JP2731653B2 - Friction type continuously variable transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction type continuously variable transmission [Continuous VariableTrans].
More specifically, the present invention relates to rationalization as a device.

[0002]

2. Description of the Related Art A conventional CVT is disclosed in Japanese Unexamined Patent Publication No. 3-17883.
No. 3 is known. That is, the casing is composed of a first case that inputs the engine output to a carrier that supports the tapered cone and supports the main shaft as an output shaft and a second case that supports and supports the carrier. The structure adopts a structure in which the transmission member can be freely shifted.

[0003]

The CVT has the advantage that a continuously variable transmission can be constructed relatively inexpensively and relatively inexpensively, and in recent years, plans for using it for various working machines and agricultural machines have been increasing. In particular, the use planning in small model such single blade type riding lawn mower and a binder is realistic, when adopted in those small model, narrow spaces
In view of the fact that the CVT must be installed in a computer and the versatility, it is advantageous to make the CVT compact at least.
An object of the present invention is to achieve further compactness by reviewing the structure of the above-mentioned conventional CVT once again.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, according to the present invention, a plurality of driving rotating bodies which are driven to revolve around an axis of the main shaft around the main shaft are arranged in the axial direction. A first case for bringing a shiftable shift member and an output rotary body for taking out a shift output into contact with a plurality of drive rotary bodies, supporting the shift member so as to be shiftable, and rotatably supporting the main shaft; , Is fitted to the main shaft so as to be relatively rotatable,
Further, the CVT is characterized in that the CVT is configured to be rotatably fitted to a second case that rotatably supports the driving rotating body.

[0005]

In other words, the transmission member, which has been conventionally installed and supported over both cases of the left-right split structure, is supported only by the first case, which is one of the cases, so that the transmission member in the second case is provided. Can be omitted, so that the carrier part supporting the driving rotary body also functions as the other case, that is, the second case, and the first and second cases are relatively rotatably fitted to each other. By doing so, a casing that houses each component is configured. In the CVT having this configuration, an input rotation intake unit is provided for three elements of the first case, the second case, and the spindle.
The three functions of the output rotation take-out part and the fixed part of the device are distributed, namely: fixed: first case input: second case output: main shaft fixed: first case input: main shaft output: second case fixed: main shaft Input: 2nd case Output: 1st case Three usage patterns can be considered. This is because the casing is always fixed.
Compared with T, the degree of freedom of actual mounting on a working machine or an agricultural machine is increased, and it is possible to contribute to expansion of versatility. Also,
In either use mode, the first or second case functions as a rotating member that is a power transmission means, such as by hanging a belt on the case itself.
Shaft protruding from case compared to (for input or output)
Need not be provided, and the axial width can be reduced.

[0006]

As a result, a CVT having advantages over the prior art, such as a compact device width and excellent versatility in design, can be provided by using a rotating case of the split case by rational review of the structure. Was.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a CVT according to the present invention. In this CVT, a plurality of taper cones (corresponding to a driving rotating body) 2 that are driven to revolve around a main shaft 1 around an axis P of the main shaft 1 are arranged, and a transmission member 3 that can shift in the axial direction is provided. An output rotator 4 for taking out a shift output is circumscribed to a plurality of tapered cones 2, and these members are housed in a casing A composed of a fixed case 5 and a rotating case 6. The fixed case 5 has a hollow cylindrical portion 5a that supports the main shaft 1 as a bearing, and a flange portion 5b for bolt connection to a transmission (not shown). Case 6a for bearing the front end of the shaft, and three rows of input pulleys 7
Are formed in a shape having a cover case portion 6b formed with a cover. A spindle 8 that supports the tapered cone 2 so that it can rotate freely.
Is supported by a carrier 9 having an outer supporting portion 9a and an inner supporting portion 9b that protrude from the inner wall of the rotating case 6, and the carrier 9 is bolted to the inner wall of the rotating case 6. Reference numeral 10 denotes a supporting rotating body that receives and supports the tapered cone 2, 11 denotes a pressing mechanism that presses the tapered cone 2, and the pressing mechanism 11 includes a rotating disk (corresponding to an output rotating body) 4 that contacts the tapered cone 2 and the main shaft 1. It is configured as a ball cam type with a receiving disk 11B and a ball 11A to be spline-fitted.

[0008] The shifter 13 comprises a cylindrical portion 5 of the fixed case 5.
a, a fitting portion 13b fitted inside the open end of the rotating case 6 via a seal 14, and a disc portion 13c connecting the whole circumference supporting portion 13a and the fitting portion 13b. Formed into a rotating body shape composed of
The ring-shaped transmission member 3 is attached to the tip of the fitting portion 13b with a plurality of screws 12. The circumference support portion 13a and the cylindrical portion 5a are stopped from rotating by the key 16,
The shifting member 3 is shifted on the taper cone 2 by the sliding operation with the shift fork 15.
In this CVT, power is input to an input pulley 7 of a rotating case 6 to revolve the tapered cone 2 around the main shaft 1,
The transmission member 3 which is a stationary member supported by the stationary case 5
As a result, the tapered cone 2 rotates on its own axis, and the output rotation thereof is taken out by the main shaft 1 via the pressing mechanism 11.
The above-described embodiment corresponds to the use mode described in the section of [Action]. In the use mode and the like, the output rotary body for extracting the shift output is a part different from the rotary disk 4. For convenience, in the claims, it is defined as "output rotator (4)".

[Another Embodiment] As shown in FIG. 2, a rotary case 6 supports the front end side of the main shaft 1 as a bearing, and surrounds an input case portion 6a in which three rows of input pulleys 7 are formed, and a tapered cone 2. While being formed in a shape having the cover case portion 6b,
A structure in which the flywheel 17 of the engine E is directly connected to the rotating case 6 may be used. In this case, the input pulley 7 can be used as a power take-out unit for other devices.

[0010] In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the attached drawings by the entry.

[Brief description of the drawings]

FIG. 1 is a sectional view showing the structure of a CVT.

FIG. 2 is a sectional view showing the structure of a CVT according to a second case having another structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main shaft 2 Drive rotary body 4 Output rotary body 3 Transmission member 5 1st case 6 2nd case

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-60-129641 (JP, A) JP-A-3-181646 (JP, A) JP-A-4-125347 (JP, A) 153828 (JP, U) Hikaru 4-3152 (JP, U)

Claims (1)

(57) [Claims] A plurality of driving rotating bodies (2) revolving around a main shaft (1) around the axis of the main shaft (1).
And a transmission member (3) that can be shifted in the axial direction,
An output rotating body (4) for taking out a shifting output is brought into contact with the plurality of driving rotating bodies (2), the shifting member (3) is supported so as to be shiftable, and the main shaft (1) is rotated.
And a second case (6) rotatably supporting the main shaft (1) and rotatably supporting the driving rotary body (2). Is a friction-type continuously variable transmission that is rotatably fitted to the transmission.