JP2698194B2 - Friction type continuously variable transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention provides a plurality of tapered cone-shaped driving rotators that are driven by the main shaft to revolve around a main shaft. The present invention relates to a frictionless continuously variable transmission in which a transmission member that can shift in the axial direction is in contact with the transmission.

[Conventional technology]

Conventionally, in the above-described friction-type continuously variable transmission, a carrier that supports the driving rotating body so that it can rotate and revolve is, for example,
As disclosed in Japanese Patent Application Laid-Open No. 61-24871, it was made of a casting material such as cast iron.

[Problems to be solved by the invention]

According to the above prior art, the carrier that rotates about the main shaft is made of a cast material, so that it is heavy, which makes it difficult to handle at the time of assembly and the like, and is expensive.

SUMMARY OF THE INVENTION An object of the present invention is to rationalize a frictionless continuously variable transmission by constructing a carrier that supports a driving rotary member lightly and inexpensively by a structural device.

[Means for solving the problem]

In order to achieve the above object, the present invention provides a
A plurality of tapered cone-shaped driving rotators that can revolve around the axis of the main shaft are arranged, and a transmission member that can shift in the axial direction over these driving rotators, and a large-diameter side of the driving rotator. A rotating body for output that contacts and applies a pressing force;
While contacting the small diameter side of the driving rotator and contacting the supporting member that receives and supports the pressing force of the rotator, the driving rotator transmits the revolving driving force via a support shaft penetrating therethrough, In addition, a carrier for rotatably supporting the driving rotary body is provided, and the carrier is spanned over a plate-shaped support made of sheet metal for separately supporting the through projections at both ends of the support shaft. It is composed of a connecting member, and both support portions and both penetrating protrusions prevent relative movement in the circumferential direction of the main shaft, and
The projecting edge of the support member is mechanically engaged by a swingable flexible connection structure as a fulcrum, and the connection member and both support portions are connected in a state that regulates the relative movement of both support portions. And a friction type continuously variable transmission.

(Operation)

According to the above configuration, the posture of the drive rotating body and the position with respect to the main shaft are held by the three members of the transmission member, the rotating body, and the support member, and a state in which the drive rotating body can be rotationally driven with good balance appears. ing. Therefore, the carrier only needs to have the function of transmitting the revolving power and the function of allowing the driving rotator to move in the very small radial direction by pressing the rotator. The function of freely revolving and rotating, that is, supporting the fixed position is not required.

Therefore, as shown in FIG. 2, for example, a notch-shaped holding portion (5a) formed at the outer diameter end of the plate-shaped supporting portions (13) and (14) made of sheet metal and a support shaft ( 6), the carrier and the support shaft need only be mechanically engaged, and the structure at that portion can be simplified.

That is, since the support portion does not need a function of supporting the support shaft in a fixed position, the required strength and rigidity can be reduced as compared with the above-described conventional carrier.
It is possible to configure the carrier using a sheet metal material that is likely to be disadvantageous in strength and rigidity as compared with a cast product.
In addition, the use of sheet metal does not require the formation of a thick-walled portion or a rib-exposed portion unlike the case of casting, so that the weight can be reduced.

By the way, as described above, a structure in which the driving rotary body is supported by three members, that is, a three-point supporting structure, is disclosed in Japanese Utility Model Publication No. Sho 61-28.
There is one disclosed in Japanese Patent Publication No. 122,122, which has an input disk, an output disk, and a speed change ring in contact with a driving rotating body. However, in this structure, power is transmitted by friction among all three members, and a function of transmitting power while receiving a strong pressing force generated in the input / output disk on a relatively large surface is required. . For this reason, there has been a technical restriction that it must be made of a casting that can easily secure the strength and rigidity.

On the other hand, in the case of the present application, the three members that receive and support the pressing force for frictional contact and the member that revolves the driving rotary body, that is, the carrier, are divided into different members. Thus, as described above, the carrier is simply transmitted with the function of transmitting the revolving power, that is, the movement in the circumferential direction of the carrier, which is independent of the pressing contact for frictional transmission with the cone-shaped driving rotary body, is transmitted. Anything could be done better, and there is a unique ingenuity in this regard that makes it possible to realize a sheet metal carrier.

〔The invention's effect〕

As a result, the drive rotary body can be revolved and automatically freely and stably supported by three-point support to stably support the drive rotary body and to provide the carrier with only a transmission function to revolve the drive rotary body. While having the function to
Since the carrier was made of sheet metal, which was inexpensive compared to casting, the weight and cost could be reduced as compared with conventional carriers, and the friction type continuously variable transmission could be rationalized.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

As shown in FIG. 1, a case (1) is provided with a main shaft (3) serving as an output shaft supported at both ends via bearings (2), (2) and (4). A carrier (5) in which an input portion (5c) is integrally formed with the main shaft (3) is idlely supported, and the support shaft (6) is supported on a holding portion (5a) formed in the carrier (5). ) Is provided with three tapered cones (7) that are engaged and supported, and a disk-shaped rotating body (8) that contacts the large-diameter side of the tapered cones (7);
An automatic pressure adjusting mechanism (A) for adjusting the contact pressure between the rotating body (8) and the taper cone (7) is provided on the same axis as the main shaft (3). ) Is formed along the rod (9) parallel to the ring, and is formed on the small-diameter side of each of the ring-shaped transmission member (10) and the tapered cone (7) that comes into contact with the respective tapered cones (7). Having a protruding edge (11a) in contact with the formed annular recess (7a),
In addition, the main shaft (3) is provided with support members (11) for free rotation, and furthermore, the main shaft (3) is provided with an output portion (32) at the end opposite to the input portion (5C) to provide a frictionless stepless transmission. The device is configured.

Further, in this transmission, ball bearings (2) and (2) are arranged between the carrier base (5A) where the input portion (5C) is formed and the main shaft (3), and the support member (11) A needle bearing (16) and a thrust bearing (17) are arranged between the main shaft (3) and between the support member (11) and the carrier (5), respectively. First
As shown in FIG. 5 and FIG. 5, a transmission member (18) which is slidably movable along the axis (P) and which is fitted to the main shaft (3) so as to be capable of transmitting torque, and the transmission member (18). ), A ball (19) sandwiched between a plurality of cam surfaces (8a) formed on a sleeve portion (8s) of the rotating body (8), and an initial pressure setting. This automatic pressure adjusting mechanism (A) is provided with a ball (19) having a cam surface (18a), (8) as the load increases.
As a result of riding on a), the rotating body (8) is more strongly pressed against the tapered cone (7).

As shown in FIG. 2, the carrier (5) comprises a carrier base (5A) and a carrier body (5B).

The carrier body (5B) is a vertically extending protrusion (6A), (6B) of the support shaft (6) penetrating the taper cone (7).
The first and second plate-shaped first and second support portions (13) made of different sheet metals,
(14), and both support parts (13), (1)
4) is relatively fixed with three pins [an example of a connecting member] (15), and the first support portion (13) is bolted to the carrier base (5A) to integrate the carrier (5). ).

The support shaft (6) rotatably supports the tapered cone (7) with needle bearings (27), (27), and both ends thereof are formed on a flat surface (21) as shown in FIG. The holding portion (5a), which is a notch groove shaped to fit into the flat surface (21) by processing, is brought into contact with a wide surface.

In other words, both support parts (13), (14) and both penetrating projections (6
A) and (6B) are to prevent relative movement of the main shaft (3) in the circumferential direction, and to protrude the edge (11a) of the support member (11).
Is mechanically engaged by a swingable flexible connecting structure with the pin as a fulcrum, and the pin (15) and both support portions (13),
(14) means that the support portions (13) and (14) are relatively connected to each other in such a manner that relative axial movement of the main shaft (3) is prevented.

In this transmission, when the transmission member (10) is operated in the transmission operation range (S) in a state where power is transmitted to the input portion (5C) of the carrier (5), the transmission member (10) Cone (7) at the position where it contacts
Of the carrier (5) because the radius of the taper cone (7) at the position where the transmission member (10) comes into contact changes because the radius of the carrier (5) changes.
When the unit is rotated by a unit amount, the speed change member (10)
The amount of rotation of the tapered cone (7) rotating following the inner surface of the roller changes, and the rotation speed of the rotating body (8) to which power is transmitted from the tapered cone (7) is smaller than the rotation speed of the carrier (5). As a result, the speed-changed power is extracted from the input portion (5C) and the main shaft (3) having the trunk axis.

Further, in this transmission, as shown in FIG. 3, the contact pressure of the rotating body (8) with respect to the tapered cone (7) is reduced by (F
1) When the contact pressure of the speed change member (10) with respect to the taper cone (7) is determined as (F2), the contact position of the support member (11) with respect to the taper cone (7) is determined by two contact pressures (F1), Since the moment acting on the taper cone (7) due to (F2) is set at a position where the moment can be canceled, the contact pressure of the support member (11) with respect to the taper cone (7) is determined as (F3). When the holding part (5a) is determined as the center, F1 × 11 + F3 × 13−F2 × 12 = 0 holds and the moment balance is maintained, and the vectors (F1), (F2), and (F3) are respectively obtained. Will be closed as shown in FIG.

Incidentally, in this transmission, the projecting edge (11a) of the support member (11) is fitted into the annular concave portion (7a) of the tapered cone (7). At the same time as the posture of (7) slightly changes, the pressing direction of the protruding edge (11a) against the annular concave portion (7a) changes in the direction in which the moment is balanced, and reaches a stable state in a very short time. Even when the contact pressure between the rotating body (8) and the taper cone (7) changes, such as when the load changes, a pressure proportional to this contact pressure acts on the taper cone (7) from the support member (11). Therefore, the balanced state of the moment is maintained.

(Another embodiment)

As shown in FIG. 6, the first support portion (13) and the carrier base portion (5A) are spline-fitted, and the retaining ring (22)
The first support portion (13) and the second support portion (14) may be bolted (24) as shown in FIG. Rigid body connection may be performed by a connecting member (15) including a spacer (25) and a nut (26).

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the structure shown in the attached drawings.

[Brief description of the drawings]

The drawings show an embodiment of the friction type continuously variable transmission according to the present invention. FIG. 1 is a sectional view of the device, FIG. 2 is an exploded perspective view of a carrier, and FIG. 3 shows a force acting on a taper cone. ,
FIG. 4 is a view showing a vector, FIG. 5 is a sectional view showing a structure of an automatic pressure adjusting mechanism, and FIGS. 6 and 7 are sectional views of a main part showing another embodiment of the carrier. (3) ... spindle, (5) ... carrier, (6) ... spindle, (7) ... drive rotating body, (8) ... rotating body, (10)
... Transmission member, (11) ... Support member, (13), (14)
... Supporting part, (15) ... Connecting member, (6A), (6B) ...

Claims (1)

(57) [Claims] 1. A plurality of tapered cone-shaped driving rotators (7) capable of revolving around the axis of the main shaft (3) are arranged around the main shaft (3). A transmission member (10) that can shift in the axial direction, an output rotator (8) that contacts the large-diameter side of the drive rotator (7) and applies a pressing force;
A support member (11) that contacts the small diameter side of the driving rotator (7) to receive and support the pressing force of the rotator (8);
And a carrier that transmits a revolving driving force to the driving rotating body (7) via a support shaft (6) penetrating the driving rotating body (7), and supports the driving rotating body (7) in a freely rotatable manner. (5), wherein the carrier (5) is provided with a plate-shaped supporting part (13), (14) made of a sheet metal for separately supporting the through projections (6A) and (6B) at both ends of the support shaft (6). ) And a connecting member (15) spanned over the two support portions (13) and (14), and the two support portions (13) and (14) and the two through projection portions (6).
A) and (6B) are to prevent the relative movement of the main shaft (3) in the circumferential direction and to prevent the protruding edge (11) of the support member (11).
While being mechanically engaged by a flexible connecting structure that can swing around a) as a fulcrum, the connecting member (15) and the support portions (13), (14) are connected to the support portion (13). , (14) a frictionless continuously variable transmission connected to regulate the relative movement.