JPH0533782Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a synchronizing device in a transmission, particularly a gear transmission.

[Conventional technology]

Conventionally, synchronizing devices for gear transmissions have been disclosed as shown in FIGS. 4 and 5. In FIG. 4, this synchronizer transmits the rotation of the clutch hub 23 to a speed change gear (not shown), and the insert key 25 inserted into the outer circumferential groove of the clutch hub 23 is inserted in the direction of the rotation axis of the clutch hub 23. Although it is slidable, it is fixed in the direction of rotation. The insert key 25 is pressed radially outward by an insert spring 22.

A sleeve 21 is arranged around the outer periphery of the clutch hub 23. A spline 28 is formed on the inner periphery of the sleeve 21, and a groove, that is, a circumferential recess 24, is formed in the center of the spline 28.

Further, an annular groove 26 is formed on the outer periphery of the sleeve 21, and a shifter fork (not shown) is fitted into the annular groove 26.
A protrusion 27 of an insert key 25 is positioned in a circumferential recess 24 formed in a spline 28 on the inner circumference of the sleeve 21 .

In FIG. 5, what is shown in FIG. 5 is disclosed in Japanese Patent Application Laid-open No. 167526/1983. The synchronizer for this transmission, that is, the transmission, is constructed as follows. That is, the synchronizing device of the transmission includes a synchronizing hub 31 that is spline-fitted with the main shaft 32 and rotates integrally with the main shaft 32, and the synchronizing hub 31.
synchro sleeve 33 that meshes with the transmission gear 3
6 and 37, and a shifting key 38 that fits into a key groove provided in the synchronizer hub 31.

Furthermore, in the transmission synchronizer, the shifting key 38 is constituted by a cylindrical roller having a center hole 38a, and is inserted into the groove on the outer periphery of the synchronizing hub 31 into the center hole 38a of the shifting key 38. The shifting key 38 is fitted and held in a key groove of the synchronizer hub 31 by inserting a spring 39 therethrough, and the synchronizer rings 34 and 35 are provided with protrusions that fit in the key grooves. A transmission synchronizer is shown.

[Problem that the invention aims to solve]

However, in the synchronizing device in the gear transmission shown in FIG. I'm here. Therefore, when the sleeve 21 is slid by a fork or the like, the sleeve 21 is moved in the axial direction of the clutch hub 23, and at that time, the protrusion 27 of the insert key 25 moves into the circumferential recess 24 formed in the spline 28 of the sleeve 21. The insert spring 22 is pushed down and the spline 28 of the sleeve 21 passes over the protrusion 27 of the insert key 25.

At this time, a large frictional force is generated between the protrusion 27 of the insert key 25 and the spline 28 of the sleeve 21, causing a sudden change in the operating force, making it difficult to shift the sleeve 21 smoothly. There was a problem that it was difficult to shift gears.

In the transmission synchronizer shown in FIG. 5, a shifting key 38, ie, a roller, is supported by a spring 39 formed in a synchronizer hub 31 and attached to a locking recess. Then, the roller 38 fits into a key groove formed in the synchro hub 31, and
It engages with a circumferential recess 33C formed in the synchro sleeve 33, that is, the coupling sleeve.

Therefore, in this synchronizer, since the roller 38 is built into the spring 39, when the spring 39 is twisted during a shift, the side part of the roller 38 is not guided, and the roller 38 is moved in the shift direction. There was a problem that the roller 38 tended to tilt and not rotate smoothly.

Therefore, the purpose of this invention is to solve the above problem, by incorporating an insert key with a sufficient guide length between the sleeve and the clutch hub, and supporting the roller reliably and rotatably on the insert key. Therefore, it is an object of the present invention to provide a synchronizing device for a transmission configured to reduce the frictional force on the sliding surface between an insert key and a sleeve to enable smooth shifting.

[Means for solving problems]

In order to achieve the above object, this invention is constructed as follows. In other words, this idea is
Synchronization in a transmission comprising a sleeve movably disposed at a distance from the outer periphery of a clutch hub, an insert key disposed between the sleeve and the clutch hub, and an insert key spring biasing the insert key radially outward. The device includes a guide portion provided on the insert key inserted in the axial direction of the clutch hub, and a roller rotatably attached to the center portion of the insert key and capable of contacting the sleeve when the sleeve moves. The present invention relates to a synchronizing device in a characteristic transmission.

Further, in the synchronizing device of this transmission, the roller is rotatably supported by a pin attached to the insert key.

Further, in this synchronizing device for a transmission, a recessed portion and a protruding portion are formed on both sides of the recessed portion in a radially outer central portion of the insert key, and the pin is attached to the protruding portion.

Furthermore, in the synchronizing device of this transmission, the roller is disposed within the recess.

[Effect]

This invention is constructed as described above and operates as follows. In the synchronizing device for a transmission according to this invention, an insert key is arranged between the clutch hub and the sleeve, the insert key has a guide portion with a sufficient guide length, and the roller can be freely rotated on the insert key. Therefore, the side surface of the roller is not twisted and tilted relative to the insert key.

Since the insert key is inserted parallel to the axial direction of the clutch hub, even if the insert spring that presses the insert key outward and supports it is twisted, the guide part of the insert key Because there is a sufficient amount of force, the roller does not tilt in the shift direction, the sleeve pushes down the insert key against the spring force of the insert spring, the roller rotates smoothly, and the roller functions as a rolling bearing. The sleeve can be smoothly moved in the shifting direction, that is, the sliding direction, by the rolling of the rollers.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a synchronizing device in a transmission according to this invention will be described in detail with reference to the drawings.

In FIG. 1, a synchronizer in a transmission according to the invention is indicated generally by the reference numeral 10. The clutch hub 3 in the synchronizer 10 is fixed to the main shaft by spline fitting (not shown). Sleeves 1 are arranged around the outer periphery of the clutch hub 3 and spaced apart by a predetermined distance. An input shaft gear and a main shaft gear (not shown) are arranged on both sides of the clutch hub 3 and the sleeve 1 via a block ring 6.

An axial groove 16 is formed on the outer periphery of the clutch hub 3, and the insert key 5 is fitted into the groove 16 so as to be positioned therein. The insert key 5 is inserted parallel to the axial direction of the clutch hub 3, and has a guide portion with a sufficient guide length. The insert key 5 is located between the clutch hub 3 and the sleeve 1, and an insert spring 2 contacts the inside of the insert key 5, and the insert key 5 is biased radially outward by the insert spring 2. That is, the splines 8 of the sleeve 1 are pressed against each other.
is maintained in contact with the

In FIG. 2A and its sectional view in FIG. 2B, only the insert key 5 is shown more clearly. The insert key 5 has a ridge or protrusion 15 formed in the center on the outer circumferential side, and a recess 13 into which the roller 7 is fitted. An attachment hole 12 is bored in the protrusion 15, and the pin 4 is attached to the attachment hole 12. The roller 7 is rotatably supported by the insert key 5 by a pin 4.

Therefore, the protrusions 15 are provided on both sides of the roller 7. In addition, the protrusion 15 of the insert key 5 and the roller 7 supported by the protrusion 15
is set to be located within the circumferential recess 14 formed in the center of the spline 8 of the sleeve 1.

Synchronizer 10 in a transmission according to this invention
is constructed as described above and operates as follows. The state of the synchronizer 10 shown in FIG. 1 is a neutral state, and is not in a state in which power can be transmitted. In this state, insert key 5
is constantly pressed against the spline 8 of the sleeve 1 by the insert spring 2.

First, when the synchronizer 10 operates to change gears, for example, as shown in FIG. 3, a fork (not shown) moves the sleeve 1 to the right as indicated by the arrow. Thereby, the shoulder portion 17 of the spline 8 of the sleeve 1 comes into contact with the roller 7, and the insert key 5 is pushed down radially inward against the spring force of the insert spring 2. Therefore, the insert key 5 moves radially inward,
Furthermore, the insert key 5 abuts against the blocking ring 6.

Furthermore, when the sleeve 1 is moved to the right as shown by the arrow, the spline 8 of the sleeve 1 rides on the roller 7 attached to the insert key 5.
The sleeve moves to the right as indicated by the arrow 1.
At this time, the roller 7 functions as a rolling bearing for the sleeve 1. When the sleeve 1 moves to the right, the splines 8 of the sleeve 1 come to mesh with the splines 9 formed on the outer periphery of the blocking ring 6.

Furthermore, when the sleeve 1 is moved to the right and the block ring 6 is moved to the right, the tapered surfaces of the block ring 6 and the main shaft gear, that is, the transmission gear (not shown) are pressed against each other and come into frictional contact. , are brought into synchronization with respect to their rotational speeds.

When this block ring 6 becomes synchronized with the gear shift gear, the insert key 5 and clutch hub 3 are also synchronized from the block ring 6 through the sleeve 1, and the sleeve 1 moves further to the right, causing the shift gear to become synchronized. The teeth or splines provided on the gear and the splines 8 of the sleeve 1 come to mesh with each other.

Therefore, power is transmitted to the transmission gear from the main shaft (not shown) through the clutch hub 3, insert key 5, and sleeve 1.

[Effect of idea]

The synchronizer in the transmission according to this invention is
It is configured as described above and has the following effects. That is, the synchronizing device in this transmission has an insert key arranged between the clutch hub and the sleeve, and a roller arranged so as to be sandwiched between the peaks or protrusions provided on the outside in the radial direction of the insert key. Since the insert key is rotatably attached to the insert key, the insert key acts as a relatively long guide against the side of the roller, and the roller does not tilt in the sliding direction of the sleeve. On the other hand, rollers function as rolling bearings.

Therefore, the frictional force on the sliding surface between the sleeve and the insert key is reduced, the sleeve can move extremely smoothly, and the speed change operation can be performed smoothly.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a synchronizer in a transmission according to this invention, Fig. 2 A is a front view showing the insert key in Fig. 1, and Fig. 2 B is a sectional view taken along line XX in Fig. 2 A. , Figure 3 is the first
4 is a cross-sectional view showing an example of a synchronizer in a conventional transmission, and FIG. 5 is a cross-sectional view showing another synchronizer in a conventional transmission. It is. 1...Sleeve, 2...Insert spring, 3...Clutch hub, 4...Pin, 5...Insert key, 6...Block ring, 7...Roller, 8, 9...Spline, 10...Synchronizer , 12...attachment hole, 13...recess, 15...protrusion.

Claims (1)

[Claims for Utility Model Registration] (1) A sleeve movably disposed at a distance on the outer periphery of the clutch hub, an insert key disposed between the sleeve and the clutch hub, and a radially outward biasing of the insert key. In the synchronizing device for a transmission equipped with an insert key spring, the guide part is provided on the insert key inserted in the axial direction of the clutch hub, and the synchronizer is rotatably attached to the central part of the insert key, and when the sleeve is moved, the A synchronizing device for a transmission, characterized in that it has a roller that can come into contact with a sleeve. (2) A synchronizing device for a transmission according to claim 1, wherein the roller is rotatably supported by a pin attached to the insert key. (3) Utility model registration claim 1, characterized in that a recessed portion and a protruding portion are formed on both sides of the recessed portion in the center portion of the radially outer side of the insert key, and the pin is attached to the protruding portion. A synchronizing device in the transmission described in 2. (4) A synchronizing device for a transmission according to claim 1, wherein the roller is disposed within the recess.