JP3354235B2 - Two-way differential clutch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-way differential clutch for engaging a sprag by relative rotation of an input gear and a rotating shaft in two directions.

[0002]

2. Description of the Related Art Conventionally, as a device for transmitting power to an automobile, a two-way differential clutch is incorporated in a power transmission path of the automobile, and torque transmission between an engine and wheels is switched by the two-way differential clutch. Has been proposed.

[0003] As shown in FIG.
The input gear 1 is rotatably fitted to the input shaft 1 via bearings 6 and 7, and a plurality of circumferential surfaces 3 and 4 provided on each of the opposing surfaces of the input gear 1 and the rotary shaft 2 at a predetermined interval. A sprag 5 is incorporated.

An outer retainer 8 is fixed to the cylindrical surface 3 of the input gear 1 via a pin 10, and an inner retainer 9 is rotatably supported on the outer periphery of the rotating shaft 2. A plurality of pockets 11, 12 into which the sprags 5 are inserted are formed facing the peripheral surfaces of the containers 8, 9.

[0005] In the pocket 12 of the inner retainer 9,
A spring member 31 as shown in FIG. 5 is attached, and the spring member 31 comes into contact with the side surface of the sprag 5 to apply a moment in a direction for holding the sprag 5 in a neutral state.

Further, the inner retainer 9 is pressed against a sub gear 14 by a disc spring 13, and the sub gear 14 and the input gear 1 mesh with, for example, a gear (not shown) on the engine side. Is input to the sub gear 14.

Here, the number of teeth of the sub-gear 14 is set to be greater than the number of teeth of the input gear 1. Slightly late. For this reason, the inner cage 9 pressed against the sub gear 14 causes a speed difference with respect to the rotation of the input gear 1, and the pin 1 of the inner cage 9
The sprags 5 are tilted by the spring force of the spring member 31 attached to the inner retainer 9 so that the clutch can be loaded with torque.

In the above-mentioned torque loadable state, if the rotation of the rotating shaft 2 is faster than the input gear 1, the sprags 5 stand and the rotating shaft 2 idles, and conversely, the rotation of the rotating shaft 2 is slow. If the input gear 1 rotates faster,
The sprags 5 are further tilted to connect the cylindrical surfaces 3 and 4 of the input gear 1 and the rotating shaft 2, and the rotation of the input gear 1 is transmitted to the rotating shaft 2. The rotation of the rotating shaft 2 is transmitted to the wheels via an output gear 15 which is spline-fitted to the outer periphery.

As described above, the two-way differential clutch described above
There is a function of transmitting the torque of the input gear 1 to the rotation shaft 2 only when the rotation of the input gear 1 becomes faster than the rotation shaft 2 irrespective of the rotation direction of the forward / reverse rotation.

[0010]

In the above-described conventional two-way differential clutch, the spring member 31 for controlling the tilting posture of the sprag 5 is divided for each pocket 12 as shown in FIGS. The claw portions 32 and the locking portions 33 provided on both sides of the spring member 31 are inserted into each pocket 12, and the locking portions 33 are hooked on the outer peripheral surface of the inner retainer 9. It is designed to be assembled.

However, in the spring member 31 having the above structure, the spring member 31 is incorporated into each pocket 12 during the assembling operation, and the locking portions 33 are securely hooked one by one onto the outer diameter surface of the inner retainer 9. Since it is necessary, there is a problem that the number of assembling steps is increased.

On the other hand, for example, Japanese Patent Application No. Hei 4-22221
In No. 23, as shown in FIGS. 7 and 8, a spring member is formed by a continuous band-shaped spring 41, and the band-shaped spring 41 is wound around the outer diameter surface of the inner retainer 9, and is integrally formed with the band-shaped spring 41. There is one in which the formed claw portion 42 is brought into contact with the side surface of the sprag. However, the above band-shaped spring 41
In the assembled state, the outer retainer 8 is sandwiched between the inner retainer 9 and the outer retainer 8, so that the contact between the inner retainer 9 and the outer retainer 8 may cause abrasion of the contact surface due to the contact with the outer retainer 8 which rotates relatively. There are points to be solved in terms of gender.

Therefore, the present invention solves the above-mentioned problem,
It is an object of the present invention to provide a two-way differential clutch in which a spring member can be incorporated into an inner retainer by a simple operation, and which is free from wear due to contact with the outer retainer during use.

[0014]

In order to solve the above-mentioned problems, the present invention forms a coaxial cylindrical surface on each of opposing surfaces of an input gear and a rotating shaft which are fitted to each other, and forms a coaxial cylindrical surface between the two cylindrical surfaces. An outer cage fixed to the input gear and an inner cage rotatably supported are provided, and the input gear and the rotating shaft are provided in a plurality of pockets provided opposite to the inner and outer cages. A sprag that engages between the two cylindrical surfaces by relative rotation in two directions is incorporated, and a plurality of sprag insertion holes corresponding to the respective pockets are provided in a band-shaped spring wound around the inner peripheral surface of the inner retainer. On the side of the sprag insertion hole, an elastic claw is formed to contact the side surface of the sprag and hold the sprag in a neutral state, and a contact portion that elastically contacts the end surface of the pocket in the inner cage with the band-shaped spring. Established, The elastic contact parts and the pocket end face
Adhesion of the inner peripheral surface of the inner cage by expanded more strip spring
That is , the configuration was adopted .

[0015]

In the above construction, the band spring is wound around the inner peripheral surface of the inner cage, and the contact portion of the end of the band spring is brought into contact with the end surface of the pocket of the inner cage. Closely fix to the inner peripheral surface of the inner cage.

In this structure, since the band spring comes into close contact with the inner diameter side of the inner cage and does not contact the outer cage, the belt spring does not wear due to the contact.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Since the basic structure and operation of the two-way differential clutch have been described above, the same parts will be denoted by the same reference numerals and description thereof will be omitted, and only the features of the embodiment will be described.

As shown in FIGS. 2 and 3, in this embodiment, one continuous band-shaped spring 21 is
, And the attitude of the sprag 5 is controlled by the band-shaped spring 21.

The band-shaped spring 21 has a plurality of sprag insertion holes 22 corresponding to each pocket 12 of the inner retainer 9 formed on the peripheral surface at predetermined intervals in the length direction. Elastic claw pieces 23 and 24 are integrally formed on opposite sides of the elastic claw pieces.

Each of the elastic claw pieces 23 and 24 rises with a slight inclination toward the inner diameter side. As shown in FIG. It is formed to enter inside. The elastic claw pieces 23 and 24 that have entered the pocket 12 abut against both side surfaces of the sprags 5 housed inside the pocket 12 and apply a predetermined moment force to the sprags 5 by the spring force to erect the sprags 5. It is set to keep in the state.

The sprag insertion holes 22a and 22b at both ends of the band spring 21 overlap with each other in a state where the band spring 21 is attached to the inner peripheral surface of the inner retainer 9 as shown in FIG.
It can be wound in conformity with the inner diameter side of an arbitrary pocket 12.

The sprag insertion holes 22a, 23 at both ends are provided.
On one side, elastic claw pieces 23 and 24 are formed on one side to be in contact with the respective sides of the sprag 5, and on the other side, the end faces 16, 17 of the pocket 12 of the inner retainer 9 in the assembled state. Abutment portions 25 and 26 are formed to abut the contact portions.

The contact portions 25 and 26 rise so as to face in parallel with the end surfaces 16 and 17 of the pocket 12, and each contact portion is wound with the band-shaped spring 21 wound around the inner retainer 9 as shown in FIG. The portions 25, 25 are configured to elastically abut against the respective end surfaces 16, 17 of the pocket 12 and generate a tension in the direction of expanding the diameter of the entire band-shaped spring 21 by the abutment.

This embodiment has the above-described structure. When a sprag is incorporated in a retainer, a continuous band-shaped spring 21 is wound around the inner peripheral surface of the inner retainer 9 to form a band-shaped spring.
When the contact portions 25 and 26 are brought into contact with the end surfaces 16 and 17 of the pocket 12, the tension generated by the contact causes the band spring 21 to be in close contact with the inner peripheral surface of the inner retainer 9 and fixed. For this reason, the band-shaped spring 21 can be easily fixed to the inner retainer 9 in one step, and it is not necessary to separately install a spring member for each pocket unlike the conventional structure shown in FIG.

Further, since the band-shaped spring 21 is located on the inner peripheral surface side of the inner cage 9 and does not come into contact with the outer cage 8, there is no fear of abrasion due to the contact.

The contact portions 25 and 26 need only have a function of contacting the end surface of the pocket 12 to impart elasticity in the diameter increasing direction, and may have any shape. Also,
A contact portion is provided only at one end of the band-shaped spring 21,
The tension may be generated by the abutting portions.

[0027]

As described above, according to the present invention, the continuous band-shaped spring is wound around the inner retainer, and the band-shaped spring can be fixed only by contacting the contact portion provided on the band-shaped spring with the end face of the pocket. The assembling operation can be performed in one step, and the workability of assembling the clutch can be greatly improved.

Further, since the band-shaped spring is brought into close contact with the inner peripheral side of the inner cage and is not sandwiched between the inner and outer cages, wear of the band-shaped spring due to contact does not occur, and durability can be maintained normally. There are advantages.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view showing a two-way differential clutch.

FIG. 2 is a longitudinal sectional side view of the clutch according to the embodiment.

FIG. 3 is a longitudinal sectional side view showing an enlarged main part of the same.

FIG. 4 is a perspective view showing the band spring according to the first embodiment;

FIG. 5 is a longitudinal sectional side view showing a conventional example.

FIG. 6A is a plan view of the same spring member, and FIG. 6B is a front view thereof.

FIG. 7 is a longitudinal sectional side view showing another conventional example.

FIG. 8 is a perspective view of the band spring according to the first embodiment;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Input gear 2 Rotating shaft 3, 4 Cylindrical surface 5 Sprag 8 Outer cage 9 Inner cage 11, 12 Pocket 16, 17 End surface 21 Band spring 22 Sprag insertion hole 23, 24 Elastic claw piece 25, 26 Contact part

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-112153 (JP, A) JP-A-3-199722 (JP, A) JP-A-6-280898 (JP, A) 145328 (JP, U) Japanese Utility Model Application Hei 4-136334 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) F16D 41/00-41/36 B60K 17/26

Claims (1)

(57) [Claims] 1. An input gear and a rotating shaft each having a coaxial cylindrical surface formed on opposite surfaces thereof, and an outer retainer fixed to the input gear between the cylindrical surfaces. And a sprag engaged between the two cylindrical surfaces by a relative rotation of the input gear and the rotating shaft in two directions in a plurality of pockets provided opposite the inner and outer cages. And a plurality of sprag insertion holes corresponding to the respective pockets are provided in the band-shaped spring wound around the inner peripheral surface of the inner retainer, and the sprags are brought into contact with the side surfaces of the sprags on the sides of the respective sprag insertion holes. the form an elastic claw pieces held in a neutral state, the abutment resiliently abuts against the end face of the pocket in the inner side retainer provided in the strip-shaped spring, the elastic abutment of the abutment portion and the pocket end face By
The diameter of the band-shaped spring is expanded to make it close to the inner peripheral surface of the inner cage.
Two-way differential clutch to so that.