JP4620887B2 - Synchronizer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sleeve having an inner spline portion, a key disposed opposite to the sleeve and disposed on a hub disposed on a transmission shaft, and having a convex portion formed in a central portion in the axial direction. A spring for applying a radially outward load to the key, and the synchronizer ring through the key before the sleeve presses the synchronizer ring against the synchronized member in accordance with the axial displacement of the sleeve. It is related with the synchronizer provided with the structure which presses to the said synchronized member.
[0002]
[Prior art]
As shown in FIGS. 3 and 4, the conventional synchronizer includes a sleeve S having an inner concave shape in an inner spline portion, a key K having an intermediate convex shape, and a spring B that applies a load in the outer radial direction to the key K. The sleeve S is configured to press the synchronizer ring SNR against the synchronized member G via the key K before the sleeve S presses the synchronizer ring SNR against the synchronized member G in accordance with the axial displacement of the sleeve S. I had it.
[0003]
As shown in FIGS. 3 and 4, the action of the sleeve S pressing the synchronizer ring SNR against the synchronized member G via the key K is called a detent action, and a detent load F that is a load due to the detent action is generated. Therefore, in the conventional synchronizer, the R portion provided on the convex portion P of the key K is formed on the lower surface of the key K on the slope having the angle θ of the concave portion C provided in the center inside the sleeve S. The contact is made by the provided spring B.
[0004]
As shown in FIG. 3 and FIG. 4, the typical structures of the key K and the synchronizer ring SNR include the following two types A and B. In the neutral state, the end of the key K in the axial direction And a synchronizer ring SNR is provided with a gap δ1.
[0005]
The first type shown in FIG. 3 has a key insertion groove formed in the synchronizer ring SNR, and the second type shown in FIG. 4 has a key insertion groove in the synchronizer ring SNR. It is not formed.
Necessary for further moving the sleeve S as shown in FIGS. 5 and 6 when the sleeve S moves δ1 from the neutral state by the shift operation and the axial end surface of the key K contacts the synchronizer ring SNR. Load (detent load) occurs.
[0006]
At this time, the movement of the key K is one of the following, based on the balance of the load and moment at each contact point.
Vertical movement (need to be shown in Fig. 5)
When the counterclockwise rotational motion with the point A as a fulcrum is performed, the edge portion E of the sleeve S comes into contact with the flat portion F of the key K as shown in FIGS. After that, since the load for sinking the key K becomes unnecessary, the relationship between the load FS of the sleeve S and the sleeve moving amount SM is as shown in FIG.
[0007]
[Problems to be solved by the invention]
In the conventional synchronizer, when the rotary motion described above is performed, the key K is inclined, so that the edge portion E of the sleeve S contacts the flat portion F of the key K as shown in FIG. Since a load for sinking the key K is required, the relationship between the sleeve load FS and the sleeve moving amount SM is that an unnecessary load is generated as a detent action as shown in FIG. 11 and the shift feeling is deteriorated. There was a problem.
[0008]
Further, in the case of the first type, as the inclination of the key K accompanying the movement of the sleeve S increases, the key K comes into contact with the opposite synchronizer ring SNR as shown in FIG. In order to move S, a larger load is required, and this phenomenon also has a problem that the shift feeling is deteriorated.
[0009]
As described above, the problems in the conventional synchronization device described above are shown in FIG. 10 because the key K does not move in the sinking motion but rotates counterclockwise as shown in FIG. 10 and FIG. Thus, the key K comes into contact with the point A and the key K comes into contact with the three points as shown in FIG.
[0010]
In order to solve this problem in the conventional synchronizer, a synchronizer of the type that separates a sinking component that is a component that receives a spring load and a component that applies a load to the synchronizer ring SNR has been devised. However, there is a problem that the number of parts increases, resulting in an increase in cost.
[0011]
Therefore, the present inventor has a sleeve provided with an inner spline portion and a hub disposed opposite to the sleeve and disposed on the shaft of the transmission, and a convex portion is formed in the central portion in the axial direction. A key and a spring for applying a radially outward load to the key, and with the axial displacement of the sleeve, before the sleeve presses the synchronizer ring against the synchronized member, In the synchronizing device having a structure for pressing the synchronizer ring against the synchronized member, an inclined portion is formed on a side surface portion of the synchronizer ring with which an end portion in the axial direction of the key abuts, and the movement of the key is submerged. As a result of further research and development focusing on the technical idea of the present invention, it is possible to prevent generation of unnecessary load as a detent action without increasing the cost. It has reached the present invention to achieve the object of preventing the deterioration of the grayed.
[0012]
[Means for Solving the Problems]
The synchronization device of the present invention (first invention according to claim 1) is:
In a synchronizing device having a structure that presses the synchronizer ring against the synchronized member via a key before the sleeve presses the synchronizer ring against the synchronized member in accordance with the axial displacement of the sleeve.
An inclined portion is formed on a side surface portion of the synchronizer ring with which an end portion in the axial direction of the key is in contact so that the motion of the key is a sinking motion.
[0013]
The synchronization device of the present invention (the second invention according to claim 2) is:
In the first invention,
The inclined portion is formed so as to reduce a sleeve load required for the sinking motion of the key.
[0014]
The synchronizing device of the present invention (the third invention according to claim 3) is
In the second invention,
The synchronizer is disposed in an axial direction in a sleeve having an inner spline portion in which a concave portion is formed in a central portion in the axial direction, and a hub disposed opposite to the sleeve and disposed in a shaft of the transmission. A key having a convex portion formed at the center thereof, and a spring for applying a radially outward load to the key,
The inclined portion is set to an angle at which the sleeve load necessary for the key sinking motion is smaller than the sleeve load necessary for the rotational motion.
[0015]
The synchronization device of the present invention (the fourth invention according to claim 4) is:
In the third invention,
The inclined portion is formed so that the distance between the opposing portions in the axial direction becomes shorter toward the outer side in the radial direction.
[0016]
Operation and effect of the invention
In the synchronizing device according to the first aspect of the present invention, since the inclined portion is formed on the side surface portion of the synchronizer ring with which the end portion of the key in the axial direction comes into contact, the end portion of the key in the axial direction is formed. The downward load acts by the inclined portion, so that the movement of the key becomes a sinking movement, without increasing the cost, preventing the generation of unnecessary load as a conventional detent action, There is an effect of preventing the deterioration of the shift feeling.
[0017]
In the synchronizing device of the second invention having the above-described configuration, in the first invention, the inclined portion is formed so as to reduce a sleeve load necessary for the sinking movement of the key. It has the effect of realizing a subduction movement.
[0018]
In the synchronization device of the third invention having the above-described configuration, in the second invention, the inclined portion is set to an angle at which a sleeve load necessary for the sinking motion of the key is smaller than a sleeve load necessary for the rotational motion. As a result, it is possible to achieve a more effective sinking motion of the key.
[0019]
In the synchronization device of the fourth invention configured as described above, in the third invention, the inclined portion is formed such that an axial interval is shorter toward the outer side in the radial direction. There is an effect that the downward load is effectively applied to the end portion by the inclined portion.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0021]
(Embodiment)
As shown in FIGS. 1 and 2, the synchronization device of the present embodiment includes a sleeve 1 having an inner spline portion in which a concave portion is formed in the central portion in the axial direction, and a gear that is disposed opposite to the sleeve 1 and has a speed change. A key 3 which is disposed on a hub 2 disposed on the shaft of the machine and has a convex portion formed in the central portion in the axial direction, and a spring 4 which applies a load to the key 3 in the radially outward direction, In the synchronizing device having a structure in which the sleeve 1 presses the synchronizer ring 5 against the synchronized member 6 through the key 3 in accordance with the axial displacement of the sleeve 1, the end of the key 3 in the axial direction An inclined portion 52 having an angle at which the movement of the key 3 becomes a sinking motion is formed on the side surface portion 51 of the synchronizer ring 5 in contact therewith.
[0022]
In the transmission 100 to which the synchronization device of this embodiment is applied, as shown in FIG. 2, a first shaft 101 and a second shaft 102 are arranged in parallel in a case, and a plurality of gears are arranged in each case. The sleeve 1, the key 3, and the hub 2 are disposed between adjacent gears.
[0023]
The sleeve 1 has a concave portion 12 formed between a parallel portion parallel to the axial direction and an inclined portion facing the parallel portion at the central portion in the axial direction of the inner spline portion 11 constituted by the inner peripheral portion between the edge portions. Is formed.
[0024]
The key 3 is disposed on the outer peripheral portion 21 of the hub 2 disposed opposite to the sleeve 1 and disposed on the first shaft 101 of the transmission 100, and the shaft 3 is disposed at the axial center portion of the outer wall. A convex portion 33 is formed, which is composed of a flat portion 31 as a parallel portion parallel to the direction and an inclined portion 32 facing the parallel portion.
[0025]
The spring 4 is inserted between the inner wall of the key 3 and the boss portion 22 of the hub 2, and is configured to apply a radially outward load to the key 3.
[0026]
The synchronizer ring 5 is composed of a ring-shaped member having an L-shaped cross section, and a pair of the synchronizer rings 5 are disposed so as to face each other with the sleeve 1 and the key 3 sandwiched in the axial direction.
[0027]
The synchronizer ring 5 is formed with a groove 53 into which the key 3 is inserted, and is a part of the groove 53 and is an inner side surface portion extending in the vertical direction opposite to the axial end of the key 3. 51, the inclined portion 52 is formed so as to reduce the sleeve load required for the sinking movement of the key.
[0028]
That is, as shown in FIG. 1, the inclined portion 52 is set to an angle β that is smaller than the sleeve load necessary for the rotational movement, that is, an angle of 10 to 20, for example , which is smaller than the sleeve load necessary for the rotational movement of the key 3. In other words, the distance between the facing portions in the axial direction becomes shorter toward the outer side in the radial direction.
[0029]
In the synchronizing device of the present embodiment having the above-described configuration, the inclined portion 52 is formed on the side surface portion 51 of the synchronizer ring 5 with which the axial end portion of the key 3 abuts. When the sleeve 1 moves in the axial direction from the state and the axial end surface of the key 3 comes into contact with the synchronizer ring 5, a downward load is applied to the axial end of the key 3 by the inclined portion 52. To do.
[0030]
In the synchronizing device of the present embodiment that exhibits the above-described operation, when the axial end surface of the key 3 contacts the synchronizer ring 5, a downward load is applied to the axial end portion of the key 3 by the inclined portion 52. By doing so, the movement of the key 3 itself becomes a sinking movement, so that it is possible to prevent generation of an unnecessary load as a conventional detent action and to prevent deterioration of shift feeling.
[0031]
Further, in the synchronization device of the present embodiment, the inclined portion 52 is formed on the side surface portion 51 of the synchronizer ring 5 with which the axial end portion of the key 3 abuts, and thus no new parts are required. There is an effect that it is not necessary to increase the cost associated with new parts.
[0032]
Furthermore, in the synchronization device of the present embodiment, since the inclined portion 52 is formed so as to reduce the sleeve load necessary for the sinking motion of the key 3, an effective sinking motion of the key 3 is realized. There is an effect.
[0033]
Further, in the synchronizing device of the present embodiment, the inclined portion 52 is set to an angle β at which the sleeve load necessary for the sinking motion of the key 3 is smaller than the sleeve load necessary for the rotational motion. This has the effect of realizing a more effective subduction movement.
[0034]
Further, in the synchronization device of the present embodiment, since the inclined portion 52 is formed so that the axial facing interval becomes shorter toward the outer side in the radial direction, the inclined portion 52 is inclined at the axial end portion of the key 3 that abuts. The portion 52 has an effect of effectively applying a downward load and a rotational moment necessary for the sinking motion of the key 3.
[0035]
Regarding the load on the sleeve that realizes the sinking motion, the load ratio in the conventional and the present embodiment is larger in the present embodiment as shown in FIG.
[0036]
The above-described embodiments have been illustrated for the purpose of explanation, and the present invention is not limited thereto. Those skilled in the art will recognize from the claims, the detailed description of the invention, and the description of the drawings. Modifications and additions can be made without departing from the technical idea of the present invention.
[0037]
In the above-described embodiment, an example in which the synchronizer ring 5 is formed with the groove 53 into which the key 3 is inserted has been described as an example. However, the present invention is not limited thereto. The present invention can be applied to other forms in which the synchronizer ring 5 is not formed with the groove 53 into which the key 3 is inserted.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a synchronization device according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a transmission to which the synchronization device of the present embodiment is applied.
FIG. 3 is a cross-sectional view showing a first type synchronization device in which a conventional key insertion groove is formed.
FIG. 4 is a cross-sectional view showing a second type of synchronization device in which a conventional key insertion groove is not formed.
FIG. 5 is a cross-sectional view showing a state in which a sleeve moves and a key abuts in a conventional first type synchronization device;
FIG. 6 is a cross-sectional view showing a state in which a sleeve moves and a key abuts in a conventional second type synchronization device.
FIG. 7 is a cross-sectional view showing a state in which the edge portion of the sleeve is in contact with the flat portion of the key when the key in the conventional first type synchronizer makes a sinking movement.
FIG. 8 is a cross-sectional view showing a state in which an edge portion of a sleeve is in contact with a flat portion of a key when the key is in a sinking motion in the second type synchronization device of the related art.
FIG. 9 is a diagram showing a relationship between a load F on a sleeve and a sleeve moving amount S when a subsidence movement is performed in a conventional synchronizer.
FIG. 10 is a cross-sectional view showing a state in which the edge portion of the sleeve is in contact with the flat portion of the key when the key rotates in the second type synchronization device of the related art.
FIG. 11 is a diagram showing a relationship between a load F on a sleeve and a sleeve moving amount S when a rotary motion is performed in a conventional synchronizer.
FIG. 12 is a cross-sectional view showing a state in which the edge portion of the sleeve is in contact with the flat portion of the key when the key rotates in the conventional first type synchronization device.
FIG. 13 is a diagram showing a comparison result of load ratios related to loads on a sleeve that realizes a sinking motion between the embodiment device of the present invention and the conventional device.
[Explanation of symbols]
1 Sleeve 2 Hub 3 Key 4 Spring 5 Synchronizer ring 6 Synchronized member 51 Side face 52 Inclined part

Claims (4)

In a synchronizing device having a structure that presses the synchronizer ring against the synchronized member via a key before the sleeve presses the synchronizer ring against the synchronized member in accordance with the axial displacement of the sleeve.
The synchronizer is characterized in that an inclined portion is formed on a side surface portion of the synchronizer ring with which an end portion in the axial direction of the key comes into contact so that the movement of the key becomes a sinking movement. In claim 1,
2. The synchronizing device according to claim 1, wherein the inclined portion is formed so as to reduce a sleeve load required for the sinking movement of the key. In claim 2,
The synchronizing device is disposed in a sleeve provided with an inner spline portion having a recess formed in a central portion in an axial direction, and a hub disposed opposite to the sleeve and disposed on a shaft of a transmission. A key having a convex portion formed at the center thereof, and a spring for applying a radially outward load to the key,
2. The synchronizing apparatus according to claim 1, wherein the inclined portion is set at an angle at which a sleeve load necessary for the key sinking motion is smaller than a sleeve load necessary for the rotational motion. In claim 3,
2. The synchronizing device according to claim 1, wherein the inclined portion is formed such that an axial facing interval becomes shorter toward an outer side in the radial direction.

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