JPH05223128A - Synchronizer ring - Google Patents

Abstract

PURPOSE:To improve a synchronizer ring which is used in a synchronous engaging device for gear speed changer, and prevent a conical inner periphery from coming into partial contact with a gear side conical body at the time of synchronizing. CONSTITUTION:Three cuts 3e which are open to the large diameter side edge face 3f of a synchronizer ring 3 are formed. The cuts 3e are formed, ranging from a conical inner periphery 3a to the outer periphery, at a boss part 3d. Moreover, the cuts 3e are disposed in the central part in the circumferential direction of keyways 3c each other at regular intervals in the circumferential direction. It is thus possible to improve shift feeling and durability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synchronizer ring used for a synchronous meshing mechanism of a gear type manual transmission.

[0002]

2. Description of the Related Art As shown in FIG. 5, a synchronous meshing mechanism of a gear type transmission has a transmission gear 2 which is rotatable on a main shaft 1.
To the gear side cone 2a of the synchronizer ring 3
And a hub sleeve 5 that is spline-fitted so as to be slidable in the axial direction with respect to the hub 4 fixed to the main shaft 1 during the gear shift operation.
The key 7 held by the key spring 6 between the hub sleeve 5 and the hub sleeve 5 is first pushed by the hub sleeve 5 to move in the axial direction, hit the key groove 3c of the synchronizer ring 3, and conical the synchronizer ring 3. The inner peripheral surface 3a is pressed against the gear-side conical body 2a, then the hub sleeve 5 is further moved in the axial direction, and the hub sleeve spline 5a presses a plurality of spline teeth 3b on the outer peripheral portion of the synchronizer ring 3 to synchronize the ring. The conical inner peripheral surface 3a of 3 is further pressed against the conical body 2a on the gear side to synchronize the rotational speed of the speed change gear 2 with the rotational speed of the main shaft 1 and engage the speed change gear 2 in this state. ing.

The synchronizer ring 3 has a large number (for example, 51) of spline teeth 3a on the outer periphery thereof, and each spline tooth 3a is chamfered with an oblique chamfer at the portion to which the hub sleeve spline 5a first engages during the above-mentioned synchronizing action. The surface is formed.

Further, the key groove 3c is provided in three places by dividing the circumference into three equal parts, and such a synchronizer ring is disclosed in Japanese Utility Model Publication No. 62-46910 and Japanese Utility Model Publication No. 63-1.
It is well known from Japanese Patent No. 88338.

[0005]

Since the above-mentioned conventional synchronizer ring has a relatively high rigidity,
When the conical inner peripheral surface 3a of the synchronizer ring 3 is pressed against the gear-side cone 2a, the synchronizer ring 3 as a whole hardly elastically deforms.

As a result, as shown in FIG. 6, for example, the corners of the conical inner peripheral surface 3a of the synchronizer ring 3 partially contact the gear side cone 2a, and the entire conical inner peripheral surface 3a becomes the gear side cone. There is a problem in that the gear cannot be brought into uniform contact with the entire surface 2a, the gear shifting operation cannot be performed smoothly, and the durability is poor due to wear and seizure.

Therefore, an object of the present invention is to provide a synchronizer ring which can solve such a problem.

[0008]

In order to achieve the above object, the synchronizer ring of the present invention has a notch formed from the large-diameter side end face toward the small-diameter side and communicating from the conical inner peripheral surface to the outer periphery. A plurality of them are arranged at intervals in the circumferential direction.

It is effective to dispose the notch in the circumferentially intermediate portion of the key grooves. It is preferable that the depth of the notch is 1/3 or more and 2/3 or less of the entire width of the synchronizer ring, and the width of the notch is 1/3 or more and 1 or less of the tooth groove of the spline tooth.

[0010]

[Operation] Since the notch is provided, the rigidity of the synchronizer ring is reduced, and when the conical inner peripheral surface of the synchronizer ring is pressed against the gear side cone during synchronization, the synchronizer ring elastically deforms and the conical inner peripheral surface is deformed. The surface uniformly contacts the gear side cone.

Further, in the case where the notch is arranged in the middle portion in the circumferential direction of the key grooves, the rigidity of the synchronizer ring is largely reduced by providing the notch, and the elastic deformation is evenly distributed in the circumferential direction. Since it is easy to become, it is possible to make more uniform contact.

Furthermore, if the depth of the notch is ⅓ or more and ⅔ or less of the total width of the synchronizer ring, and the width of the notch is ⅓ or more and 1 or less of the tooth space of the spline tooth, the durability is improved. Effectively acts to improve.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment shown in FIG. 1, 3 is a synchronizer ring, 3a is a conical inner peripheral surface of which a well-known screw-shaped oil groove is provided. The right side in the drawing is the large diameter side, and the left side is the small diameter side.

Reference numeral 3b designates a large number of spline teeth provided on the outer peripheral portion of the synchronizer ring 3, 3c designates three key grooves provided on the outer periphery of the small diameter side so as to equally divide the circumference, and the spline teeth 3b face the key grooves. The part to make has a missing tooth. In the embodiment, the spline 3b has a toothless portion at a portion facing the key groove 3c, but there is no problem even if the tooth is not toothless.

Reference numeral 3d denotes a boss portion formed on the large diameter side, and reference numeral 3e denotes three notches formed in the boss portion 3d, which are arranged in the central portion in the circumferential direction of the adjacent key grooves 3c. The notch 3e is formed so as to extend from the large-diameter side end surface 3f of the synchronizer ring toward the smaller diameter side and from the conical inner peripheral surface 3a of the synchronizer ring 3 to the outer periphery of the boss portion 3d.

Further, in this embodiment, as shown in FIG. 3, the depth A of the notch 3e is not less than 1/3 and not more than 2/3 of the total width B of the synchronizer ring 3, and the width C of the notch 3e is splined. It is set to 1/3 or more and 1 or less of the tooth space D of the tooth 3b.

In the above embodiment, the synchronizer ring 3
FIG. 2 shows a state in which the conical inner peripheral surface 3a is pressed against the gear-side conical body 2a of the gear 2. The presence of the notch 3e makes the synchronizer ring 3 flexible as a whole, and the conical inner peripheral surface 3a uniformly contacts the outer periphery of the gear side cone 2a.

By changing the depth A of the notch and the width C of the notch,
The result of repeating the pressing test is shown in FIG. In the figure, the number of pressings on the vertical axis is the number of pressings until the friction coefficient decreases to 0.07 or less, and the depth A and the width C of the notch are the ratio of the total width B of the synchronizer ring 3 and the spline teeth 3a. Of the tooth space D is shown by a numerical value.

As is clear from the figure, the notch depth A
Is 1/3 to 2/3 of the full width B of the synchronizer ring 3.
And the width C of the notch is 1 of the groove D of the spline tooth 3a.
In the range of / 3 to 1, the target number of times n was exceeded and good results were obtained.

The notches 3e of the boss portion 3d are not limited to those in the above embodiment, but may be provided at unequal intervals in the circumferential direction of the synchronizer ring.

[0021]

Since the synchronizer ring of the present invention is constructed as described above, since the conical inner peripheral surface is uniformly pressed against the outer periphery of the gear side cone at the time of synchronization, the surface pressure is reduced and the bite is reduced. Since the sticking phenomenon is eliminated, the shift feeling is improved.

Further, abnormal wear and seizure due to local contact are eliminated, and durability is improved.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view illustrating the operation of the present invention.

FIG. 3 is an enlarged front view of a part of the embodiment of the present invention.

FIG. 4 is a view showing a result of a durability test of a synchronizer ring.

FIG. 5 is a vertical cross-sectional view of the synchromesh device.

FIG. 6 is an enlarged cross-sectional view illustrating the operation of the conventional technique.

[Explanation of symbols]

 3 Synchronizer ring 3a Conical inner peripheral surface 3b Spline tooth 3c Key groove 3d Boss part 3e Notch 3f Large diameter end face A Notch depth B Full width of synchronizer ring C Notch width D Spline tooth groove

Claims (3)

[Claims] 1. A synchronizer ring having a plurality of notches formed from a large-diameter side end surface toward a small-diameter side and communicating from a conical inner peripheral surface to an outer periphery at circumferentially spaced intervals. 2. The synchronizer ring according to claim 1, wherein the notch is provided at an intermediate portion in the circumferential direction of the key grooves. 3. The synchronizer according to claim 1, wherein the depth of the notch is 1/3 or more and 2/3 or less of the entire width of the synchronizer ring, and the width of the notch is 1/3 or more and 1 or less of the tooth groove of the spline tooth. ring.