JP6946800B2 - Lubrication structure of synchro device - Google Patents

Description

The present invention relates to a lubrication structure of a synchro device, and more particularly to a lubrication structure of a synchro device provided with a stopper plate.

A general transmission synchro device has a dog gear fixed to a transmission gear that can rotate relative to the shaft, a synchro hub fixed to the shaft and facing the dog gear, and inner peripheral teeth that mesh with the outer peripheral teeth of the synchro hub. It has a synchro sleeve and a synchronizer ring provided between the synchro hub and the dog gear.

In this type of synchro device, lubricating oil is supplied to each of these elements in order to reduce friction generated in the meshing element, the sliding element, and the like (see, for example, Patent Documents 1 and 2).

Japanese Unexamined Patent Publication No. 04-113029 Japanese Unexamined Patent Publication No. 2009-299790

By the way, in the synchro device, if the gear diameter of the transmission gear is formed to be substantially the same as the gear diameter of the dog gear or smaller than the gear diameter of the dog gear, the synchro sleeve that shifts during the synchro operation passes through the dog gear. There is a risk of contact or intrusion into the transmission gear. Therefore, a stopper plate that regulates the shift movement of the synchro sleeve may be provided between the dog gear and the transmission gear.

However, if the stopper plate is provided between the speed change gear and the dog gear, the meshing flow of the lubricating oil pushed out by the meshing of each speed change gear is blocked by the stopper plate, so that the lubricating oil for the meshing element, the sliding element, etc. There is a problem that the supply amount of the synchro device is insufficient and the lubricity of the synchro device is lowered.

An object of the present disclosure technique is to effectively improve lubricity in a synchro device provided with a stopper plate.

The technique of the present disclosure includes a dog gear fixed to a transmission gear that can rotate relative to the shaft, a synchro hub fixed to the shaft and facing the dog gear, and inner peripheral teeth that mesh with the outer peripheral teeth of the synchro hub. A synchro sleeve, a synchronizer ring provided between the synchro hub and the dog gear, and an annular stopper plate provided between the dog gear and the transmission gear to regulate the shift movement of the synchro sleeve. In the lubrication structure of the synchro device provided, a first through hole for axially penetrating the dog gear is provided at a predetermined position facing the synchronizer ring of the dog gear, and the first through hole of the stopper plate is provided. A second through hole that penetrates the stopper plate in the axial direction is provided at a corresponding position.

Further, the stopper plate is provided so as to be rotatable relative to at least the dog gear, and a plurality of the first through holes are provided in the dog gear at a predetermined pitch in the circumferential direction, and the second through holes are provided. Is provided on the stopper plate at a predetermined pitch in the circumferential direction, and even if the stopper plate rotates relative to the dog gear, at least one second through hole is provided at least one of the first through holes. It is preferably formed with an opening area that always communicates with the hole.

Further, it is preferable that the transmission gear is formed to have the same diameter as the dog gear or a diameter smaller than that of the dog gear, and the stopper plate is formed to have a diameter larger than that of the dog gear.

Further, it is preferable that at least a part of the synchronizer ring is received in the first through hole.

According to the technique of the present disclosure, the lubricity can be effectively improved in the synchro device provided with the stopper plate.

It is a schematic cross-sectional view which shows the lubrication structure of the synchro apparatus which concerns on one Embodiment of this invention. It is a schematic side view which looked at the dog gear and the stopper plate which concerns on one Embodiment of this invention from the axial direction. It is a schematic diagram explaining the flow of the lubricating oil by the lubricating structure of the synchro apparatus which concerns on one Embodiment of this invention. It is a schematic side view which looked at the dog gear and the stopper plate which concerns on other embodiment from the axial direction. It is a schematic side view which looked at the dog gear and the stopper plate which concerns on other embodiment from the axial direction.

Hereinafter, the lubrication structure of the synchro device according to the embodiment of the present invention will be described with reference to the accompanying drawings. The same parts have the same reference numerals, and their names and functions are also the same. Therefore, detailed explanations about them will not be repeated.

As shown in FIG. 1, in the transmission case 2, a main shaft 10 rotatably supported by a bearing (not shown) and a counter shaft 50 are arranged in parallel with each other.

A main gear (an example of a transmission gear) 20 is pivotally supported on the main shaft 10 via a needle bearing 11 so as to be relatively rotatable. Further, the main shaft 10 is provided with a synchro device 40 which is arranged adjacent to the side portion of the main gear 20 and selectively synchronizes (gears in) the main gear 20 with the main shaft 10. The main gear 20 includes an annular hub 21 whose inner peripheral surface is pivotally supported by a needle bearing 11, and a plurality of gear teeth 22 formed on the outer periphery of the hub 21 at a predetermined pitch.

The counter shaft 50 is provided with a counter gear 60 that can rotate integrally. The counter gear 60 includes an annular hub 61 spline-coupled to the counter shaft 50, and gear teeth 62 formed on the outer circumference of the hub 61 at a predetermined pitch and constantly meshing with the gear teeth 22 of the main gear 20. ..

The synchro device 40 includes a synchro hub 41 spline-coupled to the main shaft 10, a synchro sleeve 42 having inner peripheral teeth 42A that mesh with the outer peripheral teeth 41A of the synchro hub 41, and a dog gear spline-coupled to the hub 21 of the main gear 20. A synchronizer ring 45 provided between the synchro hub 41 and the dog gear 43, and a stopper plate 46 provided between the dog gear 43 and the main gear 20 and capable of rotating relative to the dog gear 43 at least are provided. ing. In the present embodiment, the gear diameter of the main gear 20 is formed to be substantially the same as the gear diameter of the dog gear 43 or smaller than the gear diameter of the dog gear 43.

The synchronizer ring 45 includes an outer ring 45A located on the outer side in the radial direction, an inner ring 45B located on the inner side in the radial direction, and an intermediate ring 45C sandwiched between the outer ring 45A and the inner ring 45B. ..

The dog gear 43 includes an annular hub 43B having dog teeth 43A on the outer peripheral portion, and a cone portion 43C formed so as to project from the hub 43B toward the synchro hub 41. The cone portion 43C is formed with a tapered friction surface that is inclined with respect to the axial direction, so that the inner peripheral surface of the inner ring 45B of the synchronizer ring 45 is in sliding contact with the cone portion 43C. At a portion of the hub 43B facing the intermediate ring 45C, a plurality of (three in this embodiment) dog-side through holes 43D penetrating the hub 43B in the axial direction are equidistant in the circumferential direction (at intervals of 120 degrees in the present embodiment). ) Is provided. A part of the protruding end of the intermediate ring 45C is received in the through hole 43D on the dog side. The dog-side through hole 43D corresponds to the first through hole of the present invention.

When the synchro sleeve 42 shifts integrally with a shift fork (not shown), the synchro device 40 generates a synchronous load by pressing the synchronizer ring 45, and when the rotation speeds of the synchro sleeve 42 and the dog gear 43 are synchronized, the synchro device 40 synchronizes. The sleeve 42 is further shifted and meshes with the dog gear 43 so that the main gear 20 is selectively synchronously coupled (gear-in) with the main shaft 10. At this time, the further shift movement of the synchro sleeve 42 to the main gear 20 side is regulated by the stopper plate 46.

The stopper plate 46 is formed in a substantially annular shape having a diameter larger than that of the dog gear 43. At the position corresponding to the dog-side through hole 43D of the stopper plate 46 (the position having the same distance from the axis), the stopper plate 46 is formed by cutting out from the inner peripheral side in the radial direction to the outer side, and the stopper plate 46 is formed. A plurality of (4 in this embodiment) plate-side notch holes 46A penetrating in the axial direction are provided at equal pitches (90 degree intervals in this embodiment) in the circumferential direction. The opening area of the plurality of plate-side notch holes 46A is such that even if the stopper plate 46 rotates relative to the dog gear 43, at least one plate-side notch hole 46A has one dog-side through hole 43D. It is formed in a size that always communicates with. The plate-side through hole 46A corresponds to the second through hole of the present invention. Hereinafter, the details of the dog-side through hole 43D and the plate-side notch hole 46A will be described.

2 (A) to 2 (C) are schematic side views of the dog gear 43 and the stopper plate 46 as viewed from the axial direction. As shown in the figure, the three dog-side through holes 43D1 to 3 are provided in the hub 43B of the dog gear 43 at a pitch of 120 degrees in the circumferential direction, and the opening angle range (length in the circumferential direction) in the circumferential direction is provided. Are each set at about 24 degrees. The four plate-side notch holes 46A1 to 46A1 to 4 are provided in the stopper plate 46 at a pitch of 90 degrees in the circumferential direction, and the opening angle range (length in the circumferential direction) in the circumferential direction is set to about 44 degrees, respectively. ing.

FIG. 2A shows the center position of one dog-side through hole 43D1 among the three dog-side through holes 43D1 to 3 and one of the four plate-side notch holes 46A on the plate side. The center position of the notch hole 46A1 coincides with each other, and the dog-side through hole 43D1 and the plate-side notch hole 46A1 are in perfect communication with each other at a phase of 0 degrees. In this state, the remaining two dog-side through holes 43D2, 3 and the remaining three plate-side notch holes 46A2, 4 communicate with each other in part.

FIG. 2B shows a state in which the stopper plate 46 is rotated about 45 degrees counterclockwise with respect to the dog gear 43 in a phase of 45 degrees from the state shown in FIG. 2A. In this state, the two plate-side notch holes 46A1 and 2 do not communicate with the dog-side through holes 43D1,2, respectively, but one of the remaining two plate-side notch holes 46A4 is most of them. Is in communication with the dog-side through hole 43D3, and most of the remaining one plate-side notch hole 46A3 is also in communication with the dog-side through hole 43D2.

That is, while the stopper plate 46 rotates relative to the dog gear 43 counterclockwise by about 45 degrees, the plate side notch hole 46A4 and the dog side through hole 43D3 are always in communication with each other, and the plate side notch hole 46A3 and the plate side notch hole 46A3. The dog-side through hole 43D2 starts communicating with each other when the stopper plate 46 rotates relative to the dog gear 43 in a counterclockwise direction of about 26 degrees or more.

After that, as shown in FIG. 2C, when the stopper plate 46 is rotated counterclockwise with respect to the dog gear 43 by about 45 degrees from the state of FIG. 2B, the phase is 90 degrees, and the plate side is cut off. The notch 46A2 and the dog side through hole 43D1 are completely communicated with each other, and the dog side through hole 43D2 and 3 and the plate side notch hole 46A3 and 1 are partially communicated with each other.

That is, even if the stopper plate 46 rotates relative to the dog gear 43, at least a part of the plate side notch holes 46A1 to 44 always communicates with at least a part of the dog side through holes 43D1 to 3. ..

When the notch hole 46A on the plate side and the through hole 43D on the dog side communicate with each other in this way, as shown in FIG. 3, the meshing flow pushed out by the meshing between the gear tooth 22 of the main gear 20 and the gear tooth 62 of the counter gear 60. A flows from the notch hole 46A on the plate side into the through hole 43D on the dog side. Further, the lubricating oil that has flowed into the through hole 43D on the dog side is the lubricating oil in the radial direction shown by the arrow A1 in the figure and the lubricating oil in the radial direction shown by the arrow A2 in the figure by the intermediate ring 45C of the synchronizer ring 45. It will be separated from the oil. As a result, the lubricating oil can be effectively supplied to the sliding contact portion between the synchronizer ring 45 and the dog gear 43, the meshing portion between the synchro sleeve 42 and the synchro hub 41, etc., and the lubricity of the synchro device 40 is ensured. It will be possible to improve.

The present invention is not limited to the above-described embodiment, and can be appropriately modified and implemented without departing from the spirit of the present invention.

For example, the number of through holes 43D on the dog side and the notch holes 46A on the plate side, the opening area, the arrangement interval in the circumferential direction, and the like are not limited to the illustrated examples, and even if the stopper plate 46 rotates relative to the dog gear 43, Any one of the dog-side through hole 43D and the plate-side notch hole 46A can be appropriately set within a range in which at least partially communicates with each other at all times.

Further, as shown in FIGS. 4 and 5, in the above embodiment, the plate side notch holes 46A may be further added to make a total of five. In this case, the notch holes 46A1 to 45 on the plate side may be provided in the stopper plate 46 at a pitch of 72 degrees in the circumferential direction. With this configuration, the phase of FIG. 4 (A) is 0 degrees, the phase of FIG. 4 (B) is 20 degrees, the phase of FIG. 4 (C) is 40 degrees, the phase of FIG. 5 (A) is 60 degrees, and the figure ( As shown in the state of the phase of 80 degrees in B) and the phase of 90 degrees in FIG. The lubricity can be further improved.

Further, the arrangement position of the synchro device 40 is not limited to the main shaft 10 side, and may be the counter shaft 50 side.

10 Main shaft 20 Main gear 40 Synchro device 41 Synchro hub 42 Synchro sleeve 43 Dog gear 43D Dog side through hole (first through hole)
45 Synchronizer ring 45C Intermediate ring 46 Stopper plate 46A Plate side notch hole (second through hole)
50 Counter shaft 60 Counter gear

Claims (3)

A dog gear fixed to a transmission gear that can rotate relative to the shaft, a synchro hub fixed to the shaft and facing the dog gear, a synchro sleeve having inner peripheral teeth that mesh with the outer peripheral teeth of the synchro hub, and the synchro. Lubrication structure of a synchro device including a synchronizer ring provided between a hub and the dog gear and an annular stopper plate provided between the dog gear and the transmission gear to regulate the shift movement of the synchro sleeve. And
A first through hole for axially penetrating the dog gear is provided at a predetermined position of the dog gear facing the synchronizer ring, and the stopper plate is axially inserted at a position corresponding to the first through hole of the stopper plate. A second through hole is provided to penetrate the
The stopper plate is provided so as to be rotatable relative to at least the dog gear, and a plurality of the first through holes are provided in the dog gear at a predetermined pitch in the circumferential direction. A plurality of the stopper plates are provided in the circumferential direction at a predetermined pitch, and even if the stopper plate rotates relative to the dog gear, at least one second through hole is formed with at least one first through hole. A lubrication structure for a synchro device, which is characterized by having an opening area that communicates at all times. The lubrication structure for a synchro device according to claim 1, wherein the transmission gear is formed to have the same diameter as the dog gear or a diameter smaller than that of the dog gear, and the stopper plate is formed to have a diameter larger than that of the dog gear. The lubrication structure for a synchro device according to claim 1 or 2 , wherein at least a part of the synchronizer ring is received in the first through hole.

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