JPS61223355A - Synchronizer of speed change gear - Google Patents

Abstract

PURPOSE:To prevent a key from slipping out of position by interposing a shifting ring for applying initial pressure to a synchro ring between a hub sleeve and the synchro ring. CONSTITUTION:A clutch hub 11 is spline-fitted to a shaft 10, and a hub sleeve 12 is disposed on the outer peripheral portion in such a manner as to slide in the axial direction. Shifting rings 28, 29 for applying initial pressure to synchro rings 22, 23 are interposed between the synchro rings 22, 23 and the hub sleeve 12. The elastic engaging portions 30 of the shifting rings 28, 29 are disposed in such a manner as to engage with the forward end portion of a spline 13 of the hub sleeve 12, thereby to clamp the forward end portion. Thus, the shifting rings 28, 29 are adopted to prevent a key from slipping out of position.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a synchronizing device for a transmission, and more particularly to a synchronizing device for a transmission, in which synchronizing devices are arranged in the axial direction by axial sliding of a hub sleeve that is spline-fitted on the outer periphery of a clutch hub. It is related to a synchronizing device for a transmission that synchronizes the spline piece and the hub sleeve by initially pressing the synchro ring against the spline piece that is integrated with the gear.

BACKGROUND OF THE INVENTION A synchronizing device commonly used in prior art transmissions, particularly automobile transmissions, is of the Warner type. This Warner type synchronizer is also called a set of key keys.
By moving the key in the axial direction with the hub sleeve, generate an initial pressure on the synchro ring, and then press the key □ against the spring force.
／、Suke! The J-bu itself is configured to be able to slide in the axial direction. Key set synchronization - The □ position requires a spring that biases the key in the radial direction, which requires a large number of parts, and the disadvantage is that overstroke of the hub sleeve □ causes the key to pop out and cause malfunction. It is said that In order to improve this drawback, JP-A No. 5
There is a synchronizing device for a manual transmission disclosed in Japanese Patent No. 8-174725. In this synchronizer, a plurality of insert springs, which serve instead of two sets of keys and springs, are respectively fitted into a plurality of insertion holes formed along the outer circumference of the clutch hub in the axial direction. Each insert spring moves together with the hub sleeve by locking the splines of the hub sleeve with spring force, applying initial pressure to the synchro ring, and furthermore, the engaging portion of the synchro ring and the locking portion of the insert spring are engaged. Therefore, synchro ring,
Relative rotation between the hub sleeve and the hub sleeve is restricted.

Problems to be Solved by the Invention Conventional synchronizers use an insert spring instead of the Warner type key and spring to eliminate the key popping out phenomenon caused by clutch hub overstroke and to reduce the number of parts compared to the Warner type. It can be said that the ease of assembly has also been improved to some extent.

However, on the other hand, conventional synchronizers require a large hole in the clutch hub to insert the insert spring, which inevitably weakens the strength of the clutch hub, so it is necessary to increase the axial length to strengthen the clutch hub. A new problem has arisen: Furthermore, although conventional synchronizers have been improved in terms of reducing the number of parts and ease of assembly, they are not sufficient.

Moreover, the structure of the insert spring and the synchro ring therefor tends to become complicated.

The present invention has been made to solve the above problems,
The object is to provide a synchronizing device for a transmission that has a simple structure, eliminates the phenomenon equivalent to a key popping out, and further reduces the number of parts and improves ease of assembly.

Means for Solving the Problems The present invention achieves the above object by interposing a shift ring between the hub sleeve and the synchro ring in the conventional synchronizer in place of the key and spring. The shift ring has a ring shape around the shaft, restricts the relative rotational position between it and the clutch hub, and is movable in the axial direction.The shift ring has an elastic lock that engages with the spline tip of the hub sleeve. It is characterized by having a part. The elastic locking portion has a structure that allows the spline to move in the axial direction through elastic deformation.

Operation: When the shift fork is operated, the hub sleeve that is spline-fitted on the outer periphery of the clutch hub slides in the axial direction, and along with this sliding, the shift ring engages with the spline tip of the hub sleeve. move in the same direction due to
It contacts the synchro ring and applies initial pressure. This initial pressure causes the synchronizer ring to come into frictional contact with the spline piece that is integrated with the gear, thereby achieving torque transmission.

By restricting the rotation of the synchronizer ring, the rotation of the clutch hub is reduced relative to the spline piece, and the hub sleeve is further enabled to slide in the axial direction. The hub sleeve advances by overcoming the elastic force of the elastic locking portion, and the spline chamfer of the hub sleeve engages a portion of the spline chamfer 4 of the synchro ring, thereby achieving synchronization between the two. Upon completion of synchronization, the relative rotation between the spline piece and the synchro ring disappears, and the hub sleeve further slides in the axial direction, moving the synchro ring in the opposite direction to the initial synchronization rotation direction, completing the meshing relationship with the spline piece. .

Example An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of the synchronizer according to the present invention, and the second
The figure is an enlarged view of the main parts. A clutch hub 11 is spline-fitted to the shaft 10, and a hub sleeve 12 is further fitted with a spline 13 at the outer peripheral portion thereof so as to be slidable in the axial direction. Gears 14 and 15 are supported by the shaft 10 via bearings on both sides of the clutch hub 11, and each gear 14 and 15 has spline pieces 16 and 17 that mesh with the hub sleeve 12 and are integrally configured and symmetrical. It is located. Each spline piece 16.17 has a hub sleeve 12
It has a spline 18.19 that engages with the spline 13 on the outer periphery at the same height as the spline 13 position, and a cone-shaped friction surface 20.21 at a lower position. A synchro ring 22 is attached to the outer periphery of each cone-shaped friction surface 20.21.
．． 23 is located. The synchronizer ring 22.23 has a tapered friction surface 24.25 that comes into contact with the cone-shaped friction surface 20.21 by axial movement, and also has a tapered friction surface 24.25 on a part of the outer circumference at the same height as the line 94213 of the hub sleeve 12. It has splines 26,27 that mesh with splines 13. Shifting rings 28 and 29 are interposed between the synchro rings 22 and 23 and the hub sleeve 12 to provide initial suppression to the synchro rings 22 and 23. Each shifting ring 28.29 is a synchro ring 22.2
It is loosely fitted in a ring shape at the outer periphery one step lower than the spline 26 and 27 positions of No. 3, and can be moved in the axial direction.

Furthermore, each shifting ring 28, 29 has elastic locking portions 30.30 at equal positions on the circumference, as shown in FIG. It has... Each elastic locking portion 30 is formed by bending a portion of the shifting ring 28, 29 in a radially outward direction to form a concave shape similar to the cross-sectional shape of a channel. Each elastic locking portion 30 is arranged at a position where it engages with the tip end of the spline 13 of the hub sleeve 12.

The tip is clamped in the gap formed by the free end. The free end of the elastic locking portion 30 is elastically deformed, thereby widening the gap and allowing the spline 13 to slide in the axial direction. The synchro rings 22, 23 are initially pressed by the gear 15, 16 side end surfaces of the shifting rings 28, 29 coming into contact with the stepped portions 31, 32.

Clutch hub 11. The shifting rings 28, 29 and the synchronizer rings 22, 23 have a certain relationship as shown in FIG. , and the grooves 37 of the synchro rings 22, 23' engage with each other, thereby restricting relative rotation to each other.

In addition, as shown in the developed view of Fig. 4, each of the spline pieces 13°26, 27,
18 and 19 so that synchronization and gear changes can be performed smoothly. The spline 13 of the hub sleeve 12 is 3 along the entire circumference.
Consisting of two configurations, one is a shifting ring 28.2
The spline 13a engages with the elastic locking portion 30 of 9.
Yes.

This spline 13a has the shortest length in the axial direction and has an acute tip end. The second configuration is the spline 13b that initially engages with the spline 26.27 of the synchro ring 22.23.

This spline 13b is formed with a large chamfer angle α at its tip to increase the synchronizing force with the splines 18 and 19. In the third configuration, the spline 13c has the longest axial length, and lines 26 and 27 are not formed at that position by the synchro ring 22 and 23, and each spline 18 and 19 of the spline pieces 16 and 17 are directly connected to each other. It has an interlocking relationship.

This spline 13c has a chamfer angle β at its tip that is smaller than the chamfer angle α of the second configuration in order to minimize the meshing resistance with the splines 18 and 19.

Now that the configuration has been explained above, the operation will be described next. For convenience of explanation, it is assumed that the hub sleeve 12 is slid to the left in the figure in the shift oak. As the hub sleeve 12 slides to the left, the shifting ring 29, which has an elastic locking part 30 that engages with the tip of the spline 13a, also moves to the left, and its end surface abuts the stepped part of the synchro ring 23. Move the synchro ring 23 to the left. The tapered friction surface 25 of the synchro ring 23 is connected to the spline piece 17
contact with the cone-shaped friction surface 21 of , with initial compression.

Torque is exchanged between both surfaces 25 and 21.

When the synchro ring 23 rotates a small amount, the rotation is restricted by the protrusion 33 of the clutch hub 11.
Clutch hub 11 rotates in the same direction. Face 125.
21 pressure increases as the hub sleeve 12 slides further to the left, and the rotational difference between the two is reduced. When the spline 13a of the hub sleeve 12 bends the free end of the elastic locking part 30 and slides further to the left, the tip of the spline 13b engages with the spline 27 of the synchronizer ring 23 and synchronizes. . When the synchronization is completed, the relative rotation between the spline piece 17 and the synchronizer ring 23 disappears.

The hub sleeve 12 further slides to the left while slightly rotating the synchro ring 23 in the opposite direction, and the spline 13
The tip of the gear c first engages with the spline 19 of the spline piece 17, then the spline 13b, and then the spline 13a engages with the spline 19, completing the gear change.

Effects of the Invention According to the present invention, a shifting ring which has a simple structure and fulfills its role as a substitute for a warner-type key and spring is used, so a phenomenon such as a key popping out does not occur, and the shifting ring is Since no insertion hole is required for assembly, sufficient strength of the clutch hub can be ensured and the axial length can be shortened. Further, according to the present invention, the number of parts is smaller than that of conventional devices, and it is easy to assemble two parts.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is an enlarged sectional view of the main part of FIG. 1, FIG. FIG. 4 is an exploded view showing the relationship between the hub sleeve, synchro ring, splines of the spline piece, and the shifting ring. 11...Clutch hub, 12...Hub sleeve 13
．． 13a, 13b, 13e, 1B, 19.26.27・
...Spline 14.15...Gear, 16
．． 17... Spline piece 20.21, 24.25
...Friction surface, 22.23... Synchro ring 2.
8, 29...Shifting ring, 30...Elastic locking part 33...Protrusion, 35...Notch part 37...Concave groove

Claims (1)

[Claims] The synchronizer rings arranged in the axial direction are initially pressed by the spline piece, which is integrally formed with the gear, by the axial sliding of the hub sleeve that is fitted with the spline on the outer periphery of the clutch hub, and the connection between the spline piece and the hub sleeve is In a synchronizing device for a transmission that synchronizes, a shift ring that initially presses the synchro ring is interposed between the hub sleeve and the synchro ring, and the shift ring has a ring shape around an axis, and has a shape between the hub sleeve and the synchro ring. The shift ring has an elastic locking part that engages with the spline tip of the hub sleeve, and the elastic locking part restricts the axial movement of the spline. A synchronizing device for a transmission, characterized in that it allows elastic deformation.