JPS62155136A - Transfer device for automobile - Google Patents

Abstract

PURPOSE:To facilitate the switching operation into two wheel driving condition by constructing such that a differential locking means will perform the differential locking operation automatically while interlocking with the power disconnecting operation of a power connecting/disconnecting means. CONSTITUTION:When a differential lock lever 50 is rotated to a position shown by a solid line through the operation of an operating lever 48, an engaging member 51, a spring 52 and a differential lock fork 44 are interlocked and slid over a shaft 46. Consequently, a differential lock engaging chip 36 is disengaged from a drive side spline 30. Consequently, a center differential gear 19 is brought into a released condition. When the lever 50 is rotated as shown by an imaginary line through the operation of the operating lever 48, the center differential gear 19 is brought into a differential locked condition by the operation contrary to the case shown by the solid line. Consequently, when a power connecting/disconnecting means 29 is disconnected or when a transfer 18 is brought from four wheel drive condition into two wheel drive condition, a differential lock meand 34 or the center differential gear 19 can be locked automatically while being interlocked with a shift fork 33.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a transfer system for an automobile in which a center differential is automatically differential-locked by switching to two-wheel drive.

(Prior art) For automobile transfer, Japanese Patent Application Laid-Open No. 58-6
There is one as shown in Japanese Patent No. 3523.

With this configuration, even if there is a difference in the external force that the front and rear wheels receive from the road surface while driving with four-wheel drive, the engine and the rear wheels are connected in a 1i1 system so that the torque transmitted from the engine to the front and rear wheels is distributed in a predetermined manner. , a center differential is provided between the rear wheels.

Further, in order to enable switching between a two-wheel drive state and a four-wheel drive state, a power connection/disconnection means is interposed between the center differential and the rear wheels. In this case, when the power connection/disconnection means is operated to disconnect to create a two-wheel drive state in which only the front wheels are driven, and power is input from the engine to the center differential, the output section of the center differential to the rear wheels is in an idle state. If this is the case, the power from the engine will only idle the output section of the center differential toward the rear wheels, and in this state, the power from the engine cannot be transmitted to the front wheels. Therefore, the above two-wheel drive type! When it's calm,
A differential lock means is provided that locks both output parts of the center differential (so-called differential lock) to each other and rotates them together, thereby making it possible to transmit power to the front wheels. Therefore, in the configuration described in -, in order to obtain the two-wheel drive state, in addition to operating the power disconnection means, the differential lock L
Stage operations are required.

(Problems to be Solved by the Invention) By the way, in the conventional configuration as described above, the operation system for the power connection/disconnection-r single stage and the operation system for the differential lock means are provided separately, so that when the two-wheel drive state When switching to
It is required to operate these operating systems individually, and therefore, the switching operation to the two-wheel drive state is complicated.

([Objective 1] of the invention) This invention was made by paying attention to the above-mentioned 11 circumstances, and is designed to facilitate switching to a two-wheel drive state when an automobile has a center differential. The purpose is to

(Structure of the Invention) A feature of the present invention for achieving the above object is that the differential lock means is connected to the power disconnection unit so that the first stage differential lock operates in conjunction with the power disconnection operation of the power disconnection unit. It lies in the fact that it is linked to the means.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

In the figure, 1 is a car, 2 is an engine, 3 is a transmission, 4 is a front wheel, and 5 is a rear wheel. A carburetor 7 is connected to the intake side of the engine 2. Further, an arrow Fr in the figure indicates the front of the automobile 1.

Each of the front wheels 4 is supported by a front axle 13, and a bevel gear type front wheel differential bag g!
114 is interposed. On the other hand, each of the rear wheels 5 is also supported by a rear axle 15 in the same manner as described above, and a rear wheel differential device 16 is interposed between the left and right rear axles 15,15.

The engine 2 and front and rear wheel differentials 14 and 16 are connected via a transfer 18. This transfer 18 transmits the power of the engine 2 only to the rear wheels 5, or in addition to this, also transmits it to the front wheels 4.

The transfer 18 will be explained in more detail below.

This transfer 18 has a center differential 19.

This center differential 19 has the same structure as the front wheel differential device 14 and the rear wheel differential bag 116, and the differential case 20
It has a differential binion 21 rotatably supported by the differential case 20, and a pair of differential side gears 22 and 22' that mesh with the differential binion 21. The differential case 20 is driven by the engine 2, and one differential side gear 22, which is the output side of the center differential 19, is connected to the front wheel differential device 1 via a chain transmission means 24.
4, and the other differential side gear 22' is operatively connected to the rear wheel differential 16.

The chain transmission means 24 is connected to the differential side gear 22'.
A driving chain wheel 25 that is freely rotatable on the same axis as the front wheel, a driven chain wheel 26 that is interlocked and connected to the front wheel differential 14, and a transmission that is wound around the driving chain wheel 25 and the driven chain wheel 26. It is composed of a chain 27.

A power connection/disconnection means 29 is provided between the center differential 19 and the front wheels 4 to connect/disconnect power transmission. That is, the drive side spline 30 is formed on one of the differential side gears 22, and the drive side spline 30 is formed on the drive chain wheel 25.
A driven side spline 31 having the same diameter and the same shape is formed.

Further, the drive side spline 30 includes a power disconnection engager 3.
2 is fitted onto the outside so as to be slidable only in the axial direction, and this power connecting/disconnecting engager 32 can be freely engaged with and disengaged from the driven side spline 31 by sliding.

Then, as shown by the solid line in the figure, when the power connecting/disconnecting engager 32 is slid to engage the driven side spline 31 and the one differential side gear 22 is connected to the drive m iff 25, the power of the engine 2 is reduced. It is transmitted to the front wheel 4 side in addition to the rear wheel 5 side. That is, a four-wheel drive state is thereby obtained.

Further, as shown by the imaginary line in the figure, when the power connection/disconnection engager 32 is slid to release the engagement with the driven side spline 31 and the power transmission from the differential side gear 22 to the drive chain east 25 is cut off, The power of the engine 2 is transmitted only to the rear wheels 5 side. That is, as a result, a two-wheel drive state of only the rear wheels 5 is obtained.

By the way, in the case of two-legged gear, if one differential side gear 22 remains in an idle state, the center differential 19
Even if power is received from
2 only idles, and this power is not transmitted to the rear wheels 5. Therefore, when the two-wheel drive state is set, the differential lock means 34 that differentially locks the center differential 19 is used.
will be provided. That is, a differential lock spline 35 is formed on the differential case 20. This differential lock spline 35 has the same diameter and the same shape as the drive side spline 30. Further, a differential lock retainer 36 is fitted onto the differential lock spline 35 so as to be able to swing freely only in the axial direction.
This differential lock engager 36 can be freely engaged and detached from the drive side spline 30 by sliding, and when engaged, the center differential 1
9 is differential locked.

Note that in the four-wheel drive state, when the differential lock engager 36 is slid to release the engagement with the drive side spline 30 as shown by the solid line in the figure, the differential lock of the center differential 19 is released, and the center differential 19 functions as a differential device. In addition, when the differential lock engager 36 is slid to engage the drive side spline 30 and the center differential 19 is placed in the differential lock state in the four-wheel drive state, the front wheels 4 and rear wheels 5 respond to the load received from the road surface. Torque is transmitted from the engine 2 to these front and rear wheels 4.5, respectively.

Next, the operating system of the power connection/disconnection engager 32 will be explained.
The shift fork 33 is supported by the transfer case 18a so as to be movable parallel to the axis of the power connection/disconnection engager 32. A shift lever 37 is connected to one end of the shift fork 33, and a diaphragm actuator 38 is provided for applying rotational force to the shift lever 37. In addition, the vaporizer 7
A first on-off valve 39 and a second on-off valve 40 of three boats and two positions are provided, which actuate the actuator 38 based on the differential pressure between the downstream side of the pump and the surge tank 11 .

In the actuator 38, one chamber 38a partitioned off by a diaphragm is connected via a first on-off valve 39 to the downstream side of the vaporizer 7, which is a low pressure source. In this first on-off valve 39, a third boat other than the boat connected to the one chamber 38a and the downstream side of the carburetor 7 is communicated with the atmosphere.

Further, the other chamber 38b of the actuator 38 is located in the second chamber 38b.
It is communicated with the atmosphere via an on-off valve 40.

This second on-off valve 40 has the same configuration as the first on-off valve 39,
The third port is connected to the downstream side of the vaporizer 7.

In addition, each solenoid of the first on-off valve 39 and the second on-off valve 40 is connected to a power source 4 via a two-wheel/four-wheel drive changeover switch 41.
Connected to 2. 43 is a check valve.

Then, as shown by the solid line in the figure, the changeover switch 41
When switching to the four-wheel drive side (4WD), the first on-off valve 3
The solenoids of the second on-off valve 9 and the second on-off valve 40 are both excited (turned on), and one chamber 38a of the actuator 38 is depressurized by the pressure on the downstream side of the carburetor 7 via the first on-off valve 39. On the other hand, the other chamber 38b is communicated with the atmosphere via the second on-off valve 40, and the actuator 38 is actuated by the pressure difference between them. Then, the shift lever is connected to this actuator 38.
37 and shift fork 33 are sequentially interlocked, and the power connecting/disconnecting engager 32 engages with the driven side spline 31. This brings the vehicle into the four-wheel drive state.

In addition, as shown by the imaginary line in Figure 1, the changeover switch 41
When switching to the two-wheel drive side (2WD), the first on-off valve 3
9 and the second on-off valve 40 are both demagnetized (turned off), and the actuator 38 is operated in the opposite manner to the above. Then this act. Shift lever 37 to eta 38
and the shift fork 33 are sequentially interlocked, and the power engagement/disconnection engager 32 is disengaged from the driven side spline 31, thereby resulting in the two-wheel drive state.

Next, the operation system of the differential lock retainer 36 will be explained. A differential lock fork 44 is engaged with the differential lock engager 36. This differential lock fork 44
is axially slidably supported by a support shaft 46 supported by the transfer case 18a, and this support shaft 46 has an axis parallel to the axis of the differential lock engager 36.

On the other hand, the differential lock lever 5 is linked to the operating lever 48 for differential lock operation via a push-pull cable 49.
0 is set. Further, an engaging body 51 is provided which engages with the cut end on one end side of the differential lock lever 50, and this engaging body 51 is slidable in the axial direction on the support shaft 46.
,ing.

A spring 52 is interposed between the differential lock fork 44 and the engaging body 51 to urge them apart. Further, a regulation plate 53 is provided that forces the differential lock fork 44 and the engaging body 51 to separate by a predetermined amount or more, and this regulation plate 53 is also supported by the support shaft 46 so as to be slidable in the axial direction.

Then, by operating 8-48, rotate the differential lock lever 50 as shown by the solid line in the figure.

The engaging body 51, the spring 52, and the differential lock fork 44 slide on the support shaft 46 in conjunction with each other, thereby disengaging the differential lock engaging element 36 from the drive side spline 30. Therefore, the center differential 19 enters the differential lock release state.

In addition, if the differential lock lever 50 is rotated as shown by the imaginary line in the figure by operating the operating lever 48, the engaging body 51,
The regulation plate 53 and the differential lock fork 44 slide on the support shaft 46 in conjunction with each other, thereby causing the differential lock engager 36 to engage with the drive side spline 30. Therefore, the center differential 19 is differentially locked.

In the two-legged configuration, when the power disconnection means 29 is disconnected, that is, when the transfer 18 is changed from a four-wheel drive state to a two-wheel drive state, the differential lock means 34 is operated in conjunction with the shift fork 33 to lock the center differential. 19 is set to differential lock.

That is, the shift fork 33 is provided with an engagement piece 55 that engages with the other rotating end of the differential lock lever 50. This retaining piece 55 is connected to the power connecting/disconnecting means 29 of the shift fork 33.
Only when the differential lock lever 50 is slid to perform a cutting operation, the differential lock lever 50 is engaged with the other rotating end of the differential lock lever 50, and the differential lock lever 50 is rotated as shown by the imaginary line in the figure. Then, as described above, the engaging body 51. Regulation plate 5
3 and the differential lock fork 44 interlock, and the differential lock engager 36 engages with the drive side spline 30, whereby the center differential 19 is automatically differentially locked.

Although the above is based on the illustrated example, the power connection/disconnection means 29 may be interposed between the rear wheel 5 and the center differential 19.

(Effect of the invention) The effects of this invention are as follows.

That is, if the vehicle has a center differential, it is necessary to perform a differential lock operation on the center differential when switching to a two-wheel drive state. By the way, in this invention, the power disconnection means interposed between either the center differential and the front wheels or the center differential and the rear wheels has a disconnection operation, that is, a switching operation to the two-wheel drive state. Since the differential lock means is linked to the differential lock fm, the center differential is automatically differential locked when switching to the two-wheel drive state. Therefore, since the differential lock operation of the center differential is not required, the switching operation to the two-wheel drive mode 71 can be facilitated.

[Brief explanation of drawings]

The figure is an overall route map showing an embodiment of the present invention. 2-φ engine, 40. Front wheel, 50. Rear wheel, 18-・Transfer, 19・Fist center differential, 22.22'・
・Differential side gear (output side), 29...Power connection/disconnection means,
34... Defrotter means.

Claims (1)

[Claims] 1. Provide a center differential that inputs the power of the engine, one output side of which is interlocked with the front wheels, and the other output side of which is interlocked with the rear wheels, and between this center differential and the front wheels, and between the same center differential and the rear wheels. In the transfer of an automobile, the differential locking means is provided with a power disconnecting means interposed in either one of the above, and a differential locking means for enabling the center differential to be differentially locked, wherein the differential locking means is interlocked with the power disconnecting operation of the power connecting/disconnecting means. A transfer for an automobile, characterized in that the differential lock means is operatively connected to the power disconnection/disconnection means.