sleeve 19 happen to be When the tooth tips and the tooth tips of the dog teeth 24 a of the dog-toothed ring 24 are aligned in the circumferential direction, as shown in FIG. The teeth 19a may become unable to engage with the dog teeth 24a of the dog-toothed ring 24.

  However, according to the present embodiment, even if the tips of the spline teeth 19a of the sleeve 19 and the tips of the dog teeth 24a of the dog-toothed ring 24 are aligned in the circumferential direction, the spline teeth 19a of the sleeve 19 are aligned. The tooth tip of the guide ring 32 is shifted in the circumferential direction with respect to the tooth tip of the guide tooth 32a of the guide ring 32, and the tooth tip of the guide tooth 32a of the guide ring 32 is that of the dog tooth 24a of the dog tooth ring 24. Since the protrusion of the hub 18 side of the tooth tip protrudes from the tooth tip, the tooth tip of the spline tooth 19a of the sleeve 19 comes into contact with the tooth tip of the dog tooth 24a of the dog toothed ring 24. It touches the slope of

  As a result, the guide ring 32 having the guide teeth 32a... Pressed by the spline teeth 19a of the sleeve 19 rotates, and the dog toothed ring 24 with the guide ring 32 assembled rotates with the first gear 16. As shown in FIG. 5B, a circumferential shift occurs between the tooth tips of the spline teeth 19a of the sleeve 19 and the tooth tips of the dog teeth 24a of the dog toothed ring 24, and the spline of the sleeve 19 The teeth 19a can be engaged with the dog teeth 24a of the dog toothed ring 24, and the function of the synchronizer S can be generated without any trouble.

  As shown in FIG. 5C, when the tooth tips of the spline teeth 19a ... of the sleeve 19 and the tooth tips of the guide teeth 32a ... of the guide ring 32 are aligned in the circumferential direction, the sleeve advances. The guide ring 32 having the tooth tips of the guide teeth 32a... Pushed by the tooth tips of the 19 spline teeth 19a... Retreats toward the first gear 16 side while compressing the diaphragm spring 33. The spline teeth 19a of the sleeve 19 can be engaged with the dog teeth 24a of the dog toothed ring 24 without any problem.

  As described above, when the tooth tips of the spline teeth 19a ... of the sleeve 19 and the tooth tips of the guide teeth 32a ... of the guide ring 32 are aligned in the circumferential direction, it is shown in FIG. 5 (D). As described above, since the tooth tips of the spline teeth 19a of the sleeve 19 and the tooth tips of the dog teeth 24a of the dog toothed ring 24 are always displaced in the circumferential direction, they can be engaged without any trouble.

  When the spline teeth 19a of the sleeve 19 scrape the dog teeth 24a of the dog-toothed ring 24, the rotary shaft 13 and the first gear 16 can freely rotate relative to each other, that is, the sleeve 19 and the dog-toothed ring 24 are free. The balls 31, 31 of the detent mechanism 29, 29 do not detach from the recesses 25 d, 25 d of the fixing ring 25, in other words, the dog toothed ring 24 is in a neutral position with respect to the first gear 16. While being held, the first gear 16 rotates integrally with the dog-tooth ring 24.

  Thereafter, when the first gear 16 begins to transmit torque, the balls 31 and 31 of the detent mechanisms 29 and 29 are detached from the recesses 25d and 25d of the fixing ring 25 while compressing the acceleration coil springs 27 and 27 when the vehicle is accelerated. The dog-toothed ring 24 and the fixed ring 25 rotate relative to the first gear 16 in one direction, and the protrusions 24c of the dog-toothed ring 24 are in the circumferential direction of the through-hole 16d of the first gear 16. Torque transmission in the acceleration direction is started.

  Conversely, when the vehicle is decelerating, the balls 31, 31 of the detent mechanisms 29, 29 are released from the recesses 25 d, 25 d of the fixing ring 25 while compressing the deceleration coil springs 28, 28, and the dog-toothed ring 24 and the fixing ring 25. Is rotated relative to the first gear 16 in the other direction, and the protrusions 24c of the dog-toothed ring 24 abut against the other inner edge in the circumferential direction of the through hole 16d of the first gear 16 so that Torque transmission is started.

  When the synchronizer S is released and the first gear 16 is disconnected from the rotary shaft 13, the first gear 16 does not transmit torque, so that the acceleration coil springs 27, 27 and the deceleration coil springs 28, 28 are elastic. Due to the force, the dog-toothed ring 24 returns to the neutral position with respect to the first gear 16, and the balls 31, 31 of the detent mechanisms 29, 29 are fitted into the recesses 25d, 25d.

  By the way, if the friction clutch or friction brake provided in the transmission is not completely disengaged and generates drag torque, even if the synchronization device S is disengaged, the rotating shaft 13 and the first In some cases, the one gear 16 cannot freely rotate relatively, and the relative rotation is suppressed by the drag torque.

  Specifically, as shown in FIG. 6A, after the spline teeth 19a of the sleeve 19 of the synchronizer S scrape the dog teeth 20a of the first blocking ring 20, the dog teeth of the dog toothed ring 24 are further removed. When the teeth 24a are scraped, even if the tips of the spline teeth 19a of the sleeve 19 and the teeth of the dog teeth 24a of the dog-toothed ring 24 do not come into contact with each other, the rotation shaft 13 and the first Since the gear 16 cannot freely rotate relative to each other, the spline teeth 19a of the sleeve 19 cannot smoothly separate the dog teeth 24a of the dog-toothed ring 24, and the smooth engagement of the synchronizer S is hindered. there is a possibility.

  However, according to the present embodiment, the spline teeth 19a of the sleeve 19 scrape the dog teeth 24a of the dog-toothed ring 24 in a state where the rotating shaft 13 and the first gear 16 cannot freely rotate relative to each other by drag torque. At this time, as shown in FIG. 6B, the dog toothed ring 24 rotates relative to the first gear 16 while compressing the acceleration coil springs 27, 27 or the deceleration coil springs 28, 28. The spline teeth 19a of the sleeve 19 can scrape the dog teeth 24a of the dog-toothed ring 24, and the complete engagement of the synchronizer S is ensured as shown in FIG.

  When the dog-toothed ring 24 rotates relative to the first gear 16, the balls 31, 31 of the detent mechanisms 29, 29 are pushed out from the recesses 25 d, 25 d of the fixing ring 25, and the first gear 16 and the dog-toothed ring 24 relative rotations are allowed. The direction in which the dog-tooth ring 24 rotates relative to the first gear 16 is such that the spline teeth 19a of the sleeve 19 and the dog teeth 24a of the dog-tooth ring 24 are in contact with each other on the inclined surface in the circumferential direction. Determined by contact.

  After the spline teeth 19a of the sleeve 19 scrape the dog teeth 24a of the dog-toothed ring 24 in this way, as shown in FIG. The dog-toothed ring 24 and the fixed ring 25 rotate relative to the first gear 16 in accordance with the direction of torque transmission up to a position where they abut against the other inner edge in the circumferential direction of the through-hole 16d of the first gear 16. Torque transmission between the gear 13 and the first gear 16 is started.

  As described above, the acceleration coil springs 27, 27 and the deceleration coil springs 28, 28 are accommodated in the spring accommodating recesses 16e, 16e formed in the disk portion 16b of the first gear 16, and the lid portion 25b of the fixing ring 25 ... Therefore, the radial coil dimensions and the axial dimension of the synchronizer S can be reduced by arranging them compactly inside the first gear 16 and the acceleration coil springs 27, 27 and the deceleration coil springs 28, 28. .

  Further, the dog-tooth ring 24 is stabilized between the disk portion 16b of the first gear 16 and the fixed ring 25 in the neutral position against the urging force of the acceleration coil springs 27, 27 and the deceleration coil springs 28, 28. Since the detent mechanisms 29 and 29 are provided to keep the same, the phase of the first gear 16 and the phase of the dog-toothed ring 24 are always kept in a constant relationship, so that the synchronization device S can be operated more stably. .

  The embodiments of the present invention have been described above, but various design changes can be made without departing from the scope of the present invention.

  For example, in the embodiment, the acceleration coil spring 27 and the deceleration coil spring 28 are provided, but both functions of the acceleration coil spring 27 and the deceleration coil spring 28 are provided by compression and tension of the common coil spring. May be allowed.

13 Rotating shaft 16 First gear (gear)
16a Boss part 16b Disk part 16c Gear tooth 16d Through-hole 16e Spring accommodation recessed part 18 Hub 19 Sleeve 19a Spline tooth 20 1st blocking ring (blocking ring)
20a Dog teeth of the first blocking ring (dog teeth of the blocking ring)
24 Dog-toothed ring 24a Dog-toothed tooth 24c of dog-toothed ring Projection 25 Fixing ring 25b Lid 25d Spring contact part 26 Circlip (fixing means)
27 Coil spring for acceleration (coil spring)
28 Coil spring for deceleration (coil spring)
29 Detent mechanism

Claims (2)

A gear (16) supported rotatably on the rotating shaft (13), and a dog tooth ring having a dog tooth (24a) on the outer periphery and supported on the gear (16) so as to be relatively rotatable by a predetermined angle ( 24), a hub (18) coupled to the rotating shaft (13), a sleeve (19) splined to the hub (18) so as to be axially slidable, and an inner circumference of the sleeve (19) A dog tooth (20a) that can be engaged with the spline teeth (19a) on the outer periphery, and is disposed between the hub (18) and the gear (16) to enable frictional engagement with the gear (16). A blocking ring (20), and the spline teeth (19a) of the sleeve (19) to the dog teeth (20a) of the blocking ring (20) and the dog teeth (24a) of the dog-toothed ring (24). Meshed In Rukoto, a synchronizer for a transmission for coupling said gear (16) to said rotary shaft (13),
The gear (16) includes a boss portion (16a) supported rotatably on the rotating shaft (13), and a disk-shaped disc portion (16b) extending radially outward from the boss portion (16a). , Gear teeth (16c) formed on the outer periphery of the disk part (16b), through holes (16d) penetrating the disk part (16b), and formed in the disk part (16b) and arranged in the circumferential direction A spring housing recess (16e) for housing the coil springs (27, 28), and the dog toothed ring (24) has a circumferential width smaller than the circumferential width of the through hole (16d). And a projecting portion (24c) projecting in the axial direction, and the tip of the projecting portion (24c) is in contact with the disk portion (16b) in a state of passing through the through hole (16d). Fixing means (2 ) And the fixing ring (25) engages with the cover (25b) covering the spring housing recess (16e) and the coil springs (27, 28) to engage the dog-toothed ring (24). A transmission synchronizer, comprising: a spring contact portion (25d) that is held in a neutral position in the center in the circumferential direction.   Between the disk portion (16b) and the fixing ring (25), the dog-toothed ring (24) is stabilized at the neutral position in the center in the circumferential direction against the urging force of the coil spring (27, 28). The transmission synchronizer according to claim 1, further comprising a detent mechanism (29) for retaining the transmission.

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