JPH01215625A - Driving force interrupter of four-wheel drive vehicle - Google Patents

Abstract

PURPOSE:To use a conventional driving shaft and reduce the number of parts by mounting an engaging part on each of a side gear and a driving member of a differential gear mechanism to intermittently engage the side gear with the driving shaft and moving the driving member with a moving mechanism. CONSTITUTION:A differential gear mechanism 1 is held turnably by a differential carrier 2 via a bearing 3 and a ring gear 4 is engaged with a drive pinion gear 5 to which torque of an internal combustion engine is transmitted. A pair of the side gears 10 and 11 contained by a differential case 6 are joined with the left and right wheel driving shafts 12 and 13, respectively. In such case an annular driving member 6 is joined with the left wheel driving shaft 13 and has gear 17 and 18 which are engaged with the driving member 16 and the other side gear 10. A moving mechanism 19 which moves the driving member 16 in the axial direction of the left wheel driving shaft 13 is mounted externally around the driving member 16.

Description

[Detailed Description of the Invention] [Objective of the Invention 1] (Industrial Application Field) This invention provides a four-wheel drive vehicle that can switch between two-wheel drive and four-wheel drive. Related to driving force intermittent device.

(Prior Art) In general, part-time four-wheel drive vehicles have a transition mode that allows you to select between two-wheel drive and four-wheel drive. - is equipped with. When two-wheel drive is performed by the transfer, the non-drive side driven power transmission system (referring to the power transmission system from the transfer to the driven wheels) is rotated by the driven wheels, which rotate as the vehicle travels. When the driven tilting horn transmission system is rotated in this manner, the running resistance of the vehicle increases, and vibrations, noise, etc. are also affected. Therefore, during two-wheel drive, a part of the driven side power transmission system is disconnected to make the driven side free, which causes the above-mentioned running resistance and vibration. ! ! Countermeasures are being considered to reduce noise as much as possible.

As an example of such a countermeasure, there is a vehicle equipped with a driving force disconnection device for a four-wheel drive vehicle as shown in FIG. 9 (see Japanese Patent Laid-Open No. 60-215428Q). This drive power intermittent device is used for front engine, front 1-drive (
J31.FF) based four-wheel drive vehicle. Differential gear 81M4 interposed between the propeller shaft and the rear wheel drive shaft
It is set in.

Reference numeral 101 denotes a differential gear mechanism that is rotatably supported by the differential carrier 100, and this differential gear mechanism includes a ring 1'' and a 103 that mesh with the drive pinion gear 102, and a differential case 104 in which the ring gear 103 is provided. and a pinion gear 106 that is rotatably attached to the differential case 104 via a shaft 105.
A pair of glued gears 1 meshing with this binion gear 106
It consists of 07.108.

The side gear 107 has a left shaft 109 and a side gear 108.
t, the right shaft 110 is spline connected, and the left shaft 1
09 and the right-hand shaft 110 are the left-hand wheel drive shaft (not shown) and the right-hand wheel drive shaft, respectively! It is connected to Fl@II (not shown). The right shaft 110 is divided into a first shaft 111 and a second shaft 112, and the connection between the first shaft 111 and the second shaft 112 is interrupted by a 111i connection mechanism 113. Intermittent mechanism 1
Reference numeral 13 denotes a coupling sleeve 114 spline-coupling the first shaft 111 and the second shaft 112, a notch 115 that rotates around this coupling sleeve 114, and a denomination 115 that rotates this coupling sleeve 114. -t. A push-pull cable 117 that moves via a moving shaft 116 supported by the rear 100 so as to be freely movable.

During two-wheel drive, the first shaft 111 is
The connection between the second shaft 112 and the second shaft 112 is disconnected. For this reason,
The right rear wheel only rotates the right wheel drive shaft and the second shaft 112, but does not rotate the first shaft 111. Also,
The rear wheel on the side 1 rotates the left wheel drive shaft J and the left shaft 109, but along with this rotation, the side 1 near 107.10
8 Vinyl A1 Near 106 and No. 1'1111111 are idled, differential case 104) Ring gear 1
03 etc. will not be rotated. In this way, the rotational resistance from the transfer to the differential case 10/I is reduced to improve fuel efficiency and wear, and secondly, the noise generated from this drive system is reduced.

(Problem to be Solved by the Invention) However, in such a conventional driving force disconnection device during four-wheel drive, the right shaft 110 spline-connected to the -nide 1 = a' 108 is connected to the first shaft 111. Second axis 112
1, and the divided first axis 111 and second axis 1
Since the connection with 12 was made l1iIfc, the conventional undivided right wheel drive shaft could no longer be used. Furthermore, since the first shaft 111 and the second shaft 112 are divided into υ1, the first shaft 111 and the second shaft 112 must be newly manufactured separately. Therefore, there are problems in that the driving force intermittent head of a four-wheel drive vehicle has a large number of parts as a whole, the assembly process is complicated, and the cost is also high. In addition, Def Kireria 10
Since a driving force intermittent device was provided at the 0, there was also the problem that the conventional deck 12 rear 100 could not be used.

[Structure of the Invention] (Means for Solving the Problems) In order to solve such problems, the present invention includes a side gear of a differential gear mechanism that is rotatably provided on a drive shaft, and A drive member that is provided on the drive shaft so as to be separable from the side gear and rotates integrally with the drive shaft, and an engagement between the side gear and the drive member to transmit the torque transmitted to the side gear to the drive member. The joint part and the movement for moving the drive member to engage or disconnect from the side gear! j+Ila structure, and the moving mechanism is arranged on the outer periphery of the differential case.

(Function) During two-wheel drive, the drive fJJ member is moved by the moving mechanism to be separated from the side gear, and the engagement between the drive member and the side gear is separated. When the drive member is disengaged from the numbered gear, the differential case of the differential F4 vehicle AM will not be rotated by the wheels that rotate.

Here, to disconnect the connection between the side gear and the drive shaft,
Side gear and Kakeru! Since an engaging portion is provided in each of the 71 members and the drive member is moved and engaged by the moving mechanism, the conventional drive shaft can be used as is. Further, since this driving force intermittent device can be housed in the differential carrier, the conventional differential carrier can be used as is.

(Example) Hereinafter, the present invention will be explained based on the drawings. 1 to 8 are diagrams showing an embodiment of a driving force disconnection device for a four-wheel drive vehicle according to the present invention.

First, the configuration will be explained.

This four-wheel drive vehicle driving force 1livc system 4 is provided in a differential gear machine IM1 interposed between a propeller shaft and a rear wheel drive shaft in an FF-based four-wheel drive vehicle.

The differential gear machine 41% 1 is rotatably supported by the differential carrier 2 via a bearing 3. The ring gear 4 of the differential gear device 1 meshes with a drive pinion gear 5 to which torque of the internal combustion engine is transmitted from a drive power transmission system. Further, the ring gear 4 is fixed to a 7-lung portion 6a of the differential case 6 with bolts 7. A pinion shaft 8 is attached to the differential case 6 by being fitted into a fitting fM 6 b formed in the differential case 6, and a pinion gear 9 is rotatably supported by the pinion shaft 8.

A pair of side gears 10 and 11 housed in the differential case 6 mesh with the binion gear 9, and the right side gear 11 is spline-connected to the right wheel drive shaft 12.
The left side gear 10 connects to the left wheel drive shaft 13 via a sleeve 14 spline-fitted to the left wheel drive shaft 13.
3 is rotatably supported. A driving force connection device 15 for a four-wheel drive vehicle is interposed between the side gear 10 and the left wheel drive shaft 13.

That is, the left wheel drive shaft 13 has an annular drive member 16.
are connected by splines. Further, the drive portion t416 is slidable in the axial direction of the left wheel drive shaft 13 (to the right in FIG. 1), and comes into contact with or separates from the side gear 10.

The drive member 16 and the side gear 10 are each provided with teeth 17, 18 as engaging portions on opposing surfaces. When the drive member 16 is activated and comes into contact with the side gear 10, the respective #17 and #18 are meshed and engaged), and the torque transmitted to the side gear 10 is transmitted to the left wheel drive shaft 13 via the drive member 16. Ru.

A moving mechanism 19 for moving the drive member 16 in the axial direction of the left wheel drive shaft 13 is provided on the outer peripheral side of the drive member 16 . The cylinder 20 disposed on the outer peripheral side of the differential case 6 includes a cylinder part 20a having a U-shaped cross section and an annular shape as a whole, and a piston t fitted in the cylinder part 20a so as to be rotatable. It consists of 20 b. The cylinder portion 20a and the piston 1W20m are connected by a rotation pin 21 so as not to rotate relative to each other, and seal portions 1122a and 22b are interposed between the cylinder portion 20a and the piston portion 20b.

A return spring 24 is compressed in the working chamber 23 defined by the cylinder FIS 20 a and the piston FJS 20 b, and an introduction pipe 25 for introducing negative pressure is opened in the working chamber 23. .

A holding mechanism section 26 is provided between the piston section 20b and the drive member 16. That is, as shown in FIG. 2, the first engaging member 27 that engages with the piston portion 20b includes an annular disk lA27a and a structure that projects from this disk portion 27 in the axial direction of the side wheel fitting initial shaft 13. It consists of a protruding portion 27b. The tip of the protruding portion 27b is wide, and the second engaging member 28 is engaged with the tip of the protruding PIS 27b.

As shown in FIG. 3, the second engaging portion 4128 includes a disc portion 28a having a flange and a pair of guide protrusions 28b128b. The guide protrusion 28b128b is fitted into the protrusion 27b as shown in FIG.
7 and the second engaging member 28 are relatively slidably engaged with each other.

The second retaining member 28 is fitted into a step formed on the drive member 16 and is fixed by a locking member 29. The second engaging member 28 is located between the second engaging member 28 and the differential case 6.
A shift spring 30 that urges the drive member 16 to come into contact with the side gear 10 via the shift spring 30 is provided.

As shown in FIGS. 5 and 6, the cylinder 20 is prevented from rotating by engaging a protrusion 20c of the cylinder 20 with a rotation prevention plate 32 fixed to the differential carrier 2 by a bolt 31.

Next, the effect will be explained.

In an FF-based four-wheel drive vehicle, when the transfer is operated to drive in front wheel drive (two-wheel drive), negative pressure is not supplied to the working chamber 23 of the cylinder 20. Working chamber 2
3 is not supplied with negative pressure, the piston portion 20b is pushed leftward in FIG. Similarly, it is pulled to the left. Therefore, the drive member 16 is in a state separated from the side gear 10, and the teeth 17 of the drive member 16 and 1f of the side gear 10 are separated from each other.
j18, and the engaged state is interrupted. Therefore, the left rear wheel rotating around rotates the left wheel drive shaft 13, but since the side gear 10 is rotatably provided via the sleeve 14, the left wheel drive shaft 13 only idles.

In addition, the right rear wheel rotates the right wheel drive shaft 12, and further rotates the side gear 11, the binion gear 9, and the side gear 10. However, the right wheel drive shaft 12, the binion gear 9, and the side gears 10 and 11 only idle, and the differential case 6 earring gear 4, etc. cannot be rotated.
S. As a result, the drive system from the differential case 6, ring gear 4, drive pinion gear 5 to the transfer is not driven in the opposite direction, reducing the rotational resistance of this drive system, and the flow into the differential gear rear 2. 1
It is possible to improve fuel efficiency and reduce wear without causing stirring resistance of Ivl oil. In addition, Jl! generated from the drive system! Sound can be reduced.

Next, when operating the transfer and driving in four-wheel drive, negative pressure is supplied to the cylinder 20.

When negative pressure is supplied to the cylinder 20, the piston 2011 moves to the right in FIG. 1 against the urging force of the return spring 24. The drive member 16 is a shift spring 30
It moves toward the side gear 10 due to the urging force of.

Here, the south 17.18 of the drive member 16 and the side gear 10
If the phases do not match, the waiting mechanism 26 operates as shown in FIG.
When the phases of the gears 18 match, the teeth 17 of the drive member 16 and the teeth 18 of the side gear 10 mesh with each other and become engaged, as shown in FIG. In this way, when the left wheel drive shaft 13 and the side gear 10 are connected, the torque of the internal combustion engine is transmitted from the drive system such as a transfer to the drive pinion gear 5, and is further transmitted to the ring gear 4, the differential case 6, the pinion gear 9, and the side gear. From 10.11, left wheel drive shaft 13
and is transmitted to the right wheel drive shaft 12, and the vehicle travels in four-wheel drive.

(In FIG. 8, the flow of torque is indicated by a thick line.) In this way, in order to disconnect and disconnect the side gear 10 and the left wheel drive shaft 13, @17.18 is applied to each of the side gear 10 and the drive section 016. and move the drive member 16.
Since the teeth 17 and 18 are moved by the J mechanism 19 and brought into mesh with each other, the conventional left wheel drive shaft 13 can be used as is. Therefore, this driving force 111M
The overall number of parts of the device is reduced, the assembly process is simplified, and costs can be further reduced.

Further, since the driving member 16 is provided on the left wheel drive shaft 13 so as to engage with the side gear 10, and the moving mechanism 19 for moving the driving member 16 is provided on the outer circumferential side of the differential case 6, this driving force intermittent device Since the differential tooth width mechanism, the driving force intermittent mechanism, and the moving mechanism can be constructed compactly as one unit, it can be housed in the differential carrier 2. Therefore, the conventional differential carrier 2 can be used as is, and the overall cost can be reduced.

[Effects of the Invention] As explained above, according to the present invention, in order to disconnect and disengage the engagement between the side gear and the drive shaft of the differential gear mechanism, an engaging portion is provided on each of the side gear and the drive member, Since the drive member is moved by the moving mechanism, a conventional drive shaft can be used as is. therefore,
This driving force disconnection device as a whole has fewer parts, and the assembly process is simplified, further reducing costs. Further, since this driving force intermittent device can be housed in the differential carrier, the conventional differential carrier can be used as is, and the overall cost can be reduced.

[Brief explanation of the drawing]

1 to 8 are views showing one embodiment of the driving force disconnection device for a four-wheel drive vehicle according to the present invention, and FIG. 2 is a perspective view showing the first engaging member, FIG. 3 is a perspective view showing the second engaging member, and FIG. 4 is a sectional view taken along the line ■-■ in FIG. 1. , FIG. 5 is a view in the direction of the V arrow in FIG. 1, FIG. 6 is a view in the direction of the Vl arrow at J3 in FIG. FIG. 3 is a sectional view illustrating a state in which the engaging portion of the driving force interrupting device is engaged. FIG. 9 is a sectional view showing intermittent driving force waves 6 of a conventional four-wheel drive vehicle. 1...Differential gear mechanism 10...Side gear 13...Drive shaft 14...Sleeve 16...Drive member 17.18...Engaging portion 19...Moving mechanism agent Patent attorney 3 Yoshiyasu Otoka 2nd grade 31st ■ Figure 5 1st floor 6th floor

Claims (1)

[Claims] A side gear of a differential gear mechanism is provided to be rotatable relative to the drive shaft, a drive member is provided to the drive shaft so that it can be moved into and out of the side gear and rotates integrally with the drive shaft, and a drive member that transmits the torque transmitted to the side gear. an engaging portion provided on the side gear and the driving member to transmit the information to the side gear, and a moving mechanism for moving the driving member to engage or disconnect from the side gear, the moving mechanism being disposed on the outer periphery of the differential case. A driving force intermittent device for four-wheel drive vehicles, which is characterized by: