JPH0558963U - Synchronizer ring - Google Patents

Abstract

(57) [Summary] [Purpose] To make it easier to guide the lubricating oil that flows in the radial direction by centrifugal force inside the synchronizer of the manual transmission to the cone surface of the synchronizer ring. [Structure] An oil receiving portion 21 is formed on the entire circumference of a small diameter end portion of a synchronizer ring 13 having a conical inner peripheral surface 11 capable of engaging with a cone surface 9 provided on a speed gear 3.
The oil receiving portion 21 extends axially beyond the corresponding end of the cone surface 9, receives the lubricating oil 22 flowing from the axial center toward the outer periphery, and guides it to the cone surface 9.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a synchronizer ring of a synchronizer used for a manual transmission of an automobile, and more particularly to a structure for supplying lubricating oil.

[0002]

[Prior Art]

 A synchronizer for a manual transmission of an automobile has a structure as shown in FIG. 3, for example. That is, the speed gear 3 is provided in an idle state on the outer circumference of the input side shaft 1, and is constantly meshed with the gears of the other shafts. A clutch gear 7 is integrally provided on the speed gear 3, and a conical cone surface 9 called a synchro cone is formed. Then, the synchronizer ring 13 having the corresponding conical inner peripheral surface 11 that can be frictionally engaged with the cone surface 9 is axially pressed by the synchronizer sleeve 15. By this pressing, the cone surface 9 and the inner peripheral surface 11 are engaged with each other to generate a friction torque, and the shaft 1 and the speed gear 3 having different rotational speeds are synchronized. After the synchronization is performed, the teeth formed on the synchronizer sleeve 15 mesh with the teeth of the synchronizer ring 13 and the teeth of the clutch gear 7, and the shaft 1 and the speed gear 3 are connected.

In the synchronizer 5 as described above, the lubricating oil in the transmission is supplied to the friction surface between the cone surface 9 of the speed gear 3 and the inner peripheral surface 11 of the synchronizer ring 13 by the speed gear 3 or the like. It is scraped up by the rotation of the gear and is passed through the gaps such as the speed gear 3, the clutch gear 7, the synchronizer ring 13 and the synchronizer sleeve 15.

[0004]

[Problems to be solved by the device]

 However, the lubricating oil that has entered the inside of the synchronizer 5 scatters from the shaft center toward the outer periphery due to the centrifugal force caused by the rotation, and is difficult to be guided to the friction surface between the speed gear 3 and the synchronizer ring 13, so that the friction is reduced. Lubrication of the surface will occur, resulting in excessive temperature rise and defective discharge of wear powder from the friction surface, and eventually the friction coefficient of the friction surface will decrease. If the friction coefficient of the friction surface decreases in this way, the friction torque required for synchronization will be insufficient, and the performance of the synchronizer will not be fully exerted, and gear squeal may occur during gear changes.

The present invention has been made to solve the above problems, and an object thereof is to provide a synchronizer ring capable of sufficiently guiding lubricating oil to a friction surface.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the synchronizer ring of the present invention has a cone surface corresponding to the entire circumference of the small diameter end of the synchronizer ring having a conical inner peripheral surface capable of engaging with the cone surface provided on the speed gear. It is characterized in that an oil receiving portion is formed which extends axially from the end portion and receives the lubricating oil flowing from the shaft center toward the outer periphery and guides it to the cone surface.

[0007]

[Action]

 The lubricating oil in the transmission flows from the shaft center to the outer circumference due to the centrifugal action that accompanies the rotation of the speed gear, and this flowing lubricating oil is received by the oil receiving portion formed all around the small diameter end of the synchronizer ring, It is supplied to the cone surface of the speed gear.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. The same members as those in the conventional structure shown in FIG. 3 are designated by the same reference numerals.

In the synchronizer for a manual transmission according to the present invention shown in FIG. 1, a plurality of speed gears 3 are provided in an idle state on the outer circumference of a shaft 1 on the input side. These speed gears 3 are always in mesh with a speed gear provided on another shaft (not shown). A synchronizer 5 is provided between the speed gears 3.

In the synchronizer 5, conical cone surfaces 9 called sync cones are formed at opposite ends of two speed gears 3 integrally formed with a clutch gear 7. A synchronizer ring 13 having a corresponding conical inner peripheral surface 11 capable of frictionally engaging with the cone surface 9 is provided corresponding to each speed gear 3. A synchronizer hub 14 is spline-coupled to the shaft 1 between the speed gears 3, and a synchronizer sleeve 15 is spline-coupled to the outer periphery of the synchronizer hub 14 so as to be movable in the axial direction. There is. The synchronizer ring 13 is axially pressed by a synchronizer sleeve 15, and the synchronizer sleeve 15 is arbitrarily moved in the axial direction by a selector 19 fitted into a groove 17 provided on the outer circumference. With the above movement, the teeth of the synchronizer sleeve 15 mesh with the teeth of the synchronizer ring 13 and the teeth of the clutch gear 7.

An annular oil receiving portion 21 is formed on the synchronizer ring 13 provided corresponding to each speed gear 3. The annular oil receiving portion 21 is connected to the synchronizer hub 14 from the entire circumference of the small-diameter end portion of the synchronizer ring 13, that is, the end portion of the inner peripheral surface 11 engaging with the cone surface 9 having a smaller radius. It overhangs in parallel with the axis. The oil receiving portion 21 extends axially beyond the corresponding end portion of the cone surface 9 of the speed gear 3.

It is desirable that the amount of protrusion of the oil receiving portion 21 is sufficiently long. Particularly, as shown in FIG. 2, the inner peripheral surface 11 of the synchronizer ring 13 is considerably frictionally engaged with the cone surface 9 of the speed gear 3. Even if the synchronizer ring 13 wears and moves a considerable amount to the right as indicated by the chain line in the figure during frictional engagement, the oil receiver 21 should be dimensioned so as to project sufficiently to receive the lubricating oil. Is desirable.

The operation of this embodiment will be described. The operation of the synchronizer 5 at the time of gear change is the same as the conventional one. That is, the selector 19 fitted in the groove 17 moves the synchronizer sleeve 15 in the axial direction on the synchronizer hub 14. The moved synchronizer sleeve 15 axially presses the synchronizer ring 13, whereby the inner peripheral surface 11 of the synchronizer ring 13 and the cone surface 9 of the speed gear 3 are brought into sliding contact with each other, and the speed gear 3 and the shaft 1 are brought into contact with each other. Synchronization is done. When both rotation speeds become the same and the synchronization is completed, the synchronizer sleeve 15 is further moved, the teeth of the synchronizer sleeve 15 completely mesh with the teeth of the synchronizer ring 13 and the teeth of the clutch gear 7, and the shaft 1 and the speed are The gear 3 is connected.

Lubricating oil in the transmission may fly as oil drops or splashes in the radial direction with respect to the shaft 1 or flow along the side surface of the clutch gear 7 due to the centrifugal action caused by the rotation of the speed gear 3 and the like. .. The lubricating oil 22 that flows in such a radial direction is received by the oil receiving portion 21, and is guided as it is to the friction surface between the cone surface 9 of the speed gear 3 and the inner peripheral surface 11 of the synchronizer ring 13. That is, as shown in FIG. 2, the gap 23 at the end of the clutch gear 7 is covered by the oil receiving portion 21, which is smaller than that of the conventional structure shown in FIG. Most of the oil 22 will be guided to the friction surface.

As described above, in the present invention, the lubricating oil 22 inside the synchronizer 5 flows in the radial direction by the centrifugal force, is received by the annular oil receiving portion 21, is guided to the friction surface, and is further abraded. Supplied on the entire surface. Therefore, as compared with the conventional structure in which the oil receiving portion is not provided, a sufficient amount of the lubricating oil 22 is guided to the friction surface, so that good lubrication can be maintained. As a result, it is possible to dissipate heat on the friction surface, prevent the temperature from rising excessively, keep the abrasion powder discharged from the friction surface well, and maintain the friction characteristics of the synchronizer ring.

In the above embodiment, the speed gear 3 is formed by integrally forming the clutch gear 7 and the cone surface 9, but in the present invention, the clutch gear 7 having the speed gear 3 and the cone surface 9 is formed separately. Also, the present invention can be applied to a device integrated by spline 27 coupling, and the same effect can be obtained.

[0017]

[Effect of the device]

 As described above, according to the synchronizer ring of the present invention, the oil receiving portion formed on the entire circumference of the small-diameter end portion causes the lubricating fluid to flow outward in the semi-radial direction by the centrifugal force caused by the rotation of the speed gear or the like. Since oil can be received and supplied to the entire friction surface between the speed gear and the synchronizer ring, lubrication of the friction surface is improved, excessive temperature rise and wear powder discharge failure are prevented, and friction of the friction surface is reduced. It is possible to prevent the coefficient from decreasing.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a synchronizer according to the present invention.

FIG. 2 is an enlarged vertical sectional view of a portion A in FIG.

FIG. 3 is a vertical cross-sectional view showing a conventional synchronizer.

[Explanation of reference numerals] 1 shaft 3 speed gear 5 synchronizer 7 clutch gear 9 cone surface 11 inner peripheral surface 13 synchronizer ring 14 synchronizer hub 15 synchronizer sleeve 19 selector 21 oil receiver 22 lubricating oil

Claims (1)

[Scope of utility model registration request] 1. A small-diameter end portion of a synchronizer ring having a conical inner peripheral surface engageable with a cone surface provided on a speed gear, extends over the entire circumference of a small-diameter end portion in the axial direction more than the corresponding end portion of the cone surface. A synchronizer ring, characterized in that an oil receiving portion is formed to receive the lubricating oil flowing from the shaft center toward the outer periphery and guide it to the cone surface.