JP2002221238A - Synchronous apparatus of transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a synchronous apparatus of transmission capable of preventing seizure in synchronous operation and a creaking gear caused by a rattled block ring while a sufficient lubricant is entered into an inner periphery of the block ring. SOLUTION: In the synchronous apparatus of the transmission 1 comprising a gear cone 32 arranged in a dog clutch 27 coaxially adjacent to a clutch hub 20 so as to extend toward the clutch hub 20, and a block ring 35 fitted into an outer periphery of the gear cone 32 with some play and also rubbed against the gear cone 32 by pushing toward the dog clutch 27, a plurality of a projecting portion 41 extending toward the clutch hub 20 is arranged in the block ring 35, and clearance between the block ring 35 and clutch hub 20 is then reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synchronizing device for an automobile transmission.

[0002]

2. Description of the Related Art A key type synchronizer 50 shown in FIG. 6 synchronizes rotations of a clutch hub 20 and a dog clutch 27 when the coupling sleeve 23 is connected thereto. A gear cone 51 extending to the side and narrowing the tip side is provided integrally, and an inside ring 5 is provided on the outer peripheral side of the gear cone 51.
2. The outside ring 53 and the block ring 54 are fitted with play.

When the coupling sleeve 23 is slid from the clutch hub 20 to the dog clutch 27, the block ring 54 is pushed toward the dog clutch 27, and is integrated with the gear cone 51, that is, the gear cone 51. The rotating outside ring 53 is rubbed.

[0004] The block ring 54 applies a chamfer 55 formed on the outer periphery to the chamfer 56 of the coupling sleeve 23 so as to synchronize the clutch hub 20 and the dog clutch 27 while blocking the sliding movement of the coupling sleeve 23. It has become.

[0005]

By the way, the block ring 54 needs lubricating oil because friction occurs inside, so that the lubricating oil can easily penetrate into the inside with a large gap between the block ring 54 and the clutch hub 20. Like that.

However, if the block ring 54 is separated from the clutch hub 20 to such an extent that the lubricating oil can sufficiently penetrate, the backlash becomes too large, and the friction surface 57 of the block ring 54 partially hits at a stage where the gear is not connected, and the run-out occurs. There has been a problem that the burner may be turned around and burned, or the block ring 54 may be inadvertently inclined at the time of indexing to generate gear noise.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a transmission which solves the above-mentioned problems and which can prevent synchronizing burn and gear noise caused by backlash of the block ring while allowing sufficient lubricating oil to penetrate into the inner peripheral side of the block ring. It is to provide a synchronization device.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a gear cone provided on a dog clutch coaxially adjacent to a clutch hub so as to extend toward the clutch hub, and a gear cone provided on an outer peripheral side of the gear cone. A transmission ring including a block ring that is fitted with play and is pushed toward the dog clutch side to be rubbed against the gear cone side, wherein the block ring has a plurality of protrusions protruding toward the clutch hub side; The gap between the block ring and the clutch hub is narrowed.

It is preferable that the projection is provided at a position which is recessed radially inward from the bottom surface of the spline groove of the block ring.

Further, it is preferable that the convex portions are provided at equal intervals on the same circumference.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 5, a transmission 1 is connected to a transmission case 2 forming an outer shell and a driving device (not shown) such as a diesel engine via a clutch (not shown) or the like. An input shaft 3 having one end inserted into the case 2 and pivotally supported, and an input shaft 3 arranged coaxially with the input shaft 3 and having one end abutting against the input shaft 3 and the other end extending from the transmission case 2 and pivotally supported. The vehicle includes a main shaft 4 and a counter shaft 5 which is disposed vertically below and parallel to the shafts 3 and 4 and both ends of which are pivotally supported by the transmission case 2.

An input gear 6 housed in the transmission case 2 is provided integrally with the input shaft 3.

An input counter gear 7 meshing with the input gear 6, a fourth speed counter gear 8, a third speed counter gear 9, a second speed counter gear 10, a first speed counter gear 11, Reverse counter gears 12 are provided integrally with each other.

The main shaft 4 has a fourth speed main gear 13 meshed with the fourth speed counter gear 8, a third speed main gear 14 meshed with the third speed counter gear 9, and a second speed meshed with the second speed counter gear 10. A main gear 15, a first-speed main gear 16 meshing with the first-speed counter gear 11, and a reverse main gear 18 meshing with the reverse counter gear 12 via a reverse idle gear 17 are sequentially rotatably supported. And these main gears 13,
The 14, 15, 16 and 18 are adapted to rotate together with the counter gears 8, 9, 10, 11 and 12 which mesh with each other.

The main gears 13, 14, 15, 1
Dog clutches 25, 26, 27, and 28 are connected to clutch hubs 19, 20, and 21 provided integrally with the main shaft 4 via coupling sleeves 22, 23, and 24 to be described later. , 29, 30 are provided integrally.

Coupling sleeves 22, 23, 24
Are spline-engaged with the outer circumferences of the clutch hubs 19, 20, 21 so as to be freely slidable in the axial direction.
While being spline-engaged with 21, the dog clutches 25, 26, 27, 28, 29, 30 are also spline-engaged.

Further, each clutch hub 19, 2
0,21 and dog clutch 25,26,27,28,2
A synchronizing device (not shown) for synchronizing the rotations of the motors 9 and 30 is provided.

Since the configurations of the respective synchronizing devices are the same, a 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.

As shown in FIG. 1, the synchronizer 31 is a key type triple cone sync.
A gear cone 32 integrally provided with the clutch hub 20 and an inner cone 3 fitted so as to cover the outer periphery of the gear cone 32 and rotating integrally with the clutch hub 20.
3 and an outer cone 34 fitted so as to cover the outer circumference of the inner cone 33 and rotating integrally with the dog clutch 27.
And the dog clutch 27 is pushed by the dog clutch 27 by being fitted to the outer circumference of the outer cone 34 with play.
Ring 3 rubbed against the outer cone 34 on the side
5 and a pusher which is provided in the clutch hub 20 so as to be axially swingable via a spring 36 and moves together with the coupling sleeve 23 to push the block ring 35 when the coupling sleeve 23 is slid. 37.

The gear cone 32 is formed so as to narrow the clutch hub 20 side.
It is so close that it does not touch 0.

Inner cone 33 and outer cone 34
Are engaged with the clutch hub 20 or the dog clutch 27 so as to allow movement in the axial direction, and do not hinder each other's rotation when the gear is disconnected.

As shown in FIGS. 1, 2 and 3, the block ring 35 has three notches 38 in which the outer peripheral end on the clutch hub 20 side is cut out in an arc shape, and between the notches 38. Block 39 for making contact with pusher 37
Having. The blocks 39 are formed at equal intervals on the circumference.

The block ring 35 has a plurality of projections 41 protruding toward the clutch hub 20 on a surface 40 facing the clutch hub 20. The projection 41 narrows the gap between the block ring 35 and the clutch hub 20 at the tip.

As shown in FIGS. 3 and 4, each of the projections 41 is formed on the bottom surface 4 of the spline groove 42 of the block ring 35.
At the position on the same circumference retracted radially inward from the three positions,
Six places are provided at equal intervals.

Each of the convex portions 41 is formed so as to form an arc along the circumference so that even if the convex portions 41 come into contact with the clutch hub 20, they do not receive a radial force from the clutch hub 20.

The protruding portion 41 is formed so that the protruding end is formed in a plane and the angle of the protruding end is reduced, so that the protruding portion 41 does not get caught even when it comes into contact with the clutch hub 20 and reduces friction. ing.

Also, as shown in FIG.
5, a chamfer 46 corresponding to the chamfer 45 formed on the spline 44 of the coupling sleeve 23 is formed.

Next, the operation will be described.

The rotational driving force of the input shaft 3 is transmitted to the input counter gear 7 via the input gear 6 to rotate the counter shaft 5. The rotation of the counter shaft 5 is controlled by the respective counter gears 8, 9, 1
The respective main gears 13, 1 via 0, 11, 12
The main gears 13, 14, 15, 16, and 18 rotate on the main shaft 4.

Thus, each dog clutch 2
5, 26, 27, 28, 29, 30 and the outer cone 34 are integrally rotated.

As shown in FIG. 1, in a stage where no gear is connected, the block ring 35 is connected to the dog clutch 2.
7 side, that is, relatively separated from the outer cone 34 and relatively rotated.

At this time, since the convex portion 41 is positioned so as not to be too far from the outer cone 34 by hitting the clutch hub 20, there is no more play than necessary, and the convex portion 41 is uniformly contacted 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.

Therefore, the block ring 35 does not tilt and wobble or whirling, and it is possible to prevent the friction surface from partially hitting and burning.

When the coupling sleeve 23 is slid in the axial direction to connect the gear, the pusher 3
7 moves with the coupling sleeve 23 and pushes the respective blocks 39 of the block ring 35 evenly in the axial direction.

As a result, the block ring 35 is rubbed by the outer cone 34 and
, The chamfer 45 of the coupling sleeve 23 moves to the chamfer 46 of the block ring 35.
, The chamfers 45 and 46 hit each other and are indexed.

At this time, since the block ring 35 is positioned so that the protrusion 41 is brought into contact with the clutch hub 20 in advance and is not inclined, the same posture can be stably maintained, and the chamfer is provided over the entire circumference. 45 and 46 can be equally applied. Thus, it is possible to prevent gear noise caused by hitting only some of the chamfers 45 and 46.

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,
Pass over. And the coupling sleeve 23
The spline engagement with the dog clutch 27 completes the gear connection.

Further, the lubricating oil that has entered the gap between the block ring 35 and the clutch hub 20 enters radially inward,
The air is supplied to the radially inner friction portion through the gap between the block ring 35 and the clutch hub 20 which open sufficiently large between the convex portions 41.

Thereafter, the lubricating oil is supplied to the outer cone 34,
It expands to the side where the diameter is expanded along the inclination of 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.

As described above, a plurality of projections 41 protruding toward the clutch hub 20 are provided on the block ring 35 to narrow the gap between the block ring 35 and the clutch hub 20.
It is possible to suppress backlash of the block ring 35 while allowing sufficient lubricating oil to enter the inner peripheral side of the block ring 35,
Synchro burn and gear noise can be prevented.

Further, since the convex portion 41 is provided at a position radially inwardly retracted from the position of the bottom surface 43 of the spline groove 42 of the block ring 35, it is possible to prevent the entry of lubricating oil from being hindered at the entrance, and to prevent lubricating oil Can efficiently penetrate into the interior.

Since the protrusions 41 are provided at equal intervals on the same circumference, the block ring 35 can be positioned stably.

In the above-described embodiment, the case of the triple cone synchro has been described. However, the present invention is not limited to this. You may.

The number of the convex portions 41 is not limited to six, but may be three.
Any number of places may be used as long as the balance is maintained.

[0046]

In summary, according to the present invention, the following excellent effects can be obtained. (1) Synchronous burning and gear noise caused by backlash of the block ring can be prevented while allowing sufficient lubricating oil to enter the inner peripheral side 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 a block ring.

FIG. 3 is a front view of FIG. 2;

FIG. 4 is a sectional view taken along line IV-IV of 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]

 DESCRIPTION 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 Convex part

Claims (3)

[Claims] A gear cone provided on a dog clutch coaxially adjacent to a clutch hub so as to extend toward the clutch hub; and a play cone fitted on an outer peripheral side of the gear cone and pushed toward the dog clutch to thereby provide a gear cone side. A synchronous device for a transmission having a block ring that frictionally abuts, wherein a plurality of convex portions protruding toward the clutch hub are provided on the block ring to reduce a gap between the block ring and the clutch hub. Transmission synchronizing device. 2. The synchronizing device for a transmission according to claim 1, wherein said convex portion is provided at a position radially inwardly retracted from a bottom surface position of a spline groove of the block ring. 3. The synchronizing device for a transmission according to claim 1, wherein the projections are provided at equal intervals on the same circumference.