JP3118076B2 - Hydraulic power transmission coupling - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic power transmission coupling used for distributing driving force of a vehicle.

[0002]

2. Description of the Related Art The present inventor has disclosed Japanese Patent Application No. 62-286838.
Proposes the following hydraulic power transmission coupling.
That is, the hydraulic power transmission coupling is provided between input and output shafts that are relatively rotatable, and includes flow rate generating means for flowing an amount of fluid according to a rotational speed difference between the two shafts. In a torque transmission joint in which transmission torque between the input and output shafts is controlled, the flow rate generating means is formed integrally with one of the input and output shafts, and has a first rotating member having a cam surface on an inner peripheral portion; A second rotating member formed integrally with the other of the shafts and inserted into the cam surface; and a second rotating member supported by the second rotating member and circumferentially in contact with the cam surface to radially rotate when the two rotating members rotate relative to each other. A cam body that reciprocates, a plurality of fluid chambers that change in volume as the cam body reciprocates,
And a fluid path formed in the rotating member and connecting the fluid chambers through an orifice.

[0003]

However, such a conventional hydraulic power transmission joint has the following problems. (1) Since there was only one accumulator for the entire hydraulic circuit, if the number of plungers was increased to increase the torque capacity of the joint, the number of oil seals that contained oil increased, and the oil seals were damaged. As a result, the probability of oil leaks increased, and it was necessary to strictly manage to increase reliability. (2) When used in a place where the shaft needs to be passed through the center of the joint, it is difficult to design the whole with one accumulator. In other words, the accumulator in which the whole is integrated needs to have a large capacity, and the preload spring corresponding to this needs to be very large, which is not practical. (3) If one of the plungers becomes defective, it will not be possible to perform a sufficient function as a joint.

The present invention has been made in view of such conventional problems, and can improve reliability even if the number of plunger chambers is large. It is an object of the present invention to provide a hydraulic power transmission coupling which can function as a coupling even when the power transmission becomes defective, and can be used where a shaft needs to be passed through the center of the coupling.

[0005]

In order to achieve the above object, the present invention is provided between input / output shafts which are rotatable relative to each other,
In a hydraulic power transmission joint for flowing an amount of fluid in accordance with the rotational speed difference between the two shafts and controlling the transmission torque between the input and output shafts by the flow resistance of the fluid, a cam connected to one of the input and output shafts A first rotating member having a surface, and a second rotating member connected to the other of the input and output shafts to form a plurality of plunger chambers.
A rotating member, and a plunger slidably stored in the plunger chamber to form a plurality of independent groups.
A fluid path formed in the second rotating member and connected between the plunger chambers independently via a flow resistance generating means for each group, and independently provided for each group connected to the plunger chamber . And an accumulator mechanism.

The present invention also provides a one-way valve as a suction valve inside the plunger,
The flow resistance generating means is provided on a bottom plate provided at the bottom of the plunger chamber.

[0007]

In the present invention, the plunger provided in the second rotating member is divided into several independent groups, each of which has an accumulator function. However, reliability can be significantly improved.

Further, even if the differential of one group becomes defective, a sufficient function as a joint can be achieved. Furthermore, even if a joint is used where the shaft passes through the center, it is possible to design compactly, so the degree of freedom of design is expanded, without significantly changing the structure of the conventional differential,
This joint can be inserted.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 are views showing an embodiment of the present invention.
First, the configuration will be described. In FIG. 1 and FIG.
Is a case of a final deceleration mechanism. In the case 1, a hypoid shaft 2 is rotatably supported via roller taper bearings 3 and 4, and a head of the hypoid shaft 2 is provided with a differential device via a pilot bearing 5. Is rotatably supported by the differential case 6.

A hypoid pinion 7 is formed integrally with the hypoid shaft 2, and the hypoid pinion 7 meshes with a ring gear 8. A differential case 6 is integrally connected to the ring gear 8, and a pinion shaft 9 is fixed to the differential case 6. A pinion 10 is formed integrally with the pinion shaft 9, and side gears 11 and 12 mesh with the pinion 10, respectively.

A cam housing 13 as a first rotating member is connected to the differential case 6, and a cam surface 14 is formed on the cam housing 13. A rotor 15 as a second rotating member is connected to the side gear 11, and the rotor 15 has nine plunger chambers 16 formed in the radial direction. Return spring 1 in plunger chamber 16
The plunger 18 is slidably accommodated through the plunger 7.

When the plungers 18A, 18B and 18C are 1
Groups of plungers 18D, 18E, 18F
Group one plunger 18G, 18H, 1
8I make up one group each, for a total of 3
Divided into two groups. A one-way valve 19 is housed inside the plunger 18 as a suction valve,
The one-way valve 19 includes a check ball 22 seated in a suction hole 21 formed in a bottom plate 20 press-fitted into the bottom of the plunger chamber 16, a check spring 23 pressing the check ball 22, a spring 23, and a retainer 24 supporting the check spring 23. It is composed of Oil holes 25 and 26 are formed in the retainer 24 so that oil flows to the bottom and the cylindrical portion without resistance.
The bottom plate 20 is a plunger chamber 16 of the rotor 15.
The oil is press-fitted into the inner wall so that the oil does not flow from the outer diameter.

One accumulator mechanism 27 is provided for each group. The accumulator mechanism 27 communicates with the plunger chamber 16 through an orifice 28 formed on the bottom plate 20 as flow resistance generating means and a suction hole 21. 29 and accumulator room 29
An accumulator piston 30 is slidably housed in the storage device and a return spring 31 presses the accumulator piston 30.

The position of the accumulator piston 30 in FIGS. 1 and 2 shows a state at low temperature. When the joint rotates by differential and the oil temperature rises, the oil expands and pushes down the return spring 31 to push down the accumulator chamber 29. To secure the capacity. The plunger chambers 16 are communicated with each other by fluid passages 32 and 33 through suction holes 21 formed in the bottom plate 20 and orifices 28 as flow resistance generating means.

A screw hole 34 is formed in the middle of the fluid passage 33, and the screw hole 34 is formed in the screw hole 34 as shown in FIG.
The bolt 36 is screwed through 5. It is necessary to assemble the joint by filling the plunger chamber 16 and the accumulator chamber 29 with oil. By receiving the oil from 37 and tightening the bolt 36, 100% of the oil can be sealed inside.

Reference numeral 38 denotes an air vent hole formed at the bottom of the rotor 15 for improving the movement of the plunger 18. 39 is a V-seal, and 40 is an O-ring. Next, the operation will be described. When a rotation difference occurs between the cam housing 13 and the rotor 15, the plunger 18 in the discharge stroke is radially pushed by the cam surface 14 of the cam housing 13.

The oil in plunger chamber 16 flows through orifices 28 to fluid passages 32 and 33. At this time, the hydraulic pressure in the plunger chamber 16 increases due to the resistance of the orifice 28, and a reaction force is generated in the plunger 18. By rotating the cam housing 13 against the plunger reaction force, a torque is generated, and the torque is transmitted between the cam housing 13 and the rotor 15.

FIG. 4 shows the state of the hydraulic pressure generated by the plungers 18A, 18B, 18C when the joint rotates differentially, that is, the state of the torque that can be transmitted. In FIG. 4, A represents the torque characteristic of the plunger 18B, B represents the torque characteristic of the plunger 18A, and C represents the plunger 18B.
C shows the torque characteristics. D indicates the total torque transmitted by each plunger 18A, 18B, 18C, and is constant with respect to the rotation angle.

The same torque characteristics are obtained for the plungers 18D, 18E, 18F and the plungers 18G, 18H, 18I, which can transmit three times the torque of D for the entire joint. Double the state. This is shown in FIG. In FIG.
E indicates the torque characteristics of one group, F indicates the total torque characteristics of the two groups, and G indicates the total torque characteristics of the three groups.

As described above, even if one or two groups are defective, the joint can transmit the torque and perform its function. Since the plunger 18 is divided into several independent groups and the accumulator mechanism 27 is provided in each group, the reliability can be improved even with a large-sized joint having a large number of plunger chambers.

Further, since the one-way valve 19 is accommodated in the plunger 18, a joint can be provided on an axis passing through the center. In this embodiment, the example in which the plunger chamber is formed in the radial direction has been described. However, the present invention is not limited to this, and can be applied to an example in which the plunger chamber is formed in the axial direction.

[0022]

As described above, according to the present invention, the reliability can be improved even for a joint having a large number of plunger chambers, and one group becomes defective. Can also function as a joint,
Furthermore, it can be provided on an axis passing through the center.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG. 1;

FIG. 3 is a diagram showing bolts provided in a fluid path.

FIG. 4 is a graph showing a rotation angle and a transmission torque;

FIG. 5 is a graph showing torque characteristics.

[Explanation of symbols]

 1: Case 2: Hypoid shaft 3, 4: Roller taper bearing 5: Pilot bearing 6: Differential case 7: Hypoid pinion 8: Ring gear 9: Pinion shaft 10: Pinion 11, 12: Side gear 13: Cam housing 14: Cam surface 15 : Rotor 16: Plunger chamber 17: Return spring 18, 18A to 18I: Plunger 19: One-way valve 20: Bottom plate 21: Suction hole 22: Check ball 23: Check spring 24: Retainer 25, 26: Oil hole 27: Accumulator mechanism 28: Orifice (flow resistance generating means) 29: Accumulator chamber 30: Accumulator piston 31: Return spring 32, 33: Fluid path 34: Screw hole 35: Washer 36: Bolt 37: Notch 38: vent 39: V Seal 40: O-ring

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16D 31/02

Claims (4)

(57) [Claims] An input / output shaft is provided between input / output shafts which are rotatable relative to each other. An amount of fluid flows in accordance with a rotational speed difference between the two shafts, and a transmission torque between the input / output shafts is controlled by a flow resistance of the fluid. A hydraulic power transmission coupling, wherein a first rotating member connected to one of the input / output shafts and having a cam surface; a second rotating member connected to the other of the input / output shafts and forming a plurality of plunger chambers; A plunger slidably housed in the plunger chamber to form a plurality of independent groups, and the plunger chamber formed in the second rotating member and independently for each group via a flow resistance generating means A fluid path to be connected and the plunger chamber
And an accumulator mechanism independently provided for each group connected to the hydraulic power transmission joint. 2. The method according to claim 1, wherein a one-way valve as an intake valve is provided inside the plunger, and the flow resistance generating means is provided on a bottom plate provided at the bottom of the plunger chamber. Hydraulic power transmission coupling. 3. The hydraulic power transmission coupling according to claim 1, wherein said first rotating member is connected to a differential case of a differential gear. 4. The hydraulic power transmission coupling according to claim 1, wherein said second rotating member is connected to a side gear of a differential gear.