JP4617576B2 - Gearbox synchronizer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a synchronization device for an automobile transmission.
[0002]
[Prior art]
The key type synchronization device 50 shown in FIG. 6 synchronizes the rotation of the clutch hub 20 and the dog clutch 27 when the clutch sleeve 23 is connected by the coupling sleeve 23. A gear cone 51 for constricting the side is integrally provided, and an inside ring 52, an outside ring 53, and a block ring 54 are fitted to the outer peripheral side of the gear cone 51 with play.
[0003]
The block ring 54 is pushed to the dog clutch 27 side when the coupling sleeve 23 is slid from the clutch hub 20 to the dog clutch 27 side. The block ring 54 rotates out integrally with the gear cone 51 side, that is, the gear cone 51. The side ring 53 is rubbed.
[0004]
The block ring 54 applies the chamfer 55 formed on the outer periphery to the chamfer 56 of the coupling sleeve 23 so as to block the sliding movement of the coupling sleeve 23 and synchronize the clutch hub 20 and the dog clutch 27. Yes.
[0005]
[Problems to be solved by the invention]
By the way, the block ring 54 requires frictional oil because friction is generated on the inner side. In particular, a large gap is formed between the block ring 54 and the clutch hub 20 so that the lubricating oil can easily enter the inside.
[0006]
However, if the block ring 54 is separated from the clutch hub 20 to such an extent that the lubricating oil can sufficiently enter, the play becomes too large, and the friction surface 57 of the block ring 54 partially hits at a stage where the gear is not connected, causing a swing. There was a problem that the block ring 54 was inadvertently tilted at the time of indexing and a gear ringing occurred.
[0007]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a transmission synchronizer capable of solving the above-described problems and preventing syncro burn and gear ringing due to backlash of the block ring while allowing sufficient lubricating oil to enter the inner periphery of the block ring. It is to provide.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a gear cone that is provided on a dog clutch coaxially adjacent to a clutch hub so as to extend toward the clutch hub, and is fitted with play on the outer peripheral side of the gear cone. In a synchronizing device for a transmission comprising a block ring that is axially adjacent and is rubbed against the gear cone side by being pushed toward the dog clutch side, the block ring is provided with a plurality of protrusions that project toward the clutch hub side. The plurality of protrusions each have a gap between the circumferential directions, and the block ring is in contact with the clutch hub in a state where the block ring is separated from the gear cone side. When the part is in contact with the clutch hub and pushed toward the dog clutch, It is intended to be friction.
[0009]
The convex portion may be provided at a position retracted radially inward from the bottom surface position of the spline groove of the block ring.
[0010]
In addition, the convex portions may be provided at equal intervals on the same circumference.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0012]
As shown in FIG. 5, the transmission 1 is connected to a transmission case 2 that forms an outer shell and a driving device (not shown) such as a diesel engine via a clutch (not shown). The input shaft 3 is pivotally supported by inserting one end thereof, and the main shaft 4 is disposed coaxially with the input shaft 3 and is pivotally supported with one end abutting the input shaft 3 and the other end extending from the transmission case 2. And a countershaft 5 which is arranged in parallel vertically below these shafts 3 and 4 and whose both ends are pivotally supported by the transmission case 2.
[0013]
An input gear 6 accommodated in the mission case 2 is integrally provided on the input shaft 3.
[0014]
The counter shaft 5 includes an input counter gear 7 that meshes with the input gear 6, a 4-speed counter gear 8, a 3-speed counter gear 9, a 2-speed counter gear 10, a 1-speed counter gear 11, and a reverse counter gear. 12 are provided integrally with each other.
[0015]
The main shaft 4 includes a 4-speed main gear 13 that meshes with the 4-speed counter gear 8, a 3-speed main gear 14 that meshes with the 3-speed counter gear 9, and a 2-speed main gear 15 that meshes with the 2-speed counter gear 10. A first-speed main gear 16 that meshes with the first-speed counter gear 11 and a reverse main gear 18 that meshes with the reverse counter gear 12 via a reverse idle gear 17 are sequentially rotatably supported. The main gears 13, 14, 15, 16, 18 are rotated together with the counter gears 8, 9, 10, 11, 12 that mesh with each other.
[0016]
The main gears 13, 14, 15, 16, 18 are connected to clutch hubs 19, 20, 21 provided integrally with the main shaft 4 through coupling sleeves 22, 23, 24 described later. The dog clutches 25, 26, 27, 28, 29, and 30 are integrally provided.
[0017]
The coupling sleeves 22, 23, and 24 are spline-engaged on the outer circumferences of the clutch hubs 19, 20, and 21, respectively, so as to be slidable in the axial direction, and are splined to the clutch hubs 19, 20, and 21 by sliding in the axial direction. Any of the adjacent dog clutches 25, 26, 27, 28, 29, and 30 while being engaged is also spline-engaged.
[0018]
A synchronizing device (not shown) is provided between the clutch hubs 19, 20, 21 and the dog clutches 25, 26, 27, 28, 29, 30 to synchronize their rotations. .
[0019]
Each of the synchronizers has the same configuration, and therefore, description will be given by taking as an example a stage where the third-speed main gear 14 is connected to the main shaft 4.
[0020]
As shown in FIG. 1, the synchronization device 31 is a key-type triple cone sync, a gear cone 32 provided integrally with the dog clutch 27 and extending toward the clutch hub 20, and a clutch fitted to cover the outer periphery of the gear cone 32. The inner cone 33 that rotates integrally with the hub 20, the outer cone 34 that is fitted so as to cover the outer periphery of the inner cone 33, and that rotates integrally with the dog clutch 27, and the outer cone 34 is fitted with play and pushed toward the dog clutch 27. Are coupled to the outer ring 34 on the side of the dog clutch 27, and the coupling sleeve 23 is slidably moved in the clutch hub 20 via a spring 36. Move with sleeve 23 and push block ring 35 Made from the eyes of the pusher 37..
[0021]
The gear cone 32 is formed so as to squeeze the clutch hub 20 side, and is close enough that the tip does not contact the clutch hub 20.
[0022]
The inner cone 33 and the outer cone 34 are engaged with the clutch hub 20 or the dog clutch 27 so as to allow movement in the axial direction, respectively, so that the rotation of each other is not hindered when the gear is disconnected.
[0023]
As shown in FIGS. 1, 2, and 3, the block ring 35 has three cutouts 38 in which the outer peripheral end on the clutch hub 20 side is cut out in an arc shape, and a pusher 37 is provided between the cutouts 38. It has the block 39 for making it contact | abut. The blocks 39 are formed at equal intervals on the circumference.
[0024]
Further, the block ring 35 is provided with a plurality of convex portions 41 projecting toward the clutch hub 20 on the surface 40 facing the clutch hub 20. The convex portion 41 narrows the gap between the block ring 35 and the clutch hub 20 at the protruding end.
[0025]
As shown in FIGS. 3 and 4, six convex portions 41 are provided at equal intervals at positions on the same circumference that are retracted radially inward from the position of the bottom surface 43 of the spline groove 42 of the block ring 35.
[0026]
The convex portions 41 are each formed in an arc shape along the circumference, so that even if they contact the clutch hub 20, they do not receive a radial force from the clutch hub 20.
[0027]
And the convex part 41 is formed so that the protrusion may have a flat surface and a corner of the protrusion may be dropped, so that it does not get caught even if it contacts the clutch hub 20, and the friction is reduced.
[0028]
Further, as shown in FIG. 1, chamfers 46 corresponding to the chamfers 45 formed on the splines 44 of the coupling sleeve 23 are respectively formed on the block ring 35.
[0029]
Next, the operation will be described.
[0030]
The rotational driving force of the input shaft 3 is transmitted to the input counter gear 7 via the input gear 6 and rotates the counter shaft 5. The rotation of the counter shaft 5 is transmitted to the respective main gears 13, 14, 15, 16, 18 through the respective counter gears 8, 9, 10, 11, 12, and the respective main gears 13, 14, 15, 16, 18 is rotated on the main shaft 4.
[0031]
Thereby, each dog clutch 25,26,27,28,29,30 and the outer cone 34 are rotated integrally.
[0032]
As shown in FIG. 1, in the stage where the gear is not connected, the block ring 35 is separated from the dog clutch 27 side, that is, the outer cone 34 and is relatively rotated.
[0033]
At this time, since the convex portion 41 is positioned so as not to be separated from the outer cone 34 by hitting the clutch hub 20, there is no play more than necessary, and the convex portion 41 is evenly in contact with the outer cone 34. Further, since the convex portions 41 are provided at equal intervals on the same circumference, no radial force is received from the clutch hub 20.
[0034]
For this reason, the block ring 35 is prevented from tilting and swinging or swinging, and can prevent the friction surface from partially hitting and burning.
[0035]
Further, when the coupling sleeve 23 is slid in the axial direction to connect the gears, the pusher 37 moves together with the coupling sleeve 23 and pushes each block 39 of the block ring 35 equally in the axial direction.
[0036]
Thereby, the block ring 35 is rubbed by the outer cone 34 and starts to rotate relative to the coupling sleeve 23, and the chamfer 45 of the coupling sleeve 23 is brought close to the chamfer 46 of the block ring 35, whereby the chamfer 45, 46 are hit and indexed.
[0037]
At this time, the block ring 35 is positioned in a state in which the convex portion 41 is brought into contact with the clutch hub 20 in advance and is not tilted, so that the same posture can be stably maintained, and the chamfers 45 and 46 are provided over the entire circumference. You can hit each other evenly. As a result, it is possible to prevent gear squealing that occurs when only some of the chamfers 45 and 46 hit each other.
[0038]
When the rotation difference between the block ring 35 and the clutch hub 20 disappears, the coupling sleeve 23 slightly rotates the block ring 35 so as to push away the chamfer 46 of the block ring 35 and passes over the block ring 35. The coupling sleeve 23 is spline-engaged with the dog clutch 27 to complete the gear connection.
[0039]
Further, the lubricating oil that has entered the gap between the block ring 35 and the clutch hub 20 enters the radially inner side, and the friction between the radially inner side through the gap between the block ring 35 and the clutch hub 20 that opens sufficiently large between the convex portions 41. Supplied to the part.
[0040]
Thereafter, the lubricating oil spreads to the side where the diameter is increased along the inclination of the outer cone 34, the inner cone 33 and the gear cone 32, and is blown radially outward from the gap between the block ring 35 and the dog clutch 27.
[0041]
In this way, the block ring 35 is provided with a plurality of convex portions 41 projecting toward the clutch hub 20 and the gap between the block ring 35 and the clutch hub 20 is narrowed, so that sufficient lubricating oil enters the inner peripheral side of the block ring 35. As a result, the play of the block ring 35 can be suppressed, and synchro burning and gear noise can be prevented.
[0042]
Further, since the convex portion 41 is provided at a position retracted radially inward from the position of the bottom surface 43 of the spline groove 42 of the block ring 35, it is possible to prevent the intrusion of the lubricating oil at the inlet, and the lubricating oil can be efficiently used. Can penetrate inside.
[0043]
Since the convex portions 41 are provided at equal intervals on the same circumference, the block ring 35 can be positioned stably.
[0044]
In the above-described embodiment, the case of the triple cone sync has been described. However, the present invention is not limited to this. As long as the block ring 35 is provided, a double cone sync or a single cone sync may be used. .
[0045]
Moreover, the convex part 41 is not restricted to six places, and may be three places, and may be any number of places as long as it does not hinder the penetration of the lubricating oil and does not disturb the balance.
[0046]
【The invention's effect】
In short, according to the present invention, the following excellent effects can be obtained.
(1) While allowing sufficient lubricating oil to enter the inner peripheral side of the block ring, it is possible to prevent synchro burning and gear ringing due to backlash of the block ring.
[Brief description of the drawings]
FIG. 1 is a side view of a synchronization device showing a preferred embodiment of the present invention.
FIG. 2 is a side view of the block ring.
FIG. 3 is a front view of FIG. 2;
4 is a cross-sectional view taken along the line IV-IV in FIG. 3;
FIG. 5 is a schematic explanatory diagram of a transmission.
FIG. 6 is an enlarged side view of a main part of a conventional synchronization device.
[Explanation of symbols]
1 Transmission 19 Clutch hub 20 Clutch hub 21 Clutch hub 25 Dog clutch 26 Dog clutch 27 Dog clutch 28 Dog clutch 29 Dog clutch 30 Dog clutch 32 Gear cone 35 Block ring 31 Synchronizer 41 Projection

Claims (3)

A gear cone provided coaxially with the clutch hub so as to extend to the clutch hub side, and fitted with play on the outer peripheral side of the gear cone, and adjacent to the clutch hub in the axial direction and pushed toward the dog clutch side. In the transmission synchronization device including the block ring that is rubbed against the gear cone side, the block ring is provided with a plurality of protrusions that protrude toward the clutch hub , and each of the plurality of protrusions is circumferential. In the state where there is a gap between them and the block ring is separated from the gear cone side, the block ring is in contact with the clutch hub, and the block ring is in the state where the plurality of convex portions are in contact with the clutch hub. by being pushed to the dog clutch side of the transmission, characterized in that the friction on the Giyakon side Period equipment.   The transmission synchronizer according to claim 1, wherein the convex portion is provided at a position retracted radially inward from a bottom surface position of the spline groove of the block ring.   The transmission synchronizer according to claim 1 or 2, wherein the convex portions are provided at equal intervals on the same circumference.

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