JP2633353B2 - Friction type continuously variable transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is provided with a plurality of speed-change driving rotators driven and rotated by an input shaft around an input shaft, and the driving rotator is provided with an output driving rotator. The present invention relates to a friction type continuously variable transmission in which a driven rotating body is brought into contact with the driven rotating body so as to be shiftable in an axial direction thereof, and the driving rotating body is pressed toward the driven rotating body by a hydraulic mechanism.

[Conventional technology]

Conventionally, a bearing that supports a drive rotating body in the friction type continuously variable transmission is configured to be lubricated by transmission oil that is agitated and scattered by gears or the like in a casing of the transmission, and as an example. The one disclosed in Japanese Utility Model Laid-Open No. 56-131052 is known.

[Problems to be solved by the invention]

The drive rotating body in the friction type continuously variable transmission is configured to generate a contact force for transmitting power to the driven rotating body.
It is pressed in its axial direction by a hydraulic mechanism. In other words, the bearing portion of the drive rotating body must withstand not only the rotation but also the thrust load due to the pressing. However, the lubrication of the bearing which should function under the severe conditions is not accidentally sprayed by the scattering mission oil. Because of this, not only the durability of the bearing was easily varied depending on the product, but also the lubrication performance was liable to differ depending on the use conditions.

In addition, in order to ensure sufficient durability even when the durability is inferior, the abrasion resistance grade, which is disadvantageous in terms of cost, is set to be more excellent.

The present invention pays attention to the point that the means for pressing the drive rotating body is based on a hydraulic mechanism, so that the bearing that supports the drive rotating body is actively lubricated, so that the bearing can be stably lubricated. The purpose is to.

[Means for solving the problem]

Therefore, the present invention provides a plurality of speed-change driving rotators driven and rotated by the input shaft around the input shaft, and brings the driven rotator for output into contact with these driving rotators so as to be shiftable in the axial direction. In the friction-type continuously variable transmission in which the driving rotary body is pressed to the driven rotary body side by a hydraulic mechanism, a hydraulic chamber in the hydraulic mechanism is formed inside the driving rotary body, and the hydraulic chamber in the driving rotary body is Pressure oil supply oil passage is disposed in the vicinity of the contact surface of the driving rotating body with the driven rotating body, and a small-diameter passage for extracting the pressure oil communicating with the hydraulic chamber is provided, and the pressure oil flowing out from the small-diameter passage is driven. A small-diameter path is arranged so as to extend to a bearing that supports the rotating body. Of the shaft parts of the driving rotating body, the input part is provided on a shaft part that is arranged in a lower inclined position as the side closer to the input shaft. Power input from shaft It mounted integrally rotating state passive gears, on the opposite side to the hydraulic chamber for the passive gear the bearing, and wherein configuration that is disposed on the lower side of the bearing.

(Operation)

That is, since the pressure oil is always sent to the hydraulic chamber while the friction type continuously variable transmission is being driven, the oil blown out from the small-diameter path is always supplied to the bearing that supports the drive rotating body. . In other words, there is no longer any difference in the amount of lubricating oil sprinkled on bearings by products as in the past,
Sufficient lubricating oil can be delivered to structurally important bearings that support the drive rotor.

Also, since the pressure oil supply oil passage to the hydraulic chamber is located near the contact surface with the driven rotor and the hydraulic chamber is formed inside the drive rotor, the drive rotor contacts the driven rotor. The generated heat can be absorbed by the working oil that is discharged into the casing through the small-diameter path and circulates, so that the drive rotating body having severe thermal conditions can be efficiently cooled.

In addition, since the passive gear is disposed below the bearing, of the oil blown from the small-diameter path supplied to the bearing, the oil dripping from the bearing reaches the passive gear disposed below. Therefore, the oil discharged from the hydraulic chamber can be more effectively used as lubricating oil.

〔The invention's effect〕

Therefore, using a hydraulic device that presses the driving rotating body,
While being able to lubricate the bearings of the driving rotor sufficiently,
The gear transmission can also be lubricated to improve durability. In addition, it is possible to provide an economical and rational hydraulic frictionless continuously variable transmission, for example, by cooling the drive rotating body by improving the arrangement of the oil passage and improving the friction durability. .

〔Example〕

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

In FIG. 1, three tapered cones (2) as speed change driving rotators driven and rotated by the input shaft (1) are arranged at equal intervals around the input shaft (1). In 2), a driven ring (3) as an output driven rotating body is circumscribed so as to be shiftable in the direction of its rotation axis, and the rotation of the driven ring (3) is reduced by a planetary reduction mechanism (A) and taken out. Output shaft (4) to input shaft (1)
2 shows a friction type continuously variable transmission provided coaxially with FIG.

A casing (C) of the friction type continuously variable transmission has an input case (5) for bearing-supporting the input side of the input shaft (1), and a pump (B) interposed between the input case (5) and the input case (5). It comprises a support case (6) for supporting the tapered cone (2), a transmission case (7) connecting the support case (6) and covering most of the device, and a lid case (8).

The tapered cone (2) is a passive gear (12) in which the cone shaft (9) on the small diameter side of the cone is a plain bearing (10) and the cone shaft (11) on the large diameter side of the cone is splined onto the cone shaft (11). And is rotatably supported by a support case (6) by a ball bearing (13). The plain bearing (10) is mounted on the support case (6) via the flange member (14). As shown in FIG. 2, the flange member (14) supports the flange portion with bolts in the cone axis direction. While being connected to case (6),
The bearing (15) of the support case (6) that supports the small-diameter cone shaft (9) is moved from the bearing (15) by the radial movement of the small-diameter cone shaft (9). A cut-out opening (16) is formed to allow escape.

The passive gear (12) has a ball bearing (1
3) The hydraulic piston (1
7) is externally fitted, and the outer periphery of the piston (17) is closely fitted to the inner peripheral surface of the tapered cone (2).
A hydraulic mechanism (D) is formed by forming a hydraulic chamber (18) partitioned by a piston (17) and a passive gear (12) inside the taper cone (2). The pump (B) is fed to the hydraulic chamber (18) through an oil passage (19) formed inside each of the tapered cone (2), the plain bearing (10), the flange member (14), and the support case wall (6a). ), That is, the taper cone (2) is pressed to its small diameter side by hydraulic pressure.

As shown in FIG. 1, the piston (17) of the hydraulic mechanism (D) communicates with a hydraulic chamber (18) formed inside the tapered cone (2), and the piston (17) of the ball bearing (13) in an adjacent state. A small through-hole (31) is formed as a small-diameter passage for taking out the pressure oil toward the ball portion, and the ball bearing (1) is formed by the pressure oil squirted from the small hole (31).
The lubrication of 3) is performed.

The oil passage (19) formed in the support case (6) and the hydraulic chamber (18) are communicated by a pressure oil supply oil passage (41) formed inside the tapered cone (2). Road (41)
Is disposed near the contact surface (2a) of the tapered cone (2) with the driven ring (3).

That is, a passive gear (equivalent to a passive gear) (12) that meshes with the drive gear (40) of the input shaft (1) is disposed below the ball bearing (13) on the opposite side of the hydraulic chamber (18). The pressure oil spouted from the small hole (31) can reach the passive gear (12) via the bearing (13).

Further, the plain bearing (10) also forms the oil passage (19) so that the pressure oil from the pump (B) permeates into the sliding surface.

Incidentally, (32) is a spring for pre-pressing the tapered cone (2) to the small diameter side.

As shown in FIGS. 1 and 2, the pump (B) is an internal gear pump, and is internally connected to an input shaft (1) by a key and driven to rotate. ) Is enclosed by a support case (6) and a partition member (22) sandwiched between the support case (6) and the input case (5). In order to guide the lubricating oil in the casing (C) and the discharge port (23) arranged in the space and communicating with all three oil passages (19) radially provided in the support case (6). And a suction port (25) communicating with a suction oil passage (24) formed in the support case (6) is disposed opposite to the left and right sides of the pump (B).

As shown in FIG. 1, the tapered cone (2) is rotationally driven by the engagement between the passive gear (12) and the drive gear (40) splined to the input shaft (1), and the planetary reduction mechanism (A). A driven ring (3) circumscribing the tapered cone (2) is supported on a slide pin (27) fixed to the ring gear (26) in (1), and the driven ring (3) is connected to the axis of the slide pin (27). Shift member in direction (2
The speed of the ring gear (26) can be continuously changed by shifting in step (8). Then, a sun gear (29) is splined on the input shaft (1), and a flanged cylindrical output shaft (30) that supports a planetary gear (30) that meshes with both the sun gear (29) and the ring gear (26). 4)
Is supported on the lid case (8) by bearings.

The ring gear (26) is bearing-supported with respect to the sun gear (29), and the opposite input side of the input shaft (1) is bearing-supported to the lid case (8) via the output shaft (4). is there.

The opening (7a) of the transmission case (7), which is to be joined to the lid case (8), is provided in the support case (6) in which the tapered cone (2) including the flange member (4) is pre-assembled. Is large enough to pass through.

Next, the power transmission action of the friction type continuously variable transmission will be described. When the input shaft (1) is driven by an engine or the like, the taper cone (2) and the sun gear (29) rotate and the pump (B) also rotates. As a result, the tapered cone (2) is pressed toward its smaller diameter side, and the circumscribing ring gear (26) is rotated by contact friction. This rotation is transmitted to the output shaft via the planetary reduction mechanism (A). (4).

(Another embodiment)

According to the present invention, the driven rotating body (3) is
The present invention may be applied to a friction-type continuously variable transmission of a type inscribed in a motor or a type in which a drive rotating body is a disk type.

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 a friction type continuously variable transmission according to the present invention, wherein FIG. 1 is a sectional side view of the whole, and FIG. 2 is a sectional front view. (1) Input shaft, (2) Drive rotating body, (2a)
Contact surface, (3): driven rotating body, (11): shaft part,
(12) ... passive gear, (13) ... bearing, (18) ...
... Hydraulic chamber, (41) ... Hydraulic oil supply passage.

Claims (1)

(57) [Claims] 1. A plurality of speed change driving rotators (2) driven and rotated by the input shaft (1) are provided around an input shaft (1), and output driving rotators (2) are provided on these driving rotators (2). The driven rotating body (3) is brought into contact with the driven rotating body (3) so as to be shiftable in the axial direction, and the driving rotating body (2) is pressed toward the driven rotating body (3) by a hydraulic mechanism (D). A step transmission, wherein a hydraulic chamber (18) in the hydraulic mechanism (D) is formed inside the driving rotator (2), and a hydraulic chamber (18) in the driving rotator (2) is connected to the hydraulic chamber (18). Pressurized oil supply passage (41)
A small-diameter path (3) for extracting hydraulic oil, which is disposed near a contact surface (2a) of the driving rotary body (2) with the driven rotary body (3) and communicates with the hydraulic chamber (18).
1), the small-diameter path (31) is arranged so that the pressure oil flowing out from the small-diameter path (31) reaches a bearing (13) that supports the driving rotator (2). Power is input from the input shaft (1) to the shaft portion (11) of the shaft portion (11), which is arranged in an inclined posture that becomes lower as it approaches the input shaft (1). The passive gear (12) is mounted so as to rotate integrally, and the passive gear (12) is arranged on the opposite side of the hydraulic chamber (18) with respect to the bearing (13) and below the bearing (13). Friction type continuously variable transmission.