JPH0518196Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a transfer switching device.
In particular, in order to facilitate switching while driving, the ratio of the working length from the fulcrum to the shift shaft connection point (hereinafter referred to as lever ratio) to the arm length from the fulcrum of the transfer lever to the operating grip point should be set sufficiently. The present invention relates to a switching device that allows the user to switch between different positions.

[Conventional technology]

For example, a transfer system used in an automobile is a device that outputs an input from a transmission by switching it to either two-wheel drive or four-wheel drive, and to high speed, neutral, or low speed. The switching mechanism in this transfer generally has the following configuration. That is, the 2/4 shift shaft to which the shift fork for switching between 2-wheel drive and 4-wheel drive is fixed, and the high/low shift shaft to which the shift fork for switching between high speed, neutral, and low speed is fixed are parallel and axially aligned. Place it so that it can be moved. A lower end portion of the transfer lever is supported in the upper portion of the transfer case above the shift shafts so as to be able to swing back and forth, left and right, and a shift rod integrally formed at the lower end of the lever is fixed to the shift shafts. Engage the shift head. As a result, by swinging the transfer lever in the longitudinal or lateral direction of the vehicle, either of the above-mentioned shift shafts is selected and shifted. reference).

[Problem that the invention attempts to solve]

By the way, the high/low shift axis mentioned above is used to switch between high speed, neutral, and low speed.
In this case, it is required to be able to smoothly perform the above switching even while driving. In order to facilitate this switching while the vehicle is running, it is necessary to provide a synchronization mechanism in the clutch gear portion of the high and low gears that engage the high and low shift sleeves, and to increase the so-called lever ratio of the transfer lever. However, in the above-mentioned conventional switching mechanism, in order to increase the lever ratio, the transfer lever has to be extended upward, but in this case, the position of the gripping part of the lever becomes higher, and the operability decreases accordingly. There is a risk that

The present invention has been made in view of the above-mentioned conventional situation, and aims to provide a transfer switching device that can increase the lever ratio without increasing the position of the gripping portion of the transfer lever. .

[Means for solving problems]

The present invention provides a transfer switching device in which a 2/4 shift shaft and a high/low shift shaft are arranged in parallel, and a transfer lever is used to move either of the two shift shafts in the axial direction. A sub-shift shaft is disposed below and parallel to both shift shafts, and the shift heads extending downward are fixed to the high and low shift shafts as described in 2 and 4 above, and each shift head is selectively connected to the sub-shift shaft. Fixing the engaging drive arm, above the secondary shift shaft,
In addition, in 2 and 4 above, a transfer lever is swingably supported below the high-positioned high-low shift shaft, and the shift rod of the transfer lever is attached to a sub-shift head fixed to the sub-shift shaft. It is characterized by being engaged.

[Effect]

According to the transfer switching device according to the present invention, the transfer lever is connected to the sub-shift shaft disposed below the 2/4 shift shaft and the high/low shift shaft, so that the sub-shift shaft The fulcrum position of the transfer lever can be lowered by the lower position, and as a result, the lever ratio can be increased while keeping the gripping portion at the same height as before.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 to 6 are diagrams for explaining a transfer switching device according to an embodiment of the present invention. In the figure, reference numeral 1 indicates an automobile transmission to which the device of this embodiment is applied;
4-wheel drive low speed (4L) - neutral (N) - 4-wheel drive high speed (4H) - 2-wheel drive high speed (2H) according to the shift pattern shown in Figure 5. Transfer 3 switched to
It is composed of.

In the transmission 2, a clutch shaft 6 on which a clutch device 5 is mounted is arranged in a transmission case 4, and a large number of gears 7 are rotatably mounted, and a shift sleeve 8 is mounted so as to be movable in the axial direction. A second speed change shaft 1 has a first speed change shaft 9 disposed on the same axis as the clutch shaft 6, and a plurality of gears 10 meshing with the gear 7 are integrally formed.
1 is disposed parallel to the first transmission shaft 9. Note that 12a indicates each of the above shift sleeves 8.
This is a speed change mechanism that moves the gear shift lever to each speed change position, and is connected to a speed change lever 12c via an intermediate shaft 12b.

Transfer case 14 of the above transfer 3
Inside, a reduction shaft 15, a rear wheel output shaft 16, and a front wheel output shaft 17 are arranged in parallel and rotatably. Above the rear wheel output shaft 16, a 2/4 shift shaft 27 and a high/low shift shaft 28 are arranged parallel to the rear wheel output shaft 16 and movable in the axial direction. The shift fork 27a, 28a fixed to each shift shaft 27, 28 is connected to the 2/4 shift sleeve 16 mounted on the rear wheel output shaft 16.
b. It is engaged with the engagement groove of the high/low shift sleeve 16a.

Further, the rear end portion of each of the shift shafts 27, 28 is
They protrude into the switching case 14a attached to the rear end surface of the transfer case 14, and the protrusions have boss parts 29a and 30 of the 2 and 4 shift heads 29 and the high and low shift heads 30, respectively.
a is attached and fixed with a locking pin 31.
Both shift heads 29, 30 are integrally formed with head arms 29b, 30b extending downward, and engagement recesses 29c, 30c are formed in opposing surfaces of the arms 29b, 30b.

A sub-shift shaft 32 is disposed in the switching case 14a in parallel with both the shift shafts 27, 28. Both ends of the sub-shift shaft 32 are rotatably and axially movably supported by an end wall 14b of the transfer case 14 and a support boss portion 14c protruding into the switching case 14a. Further, a boss portion 33a of a drive arm 33 is attached to the middle of this sub-shift shaft 32, and a locking pin 3
4, and the drive claw 33b integrally formed on the drive arm 33 is located between the fork claws 29b and 30b of the 2/4 shift fork 29 and the high/low shift fork 30, and is engaged. It can be selectively engaged with either of the recesses 29c and 30c.

Further, the drive arm 3 of the sub shift shaft 32
A boss portion 35a of a stopper member 35 is mounted slightly forward of the stopper member 35 and fixed with a locking pin 34, and a stopper claw 35b extending upward is integrally formed on the stopper member 35. This stopper pawl 35b operates when the drive arm 33 is selected to the 2/4 shift shaft 27 side.
It faces the front end surface 30d of the low shift head 30 in the axial direction, and is positioned outside the high/low shift head 30 when selected on the high/low shift shaft 28 side.

Furthermore, a boss portion 36a of a sub-shift head 36 is attached to the rear portion of the sub-shift shaft 32, and is fixed with a locking pin 37. A transfer lever 39 is inserted into the connecting recess 36b formed in the upper part of the sub shift head 36 via a bearing 38.
A connecting ball portion 39b of a shift rod 39a formed at the lower end of the shift rod 39a is inserted. The support ball portion 39c of the transfer lever 39 is located within a support case portion 14d formed in the switching case 14a.
It is supported via a bearing 40 so as to be swingable in the front and rear and left and right directions. This support case portion 14d is formed at a lower position than both the shift shafts 27, 28, so that the support ball portion 39c, which is the fulcrum of the transfer lever 39,
It is lower than 28. Note that 41 is a biasing device (see FIG. 2) that biases the sub shift head 36 so that the drive arm 33 is pressed toward the 2/4 shift head 29;
This is a dust cover that seals between the opening 4d and the transfer lever 39.

Next, the effects of this embodiment will be explained.

In the switching device of this embodiment, by swinging the transfer lever 39 in the left and right direction,
The sub shift shaft 32 rotates, and its drive arm 33
is selectively engaged with either the 2/4 shift head 29 or the high/low shift head 30, and by swinging it back and forth, the auxiliary shift shaft 32 moves back and forth, and the above-mentioned engagement occurs. A shift operation is performed to move the shift head in the axial direction.

At this time, in this embodiment, the shift shafts 27, 28
Another sub shift shaft 32 is disposed further downward,
Since the transfer lever 39 is connected to the auxiliary shift head 36 fixed thereto, the support ball portion 39c of the lever 39, that is, the fulcrum, can be supported below the shift shafts 27, 28. Therefore, from the fulcrum 39c to the upper end gripping portion 39
The arm length, which is the distance from the fulcrum 39c to the connecting ball portion 39b, can be made long, and the ratio of the arm length to the action length, which is the distance from the fulcrum 39c to the connecting ball portion 39b, can be made large. As a result, a synchronizing mechanism can be provided to facilitate high/low switching during driving.

For example, in the 4H state, the high/low shift shaft 28 is located on the high speed (H) side, the 2/4 shift shaft 27 is located on the 4-wheel drive side, and the drive arm 33 of the sub shift shaft 32 is located on the high speed (H) side. It is biased towards the 2/4 shift fork 29 side. That is, since the high/low shift shaft 28 is in a state where it can move in the axial direction, if a thrust force is applied to the high/low shift shaft 28 in the axial direction N side via the shift sleeve 16a, the high/low shift There is a risk that the shaft 28 will move toward the N side, causing so-called gear slippage. On the other hand, in this embodiment, the stopper pawl 35b of the stopper member 35 is connected to the N of the high/low shift fork 30, as shown by the solid line in FIG.
It is located at a position facing the side end surface 30d,
Therefore, even if a thrust force is applied to the shift sleeve 16a, movement of the high/low shift shaft 28 can be prevented, and as a result, gear slippage can be completely prevented.

In addition, when the high/low shift shaft 28 is selected, the stopper pawl 35b is connected to the high/low shift fork 30, as shown by the dashed line in FIG.
The high/low shift shaft 2
The shift operation of No. 8 can be performed without any trouble as before.

[Effect of idea]

As described above, according to the transfer switching device according to the present invention, the sub shift shaft is disposed below the 2/4 shift shaft and the high/low shift shaft, and the 2/4 shift shaft is disposed below the high/low shift shaft.
4. Connect the shift head of the high/low shift shaft and the drive arm of the sub shift shaft, and connect the transfer lever to the sub shift shaft, setting the fulcrum position of the transfer lever to 2 and 4, and the drive arm of the sub shift shaft. Since it is lower than the higher shaft, the lever ratio can be increased without increasing the position of the gripping portion of the transfer lever.

[Brief explanation of drawings]

1 to 6 are diagrams for explaining a transfer switching device according to an embodiment of the present invention, in which FIG. 1 is a sectional side view thereof, FIG. 2 is a sectional rear view thereof, and FIG. 3 is a sectional view thereof. 4 is a cross-sectional rear view of the drive arm portion thereof, FIG. 4 is a cross-sectional rear view of the stopper member portion thereof, FIG. 5 is a schematic diagram of its shift pattern, and FIG. 6 is an automobile transmission to which this embodiment device is applied. FIG. In the figure, 3 is transfer, 27 is 2.4
Shift shaft, 28 is a high/low shift axis, 29 is a 2/4 shift fork, 29b, 30b is a shift head, 30 is a high/low shift fork, 32
35 is a sub-shift shaft, 35 is a drive arm, 36 is a sub-shift head, 39 is a transfer lever, and 39a is a shift rod.

Claims (1)

[Scope of utility model registration request] 2/4 shift axes to which shift forks for switching between 2-wheel drive and 4-wheel drive are fixed, and high/low shift axes to which shift forks for switching between high speed, neutral, and low speed are fixed, move in parallel and in the axial direction. The transfer shaft is arranged such that it can be switched to any one of four-wheel drive low speed, neutral, four-wheel drive high speed and two-wheel drive high speed by moving both shift shafts in the axial direction with a transfer lever. In the switching device described above, a sub-shift shaft parallel to the above-mentioned 2 and 4 shift shafts and high and low shift shafts is arranged so as to be rotatable and axially movable. - A shift head extending downward is fixed to the low shift shaft, and a drive arm capable of selectively engaging with either of the two shift heads is fixed to the sub shift shaft, and above the sub shift shaft, the drive arm is fixed to the sub shift shaft. , the lower part of the transfer lever is supported so as to be slidable in the front, rear, left and right directions below the high-positioned shaft among the high and low shift shafts,
A transfer switching device characterized in that a shift rod formed at the lower end of the transfer lever is engaged with a sub-shift head fixed to the sub-shift shaft.