JPH0221035A - Two-direction differential clutch - Google Patents

Abstract

PURPOSE:To enable rotation to be transmitted or cut off in right and left directions on its input side, by providing a sub-gear which generates differential speed in response to rotation of its input gear, and shifting its roller in an engaged state. CONSTITUTION:A sub-gear 8 is inserted in between an input gear 2 and an output gear 4. Rotation of its driving shaft side is transmitted to the input gear 2 and the sub-gear, each being engaged with a two-direction differential sub-gear. The number of teeth of the sub-gear 2 is bigger than that of the teeth of the input-gear 2, so that rotation of the sub-gear 8 is delayed with respect to rotation of the input gear 2, the gears being rotated about the same driving shaft. Rotation can thus be transmitted or cut off in right and left directions on its input side.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a two-way differential clutch that enables transmission or interruption of rotation in both left and right directions on the input side.

(Prior technology) Part-time 4-wheel drive vehicle (hereinafter also referred to as 4WD vehicle)
Differential clutches, or overrunning clutches, have come into use in cars that automatically transmit driving force to the front wheels the moment the rear wheels slip and the speed drops.

In such a differential clutch, the front wheel hub is set to rotate faster than the drive shaft, and the rotation of the drive shaft is not transmitted to the front wheel hub during two-wheel drive.

When the rear wheel slips and the rotation of the drive shaft increases, the drive shaft and front wheel hub become engaged due to the wedge action of the roller or ball inserted into the gap between the drive shaft and front wheel hub, and the rotation is transmitted to the front wheel hub. be done.

However, in order to create 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 when rotating in one direction, there is a problem in that it cannot drive the front wheels when going backwards. Ta. Further, even in differential clutches that use sprags instead of the rollers or balls described above, the action of the sprags is limited to one direction, and this is accompanied by the above-mentioned problems.

(Problems to be Solved by the Invention) The present invention was made by focusing on such conventional problems, and it is 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 providing.

(Means for Solving the Problems) The above object includes an input gear provided along the outer periphery of a rotating shaft, and a polygonal cam provided in parallel with the input gear along the outer periphery of the rotating shaft. , an output gear is fitted around the outer periphery of the polygonal cam with a gap therebetween, and both ends formed by each side of the polygonal cam and the inner circumferential surface of the output gear form a wedge-shaped gap. A two-way differential clutch comprising a roller that is inserted into an engaged state when positioned at an end of the wedge-shaped gap, and a holding member that accommodates the roller, the clutch having more teeth than the number of teeth of the input gear. a two-way differential clutch that is provided with a sub-gear having a plurality of numbers and generates a differential speed in response to the rotation of the input gear, and that the sub-gear cooperates with the holding member to shift the rollers into an engaged state. This is achieved by

(Function) In the above configuration, since the number of teeth on the sub gear is greater than the number of teeth on the input gear, the sub gear rotates later than the input gear due to the same rotational input, and this speed difference causes the number of teeth on the input gear to rotate. In either case of left or right rotation, the roller can be moved to one end of the wedge-shaped gap and the rotating shaft and output gear can be meshed, so rotation of the input gear in both left and right directions can be controlled by the output. can be transmitted to or cut off from the main gear.

(Example) The present invention will be described below based on drawings showing examples. FIG. 1 shows a longitudinal sectional view of a two-way differential clutch according to the present invention, and FIG. 2 shows a sectional view taken along the line A--A in FIG. 1
is a rotating shaft, and has various steps on its outer peripheral surface. Reference numeral 2 denotes an input gear, which is connected to one stepped portion of the rotating shaft 1 by a spline 2a. 2b is the input
Teeth are provided on the outer periphery of the gear 2 and mesh with a gear on the drive shaft side (not shown). 3 is a polygonal cam, which is provided in parallel with the input gear 2 on another step on the outer periphery of the rotating shaft 1. . Reference numeral 4 denotes an output gear, which is fitted around the outer periphery of the polygonal cam 3 with a gap 5 therebetween. 4a is the output
The teeth are provided on the outer periphery of the gear 4 and mesh with a gear on the driven shaft side (not shown). As seen in the enlarged view of the main part in FIG. 3, the inner cylindrical surface 16 of the output gear 4 and the input shaft 1
The surfaces (hereinafter referred to as wedge-shaped surfaces) of a pair of wedge-shaped gaps 5 in the forward and reverse rotation directions formed by the polygonal cam surfaces (hereinafter referred to as wedge-shaped surfaces) 15.16
．． A pair of rollers 6° and 6° are arranged at 15° and 16°. The roller 6.6' is located in the pocket 9a of the holding member 9.
A pair of rollers are stored in each pair, and a pocket 9a is provided between the rollers.
A spring 7 is disposed to press the pair of rollers 6.6'' against each other in parallel with the axial direction of the rollers 6.6'' toward opposing wall surfaces.

As seen in FIG. 3, in the neutral state, roller 6.
6° is a pair of wedge-shaped surfaces in the forward and reverse rotation directions 15.16.1
It is not in contact with either 5' or 16°. 8 is sub-
This gear is inserted between input gear 2 and output gear 4.

Numeral 8a denotes teeth provided on the outer periphery of the sub-gear 8, which, like the input gear 2, mesh with a gear (not shown) on the drive shaft side. A holding member 9 is attached to the inner peripheral side of the sub-gear 8, and a holding member 9 is attached to the rotating shaft 1.
is slidably inserted into the outer periphery of the The holding member 9 and the sub-gear 8 are pressed into contact with each other by a disc spring 10 between the stepped end face of the rotary shaft 1 and the side face of the input gear. Holding member 9
A part of the inner peripheral side is cut out and a notch 11 is provided,
- A stopper 1a is provided protruding from the left rotation shaft 1 at a position facing the notch 11. 12 to 14 are bearings that support the rotating shaft 1.

The operation of the two-way differential clutch configured as above will be explained. When this two-way differential clutch is provided, for example, in a power transmission device of a part-time 4WD vehicle, rotation on the drive shaft side is transmitted to the input gear 2 and sub gear 8 that mesh with the drive shaft. However, *2a of input gear 2 has, for example, 53 teeth, whereas
The number of teeth 8a of the sub gear 8 is set to, for example, 54, and the rotation of the sub gear 8 lags behind the rotation of the input gear 2 due to the rotation of the same drive shaft. Therefore, as shown in FIG. 4, the holding member 9 that is pressed against the sub-gear 8 has a differential speed with respect to the rotation of the rotating shaft 1, and the left side surface of the notch 11 of the holding member 9 Stopper 1
It rotates relatively in the clockwise rotation direction until it comes into contact with a. A pair of rollers 6 housed in pockets 9a of holding member 9
The roller 6' on the right side in the drawing at 6° is pressed against the wedge-shaped surfaces 15° and 16' by the spring force of the spring 7.

In two-wheel drive mode, output gear 4
Since the rotation of the input gear 2 is set to rotate faster than the rotation of the input gear 2, the roller 6° will not idle and become wedged in the wedge-shaped surfaces 15' and 16'. 15° It does not touch 16, so it does not get caught. On the other hand, if there is slippage in the rear wheels, the rotation speed of the drive shaft increases, so the rotation of the polygonal cam 3 becomes faster than the rotation of the output gear 4, and the wedge-shaped surface 15° 16°
The roller 6', which is pressed by the roller 6', is engaged and the rotational force of the rotating shaft 1 is transmitted to the output gear 4.

After the stopper 1a comes into contact with the wall of the notch 11, the sub-
Since the holding member 9 rotates idly with respect to the gear 8, the sub-gear 8 will not be damaged.The wedge action of the roller 6.6° due to the differential speed of the sub-gear 8 causes the input gear 2 to Since it is not concerned with the direction of rotation, this two-way differential clutch functions effectively even when a part-time four-wheel drive vehicle is traveling in reverse.

FIG. 5 shows a second embodiment in which, compared to the first embodiment, the wedge-shaped surfaces 15, 16, 1
The difference is that they abut at 5° and 16°, and the other structure and operation are the same as in the first embodiment.

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

(Effects of the Invention) By using a two-way differential clutch configured as described above, the rotation of the input gear can be transmitted to the output gear in either the left or right direction. , or can be blocked.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a first embodiment of the present invention, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIG. 3 is an enlarged view of the main part of FIG. 2.
FIG. 4 is an explanatory diagram of the operation, FIG. 5 is an enlarged view of the main part of the second embodiment, and FIG. 6 is a longitudinal sectional view of the third embodiment. 1...Rotating shaft 2...Input gear 3...Polygonal cam 4...Output gear 5...Wedge-shaped gap 6.6'...Roller 8...Sub gear 9 ...Retaining member applicant: Aichi Machine Industry Co., Ltd. 8 [person: NCH NTO BEARLINK Co., Ltd., agent, patent attorney Yoshihisa Shimizu]] 1a Funeral map

Claims (1)

[Claims] An input gear provided along the outer periphery of the rotating shaft,
a polygonal cam provided along the outer periphery of the rotating shaft in parallel with the input gear; an output gear extrapolated to the outer periphery of the polygonal cam with a gap; a roller whose ends formed by each side and an inner circumferential surface of the output gear are inserted into a wedge-shaped gap, and which become engaged when positioned at an end of the wedge-shaped gap; and a holding member that accommodates the roller. a two-way differential clutch having a sub-gear having a number of teeth greater than the number of teeth of the input gear and generating a differential speed in response to the rotation of the input gear; A two-way differential clutch that moves the rollers into an engaged state in cooperation with the holding member.