JPH0716112Y2 - Gearbox synchronizer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a BorgWarner type synchronizer for smoothing the shifting operation of a manual transmission.

[Prior Art] As a synchronizer of this type, as shown in FIG. 3, a synchronizer key 2 is incorporated in a groove formed on the outer periphery of a clutch hub 1 so as to be movable in the axial direction, and a synchronizer adjacent to the clutch hub 1 is provided. It is known that a cone 5 formed integrally with the clutch gear 4 is arranged inside the ring 3. The synchronizer key 2 is moved by the shifter sleeve 6 and comes into contact with the cone 5.

A synchronizer head pin 7 is provided so as to penetrate the synchronizer key 2, and the head pin 7 is pressed against the inner surface of the shifter sleeve 6 by a spring 8 provided in the hub 1.

[Problems to be Solved by the Invention] When the output of the engine is increased, the power transmission mechanism is strengthened by increasing the tooth width of the internal gear in the transmission accordingly. However, in recent years, the engine and the transmission have been designed to increase the output of the engine without increasing the size as much as possible. Therefore, the assembling width of the synchronizer described above is narrowed by the increase in the gear tooth width inside the transmission. Tend to be.

In particular, when the width of the shifter sleeve and the synchronizer key is narrowed in the synchronizer, the shifter sleeve 6 is neutralized as shown in FIGS. 4 and 5 due to variations in the parts of the synchronizer and assembly. When the synchro head pin 7 is moved from the relative position (FIG. 3) due to vibration or the like, the synchro head pin 7 may be displaced in the direction opposite to the moving direction of the sleeve 6 and may come off the shifter sleeve 6.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a transmission synchronizing device in which the synchronizing head pin does not come off from the shifter sleeve even if the assembling width is narrowed.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a clutch hub spline-fitted to a main shaft, and a clutch hub movably incorporated in a groove formed on an outer periphery of the hub. A synchronizer key, a shifter sleeve that moves the key, a synchronizer ring that rotates integrally with the hub when the key moves, a sync head pin that penetrates the key, and a synchronizer key that is provided in the hub. In a transmission synchronization device including a spring that presses the head pin against the inner surface of the shifter sleeve, a plate having a recess on the top surface is interposed between the head pin and the spring, and faces the recess. An auxiliary spring is provided in the head pin, and a steel ball engaging with the recess of the plate is arranged at the tip of the auxiliary spring. It is characterized by

[Operation] Even if vibration occurs when the shifter sleeve is moved, the auxiliary head of the synchro head pin presses the steel ball into the recess of the plate, so that the synchro head pin stays in the neutral position and is not likely to come off the shifter sleeve.

[Embodiment] Next, an embodiment of the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, an input gear 12a and a drive gear 12b are rotatably fitted to a main shaft 10 of a transmission via a bearing 11. The input gear 12a meshes with a counter gear of a counter shaft (not shown), and the drive gear 12b meshes with a driven gear (not shown). The main shaft 10 has a clutch hub 13
Are spline-fitted so as to rotate integrally with the main shaft 10.

Splines and grooves are formed on the outer circumference of the hub 13. A shifter sleeve 14 is fitted in the spline so as to be movable in the main axis direction, and a synchronizer key 15 is also incorporated in the groove so as to be movable in the main axis direction. A synchro head pin 16 is provided at the center of the key 15 so that the tip of the synchro head pin 16 is pressed against the inner surface of the sleeve 14 by a spring 17 provided in the hub 13 and fits into a groove 14a on the inner surface when in neutral. It is like this. Reference numeral 14b is an outer peripheral annular groove into which a shift fork (not shown) is fitted.
Adjacent to the shifter sleeve 14, synchronizer rings 18a and 18b are provided on both sides thereof. Teeth with which the splines of the sleeve 14 mesh when the sleeve 14 slides are formed on the outer circumferences of the rings 18a and 18b, and tapered surfaces are formed on the inner circumferences of the rings 18a and 18b.

Inside the synchronizer rings 18a and 18b, cones 20a and 20b integrally formed with the clutch gears 19a and 19b are arranged. The clutch gear 19a meshes with the input gear 12a,
The clutch gear 19b meshes with the drive gear 12b.

The characteristic structure of this embodiment is that in a synchronizing device in which the widths of the shifter sleeve 14 and the synchronizer key 15 are relatively narrowed, a plate 22 having a spherical concave portion 21 formed on the top surface is provided between the synchronizing head pin 16 and the spring 17. Intervened in
An auxiliary spring 23 is provided in the head pin 16 so as to face the recess 21, and a steel ball 24 that engages with the recess 21 of the plate 22 is arranged at the tip of the auxiliary spring 23.

Next, the operation of the synchronizer having such a configuration will be described.

In the neutral position shown in FIG. 1, synchronizer key 15 does not contact synchronizer ring 18a or 18b, so that each tapered surface of the ring does not contact cone 20a or 20b.

When the shifter sleeve 14 is shifted in the direction of arrow A by a shift fork (not shown) in this state, the steel ball 24 comes out of the recess 21 and the key 15 also moves with the sleeve 14,
15 presses the synchronizer ring 18b against the cone 20b of the clutch gear 19b. This causes the tapered surface of the ring 18b to make frictional contact with the cone 20b with a predetermined shift amount. When the gear is further shifted, the synchronization starts, and by this synchronization, the sleeve 14 separates the outer peripheral teeth of the synchronizer ring 18b to move forward and engages with the clutch gear 19b to complete the gear shift.

The characteristic operation of this embodiment is that in the synchronizing device in which the widths of the shifter sleeve 14 and the synchronizer key 15 are relatively narrowed, when the sleeve 14 is completely engaged with the clutch gear 19b, the elastic force of both springs 17 and 23 is increased. The steel ball 24 is
It is pushed back to 21, and the key 15 automatically returns to the neutral position shown in FIG. Even if vibration occurs in this state, the steel ball 24 of the synchro head pin 16 is pressed against the concave portion 21 of the plate 22 by the auxiliary spring 23, so that the synchro head pin 16 stays in the neutral position, does not come off from the shifter sleeve 14, and protrudes from the synchronizer key 15. There is no fear.

In the above example, the single-cone sync type synchronizing device has been described, but the synchronizing device of the present invention can naturally be applied to the double-cone synchronizing system.

[Effects of the Invention] As described above, according to the present invention, even if the widths of the shifter sleeve and the synchronizer key are narrowed, the steel balls are anchored in the recesses of the plate when the shifter sleeve engages with the clutch gear. Therefore, there is no danger of it coming off the sleeve.

As a result, even if the tooth width of the gear inside the transmission is increased and the assembling width of the synchronizer is narrowed, no trouble occurs during the shift, so the transmission does not have to be large in size,
It is possible to cope with an increase in engine output.

[Brief description of drawings]

FIG. 1 is a sectional view of a synchronizing device for a transmission according to an embodiment of the present invention. FIG. 2 is a diagram showing the situation after the shift. FIG. 3 is a sectional view of a synchronizer of a conventional transmission. 4 and 5 are views showing the situation after the shift. 10: spindle, 13: clutch hub, 14: shifter sleeve, 15: synchronizer key, 16: synchronizer head pin, 17: spring, 18a, 18b: synchronizer ring, 19a, 19b: clutch gear, 20a, 20b: cone, 21: Recess, 22: plate, 23:
Auxiliary spring, 24: Steel ball.

Claims (1)

[Scope of utility model registration request] 1. A clutch hub spline-fitted to a main shaft, a synchronizer key axially movable in a groove formed on the outer periphery of the hub, a shifter sleeve for moving the key, and the key. Gear shifter that includes a synchronizer ring that rotates integrally with the hub during movement of the hub, a synchronizer head pin that penetrates the key, and a spring that presses the head pin inside the hub against the inner surface of the shifter sleeve. In the synchronizer of the machine, a plate having a recess formed on the top surface is interposed between the head pin and the spring, an auxiliary spring is provided inside the head pin so as to face the recess, and a tip of the auxiliary spring is provided. A transmission synchronizing device is characterized in that a steel ball engaging with a recess of the plate is arranged.