JPS5846229A - Friction clutch - Google Patents

Abstract

PURPOSE:To prevent power transmission capacity from deteriorating by discharging friction powder outside of a contacting plane, by providing one continuous spiral groove which runs in an external diametrical direction from an internal diametrical direction on the contacting plane of a clutch plate. CONSTITUTION:Radial slits 14a are notched on both faces of each of friction plates 14 on both sides of which are provided with a plurality of clutch plates 15. Both sides of each of the clutch plates 15, that is, each of the contacting planes is provided with one continual V section spiral groove 16 which runs in an external diametrical direction from an internal diametrical direction. In addition to the above, connecting protrusions 15a are formed at regular pitch angles on four spots of the external circumference 4 of each of the clutch plates 15 in a body, and connecting protrusions 15a of each of the clutch plates 15 are connected with notched parts 9b formed on the clutch housing 9 movably in an axial direction and rotatably in a body in a circumferential direction.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a friction clutch in which foreign matter interposed between the contact surfaces of a clutch plate and a friction plate is effectively discharged to the outside through the groove.

A clutch plate is fixed to one shaft end, and a friction plate is fixed to the other shaft end, and these clutch plates and friction plates are pressed together, and the two shafts are connected by the frictional force between the contact surfaces between the drawing plates. Friction clutches are used for general power transmission, automobiles, and machine tools.

The frictional force generated between the contact surfaces of the clutch plate and the friction plate is determined by the force pressing the contact surface and the friction coefficient of the contact surface based on the combination of the materials of the clutch plate and the friction plate. At the initial stage of contact with the friction plate, the drawing plate will slip somewhat.

In other words, connect the clutch. If the rotational speed of the driven shaft reaches that of the driving shaft, slippage occurs on the contact surface between the clutch plate and the friction plate, and this slippage causes It is unavoidable that the contact surface will be worn out and heated.

By the way, conventionally, the wear powder generated by the above-mentioned slipping was interposed between the contact surfaces of the clutch plate and the friction plate and was not discharged to the outside, so the friction coefficient of the contact surface of the drawing board decreased as the wear powder increased. However, there were disadvantages such as a decrease in the power transmission ability of the clutch.

In view of the above-mentioned disadvantages in this type of friction clutch, the present inventors have devised the present invention to effectively and rationally solve the problem. By providing one continuous spiral groove extending in the outer radial direction from the clutch plate 6, the abrasion powder generated by sliding between the clutch plate 6 and the friction plate and accumulated between the contact surfaces of both plates can be removed from the clutch plate. To provide a friction clutch which can effectively discharge water to the outside of a contact surface through a spiral groove, keep the friction coefficient of the contact surface of a drawing board constant at all times, and prevent a decrease in power transmission ability.

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

Figure 1 is a cross-sectional plan view of the vehicle's power transmission system, and Figure 2 is a cross-sectional plan view of the vehicle's power transmission system.
3 is an exploded perspective view of the friction clutch, FIG. 4 is a plan view of the clutch plate, and FIG. 5 is a sectional view taken along the line 5-5 in FIG.

In FIG. 1, reference numeral 1 denotes a crankshaft that is the output shaft of an engine A, and a drive pulley 2 is provided at one extending end of the crankshaft 1.

On the other hand, a driven shaft 3 is rotatably supported horizontally rearward of the crankshaft 1 in parallel with the crankshaft 1, and a driven shaft 3 is provided with a driven pulley 4. A V-belt 5 is stretched between the pulleys 2 and constitutes a known belt type automatic transmission.The driven shaft 3 is connected to an axle 6 via a reduction gear train B.
The other axle q is coaxially connected to this by a friction clutch C according to the present invention. Wheels 8, 8 are connected to the ends of these left and right axles 6.7, respectively.

The friction clutch C is constructed as shown in detail in FIGS. 2 and 3.

That is, a substantially bowl-shaped clutch outer 9 is integrally fastened to the opposite end of one axle 6 with a nut 11 via a fixing member 10 . The cylindrical portion 9a of the clutch outer 9 has four holes at equal angular intervals (90 degrees
Cutout portions 9b are formed at intervals of 100 degrees.

On the other hand, the small diameter end 6a of the axle 6 faces into the hollow part 7b formed at the center of the large diameter end 7a of the axle 7, and a bearing is provided between the hollow part 7b and the small diameter end 6a of the axle 6. 12 is interposed, and the i-to-shafts 6.7 are configured to be rotatable relative to each other. Note that 13 in the figure is an oil seal.

A plurality of spline grooves 7c... are formed in the axial direction on the outer periphery of the large diameter end 7a of the axle 7, and a plurality of (two in the illustrated example) friction plates 14, 14 are installed in these grooves 7C... It is slidable in both directions, and is spline-fitted in the circumferential direction to rotate together with the axle 7. Each of the friction plates 14 is formed into an annular shape as shown in FIG.
A... is engraved. And these friction plates 14.
A plurality of clutch plates 15 (three in the illustrated example) are arranged on both sides of the clutch 14, that is, the clutch plates 15 and the friction plates 14' are arranged alternately. This constitutes a so-called multi-stage clutch.

On both sides of each clutch plate 15, that is, in the solid contact portion, there is one continuous spiral groove 16, 1.6 with a V-shaped cross section extending from the inner diameter direction to the outer diameter direction, as shown in FIGS. 4 and 5. is provided. The cross-sectional shape of the spiral goose is arbitrary. Each clutch plate 15 has four locations on its outer periphery at equal angular pitches (9
0 degree pitch), the engaging protrusions 15a are integrally formed on each clutch plate 15. The engaging protrusions 15a are movable in the axial direction in the notches 9b formed in the clutch outer 9, and are secured in the circumferential direction so as to rotate together with the outer 9.

The axial movement of the friction plates 14.14 and the clutch plates 1.5... is regulated by a stopper ring 17 fitted to the inner periphery of the open end of the clutch outer 9. It is constantly pressed with a constant contact pressure by a spring 18 compressed inside.

In this way, a multi-stage friction clutch C is constructed.

Next, the operation of the friction clutch C will be explained.

The power generated by engine A is generated by crankshaft 1 and drive side boolean I.
72, V Bell! -5, driven pulley 4, driven shaft 3. The signal is transmitted to one axle i through the reduction gear train B, and the axle 6 is rotationally driven. At the same time, the other axle 7 (also connected to the axle 6 by the friction clutch C, that is, by the frictional resistance force acting on the contact surface between the clutch plate 15 of the friction clutch C and the friction plate 14), It rotates integrally with the axle 6.The rotation of these axles 6 and 7 causes the left and right wheels 8.8 to rotate, and the vehicle moves forward.

By the way, since the two axles 8.8 are separated from each other, a rotational difference must occur between the wheels 8, 8, that is, the axle 6.7 when the vehicle is cornering. For this vehicle.

This rotational difference is made possible by the sliding between the friction plates 14, 14 of the friction clutch C and the clutch plates 15, . . . .

That is, in this vehicle, the friction clutch C functions as a differential device.

Therefore, in this vehicle, slipping occurs between the friction plates 14, 14 and the clutch plates 15 each time cornering, and this slipping causes each plate to wear, and this wear causes wear particles to be generated. Ru.

However, the abrasion powder generated on the contact surfaces of each plate is accommodated in the spiral grooves 16.16 formed on both sides of each clutch plate 15, and the abrasion powder in these grooves 16.16 is transferred to the clutch plates 15 that are in contact with each other. Due to the relative sliding between the disk and the friction plate 14, it is gradually moved from the inner diameter side to the outer diameter side along each spiral groove 16, and is finally discharged to the outside.

In this way, the abrasion powder is effectively discharged to the outside and is not interposed between the contact surfaces of the friction plate 14 and the clutch plate 15, so that the friction coefficient of the contact portion of the drawing plate 14.15 is always kept at a constant desired value. value can be maintained.

By the way, as described above, the value of the frictional force generated at the contact surface between the friction plate 14 and the clutch plate 15 depends on the force pressing the contact surface and the friction coefficient of the contact surface. Among the above factors that influence the value of frictional force, one of the pressing forces is constant because it is equal to the elastic force of the spring 18 in this embodiment, and the other factor, the coefficient of friction, always maintains a constant value. Therefore, the generated frictional force always maintains a constant value, and as a result, the clutch C
The two power transmission capacities will also be kept constant.

Although the above explanation has been given by way of example in which a multi-stage friction clutch is applied to a vehicle, the friction clutch according to the present invention may be of a single stage or may be applied to any other model.

As is clear from the above explanation, according to the present invention, since one continuous spiral groove is provided on the contact surface of the clutch plate from the inner diameter direction to the outer diameter direction, the groove is generated by the sliding between the clutch plate and the friction plate. Abrasion powder can be effectively discharged and removed to the outside through the spiral groove provided in the clutch plate, and the friction coefficient of the contact surface of the drawing plate can be kept constant at all times, thereby preventing a decrease in the power transmission ability of the friction clutch. can do 0

[BRIEF DESCRIPTION OF THE DRAWINGS] The drawings show one embodiment of the present invention, in which FIG. 1 is a cross-sectional plan view of the power transmission system of a vehicle, FIG. 2 is an enlarged cross-sectional plan view of the friction clutch portion of FIG. 1, and FIG. Figure 3 is an exploded perspective view of the friction clutch.
FIG. 4 is a plan view of the clutch plate, and FIG. 5 is a sectional view taken along line 5-5 in FIG. In the drawing, 6.7 is an axle, 9 is a clutch outer, 14 is a friction plate, 15 is a clutch plate, 16 is a spiral groove, A is an engine,
B is a reduction gear train, C is a friction clutch 0

Claims (1)

[Scope of Claims] A friction clutch in which a clutch plate fixed to a shaft end and a friction plate are brought into pressure contact with each other, and two shafts are connected by the frictional force between the contact surfaces of the drawing plates. A friction clutch characterized in that the contact surface of the clutch plate is provided with one continuous spiral groove extending from the inner diameter direction to the outer diameter direction.