JPH0478845B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a method for machining an inner ring groove of a transmission synchronization mechanism.

(b) Prior Art A conventional synchronizing mechanism for a transmission is disclosed in, for example, Japanese Patent Application Laid-Open No. 59-208227. The synchronizing mechanism of the transmission shown here is configured to synchronize the rotations of the synchro hub and the gear by the action of a conical clutch between the inner conical surface of the synchronizing ring and the outer conical surface of the gear. .

(c) Problems to be Solved by the Invention The conventional synchronizing mechanism of a transmission as described above has a limited synchronizing performance because it can only obtain a synchronizing action using one conical clutch. For this reason,
In Japanese Patent Application No. 60-191267, the present applicant has constructed a synchronous ring with an inner ring and an outer ring, and the conical ring is sandwiched between the outer conical surface of the inner ring and the inner conical surface of the outer ring. A synchronizing mechanism for a transmission that obtains synchronizing action using two conical clutches has been disclosed. This greatly improves synchronization performance.However, this synchronization mechanism also has the problem that manufacturing the inner ring is troublesome and increases the manufacturing cost. In other words, the contact end surface of the groove of the inner ring with the pawl of the outer ring is inclined so as to generate an axial force when a rotational force is applied, but this contact end surface can be formed by forging. The shape makes it impossible to do so. This is because the outer conical surface of the inner ring has a larger diameter than this groove, and the forging die cannot enter into the groove. Therefore, machining of the grooves requires cutting, which requires a large amount of machining cost. The present invention aims to solve these problems.

(d) Means for solving the problem The present invention enables a forging die for machining the inner ring groove to enter through an axial lubricating oil groove provided on the outer conical surface of the inner ring. This solves the above problems. That is, the lubricating oil grooves 52 and 54 provided in the axial direction on the outer diameter conical surface 24a of the inner ring 24 and the contact end surfaces 56 and 58 of the inner ring groove portion 24b are arranged at the same circumferential position, and the groove portion The contact end surface of the groove is machined by entering the forging die 60 through the lubricating oil groove from the side axially opposite to the side where the contact end surface is arranged. Note that the inside brackets indicate corresponding members of the embodiments described later.

(E) Function Since the lubricating oil groove provided on the outer conical surface of the inner ring and the contact end surface of the groove are provided at the same circumferential position, the forging die passes through the lubricating oil groove and forms the groove. can reach up to the contact end surface. This allows the inner ring to be formed by forging.

(F) Embodiments Examples of the present invention will be described below with reference to FIGS. 1 to 8 of the accompanying drawings.

As shown in FIG. 1, a gear 14 is rotatably supported on a rotating shaft 10 via a bearing 12. As shown in FIG. The gear 14 is provided with a clutch gear 16 that is spline-coupled to the gear and rotates integrally therewith. Clutch gear 16 has spline 1 on the outer diameter
6a. A synchro hub 18 spline-coupled to rotate together with the rotating shaft 10 has a spline 18a on its outer diameter, to which a coupling sleeve 20 is coupled movably in the axial direction. A synchronizing ring 22 is provided between the clutch gear 16 and the synchronizing hub 18. The synchronous ring 22 is composed of an inner ring 24 and an outer ring 26. inner ring 24
As shown enlarged in FIG. 2, the outer ring 26 has an outer conical surface 24a, and the outer ring 26 has an inner conical surface 26a. A conical ring 28 is provided in an annular gap formed by the outer conical surface 24a and the inner conical surface 26a. The conical ring 28 has a conical surface corresponding to an outer conical surface 24a and an inner conical surface 26a. The conical ring 28 is connected to the clutch gear 16 so as to rotate together with the clutch gear 16. Further, the inner ring 24 and the outer ring 26 are connected to each other by a claw portion 26b of the outer ring 26 and a groove portion 24b of the inner ring 24 so as to rotate together. Note that the pawl portion 26b
As shown in FIGS. 3 and 4, the groove portion 24b is in contact with the inclined contact end surface, and when the two come into contact under relative rotational force, the inner ring 24 and the outer ring 26 In contrast, a force is generated in a direction that reduces the gap between the outer conical surface 24a and the inner conical surface 26a. The outer conical surface 24a of the inner ring 24 is provided with lubricating oil grooves 52 and 54 extending in the axial direction, as shown in FIGS. 7 and 8. Note that the lubricating oil grooves 52 and 54 are provided corresponding to each groove portion 24b, and the circumferential position of the lubricating oil groove 52 coincides with one contact end surface 56 of the groove portion 24b, Lubricating oil groove 5
The circumferential position of No. 4 coincides with the other contact end surface 58 of the groove portion 24b. Lubricating oil grooves 52 and 5
The radius of No. 4 from the inner ring center axis is smaller than the radius of the innermost diameter portion of the groove 24b from the inner ring center axis. A spline 26c, which is the same as the spline 18a of the synchro hub 18, is provided on the outer diameter portion of the outer ring 26. A spread spring 30 is provided within a circumferential groove 24c provided in the inner diameter portion of the inner ring 24. Spread Spring 3
0 has a shape in which an annular member is cut at one location and the cut portion is bent outward. As shown in FIG.
4d and the recess 26d of the outer ring 26, and is in contact with the walls of both recesses. Since the spread spring 30 is in a compressed state in this state, an elastic reaction force is acting on the inner ring 24 and the outer ring 26 from the bent portions 30a and 30b.

The synchronizing action of this synchronizing mechanism is performed as follows. When the coupling sleeve 20 moves to the left in FIG. 1, a pressing force in the same direction acts on the outer ring 26, and then the splines of the coupling sleeve 20 engage with the outer diameter splines 26c of the outer ring 26. This allows the outer ring 26 to rotate together with the coupling sleeve 20. Outer ring 26, inner ring 24, claw portion 26b and groove portion 24b
Since they are in mesh with each other, when a rotational force is applied to the two, the two become in a state as shown in FIG. 4, and the rotational force between the two is transmitted. In the state shown in FIG. 4, a relative axial force is generated between the outer ring 26 and the inner ring 24 due to the action of the inclined contact end surfaces between the claw portion 26b and the groove portion 24b. This axial force is applied to the outer conical surface 24a and the inner conical surface 26a.
It acts in the direction of compressing the conical ring 28 between the two sides from both sides. This force is the coupling sleeve 2
It acts in addition to the pressing force of 0, and the conical ring 2
Frictional contact is made on both sides of the conical ring 28
A synchronizing action is performed so that the inner ring 24 and the outer ring 26 rotate together. Since the conical ring 28 is configured to rotate together with the clutch gear 16, the synchronizing ring 22 and the clutch gear 16 are in a state where they rotate together. In this state, when the coupling sleeve 20 further moves to the left in FIG. 1, the coupling sleeve 20 can smoothly engage with the spline 16a of the clutch gear 16 which is rotating in synchronization with the coupling sleeve 20. As a result, the synchro hub 18 and the clutch gear 16 are connected by the coupling sleeve 20 so as to rotate together. The clutch gear 16 is spline-coupled to rotate together with the gear 14, and is also connected to the synchro hub 18.
are spline-coupled so as to rotate together with the rotation shaft 10, so the gear 14 rotates together with the rotation shaft 10. As mentioned above, since the synchronizing action is performed on both sides of the conical ring 28, the above-mentioned strong action can be obtained.

The inner ring 24 of the synchronous ring 22, which performs the above-described function, can be manufactured by forging. That is, as shown in FIGS. 7 and 8, the lubricating oil groove 52 is provided at the same circumferential position as the contact end surface 56 of the inner ring 24, and the lubricating oil groove 54 is provided at the same circumferential position as the contact end surface 58. It is provided at a position in the circumferential direction. Therefore, the inclined surface 60a of the forging die 60 shown in FIG. 7 can reach the contact end surface 56 through the lubricating oil groove 52. Similarly, the contact end surface 58 can also be formed using a forging die. Therefore, the groove 24b of the inner ring 24
can be forged and does not require cutting, improving productivity and lowering manufacturing costs.

(G) Effects of the Invention As explained above, according to the present invention, since the engagement groove of the inner ring and the lubricating oil groove of the outer conical surface are provided in correspondence with each other in the circumferential direction, The forging die makes it possible to form the grooves, eliminating the need for cutting and improving productivity.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a synchronizing mechanism of a transmission using an inner ring according to the present invention, Fig. 2 is an enlarged view of the arrowed part in Fig. 1, and Fig. 3 is a view taken along the - mark in Fig. 2. Fig. 4 is a diagram showing the state during the synchronization action of Fig. 3, Fig. 5 is a sectional view taken along the - line in Fig. 1, Fig. 6 is a sectional view taken along the - line in Fig. 5, and Fig. 7. Figure 8 shows the inner ring and forging die (cross-sectional view taken along the - line in Figure 8).
It is a view seen in the direction of the arrow in the figure. 22... Synchronous ring, 24... Inner ring, 2
4a... Outer diameter conical surface, 24b... Groove, 26
... Outer ring, 26a ... Inner diameter conical surface,
26b...Claw portion, 28...Conical ring, 30
... Spread spring, 52, 54... Lubricating oil groove, 56, 58... Contact end surface, 60... Forging die.

Claims (1)

[Claims] 1. A synchronizing ring is composed of an inner ring having an outer conical surface and an outer ring having an inner conical surface, and has friction with both the outer conical surface of the inner ring and the inner conical surface of the outer ring. A conical ring is provided in contact with the inner ring and the outer ring, and the inner ring and the outer ring are configured to transmit force between each other by engaging the claw portion and the groove portion, and the contact end surface between the claw portion and the groove portion is are inclined so as to generate a force in a direction that reduces the clearance between the outer conical surface of the inner ring and the inner conical surface of the outer ring when a rotational force is applied between them. In the method for machining the inner ring groove of a transmission synchronization mechanism in which the outer diameter conical surface has a larger diameter than the groove, a lubricating oil groove provided in the axial direction on the outer diameter conical surface of the inner ring and an inner By arranging the contact end surface of the ring groove at the same circumferential position and entering the forging die through the lubricating oil groove from the side axially opposite to the side where the contact end surface of the groove is arranged, the contact of the groove is achieved. A method for processing an inner ring groove of a transmission synchronization mechanism, characterized by forging the end face.