JP2015169278A - synchromesh device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a synchromesh device capable of suppressing collision noise in comparison to conventional ones.SOLUTION: A synchromesh device 10 includes a transmission gear 14, a synchronization hub 16, a synchronization sleeve 18, a synchronization cone 15, and a blocking ring 24. In the synchronization hub 16 and blocking ring 24, a recess part 37 and a salient part 42, engaged in a relatively rotatable manner only within a predetermined range, are provided respectively. Between the recess part 37 and the salient part 42, a plate spring part 50 extending from the salient part 42 toward the recess part 37 is provided. The tip of the plate spring part 50 comprises a free end capable of being freely oscillated.

Description

  The present invention relates to a synchronous meshing device used for a transmission or the like.

  Conventionally, a transmission gear that has dog teeth on the outer periphery and is rotatably supported on the rotating shaft, a synchro hub that is fixed to the rotating shaft, and an outer periphery of the synchro hub that is slidably connected in the axial direction. The synchro sleeve, the synchro cone which is connected to the transmission gear so as not to rotate relative to the synchro sleeve, and the dog teeth which can be engaged with the spline teeth formed on the inner peripheral surface of the synchro sleeve, and the friction engagement with the synchro cone. There is known a synchronous meshing device (synchrome mesh mechanism) of a transmission including a blocking ring arranged between a synchro hub and a transmission gear (see, for example, Patent Document 1).

  In the thing of patent document 1, a convex part is formed in the outer peripheral surface of a blocking ring, a recessed part is formed in the inner peripheral surface of a synchro hub corresponding to a convex part, and a synchro hub and a blocking ring are formed with this convex part and a concave part. The engaging mechanism is configured to restrict the relative rotation of the motor to a predetermined range.

  In addition, a buffer portion is provided between the convex portion and the concave portion, and a corresponding portion of the key spring is bent into a rectangular shape.

  In addition, it is also known that a friction member is provided on a side surface of the synchro hub so as to be slidable, and the friction member engages with a convex portion of the blocking ring to thereby provide a buffering action between the concave portion and the convex portion by friction force. (For example, refer to Patent Document 2).

Japanese Patent No. 4729451 JP-A-6-159388

  In the synchronous meshing device of Patent Document 1, there is a problem that the performance of suppressing a collision sound by the buffer portion bent in a rectangular shape is relatively low. Further, in the synchronous meshing device of Patent Document 2, the frictional force between the synchro hub and the blocking ring increases, and there is a problem that the load when the syncline sleeve spline teeth scrape the blocking ring dog teeth increases. .

  In view of the above, an object of the present invention is to provide a synchronous meshing device that has improved collision noise suppression performance than before without increasing the scraping load.

[1] In order to achieve the above object, the present invention provides:
A transmission gear that has dog teeth on the outer periphery and is rotatably supported relative to the rotation shaft;
A synchro hub fixed to the rotating shaft;
A sync sleeve that is splined to the outer periphery of the sync hub so as to be axially slidable;
A synchro cone disposed between the sync hub and the transmission gear, and provided so as not to rotate relative to the transmission gear;
The outer peripheral surface has dog teeth that can be engaged with spline teeth formed on the inner peripheral surface of the synchro sleeve, and can be frictionally engaged with the synchro cone and disposed between the sync hub and the transmission gear. With a blocking ring,
In the synchronous meshing device of the transmission provided with a recess and a projection configured to be engaged with the synchro hub and the blocking ring so as to be rotatable by a predetermined range,
The concave portion is provided with a leaf spring portion extending toward the convex portion,
The convex portion is provided with a receiving portion that receives the tip of the leaf spring portion,
The front end of the leaf spring is a free end that can freely swing,
The leaf spring portion and the receiving portion are configured such that a front end portion of the leaf spring portion contacts the receiving portion before the convex portion contacts the concave portion.

  According to the present invention, unlike the prior art, the buffer portion is not formed by bending the corresponding portion of the key spring into a rectangular shape. And the front-end | tip of a leaf | plate spring part is a free end which can rock | fluctuate freely. Thereby, the synchronous meshing apparatus of this invention can improve the buffering performance of a leaf | plate spring part, and can improve the suppression performance of the collision sound of a convex part and a recessed part rather than before.

  Moreover, the leaf | plate spring part of this invention is fixed to a recessed part. For this reason, according to the present invention, there is no possibility that the scraping load increases due to the frictional force as in the prior art.

  [2] In the present invention, a plurality of recesses and projections are provided at intervals in the circumferential direction of the synchro hub and the blocking ring, and a plurality of leaf springs are provided corresponding to the plurality of recesses. A plurality of leaf spring portions can be integrally formed via an annular portion disposed between the synchro hub and the blocking ring.

  According to such a configuration, the plurality of leaf spring portions are configured by one member via the annular portion. Therefore, it becomes easy to attach a plurality of leaf springs to the sync hub, and the assembly of the synchronous meshing device is simplified.

  [3] In the present invention, a plurality of recesses and projections are provided at intervals in the circumferential direction of the synchro hub and the blocking ring, and a plurality of leaf springs are provided corresponding to the plurality of recesses. The plurality of leaf spring portions can be configured separately from each other.

  According to such a configuration, the leaf spring portion can be easily applied even in different types of synchronous meshing devices having different radial dimensions or different numbers of concave portions and convex portions. For this reason, according to the synchronous meshing apparatus of this invention, the versatility of a leaf | plate spring part can be improved, and the manufacturing cost in the case of manufacturing a multiple types of synchronous meshing apparatus can be held down.

The perspective view which decomposes | disassembles and shows typically the synchronous meshing apparatus of 1st Embodiment of this invention. Sectional drawing which shows the synchronous meshing apparatus of 1st Embodiment. FIG. 3A is an explanatory view showing a leaf spring portion of the first embodiment. FIG. 3B is an explanatory view showing FIG. 3A in an exploded state. FIG. 4A is an explanatory view showing the leaf spring portion of the first embodiment from the axial direction. FIG. 4B is an enlarged perspective view showing the leaf spring portion. FIG. 5 is an explanatory view showing an operating state of the leaf spring portion when the concave portion and the convex portion of the synchronous meshing device of the first embodiment collide with each other. FIG. 5A is an explanatory view showing a state in which the leaf spring portion and the receiving portion are in contact with each other. FIG. 5B is an explanatory diagram illustrating a state in which the concave portion and the convex portion are in contact with each other. FIG. 5C is an explanatory diagram illustrating a state where the leaf spring portion and the receiving portion are not in contact with each other. FIG. 6A is a perspective view showing a concave portion of the synchronous meshing device of the second embodiment of the present invention. FIG. 6B is a perspective view showing a leaf spring portion of the second embodiment. It is explanatory drawing which shows the operation state of a leaf | plate spring part when the recessed part and convex part of the synchronous meshing apparatus of 2nd Embodiment collide. FIG. 7A is an explanatory diagram illustrating a state in which the leaf spring portion and the receiving portion are in contact with each other. FIG. 7B is an explanatory diagram illustrating a state where the concave portion and the convex portion are in contact with each other. FIG. 7C is an explanatory view showing a state where the leaf spring portion and the receiving portion are not in contact with each other. It is explanatory drawing which shows the operating state of a leaf | plate spring part when the recessed part and convex part of the synchronous meshing apparatus of other embodiment of this invention collide. FIG. 8A is an explanatory view showing a state in which the leaf spring portion and the receiving portion are in contact with each other. FIG. 8B is an explanatory diagram illustrating a state in which the concave portion and the convex portion are in contact with each other. FIG. 8C is an explanatory view showing a state where the leaf spring portion and the receiving portion are not in contact with each other. Explanatory drawing which shows typically the synchronous meshing apparatus of a reference example.

[First embodiment]
With reference to FIG. 1 to FIG. 5, a synchronous meshing device for a transmission according to a first embodiment will be described. The synchronous meshing device 10 has a dog gear 12 on the outer periphery, a transmission gear 14 supported on a rotation axis X (main shaft, counter shaft, etc.) via a bearing 31 (see FIG. 2) and a relative rotation. A synchro hub 16 splined to the shaft X, a synchro sleeve 18 splined to the synchro hub 16 so as to be movable in the axial direction, and a dog tooth meshable with a spline tooth 20 formed on the inner periphery of the synchro sleeve 18 A blocking ring 24 disposed between the synchronizing hub 16 and the transmission gear 14 so as to be frictionally engaged with the synchronizing cone 15 rotating integrally with the transmission gear 14, and the blocking ring 24 and the synchronization sleeve. 18 and a sync spring 26 disposed between them.

  The transmission gear 14 has a through hole through which the bearing 31 and the rotation shaft X are inserted. A tapered cylindrical synchro cone 15 projects from one side of the transmission gear 14 in the axial direction (left side in FIGS. 1 and 2). Dog teeth 12 are formed on the outer peripheral surface of the synchro cone 15 on the transmission gear 14 side. The synchro cone 15 is frictionally engaged with the inner peripheral surface of the blocking ring 24.

  An outer peripheral portion 16 a is formed on the outer peripheral edge of the synchro hub 16 so as to extend in the axial direction. The outer peripheral portion 16 a is fixed to the rotation axis X via the coupling body 34. Spline teeth 36 are formed on the outer periphery of the outer peripheral portion 16 a of the synchro hub 16. In addition, a plurality (three in the present embodiment) of concave portions 37 are formed at equal intervals in the circumferential direction at the end portion on the other axial side of the outer peripheral portion 16a (the right end portion in FIGS. 1 and 2). .

  The sync sleeve 18 is formed in a cylindrical shape. An engaging portion 38 that can be engaged with a fork (not shown) is provided on the outer periphery of the synchro sleeve 18.

  The blocking ring 24 is formed in a cylindrical shape. An end of the outer peripheral surface of the blocking ring 24 on one axial side (the left end in FIGS. 1 and 2) is fitted (engaged) with the recess 37 of the synchro hub 16 so as to be relatively rotatable within a predetermined range. The convex part 42 to be formed is formed. The inner peripheral surface of the blocking ring 24 can be frictionally engaged with the outer peripheral surface of the synchro cone 15 that rotates integrally with the transmission gear 14.

  In the present embodiment, the predetermined range is set to a half pitch of the dog teeth 22 (half the distance from the center of the dog teeth 22 to the center of the adjacent dog teeth 22). As a result, the blocking ring 24 can rotate relative to the sync hub 16 by a half pitch of the dog teeth 22.

  The sync spring 26 is formed in an annular shape. The synchronization spring 26 presses the blocking ring 24 against the synchronization cone 15 as the synchronization sleeve 18 moves toward the transmission gear 14 in the axial direction.

  On the other end face in the axial direction of the outer peripheral portion 16a of the synchro hub 16 (the end face on the right side in FIGS. 1 and 2), an annular portion 52 formed by punching a single metal plate in an annular shape is disposed. The annular portion 52 is provided with a U-shaped cut 54 a that is cut in a substantially U shape so as to correspond to the concave portion 37. Then, the tongue piece 54 defined by the U-shaped cut 54a is bent at a right angle toward the concave portion 37 (in a direction away from the convex portion 42). Both circumferential edges of the tongue piece 54 are in contact with both circumferential sides of the recess 37. Due to the fitting of the tongue piece 54 and the recess 37, the synchro hub 16 and the annular portion 52 rotate integrally, and the two cannot be rotated relative to each other.

  As shown in FIG. 4, the annular portion 52 has a straight cut 50a cut from one of the two corners of the U-shaped cut 54a toward the outer edge in the radial direction. Is formed. By bending the portion defined by the straight cut 50a, the U-shaped cut 54a, and the outer peripheral edge of the annular portion 52 from the center toward the convex portion 42 of the blocking ring 24, the L-shaped cross section is obtained. The leaf spring portion 50 of the first embodiment is configured.

  The convex portion 42 provided on the blocking ring 24 is provided with a receiving portion 44 that can receive the distal end portion of the leaf spring portion 50. The receiving portion 44 is configured by a V-shaped groove, and is configured such that the leaf spring portion 50 contacts the receiving portion 44 before the convex portion 42 contacts the concave portion 37. In other words, when the leaf spring portion 50 and the receiving portion 44 are in contact with each other, the leaf spring portion 50 and the receiving portion 44 are configured such that there is a gap between the convex portion 42 and the concave portion 37 in the circumferential direction.

  The three leaf spring portions 50 are elastic bodies having spring elasticity, and are made of, for example, stainless steel. The distal end portion of the leaf spring portion 50 is configured as a free end that can freely swing. The leaf spring portion 50 is obtained by obtaining the maximum rotational energy from the maximum fluctuation amount of the rotational speed of the drive source and the moment of inertia of the blocking ring 24 when the vehicle is idling and when the vehicle is running. The required elastic force is set based on the maximum rotational energy.

  Further, as a method of manufacturing the leaf spring portion 50, the annular portion 52 and the tongue piece 54, first, a single metal plate is punched in an annular shape, and a U-shaped cut 54a and a straight cut 50a are formed in the punched annular member. Form. Thereafter, as shown in FIG. 4B, the leaf spring portion 50 connected to the annular portion 52 can be easily manufactured by bending the tongue piece 54 and the leaf spring portion 50.

  Next, the operation of the transmission synchronous meshing device 10 will be described. A state in which the sync sleeve 18 is located at the center of the sync hub 16 is defined as a neutral state.

  First, when the synchronization sleeve 18 starts moving from the neutral state toward the transmission gear 14, the spline teeth 20 of the synchronization sleeve 18 press the synchronization spring 26, and the synchronization cone 15 and the blocking ring 24. Friction occurs between them. Then, the spline teeth 20 of the synchro sleeve 18 come into contact with the dog teeth 22 of the blocking ring 24.

  When the rotation of the blocking ring 24 and the synchro cone 15 synchronizes, the spline teeth 20 of the synchro sleeve 18 move between the adjacent dog teeth 22 of the blocking ring 24 by the force of moving the synchro sleeve 18 toward the transmission gear 14 side. The blocking ring 24 rotates with respect to the sync sleeve 18 so as to enter between them. Then, the spline teeth 20 of the synchro sleeve 18 move toward the transmission gear 14 so as to scrape between the dog teeth 22 of the blocking ring 24.

  Then, the spline teeth 20 of the synchro sleeve 18 that have separated the dog teeth 22 come into contact with the dog teeth 12 of the transmission gear 14. The spline teeth 20 of the synchro sleeve 18 mesh with the dog teeth 12 of the transmission gear 14 so that the dog teeth 12 of the transmission gear 14 are also scraped.

  According to the synchronous meshing device 10 of the first embodiment, unlike the prior art, the buffer portion is not formed by bending the corresponding portion of the key spring into a rectangular shape. And the front-end | tip of the leaf | plate spring part 50 is a free end which can rock | fluctuate freely. As a result, in the synchronous meshing device 10 of the first embodiment, the leaf spring portion 50 can swing more easily than before, and the buffering performance of the leaf spring portion 50 can be improved. The performance of suppressing the collision sound with 37 can be improved.

  Moreover, since the receiving part 44 is formed in V shape, it acts on the leaf | plate spring part 50 from the inclined surface of the V-shaped receiving part 44, so that the convex part 42 approaches the side wall of the recessed part 37 (refer FIG. 5B). The force to the side of the axial direction surface of the convex part 42 to become strong becomes strong. Therefore, the frictional force between the blocking ring 24 and the synchro cone 15 increases as the convex portion 42 approaches the side wall of the concave portion 37. Therefore, the convex part 42 will collide comparatively slowly with the side wall of the concave part 37, and it can improve the further suppression performance of a collision sound.

  When the rotation speeds of the blocking ring 24 and the synchro cone 15 are synchronized, the spline teeth 20 of the synchro sleeve 18 move toward the transmission gear 14 so as to scrape between the dog teeth 22 of the blocking ring 24. . At this time, as shown in FIG. 5C, the convex portion 42 of the blocking ring 24 tends to move to the center of the concave portion 37 of the synchro sleeve 18 by the restoring force of the leaf spring portion 50. Thereby, the scraping load required when the spline teeth 20 of the synchro sleeve 18 scrape between the dog teeth 22 of the blocking ring 24 is reduced.

  Further, some conventional synchronous meshing devices are provided with a slidable friction member on the side surface of the synchro hub and provide a buffering action between the convex portion and the concave portion by frictional resistance. However, according to the synchronous meshing device of the present embodiment, since the friction force is not used, the scraping load required when scraping between the spline teeth 20 of the synchro sleeve 18 and the dog teeth 22 of the blocking ring 24 is increased. Thus, the spline teeth 20 of the synchro sleeve 18 can be smoothly meshed with the dog teeth 12 of the transmission gear 14.

  In addition, in the synchronous meshing apparatus 10 of 1st Embodiment, the recessed part 37 was formed in the synchro hub 16, and what formed the convex part 42 in the blocking ring 24 was demonstrated. However, the concave and convex portions of the present invention are not limited to this. For example, even if the concave portion is formed in the blocking ring and the convex portion is formed in the synchro hub, the present invention can be applied to obtain the effect.

[Second Embodiment]
Next, with reference to FIG.6 and FIG.7, the synchronous meshing apparatus 10 of 2nd Embodiment of this invention is demonstrated. FIG. 6A is a partial cross-sectional view showing a part of the synchro hub 16 in an enlarged manner.

  The synchronous meshing device 10 of the second embodiment has the same configuration as that of the first embodiment except that the annular spring portion is not provided and the shapes of the leaf spring portion 50 and the receiving portion 44 are different. The description is omitted.

  As for the recessed part 37 of 2nd Embodiment, the connection body 34 located in the radial inside is formed in the cross-section T shape. The base end of the leaf spring portion 50 of the second embodiment is provided with a C-shaped fixing portion 56 that is fixed to the connecting body 34 so as to wrap the outer edge of the connecting body 34 having a T-shaped cross section.

  As shown in FIG. 6B, the leaf spring portion 50 of the second embodiment forms a plate plane perpendicular to the plate plane of the fixed portion 56 by twisting 90 degrees at the base end portion. In addition, the formation method of the leaf | plate spring part 50 of 2nd Embodiment is not restricted to this. For example, the fixing portion 56 may be configured to be bent from a portion covering the side surface of the connecting body 34 having a T-shaped cross section.

  The receiving part 44 is configured by a U-shaped groove. Both side surfaces in the circumferential direction of the receiving portion 44 with which the tip of the leaf spring portion 50 abuts are inclined surfaces. Thereby, also in the synchronous meshing apparatus 10 of 2nd Embodiment, like the receiving part 44 of 1st Embodiment comprised by V-shaped groove | channel, as the convex part 42 approaches the side wall of the recessed part 37, the blocking ring 24 and The frictional force with the synchro cone 15 increases. Therefore, the convex part 42 will collide comparatively slowly with the side wall of the concave part 37, and it can improve the further suppression performance of a collision sound.

[Other Embodiments]
Although it is not possible to further improve the performance of suppressing the collision noise, both the circumferential side surfaces of the receiving portion 44 constituted by U-shaped grooves are parallel to the axial direction of the rotation axis X as shown in FIG. Even when configured, the leaf spring portion 50 and the receiving portion 44 are configured such that when the leaf spring portion 50 and the receiving portion 44 come into contact with each other, the convex portion 42 and the concave portion 37 have a gap in the circumferential direction. As long as the effect of the present invention, that is, suppression of collision noise can be obtained.

  Further, in the synchronous meshing device 10 of the first and second embodiments, the synchro sleeve 18 presses the blocking ring 24 via the sync spring 26 and increases the frictional force between the blocking ring 24 and the synchro cone 15. In the above description, the synchronization hub 16 and the transmission gear 14 are synchronized. However, the synchronous meshing device of the present invention is not limited to this.

  For example, as shown in FIG. 9 as a reference example, the leaf spring portion and the receiving portion of the present invention are also applied to a key type synchronous meshing device including a sync key 86 pressed against the sync sleeve 18 by a spring 80. Can do. In this case, the design of the concave portion 37 may be appropriately changed so that the leaf spring portion 50 of the present invention can be disposed.

DESCRIPTION OF SYMBOLS 10 Synchronizing gear 12 Dog tooth 14 Transmission gear 15 Synchro cone 16 Synchro hub 16a Outer peripheral part 18 Synchro sleeve 20 Spline tooth 22 Dog tooth 24 Blocking ring 26 Synchro spring 31 Bearing 34 Connection body 36 Spline tooth 37 Recess 38 Engagement part 42 Convex Part 44 receiving part 50 leaf spring part 50a linear cut 52 annular part 54 tongue piece 54a U-shaped cut 56 fixing part 80 spring 86 synchro key X rotation axis

Claims (3)

A transmission gear that has dog teeth on the outer periphery and is rotatably supported relative to the rotation shaft;
A synchro hub fixed to the rotating shaft;
A sync sleeve that is splined to the outer periphery of the sync hub so as to be axially slidable;
A synchro cone disposed between the sync hub and the transmission gear, and provided so as not to rotate relative to the transmission gear;
The outer peripheral surface has dog teeth that can be engaged with spline teeth formed on the inner peripheral surface of the synchro sleeve, and can be frictionally engaged with the synchro cone and disposed between the sync hub and the transmission gear. With a blocking ring,
In the synchronous meshing device of the transmission provided with a recess and a projection configured to be engaged with the synchro hub and the blocking ring so as to be rotatable by a predetermined range,
The concave portion is provided with a leaf spring portion extending toward the convex portion,
The convex portion is provided with a receiving portion that receives the tip of the leaf spring portion,
The front end of the leaf spring is a free end that can freely swing,
The plate spring portion and the receiving portion are configured such that a front end portion of the plate spring portion contacts the receiving portion before the convex portion contacts the concave portion. Meshing device. It is a synchronous meshing device of the transmission according to claim 1,
A plurality of the concave portions and the convex portions are provided at intervals in the circumferential direction of the synchro hub and the blocking ring,
A plurality of the leaf springs are provided corresponding to the plurality of recesses,
A plurality of the leaf spring portions are integrally configured through an annular portion disposed between the sync hub and the blocking ring. It is a synchronous meshing device of the transmission according to claim 1,
A plurality of the concave portions and the convex portions are provided at intervals in the circumferential direction of the synchro hub and the blocking ring,
A plurality of the leaf springs are provided corresponding to the plurality of recesses,
The synchronous meshing device for a transmission, wherein the plurality of leaf spring portions are configured separately from each other.