JPH07253157A - Shift device for multi-speed transmission - Google Patents

Abstract

(57) [Abstract] [Purpose] The shift device is suitable for a multi-speed transmission having a structure in which the shift device is moved as easily as possible and is tightly restrained. [Structure] A shift device for a multi-stage transmission includes a vertically-placed shift bar 05 that is rotatable for selecting a shift line and vertically movable to enter a speed stage, and a vertically movable shift fork 12. I have. The shift finger 18 is fixedly connected to the shift rod 05, the shift fork 12 is movably supported on the guide rod 6, and the shift fork 12 has a projecting arm 41 having an engaging portion 42. When the shift bar 05 is in the angular position corresponding to each shift fork 12, the engagement portion 42 is matingly coupled with the corresponding shift finger 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertically-arranged shift rod which is rotatable for selecting a shift line and vertically movable for inserting a speed stage, and vertically for inserting a speed stage within a shift line. A shift device for a multi-stage transmission having a movable shift fork, and the shift fork can be moved via a shift finger by movement of a shift rod.

[0002]

2. Description of the Prior Art In a vertical transmission, such a shifting device is advantageous, for example in sports vehicles, because it allows it to be installed very low and in front of or after the transmission, but usually The shift forks have the disadvantage that they must be provided with their own movable guide rods with suitable restraining devices. These parts, which have to be housed inside the transmission case, require a large and heavy case for strength reasons, which is especially undesirable in sports vehicles. Furthermore, this device requires a shift connecting groove and a shift lever guide rod device outside the case.

The first type of construction which requires no guide rods is known from DE 3012764. The shift rod has a shift portion or web with which it can be swung and moved, and a restraining curved piece which can be swung about the same axis independently and immovable. Both parts have recesses for the shift fingers that project from the shift forks. The shift fork itself has a shift finger, which is disadvantageous in terms of manufacturing technology. Moreover, the construction of the shift forks is difficult if, in particular, the synchronous sleeves to be operated by the shift forks are not provided on the same shaft of the transmission, or if the gears on the shaft are provided with very small mutual spacing. become. The more speeds that are provided, the greater this difficulty.

In order to ensure a positive engagement of the shift fingers on all shift lines, the shift forks must be movably supported on the shift rod itself, which further limits the freedom of construction. In the case of this device, it is likewise difficult to carry out a positive restraint of the unshifted shift forks under the difficult circumstances mentioned above, and an additional guide roller is required.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a shift device which is as easy to move and restrains as possible and is suitable for a multi-stage transmission having a compact structure.

[0006]

To this end, according to the invention, a shift finger is fixedly connected to the shift rod, the shift fork is movably supported on the guide rod and the shift fork is engaged. And a shift bar at an angular position corresponding to each shift fork, the engaging portion fits into and engages the corresponding shift finger.

[0007]

The shift finger can be optionally formed as a simple component and can be provided at any location on the shift rod so that the shift fork lies in a plane perpendicular to the axis. As a result, the total length of the multi-stage transmission can be reduced. The overhanging arm of the shift fork is also in a plane perpendicular to its axis. The engaging portions are provided in different shift forks, and only one shift finger always engages with the corresponding engaging portion according to the rotational position of the shift rod.

In a preferred development of the invention, a restraining rod is provided which is swingable parallel to the shift rod and is swingably but movably connected to the shift rod via a swing lever. The overhanging arms that belong to the individual shift lines are aligned in the vertical direction and have arcuate connecting grooves that cooperate with the restraining rods, and each connecting groove has a recess in another place, and the restraining rods are in the neutral position. A flange is provided on each side of each of the connecting grooves, and the flange fits into each recess (claim 2).

As a result, the forcible, precise and absolutely sure constraint of the unselected shift forks is performed. Always 1
Only one shift fork is moved, the other shift fork is restrained. It is advantageous in manufacturing technology that all the connecting grooves can be machined with the same device, in which case the recesses can be milled individually.

By having the shift rod, the shift finger and the restraint rod in a common plane (claim 3), the precision and ease in manufacturing and assembling are further improved.

The invention also enables a particularly neat strategy for grading the spring force to overcome when changing the shift line. Therefore, the rocking lever has a radial projection, and a spring provided in a tangential direction acts on this projection (claim 4). Since the at least one rocking lever is close to the case wall, the case wall can accommodate the spring and no separate component is required for this accommodation.

According to another configuration of the present invention, additional restraint of the reverse speed can be performed. This constraint is not necessary if the forward and reverse speeds are on a common shift line.
A restraint lever that cooperates with the restraint rod is supported by a shift fork that shifts to the reverse speed so that the restraint lever can swing about an axis parallel to the restraint rod and can move on this axis.
The restraining lever is swingable against the force of the fourth spring,
Restraint is provided by the ability to move against the force of the fifth spring (claim 5).

[0013]

The present invention will be described below with reference to the drawings showing examples.

A transmission case is shown at 00 in FIG. The transmission case is divided laterally at cutting lines AA and BB, and cut off on the right side. Although the input shaft 01 and the output shaft 02 can be seen in FIGS. 2, 3, 5 and 6, the gears provided on these shafts may be of any size and arrangement within the scope of the present invention. Not at all. These gears can be connected to their shafts via a synchronizing sleeve, as is known, which is axially displaceable by means of a shift fork.

A shift fork 8 is engaged with the synchronizing sleeve 7 to enter the first speed and the reverse gear 1 / R (see also FIG. 6), and the synchronizing sleeve to enter the second and third speeds 2/3. Shift fork 10 is engaged with 9 (FIG. 5), shift fork 12 is engaged with synchronous sleeve 11 for entering fourth and fifth gears 4/5 (FIG. 2), and sixth gear 6 is engaged. Therefore, the shift fork 14 engages with the synchronization sleeve 13 (FIG. 3). The shift forks 8 are axially displaceable on the guide rod 64 and the shift forks 10, 12 and 14 are axially displaceable on the guide rod 06. Both guide bars 04,06 are mounted on the case 00 in a suitable manner. In this embodiment, there are two guide rods for installation reasons, but a single guide rod may be used.

A shift rod 05 is rotatably and movably supported in the case 00. This shift stick 05
In addition, a shift lever (not shown) can be attached directly or via its extension. The shift bar 05 is rotated to select a shift line, and is moved to enter each gear in the selected shift line. On the shift rod 05, the speed 1 / R, 2/3, 4
Shift fingers 16, 17, 18 and 1 for / 5 and 6
9 are connected by a grooved pin 20. As can be seen from FIG. 1, the shift finger 19 has a shift fork 14
Is engaged with the engagement pot 21.

One swing bush 22 is rotatably but immovably supported on each side of the case 00, and is fixedly connected to the swing levers 23 and 23 '. These rocking levers 23, 23 'hold a restraining rod 24 at their outer ends, and the restraining rod 24 extends parallel to the shift rod 05. The swing bush 22 has a slit 26 oriented in the axial direction, and an engagement pin 25 fixedly connected to the shift rod 05 is engaged with this slit 26. Therefore, the restraint rod 24 is swung when the shift rod 05 is rotated (a cylinder having the shift rod 05 as an axis is drawn).
When the shift bar 05 is moved, the shift bar 05 is not taken along, and therefore does not move in the axial direction. In the illustrated embodiment, all shift fingers 16, 17, 18, 19 and restraint bar 24 are in one plane. The restraint bar 24 has flanges 27 to 33.

In FIG. 2, the shift fork 1 for shifting to the fourth speed and the fourth speed on the transmission input shaft 01 is shown.
2 is shown. This shift fork 12 is generally at right angles to the axis and in the plane determined by the position of the synchronizing sleeve 11. A guide bush 40 in the shift fork 12 supports the shift fork axially displaceably on the guide rod 06, for example via a longitudinal ball bearing only shown schematically. Further shift fork 1
2 has an overhanging arm 41, and this overhanging arm 41 has an engagement pocket 42 as an engaging portion for the shift finger 18 and an arcuate connecting groove 43 (having the shift bar 05 as a geometric axis) on the side close to the shift bar 05. And the restraint bar 24 penetrates through the connecting groove 43. Therefore, the restraint bar 24 is connected to the connecting groove 4
It is possible to oscillate upward and downward within 3. The connecting groove 43 is expanded by a recess 44 at the height of the engagement pocket 42. The shift finger 18 engages with the pocket 4.
When engaging the two, the restraint bar 24 is in the recess 44 and only in this position the shift fork 12 is axially displaceable. At all other angular positions of the shift finger 18, the flanges 29, 30 on the restraint bar 24 prevent the shift fork 12 from moving.

In FIG. 5, the shift forks 10 act on the synchronizing sleeve 9 on the transmission output shaft 02. This shift fork 10 also has an overhanging arm 41, which is such that its engagement pocket 45 and recess 46 are provided at a lower location depending on the different angular position of the shift rod 05. Only different from other overhanging arms. The overhanging arm 41 may be a portion screwed to the shift fork. The recess 46 is the flange 30, 31 of the restraint bar 24.
Synergize with.

In FIG. 6, the shift fork 8 acting on the synchronizing sleeve is movably supported on the guide rod 04 and has a projecting arm 41, and this projecting arm 41 is seen from the other projecting arm 41 in the axial direction. Match. The overhanging arm 41 differs from the overhanging arm described above only in that the engaging pocket 47 and the recess 48 are provided at the bottom according to the angular position of the shift rod 05. Recess 48
Cooperate with the flanges 32, 33 of the restraint bar 24 as described above.

Therefore, according to the operation of the entire shift device, only one shift finger always corresponds to the engagement pocket of the overhanging arm depending on the angular position of the shift rod 05, and the restraint bar has the same recess of the overhanging arm. It corresponds. Thus, only one shift fork is ever movable and all other shift forks are restrained from moving.

FIG. 7 shows the shift force when selecting a shift line. In the illustrated embodiment, when the shift lever is released, the shift rod 05 is in the swinging position corresponding to the shift lines for the second speed and the third speed at the idling position. In order to reach the third and fifth shift lines, a slight spring force must be overcome, and to reach the sixth shift line from this shift line, a large spring force is necessary. I have to overcome my strength.

FIGS. 2 and 3 show a device which makes this possible. The rocking lever 23 has a radial projection 5
Since the swing lever 23 is a pressed metal plate part, the protrusion 50 can be obtained by bending it from the surface of the swing lever 23. The part that can be bent from the surface of the protrusion 50 can be brought very close to the case 00. The case 00 has two finger-shaped pieces 51, 52 that receive a spring load.
Is movably guided in the tangential direction. The finger 51 is pressed against the projection 50 by the first spring 53, thereby preventing the shift rod 05 from rotating to the shift line 1 / R. The second finger 52 is loaded by the second spring 54 and the third spring 55, and the spring 55 is remarkably strong and acts only when the finger 52 travels a specific stroke. Therefore, in order to reach the shift line 4/5, the second spring 54
The force of the third spring 55 must be overcome in order to reach the sixth shift line.

6 and 1 further show a restraint which prevents an undesired shift from the first gear to the reverse gear on the same shift line. Therefore, the restraint lever 60 is swingably supported by the shift fork 8. The restraint lever 60 is fixedly coupled to a support pin 61 as a shaft that is movable in the axial direction against the force of the fourth spring 62. The restraint lever 60 is further provided with a projection 6 formed by being bent at a right angle from the surface of the restraint lever 60.
I have 3. The pressing pin 64, which receives the load of the fifth spring 65, engages with this protrusion 63.

The action of this reverse speed limitation is as follows. In FIG. 1, at the first speed, the flange 32 has entered the recess 48 (FIG. 6). When you get out of the first gear,
The shift fork 8 is moved to the right to the idling position. Further movement in the same direction will cause the flange 33 to enter the recess 48, which must be prevented. That is, when the shift fork 8 reaches the neutral position, the restraining lever 60 hits the flange 32 from the left to prevent the shift fork 8 from moving to the right. However, at that time, if you want to enter the reverse speed, you must get out of the shift line 1 / R. This is the restraint rod 24 in FIG.
Means that is lifted. Upon exiting the first gear, the restraint lever 60 has already been moved slightly leftward from the flange 32 against the force of the fourth spring 62. Now, when leaving the shift line 1 / R for a short period of time, the spring 62 pulls the restraint lever 60 again to the right a little, so that the restraint lever 60 now contacts the periphery of the flange 32, thereby preventing the reverse gear from entering. There is no.

[Brief description of drawings]

FIG. 1 is a cross-sectional view taken along the axis of a shift device according to the present invention.

2 is a sectional view taken along the line AA of FIG.

3 is a sectional view taken along the line BB of FIG.

4 is a sectional view taken along the line EE of FIG.

5 is a cross-sectional view taken along the line CC of FIG.

6 is a sectional view taken along the line DD of FIG.

FIG. 7 is a diagram showing a force when selecting a shift line.

[Explanation of symbols]

 04,06 Guide rod 05 Shift rod 8,10,12,14 Shift fork 16,17,18,19 Shift finger 21,42,45,47 Engaging portion 41 Overhanging arm

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[Procedure amendment]

[Submission date] March 3, 1995

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 3]

[Figure 4]

[Figure 7]

[Figure 1]

[Fig. 2]

[Figure 5]

[Figure 6]

Claims (5)

[Claims] 1. A vertically arranged shift rod that is rotatable for selecting a shift line and vertically movable for entering a speed stage, and a shift fork vertically movable for entering a speed stage within a shift line. And a shift device in which the shift fork is moved through the shift finger by the movement of the shift rod, the shift finger (16, 17,
18, 19) is fixedly connected to the shift rod (05),
The shift forks (8, 10, 12, 14) are connected to the guide rods (0
4, 06) movably supported on the shift forks (8, 10, 12, 14) by engaging portions (121, 42, 4).
5, 47) having a flared arm (41) with a shift rod (05) on each shift fork (8, 10, 1).
2, 14) at the angular position corresponding to the engaging portion (2
1, 42, 45, 47) corresponds to the shift finger (1
6,17,18,19), and a shift device for a multi-speed transmission, characterized by being fitted and coupled. 2. A restraining rod (24) capable of swinging parallel to the shift rod (05) is provided, and the swing lever (23,
23 ') is swingably but immovably connected to the shift bar (05) via the shift bar (05), and the overhanging arms (41) belonging to the individual shift lines are aligned in the longitudinal direction and It has an arcuate connecting groove (43) that cooperates with the restraining rod (24), each connecting groove (43) has a recess (44, 46, 48) in another place, and the restraining rod (24) is in a neutral position. Flanges (27, 2) on each side of each connecting groove (43)
Shift device according to claim 1, characterized in that it has eight, twenty-nine, thirty, three, thirty-one, thirty-two and thirty-three), which flanges fit into the respective recesses (44,46,48). 3. A shift rod (05) and a shift finger (1)
Shift device according to claim 2, characterized in that the locking rod (24) is in a common plane. 4. The rocker lever (26) has a radial projection (5).
0) and tangentially provided springs (53, 54,
Shift device according to claim 2, characterized in that 55) acts on this projection (50). 5. A restraint lever (60) cooperating with the restraint rod (24) has a shaft (61) parallel to the restraint rod (24) on a shift fork (8) for shifting to a reverse speed.
Is supported so as to be swingable around and movable on this axis, the restraining lever (60) is swingable against the force of the fourth spring (62), and the fifth spring (65). The shift device according to claim 1, wherein the shift device is movable against the force of the shift device.