JPH1199843A - Rotation transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the weight of an other ring to constitute a two-way clutch, and reduce the cost. SOLUTION: A rotation transmission device 21 is built in a transfer to switch the 2WD from the 4WD. An outer ring 25 of a two-way clutch 32 is of a composite structure of inner and outer layers, and the inner layer 2b is formed of a hard metal, and the outer layer 2a is formed of a light metal such as aluminum. The outer ring 25 can be reduced in weight, and the material cost can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation transmission device used for switching between transmission and interruption of a driving force on a driving path of a vehicle.

[0002]

2. Description of the Related Art When a 4WD vehicle having directly connected front and rear wheels turns on a paved road, a so-called tight corner braking phenomenon occurs. As a means for solving this problem, the present applicant has filed Japanese Patent Application No. 8-172598. And Japanese Patent Application No. 9-28001
Proposed a rotation transmission device using a roller type two-way clutch and an electromagnetic coil.

As shown in FIG. 6 and FIG. 7, this rotation transmission device is an output from a transmission 4 connected to an engine 3 in an FR-based 4WD vehicle in which a hub clutch 2 is mounted at each end of a front wheel 1. Is transmitted directly to the propulsion shaft 8 of the rear wheel 7 via the input shaft 6 inside the transfer 5,
Inside the transfer 5, a roller engagement type two-way clutch 10 for transmitting and blocking rotation between the input shaft 6 and a chain sprocket 9 coaxially and rotatably mounted on the input shaft 6, and the two-way clutch 10 An electromagnetic clutch 11 for controlling locking and freeing is provided, so that in addition to the conventional typical part-time 4WD driving mode (2WD, 4WD-Hi, 4WD-Lo),
A 4WD control mode has been added.

According to this rotation transmitting device, if the 4WD control mode is selected, the vehicle is normally in a rear-wheel drive (2WD) state while the vehicle is running at a constant speed. A current flows through the clutch 11, and the two-way clutch 10 is locked to 4WD.

Also, when a sudden engine brake is applied on a low μ road or the like, the slip of the rear wheel is sensed, and a current is supplied to the electromagnetic clutch 11 to control to 4WD.

Further, if this device is used, as shown in FIG. 6, 2WD mode, 4WDLOCK mode, 4WD A
The driving mode of the vehicle such as the UTO (control) mode can be selected by the driver.

By the way, the above-mentioned rotation transmitting device is
By switching from 2WD to 4WD, the roller 10a
When the outer ring 10b engages with the inner member 10c, a large load is applied outwardly to the outer ring 10b, so that the outer ring 10b is required to have a large strength. It was made into a structure.

[0008]

However, the outer ring 1
0b is required to increase the thickness of the clutch portion, so the hard metal integrated structure increases the weight and
There is a problem that the material cost is high.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rotation transmitting device capable of reducing the weight and material cost while securing the strength of the outer ring.

[0010]

In order to solve the above-mentioned problems, a first aspect of the present invention is to provide a plurality of cam surfaces on one of an inner member and an outer ring and a cylindrical surface on the other, and a wedge between both surfaces. A space is formed, a retainer is provided in the wedge space, an engaging element is incorporated in a plurality of pockets formed in the retainer, and the retainer is supported at a neutral position where the engaging element does not engage with the cam surface and the cylindrical surface. A two-way clutch formed by locking an elastic member between the retainer and an inner member or an outer ring having a cam surface, and transmitting and blocking rotation of an input shaft and an output shaft for front wheel propulsion,
In a rotation transmission device for switching between 2WD and 4WD, comprising an electromagnetic clutch for controlling lock and free of the two-way clutch, the outer ring has a composite structure of inner and outer two layers that cannot rotate relative to each other, and the inner side is made of hard metal, This adopts a configuration in which the outside is made of light metal.

According to a second aspect of the present invention, in the first aspect of the present invention, a configuration is employed in which a rotation transmitting device is incorporated and used in a transfer.

[0012]

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

In the first embodiment shown in FIGS. 1 and 2, FIG. 1 is a sectional view of a transfer incorporating a rotation transmitting device 21 of the present invention, and FIG. 2 shows details of the rotation transmitting device.

As shown in FIGS. 1 and 2, the output from the transmission connected to the engine is transmitted to the rear propeller shaft via the input shaft 6 of the transfer 5, and as shown in FIG. The power can be branched to the propeller shaft 16.

The transfer 5 has an input shaft 6 coupled to an output shaft of the transmission 4 via a high / low select gear 13, which is a known technique, and which has a planetary gear set 14 and a select gear. When the vehicle passes through the high gear, the rotational torque is transmitted in a one-to-one relationship. When the vehicle passes through the low gear, the rotation is reduced and the torque increases.

A front output shaft 17 connected to the input shaft 6 and a front propeller shaft 16
The chain sprockets 18 and 19 mounted on the respective shafts 6 and 17 are linked by a silent chain 20 to split the power to the front wheel 1. The sprocket 18 for the input shaft 6 And is coupled to the input shaft 6 via a rotation transmission device 21.

In the rotation transmitting device 21, a cam ring 22 serving as an inner member is coaxially and non-rotatably fitted to a portion of the input shaft 6 communicating with the rear propeller shaft so as to be non-rotatable by serrations 26a. The cylindrical portion of the housing 24 externally fitted so as to be rotatable becomes an outer ring 25 externally fitted to the cam ring 22, and the housing 24 is connected to the chain sprocket 18 and the serration 26 so as to rotate integrally.

As shown in FIG. 2B, a plurality of cam surfaces 27 are provided on the outer periphery of the cam ring 22, and the inner diameter of the outer ring 25 is a cylindrical surface 28. A wedge-shaped space is formed between each cam surface 27 and the cylindrical surface 28. In addition, a retainer 29 that fits over the cam ring 22 is provided in the wedge-shaped space, and a roller 31 as an engaging element is incorporated in a pocket 30 formed at a position corresponding to each cam surface 27 of the retainer 29. Thus, a two-way clutch 32 is formed.

As shown in FIG. 2B, when the roller 31 is located at a center neutral position with respect to the cam surface 27, a gap is formed between the roller 31 and the cylindrical surface 28, and the rotation of the cam ring 22 is transmitted to the outer ring 25. When the roller 31 is biased to one side of the wedge space by the retainer 29, the roller 31 bites between the cam surface 27 and the cylindrical surface 28, and the roller 31 is turned on to transmit the rotation of the cam ring 22 to the outer ring 25. become.

The other end of the switch spring 33 whose one end is locked to the retainer 29 is locked to the cam ring 22, and the roller 31 is moved to a neutral position where the roller 31 is not engaged with the cam surface 27 and the cylindrical surface 28. 29 is biased.

An electromagnetic clutch 34 for controlling ON / OFF of the two-way clutch 32 is provided at one side of the two-way clutch 32 between the input shaft 21 and the outer ring 25.

The electromagnetic clutch 34 non-rotatably fixes the electromagnetic coil 37 to the transfer case with bolts or the like, and the electrode of the coil 37 is connected to an external controller (ECU) 40 through the transfer case. This ECU 40
Calculates and determines the signals input from the rotation speeds of the front wheel 1 and the rear wheel 7, the mode selection switch 41, the ABS operation, and the like, as shown in FIG. As shown in FIG. 6, the rotation speed of the front wheel 1 is detected by a front speed sensor 43, and the rotation speed of the rear wheel 7 is detected by a rear speed sensor 44.

The rotor 45, which is externally fitted to the electromagnetic coil 37 so as to be rotatable, is fixed to the outer race 25 and forms a friction flange so as to rotate integrally therewith.
And an arm 46 fitted to the retainer 29 so as to be slidable in the axial direction and non-rotatable relative to the retainer 29 so as to overlap with the rotor 45 via an appropriate gap,
When the electromagnetic coil 37 is energized, the rotor 45 and the armature 46 are pressed against each other by magnetic force, and the outer race 25 and the retainer 29 are fixed in the rotation direction.

In the rotation transmitting device 21, the outer ring 2
Reference numeral 5 denotes a composite structure of two inner and outer layers which are relatively unrotatable.

More specifically, an outer layer 25a made of a light metal such as aluminum forms the entire length of the housing 24, and an inner layer 25b inserted into the inner periphery of a part of the outer layer 25a constituting the two-way clutch 32 is made of iron or the like. The inner layer 25b is formed in a cylindrical shape using a hard metal, and the inner peripheral surface of the inner layer 25b becomes the cylindrical surface 28 of the two-way clutch 32, and the inner layer 25b and the outer layer 25 are formed.
a is connected in a detent shape by a serration 25c.

In the second embodiment of the rotation transmitting device shown in FIG. 3, a cam surface 27 is provided on the outer race 25 side in the two-way clutch 32, and the outer periphery of the inner member 22a is
The two-way clutch 32 of the outer race 25
The inner layer 25b made of hard metal is formed into a polygonal cylindrical shape, and a cam surface 27 is formed on the inner side.
Is formed, and the inner diameter of the outer layer 25a is set to be a polygon in which the inner layer 25b is accommodated, so that a detent state can be obtained.

In the third embodiment shown in FIG. 4, the rotation transmitting device 21 is mounted on the front output shaft 17 and the rotation transmitting device 21 is immersed in the lubricating oil in the transfer 5 to improve lubricity. This is an example of improvement.

In the third embodiment, an output sprocket 18 is provided integrally with the input shaft 6 of the transfer 5, and the input sprocket 19 and the shaft are rotatably mounted on the front output shaft 17. The connection and release of 17 are performed by the same rotation transmitting device 21 as in the first or second embodiment.

The fourth embodiment shown in FIG. 5 is a unitized rotation transmission device 21. The rotation transmission device 21 has the same structure as that of the first embodiment except that the input shaft 6 is made shorter and both ends thereof can be connected to the shaft. It has the same configuration as the first or second embodiment.

As described above, when the rotation transmitting device 21 is unitized, the degree of freedom of the installation position with respect to the vehicle is improved. For example, as shown in FIG.
And a front wheel axle 52 are mounted on a front propeller shaft 54 connecting the front axle 52 via a front differential 53, and 2WD and 4W
D can be switched.

The rotation transmitting device of the present invention has the above-described structure. The outer ring 25 has two inner and outer layers, the inner layer 25b is formed of hard metal, and the outer layer 25a is light metal. At the time, outer ring 25
The strength of the portion to which a load is applied can be secured by the inner layer 25b, and the outer layer 25a constituting the majority of the outer ring 25 is made of light metal, so that the weight of the entire outer ring 25 can be reduced and the material cost can be reduced.

[0032]

As described above, according to the present invention, the outer ring has a composite structure of inner and outer layers, and the inner side is made of a hard metal and the outer side is made of light metal. Can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a transfer incorporating a rotation transmitting device according to a first embodiment of the present invention;

FIG. 2A is a cross-sectional view of the rotation transmission device according to the first embodiment, and FIG. 2B is a vertical cross-sectional view of the same.

3A is a cross-sectional view illustrating a second embodiment of the rotation transmitting device, and FIG. 3B is a vertical cross-sectional side view taken along arrow bb in FIG.

FIG. 4 is a cross-sectional view of a transfer according to a third embodiment.

FIG. 5A is a cross-sectional view of a unitized rotation transmission device according to a fourth embodiment, and FIG.
Plan view showing layout of D-drive vehicle

FIG. 6 is a plan view showing a layout of a 4WD drive vehicle incorporating a rotation transmission device.

FIG. 7 is a cross-sectional view showing a transfer incorporating a conventional rotation transmission side view.

[Explanation of symbols]

 Reference Signs List 1 front wheel 2 hub clutch 5 transfer 6 input shaft 17 front output shaft 21 rotation transmitting device 22 cam ring 25 outer wheel 25a outer layer 25b inner layer 27 cam surface 28 cylindrical surface 29 retainer 32 two-way clutch

Claims (2)

[Claims] 1. A plurality of cam surfaces are provided on one of an inner member and an outer ring, and a cylindrical surface is provided on the other, a wedge space is formed between both surfaces, a cage is provided in the wedge space, and the cage is formed. An engaging element is incorporated in the plurality of pockets, and an elastic member that supports and biases the retainer to a neutral position where the engaging element does not engage the cam surface and the cylindrical surface is provided between the retainer and the inner member or the outer ring having the cam surface. And a two-way clutch for transmitting and blocking the rotation of the input shaft and the output shaft for front wheel propulsion, and an electromagnetic clutch for controlling locking and freeing of the two-way clutch, and switches between 2WD and 4WD. Transmission device for a vehicle, wherein an outer ring has a composite structure of inner and outer layers that cannot rotate relative to each other, and a hard metal is formed on an inner side and a light metal is formed on an outer side. 2. The rotation transmitting device according to claim 1, wherein the rotation transmitting device is incorporated in a transfer.