JPH0763251A - Lubricating mechanism of synchronizer in gear transmission - Google Patents

Abstract

PURPOSE:To accurately lubricate the cone surface of a taper cone clutch without employing forced lubrication by an oil pump. CONSTITUTION:In the synchronizer of a gear transmission constituted by assembling synchronizer rings 37, 38, 39 for forming a taper cone clutch between a clutch hub 31 and a gear 32 to be assembled on a shaft 11 so as to be relatively rotated, an oblique through hole 32a whose opening on the synchronizer ring side is set on more radially outer side in comparison with the opening on the opposite side thereof is provided in the gear 32.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating mechanism for a synchronizing device used in a gear transmission of a vehicle such as an automobile.

[0002]

2. Description of the Related Art As one of gear synchronizers of a gear transmission, there is one which is constructed by assembling a clutch hub which is mounted on a shaft so as to be rotatable relative to each other and a synchronizer ring which forms a tapered cone clutch between the gears. Yes, the cone surface of the tapered cone clutch is usually lubricated by splash lubrication.

[0003]

By the way, in the synchronizing device, as described in, for example, Japanese Utility Model Laid-Open No. 2-34833, the above is accompanied by the multi-synchronization and the increase in rotation speed with a plurality of synchronizer rings. Lubrication is becoming difficult to deal with. Although a forced lubrication by an oil pump is also performed as a means for dealing with this, the cost and weight increase greatly. The present invention has been made to address the above-described problems, and an object thereof is to accurately lubricate the cone surface of a tapered cone clutch without employing forced lubrication by an oil pump.

[0004]

In order to achieve the above object, the present invention provides a synchronizer ring for forming a tapered cone clutch between a clutch hub and a gear which are mounted on a shaft so as to be rotatable relative to each other. In the synchronizer of the gear transmission constructed by assembling, the gear is provided with an oblique through hole whose opening on the synchronizer ring side is radially outward of the opening on the opposite side.

[0005]

In the lubricating mechanism according to the present invention, when the gear rotates, a flow toward the synchronizer ring side opening is formed by the centrifugal force in the through hole provided in the gear. Therefore, the lubricating oil is introduced into the through hole and sent toward the cone surface of the taper cone clutch, and the cone surface of the taper cone clutch is lubricated properly. By the way, the lubrication mechanism according to the present invention has a structure in which the through holes are only provided in the gear, so that the cost increase is small and the weight can be reduced.

[0006]

An embodiment of the present invention will be described below with reference to the drawings. In the gear transmission shown in FIG. 1, a clutch hub 21 that is spline-coupled on the shaft 10 and rotates integrally, and a clutch hub 21 that is rotatably assembled on the shaft 10 via a bearing 11 to the clutch hub 21. The synchronizer A is assembled between the small-diameter gears 22 that can rotate relative to each other, and the clutch hub 31 that is splined on the shaft 10 and rotates integrally, and the shaft 10.
A large-diameter gear 32, which is rotatably assembled on the bearing hub 12 and is rotatable relative to the clutch hub 31.
A synchronizer B is installed in between. Both gears 22, 32
Is a helical gear, and the twisting direction of the gear 22 is a direction in which the lubricating oil attached to the tooth portion 22 a is pushed toward the gear 32 by the rotation.

The synchronizer A is known per se, and has a key spring 23 attached to the clutch hub 21,
Index key 24, hub sleeve 25, and gear 2
2 includes a spline piece 26 that is integrally assembled with the two, and a synchronizer ring, that is, an outer ring 27, a middle ring 28, and an inner ring 29 that are arranged between the clutch hub 21 and the gear 22 to form three tapered cone clutches. The outer ring 27 and the inner ring 29 are configured to rotate integrally with the clutch hub 21, and the middle ring 28 has a protrusion 28a.
Is fitted in an engagement hole 26a provided in the spline piece 26 so as to rotate integrally with the gear 22. The spline piece 26 may be integrally formed with the gear 22.

On the other hand, the synchronizer B is a known one in itself, and the key spring 3 assembled to the clutch hub 31.
3, index key 34 and hub sleeve 35, spline piece 36 integrally assembled to gear 32, synchronizer ring or outer ring arranged between clutch hub 31 and gear 32 to form three tapered cone clutches 37, the middle ring 38, and the inner ring 39. The outer ring 37 and the inner ring 39 are configured to rotate integrally with the clutch hub 31, and the middle ring 38 has the projection 3 thereof.
8a is fitted in an engagement hole 36a provided in the spline piece 36 and is configured to rotate integrally with the gear 32. The spline piece 36 may be integrally formed with the gear 32.

By the way, in this embodiment, the large-diameter gear 32 is provided with an oblique through hole 32a which is radially outward of the synchronizer ring side opening as compared with the opposite side opening, and corresponds to the opposite side opening. An annular protrusion 32b that forms the oil reservoir S is integrally formed at the end of the small-diameter gear 22 side. Therefore, when both gears 22, 32 rotate, the gear 32
A flow toward the synchronizer ring side opening is formed by a centrifugal force in the through hole 32a provided at the same time, and the lubricating oil attached to the tooth portion 22a of the gear 22 is pushed toward the gear 32 and flows into the oil reservoir S. . Therefore, the lubricating oil is introduced into the through hole 32a and is fed toward the cone surface of each taper cone clutch formed between the outer ring 37, the middle ring 38, the inner ring 39, and the gear 32, and each taper cone is formed. The cone surface of the clutch is accurately lubricated.

In the above embodiment, the present invention is applied to the synchronizer B having three synchronizer rings, but the present invention can be similarly applied to a synchronizer having one synchronizer ring. . Further, in the above embodiment, the gear 32 is formed with the annular projection 32b to form the oil reservoir S, and the lubricating oil attached to the tooth portion 22a of the gear 22 flows into the oil reservoir S. However, it is possible to practice the present invention without providing them.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of an essential part showing an embodiment of the present invention.

[Explanation of symbols]

10 ... Shaft, 22 ... Small diameter gear, 31 ... Clutch hub, 32 ... Large diameter gear, 32a ... Through hole, 32b ... Annular protrusion, 33 ... Key spring, 34 ... Index key, 35 ... Hub sleeve, 36 ... Spline Piece, 3
7 ... Outer ring, 38 ... Middle ring, 39 ... Inner ring, A, B ... Synchronizing device, S ... Oil sump.

Claims (1)

[Claims] 1. A synchronizer for a gear transmission, comprising a clutch hub mounted on a shaft so as to be rotatable relative to each other, and a synchronizer ring forming a tapered cone clutch between the gears, wherein the synchronizer ring side is provided. A lubrication mechanism for a synchronizing device in a gear transmission, wherein an oblique through hole having an opening radially outward of an opening on the opposite side is provided in the gear.