JP2000234630A - Synchronizer ring for transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve durability of a synchronizer ring comprising non- connection multiple disc constituted by a plurality of inner/outer cone rings. SOLUTION: A synchronizer ring 7 comprising a plurality of inner/outer cone rings 8, 12, 13 are interposed to constitute each inter-contact surface αto γ between an internal peripheral surface of a clutch hub mounted relatively irrotatable in a transmission main shaft and an external peripheral cone surface 10 of an idle rotating gear mounted relatively rotatable in the transmission main shaft. In a plurality of the rings 8 or the like, in the inter-contact surface αpositioned in an outer side, a width of lands 134, 135 similar of the inter- contact surfaces β, γ positioned in an inner side is formed larger than a width of a land 82 between grooves formed in many streaks in a peripheral direction in an internal peripheral cone surface 11 of the outer side ring 8, and a surface pressure per unit area with the lands 134, 135 of the inner side ring 13 press abutting to the intermediate ring 12 and gear cone surface 10 is decreased. In this way, a wearing amount can be reduced in the inner side ring 13 at synchronous meshing time, and durability of the synchronizer ring is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an uncoupled multiple disc synchronizer ring used in a synchronous manual transmission.

[0002]

2. Description of the Related Art A synchronizer ring of a manual transmission (hereinafter referred to as a "transmission") employing a synchromesh mechanism is disposed on a sleeve and a cone of a free-running gear, and is pressed by a sleeve which is moved in an axial direction by a shift operation. This is to apply a frictional force to the cone portion of the idle gear to synchronize the rotational speeds of the sleeve and the idle gear.

[0003] There is a transmission in which the synchronizer ring is constituted by a non-coupled multi-plate. FIG. 4 shows an example of the multi-plate type synchromesh mechanism. The multi-plate type synchromesh mechanism shown in FIG. 4 has a clutch hub 2 that rotates integrally with the transmission main shaft 1, a sleeve 3 movably mounted in the outer periphery of the clutch hub 2 in the axial direction, and a transmission main shaft 1. A free-rotating gear 4 rotatably mounted, and dog teeth 9 integrally formed with the free-rotating gear 4 and capable of meshing with the internal teeth 32 of the sleeve 3.
1 and a synchro cone 9 having an outer peripheral cone surface 10 at an axially protruding boss portion, an outer cone ring 8 inserted into the inner peripheral surface of the clutch hub 2, and an outer cone ring 8
And an inner cone ring 13 interposed between the intermediate cone ring 12 and the outer peripheral cone surface 10 of the synchro cone 9 as main components.

A synchronizer ring 7 is constituted by the three rings 8, 12 and 13. The outer ring 8 has a dog tooth 7 on its outer periphery which meshes with the inner tooth 32 of the sleeve 3.
1 and has an inner peripheral cone surface 11 in which a plurality of grooves are formed in the inner periphery in the circumferential direction for holding or discharging the lubricating oil. And
The teeth (hereinafter referred to as lands) formed between the grooves of the inner peripheral cone surface 11 of the outer ring 8 are constituted by the inner peripheral cone surface 11 of the outer ring 8 and the outer peripheral cone surface 15 of the intermediate ring 12. This is the actual contact surface between the contact surfaces α.

In the inner ring 13, a plurality of grooves are formed in the outer peripheral cone surface 17 and the inner peripheral cone surface 18 in the circumferential direction for holding or discharging the lubricating oil, and each land between the grooves is formed in the middle. An actual contact surface between the contact surfaces β formed by the inner peripheral cone surface 16 of the ring 12 and the outer peripheral cone surface 17 of the inner ring 13, and the inner peripheral cone surface 18 of the inner ring 13 and the outer peripheral cone surface of the synchro cone 9. 10, the actual contact surface between the contact surfaces γ. The intermediate ring 12 is connected to the idle gear 4 via a pawl 136, and the inner ring 13 is connected to the clutch hub 2 via a pawl 137.
It is connected to.

Reference numeral 19 denotes a key for pressing the end surface of the outer ring 8 at the beginning of the start of synchronization, and the key 19 is urged in the centrifugal direction by a spring 20 in a state engaged with the inner peripheral recess 35 of the sleeve 3. Have been. As is well known, the synchronous meshing operation of the synchromesh mechanism is such that the key 19 presses the end face of the outer ring 8 in the F direction at the beginning of the synchronization by moving the sleeve 3 in the axial direction F by the speed change operation, When the outer ring 8 is rotated in the rotation direction of the idle gear 4,
Further, the moving sleeve 3 presses the end face of the outer ring 8 in the F direction with the key 19 left, and meshes the inner teeth 32 of the sleeve 3 with the dog teeth 71 of the outer ring 8 with a strong pressing force. is there. Finally, the sleeve 3 meshes with the dog teeth 91 of the idle gear 4 to complete the shift.

[0007] The synchronizer ring 7 of the uncoupled multi-plate
, The idler gear 4 or the clutch hub 2
The rotational force transmitted to the motor is to increase the synchronizing capacity by using multiple plates and reduce the operating force in the axial direction F.

[0008]

In the synchronous meshing process of the synchronizer ring 7 composed of the unconnected multiple plates, the circumferential rotation between the contact surfaces α to γ is caused by the relative rotation difference between the sleeve 3 and the idle gear 4. Sliding in the direction occurs. The less the sliding and the surface pressure of each contact surface, the less the wear of the synchronizer ring 7 and the higher the durability.

However, in the conventional synchronizer ring 7, since the lands between the contact surfaces α to γ are formed with the same width, the surface pressures at the lands between the contact surfaces α to γ become the same. , Wear also appears equally on each of the rings 8, 12, 13. An object of the present invention is to provide a synchronizer ring for a transmission in which wear is reduced and durability is improved by optimally distributing the surface pressure of a ring between respective contact surfaces. I do.

[0010]

Means for Solving the Problems In order to solve the above problems, the inventors of the present invention have made various studies, and by reducing the surface pressure per unit area of the inner ring when a pressing force is applied, The present inventors have completed the present invention by assuming that the wear amount of the entire synchronizer ring can be suppressed to be small and that the durability can be improved thereby.

That is, the synchronizer ring of the transmission according to the present invention comprises an inner peripheral surface of a clutch hub mounted on the transmission main shaft so as to be relatively non-rotatable and an outer peripheral surface of an idle gear mounted on the transmission main shaft so as to be relatively rotatable. An axial movement of the sleeve interposed between the conical surface and the clutch hub and rotating in the same direction as the clutch hub applies a frictional force to the outer peripheral cone surface (synchro cone) of the idle gear so that the rotation of the sleeve causes the free rotation. In a synchronizer ring of a transmission comprising a plurality of inner and outer cone rings which are not connected to synchronize the rotation of a rotating gear, a land between contact surfaces formed by the inner and outer cone rings and the outer peripheral cone surface of the idler gear. Is characterized in that the width of the land is smaller as the width of the land between the contact surfaces located outside than the width of the land between the contact surfaces located inside.

[0012]

In the synchronizer ring of the transmission according to the present invention, the land between the contact surfaces formed by the plurality of inner and outer cone rings and the outer peripheral cone surface of the idle gear is the land between the outermost contact surfaces. Since the width is smaller, the surface pressure per unit area between the inner contact surfaces becomes smaller than the surface pressure between the outermost contact surfaces when a pressing force is applied. For this reason, the amount of wear of the inner ring can be suppressed to be small, and accordingly, the wear of the entire synchronizer ring is also reduced.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The synchronizer ring of the transmission according to the present invention can use two or more cone rings, and can be applied to a transmission in which each ring is not connected. In the synchronizer ring of the transmission according to the present invention, the land may be a tooth portion between circumferentially formed grooves for holding or discharging the lubricating oil.

In the synchronizer ring of the transmission according to the present invention, the idler gear may be composed of two members: a main body gear thereof and a synchro cone having dog teeth meshing with inner teeth of the sleeve. In this case, the synchro cone is integrally fitted to the main body gear by a spline or the like.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The synchronizer ring of the transmission according to the present invention will be described more specifically with reference to embodiments. FIG. 1 is a cross-sectional view of a configuration in which a synchronizer ring 7 including an outer cone ring 8, an intermediate cone ring 12, and an inner cone ring 13 is attached to a portion of the synchro cone 9 described in FIG. is there.

The outer ring 8 is a ring-shaped member having an inner peripheral cone surface 11 having dog teeth 71 on the outer periphery and a plurality of grooves 81 for holding or discharging lubricating oil formed in the inner periphery in the circumferential direction. , The intermediate ring 12 has an outer peripheral cone surface 15 and an inner peripheral cone surface 16 that contact the inner peripheral cone surface 11 of the outer ring 8.
The inner ring 13 has an outer peripheral cone surface 17 in which a plurality of grooves 131 for holding or discharging the lubricating oil are formed in the circumferential direction and is in contact with the inner peripheral cone surface 16 of the intermediate ring 12; A ring-shaped member having a plurality of grooves 132 for holding or discharging the lubricating oil formed in the circumferential direction and having an inner peripheral cone surface 18 in contact with the outer peripheral cone surface 10 of the synchro cone 9.

Thus, an outer contact surface α is formed between the inner peripheral cone surface 11 of the outer ring 8 and the outer peripheral cone surface 17 of the intermediate ring 12, and the inner peripheral cone surface 16 of the intermediate ring 12 An intermediate contact surface β is formed between the inner ring 13 and the outer peripheral cone surface 17.
3 between the inner peripheral cone surface 18 and the outer peripheral cone surface 10 of the synchro cone 9 constitutes the contact surface γ located inside.

A land 82 (FIG. 3) formed between the grooves 81 of the inner peripheral cone surface 11 of the outer ring 8.
However, the outer ring 8 becomes the intermediate ring 12 between the contact surfaces α.
Is the surface that actually contacts. Similarly, a land 135 (FIG. 2) formed between the grooves 131 of the outer peripheral cone surface 17 of the inner ring 13 is a surface where the intermediate ring 12 actually contacts the inner ring 13 between the contact surfaces β. Also, a groove 13 is formed on the inner peripheral cone surface 18 of the inner ring 13.
2 is a surface where the inner ring 13 actually contacts the outer peripheral cone surface 10 of the synchro cone 9 between the contact surfaces γ.

In the synchronizer ring 7 of the present transmission,
The width of the lands 82, 134, and 135 is characteristic, and is formed on the inner peripheral cone surface 11 of the outer ring 8 as shown in FIGS. Adjust the width a of the land 82 to the outer peripheral cone surface 1 of the inner ring 13.
7 and the width b of the land 134 formed on the inner peripheral cone surface 18 of the inner ring 13 (a <b). Thereby, the surface pressure per unit area when the outer ring 8 is pressed against the intermediate ring 12 and the surface pressure per unit area when the intermediate ring 12 is pressed against the inner ring 13 and the inner ring 13 Surface pressure per unit area when pressed against the outer peripheral cone surface 10 can be reduced.

Each of the grooves 81, 131, and 132 has a size enough to hold or discharge the lubricating oil by its sectional area. In the synchronizer ring 7 of the transmission, the width b of the lands 135 and 134 between the contact surfaces γ and β between the contact surfaces located on the inside is made larger than the width a of the land 82 between the contact surfaces α located on the outside. Accordingly, the surface pressure per unit area of the lands 134 and 135 between the contact surfaces γ and β becomes smaller than the surface pressure per unit area of the land 82 between the contact surfaces α. Considering the synchronous meshing process, when the outer ring 8 is pressed by operating the sleeve 3, the contact pressure β and γ between the contact surfaces of the inner ring 13 with respect to the outer ring 8 can be reduced. As a result, wear of the lands 135 and 134 of the inner ring 13 can be reduced, and the durability as a synchronizer ring is improved.

The synchronizer ring 7 of the embodiment is used.
Consisted of three rings 8, 12, 13.
It may be less or more. In addition, the groove and land surfaces may be provided on one of the cone surfaces constituting the contact surface.

[0022]

As described above, according to the present invention, in a transmission in which a synchronizer ring is constituted by a plurality of cone rings, the surface pressure between adjacent rings to which a pressing force is applied is optimally distributed, so that the land Wear can be reduced and durability can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention.

FIG. 2 is an explanatory view in which circles A and B in FIG. 1 are enlarged.

FIG. 3 is an explanatory diagram in which a circle D in FIG. 1 is enlarged.

FIG. 4 is a sectional view showing a general synchromesh mechanism of the transmission.

[Explanation of symbols]

7 synchronizer ring, 8 outer cone ring, 1
2 ... Intermediate cone ring, 13 ... Inner cone ring, 8
1, 131, 132: groove, 82, 134, 135: land, α to γ: between contact surfaces.

Claims (1)

[Claims] 1. A clutch hub interposed between an inner peripheral surface of a clutch hub mounted on a transmission main shaft so as to be relatively non-rotatable and an outer peripheral cone surface of an idle gear mounted on the transmission main shaft so as to be relatively rotatable. A plurality of uncoupled inner and outer cones that apply frictional force to the outer peripheral cone surface of the idle gear by moving the sleeve that rotates together with the clutch hub in the axial direction and synchronize the rotation of the idle gear with the rotation of the sleeve. In a synchronizer ring of a transmission comprising a ring, a width of a land between contact surfaces formed by the plurality of inner and outer cone rings and an outer peripheral cone surface of the idler gear is:
A synchronizer ring for a transmission, wherein a width of a land between contact surfaces located outside is smaller than a width of a land between contact surfaces located inside.