JPH05187497A - Friction type continuously variable transmission - Google Patents

Abstract

PURPOSE:To sufficiently execute the supply of a lubricant oil to a thrust bearing as present structure which is compact and has high widely using ability is followed. CONSTITUTION:Both piercingly protruding parts 6A, 6B on the supporting shaft 6 of a tapered cone 7 are supported by the first and second supporting plates 13, 14. A pin 15 to relatively fix the supporting plates 13, 14 is provided to compose a carrier 5 to revolvably support the tapered cone 7 in an autorotatable state. In addition, in CVT which is provided with a pressure regulating mechanism A to press the tapered cone 7 in the direction of an axial center, and has a supporting member 11 loosely fitted on a main shaft 3 between the supporting plates 13, 14 to catch pressing force sent from the mechanism A, the inclined face parts 22 of the first supporting plate 13 is provided with many press-punched parts 24 respectively having an oil supply hole 23 reaching an oil bath 25 on a lower part in a case.

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 suitable as a power transmission device for a work vehicle such as a binder and a cultivator.

[0002]

2. Description of the Related Art As a friction type continuously variable transmission of this type,
The thing shown by Unexamined-Japanese-Patent No. 3-177647 is known. That is, a plurality of taper cones that are revolved around the axis of the main shaft are arranged around the main shaft, and a shift member that is shiftable in the axial direction is brought into contact with the taper cones, and a spindle that penetrates the taper cone is provided. A support pin is provided to support both penetrating protrusions of the support shaft by separate first and second support plates, and a connecting pin is provided to fix these support plates to each other to form a carrier. Is rotatably supported in a freely rotatable state, and a pressure adjusting mechanism for pressing the taper cone in the axial direction of the main shaft is provided, and a supporting member for receiving the pressing force of this pressure adjusting mechanism via the taper cone is provided. There is known a friction type continuously variable transmission that is fitted onto a main shaft so as to be relatively rotatable between both support plates.

[0003]

The friction type continuously variable transmission is useful because it can be compactly constructed while having a relatively wide range of transmission width, and is excellent in versatility. However, it has been found that the structure has the following disadvantages. That is, the transmission has a lubricating structure in which lubricating oil is stored in a casing, and a rotating member such as a taper cone or a carrier scrapes the lubricating oil from an oil bath to scatter and supply the lubricating oil to each sliding portion. However, there is a thrust bearing (a bearing of reference numeral 17 in FIG. 1 of the above publication) provided at a position between the first support plate and the support member and receiving an axial force of the pressure adjusting mechanism. There was a tendency that it was difficult to supply the lubricating oil sufficiently, probably because the oil was clogged in a deep space and it was likely to be blocked. An object of the present invention is to improve the durability by sufficiently supplying the lubricating oil to the thrust bearing while keeping the current structure.

[0004]

In order to achieve the above object, the present invention arranges a plurality of taper cones around the main shaft, which are driven to revolve around the shaft center thereof, and to extend in the axial direction across the taper cones. A shift shaft capable of shifting is brought into contact with the shaft, a support shaft penetrating the tapered cone is provided, and both penetrating projections of the support shaft are supported by separate first and second support plates, and both support plates are supported. A carrier is formed by providing a connecting member that is relatively fixed, and a taper cone is rotatably supported on the carrier in a revolvable state, and a pressure adjusting mechanism that presses the taper cone in the axial direction of the main shaft is provided. In a friction type continuously variable transmission in which a supporting member that receives the pressing force of the pressure adjusting mechanism via a taper cone is fitted onto the main shaft so as to be relatively rotatable between both supporting plates, Of Jiban, the first support plate located on the opposite side of the support member relative to the pressure regulating mechanism exists side, is characterized in that is formed with feed holes for oil intake.

[0005]

Referring to FIG. 1, the rotation of the first support plate 13 accompanying the rotation of the carrier 5 causes the supply hole 23 to pass through the oil bath 25, so that the first support plate 13 and the support member 11 are separated from each other. Lubricating oil is reflected and scattered into the space S between them, and the scattered oil is supplied to the thrust bearing 17, and at the sliding portion 11a between the support member 11 and the tapered cone 7 by the action of centrifugal force. Will be supplied with lubricating oil. That is, since the supply hole 23 is formed in the first support plate 13 at a radius level reaching the oil bath 25, it is possible to positively supply the lubricating oil to the thrust bearing portion, which has been difficult to supply in the past. It has become possible.

[0006]

Therefore, by reexamining the supply form of the lubricating oil, a simple modification of forming the supply hole in the first support plate makes it economical while keeping the advantages of compactness and versatility. The durability of the thrust bearing that receives the axial force of the pressure regulating mechanism can be improved, and the durability of the entire transmission can be improved.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a transmission used in a walk-type cultivator, and a friction type continuously variable transmission for running on a camshaft or crankshaft 27 of an engine (not shown) mounted on the cultivator [C
ntinous Variabule Transm
issin (hereinafter abbreviated as CVT)] 1 is interlocked and connected. Next, the CVT 1 will be described. As shown in FIG. 1, a case C is provided with a main shaft 3 whose both ends are supported by ball bearings 2, 2 and 4 and also serves as an output shaft.
Of the carrier 5 integrally formed with the support 5, and the support portion 5a formed on the carrier 5 is provided with three taper cones 7 on which the support shafts 6 are engaged and supported. A disk-shaped rotating body 8 that contacts the radial side,
Also, each automatic pressure adjusting mechanism A for adjusting the contact pressure between the rotating body 8 and the taper cone 7 is provided coaxially with the main shaft 3, and
A ring-shaped speed change member 10 which is configured to be positionally adjustable along a rod 9 parallel to the axis P of the main shaft 3 and circumscribes each taper cone 7, and an annular shape formed on the small diameter side of each taper cone 7. Projecting edge 11a in contact with the recess 7a
CVT 1 is constructed by providing each of the supporting members 11 having the above-mentioned structure and supporting the idling support on the main shaft 3, and further providing the output part 12 at the end on the side opposite to the input part of the main shaft 3. Further, in this CVT 1, ball bearings 2, 2 are arranged between the carrier base 5A and the main shaft 3 at the portion where the central boss portion 5C serving as the input portion B is formed, and between the support member 11 and the main shaft 3. The needle bearing 16 and the thrust bearing 17 are interposed between the support member 11 and the collar 21, and the automatic pressure adjusting mechanism A slides along the axis P as shown in FIGS. 1 and 3. A transmission member 18 that is fitted around the main shaft 3 so as to be movable and torque-transmittable, and this transmission member 18
And a plurality of cam surfaces 18a formed on the rotary body 8 and a plurality of cam surfaces 8a formed on the sleeve portion 8s of the rotating body 8, and a coil spring 20 for setting an initial pressure. As the load of the automatic pressure adjusting mechanism A increases, the ball 19 rides on the cam surfaces 18a, 18a, so that the rotating body 8 is pressed against the tapered cone 7 more strongly.

As shown in FIG. 2, the carrier 5 comprises a carrier base 5A, a carrier boss 5C and a carrier body 5B. The carrier main body 5B includes plate-like first and second support plates (supporting portions) 13, 1 which are made of sheet metal and are provided with the vertically penetrating protrusions 6A, 6B of the support shaft 6 penetrating the taper cone 7.
4, both support plates 13 and 14 are relatively fixed with three pins (corresponding to a connecting member) 15, and the first support plate 13 is integrally bolted to the carrier base 5A. The carrier 5 that has been converted into a carrier is configured. The support shaft 6 rotatably supports the tapered cone 7 by means of needle bearings 22 and 22, and both ends thereof are formed into flat surfaces 26 so that the support shaft 6 comes into contact with the notched groove-shaped holding portion 5a formed by burring with a wide surface. I am doing it. And this C
In the VT1, when the transmission member 10 is slid while the power is transmitted to the central boss portion 5C of the carrier 5, the radius from the axis of rotation of the taper cone 7 at the position where the transmission member 10 contacts changes. That is, that is, since the circumferential length of the taper cone 7 changes at the position where the speed change member 10 contacts, when the carrier 5 is rotated by a unit amount, the taper cone that rotates following the inner surface of the speed change member 10 rotates. The amount of rotation of the rotating body 7 changes, and the rotating speed of the rotating body 8 to which the power is transmitted from the taper cone 7 changes with respect to the rotating speed of the carrier 5. As a result, the central boss 5C and the main shaft 3 coaxial with the center are formed. From this, the speed change power for traveling is taken out steplessly.

As shown in FIGS. 1 and 2, the first support plate 13
In the inclined surface portion, a large number of outer projections 24 having openings (corresponding to supply holes) 23 on the upstream side in the rotational direction are formed by punching with a press at equal intervals in the circumferential direction. The rotation of the carrier 5 causes the oil bath 25 below the case C.
When the outer protrusion 24 passes through the inside, the lubricating oil is taken in from the opening 23, and the taken lubricating oil is the first
The thrust bearing 17, the needle bearing 16, and the protruding edge portion 1 penetrate between the support plate 13 and the support member 11.
It is supplied to 1a. First and second support plates 13, 1
4 and the connecting member 15 may be integrally formed by casting parts, and the lubricating oil supply hole 23 may be integrally formed in a mold.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a sectional view showing the structure of a friction type continuously variable transmission.

FIG. 2 is an exploded perspective view showing a main structure of a carrier.

FIG. 3 is a sectional view showing a structure of an automatic pressure adjusting mechanism.

[Explanation of symbols]

 3 main shaft 5 carrier 6 support shaft 6A upper penetrating protrusion 6B lower penetrating protrusion 7 taper cone 10 speed change member 11 support member 13 first support portion 14 second support portion 15 connecting member 23 opening portion A pressure adjusting mechanism

Claims (1)

[Claims] 1. A plurality of taper cones (7), which are driven to revolve around the axis of the main shaft (3), are arranged around the main shaft (3), and the taper cones (7) extend in the axial direction. A support shaft (6) that contacts the shiftable speed change member (10) and penetrates the tapered cone (7).
Is provided, and both penetrating protrusions (6) on the support shaft (6) are provided.
A) and (6B) to the first and second support parts (13) and (1
4) and support both of these support parts (13), (1
4) is provided with a connecting member (15) for fixing them to each other to form a carrier (5), and the taper cone (7) is rotatably supported on the carrier (5) in a freely rotatable manner. The taper cone (7) is attached to the spindle (3)
A pressure adjusting mechanism (A) for pressing in the axial direction of the pressure adjusting mechanism (A) is provided, and a supporting member (11) that receives the pressing force of the pressure adjusting mechanism (A) via the taper cone (7) is provided on both support parts ( A friction-type continuously variable transmission externally fitted to the main shaft (3) so as to be relatively rotatable between 13) and (14), wherein the support member of the support parts (13) and (14) is included. A friction type continuously variable transmission in which a supply hole (23) for oil intake is formed in a first supporting portion (13) located on the opposite side of the pressure adjusting mechanism (A) from the (11) side. ..