JPS597626Y2 - Reinforcement ring retaining structure for clutch outer in multi-plate friction clutch - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a clutch outer reinforcing ring retaining structure in a multi-disc friction clutch.

More specifically, when fitting a reinforcing ring to the outer periphery of a drum-shaped clutch outer in which a plurality of guide protrusions are arranged in parallel in the circumferential direction in order to mount a friction plate so as to be freely movable only in the axial direction, the clutch outer, A concave portion such as a hole is formed on one side of the ring, and a convex portion that engages with the concave portion is formed on the other side, so that the reinforcing ring can be fitted to the clutch outer while reliably preventing it from coming off through the concave-convex engagement. The present invention relates to a structure for preventing the reinforcing ring from slipping off of the clutch outer in a multi-disc friction clutch, which allows the reinforcing ring to come off with a simple structure.

A multi-plate friction clutch consists of a drum-shaped clutch outer and a clutch inner built into the clutch outer, each of which has a plurality of friction plates fitted so as to be movable only in the axial direction.

The friction plate on the inner side of the clutch intervenes between the friction plates on the outer side of the clutch, and both friction plates frictionally engage and contact to force the clutch to connect, transmitting power, and when both friction plates separate, the clutch is disconnected. do.

The drum-shaped clutch outer has guide protrusions arranged in the circumferential direction, and a guide groove is formed between the guide protrusions.By fitting the outer peripheral base of the friction plate into the guide groove, the friction on the clutch outer side is reduced. The plate is attached to the clutch outer so that it can move freely in the axial direction, and its position in the rotational direction is regulated.

Since the guide protrusion is connected to the clutch outer body only at its base, it is difficult to obtain the required strength.
Due to the centrifugal force caused by the high-speed rotation of the clutch outer, the guide protrusion deforms into a curved shape that expands outward from the tip side, and in the worst case,
It is possible that the guide protrusion breaks off from the base portion.

In order to solve this problem and obtain the necessary strength, it has been conventional practice to fit a reinforcing ring to the outer periphery of a drum-shaped clutch outer having a guide projection.

Even if the reinforcing ring is simply fitted to the clutch outer, the reinforcing ring may fall off from the clutch outer when the multi-disc friction clutch is operated, which is structurally unsatisfactory.

One conventional way to solve this problem was to form an annular groove on the outer periphery of the clutch outer and fit a reinforcing ring into this groove. In addition to this, even if the reinforcing ring was fitted into the groove, the ring would escape from the groove due to the operation of the multi-disc friction clutch, and it was not always possible to securely fit the reinforcing ring into the groove.

In addition, during high-speed rotation, the guide protrusion tends to deform into a curved shape that expands outward from the tip side as described above, but in order to effectively exert the reinforcing effect of the reinforcing ring, In order to prevent plastic deformation of the reinforcing ring itself, it is desirable that the outer circumferential surface of the reinforcing ring always remain parallel to the clutch axis without being curved.

The inventor of the present invention has developed the present invention in view of the above-mentioned conventional problems and to solve them in a simple manner.

The purpose of this invention is to connect the clutch outer side friction plate and the clutch inner side friction plate through frictional engagement, and connect the clutch outer side friction plate to the guide groove between the guide protrusions formed on the outer side of the clutch. In a multi-disc friction clutch mounted so as to be movable only in the axial direction, a small concave portion is formed in the radial direction on either the drum-shaped clutch outer or the reinforcing ring fitted on the outer periphery of the clutch outer. On the other hand, a small convex portion is formed in the radial direction to engage with the concave portion, and the reinforcing ring is fitted to the outer periphery of the clutch outer provided with the guide protrusion through the concave and convex engagement. To provide a clutch outer reinforcing ring retaining structure in a multi-disc friction clutch.

Therefore, an object of the present invention is to simplify the structure by forming a concave portion on either the clutch outer or the reinforcing ring and a convex portion on the other, and to reduce the unevenness. The engagement can reliably prevent the reinforcement ring from coming off from the clutch outer, simplifying the structure and improving the reliability of the retaining action. To provide a structure for preventing a reinforcing ring from slipping off of a clutch outer in a multi-disc friction clutch, which can effectively exhibit the reinforcing action of the reinforcing ring by maintaining the above-mentioned properties, and further improve the durability of the reinforcing ring.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows a power transmission device including a multi-disc friction clutch, and this device is used in automobiles and motorcycles.

Reference numeral 1 denotes a crankshaft of an internal combustion engine. A gear 2 is attached to the end of the crankshaft 1, and this gear is connected to a large diameter reduction gear 3 fixed to a closed end surface of a clutch outer 21 constituting a multi-disc friction clutch 20. Gear 2 is engaged.

The clutch outer 21 has a drum shape with an open right side surface, and a clutch inner 22 is installed inside the clutch outer 21.

The cylindrical outer peripheral portion 21a of the clutch outer 21 is provided with a guide protrusion 23 shown in FIG. 2 extending from the closed end surface to the open end surface.
are formed at equal intervals in the circumferential direction, and guide protrusions 23...
A guide groove 24 is provided between the clutch outer 21 and the outer circumferential base 25 of friction plates 25 arranged in the axial direction in the guide groove 24.
a is inserted and engaged.

Friction plates 26 on the clutch inner 22 side are interposed between the friction plates 25 on the clutch outer side. It is inserted into and engaged with a guide groove 27 which has the same shape as the clutch outer.

The friction plate 25 on the clutch outer 21 side is movable in the axial direction by the guide groove 24, and its position is restricted in the rotational direction by the guide protrusion 23, and rotates together with the clutch outer 21 only when it rotates.

The friction plate 26 on the clutch inner side 22 is also movable only in the axial direction by the guide groove 27, and its position is restricted in the rotational direction.

A pressure plate 4 is interposed between the clutch outer 21 and the clutch inner 22, and the pressure plate 4 has a cylindrical portion 4 projecting outward.
A plate member 6 is fixed to the pressure plate 4 with bolts 5 screwed into the cylindrical portion 4a.

A coil spring 7 is compressed between the plate member 6 and the clutch inner 22, and the plate member 6 is constantly urged to the right in the figure by the spring 7. The pressure plate 4 is given a force to move to the right, and therefore the pressure plate 4 moves all the friction plates 25 toward the end flange 22a side of the clutch inner 22.
, and 26... by moving and pressing the friction plates 25 and 2.
6 are pressed into frictional engagement contact.

As a result, the power from the crankshaft 1 is transmitted to the multi-disc friction clutch 20 via the gears 2 and 3, and then via the connected clutch outer 21 and clutch inner 22, to the hub member provided at the center of the clutch inner 22. The power is transmitted to a driven shaft 9 that is spline engaged with the transmission case 8, and is transmitted to the retransmission 10 by the driven shaft 9 that extends to the transmission case.

When the multi-plate friction clutch 20 is to be disconnected, the lever 11 connected to an operating member such as a clutch lever via a wire or the like is rotated.

By rotating the shaft 12 to which the lever 11 is fixed at one end, this shaft 12
A cam member 13 provided at the other end pushes the plate member 6 to the left in the figure against the coil spring 7.

As a result, the pressure plate 4 integrated with the plate member 6 slides leftward on the hub member 8, and the friction plates 25...
and 26..., and the multi-disc friction clutch 20 is disconnected.

A reinforcing ring 30 made of a plate spring material is fitted to the outer circumference 21a of the drum-shaped clutch outer 21, and the guide protrusions 23 are arranged in parallel in the circumferential direction on the outer circumference 21a.
This ring 25 compensates for the strength of... and prevents the guide protrusion 23 from expanding and deforming in the outer radial direction due to centrifugal force.

Figures 2 and 3 show the reinforcing ring 3 on the clutch outer 21.
In the embodiment, the inner and outer parts of the clutch outer 21 are fitted to the guide protrusions 23 a at appropriate locations among the guide protrusions 23 . A penetrating hole 31 is provided.

Several holes 31 are formed in the clutch outer 21.

After inserting the reinforcing ring 30, which has a diameter that matches the outer diameter of the clutch outer 21, into the outer circumference 21a of the clutch outer 21 provided with the guide protrusion 23, punch the portion of the ring 30 corresponding to the hole 31 with a punch or the like. Pressing is applied to obtain a protrusion 32 which projects inwardly in this portion as a small convex portion convex in the radial direction and engages with the hole 31 .

In this way, the clutch outer 21 and the reinforcing ring 30 engage with each other through the concave and convex portions formed by the hole 31 and the projection 32, thereby preventing the ring 30 from falling off from the clutch outer 21.

Furthermore, during high-speed rotation, if the guide protrusion 23 attempts to deform in a curved manner from the tip side, the hole 31 and the protrusion 32 will be slightly displaced in the radial direction, and therefore the reinforcing ring 30 will follow the deformation of the guide protrusion 23. The reinforcing ring 30
The outer peripheral surface of the reinforcing ring 30 always remains parallel to the axis of the clutch, allowing the reinforcing ring 30 to effectively exert its reinforcing action, and the reinforcing ring 30 does not undergo plastic deformation and has excellent durability.

FIG. 4 shows another embodiment, in which a protrusion 33 that bulges in the outer diameter direction is formed in advance on the guide protrusion 23 of the clutch outer 21.

A through hole 34 is formed in the reinforcing ring 30, and when the ring 30 is fitted to the clutch outer 21, the hole 34 is formed in the convex portion 33.
4, and the clutch outer 21 and the reinforcing ring 30 are engaged with each other through the convex portion 33 and the hole 34.

Even if the ring 30 has substantially the same diameter as the outer circumferential portion 21H of the clutch outer 21, the inward elastic deformation of the guide protrusion 23 allows this uneven engagement to be performed without any problem.

Although the concave-convex engagement has been described above with respect to the two embodiments, the concave-convex engagement can be carried out in any manner as long as it can reliably prevent the reinforcing ring from coming off.

As is clear from the above explanation, according to the present invention, when the reinforcing ring is fitted to the clutch outer, the reinforcing ring is engaged in the radial direction with projections and depressions, so that it is possible to reliably prevent the ring from coming off from the clutch outer. The structure is extremely simple, as it is only necessary to form a recess such as a hole on either the clutch outer or the ring, and a protrusion to engage with the recess on the other. In addition, the reinforcing ring has excellent durability, the reinforcing ring can be easily attached and removed during assembly, and this can be achieved without changing the basic structure of the multi-disc friction clutch. Demonstrate.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a power transmission device including a multi-disc friction clutch, Fig. 2 is a half-cut front view showing the clutch outer, Fig. 3 is a longitudinal sectional view of the same, and Fig. 4 is a concave-convex engagement showing another embodiment. FIG. In the drawings, 20 is a multi-plate friction clutch, 21 is a clutch outer, 21 a is a cylindrical outer circumference, 22 is a clutch inner, 23 is a guide protrusion, 24 is a guide groove, 25 and 26 are friction plates, and 30 is a reinforcement. ring, 31. 34 is a hole which is a concave portion, 32. 33 is a convex portion.

Claims (1)

[Scope of utility model registration request] The friction plate on the outer side of the clutch is connected by frictional engagement with the friction plate on the inner side of the clutch, and the friction plate on the clutch outer side can be moved only in the axial direction through the guide groove between the guide protrusions formed on the outer side. In a multi-plate friction clutch installed in a drum-shaped clutch outer guide protrusion,
One of the reinforcing rings to be fitted to the cylindrical outer peripheral part provided with the guide protrusion of the outer is formed with a small concave part in the radial direction, and the other part is formed with a small concave part in the radial direction. A reinforcing ring retaining structure for a clutch outer in a multi-disc friction clutch, characterized in that the reinforcing ring is formed with a small convex portion that is convex in the direction, and is fitted to the outer periphery of the clutch outer with a concave-convex engagement.