JPH063722U - Transfer device - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention aims to shorten the length of the rod receiving portion of the shift fork to reduce the size and weight of the transfer case, and to eliminate the position restriction for detecting the driving state. And According to the transfer device of the present invention, when the shift rod 13 is shifted from a four-wheel drive position to a two-wheel drive position, the bracket 10 is attached to the shift rod 10 while compressing a spring 12 arranged on the outer periphery of the shift rod 13. The shift rod 13 is moved in advance and the shift rod 13 is shifted by the elastic force of the compressed spring 12, and the coupling sleeve 8 is moved from the four-wheel drive position to the two wheels via the shift fork 14 fixed to the shift rod 13. It has a structure for shifting to the drive position.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a transfer device for a vehicle, and more particularly, to reduce the cost by smoothing the shift movement of the shift fork and shortening the length of the rod receiving portion of the shift fork to provide a compact and lightweight transfer case. The present invention relates to a transfer device which is capable of detecting a driving state (2WD, 4WD) without being restricted by a sensor position.

[0002]

[Prior art]

 Vehicles such as four-wheel drive vehicles are provided with transfer devices for distributing drive torque to the front and rear wheels.

FIG. 4 shows a cross-sectional structure of a conventional transfer device. This transfer device is roughly composed of a torque distribution mechanism section and a shift mechanism section.

The torque distribution mechanism section is for an input shaft 1 that inputs drive torque from a transmission (not shown), and a rear wheel that transmits the torque of the input shaft 1 to a rear wheel via a main shaft (drive shaft) 2. The output shaft 3, a drive gear 4 that is spline-fitted to the main shaft 2 to input the torque of the input shaft 1, a sprocket 6a that is non-couplingly provided on the outer periphery of the main shaft 2, and is formed at one end of the sprocket 6a. Driven gear 5, a coupling sleeve 8 that shifts to drive gear 4 and transmits the torque of drive gear 4 to driven gear 5, a front wheel output shaft 9 provided on the lower side of transfer case 20, and a front wheel. By the sprocket 6b connected to the output shaft 9 for use, the sprocket 6a, and the chain 7 hung on the sprocket 6b. It is configured.

The shift mechanism portion shifts the above-mentioned coupling sleeve 8 to a four-wheel drive position or a two-wheel drive position, and both ends thereof are fitted in the transfer case 20 and are axially moved while being shifted. A bracket 10 connecting the shift rod 13 and a shift lever (not shown), and a shift fork 14 fitted to the coupling sleeve 8 while being arranged to slide on the outer periphery of the shift rod 13 within a predetermined range. , A detection switch 16 for detecting the driving state and displaying "4WD" or "2WD" to the driver.

The shift fork 14 shifts the coupling sleeve 8 to the four-wheel drive position while following the shift movement of the shift rod 13 when the shift rod 13 shifts from the two-wheel drive position to the four-wheel drive position. When the rod 13 shifts from the four-wheel drive position to the two-wheel drive position, the coupling sleeve 8 and the driven gear 5, depending on the meshing state of the drive gear 4, delays the shift movement of the shift rod 13 and shifts the coupling sleeve 8 to the second position. It has a 2WD shift waiting mechanism that shifts to the wheel drive position.

The 2WD shift waiting mechanism is composed of a spring 12 housed in a hollow portion 14b of the rod receiving portion 11 and a stepped collar 14a that is urged by the spring 12 and abuts against an open end of the hollow portion 14b. When the shift rod 13 is shifted from the four-wheel drive position to the two-wheel drive position, the shift rod 13 precedes the shift fork 14 and shifts, whereby the spring 12 is compressed by the stepped collar 14a, and the coupling sleeve 8 and When the rotational torques of the driven gear 5 and the drive gear 4 change, the elastic force of the spring 12 shifts the coupling sleeve 8 to the two-wheel drive position.

The detection switch 16 comes into contact with the shift fork 14 when the shift fork 14 reaches the four-wheel drive position, and is turned ON / OFF by the contact or separation of the shift fork 14 and the position of the shift fork 14. Is detected, and thereby the drive state is detected.

In such a configuration, when driving torque is input from the input shaft 1, the torque is transmitted to the rear wheel output shaft 3 and the drive gear 4 spline-coupled to the main shaft 2.

At this time, when the driver shifts the shift lever from the two-wheel drive position to the four-wheel drive position to switch to the four-wheel drive, the shift rod 13 moves to the rear wheel output shaft 3 side via the bracket 10. The shift fork 14 shifts and the shift fork 14 shifts to the rear wheel output shaft 3 side by the contact between the pin 13a fixed to the shift rod 13 and the rod receiving portion 11 with this shift. When the shift fork 14 moves, the coupling sleeve 8 fitted to the shift fork 14 is shifted to the drive gear 4 while being synchronized with the drive gear 4 by a synchromesh mechanism (not shown), and the four-wheel drive state is set.

When the coupling sleeve 8 shifts to the drive gear 4, the drive gear 4 transmits torque to the driven gear 5, and thereby drives the sprocket 6 a. The torque transmitted to the sprocket 6a is transmitted to the front wheel output shaft 9 via the chain 7 and the sprocket 6b.

On the other hand, when the driver shifts the shift lever from the four-wheel drive position to the two-wheel drive position and switches to the two-wheel drive, the shift rod 13 shifts to the input shaft 1 side via the bracket 10, and Along with the movement, the stepped collar 14a compresses the spring 12 housed in the hollow portion 14b, and enters a shift waiting state. At this time, the load of the check spring 22 compressed by the bolt 23 acts on the shift rod 13 via the check ball 21 that comes into contact with the slope of the check groove 13b provided on the shift rod 13, so that the bracket 10, and The shift rod 13 is held by the spring 12 at the two-wheel drive position while resisting the force to restore the four-wheel drive position. Then, when the rotational torques of the coupling sleeve 8, the driven gear 5, and the drive gear 4 change, the coupling sleeve 8 is shifted to the two-wheel drive position by the elastic force of the spring 12 and becomes the two-wheel drive state. .

[0013]

However, according to the conventional transfer device, since the shift movement of the shift fork is performed by sliding the outer periphery of the shift rod, the shift fork is added to the shift fork in a shift waiting state. If the shift fork produces a twisting force due to the load, it will not slide smoothly. Therefore, the rod receiving portion of the shift fork becomes long in order to smoothly perform the shift movement of the shift fork. In addition, since the spring of the shift waiting mechanism is housed inside the rod receiving portion, a spring housing portion is added in addition to the sliding portion, which further disadvantageously lengthens the rod receiving portion. For this reason, it is inevitable that the transfer case becomes large and heavy, resulting in an increase in cost.

Further, since it is necessary to detect the drive state based on the position of the shift fork, there is a problem that the mounting position of the detection switch is restricted.

Therefore, an object of the present invention is to provide a transfer device capable of reducing the length of a rod receiver of a shift fork and reducing the size and weight of the transfer case.

Still another object of the present invention is to provide a transfer device capable of detecting a driving state without being restricted in position.

[0017]

[Means for Solving the Problems]

 In view of the above problems, the present invention smoothes the shift movement of the shift fork, shortens the length of the rod receiving portion of the shift fork, and eliminates the position restriction for detecting the driving state. The shift rod that moves in the axial direction while being supported by the shift rod, the bracket that moves in the axial direction based on the shift operation of the shift lever on the outer periphery of the shift rod, and the shift fork that is fitted to the coupling sleeve while being fixed to the shift rod. An elastic structure that constitutes the shift mechanism and is compressed around the shift rod by shifting the shift lever from the four-wheel drive position to the two-wheel drive position on the outer circumference of the shift rod by shifting the bracket prior to the shift rod. Install the body and shift the shift rod based on its elasticity to move the coupling sleeve. There is provided a trunk Sufa apparatus that is shifted from the wheel drive position to the two-wheel drive position.

[0018]

[Action]

 In the transfer device of the present invention based on the above configuration, since the shift fork and the shift rod are fixed, that is, the shift fork and the shift rod do not slide, the shift fork of the shift fork is generated even if a twisting force is generated on the shift fork. The shift movement can be made smooth. Therefore, the length of the rod receiving portion of the shift fork is only the length required for fixing the shift fork and the shift rod, and the length of the rod receiving portion can be shortened. Further, since the spring of the shift waiting mechanism is arranged not on the shift fork but on the outer circumference of the shift rod, the length of the rod receiving portion can be further shortened. Therefore, the transfer case can be made smaller and lighter, and the cost can be reduced. Further, since the driving state is detected by the shift movement of the shift rod, the degree of freedom of the mounting position of the detection switch is increased, and the detection switch can be mounted at any position.

[0019]

【Example】

 Hereinafter, the transfer device of the present invention will be described in detail with reference to the accompanying drawings.

1 to 3 show a transfer device according to an embodiment of the present invention, mainly a four-wheel drive state, a shift waiting state, and a two-wheel drive state of a shift mechanism portion thereof, respectively. . In these drawings, the same parts as those in FIG. 4 are designated by the same reference numerals and symbols, and detailed description thereof will be omitted.

The shift mechanism portion of this transfer device is connected to the shift rod 13 which is supported at both ends in the transfer case 20 and moves in the axial direction, and is connected to the shift lever. A movable bracket 10, a shift fork 14 fixed to the shift rod 13 and fitted to the coupling sleeve 8, and a detection for detecting the driving state and displaying "2WD" or "4WD" to the driver. It is composed of a switch 16.

The shift rod 13 is compressed by the stopper 10 c that abuts the bracket 10 on the outer periphery of the shift rod 13 and the bracket 10 moves in advance of the shift rod 13 when shifting from the four-wheel drive position to the two-wheel drive position. Further, a spring 12 for shifting the shift rod 13 by elastic force when the rotational torques of the coupling sleeve 8, the drive gear 4, and the driven gear 5 change, and an annular member 24 for locking the spring 12 are respectively provided. is doing.

The shift fork 14 has a structure in which the rod receiving portion 11 is directly fixed to the shift rod 13.

The detection switch 16 is provided on the bearing portion of the shift rod 13 of the transfer case 20, and is turned on and off by moving the shift rod 13 in the axial direction.

In the above configuration, when the driver shifts the shift lever to switch from the two-wheel drive state (FIG. 3) to the four-wheel drive, the bracket 10 moves to the rear wheel output shaft 3 side and the stopper 10c. The shift rod 13 that is in contact with the bracket 10 is shifted to the rear wheel output shaft 3 side. When the shift rod 13 moves, the shift fork 14 and the coupling sleeve 8 fitted thereto move to the four-wheel drive position. Since the coupling sleeve 8 and the driven gear 5 are synchronized with the drive gear 4 by the synchromesh mechanism (the details are omitted) having the intermediate cone 15, the coupling sleeve 8 is smoothly shifted to the drive gear 4. The four-wheel drive state (Fig. 1) is set.

On the other hand, when the driver shifts the shift lever to switch from the four-wheel drive state (FIG. 1) to the two-wheel drive, the bracket 10 moves to the input shaft 1 side. At this time, since the coupling sleeve 8 cannot shift due to the meshing resistance until the rotational torque between the coupling sleeve 8 and the drive gear 4, and the driven gear 5 changes, the shift rod 13 and the shift fork 14 are in the four-wheel drive state. And only the bracket 10 takes the lead in the two-wheel drive position. Therefore, the spring 12 is compressed by the bracket 10 and the shift waiting state (FIG. 2) is set. At this time, the load of the check spring 22 compressed by the bolt 23 acts on the bracket 10 via the check ball 21 that comes into contact with the slope of the check groove 10b provided on the bracket 10, so that the bracket 10 is spring-loaded. It is held in the two-wheel drive position while resisting the force to restore the four-wheel drive position by 12.

When the rotation torque between the coupling sleeve 8 and the drive gear 4, and the driven gear 5 changes, the extension force of the spring 12 compressed by the bracket 10 causes the shift rod 13 to shift to the input shaft 1 side. As a result, the coupling sleeve 8 fitted with the shift fork 14 is shifted to the two-wheel drive position and brought into the two-wheel drive state.

In the above transfer device, since the shift fork 14 and the shift rod 13 are fixed, that is, the shift fork 14 and the shift rod 13 do not slide, the shift fork 14 generates a prying force. Even so, the shift movement of the shift fork 14 can be made smooth. Therefore, the length of the rod receiving portion 11 of the shift fork 14 is only the length required for fixing the shift fork 14 and the shift rod 13, and the length of the rod receiving portion 11 can be shortened. Further, since the spring 12 of the shift waiting mechanism is not arranged in the shift fork 14 but is arranged between the bracket 10 and the shift rod 13, the length of the rod receiving portion 11 can be further shortened. Therefore, the transfer case 20 can be made smaller and lighter, and the cost can be reduced.

Further, since the driving state is detected by the shift movement of the shift rod 14, the degree of freedom of the mounting position of the detection switch 16 is increased, and the arbitrary position (in the embodiment, the bearing of the shift rod 14 is detected). Part) can be attached.

[0029]

[Effect of device]

 As described above, according to the transfer device of the present invention, both ends are supported by the transfer case and the shift rod moves in the axial direction, and the shift rod moves around the shift rod in the axial direction based on the shift operation of the shift lever. A shift mechanism is composed of a bracket and a shift fork that is fitted to the coupling sleeve while being fixed to the shift rod. When the shift lever is shifted from the four-wheel drive position to the two-wheel drive position on the outer periphery of the shift rod, The bracket is provided with an elastic body that is compressed by the shift movement prior to the shift rod, and the coupling sleeve is shifted from the four-wheel drive position to the two-wheel drive position by shifting the shift rod based on the elastic force. The shift fork can be moved smoothly because it is Together, can shorten the length of the rod receiving portion of the shift fork, it is possible to eliminate the constraint position to the detection of 且 single drive state.

[Brief description of drawings]

FIG. 1 shows a transfer device 4 according to an embodiment of the present invention.
Explanatory drawing which shows a wheel drive state.

FIG. 2 is an explanatory diagram showing a shift waiting state of the transfer device according to the embodiment of the present invention.

FIG. 3 shows a transfer device 2 according to an embodiment of the present invention.
Explanatory drawing which shows a wheel drive state.

FIG. 4 is a cross-sectional view showing a conventional transfer device.

[Explanation of reference numerals] 1 input shaft 2 main shaft 3 rear wheel output shaft 4 drive gear 5 driven gears 6a, 6b
Sprocket 7 Chain 8 Coupling sleeve 9 Front wheel output shaft 10 Brackets 10a, 10b Check groove 10c Stopper 11 Rod receiving part 12 Spring 13 Shift rod 13a Pin 13b, 13c Check groove 14 Shift fork 14a Step collar 14b Hollow part 15 Intermediate cone 16 Detection Switch 20 Transfer Case 21 Check Ball 22 Check Spring 23 Bolt 24 Annular Member

Claims (1)

[Scope of utility model registration request] 1. A transfer device having a shift mechanism section for shifting a coupling sleeve to switch between four-wheel drive and two-wheel drive, wherein the shift mechanism section is axially supported while being supported at both ends by a transfer case. A shift rod that is movable, a bracket that is connected to the shift lever and that moves in the axial direction on the outer periphery of the shift rod, and a shift fork that is fixed to the shift rod and that is fitted to the coupling sleeve. The rod has an elastic body on its outer circumference, which is compressed by the bracket moving in advance of the shift rod when the shift lever is shifted from the four-wheel drive position to the two-wheel drive position. The body shifts the shift rod based on its elastic force to move the coupling rod. A transfer device characterized by shifting the ring sleeve from a four-wheel drive position to a two-wheel drive position.