JP2001304411A - Speed change device for automatic transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a speed change device for an automatic transmission, in this invention, formed in a manner wherein a plurality of shift brackets can be placed in a shift condition. SOLUTION: A single shift bracket 9A is shifted by a shifter 7, even when the shifter 7, left as placed in this condition, is select moved to the other shift bracket 9D, a space of pawl parts 91A, 92A is ensured so as to prevent interference of the shifter 7 by the pawl parts 91A, 92B of the shift bracket 9A shifted with this shifter 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission for an automatic transmission used in an automobile or the like.

[0002]

2. Description of the Related Art Conventionally, in this type of automatic transmission, as shown in FIG. 10, guide grooves (22A, 22A) are formed on the surface thereof.
B, 22C, 22D) using the drum (2).
A pin integrally inserted from the shaft fork is fitted into the guide groove (22A, 22B, 22C, 22D) of 1). In this configuration, the pins rotate into the guide grooves (22A, 2A
2B, 22C, 22D) via which the shift fork moves the coupling.

[0003]

In the above-mentioned conventional drum system, for example, when a step jump shift is performed from the fifth speed to the second speed, if the speed is changed in the order of fifth speed → fourth speed → third speed → second speed, No. Therefore, the synchro mechanism can be changed to 4 speed, 3 speed, 2 speed
Since the gears are synchronized in order with the speed, the shift time becomes longer and a load is imposed on the synchronization mechanism.

Further, in the case of five forward steps and one reverse step, three or four shift forks are provided, and correspondingly, three or four guide grooves must be provided. There is a problem that the size becomes longer and the transmission becomes larger.

[0005] In order to solve the above problem, two drums are used, the operation of the fork is shared, and each of the two drums is independent.
It is conceivable to perform a shift operation using two mechanisms, but when using an actuator provided with control to appropriately move two drums, two large actuators are used to rotate two drums having a large torque. As a result, there is a problem that the transmission becomes large, the on-vehicle performance is remarkably deteriorated, the weight is increased, and the cost is increased.

In an attempt to reduce the size by using a select-and-shift mechanism, conventionally, when one shift is performed and then the next shift is performed, the previous shift is returned to the original position and all the positions are set to neutral before the next shift. Must be performed, and two or more shift brackets cannot be shifted, so that two or more shift brackets are shifted to realize multi-stage with a small number of parts. In the case of a transmission that requires a locked state or a twin clutch type transmission that has two clutch discs and two input shafts and that changes the input by switching the input, a select and shift mechanism cannot be adopted. There's a problem.

[0007]

According to the present invention, as a means for solving the above-mentioned conventional problems, a pair of right and left claws are provided on each shift bracket (9) of a plurality of shift brackets (9). A shifter (7) for shifting the shift bracket (9) is disposed so as to fit between the claws of the shift bracket (9), and one or two shift brackets (9) are provided. The above is shifted to the right or left by the shifter (7) and the shifter
When the shifter (7) is in the neutral state, the shifter (7) can slide on the shift bracket (9) in which a plurality of shift brackets (9) are arranged without being interfered by the claw portions of the shift bracket (9). It is an object of the present invention to provide a transmission in which a gap between right and left claws of a shift bracket (9) is secured. The transmission includes an actuator as a mechanism for shifting the shifter (7) right and left and sliding on the shift bracket (9).
(15, 16) and the surrounding thread groove (1A)
Is cut off, a select fork (4) protruded from a boss (5) screwed to the select shaft (1), and a spline groove (6A) are cut out therearound. A shaft shift (6) and a boss (8) that is fixed in rotation by meshing with a spline groove (6A) of the shaft shift (6) and is slidable along the shift shaft (6). The shift fork (7) comprises a plurality of arranged shift brackets (9) slidably fitted to a rod (10).
(4) is fixedly connected to the boss (8) of the shifter (7) in the boss sliding direction freely in the rotation direction, and
The shifter (7) is shifted left and right by rotating the shift shaft (1) and shift shaft (6) using the actuators (15, 16).
(9) is to be slid.

[0008]

[Function] When the select shaft (1) is rotated in the forward or reverse direction, the select fork (4) slides in the forward or reverse direction along the select shaft shaft (1) via the boss (5). The select fork (4) is the shift shaft (6)
Since the shifter (7) is connected to the boss (8) of the shifter (7) supported by the shifter (7), the shifter (7) is also pushed by the select fork (4) via the boss (8) and moves along the shift shaft (6). To slide forward or backward. When the shifter (7) reaches the predetermined shift bracket (9), select shaft
Stop the rotation of (1) and rotate the shift shaft (6) in the forward or reverse direction. With the rotation of the shift shaft (6), the shifter (7) rotates leftward or rightward from the neutral position, and one of the claws of the shift bracket (9) is rotated.
(91 or 92), the shift bracket (9) is slid left or right along the rod (10) to move the coupling and shift is performed. After shifting, rotate shift shaft (6) and shifter (7) to shift bracket.
Return to the neutral position between the claws (91, 92) of (9), rotate the select shaft (1) in the forward or reverse direction, and shift the shifter (7) with the select fork (4) to the shift shaft (6). Slide forward or backward along
The shifter (7) is moved onto another predetermined shift bracket (9), and the shift is performed in the same manner. In this case, the shifter (7) slides on the claw (9) of the shift bracket (9).
1,92).

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention is shown in FIGS. In the figure, (1) is a select shaft, a thread groove (1A) is provided on the peripheral surface of the select shaft (1), and both ends are rotatably supported by brackets (2, 3), The select shaft (1) has a select fork
The boss (5) from which (4) is sent out is screwed.

A shift shaft (6) is provided with a spline groove (6A) on the peripheral surface of the shift shaft (6), and both ends are rotatably supported by brackets (2, 3). A boss (8) from which a shifter (7) is extended is fixed to the shift shaft (6) and is slidably meshed with the shift shaft (6) along the shift shaft (6).

A select fork (4) mounted on the select shaft (1) is connected to a boss (8) of a shifter (7) mounted on the shift shaft (6). (4) is the boss of the shifter (7)
(8) is slidably fitted in the groove (8A), so that the select fork (4) is fixed in rotation with respect to the select shaft (1), and further, the boss (8) of the shifter (7) Shift shaft of boss (8) freely in the direction of rotation of
It is fixed in the sliding direction along (6).

A plurality (four) of shift brackets (9A, 9B, 9C, 9D) are arranged near the shift shaft (6) along the shift shaft (6). 9A, 9B, 9C, 9D) on both sides of the claw (91A, 92A, 91B, 92B, 91
C, 92C, 91D, and 92D) are projected, and each shift bracket (9A, 9B, 9C, 9D) is slidably supported by a rod (10A, 10B, 10C, 10D).

The select shaft (1) and the shift shaft (6) are rotated in forward and reverse directions by actuators (15, 16) via reduction gears (11, 12, 13, 14), respectively. Since the select actuator (15) has a small rotational load on the select shaft (1), it is possible to use a small motor having a lower torque than the shift actuator (16).

In the above structure, when the select shaft (1) is rotated in the forward or reverse direction by the select actuator (15), the select fork (4) is moved to the boss.
Slide in the forward or reverse direction along the select shaft (1) via (5). As the select fork (4) slides, the shifter (7) mounted on the shift shaft (6) slides forward or backward through the boss (8). In this way, the shifter (7) can be positioned on any of the selected shift brackets (9A, 9B, 9C, 9D).

When the shifter (7) reaches the selected shift bracket (9), the operation of the actuator (15) is stopped, and then the shift shaft (6) is rotated in the forward or reverse direction by the shift actuator (16). In this case, the shifter (7) rotates leftward or rightward from the neutral position, and the claw portions (91, 9) of the shift bracket (9) are rotated.
2) is pushed by a shifter (7), and the shift bracket (9) is slid leftward or rightward along a rod (10) to perform a shift via a coupling (not shown).

When performing another shift, the actuator (16) is operated to return the shifter (7) to the neutral position, and the actuator (15) is operated to operate the shifter (7).
Is moved onto another shift bracket (9), and the actuator (16) is operated to shift the shift bracket (9) leftward or rightward by the shifter (7) to perform another shift.

The operation of the above-mentioned select-shift is shown in FIGS.
Is described in detail. The state shown in FIG. 4 is a neutral state of the shifter (7) on the shift bracket (9A). From this neutral state, as shown in FIG. 5, the shifter (7)
Is rotated in the direction of arrow A, the claw (92A) is pressed, and the shift bracket (9A) is slid rightward to shift.

Next, as shown in FIG. 6, the shifter (7) is rotated in the direction of arrow B to return to the neutral position, and while the shift bracket (9A) is being shifted, the shifter (7) is moved in the direction of arrow C. , And reach the shift bracket (9D). When such shifter (7) is selected,
Even if the shift bracket (9A) or another shift bracket is left or right shifted, the pawls (91, 92) of the shift bracket (9) should not interfere with the select movement of the shifter (7). Secure the interval between copies.

When the shifter (7) reaches the upper position (9D) of the shift bracket, the shifter (7) is rotated in the direction of arrow D as shown in FIG. 7 to slide the shift bracket (9D) to the left.

Then, as shown in FIG. 8, the shifter (7) is rotated in the direction of arrow E to return to the neutral position, and the shifter (7) is moved in the direction of arrow to reach the shift bracket (9A). Then, as shown in FIG. 9, the shifter (7) is turned in the direction of arrow G to shift bracket (9A).
To the neutral position. Even when the shifter is selectively moved in the direction of the arrow, the shift bracket (9
Even if D) or another shift bracket remains shifted, the select movement of the shifter (7) is not interfered by the claw portion of the shift bracket.

[0021]

As described above, according to the present invention, when the shifter is selectively moved to another shift bracket while any one of the shift brackets is being shifted, the claw portions of the shift bracket do not interfere with the shifter. , One or more arbitrary shift brackets can be respectively shifted in arbitrary directions. Therefore, a transmission that requires a state in which two or more shift brackets are shifted in order to realize a multi-stage with a small number of parts, or provided with two clutch discs and two input shafts to selectively select input shafts In the case of a twin clutch type transmission that changes gears by switching, the transmission can be downsized compared to the drum type, and when using an actuator, a relatively small select actuator other than one shift actuator is added Just do it. Even in the step-by-step operation, it is not necessary to shift in order as in the drum system, and the shift bracket to be shifted at once can be shifted.

[Brief description of the drawings]

 1 to 9 show an embodiment of the present invention.

FIG. 1 is a side view

FIG. 2 is a plan view

FIG. 3 is a sectional view of a shift bracket portion. FIGS. 4 to 9 show the operation of the transmission.

FIG. 4 is an explanatory front view of a neutral state. FIG. 4 is an explanatory plan view of a neutral state.

FIG. 5 is a front explanatory view of a right shift state. B is a plan explanatory view of a right shift state.

FIG. 6 is a front explanatory view of a state of movement to another shift bracket. B. A plan explanatory view of a state of movement to another shift bracket.

FIG. 7A is a front explanatory view of another shift bracket left shift state. FIG. 7B is a plan explanatory view of another shift bracket left shift state.

8 is a front view showing a state of moving to a front shift bracket. FIG. 8b is a plan view showing a state of moving to a front shift bracket.

FIG. 9 is a front view showing a state in which the front shift bracket is returned to a neutral position. FIG. 9B is a plan view showing a state in which the front shift bracket is returned to a neutral position.

FIG. 10 is an explanatory view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Select shaft 1A Screw groove 4 Select fork 5 Boss 6 Shift shaft 6A Spline groove 7 Shifter 8 Boss 9 Shift bracket 10 Rod 15, 16 Actuator 91, 92 Claw portion

Claims (3)

[Claims] A pair of left and right claws are provided on each of the plurality of shift brackets;
A shifter for shifting the shift bracket is arranged to fit between the claw portions of the shift bracket,
When one or more of the shift brackets are shifted right or left by the shifter and the shifter is in the neutral state, a plurality of the shifters are arranged without interference with the claw portion of the shift bracket. A transmission for an automatic transmission, wherein a gap between left and right claws of each shift bracket is secured so as to be able to slide on the shift bracket. 2. The transmission according to claim 1, wherein an actuator is used as a mechanism for shifting the shifter left and right and sliding on the shift bracket. 3. A select shaft having a thread groove on its periphery, a select fork extending from a boss screwed to the select shaft, a shift shaft having a spline groove on its periphery, and the shift shaft. A shifter protruding from a boss which is fixed in rotation by being engaged with a spline groove of the shaft and is slidable along the shift shaft, and a plurality of slidably fitted to a rod. The shift fork is arranged in an array, and the select fork is fixedly connected to the boss of the shifter in the rotational direction so as to be fixed in the boss sliding direction, and the select shaft and the shift shaft are rotated using an actuator. 2. The shifter according to claim 1, wherein the shifter is shifted left and right and slides on a plurality of shift brackets. Of the automatic transmission transmission