JPH0237324Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The invention is a transfer control device, specifically a shift fork for switching between two-wheel drive and four-wheel drive, which is linked to a control lever. The present invention relates to a control device for a transfer, wherein a sleeve is supported on a fork shaft so as to be freely movable in the axial direction, and when the sleeve is moved by operating the control lever, switching to two-wheel drive or four-wheel drive is performed via the shift fork. .

(Prior art) In general, this type of control device has a switching sleeve for switching between two-wheel drive and four-wheel drive that is slidably provided in the transmission path in the transfer case, and the switching sleeve is operated to switch between two-wheel drive and four-wheel drive. The fork shaft is selectively switchable to wheel drive, and the fork shaft is pivotally supported in the same direction as the sliding direction of the switching sleeve,
A sleeve that interlocks with a shift fork for switching between two and four wheels is slidably provided on the fork shaft, and the shift fork is engaged with the switching sleeve so that the shift fork slides the switching sleeve. On the other hand, an operating lever is interlocked and connected to a sleeve supported on the fork shaft, and the swinging operation of the operating lever causes the shift fork to slide through the sleeve, and the shift fork slides the switching sleeve. By doing so, it is possible to selectively switch between two-wheel drive and four-wheel drive.

By the way, in the above-mentioned control device, if the rotational speeds of the front wheels and rear wheels are different when switching from four-wheel drive to two-wheel drive, the switching sleeve becomes locked, that is, the switching sleeve is not engaged. The shift fork may become locked, making it impossible to switch from four-wheel drive to two-wheel drive using the shift fork, and when switching from two-wheel drive to four-wheel drive, the switching sleeve may Even in the case where the switching sleeve is temporarily unable to move due to collision with the end face of the clutch gear, a locking phenomenon occurs in the same manner as described above, and the switching operation from 2-wheel drive to 4-wheel drive using the shift fork is prevented. There are things I can't do.

Therefore, previously, a sleeve was slidably supported on the fork shaft, and a waiting mechanism was interposed between the sleeve and the shift fork. That is, the shift fork was moved to a neutral position at one end of the sleeve in the axial direction. a first spring biasing the shift fork toward the neutral position, and a second spring biasing the shift fork toward the neutral position at the other end of the sleeve in the axial direction; , when the operating lever is switched, the lever slides the sleeve and compresses one of the springs, and when the shift fork is released from the locked state, the compression side They proposed a control device in which the shift fork is slid by the elastic force of a spring, and the switching operation between two-wheel and four-wheel drive is performed via the shift fork. (Patent Application No. 59-127211) (Problem that the invention attempts to solve) However, with the above-mentioned control device,
The lock state of the shift fork is released,
When the shift fork is slid by the elastic force of the compression side spring, the elastic force of another spring acts on the side of the shift fork opposite to the compression spring, so that the elastic force of the compression side spring is There was a problem in that the generated force was canceled out by the spring on the opposite side, and the sliding of the shift fork lacked smoothness and reliability.

The present invention was developed in view of the above problems, and the purpose is to provide a control device that allows the shift fork to slide smoothly when the shift fork is released from the locked state. There is something to do.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides a shift fork for switching between two and four wheels that selects between two-wheel drive and four-wheel drive, and a sleeve that is interlocked with a control lever. is supported on a forkshaft so as to be freely movable in the axial direction, and is configured to switch to two-wheel drive or four-wheel drive via the shift fork by moving the sleeve by operating the control lever. A spring is interposed between the shift fork and the sleeve, a first locking part that locks one end of the spring, and the spring of one of the shift fork or the sleeve located on the other end of the spring. a second locking portion that restricts movement only in a direction away from the spring; and the first locking portion of the restrictor is provided on the other of the shift fork or sleeve located on one end side of the spring. The first to receive the part
A receiving portion and a second receiving portion for receiving the other end of the spring are provided.

(Function) According to the present invention, when the shift fork is locked in either case of switching from two-wheel drive to four-wheel drive or from four-wheel drive to two-wheel drive, the sliding of only the sleeve causes the shift fork to lock. The spring is compressed via the regulating body, and when the shift fork is released from the locked state from this state, the shift fork can be smoothly slid to a predetermined position by the elastic force of the spring. be.

(Embodiment) An embodiment of the transfer control device according to the present invention will be described below with reference to the drawings.

The transfer shown in the drawing is a center-through type, and reference numeral 1 in the drawing is a transfer case, and inside the transfer case 1 are an input shaft 11 extending from the transmission T/M, and an input shaft 11 extending from the transmission T/M. A rear output shaft 12 extending coaxially with the shaft 11, and a counter shaft 13 and a front output shaft 14 arranged parallel to both shafts 11 and 12 are rotatably mounted.

The input shaft 11 rotatably supports a large-diameter drive gear 15, and clutch gears 15a and 12a are integrally formed at the shaft ends of the gear 15 and the rear output shaft 12, respectively.

Further, at the shaft end of the input shaft 11,
An input gear 16 co-rotating with the shaft 11
are assembled by spline fitting, and a high-low switching sleeve 2a is supported on the input gear 16 so as to be movable only in the axial direction, so that the sleeve 2a is selectively engaged with each of the clutch gears 15a or 12a. .

Further, the counter shaft 13 has a small diameter counter gear 13a that meshes with the large diameter drive gear 15 at one end, and a large diameter counter gear 13a at the other end.
The large-diameter counter gear 13b is meshed with a driven gear 17 rotatably supported by the rear output shaft 12.

Further, the rear output shaft 12 includes:
Output gear 1 co-rotating with the shaft 12
8, and a 2/4 wheel switching sleeve 2 is provided on the gear 18.
b is supported so as to be movable only in the axial direction.

On the other hand, one end of the driven gear 17 on the output gear 18 side is provided with a clutch gear 17a that engages with the two/four wheel switching sleeve 2b, while the other end of the driven gear 17 is provided with a sprocket 17b, and this sprocket 17b and the front It is interlocked and connected to a sprocket 14b provided at the shaft end of the output shaft 14 via a chain 19.

In the above configuration, by moving the high-low switching sleeve 2a, the gear can be switched to high gear, low gear, or neutral.More specifically, by moving the high-low switching sleeve 2a to the right in FIG. By meshing the input gear 16 with the clutch gear 12a of the rear output shaft 12, the gear can be switched to a high gear, and by moving the high-low switching sleeve 2a to the left in FIG. 1
6 and the clutch gear 15a provided on the large-diameter drive gear 15, the gear can be switched to low gear, and by meshing only the input gear 16 of the high-low switching sleeve 2a, the gear can be switched to neutral.

On the other hand, by moving the 2/4-wheel switching sleeve 2b to the right in FIG. 1, the sleeve 2b is brought into mesh with the output gear 18 and the clutch gear 17a provided on the driven gear 17, thereby switching to 4-wheel drive. and by moving the 2/4 wheel switching sleeve 2b to the left in FIG.
By disengaging the sleeve 2b and the clutch gear 17a, the vehicle can be switched to two-wheel drive.

Further, in the transfer case 1, as shown in FIGS. 2 to 6, a first forkshaft 3 is provided which extends coaxially with the input shaft 11.
and a second forkshaft 4 are spaced apart from each other by a predetermined distance and mounted in a parallel manner, and are not rotatably or axially movable, and the first forkshaft 3 is provided with a shift fork 30 for high-low switching and a first sleeve 31. The shift fork 30 for high-low switching is supported to slide freely and the high-low switching sleeve 2
a, and by sliding the first sleeve 31, the switching sleeve 2a is moved via the high-low switching shift fork 30 to perform high-low switching, while the second fork shaft 4 The shift fork 40 for switching between 2 and 4 wheels and a second sleeve 41 are slidably supported, and the shift fork 40 for switching between 2 and 4 wheels is connected to the shift fork 40 for switching between 2 and 4 wheels. By engaging the wheel switching sleeve 2b and sliding the second sleeve 41, the 2/4 wheel switching shift fork 4
0 to move the 2/4 wheel switching sleeve 2b to perform 2/4 wheel switching.

In the transfer control device as described above, a spring 42 is interposed between the second sleeve 41 and the shift fork 40 for switching between two and four wheels.
a first locking portion 43 that locks one end on the second sleeve 41 side of the spring 42 of the shift fork 40 located on the other end side of the spring 42;
The sleeve 2b is provided with a regulating body 45 having a second locking portion 44 that regulates only the movement in the direction of separation from the second sleeve 41, in other words, the movement in the direction of separation from the second sleeve 41, and located on one end side of the spring 42. , the first locking portion 41 of the regulating body 45
The first receiving part 46 that receives the spring 42
A second receiving portion 47 for receiving the other end is provided.

Specifically, the second sleeve 41 is
A cylindrical portion 41a extending in the axial direction is integrally formed at the side end of the shift fork 40 for four-wheel switching, and the first receiving portion 46 is provided at the base end of the cylindrical portion 41a, and the first receiving portion 46 is provided at the base end of the cylindrical portion 41a. The second receiving portions 47 are formed at the free end portions of 41a.

On the other hand, as shown in FIG. 7, the regulating body 45 is formed by bending both lengthwise ends of an elongated metal plate at right angles in the same direction, so that the bent portions are connected to the first and second ends.
The first locking portion 43 has a first insertion hole 43a that is loosely inserted into the cylindrical portion 41a, and the second locking portion 44 has a first insertion hole 43a that is loosely inserted into the cylindrical portion 41a. A second insertion hole 44a that is loosely inserted into the second forkshaft 4 is formed, and the first insertion hole 43a
The regulating body 45 is supported by the second forkshaft 4 by insertion into the cylindrical portion 41a and by insertion into the second forkshaft 4 through the second insertion hole 44a.

Further, the spring 42 interposed between the second sleeve 41 and the shift fork for switching between two and four wheels is loosely inserted into the cylindrical portion 41a, and one end of the spring 42 is inserted into the first end of the regulating body 45. At the same time, the other end of the spring 42 is brought into contact with a C-shaped receiving ring 48 movably interposed between the first and second receiving parts 46 and 47. The other end of the spring 42 is configured to be received by the second receiving portion 47 via the receiving ring 48.

Thus, the two-wheel drive position due to high gear (hereinafter
2H position) to 4WD position (hereinafter referred to as
4H position), that is, from the state shown in FIG. 3 to the state shown in FIG. 4, a temporary locking phenomenon occurs in the 2/4 wheel switching sleeve 2b, and the When the shift fork 40 is in a non-sliding state, as shown in FIG. 5, only the second sleeve 41 is slid in the right direction in the figure to compress the spring 42,
When the locking phenomenon of the 2/4 wheel switching sleeve 2b is released, the elastic force of the spring 42 acting through the regulating body 45 causes the shift fork 40 to also slide in the right direction in the figure. That's what I did.

Further, when shifting from the 4H position shown in FIG. 4 to the 2H position shown in FIG. 3, a temporary lock phenomenon occurs in the 2/4 wheel switching sleeve 2b, and the shift fork 40 does not slide. As shown in Figure 6, when the second
When only the sleeve 41 is slid to the left in the figure to compress the spring 42 and the locking phenomenon of the 2/4 wheel switching sleeve 2b is released, the spring 42 acts through the regulating body 45.
The resilient force causes the shift fork 40 to also slide to the left in the figure.

Further, in the embodiment shown in the figure, in addition to the shift fork 40 to the second sleeve 41, a second shift head 49 formed separately from the sleeve 41 is slidably mounted on the second shift shaft 4. The second sleeve 41 and the second shift head 49 are interlocked by a second interlocking means 6 which interrupts interlocking of both 41 and 49 when the second shift head 49 moves beyond a certain level. There is.

The second interlocking means 6 moves from the 2H position to the 4H position.
position, or when shifting from the 4H position to the 2H position, the second sleeve 41
is interlocked and connected to the second shift head 49 during other shift operations, that is, from the 4H position to the neutral position to the 4L position (four-wheel drive position with low gear), or from the 4L position to the neutral position. When shifting to the 4H position, only the second shift head 49 is moved. Specifically, the second through hole 61 through which the second lock ball 60 is passed through the second sleeve 41 is configured to move only the second shift head 49.
On the other hand, the second fork shaft 4 includes the shift fork 40 for switching between two and four wheels.
When located in the 4H position, the second through hole 61
A second fitting groove 62 is formed substantially opposite to the second fitting groove 62 .

The second shift head 49 is provided with a second contact surface 63 that comes into contact with the end surface of the second sleeve 41 during a shift operation from the neutral position to the 4H position. A second large-diameter cylindrical portion 49a into which the second sleeve 41 can be inserted is provided in series, and the second through-hole 61a is provided on the inner circumferential surface of the second large-diameter cylindrical portion 43 during a shift operation to the 4H position. a second recess 64 that faces the second lock ball 60 and receives the second lock ball 60;
has been established.

Further, in the illustrated embodiment, in addition to the shift fork 30 for high-low switching and the first sleeve 31 described above, a first shift head 3 is provided on the first fork shaft 3, which is formed separately from the first sleeve 31.
2 to freely slide in the axial direction, and the first sleeve 31 and the first shift head 32,
The first shift head 32 is interlocked with the first sleeve 31 by a first interlocking means 5 which allows the first shift head 32 to move within a certain range.

That is, the shift fork 30 for high-low switching
is fixed to the first sleeve 31 and its free end is engaged with the high-low switching sleeve 2a, while a first large diameter cylindrical portion 33 into which the first sleeve 31 can be inserted into the first shift head 32 established,
A first interlocking means 5 is provided between the large diameter cylindrical portion 33 and the first sleeve 31.

The first interlocking means 5 moves only the first shift head 32 during a shift operation from the 2H position to the 4H position or from the 4H position to the 2H position in high gear, and moves the first sleeve 31 during other shift operations. Said first
Specifically, the first sleeve 31 is formed with a first through hole 51 through which the first lock ball 50 passes, and the first shaft 3 is provided with the high and low shafts. A first fitting groove 52 is formed opposite to the first through hole 51 and receives the first lock ball 50 when the switching shift fork 30 is located at the high gear shift position.

The first shift head 32 is provided with a first contact surface 53 that comes into contact with the end surface of the first sleeve 31 during a shift operation from the 2H position to the 4H position.
A first recess 54 is provided on the inner circumferential surface of No. 3 to face the first through hole 51 and receive the first lock ball 50 during a shift operation to the 4H position.

Further, in the illustrated embodiment, the operating shaft 70 is rotatably supported on the transfer case 1, and the shift inner lever 7 is fixed to the lower end thereof.
One end of the shift inner lever 7 is connected to the first shift head 32, and the other end is connected to the second shift head 42.
The shift heads 32 and 42 are engaged with each other, so that rotation of the shift lever 7 causes the shift heads 32 and 42 to reversibly slide.

Further, an arm 71 is fixed to the upper end of the operating shaft 70, and the arm 71 and a control lever 8 disposed inside the vehicle are interlocked and connected by a push-pull cable 80.
The shift inner lever 7 is rotated by operating it in one direction.

In the figure, reference numerals 10a and 10b indicate stoppers for regulating the sliding range of the shift fork 30 for switching between high and low wheels, and stoppers 10c and 10d for regulating the sliding range of the shift fork 40 for switching between two and four wheels.

Next, the operation of the control device having the above configuration will be explained.

1 and 3 show a state in which the control lever 8 is shifted to the 2H position, and at this time, the contact surface 53 of the first shift head 32 is separated from the end surface of the first sleeve 31. , and the first configuring the first interlocking 5
The lock ball 50 has a first through hole 51 and a first fitting groove 5.
Therefore, only the first shift head 32 is slidable with respect to the first forkshaft 3, whereas the second lock ball 60 constituting the second interlocking means 6 is located between the second fork shaft 3 and the second fork shaft 3. located between the hole 61 and the second recess 64, and therefore
Shift head 49 and second sleeves 41 to 2/4
It is interlocked with the wheel switching shift fork 40 and can freely slide on the second shaft 4.

Also, at this time, the high-low switching sleeve 2a connects the input gear 16 and the rear output shaft 1 via the high-low switching shift fork 30.
2 clutch gear 12a, while the 2/4 wheel switching sleeve 2b is engaged with the 2/4 wheel clutch gear 12a.
It meshes only with the output gear 18 via the four-wheel switching shift fork 40, and therefore the power input from the transmission T/M via the input shaft 11 is transmitted only to the rear wheels in high gear. be done.

From this state, move the control lever 8 to the third position.
When the shift operation is performed to the 4H position shown by the imaginary line in the figure, the shift inner lever 7 is rotated by a predetermined angle counterclockwise from the position in FIG. 3 via the operating shaft 70. Accordingly,
The first shift head 32 moves a predetermined stroke leftward from the position shown in FIG. It faces the first through hole 51 .

On the other hand, the second shift head 49 and the second sleeve 41 to the shift fork 40 for switching two and four wheels are interlocked and connected via the second interlocking means 6.
moves a predetermined stroke in the right direction, as shown in FIG.

And the shift fork 40 for switching between 2 and 4 wheels.
As a result of this movement, the 2/4 wheel switching sleeve 2b moves to the right in FIG.
8 and the clutch gear 17 provided on the driven gear 17
This results in four-wheel drive in high gear.

On the other hand, in order to switch from the 4H position to the 2H position, it is sufficient to shift the control lever 8 from the 4H position to the 2H position, and by shifting the control lever 8, the shift inner lever 7 is moved from the position shown in FIG. The first shift head 32 rotates clockwise by a predetermined angle, and as the lever 7 rotates, the first shift head 32 moves to the right in FIG. The shift fork 40 is pushed by the second shift head 49 and moves to the left from the position shown in FIG.

And the shift fork 40 for switching between 2 and 4 wheels.
Due to this movement, the two-wheel/four-wheel switching sleeve 2b meshes only with the output gear 18, resulting in two-wheel drive in high gear.

Therefore, when switching the control lever 8 from the 4H position to the 2H position, the 2/4 wheel switching sleeve 2b may become locked due to the difference in rotation between the front wheels and the rear wheels, or the control lever 8 may be switched from the 2H position to the 4H position. When switching to the clutch gear 17a, when the 2/4 wheel switching sleeve 2b collides with the end face of the clutch gear 17a and becomes temporarily unable to slide, the clutch gear 17a engages with the 2/4 wheel switching sleeve 2b. The shift fork 40 for switching between two and four wheels also becomes locked, but
The second sleeve 41 is connected to the shift fork 40.
However, in any case, the second sleeve 41 can be moved relatively through the spring 42, so even if the shift fork 40 for switching between two and four wheels is temporarily locked as described above, the second sleeve 41
moves while compressing the spring 42.

Then, when the 2/4 wheel switching sleeve 2b is released from the locked state, the 2/4 wheel switching shift fork 40 slides to a predetermined position via the regulating body 45 due to the compression reaction force of the spring 42. Then, the two-wheel/four-wheel switching sleeve 2b is operated.

In the above embodiment, the second sleeve 41 includes:
Although the first and second receiving portions 46 and 47 were formed,
It may also be formed on the shift fork 40 for switching between two and four wheels. In this case, the second locking portion 44 of the regulating body 45 locks on the second sleeve and locks the second sleeve 41. It is configured to restrict movement only in the direction away from the spring 42.

(Effects of the invention) As described above, the transfer control device according to the invention includes a spring interposed between a shift fork for switching between two and four wheels and a sleeve interlocked with a control lever, and a spring on one end of the spring. a first locking portion that locks the spring; and a second locking portion that restricts only the movement of one of the shift fork or the sleeve located on the other end side of the spring in a direction away from the spring. a first locking portion for receiving the first locking portion of the regulating body on the other side of the shift fork or sleeve that is provided and located on one end side of the spring;
Since a receiving part and a second receiving part that receives the other end of the spring are provided, it is possible to switch between 2 and 4 wheels when shifting from the 2H position to the 4H position, or from the 4H position to the 2H position. When a locking phenomenon occurs in the shift fork, the shift fork is held in a standby state, and when the locking phenomenon is released, the elastic force of the spring is applied to the shift fork via the regulating body. , the shift fork can be moved, and therefore the elastic force of each spring interposed on both sides of the shift fork acts to cancel out the elastic force of the spring, as in the conventional case. This makes it possible to smoothly and reliably shift the shift fork using only one spring.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram of a control device according to the present invention, FIG. 2 is a partially omitted horizontal cross-sectional view of the control device, and FIGS. 3 to 6 are cross-sectional views of main parts. The figure shows the 2H shift state, FIG. 4 shows the 4H shift state, FIG. 5 shows the standby state when shifting from 2H to 4H, and FIG. 6 shows the standby state when shifting from 4H to 2H. 7 is a side view of the regulating body, and FIG. 8 is a front view of the regulating body. 4...Fork shaft, 40...Shift fork for switching between 2 and 4 wheels, 41...Sleeve, 42...
...Spring, 43...First locking part, 44...Second locking part, 45...Regulating body, 46...First receiving part, 47... Second receiving part.

Claims (1)

[Scope of utility model registration request] A shift fork for switching between 2-wheel drive and 4-wheel drive and a sleeve that is linked to a control lever are supported on a fork shaft so as to be freely movable in the axial direction, and the sleeve is moved by the operation of the control lever. , a transfer control device configured to switch to two-wheel drive or four-wheel drive via the shift fork, wherein a spring is interposed between the shift fork and the sleeve, and one end side of the spring is provided. a first locking portion that locks the spring; and a second locking portion that restricts only the movement of one of the shift fork or the sleeve located on the other end side of the spring in a direction away from the spring. and a first receiving part for receiving the first locking part of the regulating body and a second receiving part for receiving the other end of the spring, on the other side of the shift fork or sleeve located on one end side of the spring.
A transfer control device characterized by comprising a receiving part.