JPS6111784Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is used by incorporating it into a shift control system in order to adapt it to the regular shift pattern of the shift lever when only one pair of transmission gears is misaligned. The present invention relates to a shift reversing device.

Generally, the gear arrangement of a transmission is from the low speed side (that is, from the rear side) 1st gear → 2nd gear →
There are few shift reversal devices that are applied when only one pair of gears is in an irregular sequence, such as 4th gear → 3rd gear, or 2nd gear → 1st gear → 3rd gear → 4th gear. stomach. However, in some cases, a shift reversal device as shown in FIG. 3 has been proposed. That is, in this shift reversing device, for example, the fork 38 for 3rd and 4th speeds, which attempts to reverse the shift,
Separate from this, for example, it is supported slidably on the shaft of a fork shaft 3 for 1st and 2nd speeds. The protrusion 30a formed on the shift head 30 of the fork shaft 7 for 3rd and 4th speeds is
It engages with one end of a reversing lever 31 rotatably attached to a part of the case 1 by a pivot bolt 32. The other end of the reversing lever 31 is connected to a pin 38a formed on a part of the third and fourth speed fork 38. As a result, 3.4
The direction of the shift operation of the speed fork shaft 7 is reversed through the rotation of the reversing lever 31 and transmitted to the 3rd and 4th speed fork 38, which in turn is transmitted to the 1st and 2nd speed fork shaft 3. It will slide along.

However, in the shift reversing device shown in FIG. 3, the point of action of the operating load on the 3rd and 4th speed fork 38, that is, the pin 38a formed in a part of this fork 38, and the point where the fork 38 slides are guided. Since the fork shaft 3 for 1st and 2nd speeds is separated from the fork shaft 3 by a large distance, excessive force (such as prying force) is applied to the fork 38, which increases the shift operation load and deteriorates the operation feeling. Become.

In view of these conventional circumstances, this invention enables a reliable shift reversal operation to be performed in a transmission in which only one pair of gears is misaligned, in exactly the same way as the shift operation of a normal forkshaft. Another object of the present invention is to provide a shift reversing device that can accurately position the neutral position and shift position of a forkshaft to be shifted and reversed.

Next, the configuration of this invention will be explained in detail according to an embodiment of a transmission in which the gear arrangement is in the order of first speed, second speed, fourth speed, and third speed from the low speed side. The gear arrangement of this embodiment is such that the third speed is directly connected to the input shaft and output shaft of the transmission, and the fourth speed is an over-top gear.

First, in FIG. 1, which schematically shows the shift mechanism inside the transmission, two fork shafts 3 and 7 and one operation shaft 15 are connected to the front wall 1 of the transmission case 1.
A and the interme date plate 2 are supported at both ends so as to be shiftable along their respective axial directions.

Of the two forkshafts 3 and 7 mentioned above,
The shaft 3 located above in FIG.
A fork 4 for performing a second-speed shift operation is fixed by a slotted pin 5. That is, this fork 4 includes a clutch hub sleeve (not shown) that switches between the first speed and the second speed.
When the fork shaft 3 and the fork 4 are shifted to the right in FIG. 1, the first speed is obtained, and conversely, when the fork shaft 3 is shifted to the left, the second speed is obtained. It is. Further, the fork 8, which is also fixed to the other fork shaft 7 by the slotted pin 9, is
It fits into a clutch hub sleeve (see imaginary line in FIG. 2) that switches between third and fourth speeds. As for this forkshaft 7, by shifting it to the right in FIG.
speed is obtained, and by shifting to the left, the third
You can get speed. The relationship between the shift operation of the forkshaft 7 and the resulting shift is completely opposite to that of the forkshaft 3 for the first and second speeds. However, in the gear arrangement of the transmission in this embodiment, as described above, the arrangement of the third and fourth gears is irregular with respect to the first and second gears.

Furthermore, the reverse fork shaft 24 shown in FIG. 1 can be shifted in the same direction as the other shafts by means of the intermediate date plate 2 of the transmission case 1 and the part 27 of the extension housing. is supported at both ends. Regarding this forkshaft, please refer to the first
Reverse is obtained by shifting leftward from the neutral position shown in the figure.

Next, the fork shaft 7 for the 3rd and 4th speeds is
A shift reversal device for shifting and reversing will be described. First, a head 16 is fixed to the operating shaft 15 by a slotted pin 17, and an arm 18 is integrally formed on the head 16 so as to face the fork shaft 3 for the first and second speeds. As is clear from FIG. 2, the tip of this arm 18 is engaged with the first and second speed fork shafts 3 to prevent the operating shaft 15 from rotating. On the other hand, there is a shift reversal lever 21 in a part of the transmission case.
However, as is clear from FIG. 2, it is rotatably supported by a pivot bolt 22. Notches 23 are formed at both ends of the reversing lever 21, one of which is engaged with a projection 16a formed on the head 16 of the operating shaft 15, and the other is engaged with a third projection 16a formed on the head 16 of the operating shaft 15. It is engaged with a protrusion 8a formed on a fork 8 of a 4-speed fork shaft 7. As a result, the operating shaft 15
When the shift operation is performed, the fork shaft 7 is shifted from the operating shaft 1 through the reversing lever 21.
The reversal operation is performed in the opposite direction to the shift direction of No. 5. As a result, the shift directions of the third and fourth speed forkshafts 7 and the first and second speed forkshafts 3 correspond in the shift pattern of the speed change lever (not shown).

The first and second speed fork shafts 3 and the operating shaft 15 are extended to the right in FIG.
Engagement grooves 6 and 19 are formed at each end for selectively engaging a shift and select lever (not shown). Further, the shift head 25 fixed to the reverse fork shaft 24 has an engagement groove for engaging the shift and select lever at a position corresponding to the engagement grooves 6 and 19 of both the shafts 3 and 15. A groove 26 is formed.

Now, at the location of the intermittent date plate 2 shown in FIG. Interlock mechanism 2 using
0 is configured. Furthermore, the first and second speed forkshafts 3 are formed with three recesses 3a, 3b, and 3c that engage with detent balls (not shown) constituting the detent mechanism, and the reverse forkshafts 24 are Two recesses 24a and 24b are formed to engage with another detent ball (not shown) that also constitutes the detent mechanism. Although these detent mechanisms are disposed in different directions compared to the detent mechanism 11 of the third and fourth speed fork shafts 7, which will be described later, their configurations and functions are completely the same. However, since the shift position of the reverse fork shaft 24 is in one direction, the recess 24 that holds the reverse shift position
a and a recessed portion 24b that maintains the neutral position.

Further, the third and fourth speed forkshaft 7 is provided with a detent mechanism 11 at the location of the intermediary date plate 2. That is,
There are three recesses 7a on the outer periphery of the forkshaft 7.
7b and 7c are formed, and the detent ball 12 is inserted into the spring 13 with respect to one of these recesses.
is forced by. Note that the reference numeral 14 indicates a screw sheet. This detent mechanism 11 allows the shift position and neutral position of the third and fourth speed fork shafts 7 to be accurately determined. In addition, forkshaft 3 for 1st and 2nd speed and forkshaft 2 for reverse
4, the shift position and neutral position are also determined by the respective detent mechanisms described above.

In the above configuration, a shift operation to third and fourth speeds that requires shift reversal will be described. First, by selecting a shift and select lever (not shown), this lever is engaged with the engagement groove 19 of the operating shaft 15, and the operating shaft 15 is shifted in either the left or right direction in FIG. do. As a result, the fork shaft 7 for 3rd and 4th speeds is moved through the reversing lever 21.
is shifted together with the fork 8 in the opposite direction to the operating shaft 15, and through this fork 8 a desired shift is obtained. Each shift position of the forkshaft 7 is not affected by rattling between the protrusion 16a on the operation shaft 15 side, the protrusion 8a on the forkshaft 7 side, and the notch 23 of the reversing lever 21, and the shift position of the daytent mechanism 11 for accurate positioning.

Furthermore, the shift operation of the operating shaft 15 is smoothly operated with respect to the first and second speed fork shafts 3 in a state in which rotation is prevented by the arm 18 of the head 16, as described above. Also,
With this shift operation of the operating shaft 15, the first and second speed forkshafts 3 and the reverse forkshaft 24 are reliably locked in the neutral state by the action of the interlock mechanism 20.

As described above, in a transmission in which only one pair of transmission gears is arranged irregularly, the forkshaft that is required to perform a shift reversal can operate the operation shaft in exactly the same way as the shift operation of other forkshafts. By performing a shift operation, a shift reversal operation is performed, which has the advantage that the shift operation feeling of a transmission equipped with a shift reversal device can be maintained well. In particular, this invention provides an interlock mechanism on the operating shaft,
In addition, since the forkshaft that is shifted and reversed by this operation shaft is provided with a day tent mechanism, the neutral position and shift position of the forkshaft that is reversed is controlled to prevent rattling in the connection part of the shift reversal device. The detent mechanism allows accurate positioning without being affected. Moreover, since only the interlock mechanism needs to be provided on the operation shaft, the interlock mechanism can be easily installed.
Furthermore, it is not necessary to further form a recess for the daytent mechanism in the operating shaft through which the interlock pin passes, as in the above-mentioned embodiment, and this is advantageous in terms of maintaining the strength of the operating shaft. .

[Brief explanation of the drawing]

The drawings show an embodiment of this invention; Fig. 1 is a sectional view schematically showing the shift mechanism inside the transmission, Fig. 2 is a sectional view taken along the line - - of Fig. 1, and Fig. 3 is a conventional shift mechanism. FIG. 3 is a cross-sectional view of the reversing device corresponding to FIG. 2; 1... Transmission case, 3, 7...
Folkshaft, 15...Operating shaft, 16
...Head, 18...Arm, 20...Interlock mechanism, 21...Shift reversal lever.

Claims (1)

[Scope of utility model registration request] Parallel to each forkshaft in an automotive transmission, and similar to these forkshafts, to the transmission case,
An operating shaft is disposed along the axial direction so as to be shiftable, an arm is integrally extended from a head fixed to this operating shaft, and the tip of this arm is connected to a forkshaft that does not require shift reversal. engage to prevent rotation,
On the other hand, a shift reversing lever is rotatably attached to a part of the transmission case, one of the notches formed at both ends of the reversing lever is engaged with a protrusion formed on the head of the operating shaft, and the other is engaged with a protrusion formed on the fork of a forkshaft that is to perform a shift reversal operation, and furthermore, the operating shaft is provided with only an interlock mechanism between the fork shaft that does not require a shift reversal operation, and the fork that requires a shift reversal operation. A shift reversal device characterized by having only a day tent mechanism installed on the shaft.