JPH0781598B2 - 2-way differential clutch - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-way differential clutch that enables transmission or interruption of rotation in both left and right directions on an input side.

(Prior Art) In a part-time four-wheel drive vehicle (hereinafter also referred to as a 4WD vehicle), a differential clutch or overrunning that automatically transmits driving force to the front wheels at the moment when the rear wheels slip and the speed drops. Mold clutches have come into use. In such a differential clutch, the front wheel hub is set to rotate faster than the drive shaft, and rotation of the drive shaft is not transmitted to the front wheel hub during two-wheel drive. When the rear wheels slip and the rotation of the drive shaft increases, the wedge action of the rollers or balls inserted in the gap between the drive shaft and the front wheel hub causes the drive shaft and the front wheel hub to mesh with each other, and the rotation is transmitted to the front wheel hub. It However, in order to cause a wedge action in this differential clutch, a saw-shaped cam is provided on the surface of the drive shaft, and since it operates only in one direction of rotation, there is a problem that the front wheels cannot be driven during reverse travel. It was Further, even in the differential clutch using the sprags instead of the rollers or balls, the action of the sprags is limited to one direction, and the above-mentioned problems are involved.

(Problems to be Solved by the Invention) The present invention has been made in view of such a conventional problem, and is directed to a two-way differential clutch that enables transmission or interruption of rotation in both left and right directions on the input side. For the purpose of provision.

(Means for Solving the Problems) The above object is to provide an input gear provided along the outer circumference of a rotating shaft, and a polygonal cam provided in parallel with the input gear along the outer circumference of the rotating shaft. An output gear externally inserted with a gap on the outer periphery of the polygonal cam, and both ends formed by each side of the polygonal cam and the inner peripheral surface of the output gear form a wedge-shaped gap. A two-way differential clutch having a roller that is inserted and brought into a meshing state when positioned at an end of the wedge-shaped gap, and a holding member that accommodates the roller, and has more teeth than the number of teeth of the input gear. A two-way differential clutch that has a number of sub gears that generate a differential speed corresponding to the rotation of the input gear, and cooperates with the holding member to shift the rollers into a meshed state. Achieved by To be done.

(Operation) In the above configuration, since the number of teeth of the sub gear is greater than the number of teeth of the input gear, the same rotation input causes the sub gear to rotate later than the input gear, and this difference in speed causes the input gear to rotate. In either case of left rotation or right rotation, the roller can be moved to one end of the wedge-shaped gap to engage the rotation shaft and the output gear, so that rotation of the input gear in both left and right directions is output. Can be transmitted to or disconnected from the gear.

(Embodiment) The present invention will be described below with reference to the drawings illustrating an embodiment. 1 is a longitudinal sectional view of a two-way differential clutch according to the present invention, and FIG. 2 is a sectional view taken along the line AA of FIG.
Reference numeral 1 is a rotating shaft, which has various steps on its outer peripheral surface. Two
Is an input gear, which is connected to one step of the rotary shaft 1 by a spline 2a. Reference numeral 2b is a tooth provided on the outer periphery of the input gear 2 and meshes with a gear on the drive shaft side (not shown). A polygonal cam 3 is provided in parallel with the input gear 2 at another step portion on the outer circumference of the rotary shaft 1.
Reference numeral 4 denotes an output gear, which is externally inserted with a gap 5 on the outer periphery of the polygonal cam 3. 4a is output gear 4
The teeth provided on the outer periphery of the gear mesh with the gear on the driven shaft side (not shown). As shown in the enlarged view of the main part of FIG. 3, a pair of wedge-shaped gaps 5 in the forward and reverse rotation directions formed by the inner peripheral cylindrical surface 16 of the output gear 4 and the polygonal cam surface of the input shaft 1 are formed. Surface (hereinafter referred to as wedge-shaped surface) 15,16,15 ', 16'
A pair of rollers 6 and 6'is provided in the. Roller 6,6 ′
Are housed in pairs in the pockets 9a of the holding member 9, and between the rollers, springs 7 for pressing the pair of rollers 6, 6'to each other toward the opposite wall surfaces parallel to the axial direction of the pocket 9a are arranged. It is set up. As seen in FIG. 3, in the neutral state, the rollers 6,6 'are not in contact with any of the pair of wedge-shaped surfaces 15, 16, 15', 16 'in the forward and reverse rotation directions. Reference numeral 8 denotes a sub gear, which is inserted between the input gear 2 and the output gear 4. Reference numeral 8a is a tooth provided on the outer circumference of the sub gear 8 and meshes with a gear (not shown) on the drive shaft side like the input gear 2. Sub gear 8
A holding member 9 is slidably inserted into the outer circumference of the rotary shaft 1 on the inner circumference side of the. The holding member 9 and the sub gear 8 are disc springs.
By means of 10, the end face of the step portion of the rotary shaft 1 and the side face of the input gear are pressed against each other. A part of the holding member 9 is cut out on the inner peripheral side to form a notch 11, while the rotary shaft 1 is provided with a stopper 1 a at a position facing the notch 11. 12
Reference numerals 14 to 14 are bearings for supporting the rotary shaft 1.

The operation of the two-way differential clutch configured as described above will be described. When this two-way differential clutch is installed in, for example, a power transmission device of a part-time type 4WD vehicle, the rotation on the drive shaft side meshes with the input gear 2 and the sub gear.
It is transmitted to the gear 8. However, input gear 2
The tooth 2a of the sub gear 8 has, for example, 53 teeth, while the tooth 8a of the sub gear 8 has, for example, 54 teeth, and the rotation of the same drive shaft causes the rotation of the sub gear 8 to be input.・ It will be later than the rotation of gear 2. Therefore, as shown in FIG. 4, the holding member 9 pressed against the sub gear 8 has a differential speed with respect to the rotation of the rotary shaft 1 and the left side surface of the notch 11 of the holding member 9 is It rotates relative to the right until it contacts the stopper 1a. And the pocket of the holding member 9
The roller 6'on the right side of the figure among the pair of rollers 6,6 'housed in the 9a has a wedge-shaped surface 15', 1 due to the spring force of the spring 7.
Pressed 6 '. Here, in the two-wheel drive state, the rotation of the output gear 4 is set to rotate faster than the rotation of the input gear 2, so that the roller 6'idles to the wedge-shaped surfaces 15 'and 16'. It won't bite you. Also, of course, the roller 6 does not engage with the wedge-shaped surfaces 15 and 16 and therefore does not bite. On the other hand, if there is a slip on the rear wheel, the rotation speed of the drive shaft increases, so that the rotation of the polygonal cam 3 becomes faster than the rotation of the output gear 4, and the wedge-shaped surface is rotated.
The roller 6'pressed by 15 'and 16' engages and transmits the rotational force of the rotary shaft 1 to the output gear 4. After the stopper 1a comes into contact with the wall surface of the notch 11, the holding member 9 idles with respect to the sub gear 8, so that the sub.
The gear 8 is not damaged. Such a sub gear 8
Since the wedge action of the rollers 6 and 6'due to the differential speed is not related to the direction of rotation of the input gear 2, this two-way differential clutch is effective even when the part-time four-wheel drive vehicle is in reverse. Function.

FIG. 5 shows a second embodiment, which is different from the first embodiment in that the rollers 6, 6'are in contact with the wedge-shaped surfaces 15, 16, 15 ', 16' in the neutral state. Structure and operation of the first
Same as the embodiment.

FIG. 6 shows a third embodiment, which is different from the first embodiment only in the pressure contact structure between the holding member 9 and the sub gear 8. That is, the sub gear 8 is pressed by the disc spring 10 between the retaining ring 17 attached to the holding member 9 and the side surface of the step portion of the holding member 9.

(Effects of the Invention) The present invention uses the two-way differential clutch having the above-described configuration to transmit the rotation to the output gear regardless of whether the input gear rotates leftward or rightward. , Or can be blocked.

[Brief description of drawings]

1 is a longitudinal sectional view of a first embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is an enlarged view of a main part of FIG.
FIG. 4 is an operation explanatory view, FIG. 5 is an enlarged view of a main part of the second embodiment, and FIG. 6 is a vertical sectional view of the third embodiment. 1 ... Rotary shaft 2 ... Input gear 3 ... Polygonal cam 4 ... Output gear 5 ... Wedge gap 6,6 '... Roller 8 ... Sub gear 9 ... Holding member

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiromi Nojiri 1019-68 Akigashima, Iwata-shi, Shizuoka

Claims (1)

[Claims] 1. An input gear provided along the outer circumference of a rotary shaft, a polygonal cam provided in parallel with the input gear along the outer circumference of the rotary shaft, and an outer circumference of the polygonal cam. An output gear externally inserted with a gap, both ends formed by each side of the polygonal cam and the inner peripheral surface of the output gear are inserted into a wedge-shaped gap, and an end of the wedge-shaped gap is formed. A two-way differential clutch including a roller that is in mesh with each other when positioned at a position of the input gear, and a holding member that accommodates the roller, the number of teeth being greater than the number of teeth of the input gear. A two-way differential clutch in which a sub-gear that generates a differential speed corresponding to rotation is provided, and the sub-gear cooperates with the holding member to shift the roller to an engaged state.