JPH0558966U - Synchronizer - Google Patents

Abstract

(57) [Summary] [Purpose] To make it easier for the lubricating oil to flow between the inner peripheral surface of the synchronizer ring used in the synchronizer of the manual transmission and the cone surface of the speed gear. [Structure] A conical inner peripheral surface 11 of a synchronizer ring 13 capable of engaging with a cone surface 9 provided on a speed gear 3.
Is smaller than the cone angle of the cone surface 9 by a small angle φ _R −φ _G
And a gap that increases toward the large diameter side of the cone surface is formed between both surfaces to promote the flow of the lubricating oil.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to 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 an automobile manual transmission has, for example, a configuration as shown in FIG. 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, the cone angle of the cone surface 9 of the speed gear 3 is the same as the cone angle of the inner peripheral surface 11 of the synchronizer ring 13, and the cone surface 9 and the inner peripheral surface 11 have the same cone angle. Lubricating oil is supplied between the friction surfaces as the lubricating oil in the transmission is scraped up as the speed gear 3 rotates and passes through gaps such as the speed gear 3, the clutch gear 7, the synchronizer ring 13, and the synchronizer sleeve 15. It is supposed to be done.

[0004]

[Problems to be solved by the device]

 When the manual transmission is in another gear, the cone surface 9 of the speed gear 3 and the inner peripheral surface 11 of the synchronizer ring 13 are rotating relative to each other. In this relative rotation state, lubricating oil must be present between the cone surface 9 and the inner peripheral surface 11 in order to prevent wear. However, in the conventional synchronizer 5, since the cone angles of the cone surface 9 and the inner peripheral surface 11 are the same, the lubricating oil interposed between both surfaces is hard to flow and stays for a long time. Since the retained lubricating oil is sheared, phenomena such as an increase in temperature and premature deterioration of the lubricating oil occur. As a result, wear of the friction surface is likely to proceed, the friction coefficient of the friction surface is reduced, and the friction torque required for synchronization is insufficient, so the synchronizer performance cannot be fully exerted and the gear change during gear change. It may cause ringing.

The present invention has been made to solve the above problems, and provides a synchronizer in which lubricating oil easily flows between the cone surface of a relatively rotating speed gear and the inner peripheral surface of a synchronizer ring. It is intended to be provided.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the synchronizer of the present invention has a cone angle of a conical inner peripheral surface of a synchronizer ring which can be engaged with a cone surface provided on a speed gear, which is smaller than the cone angle of the cone surface. It is characterized by making it larger.

[0007]

[Action]

 By making the cone angle of the inner peripheral surface larger than the cone angle of the cone surface, a gap that increases toward the large diameter side of the cone surface is formed between both surfaces, and the lubricating oil can easily flow.

[0008]

【Example】

 Hereinafter, an embodiment of the present invention will be described with reference to FIGS. The same members as those of the conventional structure shown in FIG. 5 are designated by the same reference numerals, and detailed description thereof will be omitted.

In the synchronizer according to the present invention, only the main part of which is shown in FIG. 1, the conical shape of the synchronizer ring 13 capable of frictionally engaging with the conical cone surface 9 of the speed gear 3 integrally formed with the clutch gear 7 As is apparent from FIG. 2, the inner peripheral surface 11 of the inner peripheral surface 11 has a groove 17 and an axial vertical groove 19 for cutting the lubricating oil to generate a large coefficient of friction at the time of frictional engagement with the cone surface 9. And are engraved.

According to the present invention, in order to allow the lubricating oil to easily flow 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, the inner peripheral surface 11 of the synchronizer ring is The cone angle φ _R (FIG. 2) is slightly larger than the cone angle φ _G (FIG. 3) of the cone surface 9 of the speed gear. As a result, a gap is formed between the friction surfaces that increases toward the larger diameter side of the cone surface 9, and the lubricating oil can easily flow in and out.

Generally, the cone angle φ _R of the inner peripheral surface 11 of the synchronizer ring and the cone angle φ _G of the cone surface 9 of the speed gear are normally between 6 and 7 °. It was found from the results of experiments that it is desirable to make φ _R −φ _G a minute angle of 15 to 20 ′.

By making the conical angle difference φ _R −φ _G such a minute angle, the speed gear 3 is generally formed as a rigid body and the synchronizer ring 13 is formed of a material such as a copper alloy which can be deformed to some extent. Therefore, when the synchronizer ring 13 at the time of synchronization is pressed against the speed gear 3 and the inner peripheral surface 11 is frictionally engaged with the cone surface 9, due to the distortion caused by this pressing or frictional engagement, The cone angle difference φ _R −φ _G is eliminated, and problems such as uneven contact with the friction surface and uneven wear do not occur.

Further, as is apparent from the experimental results shown in FIG. 4, as in the present invention, there is an angle difference between the cone angle φ _R of the inner peripheral surface 11 of the synchronizer ring and the cone angle φ _G of the cone surface 9 of the speed gear. When provided, the value of the friction coefficient due to the frictional engagement repeatedly applied between the speed gear 3 and the synchronizer ring 13 does not have a cone angle difference when the number of repetitions (the number of durability) is small. It is superior to the structure and is almost the same as the conventional structure even when the number of repetitions is increasing.

[0014]

[Effect of the device]

 As explained above, according to the synchronizer of the present invention, the cone angle of the inner peripheral surface of the synchronizer ring is made larger than the cone angle of the cone surface of the speed gear, and increases toward the larger diameter side of the cone surface. Since the gap is formed, the lubricating oil can easily flow into this gap. Also, the lubricating oil present in this gap is easily discharged by the centrifugal force caused by the rotation of the speed gear, etc., and does not stay for a long time. The reduction of the friction coefficient can be suppressed.

[Brief description of drawings]

1 is a longitudinal sectional view showing a half portion of a synchronizer ring and a speed gear of a synchronizer according to the present invention.

FIG. 2 is a vertical sectional view showing only the synchronizer ring of FIG.

FIG. 3 is a vertical sectional view showing only the speed gear of FIG.

FIG. 4 is a diagram showing a friction test result of the synchronizer of the present invention.

FIG. 5 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 φ _G cone surface cone angle φ _R inner peripheral surface cone angle

Claims (1)

[Scope of utility model registration request] 1. A synchronizer characterized in that a cone angle of a conical inner peripheral surface of a synchronizer ring engageable with a cone surface provided on a speed gear is set to be larger than a cone angle of the cone surface by a minute angle.