JPH0558965U - Synchronizer ring - Google Patents

Abstract

(57) [Summary] [Purpose] To allow the lubricating oil flowing through the groove formed on the inner peripheral surface of the synchronizer ring used in the synchronizer of the manual transmission to be easily discharged. A dimension of a vertical groove 19 formed on a conical inner peripheral surface 11 capable of engaging with a cone surface provided on a speed gear is gradually increased in a direction in which an inner diameter of the inner peripheral surface 11 increases. The angle of the bottom surface 21 of the vertical groove 19 is made larger than the cone angle of the inner peripheral surface 11.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure of a synchronizer ring of a synchronizer used for a manual transmission of an automobile, and particularly to a shape of a groove formed on an inner peripheral surface of the synchronizer ring.

[0002]

[Prior Art]

 The synchronizer for a manual transmission of an automobile has a structure as shown in FIG. 4, 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 capable of frictionally engaging with the cone surface 9 is axially pressed by the synchronizer sleeve 15 which can move on the synchronizer hub 14. 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 with each other. 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 such a synchronizer 5, a screw for generating a large friction coefficient on the inner peripheral surface 11 of the synchronizer ring 13 by cutting the lubricating oil at the time of frictional engagement with the cone surface 9 of the speed gear 3 is provided. Grooves and vertical grooves are engraved to help discharge inclusions such as lubricating oil and abrasion powder. The bottom surface of the vertical groove is generally parallel to the inner peripheral surface 11 and has a constant width.

[0004]

[Problems to be solved by the device]

 However, in the structure of the thread groove and the vertical groove in the conventional synchronizer ring 13, since the forcing force of the flow of the lubricating oil is weak, the abrasion powder generated by the sliding contact of the friction surface between the speed gear 3 and the synchronizer ring 13 is generated. Also, the intervening lubricating oil deteriorates due to shearing and heat load at the time of synchronous action, and the resulting substance clogs, so that the friction surface cannot be kept clean, and as a result the friction coefficient of the friction surface decreases. 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 noise may occur during gear changes.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a synchronizer ring that facilitates discharge of abrasion powder and deterioration of lubricating oil generated by friction. .

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the synchronizer ring of the present invention has a size of a vertical groove formed on a conical inner peripheral surface which can be engaged with a cone surface provided on a speed gear. It is characterized by gradually increasing in the direction of increase.

[0007]

[Action]

 Increasing the size of the vertical groove in the direction of increasing the inner diameter of the inner peripheral surface ensures that the inclusions between the friction surfaces are reliably discharged into the vertical groove by the centrifugal action accompanying the rotation of the synchronizer ring.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. The same members as those in the conventional structure shown in FIG. 4 are designated by the same reference numerals, and detailed description thereof will be omitted.

In the synchronizer ring 13 according to the present invention, the half part of which is shown in FIG. 1, a corresponding conical inner surface that can be frictionally engaged with the conical cone surface 9 of the speed gear 3 integrally formed with the clutch gear 7. The surface 11 is engraved with a thread groove 17 and an axial vertical groove 19 for cutting off the lubricating oil to generate a large friction coefficient at the time of frictional engagement with the cone surface 9.

According to the first embodiment of the present invention shown in FIG. 1, the lubricating oil interposed between the friction surface between the cone surface 9 of the speed gear 3 and the inner peripheral surface 11 of the synchronizer ring 13 can be easily discharged. In order to do so, the angle θ _{1 of the} bottom surface 21 of the vertical groove 19 is larger than the cone angle θ ₂ of the inner peripheral surface 11. That is, the depth of the vertical groove 19 gradually increases toward the larger diameter side. The lubricating oil present in the vertical groove 19 receives a centrifugal force due to the rotation of the synchronizer ring 13, and the acceleration (that is, the component force of the centrifugal force in the cone angle direction) α exerted on the lubricating oil at this time is α = r・ It is given by ω ² · sin θ. Here, r is the radius from the center of rotation, and ω is the rotational angular velocity. In the present embodiment, θ = θ ₁ and a larger acceleration α can be obtained than in the case of θ = θ ₂ in the conventional structure.

Therefore, a large force is applied in the flow direction, that is, the large-diameter side, to the lubricating oil present in the vertical groove 19 as well as to the abrasion powder and the altered oil contained in the lubricating oil. It becomes possible to discharge inclusions early. This keeps the inner peripheral surface 11 of the synchronizer ring 13 clean and prevents the friction coefficient of the friction surface from decreasing.

In the second embodiment of the present invention shown in FIG. 2, the angle of the bottom surface 21 of the vertical groove 19 is the same as the cone angle of the inner peripheral surface 11, that is, the depth of the vertical groove 19 is constant, The width W of the vertical groove 19 gradually increases in the direction of the large diameter side.

Therefore, due to the centrifugal action caused by the rotation of the synchronizer ring 13, the lubricating oil flowing in the direction of the large diameter side in the vertical groove 19 and the abrasion powder and the altered substances contained therein are less likely to adhere to the groove wall surface. It is possible to prevent the vertical groove 19 from being clogged, and it is possible to quickly discharge the lubricating oil and the like.

A third embodiment of the present invention shown in FIG. 3 is a combination of the structures of the two embodiments of FIGS. 1 and 2, in which the angle of the bottom surface 21 of the vertical groove 19 is equal to that of the inner peripheral surface 11. Not only is it larger than the cone angle, that is, the depth of the vertical groove 19 gradually increases toward the large diameter side, but the width W of the vertical groove 19 also gradually increases toward the large diameter side. Therefore, the two effects of the above-described embodiments can be synergistically obtained. That is, the lubricating oil, abrasion powder, and degenerated substances present in the vertical groove 19 are subjected to a larger centrifugal force than before, and are less likely to adhere to the wall surface of the vertical groove 19, so that the flow is further promoted and the lubricating oil It is possible to reliably discharge such as.

[0015]

[Effect of the device]

 As described above, according to the synchronizer ring of the present invention, the angle of the bottom surface of the flute is made larger than the cone angle of the inner peripheral surface, that is, the depth of the flute is gradually increased toward the large diameter side. The centrifugal force that acts on the lubricating oil present in the vertical groove can be increased, and therefore, along with the lubricating oil, abrasion powder and deterioration products of the lubricating oil can easily pass through the vertical groove and be discharged at an early stage. The inner peripheral surface of the ring is kept clean, and the reduction of the friction coefficient of the friction surface can be suppressed.

Further, by gradually increasing the width of the vertical groove in the direction of the large diameter side, the lubricating oil or the like flowing in the direction of the large diameter inside the vertical groove due to the centrifugal action associated with the rotation of the synchronizer ring. It is difficult for the oil to adhere to the wall surface, and therefore the abrasion powder contained in the lubricating oil and the substances generated by the alteration of the lubricating oil can be discharged quickly, and the inner peripheral surface of the synchronizer ring is kept clean. It is possible to prevent the friction coefficient of the friction surface from decreasing.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a half portion of a synchronizer ring according to a first embodiment of the present invention.

FIG. 2 is a vertical sectional view showing a half portion of a synchronizer ring according to a second embodiment of the present invention.

FIG. 3 is a perspective view showing a synchronizer ring according to a third embodiment of the present invention.

FIG. 4 is a vertical cross-sectional view showing a conventional synchronizer.

[Explanation of symbols]

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 17 screw groove 19 vertical groove 21 bottom surface W vertical groove width θ ₁ bottom surface angle θ ₂ inner peripheral surface Cone angle

Claims (1)

[Scope of utility model registration request] 1. The size of a vertical groove formed on a conical inner peripheral surface capable of engaging with a cone surface provided on a speed gear is gradually increased in a direction in which an inner diameter of the inner peripheral surface increases. Synchronizer ring featuring.